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path: root/src/3rdparty/pcre2/src/pcre2_compile.c
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/*************************************************
*      Perl-Compatible Regular Expressions       *
*************************************************/

/* PCRE is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.

                       Written by Philip Hazel
     Original API code Copyright (c) 1997-2012 University of Cambridge
          New API code Copyright (c) 2016-2019 University of Cambridge

-----------------------------------------------------------------------------
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

    * Neither the name of the University of Cambridge nor the names of its
      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------------
*/


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#define NLBLOCK cb             /* Block containing newline information */
#define PSSTART start_pattern  /* Field containing processed string start */
#define PSEND   end_pattern    /* Field containing processed string end */

#include "pcre2_internal.h"

/* In rare error cases debugging might require calling pcre2_printint(). */

#if 0
#ifdef EBCDIC
#define PRINTABLE(c) ((c) >= 64 && (c) < 255)
#else
#define PRINTABLE(c) ((c) >= 32 && (c) < 127)
#endif
#include "pcre2_printint.c"
#define DEBUG_CALL_PRINTINT
#endif

/* Other debugging code can be enabled by these defines. */

/* #define DEBUG_SHOW_CAPTURES */
/* #define DEBUG_SHOW_PARSED */

/* There are a few things that vary with different code unit sizes. Handle them
by defining macros in order to minimize #if usage. */

#if PCRE2_CODE_UNIT_WIDTH == 8
#define STRING_UTFn_RIGHTPAR     STRING_UTF8_RIGHTPAR, 5
#define XDIGIT(c)                xdigitab[c]

#else  /* Either 16-bit or 32-bit */
#define XDIGIT(c)                (MAX_255(c)? xdigitab[c] : 0xff)

#if PCRE2_CODE_UNIT_WIDTH == 16
#define STRING_UTFn_RIGHTPAR     STRING_UTF16_RIGHTPAR, 6

#else  /* 32-bit */
#define STRING_UTFn_RIGHTPAR     STRING_UTF32_RIGHTPAR, 6
#endif
#endif

/* Macros to store and retrieve a PCRE2_SIZE value in the parsed pattern, which
consists of uint32_t elements. Assume that if uint32_t can't hold it, two of
them will be able to (i.e. assume a 64-bit world). */

#if PCRE2_SIZE_MAX <= UINT32_MAX
#define PUTOFFSET(s,p) *p++ = s
#define GETOFFSET(s,p) s = *p++
#define GETPLUSOFFSET(s,p) s = *(++p)
#define READPLUSOFFSET(s,p) s = p[1]
#define SKIPOFFSET(p) p++
#define SIZEOFFSET 1
#else
#define PUTOFFSET(s,p) \
  { *p++ = (uint32_t)(s >> 32); *p++ = (uint32_t)(s & 0xffffffff); }
#define GETOFFSET(s,p) \
  { s = ((PCRE2_SIZE)p[0] << 32) | (PCRE2_SIZE)p[1]; p += 2; }
#define GETPLUSOFFSET(s,p) \
  { s = ((PCRE2_SIZE)p[1] << 32) | (PCRE2_SIZE)p[2]; p += 2; }
#define READPLUSOFFSET(s,p) \
  { s = ((PCRE2_SIZE)p[1] << 32) | (PCRE2_SIZE)p[2]; }
#define SKIPOFFSET(p) p += 2
#define SIZEOFFSET 2
#endif

/* Macros for manipulating elements of the parsed pattern vector. */

#define META_CODE(x)   (x & 0xffff0000u)
#define META_DATA(x)   (x & 0x0000ffffu)
#define META_DIFF(x,y) ((x-y)>>16)

/* Function definitions to allow mutual recursion */

#ifdef SUPPORT_UNICODE
static unsigned int
  add_list_to_class_internal(uint8_t *, PCRE2_UCHAR **, uint32_t,
    compile_block *, const uint32_t *, unsigned int);
#endif

static int
  compile_regex(uint32_t, PCRE2_UCHAR **, uint32_t **, int *, uint32_t,
    uint32_t *, int32_t *, uint32_t *, int32_t *, branch_chain *,
    compile_block *, PCRE2_SIZE *);

static int
  get_branchlength(uint32_t **, int *, int *, parsed_recurse_check *,
    compile_block *);

static BOOL
  set_lookbehind_lengths(uint32_t **, int *, int *, parsed_recurse_check *,
    compile_block *);

static int
  check_lookbehinds(uint32_t *, uint32_t **, parsed_recurse_check *,
    compile_block *);


/*************************************************
*      Code parameters and static tables         *
*************************************************/

#define MAX_GROUP_NUMBER   65535u
#define MAX_REPEAT_COUNT   65535u
#define REPEAT_UNLIMITED   (MAX_REPEAT_COUNT+1)

/* COMPILE_WORK_SIZE specifies the size of stack workspace, which is used in
different ways in the different pattern scans. The parsing and group-
identifying pre-scan uses it to handle nesting, and needs it to be 16-bit
aligned for this. Having defined the size in code units, we set up
C16_WORK_SIZE as the number of elements in the 16-bit vector.

During the first compiling phase, when determining how much memory is required,
the regex is partly compiled into this space, but the compiled parts are
discarded as soon as they can be, so that hopefully there will never be an
overrun. The code does, however, check for an overrun, which can occur for
pathological patterns. The size of the workspace depends on LINK_SIZE because
the length of compiled items varies with this.

In the real compile phase, this workspace is not currently used. */

#define COMPILE_WORK_SIZE (3000*LINK_SIZE)   /* Size in code units */

#define C16_WORK_SIZE \
  ((COMPILE_WORK_SIZE * sizeof(PCRE2_UCHAR))/sizeof(uint16_t))

/* A uint32_t vector is used for caching information about the size of
capturing groups, to improve performance. A default is created on the stack of
this size. */

#define GROUPINFO_DEFAULT_SIZE 256

/* The overrun tests check for a slightly smaller size so that they detect the
overrun before it actually does run off the end of the data block. */

#define WORK_SIZE_SAFETY_MARGIN (100)

/* This value determines the size of the initial vector that is used for
remembering named groups during the pre-compile. It is allocated on the stack,
but if it is too small, it is expanded, in a similar way to the workspace. The
value is the number of slots in the list. */

#define NAMED_GROUP_LIST_SIZE  20

/* The pre-compiling pass over the pattern creates a parsed pattern in a vector
of uint32_t. For short patterns this lives on the stack, with this size. Heap
memory is used for longer patterns. */

#define PARSED_PATTERN_DEFAULT_SIZE 1024

/* Maximum length value to check against when making sure that the variable
that holds the compiled pattern length does not overflow. We make it a bit less
than INT_MAX to allow for adding in group terminating code units, so that we
don't have to check them every time. */

#define OFLOW_MAX (INT_MAX - 20)

/* Code values for parsed patterns, which are stored in a vector of 32-bit
unsigned ints. Values less than META_END are literal data values. The coding
for identifying the item is in the top 16-bits, leaving 16 bits for the
additional data that some of them need. The META_CODE, META_DATA, and META_DIFF
macros are used to manipulate parsed pattern elements.

NOTE: When these definitions are changed, the table of extra lengths for each
code (meta_extra_lengths, just below) must be updated to remain in step. */

#define META_END              0x80000000u  /* End of pattern */

#define META_ALT              0x80010000u  /* alternation */
#define META_ATOMIC           0x80020000u  /* atomic group */
#define META_BACKREF          0x80030000u  /* Back ref */
#define META_BACKREF_BYNAME   0x80040000u  /* \k'name' */
#define META_BIGVALUE         0x80050000u  /* Next is a literal > META_END */
#define META_CALLOUT_NUMBER   0x80060000u  /* (?C with numerical argument */
#define META_CALLOUT_STRING   0x80070000u  /* (?C with string argument */
#define META_CAPTURE          0x80080000u  /* Capturing parenthesis */
#define META_CIRCUMFLEX       0x80090000u  /* ^ metacharacter */
#define META_CLASS            0x800a0000u  /* start non-empty class */
#define META_CLASS_EMPTY      0x800b0000u  /* empty class */
#define META_CLASS_EMPTY_NOT  0x800c0000u  /* negative empty class */
#define META_CLASS_END        0x800d0000u  /* end of non-empty class */
#define META_CLASS_NOT        0x800e0000u  /* start non-empty negative class */
#define META_COND_ASSERT      0x800f0000u  /* (?(?assertion)... */
#define META_COND_DEFINE      0x80100000u  /* (?(DEFINE)... */
#define META_COND_NAME        0x80110000u  /* (?(<name>)... */
#define META_COND_NUMBER      0x80120000u  /* (?(digits)... */
#define META_COND_RNAME       0x80130000u  /* (?(R&name)... */
#define META_COND_RNUMBER     0x80140000u  /* (?(Rdigits)... */
#define META_COND_VERSION     0x80150000u  /* (?(VERSION<op>x.y)... */
#define META_DOLLAR           0x80160000u  /* $ metacharacter */
#define META_DOT              0x80170000u  /* . metacharacter */
#define META_ESCAPE           0x80180000u  /* \d and friends */
#define META_KET              0x80190000u  /* closing parenthesis */
#define META_NOCAPTURE        0x801a0000u  /* no capture parens */
#define META_OPTIONS          0x801b0000u  /* (?i) and friends */
#define META_POSIX            0x801c0000u  /* POSIX class item */
#define META_POSIX_NEG        0x801d0000u  /* negative POSIX class item */
#define META_RANGE_ESCAPED    0x801e0000u  /* range with at least one escape */
#define META_RANGE_LITERAL    0x801f0000u  /* range defined literally */
#define META_RECURSE          0x80200000u  /* Recursion */
#define META_RECURSE_BYNAME   0x80210000u  /* (?&name) */
#define META_SCRIPT_RUN       0x80220000u  /* (*script_run:...) */

/* These must be kept together to make it easy to check that an assertion
is present where expected in a conditional group. */

#define META_LOOKAHEAD        0x80230000u  /* (?= */
#define META_LOOKAHEADNOT     0x80240000u  /* (?! */
#define META_LOOKBEHIND       0x80250000u  /* (?<= */
#define META_LOOKBEHINDNOT    0x80260000u  /* (?<! */

/* These cannot be conditions */

#define META_LOOKAHEAD_NA     0x80270000u  /* (*napla: */
#define META_LOOKBEHIND_NA    0x80280000u  /* (*naplb: */

/* These must be kept in this order, with consecutive values, and the _ARG
versions of COMMIT, PRUNE, SKIP, and THEN immediately after their non-argument
versions. */

#define META_MARK             0x80290000u  /* (*MARK) */
#define META_ACCEPT           0x802a0000u  /* (*ACCEPT) */
#define META_FAIL             0x802b0000u  /* (*FAIL) */
#define META_COMMIT           0x802c0000u  /* These               */
#define META_COMMIT_ARG       0x802d0000u  /*   pairs             */
#define META_PRUNE            0x802e0000u  /*     must            */
#define META_PRUNE_ARG        0x802f0000u  /*       be            */
#define META_SKIP             0x80300000u  /*         kept        */
#define META_SKIP_ARG         0x80310000u  /*           in        */
#define META_THEN             0x80320000u  /*             this    */
#define META_THEN_ARG         0x80330000u  /*               order */

/* These must be kept in groups of adjacent 3 values, and all together. */

#define META_ASTERISK         0x80340000u  /* *  */
#define META_ASTERISK_PLUS    0x80350000u  /* *+ */
#define META_ASTERISK_QUERY   0x80360000u  /* *? */
#define META_PLUS             0x80370000u  /* +  */
#define META_PLUS_PLUS        0x80380000u  /* ++ */
#define META_PLUS_QUERY       0x80390000u  /* +? */
#define META_QUERY            0x803a0000u  /* ?  */
#define META_QUERY_PLUS       0x803b0000u  /* ?+ */
#define META_QUERY_QUERY      0x803c0000u  /* ?? */
#define META_MINMAX           0x803d0000u  /* {n,m}  repeat */
#define META_MINMAX_PLUS      0x803e0000u  /* {n,m}+ repeat */
#define META_MINMAX_QUERY     0x803f0000u  /* {n,m}? repeat */

#define META_FIRST_QUANTIFIER META_ASTERISK
#define META_LAST_QUANTIFIER  META_MINMAX_QUERY

/* This is a special "meta code" that is used only to distinguish (*asr: from
(*sr: in the table of aphabetic assertions. It is never stored in the parsed
pattern because (*asr: is turned into (*sr:(*atomic: at that stage. There is
therefore no need for it to have a length entry, so use a high value. */

#define META_ATOMIC_SCRIPT_RUN 0x8fff0000u

/* Table of extra lengths for each of the meta codes. Must be kept in step with
the definitions above. For some items these values are a basic length to which
a variable amount has to be added. */

static unsigned char meta_extra_lengths[] = {
  0,             /* META_END */
  0,             /* META_ALT */
  0,             /* META_ATOMIC */
  0,             /* META_BACKREF - more if group is >= 10 */
  1+SIZEOFFSET,  /* META_BACKREF_BYNAME */
  1,             /* META_BIGVALUE */
  3,             /* META_CALLOUT_NUMBER */
  3+SIZEOFFSET,  /* META_CALLOUT_STRING */
  0,             /* META_CAPTURE */
  0,             /* META_CIRCUMFLEX */
  0,             /* META_CLASS */
  0,             /* META_CLASS_EMPTY */
  0,             /* META_CLASS_EMPTY_NOT */
  0,             /* META_CLASS_END */
  0,             /* META_CLASS_NOT */
  0,             /* META_COND_ASSERT */
  SIZEOFFSET,    /* META_COND_DEFINE */
  1+SIZEOFFSET,  /* META_COND_NAME */
  1+SIZEOFFSET,  /* META_COND_NUMBER */
  1+SIZEOFFSET,  /* META_COND_RNAME */
  1+SIZEOFFSET,  /* META_COND_RNUMBER */
  3,             /* META_COND_VERSION */
  0,             /* META_DOLLAR */
  0,             /* META_DOT */
  0,             /* META_ESCAPE - more for ESC_P, ESC_p, ESC_g, ESC_k */
  0,             /* META_KET */
  0,             /* META_NOCAPTURE */
  1,             /* META_OPTIONS */
  1,             /* META_POSIX */
  1,             /* META_POSIX_NEG */
  0,             /* META_RANGE_ESCAPED */
  0,             /* META_RANGE_LITERAL */
  SIZEOFFSET,    /* META_RECURSE */
  1+SIZEOFFSET,  /* META_RECURSE_BYNAME */
  0,             /* META_SCRIPT_RUN */
  0,             /* META_LOOKAHEAD */
  0,             /* META_LOOKAHEADNOT */
  SIZEOFFSET,    /* META_LOOKBEHIND */
  SIZEOFFSET,    /* META_LOOKBEHINDNOT */
  0,             /* META_LOOKAHEAD_NA */
  SIZEOFFSET,    /* META_LOOKBEHIND_NA */
  1,             /* META_MARK - plus the string length */
  0,             /* META_ACCEPT */
  0,             /* META_FAIL */
  0,             /* META_COMMIT */
  1,             /* META_COMMIT_ARG - plus the string length */
  0,             /* META_PRUNE */
  1,             /* META_PRUNE_ARG - plus the string length */
  0,             /* META_SKIP */
  1,             /* META_SKIP_ARG - plus the string length */
  0,             /* META_THEN */
  1,             /* META_THEN_ARG - plus the string length */
  0,             /* META_ASTERISK */
  0,             /* META_ASTERISK_PLUS */
  0,             /* META_ASTERISK_QUERY */
  0,             /* META_PLUS */
  0,             /* META_PLUS_PLUS */
  0,             /* META_PLUS_QUERY */
  0,             /* META_QUERY */
  0,             /* META_QUERY_PLUS */
  0,             /* META_QUERY_QUERY */
  2,             /* META_MINMAX */
  2,             /* META_MINMAX_PLUS */
  2              /* META_MINMAX_QUERY */
};

/* Types for skipping parts of a parsed pattern. */

enum { PSKIP_ALT, PSKIP_CLASS, PSKIP_KET };

/* Macro for setting individual bits in class bitmaps. It took some
experimenting to figure out how to stop gcc 5.3.0 from warning with
-Wconversion. This version gets a warning:

  #define SETBIT(a,b) a[(b)/8] |= (uint8_t)(1u << ((b)&7))

Let's hope the apparently less efficient version isn't actually so bad if the
compiler is clever with identical subexpressions. */

#define SETBIT(a,b) a[(b)/8] = (uint8_t)(a[(b)/8] | (1u << ((b)&7)))

/* Private flags added to firstcu and reqcu. */

#define REQ_CASELESS    (1u << 0)       /* Indicates caselessness */
#define REQ_VARY        (1u << 1)       /* reqcu followed non-literal item */
/* Negative values for the firstcu and reqcu flags */
#define REQ_UNSET       (-2)            /* Not yet found anything */
#define REQ_NONE        (-1)            /* Found not fixed char */

/* These flags are used in the groupinfo vector. */

#define GI_SET_FIXED_LENGTH    0x80000000u
#define GI_NOT_FIXED_LENGTH    0x40000000u
#define GI_FIXED_LENGTH_MASK   0x0000ffffu

/* This simple test for a decimal digit works for both ASCII/Unicode and EBCDIC
and is fast (a good compiler can turn it into a subtraction and unsigned
comparison). */

#define IS_DIGIT(x) ((x) >= CHAR_0 && (x) <= CHAR_9)

/* Table to identify hex digits. The tables in chartables are dependent on the
locale, and may mark arbitrary characters as digits. We want to recognize only
0-9, a-z, and A-Z as hex digits, which is why we have a private table here. It
costs 256 bytes, but it is a lot faster than doing character value tests (at
least in some simple cases I timed), and in some applications one wants PCRE2
to compile efficiently as well as match efficiently. The value in the table is
the binary hex digit value, or 0xff for non-hex digits. */

/* This is the "normal" case, for ASCII systems, and EBCDIC systems running in
UTF-8 mode. */

#ifndef EBCDIC
static const uint8_t xdigitab[] =
  {
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*   0-  7 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*   8- 15 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  16- 23 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  24- 31 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*    - '  */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  ( - /  */
  0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07, /*  0 - 7  */
  0x08,0x09,0xff,0xff,0xff,0xff,0xff,0xff, /*  8 - ?  */
  0xff,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0xff, /*  @ - G  */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  H - O  */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  P - W  */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  X - _  */
  0xff,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0xff, /*  ` - g  */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  h - o  */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  p - w  */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  x -127 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 128-135 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 136-143 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 144-151 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 152-159 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 160-167 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 168-175 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 176-183 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 184-191 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 192-199 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 2ff-207 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 208-215 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 216-223 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 224-231 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 232-239 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 240-247 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};/* 248-255 */

#else

/* This is the "abnormal" case, for EBCDIC systems not running in UTF-8 mode. */

static const uint8_t xdigitab[] =
  {
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*   0-  7  0 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*   8- 15    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  16- 23 10 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  24- 31    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  32- 39 20 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  40- 47    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  48- 55 30 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  56- 63    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*    - 71 40 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  72- |     */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  & - 87 50 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  88- 95    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  - -103 60 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 104- ?     */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 112-119 70 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 120- "     */
  0xff,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0xff, /* 128- g  80 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  h -143    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 144- p  90 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  q -159    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 160- x  A0 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  y -175    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  ^ -183 B0 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 184-191    */
  0xff,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0xff, /*  { - G  C0 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  H -207    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  } - P  D0 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  Q -223    */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  \ - X  E0 */
  0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /*  Y -239    */
  0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07, /*  0 - 7  F0 */
  0x08,0x09,0xff,0xff,0xff,0xff,0xff,0xff};/*  8 -255    */
#endif  /* EBCDIC */


/* Table for handling alphanumeric escaped characters. Positive returns are
simple data values; negative values are for special things like \d and so on.
Zero means further processing is needed (for things like \x), or the escape is
invalid. */

/* This is the "normal" table for ASCII systems or for EBCDIC systems running
in UTF-8 mode. It runs from '0' to 'z'. */

#ifndef EBCDIC
#define ESCAPES_FIRST       CHAR_0
#define ESCAPES_LAST        CHAR_z
#define UPPER_CASE(c)       (c-32)

static const short int escapes[] = {
     0,                       0,
     0,                       0,
     0,                       0,
     0,                       0,
     0,                       0,
     CHAR_COLON,              CHAR_SEMICOLON,
     CHAR_LESS_THAN_SIGN,     CHAR_EQUALS_SIGN,
     CHAR_GREATER_THAN_SIGN,  CHAR_QUESTION_MARK,
     CHAR_COMMERCIAL_AT,      -ESC_A,
     -ESC_B,                  -ESC_C,
     -ESC_D,                  -ESC_E,
     0,                       -ESC_G,
     -ESC_H,                  0,
     0,                       -ESC_K,
     0,                       0,
     -ESC_N,                  0,
     -ESC_P,                  -ESC_Q,
     -ESC_R,                  -ESC_S,
     0,                       0,
     -ESC_V,                  -ESC_W,
     -ESC_X,                  0,
     -ESC_Z,                  CHAR_LEFT_SQUARE_BRACKET,
     CHAR_BACKSLASH,          CHAR_RIGHT_SQUARE_BRACKET,
     CHAR_CIRCUMFLEX_ACCENT,  CHAR_UNDERSCORE,
     CHAR_GRAVE_ACCENT,       CHAR_BEL,
     -ESC_b,                  0,
     -ESC_d,                  CHAR_ESC,
     CHAR_FF,                 0,
     -ESC_h,                  0,
     0,                       -ESC_k,
     0,                       0,
     CHAR_LF,                 0,
     -ESC_p,                  0,
     CHAR_CR,                 -ESC_s,
     CHAR_HT,                 0,
     -ESC_v,                  -ESC_w,
     0,                       0,
     -ESC_z
};

#else

/* This is the "abnormal" table for EBCDIC systems without UTF-8 support.
It runs from 'a' to '9'. For some minimal testing of EBCDIC features, the code
is sometimes compiled on an ASCII system. In this case, we must not use CHAR_a
because it is defined as 'a', which of course picks up the ASCII value. */

#if 'a' == 0x81                    /* Check for a real EBCDIC environment */
#define ESCAPES_FIRST       CHAR_a
#define ESCAPES_LAST        CHAR_9
#define UPPER_CASE(c)       (c+64)
#else                              /* Testing in an ASCII environment */
#define ESCAPES_FIRST  ((unsigned char)'\x81')   /* EBCDIC 'a' */
#define ESCAPES_LAST   ((unsigned char)'\xf9')   /* EBCDIC '9' */
#define UPPER_CASE(c)  (c-32)
#endif

static const short int escapes[] = {
/*  80 */         CHAR_BEL, -ESC_b,       0, -ESC_d, CHAR_ESC, CHAR_FF,      0,
/*  88 */ -ESC_h,        0,      0,     '{',      0,        0,       0,      0,
/*  90 */      0,        0, -ESC_k,       0,      0,  CHAR_LF,       0, -ESC_p,
/*  98 */      0,  CHAR_CR,      0,     '}',      0,        0,       0,      0,
/*  A0 */      0,      '~', -ESC_s, CHAR_HT,      0,   -ESC_v,  -ESC_w,      0,
/*  A8 */      0,   -ESC_z,      0,       0,      0,      '[',       0,      0,
/*  B0 */      0,        0,      0,       0,      0,        0,       0,      0,
/*  B8 */      0,        0,      0,       0,      0,      ']',     '=',    '-',
/*  C0 */    '{',   -ESC_A, -ESC_B,  -ESC_C, -ESC_D,   -ESC_E,       0, -ESC_G,
/*  C8 */ -ESC_H,        0,      0,       0,      0,        0,       0,      0,
/*  D0 */    '}',        0, -ESC_K,       0,      0,   -ESC_N,       0, -ESC_P,
/*  D8 */ -ESC_Q,   -ESC_R,      0,       0,      0,        0,       0,      0,
/*  E0 */   '\\',        0, -ESC_S,       0,      0,   -ESC_V,  -ESC_W, -ESC_X,
/*  E8 */      0,   -ESC_Z,      0,       0,      0,        0,       0,      0,
/*  F0 */      0,        0,      0,       0,      0,        0,       0,      0,
/*  F8 */      0,        0
};

/* We also need a table of characters that may follow \c in an EBCDIC
environment for characters 0-31. */

static unsigned char ebcdic_escape_c[] = "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_";

#endif   /* EBCDIC */


/* Table of special "verbs" like (*PRUNE). This is a short table, so it is
searched linearly. Put all the names into a single string, in order to reduce
the number of relocations when a shared library is dynamically linked. The
string is built from string macros so that it works in UTF-8 mode on EBCDIC
platforms. */

typedef struct verbitem {
  unsigned int len;          /* Length of verb name */
  uint32_t meta;             /* Base META_ code */
  int has_arg;               /* Argument requirement */
} verbitem;

static const char verbnames[] =
  "\0"                       /* Empty name is a shorthand for MARK */
  STRING_MARK0
  STRING_ACCEPT0
  STRING_F0
  STRING_FAIL0
  STRING_COMMIT0
  STRING_PRUNE0
  STRING_SKIP0
  STRING_THEN;

static const verbitem verbs[] = {
  { 0, META_MARK,   +1 },  /* > 0 => must have an argument */
  { 4, META_MARK,   +1 },
  { 6, META_ACCEPT, -1 },  /* < 0 => Optional argument, convert to pre-MARK */
  { 1, META_FAIL,   -1 },
  { 4, META_FAIL,   -1 },
  { 6, META_COMMIT,  0 },
  { 5, META_PRUNE,   0 },  /* Optional argument; bump META code if found */
  { 4, META_SKIP,    0 },
  { 4, META_THEN,    0 }
};

static const int verbcount = sizeof(verbs)/sizeof(verbitem);

/* Verb opcodes, indexed by their META code offset from META_MARK. */

static const uint32_t verbops[] = {
  OP_MARK, OP_ACCEPT, OP_FAIL, OP_COMMIT, OP_COMMIT_ARG, OP_PRUNE,
  OP_PRUNE_ARG, OP_SKIP, OP_SKIP_ARG, OP_THEN, OP_THEN_ARG };

/* Table of "alpha assertions" like (*pla:...), similar to the (*VERB) table. */

typedef struct alasitem {
  unsigned int len;          /* Length of name */
  uint32_t meta;             /* Base META_ code */
} alasitem;

static const char alasnames[] =
  STRING_pla0
  STRING_plb0
  STRING_napla0
  STRING_naplb0
  STRING_nla0
  STRING_nlb0
  STRING_positive_lookahead0
  STRING_positive_lookbehind0
  STRING_non_atomic_positive_lookahead0
  STRING_non_atomic_positive_lookbehind0
  STRING_negative_lookahead0
  STRING_negative_lookbehind0
  STRING_atomic0
  STRING_sr0
  STRING_asr0
  STRING_script_run0
  STRING_atomic_script_run;

static const alasitem alasmeta[] = {
  {  3, META_LOOKAHEAD         },
  {  3, META_LOOKBEHIND        },
  {  5, META_LOOKAHEAD_NA      },
  {  5, META_LOOKBEHIND_NA     },
  {  3, META_LOOKAHEADNOT      },
  {  3, META_LOOKBEHINDNOT     },
  { 18, META_LOOKAHEAD         },
  { 19, META_LOOKBEHIND        },
  { 29, META_LOOKAHEAD_NA      },
  { 30, META_LOOKBEHIND_NA     },
  { 18, META_LOOKAHEADNOT      },
  { 19, META_LOOKBEHINDNOT     },
  {  6, META_ATOMIC            },
  {  2, META_SCRIPT_RUN        }, /* sr = script run */
  {  3, META_ATOMIC_SCRIPT_RUN }, /* asr = atomic script run */
  { 10, META_SCRIPT_RUN        }, /* script run */
  { 17, META_ATOMIC_SCRIPT_RUN }  /* atomic script run */
};

static const int alascount = sizeof(alasmeta)/sizeof(alasitem);

/* Offsets from OP_STAR for case-independent and negative repeat opcodes. */

static uint32_t chartypeoffset[] = {
  OP_STAR - OP_STAR,    OP_STARI - OP_STAR,
  OP_NOTSTAR - OP_STAR, OP_NOTSTARI - OP_STAR };

/* Tables of names of POSIX character classes and their lengths. The names are
now all in a single string, to reduce the number of relocations when a shared
library is dynamically loaded. The list of lengths is terminated by a zero
length entry. The first three must be alpha, lower, upper, as this is assumed
for handling case independence. The indices for graph, print, and punct are
needed, so identify them. */

static const char posix_names[] =
  STRING_alpha0 STRING_lower0 STRING_upper0 STRING_alnum0
  STRING_ascii0 STRING_blank0 STRING_cntrl0 STRING_digit0
  STRING_graph0 STRING_print0 STRING_punct0 STRING_space0
  STRING_word0  STRING_xdigit;

static const uint8_t posix_name_lengths[] = {
  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 6, 0 };

#define PC_GRAPH  8
#define PC_PRINT  9
#define PC_PUNCT 10

/* Table of class bit maps for each POSIX class. Each class is formed from a
base map, with an optional addition or removal of another map. Then, for some
classes, there is some additional tweaking: for [:blank:] the vertical space
characters are removed, and for [:alpha:] and [:alnum:] the underscore
character is removed. The triples in the table consist of the base map offset,
second map offset or -1 if no second map, and a non-negative value for map
addition or a negative value for map subtraction (if there are two maps). The
absolute value of the third field has these meanings: 0 => no tweaking, 1 =>
remove vertical space characters, 2 => remove underscore. */

static const int posix_class_maps[] = {
  cbit_word,  cbit_digit, -2,             /* alpha */
  cbit_lower, -1,          0,             /* lower */
  cbit_upper, -1,          0,             /* upper */
  cbit_word,  -1,          2,             /* alnum - word without underscore */
  cbit_print, cbit_cntrl,  0,             /* ascii */
  cbit_space, -1,          1,             /* blank - a GNU extension */
  cbit_cntrl, -1,          0,             /* cntrl */
  cbit_digit, -1,          0,             /* digit */
  cbit_graph, -1,          0,             /* graph */
  cbit_print, -1,          0,             /* print */
  cbit_punct, -1,          0,             /* punct */
  cbit_space, -1,          0,             /* space */
  cbit_word,  -1,          0,             /* word - a Perl extension */
  cbit_xdigit,-1,          0              /* xdigit */
};

#ifdef SUPPORT_UNICODE

/* The POSIX class Unicode property substitutes that are used in UCP mode must
be in the order of the POSIX class names, defined above. */

static int posix_substitutes[] = {
  PT_GC, ucp_L,     /* alpha */
  PT_PC, ucp_Ll,    /* lower */
  PT_PC, ucp_Lu,    /* upper */
  PT_ALNUM, 0,      /* alnum */
  -1, 0,            /* ascii, treat as non-UCP */
  -1, 1,            /* blank, treat as \h */
  PT_PC, ucp_Cc,    /* cntrl */
  PT_PC, ucp_Nd,    /* digit */
  PT_PXGRAPH, 0,    /* graph */
  PT_PXPRINT, 0,    /* print */
  PT_PXPUNCT, 0,    /* punct */
  PT_PXSPACE, 0,    /* space */   /* Xps is POSIX space, but from 8.34 */
  PT_WORD, 0,       /* word  */   /* Perl and POSIX space are the same */
  -1, 0             /* xdigit, treat as non-UCP */
};
#define POSIX_SUBSIZE (sizeof(posix_substitutes) / (2*sizeof(uint32_t)))
#endif  /* SUPPORT_UNICODE */

/* Masks for checking option settings. When PCRE2_LITERAL is set, only a subset
are allowed. */

#define PUBLIC_LITERAL_COMPILE_OPTIONS \
  (PCRE2_ANCHORED|PCRE2_AUTO_CALLOUT|PCRE2_CASELESS|PCRE2_ENDANCHORED| \
   PCRE2_FIRSTLINE|PCRE2_LITERAL|PCRE2_MATCH_INVALID_UTF| \
   PCRE2_NO_START_OPTIMIZE|PCRE2_NO_UTF_CHECK|PCRE2_USE_OFFSET_LIMIT|PCRE2_UTF)

#define PUBLIC_COMPILE_OPTIONS \
  (PUBLIC_LITERAL_COMPILE_OPTIONS| \
   PCRE2_ALLOW_EMPTY_CLASS|PCRE2_ALT_BSUX|PCRE2_ALT_CIRCUMFLEX| \
   PCRE2_ALT_VERBNAMES|PCRE2_DOLLAR_ENDONLY|PCRE2_DOTALL|PCRE2_DUPNAMES| \
   PCRE2_EXTENDED|PCRE2_EXTENDED_MORE|PCRE2_MATCH_UNSET_BACKREF| \
   PCRE2_MULTILINE|PCRE2_NEVER_BACKSLASH_C|PCRE2_NEVER_UCP| \
   PCRE2_NEVER_UTF|PCRE2_NO_AUTO_CAPTURE|PCRE2_NO_AUTO_POSSESS| \
   PCRE2_NO_DOTSTAR_ANCHOR|PCRE2_UCP|PCRE2_UNGREEDY)

#define PUBLIC_LITERAL_COMPILE_EXTRA_OPTIONS \
   (PCRE2_EXTRA_MATCH_LINE|PCRE2_EXTRA_MATCH_WORD)

#define PUBLIC_COMPILE_EXTRA_OPTIONS \
   (PUBLIC_LITERAL_COMPILE_EXTRA_OPTIONS| \
    PCRE2_EXTRA_ALLOW_SURROGATE_ESCAPES|PCRE2_EXTRA_BAD_ESCAPE_IS_LITERAL| \
    PCRE2_EXTRA_ESCAPED_CR_IS_LF|PCRE2_EXTRA_ALT_BSUX)

/* Compile time error code numbers. They are given names so that they can more
easily be tracked. When a new number is added, the tables called eint1 and
eint2 in pcre2posix.c may need to be updated, and a new error text must be
added to compile_error_texts in pcre2_error.c. */

enum { ERR0 = COMPILE_ERROR_BASE,
       ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,
       ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,
       ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR28, ERR29, ERR30,
       ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,
       ERR41, ERR42, ERR43, ERR44, ERR45, ERR46, ERR47, ERR48, ERR49, ERR50,
       ERR51, ERR52, ERR53, ERR54, ERR55, ERR56, ERR57, ERR58, ERR59, ERR60,
       ERR61, ERR62, ERR63, ERR64, ERR65, ERR66, ERR67, ERR68, ERR69, ERR70,
       ERR71, ERR72, ERR73, ERR74, ERR75, ERR76, ERR77, ERR78, ERR79, ERR80,
       ERR81, ERR82, ERR83, ERR84, ERR85, ERR86, ERR87, ERR88, ERR89, ERR90,
       ERR91, ERR92, ERR93, ERR94, ERR95, ERR96, ERR97, ERR98 };

/* This is a table of start-of-pattern options such as (*UTF) and settings such
as (*LIMIT_MATCH=nnnn) and (*CRLF). For completeness and backward
compatibility, (*UTFn) is supported in the relevant libraries, but (*UTF) is
generic and always supported. */

enum { PSO_OPT,     /* Value is an option bit */
       PSO_FLG,     /* Value is a flag bit */
       PSO_NL,      /* Value is a newline type */
       PSO_BSR,     /* Value is a \R type */
       PSO_LIMH,    /* Read integer value for heap limit */
       PSO_LIMM,    /* Read integer value for match limit */
       PSO_LIMD };  /* Read integer value for depth limit */

typedef struct pso {
  const uint8_t *name;
  uint16_t length;
  uint16_t type;
  uint32_t value;
} pso;

/* NB: STRING_UTFn_RIGHTPAR contains the length as well */

static pso pso_list[] = {
  { (uint8_t *)STRING_UTFn_RIGHTPAR,                  PSO_OPT, PCRE2_UTF },
  { (uint8_t *)STRING_UTF_RIGHTPAR,                4, PSO_OPT, PCRE2_UTF },
  { (uint8_t *)STRING_UCP_RIGHTPAR,                4, PSO_OPT, PCRE2_UCP },
  { (uint8_t *)STRING_NOTEMPTY_RIGHTPAR,           9, PSO_FLG, PCRE2_NOTEMPTY_SET },
  { (uint8_t *)STRING_NOTEMPTY_ATSTART_RIGHTPAR,  17, PSO_FLG, PCRE2_NE_ATST_SET },
  { (uint8_t *)STRING_NO_AUTO_POSSESS_RIGHTPAR,   16, PSO_OPT, PCRE2_NO_AUTO_POSSESS },
  { (uint8_t *)STRING_NO_DOTSTAR_ANCHOR_RIGHTPAR, 18, PSO_OPT, PCRE2_NO_DOTSTAR_ANCHOR },
  { (uint8_t *)STRING_NO_JIT_RIGHTPAR,             7, PSO_FLG, PCRE2_NOJIT },
  { (uint8_t *)STRING_NO_START_OPT_RIGHTPAR,      13, PSO_OPT, PCRE2_NO_START_OPTIMIZE },
  { (uint8_t *)STRING_LIMIT_HEAP_EQ,              11, PSO_LIMH, 0 },
  { (uint8_t *)STRING_LIMIT_MATCH_EQ,             12, PSO_LIMM, 0 },
  { (uint8_t *)STRING_LIMIT_DEPTH_EQ,             12, PSO_LIMD, 0 },
  { (uint8_t *)STRING_LIMIT_RECURSION_EQ,         16, PSO_LIMD, 0 },
  { (uint8_t *)STRING_CR_RIGHTPAR,                 3, PSO_NL,  PCRE2_NEWLINE_CR },
  { (uint8_t *)STRING_LF_RIGHTPAR,                 3, PSO_NL,  PCRE2_NEWLINE_LF },
  { (uint8_t *)STRING_CRLF_RIGHTPAR,               5, PSO_NL,  PCRE2_NEWLINE_CRLF },
  { (uint8_t *)STRING_ANY_RIGHTPAR,                4, PSO_NL,  PCRE2_NEWLINE_ANY },
  { (uint8_t *)STRING_NUL_RIGHTPAR,                4, PSO_NL,  PCRE2_NEWLINE_NUL },
  { (uint8_t *)STRING_ANYCRLF_RIGHTPAR,            8, PSO_NL,  PCRE2_NEWLINE_ANYCRLF },
  { (uint8_t *)STRING_BSR_ANYCRLF_RIGHTPAR,       12, PSO_BSR, PCRE2_BSR_ANYCRLF },
  { (uint8_t *)STRING_BSR_UNICODE_RIGHTPAR,       12, PSO_BSR, PCRE2_BSR_UNICODE }
};

/* This table is used when converting repeating opcodes into possessified
versions as a result of an explicit possessive quantifier such as ++. A zero
value means there is no possessified version - in those cases the item in
question must be wrapped in ONCE brackets. The table is truncated at OP_CALLOUT
because all relevant opcodes are less than that. */

static const uint8_t opcode_possessify[] = {
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   /* 0 - 15  */
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   /* 16 - 31 */

  0,                       /* NOTI */
  OP_POSSTAR, 0,           /* STAR, MINSTAR */
  OP_POSPLUS, 0,           /* PLUS, MINPLUS */
  OP_POSQUERY, 0,          /* QUERY, MINQUERY */
  OP_POSUPTO, 0,           /* UPTO, MINUPTO */
  0,                       /* EXACT */
  0, 0, 0, 0,              /* POS{STAR,PLUS,QUERY,UPTO} */

  OP_POSSTARI, 0,          /* STARI, MINSTARI */
  OP_POSPLUSI, 0,          /* PLUSI, MINPLUSI */
  OP_POSQUERYI, 0,         /* QUERYI, MINQUERYI */
  OP_POSUPTOI, 0,          /* UPTOI, MINUPTOI */
  0,                       /* EXACTI */
  0, 0, 0, 0,              /* POS{STARI,PLUSI,QUERYI,UPTOI} */

  OP_NOTPOSSTAR, 0,        /* NOTSTAR, NOTMINSTAR */
  OP_NOTPOSPLUS, 0,        /* NOTPLUS, NOTMINPLUS */
  OP_NOTPOSQUERY, 0,       /* NOTQUERY, NOTMINQUERY */
  OP_NOTPOSUPTO, 0,        /* NOTUPTO, NOTMINUPTO */
  0,                       /* NOTEXACT */
  0, 0, 0, 0,              /* NOTPOS{STAR,PLUS,QUERY,UPTO} */

  OP_NOTPOSSTARI, 0,       /* NOTSTARI, NOTMINSTARI */
  OP_NOTPOSPLUSI, 0,       /* NOTPLUSI, NOTMINPLUSI */
  OP_NOTPOSQUERYI, 0,      /* NOTQUERYI, NOTMINQUERYI */
  OP_NOTPOSUPTOI, 0,       /* NOTUPTOI, NOTMINUPTOI */
  0,                       /* NOTEXACTI */
  0, 0, 0, 0,              /* NOTPOS{STARI,PLUSI,QUERYI,UPTOI} */

  OP_TYPEPOSSTAR, 0,       /* TYPESTAR, TYPEMINSTAR */
  OP_TYPEPOSPLUS, 0,       /* TYPEPLUS, TYPEMINPLUS */
  OP_TYPEPOSQUERY, 0,      /* TYPEQUERY, TYPEMINQUERY */
  OP_TYPEPOSUPTO, 0,       /* TYPEUPTO, TYPEMINUPTO */
  0,                       /* TYPEEXACT */
  0, 0, 0, 0,              /* TYPEPOS{STAR,PLUS,QUERY,UPTO} */

  OP_CRPOSSTAR, 0,         /* CRSTAR, CRMINSTAR */
  OP_CRPOSPLUS, 0,         /* CRPLUS, CRMINPLUS */
  OP_CRPOSQUERY, 0,        /* CRQUERY, CRMINQUERY */
  OP_CRPOSRANGE, 0,        /* CRRANGE, CRMINRANGE */
  0, 0, 0, 0,              /* CRPOS{STAR,PLUS,QUERY,RANGE} */

  0, 0, 0,                 /* CLASS, NCLASS, XCLASS */
  0, 0,                    /* REF, REFI */
  0, 0,                    /* DNREF, DNREFI */
  0, 0                     /* RECURSE, CALLOUT */
};


#ifdef DEBUG_SHOW_PARSED
/*************************************************
*     Show the parsed pattern for debugging      *
*************************************************/

/* For debugging the pre-scan, this code, which outputs the parsed data vector,
can be enabled. */

static void show_parsed(compile_block *cb)
{
uint32_t *pptr = cb->parsed_pattern;

for (;;)
  {
  int max, min;
  PCRE2_SIZE offset;
  uint32_t i;
  uint32_t length;
  uint32_t meta_arg = META_DATA(*pptr);

  fprintf(stderr, "+++ %02d %.8x ", (int)(pptr - cb->parsed_pattern), *pptr);

  if (*pptr < META_END)
    {
    if (*pptr > 32 && *pptr < 128) fprintf(stderr, "%c", *pptr);
    pptr++;
    }

  else switch (META_CODE(*pptr++))
    {
    default:
    fprintf(stderr, "**** OOPS - unknown META value - giving up ****\n");
    return;

    case META_END:
    fprintf(stderr, "META_END\n");
    return;

    case META_CAPTURE:
    fprintf(stderr, "META_CAPTURE %d", meta_arg);
    break;

    case META_RECURSE:
    GETOFFSET(offset, pptr);
    fprintf(stderr, "META_RECURSE %d %zd", meta_arg, offset);
    break;

    case META_BACKREF:
    if (meta_arg < 10)
      offset = cb->small_ref_offset[meta_arg];
    else
      GETOFFSET(offset, pptr);
    fprintf(stderr, "META_BACKREF %d %zd", meta_arg, offset);
    break;

    case META_ESCAPE:
    if (meta_arg == ESC_P || meta_arg == ESC_p)
      {
      uint32_t ptype = *pptr >> 16;
      uint32_t pvalue = *pptr++ & 0xffff;
      fprintf(stderr, "META \\%c %d %d", (meta_arg == ESC_P)? 'P':'p',
        ptype, pvalue);
      }
    else
      {
      uint32_t cc;
      /* There's just one escape we might have here that isn't negated in the
      escapes table. */
      if (meta_arg == ESC_g) cc = CHAR_g;
      else for (cc = ESCAPES_FIRST; cc <= ESCAPES_LAST; cc++)
        {
        if (meta_arg == (uint32_t)(-escapes[cc - ESCAPES_FIRST])) break;
        }
      if (cc > ESCAPES_LAST) cc = CHAR_QUESTION_MARK;
      fprintf(stderr, "META \\%c", cc);
      }
    break;

    case META_MINMAX:
    min = *pptr++;
    max = *pptr++;
    if (max != REPEAT_UNLIMITED)
      fprintf(stderr, "META {%d,%d}", min, max);
    else
      fprintf(stderr, "META {%d,}", min);
    break;

    case META_MINMAX_QUERY:
    min = *pptr++;
    max = *pptr++;
    if (max != REPEAT_UNLIMITED)
      fprintf(stderr, "META {%d,%d}?", min, max);
    else
      fprintf(stderr, "META {%d,}?", min);
    break;

    case META_MINMAX_PLUS:
    min = *pptr++;
    max = *pptr++;
    if (max != REPEAT_UNLIMITED)
      fprintf(stderr, "META {%d,%d}+", min, max);
    else
      fprintf(stderr, "META {%d,}+", min);
    break;

    case META_BIGVALUE: fprintf(stderr, "META_BIGVALUE %.8x", *pptr++); break;
    case META_CIRCUMFLEX: fprintf(stderr, "META_CIRCUMFLEX"); break;
    case META_COND_ASSERT: fprintf(stderr, "META_COND_ASSERT"); break;
    case META_DOLLAR: fprintf(stderr, "META_DOLLAR"); break;
    case META_DOT: fprintf(stderr, "META_DOT"); break;
    case META_ASTERISK: fprintf(stderr, "META *"); break;
    case META_ASTERISK_QUERY: fprintf(stderr, "META *?"); break;
    case META_ASTERISK_PLUS: fprintf(stderr, "META *+"); break;
    case META_PLUS: fprintf(stderr, "META +"); break;
    case META_PLUS_QUERY: fprintf(stderr, "META +?"); break;
    case META_PLUS_PLUS: fprintf(stderr, "META ++"); break;
    case META_QUERY: fprintf(stderr, "META ?"); break;
    case META_QUERY_QUERY: fprintf(stderr, "META ??"); break;
    case META_QUERY_PLUS: fprintf(stderr, "META ?+"); break;

    case META_ATOMIC: fprintf(stderr, "META (?>"); break;
    case META_NOCAPTURE: fprintf(stderr, "META (?:"); break;
    case META_LOOKAHEAD: fprintf(stderr, "META (?="); break;
    case META_LOOKAHEADNOT: fprintf(stderr, "META (?!"); break;
    case META_LOOKAHEAD_NA: fprintf(stderr, "META (*napla:"); break;
    case META_SCRIPT_RUN: fprintf(stderr, "META (*sr:"); break;
    case META_KET: fprintf(stderr, "META )"); break;
    case META_ALT: fprintf(stderr, "META | %d", meta_arg); break;

    case META_CLASS: fprintf(stderr, "META ["); break;
    case META_CLASS_NOT: fprintf(stderr, "META [^"); break;
    case META_CLASS_END: fprintf(stderr, "META ]"); break;
    case META_CLASS_EMPTY: fprintf(stderr, "META []"); break;
    case META_CLASS_EMPTY_NOT: fprintf(stderr, "META [^]"); break;

    case META_RANGE_LITERAL: fprintf(stderr, "META - (literal)"); break;
    case META_RANGE_ESCAPED: fprintf(stderr, "META - (escaped)"); break;

    case META_POSIX: fprintf(stderr, "META_POSIX %d", *pptr++); break;
    case META_POSIX_NEG: fprintf(stderr, "META_POSIX_NEG %d", *pptr++); break;

    case META_ACCEPT: fprintf(stderr, "META (*ACCEPT)"); break;
    case META_FAIL: fprintf(stderr, "META (*FAIL)"); break;
    case META_COMMIT: fprintf(stderr, "META (*COMMIT)"); break;
    case META_PRUNE: fprintf(stderr, "META (*PRUNE)"); break;
    case META_SKIP: fprintf(stderr, "META (*SKIP)"); break;
    case META_THEN: fprintf(stderr, "META (*THEN)"); break;

    case META_OPTIONS: fprintf(stderr, "META_OPTIONS 0x%02x", *pptr++); break;

    case META_LOOKBEHIND:
    fprintf(stderr, "META (?<= %d offset=", meta_arg);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    case META_LOOKBEHIND_NA:
    fprintf(stderr, "META (*naplb: %d offset=", meta_arg);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    case META_LOOKBEHINDNOT:
    fprintf(stderr, "META (?<! %d offset=", meta_arg);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    case META_CALLOUT_NUMBER:
    fprintf(stderr, "META (?C%d) next=%d/%d", pptr[2], pptr[0],
       pptr[1]);
    pptr += 3;
    break;

    case META_CALLOUT_STRING:
      {
      uint32_t patoffset = *pptr++;    /* Offset of next pattern item */
      uint32_t patlength = *pptr++;    /* Length of next pattern item */
      fprintf(stderr, "META (?Cstring) length=%d offset=", *pptr++);
      GETOFFSET(offset, pptr);
      fprintf(stderr, "%zd next=%d/%d", offset, patoffset, patlength);
      }
    break;

    case META_RECURSE_BYNAME:
    fprintf(stderr, "META (?(&name) length=%d offset=", *pptr++);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    case META_BACKREF_BYNAME:
    fprintf(stderr, "META_BACKREF_BYNAME length=%d offset=", *pptr++);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    case META_COND_NUMBER:
    fprintf(stderr, "META_COND_NUMBER %d offset=", pptr[SIZEOFFSET]);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    pptr++;
    break;

    case META_COND_DEFINE:
    fprintf(stderr, "META (?(DEFINE) offset=");
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    case META_COND_VERSION:
    fprintf(stderr, "META (?(VERSION%s", (*pptr++ == 0)? "=" : ">=");
    fprintf(stderr, "%d.", *pptr++);
    fprintf(stderr, "%d)", *pptr++);
    break;

    case META_COND_NAME:
    fprintf(stderr, "META (?(<name>) length=%d offset=", *pptr++);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    case META_COND_RNAME:
    fprintf(stderr, "META (?(R&name) length=%d offset=", *pptr++);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    /* This is kept as a name, because it might be. */

    case META_COND_RNUMBER:
    fprintf(stderr, "META (?(Rnumber) length=%d offset=", *pptr++);
    GETOFFSET(offset, pptr);
    fprintf(stderr, "%zd", offset);
    break;

    case META_MARK:
    fprintf(stderr, "META (*MARK:");
    goto SHOWARG;

    case META_COMMIT_ARG:
    fprintf(stderr, "META (*COMMIT:");
    goto SHOWARG;

    case META_PRUNE_ARG:
    fprintf(stderr, "META (*PRUNE:");
    goto SHOWARG;

    case META_SKIP_ARG:
    fprintf(stderr, "META (*SKIP:");
    goto SHOWARG;

    case META_THEN_ARG:
    fprintf(stderr, "META (*THEN:");
    SHOWARG:
    length = *pptr++;
    for (i = 0; i < length; i++)
      {
      uint32_t cc = *pptr++;
      if (cc > 32 && cc < 128) fprintf(stderr, "%c", cc);
        else fprintf(stderr, "\\x{%x}", cc);
      }
    fprintf(stderr, ") length=%u", length);
    break;
    }
  fprintf(stderr, "\n");
  }
return;
}
#endif  /* DEBUG_SHOW_PARSED */



/*************************************************
*               Copy compiled code               *
*************************************************/

/* Compiled JIT code cannot be copied, so the new compiled block has no
associated JIT data. */

PCRE2_EXP_DEFN pcre2_code * PCRE2_CALL_CONVENTION
pcre2_code_copy(const pcre2_code *code)
{
PCRE2_SIZE* ref_count;
pcre2_code *newcode;

if (code == NULL) return NULL;
newcode = code->memctl.malloc(code->blocksize, code->memctl.memory_data);
if (newcode == NULL) return NULL;
memcpy(newcode, code, code->blocksize);
newcode->executable_jit = NULL;

/* If the code is one that has been deserialized, increment the reference count
in the decoded tables. */

if ((code->flags & PCRE2_DEREF_TABLES) != 0)
  {
  ref_count = (PCRE2_SIZE *)(code->tables + tables_length);
  (*ref_count)++;
  }

return newcode;
}



/*************************************************
*     Copy compiled code and character tables    *
*************************************************/

/* Compiled JIT code cannot be copied, so the new compiled block has no
associated JIT data. This version of code_copy also makes a separate copy of
the character tables. */

PCRE2_EXP_DEFN pcre2_code * PCRE2_CALL_CONVENTION
pcre2_code_copy_with_tables(const pcre2_code *code)
{
PCRE2_SIZE* ref_count;
pcre2_code *newcode;
uint8_t *newtables;

if (code == NULL) return NULL;
newcode = code->memctl.malloc(code->blocksize, code->memctl.memory_data);
if (newcode == NULL) return NULL;
memcpy(newcode, code, code->blocksize);
newcode->executable_jit = NULL;

newtables = code->memctl.malloc(tables_length + sizeof(PCRE2_SIZE),
  code->memctl.memory_data);
if (newtables == NULL)
  {
  code->memctl.free((void *)newcode, code->memctl.memory_data);
  return NULL;
  }
memcpy(newtables, code->tables, tables_length);
ref_count = (PCRE2_SIZE *)(newtables + tables_length);
*ref_count = 1;

newcode->tables = newtables;
newcode->flags |= PCRE2_DEREF_TABLES;
return newcode;
}



/*************************************************
*               Free compiled code               *
*************************************************/

PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
pcre2_code_free(pcre2_code *code)
{
PCRE2_SIZE* ref_count;

if (code != NULL)
  {
  if (code->executable_jit != NULL)
    PRIV(jit_free)(code->executable_jit, &code->memctl);

  if ((code->flags & PCRE2_DEREF_TABLES) != 0)
    {
    /* Decoded tables belong to the codes after deserialization, and they must
    be freed when there are no more references to them. The *ref_count should
    always be > 0. */

    ref_count = (PCRE2_SIZE *)(code->tables + tables_length);
    if (*ref_count > 0)
      {
      (*ref_count)--;
      if (*ref_count == 0)
        code->memctl.free((void *)code->tables, code->memctl.memory_data);
      }
    }

  code->memctl.free(code, code->memctl.memory_data);
  }
}



/*************************************************
*         Read a number, possibly signed         *
*************************************************/

/* This function is used to read numbers in the pattern. The initial pointer
must be the sign or first digit of the number. When relative values (introduced
by + or -) are allowed, they are relative group numbers, and the result must be
greater than zero.

Arguments:
  ptrptr      points to the character pointer variable
  ptrend      points to the end of the input string
  allow_sign  if < 0, sign not allowed; if >= 0, sign is relative to this
  max_value   the largest number allowed
  max_error   the error to give for an over-large number
  intptr      where to put the result
  errcodeptr  where to put an error code

Returns:      TRUE  - a number was read
              FALSE - errorcode == 0 => no number was found
                      errorcode != 0 => an error occurred
*/

static BOOL
read_number(PCRE2_SPTR *ptrptr, PCRE2_SPTR ptrend, int32_t allow_sign,
  uint32_t max_value, uint32_t max_error, int *intptr, int *errorcodeptr)
{
int sign = 0;
uint32_t n = 0;
PCRE2_SPTR ptr = *ptrptr;
BOOL yield = FALSE;

*errorcodeptr = 0;

if (allow_sign >= 0 && ptr < ptrend)
  {
  if (*ptr == CHAR_PLUS)
    {
    sign = +1;
    max_value -= allow_sign;
    ptr++;
    }
  else if (*ptr == CHAR_MINUS)
    {
    sign = -1;
    ptr++;
    }
  }

if (ptr >= ptrend || !IS_DIGIT(*ptr)) return FALSE;
while (ptr < ptrend && IS_DIGIT(*ptr))
  {
  n = n * 10 + *ptr++ - CHAR_0;
  if (n > max_value)
    {
    *errorcodeptr = max_error;
    goto EXIT;
    }
  }

if (allow_sign >= 0 && sign != 0)
  {
  if (n == 0)
    {
    *errorcodeptr = ERR26;  /* +0 and -0 are not allowed */
    goto EXIT;
    }

  if (sign > 0) n += allow_sign;
  else if ((int)n > allow_sign)
    {
    *errorcodeptr = ERR15;  /* Non-existent subpattern */
    goto EXIT;
    }
  else n = allow_sign + 1 - n;
  }

yield = TRUE;

EXIT:
*intptr = n;
*ptrptr = ptr;
return yield;
}



/*************************************************
*         Read repeat counts                     *
*************************************************/

/* Read an item of the form {n,m} and return the values if non-NULL pointers
are supplied. Repeat counts must be less than 65536 (MAX_REPEAT_COUNT); a
larger value is used for "unlimited". We have to use signed arguments for
read_number() because it is capable of returning a signed value.

Arguments:
  ptrptr         points to pointer to character after'{'
  ptrend         pointer to end of input
  minp           if not NULL, pointer to int for min
  maxp           if not NULL, pointer to int for max (-1 if no max)
                 returned as -1 if no max
  errorcodeptr   points to error code variable

Returns:         FALSE if not a repeat quantifier, errorcode set zero
                 FALSE on error, with errorcode set non-zero
                 TRUE on success, with pointer updated to point after '}'
*/

static BOOL
read_repeat_counts(PCRE2_SPTR *ptrptr, PCRE2_SPTR ptrend, uint32_t *minp,
  uint32_t *maxp, int *errorcodeptr)
{
PCRE2_SPTR p = *ptrptr;
BOOL yield = FALSE;
int32_t min = 0;
int32_t max = REPEAT_UNLIMITED; /* This value is larger than MAX_REPEAT_COUNT */

/* NB read_number() initializes the error code to zero. The only error is for a
number that is too big. */

if (!read_number(&p, ptrend, -1, MAX_REPEAT_COUNT, ERR5, &min, errorcodeptr))
  goto EXIT;

if (p >= ptrend) goto EXIT;

if (*p == CHAR_RIGHT_CURLY_BRACKET)
  {
  p++;
  max = min;
  }

else
  {
  if (*p++ != CHAR_COMMA || p >= ptrend) goto EXIT;
  if (*p != CHAR_RIGHT_CURLY_BRACKET)
    {
    if (!read_number(&p, ptrend, -1, MAX_REPEAT_COUNT, ERR5, &max,
        errorcodeptr) || p >= ptrend ||  *p != CHAR_RIGHT_CURLY_BRACKET)
      goto EXIT;
    if (max < min)
      {
      *errorcodeptr = ERR4;
      goto EXIT;
      }
    }
  p++;
  }

yield = TRUE;
if (minp != NULL) *minp = (uint32_t)min;
if (maxp != NULL) *maxp = (uint32_t)max;

/* Update the pattern pointer on success, or after an error, but not when
the result is "not a repeat quantifier". */

EXIT:
if (yield || *errorcodeptr != 0) *ptrptr = p;
return yield;
}



/*************************************************
*            Handle escapes                      *
*************************************************/

/* This function is called when a \ has been encountered. It either returns a
positive value for a simple escape such as \d, or 0 for a data character, which
is placed in chptr. A backreference to group n is returned as negative n. On
entry, ptr is pointing at the character after \. On exit, it points after the
final code unit of the escape sequence.

This function is also called from pcre2_substitute() to handle escape sequences
in replacement strings. In this case, the cb argument is NULL, and in the case
of escapes that have further processing, only sequences that define a data
character are recognised. The isclass argument is not relevant; the options
argument is the final value of the compiled pattern's options.

Arguments:
  ptrptr         points to the input position pointer
  ptrend         points to the end of the input
  chptr          points to a returned data character
  errorcodeptr   points to the errorcode variable (containing zero)
  options        the current options bits
  isclass        TRUE if inside a character class
  cb             compile data block or NULL when called from pcre2_substitute()

Returns:         zero => a data character
                 positive => a special escape sequence
                 negative => a numerical back reference
                 on error, errorcodeptr is set non-zero
*/

int
PRIV(check_escape)(PCRE2_SPTR *ptrptr, PCRE2_SPTR ptrend, uint32_t *chptr,
  int *errorcodeptr, uint32_t options, uint32_t extra_options, BOOL isclass,
  compile_block *cb)
{
BOOL utf = (options & PCRE2_UTF) != 0;
PCRE2_SPTR ptr = *ptrptr;
uint32_t c, cc;
int escape = 0;
int i;

/* If backslash is at the end of the string, it's an error. */

if (ptr >= ptrend)
  {
  *errorcodeptr = ERR1;
  return 0;
  }

GETCHARINCTEST(c, ptr);         /* Get character value, increment pointer */
*errorcodeptr = 0;              /* Be optimistic */

/* Non-alphanumerics are literals, so we just leave the value in c. An initial
value test saves a memory lookup for code points outside the alphanumeric
range. */

if (c < ESCAPES_FIRST || c > ESCAPES_LAST) {}  /* Definitely literal */

/* Otherwise, do a table lookup. Non-zero values need little processing here. A
positive value is a literal value for something like \n. A negative value is
the negation of one of the ESC_ macros that is passed back for handling by the
calling function. Some extra checking is needed for \N because only \N{U+dddd}
is supported. If the value is zero, further processing is handled below. */

else if ((i = escapes[c - ESCAPES_FIRST]) != 0)
  {
  if (i > 0)
    {
    c = (uint32_t)i;
    if (c == CHAR_CR && (extra_options & PCRE2_EXTRA_ESCAPED_CR_IS_LF) != 0)
      c = CHAR_LF;
    }
  else  /* Negative table entry */
    {
    escape = -i;                    /* Else return a special escape */
    if (cb != NULL && (escape == ESC_P || escape == ESC_p || escape == ESC_X))
      cb->external_flags |= PCRE2_HASBKPORX;   /* Note \P, \p, or \X */

    /* Perl supports \N{name} for character names and \N{U+dddd} for numerical
    Unicode code points, as well as plain \N for "not newline". PCRE does not
    support \N{name}. However, it does support quantification such as \N{2,3},
    so if \N{ is not followed by U+dddd we check for a quantifier. */

    if (escape == ESC_N && ptr < ptrend && *ptr == CHAR_LEFT_CURLY_BRACKET)
      {
      PCRE2_SPTR p = ptr + 1;

      /* \N{U+ can be handled by the \x{ code. However, this construction is
      not valid in EBCDIC environments because it specifies a Unicode
      character, not a codepoint in the local code. For example \N{U+0041}
      must be "A" in all environments. Also, in Perl, \N{U+ forces Unicode
      casing semantics for the entire pattern, so allow it only in UTF (i.e.
      Unicode) mode. */

      if (ptrend - p > 1 && *p == CHAR_U && p[1] == CHAR_PLUS)
        {
#ifdef EBCDIC
        *errorcodeptr = ERR93;
#else
        if (utf)
          {
          ptr = p + 1;
          escape = 0;   /* Not a fancy escape after all */
          goto COME_FROM_NU;
          }
        else *errorcodeptr = ERR93;
#endif
        }

      /* Give an error if what follows is not a quantifier, but don't override
      an error set by the quantifier reader (e.g. number overflow). */

      else
        {
        if (!read_repeat_counts(&p, ptrend, NULL, NULL, errorcodeptr) &&
             *errorcodeptr == 0)
          *errorcodeptr = ERR37;
        }
      }
    }
  }

/* Escapes that need further processing, including those that are unknown, have
a zero entry in the lookup table. When called from pcre2_substitute(), only \c,
\o, and \x are recognized (\u and \U can never appear as they are used for case
forcing). */

else
  {
  int s;
  PCRE2_SPTR oldptr;
  BOOL overflow;
  BOOL alt_bsux =
    ((options & PCRE2_ALT_BSUX) | (extra_options & PCRE2_EXTRA_ALT_BSUX)) != 0;

  /* Filter calls from pcre2_substitute(). */

  if (cb == NULL)
    {
    if (c != CHAR_c && c != CHAR_o && c != CHAR_x)
      {
      *errorcodeptr = ERR3;
      return 0;
      }
    alt_bsux = FALSE;   /* Do not modify \x handling */
    }

  switch (c)
    {
    /* A number of Perl escapes are not handled by PCRE. We give an explicit
    error. */

    case CHAR_F:
    case CHAR_l:
    case CHAR_L:
    *errorcodeptr = ERR37;
    break;

    /* \u is unrecognized when neither PCRE2_ALT_BSUX nor PCRE2_EXTRA_ALT_BSUX
    is set. Otherwise, \u must be followed by exactly four hex digits or, if
    PCRE2_EXTRA_ALT_BSUX is set, by any number of hex digits in braces.
    Otherwise it is a lowercase u letter. This gives some compatibility with
    ECMAScript (aka JavaScript). */

    case CHAR_u:
    if (!alt_bsux) *errorcodeptr = ERR37; else
      {
      uint32_t xc;

      if (ptr >= ptrend) break;
      if (*ptr == CHAR_LEFT_CURLY_BRACKET &&
          (extra_options & PCRE2_EXTRA_ALT_BSUX) != 0)
        {
        PCRE2_SPTR hptr = ptr + 1;
        cc = 0;

        while (hptr < ptrend && (xc = XDIGIT(*hptr)) != 0xff)
          {
          if ((cc & 0xf0000000) != 0)  /* Test for 32-bit overflow */
            {
            *errorcodeptr = ERR77;
            ptr = hptr;   /* Show where */
            break;        /* *hptr != } will cause another break below */
            }
          cc = (cc << 4) | xc;
          hptr++;
          }

        if (hptr == ptr + 1 ||   /* No hex digits */
            hptr >= ptrend ||    /* Hit end of input */
            *hptr != CHAR_RIGHT_CURLY_BRACKET)  /* No } terminator */
          break;         /* Hex escape not recognized */

        c = cc;          /* Accept the code point */
        ptr = hptr + 1;
        }

      else  /* Must be exactly 4 hex digits */
        {
        if (ptrend - ptr < 4) break;               /* Less than 4 chars */
        if ((cc = XDIGIT(ptr[0])) == 0xff) break;  /* Not a hex digit */
        if ((xc = XDIGIT(ptr[1])) == 0xff) break;  /* Not a hex digit */
        cc = (cc << 4) | xc;
        if ((xc = XDIGIT(ptr[2])) == 0xff) break;  /* Not a hex digit */
        cc = (cc << 4) | xc;
        if ((xc = XDIGIT(ptr[3])) == 0xff) break;  /* Not a hex digit */
        c = (cc << 4) | xc;
        ptr += 4;
        }

      if (utf)
        {
        if (c > 0x10ffffU) *errorcodeptr = ERR77;
        else
          if (c >= 0xd800 && c <= 0xdfff &&
              (extra_options & PCRE2_EXTRA_ALLOW_SURROGATE_ESCAPES) == 0)
                *errorcodeptr = ERR73;
        }
      else if (c > MAX_NON_UTF_CHAR) *errorcodeptr = ERR77;
      }
    break;

    /* \U is unrecognized unless PCRE2_ALT_BSUX or PCRE2_EXTRA_ALT_BSUX is set,
    in which case it is an upper case letter. */

    case CHAR_U:
    if (!alt_bsux) *errorcodeptr = ERR37;
    break;

    /* In a character class, \g is just a literal "g". Outside a character
    class, \g must be followed by one of a number of specific things:

    (1) A number, either plain or braced. If positive, it is an absolute
    backreference. If negative, it is a relative backreference. This is a Perl
    5.10 feature.

    (2) Perl 5.10 also supports \g{name} as a reference to a named group. This
    is part of Perl's movement towards a unified syntax for back references. As
    this is synonymous with \k{name}, we fudge it up by pretending it really
    was \k{name}.

    (3) For Oniguruma compatibility we also support \g followed by a name or a
    number either in angle brackets or in single quotes. However, these are
    (possibly recursive) subroutine calls, _not_ backreferences. We return
    the ESC_g code.

    Summary: Return a negative number for a numerical back reference, ESC_k for
    a named back reference, and ESC_g for a named or numbered subroutine call.
    */

    case CHAR_g:
    if (isclass) break;

    if (ptr >= ptrend)
      {
      *errorcodeptr = ERR57;
      break;
      }

    if (*ptr == CHAR_LESS_THAN_SIGN || *ptr == CHAR_APOSTROPHE)
      {
      escape = ESC_g;
      break;
      }

    /* If there is a brace delimiter, try to read a numerical reference. If
    there isn't one, assume we have a name and treat it as \k. */

    if (*ptr == CHAR_LEFT_CURLY_BRACKET)
      {
      PCRE2_SPTR p = ptr + 1;
      if (!read_number(&p, ptrend, cb->bracount, MAX_GROUP_NUMBER, ERR61, &s,
          errorcodeptr))
        {
        if (*errorcodeptr == 0) escape = ESC_k;  /* No number found */
        break;
        }
      if (p >= ptrend || *p != CHAR_RIGHT_CURLY_BRACKET)
        {
        *errorcodeptr = ERR57;
        break;
        }
      ptr = p + 1;
      }

    /* Read an undelimited number */

    else
      {
      if (!read_number(&ptr, ptrend, cb->bracount, MAX_GROUP_NUMBER, ERR61, &s,
          errorcodeptr))
        {
        if (*errorcodeptr == 0) *errorcodeptr = ERR57;  /* No number found */
        break;
        }
      }

    if (s <= 0)
      {
      *errorcodeptr = ERR15;
      break;
      }

    escape = -s;
    break;

    /* The handling of escape sequences consisting of a string of digits
    starting with one that is not zero is not straightforward. Perl has changed
    over the years. Nowadays \g{} for backreferences and \o{} for octal are
    recommended to avoid the ambiguities in the old syntax.

    Outside a character class, the digits are read as a decimal number. If the
    number is less than 10, or if there are that many previous extracting left
    brackets, it is a back reference. Otherwise, up to three octal digits are
    read to form an escaped character code. Thus \123 is likely to be octal 123
    (cf \0123, which is octal 012 followed by the literal 3).

    Inside a character class, \ followed by a digit is always either a literal
    8 or 9 or an octal number. */

    case CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4: case CHAR_5:
    case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:

    if (!isclass)
      {
      oldptr = ptr;
      ptr--;   /* Back to the digit */
      if (!read_number(&ptr, ptrend, -1, INT_MAX/10 - 1, ERR61, &s,
          errorcodeptr))
        break;

      /* \1 to \9 are always back references. \8x and \9x are too; \1x to \7x
      are octal escapes if there are not that many previous captures. */

      if (s < 10 || oldptr[-1] >= CHAR_8 || s <= (int)cb->bracount)
        {
        if (s > (int)MAX_GROUP_NUMBER) *errorcodeptr = ERR61;
          else escape = -s;     /* Indicates a back reference */
        break;
        }
      ptr = oldptr;      /* Put the pointer back and fall through */
      }

    /* Handle a digit following \ when the number is not a back reference, or
    we are within a character class. If the first digit is 8 or 9, Perl used to
    generate a binary zero and then treat the digit as a following literal. At
    least by Perl 5.18 this changed so as not to insert the binary zero. */

    if (c >= CHAR_8) break;

    /* Fall through */

    /* \0 always starts an octal number, but we may drop through to here with a
    larger first octal digit. The original code used just to take the least
    significant 8 bits of octal numbers (I think this is what early Perls used
    to do). Nowadays we allow for larger numbers in UTF-8 mode and 16-bit mode,
    but no more than 3 octal digits. */

    case CHAR_0:
    c -= CHAR_0;
    while(i++ < 2 && ptr < ptrend && *ptr >= CHAR_0 && *ptr <= CHAR_7)
        c = c * 8 + *ptr++ - CHAR_0;
#if PCRE2_CODE_UNIT_WIDTH == 8
    if (!utf && c > 0xff) *errorcodeptr = ERR51;
#endif
    break;

    /* \o is a relatively new Perl feature, supporting a more general way of
    specifying character codes in octal. The only supported form is \o{ddd}. */

    case CHAR_o:
    if (ptr >= ptrend || *ptr++ != CHAR_LEFT_CURLY_BRACKET)
      {
      ptr--;
      *errorcodeptr = ERR55;
      }
    else if (ptr >= ptrend || *ptr == CHAR_RIGHT_CURLY_BRACKET)
      *errorcodeptr = ERR78;
    else
      {
      c = 0;
      overflow = FALSE;
      while (ptr < ptrend && *ptr >= CHAR_0 && *ptr <= CHAR_7)
        {
        cc = *ptr++;
        if (c == 0 && cc == CHAR_0) continue;     /* Leading zeroes */
#if PCRE2_CODE_UNIT_WIDTH == 32
        if (c >= 0x20000000l) { overflow = TRUE; break; }
#endif
        c = (c << 3) + (cc - CHAR_0);
#if PCRE2_CODE_UNIT_WIDTH == 8
        if (c > (utf ? 0x10ffffU : 0xffU)) { overflow = TRUE; break; }
#elif PCRE2_CODE_UNIT_WIDTH == 16
        if (c > (utf ? 0x10ffffU : 0xffffU)) { overflow = TRUE; break; }
#elif PCRE2_CODE_UNIT_WIDTH == 32
        if (utf && c > 0x10ffffU) { overflow = TRUE; break; }
#endif
        }
      if (overflow)
        {
        while (ptr < ptrend && *ptr >= CHAR_0 && *ptr <= CHAR_7) ptr++;
        *errorcodeptr = ERR34;
        }
      else if (ptr < ptrend && *ptr++ == CHAR_RIGHT_CURLY_BRACKET)
        {
        if (utf && c >= 0xd800 && c <= 0xdfff &&
            (extra_options & PCRE2_EXTRA_ALLOW_SURROGATE_ESCAPES) == 0)
          {
          ptr--;
          *errorcodeptr = ERR73;
          }
        }
      else
        {
        ptr--;
        *errorcodeptr = ERR64;
        }
      }
    break;

    /* When PCRE2_ALT_BSUX or PCRE2_EXTRA_ALT_BSUX is set, \x must be followed
    by two hexadecimal digits. Otherwise it is a lowercase x letter. */

    case CHAR_x:
    if (alt_bsux)
      {
      uint32_t xc;
      if (ptrend - ptr < 2) break;               /* Less than 2 characters */
      if ((cc = XDIGIT(ptr[0])) == 0xff) break;  /* Not a hex digit */
      if ((xc = XDIGIT(ptr[1])) == 0xff) break;  /* Not a hex digit */
      c = (cc << 4) | xc;
      ptr += 2;
      }

    /* Handle \x in Perl's style. \x{ddd} is a character code which can be
    greater than 0xff in UTF-8 or non-8bit mode, but only if the ddd are hex
    digits. If not, { used to be treated as a data character. However, Perl
    seems to read hex digits up to the first non-such, and ignore the rest, so
    that, for example \x{zz} matches a binary zero. This seems crazy, so PCRE
    now gives an error. */

    else
      {
      if (ptr < ptrend && *ptr == CHAR_LEFT_CURLY_BRACKET)
        {
#ifndef EBCDIC
        COME_FROM_NU:
#endif
        if (++ptr >= ptrend || *ptr == CHAR_RIGHT_CURLY_BRACKET)
          {
          *errorcodeptr = ERR78;
          break;
          }
        c = 0;
        overflow = FALSE;

        while (ptr < ptrend && (cc = XDIGIT(*ptr)) != 0xff)
          {
          ptr++;
          if (c == 0 && cc == 0) continue;   /* Leading zeroes */
#if PCRE2_CODE_UNIT_WIDTH == 32
          if (c >= 0x10000000l) { overflow = TRUE; break; }
#endif
          c = (c << 4) | cc;
          if ((utf && c > 0x10ffffU) || (!utf && c > MAX_NON_UTF_CHAR))
            {
            overflow = TRUE;
            break;
            }
          }

        if (overflow)
          {
          while (ptr < ptrend && XDIGIT(*ptr) != 0xff) ptr++;
          *errorcodeptr = ERR34;
          }
        else if (ptr < ptrend && *ptr++ == CHAR_RIGHT_CURLY_BRACKET)
          {
          if (utf && c >= 0xd800 && c <= 0xdfff &&
              (extra_options & PCRE2_EXTRA_ALLOW_SURROGATE_ESCAPES) == 0)
            {
            ptr--;
            *errorcodeptr = ERR73;
            }
          }

        /* If the sequence of hex digits does not end with '}', give an error.
        We used just to recognize this construct and fall through to the normal
        \x handling, but nowadays Perl gives an error, which seems much more
        sensible, so we do too. */

        else
          {
          ptr--;
          *errorcodeptr = ERR67;
          }
        }   /* End of \x{} processing */

      /* Read a up to two hex digits after \x */

      else
        {
        c = 0;
        if (ptr >= ptrend || (cc = XDIGIT(*ptr)) == 0xff) break;  /* Not a hex digit */
        ptr++;
        c = cc;
        if (ptr >= ptrend || (cc = XDIGIT(*ptr)) == 0xff) break;  /* Not a hex digit */
        ptr++;
        c = (c << 4) | cc;
        }     /* End of \xdd handling */
      }       /* End of Perl-style \x handling */
    break;

    /* The handling of \c is different in ASCII and EBCDIC environments. In an
    ASCII (or Unicode) environment, an error is given if the character
    following \c is not a printable ASCII character. Otherwise, the following
    character is upper-cased if it is a letter, and after that the 0x40 bit is
    flipped. The result is the value of the escape.

    In an EBCDIC environment the handling of \c is compatible with the
    specification in the perlebcdic document. The following character must be
    a letter or one of small number of special characters. These provide a
    means of defining the character values 0-31.

    For testing the EBCDIC handling of \c in an ASCII environment, recognize
    the EBCDIC value of 'c' explicitly. */

#if defined EBCDIC && 'a' != 0x81
    case 0x83:
#else
    case CHAR_c:
#endif
    if (ptr >= ptrend)
      {
      *errorcodeptr = ERR2;
      break;
      }
    c = *ptr;
    if (c >= CHAR_a && c <= CHAR_z) c = UPPER_CASE(c);

    /* Handle \c in an ASCII/Unicode environment. */

#ifndef EBCDIC    /* ASCII/UTF-8 coding */
    if (c < 32 || c > 126)  /* Excludes all non-printable ASCII */
      {
      *errorcodeptr = ERR68;
      break;
      }
    c ^= 0x40;

    /* Handle \c in an EBCDIC environment. The special case \c? is converted to
    255 (0xff) or 95 (0x5f) if other characters suggest we are using the
    POSIX-BC encoding. (This is the way Perl indicates that it handles \c?.)
    The other valid sequences correspond to a list of specific characters. */

#else
    if (c == CHAR_QUESTION_MARK)
      c = ('\\' == 188 && '`' == 74)? 0x5f : 0xff;
    else
      {
      for (i = 0; i < 32; i++)
        {
        if (c == ebcdic_escape_c[i]) break;
        }
      if (i < 32) c = i; else *errorcodeptr = ERR68;
      }
#endif  /* EBCDIC */

    ptr++;
    break;

    /* Any other alphanumeric following \ is an error. Perl gives an error only
    if in warning mode, but PCRE doesn't have a warning mode. */

    default:
    *errorcodeptr = ERR3;
    *ptrptr = ptr - 1;     /* Point to the character at fault */
    return 0;
    }
  }

/* Set the pointer to the next character before returning. */

*ptrptr = ptr;
*chptr = c;
return escape;
}



#ifdef SUPPORT_UNICODE
/*************************************************
*               Handle \P and \p                 *
*************************************************/

/* This function is called after \P or \p has been encountered, provided that
PCRE2 is compiled with support for UTF and Unicode properties. On entry, the
contents of ptrptr are pointing after the P or p. On exit, it is left pointing
after the final code unit of the escape sequence.

Arguments:
  ptrptr         the pattern position pointer
  negptr         a boolean that is set TRUE for negation else FALSE
  ptypeptr       an unsigned int that is set to the type value
  pdataptr       an unsigned int that is set to the detailed property value
  errorcodeptr   the error code variable
  cb             the compile data

Returns:         TRUE if the type value was found, or FALSE for an invalid type
*/

static BOOL
get_ucp(PCRE2_SPTR *ptrptr, BOOL *negptr, uint16_t *ptypeptr,
  uint16_t *pdataptr, int *errorcodeptr, compile_block *cb)
{
PCRE2_UCHAR c;
PCRE2_SIZE i, bot, top;
PCRE2_SPTR ptr = *ptrptr;
PCRE2_UCHAR name[32];

if (ptr >= cb->end_pattern) goto ERROR_RETURN;
c = *ptr++;
*negptr = FALSE;

/* \P or \p can be followed by a name in {}, optionally preceded by ^ for
negation. */

if (c == CHAR_LEFT_CURLY_BRACKET)
  {
  if (ptr >= cb->end_pattern) goto ERROR_RETURN;
  if (*ptr == CHAR_CIRCUMFLEX_ACCENT)
    {
    *negptr = TRUE;
    ptr++;
    }
  for (i = 0; i < (int)(sizeof(name) / sizeof(PCRE2_UCHAR)) - 1; i++)
    {
    if (ptr >= cb->end_pattern) goto ERROR_RETURN;
    c = *ptr++;
    if (c == CHAR_NUL) goto ERROR_RETURN;
    if (c == CHAR_RIGHT_CURLY_BRACKET) break;
    name[i] = c;
    }
  if (c != CHAR_RIGHT_CURLY_BRACKET) goto ERROR_RETURN;
  name[i] = 0;
  }

/* Otherwise there is just one following character, which must be an ASCII
letter. */

else if (MAX_255(c) && (cb->ctypes[c] & ctype_letter) != 0)
  {
  name[0] = c;
  name[1] = 0;
  }
else goto ERROR_RETURN;

*ptrptr = ptr;

/* Search for a recognized property name using binary chop. */

bot = 0;
top = PRIV(utt_size);

while (bot < top)
  {
  int r;
  i = (bot + top) >> 1;
  r = PRIV(strcmp_c8)(name, PRIV(utt_names) + PRIV(utt)[i].name_offset);
  if (r == 0)
    {
    *ptypeptr = PRIV(utt)[i].type;
    *pdataptr = PRIV(utt)[i].value;
    return TRUE;
    }
  if (r > 0) bot = i + 1; else top = i;
  }
*errorcodeptr = ERR47;   /* Unrecognized name */
return FALSE;

ERROR_RETURN:            /* Malformed \P or \p */
*errorcodeptr = ERR46;
*ptrptr = ptr;
return FALSE;
}
#endif



/*************************************************
*           Check for POSIX class syntax         *
*************************************************/

/* This function is called when the sequence "[:" or "[." or "[=" is
encountered in a character class. It checks whether this is followed by a
sequence of characters terminated by a matching ":]" or ".]" or "=]". If we
reach an unescaped ']' without the special preceding character, return FALSE.

Originally, this function only recognized a sequence of letters between the
terminators, but it seems that Perl recognizes any sequence of characters,
though of course unknown POSIX names are subsequently rejected. Perl gives an
"Unknown POSIX class" error for [:f\oo:] for example, where previously PCRE
didn't consider this to be a POSIX class. Likewise for [:1234:].

The problem in trying to be exactly like Perl is in the handling of escapes. We
have to be sure that [abc[:x\]pqr] is *not* treated as containing a POSIX
class, but [abc[:x\]pqr:]] is (so that an error can be generated). The code
below handles the special cases \\ and \], but does not try to do any other
escape processing. This makes it different from Perl for cases such as
[:l\ower:] where Perl recognizes it as the POSIX class "lower" but PCRE does
not recognize "l\ower". This is a lesser evil than not diagnosing bad classes
when Perl does, I think.

A user pointed out that PCRE was rejecting [:a[:digit:]] whereas Perl was not.
It seems that the appearance of a nested POSIX class supersedes an apparent
external class. For example, [:a[:digit:]b:] matches "a", "b", ":", or
a digit. This is handled by returning FALSE if the start of a new group with
the same terminator is encountered, since the next closing sequence must close
the nested group, not the outer one.

In Perl, unescaped square brackets may also appear as part of class names. For
example, [:a[:abc]b:] gives unknown POSIX class "[:abc]b:]". However, for
[:a[:abc]b][b:] it gives unknown POSIX class "[:abc]b][b:]", which does not
seem right at all. PCRE does not allow closing square brackets in POSIX class
names.

Arguments:
  ptr      pointer to the character after the initial [ (colon, dot, equals)
  ptrend   pointer to the end of the pattern
  endptr   where to return a pointer to the terminating ':', '.', or '='

Returns:   TRUE or FALSE
*/

static BOOL
check_posix_syntax(PCRE2_SPTR ptr, PCRE2_SPTR ptrend, PCRE2_SPTR *endptr)
{
PCRE2_UCHAR terminator;  /* Don't combine these lines; the Solaris cc */
terminator = *ptr++;     /* compiler warns about "non-constant" initializer. */

for (; ptrend - ptr >= 2; ptr++)
  {
  if (*ptr == CHAR_BACKSLASH &&
      (ptr[1] == CHAR_RIGHT_SQUARE_BRACKET || ptr[1] == CHAR_BACKSLASH))
    ptr++;

  else if ((*ptr == CHAR_LEFT_SQUARE_BRACKET && ptr[1] == terminator) ||
            *ptr == CHAR_RIGHT_SQUARE_BRACKET) return FALSE;

  else if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
    {
    *endptr = ptr;
    return TRUE;
    }
  }

return FALSE;
}



/*************************************************
*          Check POSIX class name                *
*************************************************/

/* This function is called to check the name given in a POSIX-style class entry
such as [:alnum:].

Arguments:
  ptr        points to the first letter
  len        the length of the name

Returns:     a value representing the name, or -1 if unknown
*/

static int
check_posix_name(PCRE2_SPTR ptr, int len)
{
const char *pn = posix_names;
int yield = 0;
while (posix_name_lengths[yield] != 0)
  {
  if (len == posix_name_lengths[yield] &&
    PRIV(strncmp_c8)(ptr, pn, (unsigned int)len) == 0) return yield;
  pn += posix_name_lengths[yield] + 1;
  yield++;
  }
return -1;
}



/*************************************************
*       Read a subpattern or VERB name           *
*************************************************/

/* This function is called from parse_regex() below whenever it needs to read
the name of a subpattern or a (*VERB) or an (*alpha_assertion). The initial
pointer must be to the character before the name. If that character is '*' we
are reading a verb or alpha assertion name. The pointer is updated to point
after the name, for a VERB or alpha assertion name, or after tha name's
terminator for a subpattern name. Returning both the offset and the name
pointer is redundant information, but some callers use one and some the other,
so it is simplest just to return both.

Arguments:
  ptrptr      points to the character pointer variable
  ptrend      points to the end of the input string
  utf         true if the input is UTF-encoded
  terminator  the terminator of a subpattern name must be this
  offsetptr   where to put the offset from the start of the pattern
  nameptr     where to put a pointer to the name in the input
  namelenptr  where to put the length of the name
  errcodeptr  where to put an error code
  cb          pointer to the compile data block

Returns:    TRUE if a name was read
            FALSE otherwise, with error code set
*/

static BOOL
read_name(PCRE2_SPTR *ptrptr, PCRE2_SPTR ptrend, BOOL utf, uint32_t terminator,
  PCRE2_SIZE *offsetptr, PCRE2_SPTR *nameptr, uint32_t *namelenptr,
  int *errorcodeptr, compile_block *cb)
{
PCRE2_SPTR ptr = *ptrptr;
BOOL is_group = (*ptr != CHAR_ASTERISK);

if (++ptr >= ptrend)               /* No characters in name */
  {
  *errorcodeptr = is_group? ERR62: /* Subpattern name expected */
                            ERR60; /* Verb not recognized or malformed */
  goto FAILED;
  }

*nameptr = ptr;
*offsetptr = (PCRE2_SIZE)(ptr - cb->start_pattern);

/* In UTF mode, a group name may contain letters and decimal digits as defined
by Unicode properties, and underscores, but must not start with a digit. */

#ifdef SUPPORT_UNICODE
if (utf && is_group)
  {
  uint32_t c, type;

  GETCHAR(c, ptr);
  type = UCD_CHARTYPE(c);

  if (type == ucp_Nd)
    {
    *errorcodeptr = ERR44;
    goto FAILED;
    }

  for(;;)
    {
    if (type != ucp_Nd && PRIV(ucp_gentype)[type] != ucp_L &&
        c != CHAR_UNDERSCORE) break;
    ptr++;
    FORWARDCHARTEST(ptr, ptrend);
    if (ptr >= ptrend) break;
    GETCHAR(c, ptr);
    type = UCD_CHARTYPE(c);
    }
  }
else
#else
(void)utf;  /* Avoid compiler warning */
#endif      /* SUPPORT_UNICODE */

/* Handle non-group names and group names in non-UTF modes. A group name must
not start with a digit. If either of the others start with a digit it just
won't be recognized. */

  {
  if (is_group && IS_DIGIT(*ptr))
    {
    *errorcodeptr = ERR44;
    goto FAILED;
    }

  while (ptr < ptrend && MAX_255(*ptr) && (cb->ctypes[*ptr] & ctype_word) != 0)
    {
    ptr++;
    }
  }

/* Check name length */

if (ptr > *nameptr + MAX_NAME_SIZE)
  {
  *errorcodeptr = ERR48;
  goto FAILED;
  }
*namelenptr = ptr - *nameptr;

/* Subpattern names must not be empty, and their terminator is checked here.
(What follows a verb or alpha assertion name is checked separately.) */

if (is_group)
  {
  if (ptr == *nameptr)
    {
    *errorcodeptr = ERR62;   /* Subpattern name expected */
    goto FAILED;
    }
  if (ptr >= ptrend || *ptr != (PCRE2_UCHAR)terminator)
    {
    *errorcodeptr = ERR42;
    goto FAILED;
    }
  ptr++;
  }

*ptrptr = ptr;
return TRUE;

FAILED:
*ptrptr = ptr;
return FALSE;
}



/*************************************************
*          Manage callouts at start of cycle     *
*************************************************/

/* At the start of a new item in parse_regex() we are able to record the
details of the previous item in a prior callout, and also to set up an
automatic callout if enabled. Avoid having two adjacent automatic callouts,
which would otherwise happen for items such as \Q that contribute nothing to
the parsed pattern.

Arguments:
  ptr              current pattern pointer
  pcalloutptr      points to a pointer to previous callout, or NULL
  auto_callout     TRUE if auto_callouts are enabled
  parsed_pattern   the parsed pattern pointer
  cb               compile block

Returns: possibly updated parsed_pattern pointer.
*/

static uint32_t *
manage_callouts(PCRE2_SPTR ptr, uint32_t **pcalloutptr, BOOL auto_callout,
  uint32_t *parsed_pattern, compile_block *cb)
{
uint32_t *previous_callout = *pcalloutptr;

if (previous_callout != NULL) previous_callout[2] = (uint32_t)(ptr -
  cb->start_pattern - (PCRE2_SIZE)previous_callout[1]);

if (!auto_callout) previous_callout = NULL; else
  {
  if (previous_callout == NULL ||
      previous_callout != parsed_pattern - 4 ||
      previous_callout[3] != 255)
    {
    previous_callout = parsed_pattern;  /* Set up new automatic callout */
    parsed_pattern += 4;
    previous_callout[0] = META_CALLOUT_NUMBER;
    previous_callout[2] = 0;
    previous_callout[3] = 255;
    }
  previous_callout[1] = (uint32_t)(ptr - cb->start_pattern);
  }

*pcalloutptr = previous_callout;
return parsed_pattern;
}



/*************************************************
*      Parse regex and identify named groups     *
*************************************************/

/* This function is called first of all. It scans the pattern and does two
things: (1) It identifies capturing groups and makes a table of named capturing
groups so that information about them is fully available to both the compiling
scans. (2) It writes a parsed version of the pattern with comments omitted and
escapes processed into the parsed_pattern vector.

Arguments:
  ptr             points to the start of the pattern
  options         compiling dynamic options (may change during the scan)
  has_lookbehind  points to a boolean, set TRUE if a lookbehind is found
  cb              pointer to the compile data block

Returns:   zero on success or a non-zero error code, with the
             error offset placed in the cb field
*/

/* A structure and some flags for dealing with nested groups. */

typedef struct nest_save {
  uint16_t  nest_depth;
  uint16_t  reset_group;
  uint16_t  max_group;
  uint16_t  flags;
  uint32_t  options;
} nest_save;

#define NSF_RESET          0x0001u
#define NSF_CONDASSERT     0x0002u
#define NSF_ATOMICSR       0x0004u

/* Options that are changeable within the pattern must be tracked during
parsing. Some (e.g. PCRE2_EXTENDED) are implemented entirely during parsing,
but all must be tracked so that META_OPTIONS items set the correct values for
the main compiling phase. */

#define PARSE_TRACKED_OPTIONS (PCRE2_CASELESS|PCRE2_DOTALL|PCRE2_DUPNAMES| \
  PCRE2_EXTENDED|PCRE2_EXTENDED_MORE|PCRE2_MULTILINE|PCRE2_NO_AUTO_CAPTURE| \
  PCRE2_UNGREEDY)

/* States used for analyzing ranges in character classes. The two OK values
must be last. */

enum { RANGE_NO, RANGE_STARTED, RANGE_OK_ESCAPED, RANGE_OK_LITERAL };

/* Only in 32-bit mode can there be literals > META_END. A macro encapsulates
the storing of literal values in the main parsed pattern, where they can always
be quantified. */

#if PCRE2_CODE_UNIT_WIDTH == 32
#define PARSED_LITERAL(c, p) \
  { \
  if (c >= META_END) *p++ = META_BIGVALUE; \
  *p++ = c; \
  okquantifier = TRUE; \
  }
#else
#define PARSED_LITERAL(c, p) *p++ = c; okquantifier = TRUE;
#endif

/* Here's the actual function. */

static int parse_regex(PCRE2_SPTR ptr, uint32_t options, BOOL *has_lookbehind,
  compile_block *cb)
{
uint32_t c;
uint32_t delimiter;
uint32_t namelen;
uint32_t class_range_state;
uint32_t *verblengthptr = NULL;     /* Value avoids compiler warning */
uint32_t *verbstartptr = NULL;
uint32_t *previous_callout = NULL;
uint32_t *parsed_pattern = cb->parsed_pattern;
uint32_t *parsed_pattern_end = cb->parsed_pattern_end;
uint32_t meta_quantifier = 0;
uint32_t add_after_mark = 0;
uint32_t extra_options = cb->cx->extra_options;
uint16_t nest_depth = 0;
int after_manual_callout = 0;
int expect_cond_assert = 0;
int errorcode = 0;
int escape;
int i;
BOOL inescq = FALSE;
BOOL inverbname = FALSE;
BOOL utf = (options & PCRE2_UTF) != 0;
BOOL auto_callout = (options & PCRE2_AUTO_CALLOUT) != 0;
BOOL isdupname;
BOOL negate_class;
BOOL okquantifier = FALSE;
PCRE2_SPTR thisptr;
PCRE2_SPTR name;
PCRE2_SPTR ptrend = cb->end_pattern;
PCRE2_SPTR verbnamestart = NULL;    /* Value avoids compiler warning */
named_group *ng;
nest_save *top_nest, *end_nests;

/* Insert leading items for word and line matching (features provided for the
benefit of pcre2grep). */

if ((extra_options & PCRE2_EXTRA_MATCH_LINE) != 0)
  {
  *parsed_pattern++ = META_CIRCUMFLEX;
  *parsed_pattern++ = META_NOCAPTURE;
  }
else if ((extra_options & PCRE2_EXTRA_MATCH_WORD) != 0)
  {
  *parsed_pattern++ = META_ESCAPE + ESC_b;
  *parsed_pattern++ = META_NOCAPTURE;
  }

/* If the pattern is actually a literal string, process it separately to avoid
cluttering up the main loop. */

if ((options & PCRE2_LITERAL) != 0)
  {
  while (ptr < ptrend)
    {
    if (parsed_pattern >= parsed_pattern_end)
      {
      errorcode = ERR63;  /* Internal error (parsed pattern overflow) */
      goto FAILED;
      }
    thisptr = ptr;
    GETCHARINCTEST(c, ptr);
    if (auto_callout)
      parsed_pattern = manage_callouts(thisptr, &previous_callout,
        auto_callout, parsed_pattern, cb);
    PARSED_LITERAL(c, parsed_pattern);
    }
  goto PARSED_END;
  }

/* Process a real regex which may contain meta-characters. */

top_nest = NULL;
end_nests = (nest_save *)(cb->start_workspace + cb->workspace_size);

/* The size of the nest_save structure might not be a factor of the size of the
workspace. Therefore we must round down end_nests so as to correctly avoid
creating a nest_save that spans the end of the workspace. */

end_nests = (nest_save *)((char *)end_nests -
  ((cb->workspace_size * sizeof(PCRE2_UCHAR)) % sizeof(nest_save)));

/* PCRE2_EXTENDED_MORE implies PCRE2_EXTENDED */

if ((options & PCRE2_EXTENDED_MORE) != 0) options |= PCRE2_EXTENDED;

/* Now scan the pattern */

while (ptr < ptrend)
  {
  int prev_expect_cond_assert;
  uint32_t min_repeat, max_repeat;
  uint32_t set, unset, *optset;
  uint32_t terminator;
  uint32_t prev_meta_quantifier;
  BOOL prev_okquantifier;
  PCRE2_SPTR tempptr;
  PCRE2_SIZE offset;

  if (parsed_pattern >= parsed_pattern_end)
    {
    errorcode = ERR63;  /* Internal error (parsed pattern overflow) */
    goto FAILED;
    }

  if (nest_depth > cb->cx->parens_nest_limit)
    {
    errorcode = ERR19;
    goto FAILED;        /* Parentheses too deeply nested */
    }

  /* Get next input character, save its position for callout handling. */

  thisptr = ptr;
  GETCHARINCTEST(c, ptr);

  /* Copy quoted literals until \E, allowing for the possibility of automatic
  callouts, except when processing a (*VERB) "name".  */

  if (inescq)
    {
    if (c == CHAR_BACKSLASH && ptr < ptrend && *ptr == CHAR_E)
      {
      inescq = FALSE;
      ptr++;   /* Skip E */
      }
    else
      {
      if (expect_cond_assert > 0)   /* A literal is not allowed if we are */
        {                           /* expecting a conditional assertion, */
        ptr--;                      /* but an empty \Q\E sequence is OK.  */
        errorcode = ERR28;
        goto FAILED;
        }
      if (inverbname)
        {                          /* Don't use PARSED_LITERAL() because it */
#if PCRE2_CODE_UNIT_WIDTH == 32    /* sets okquantifier. */
        if (c >= META_END) *parsed_pattern++ = META_BIGVALUE;
#endif
        *parsed_pattern++ = c;
        }
      else
        {
        if (after_manual_callout-- <= 0)
          parsed_pattern = manage_callouts(thisptr, &previous_callout,
            auto_callout, parsed_pattern, cb);
        PARSED_LITERAL(c, parsed_pattern);
        }
      meta_quantifier = 0;
      }
    continue;  /* Next character */
    }

  /* If we are processing the "name" part of a (*VERB:NAME) item, all
  characters up to the closing parenthesis are literals except when
  PCRE2_ALT_VERBNAMES is set. That causes backslash interpretation, but only \Q
  and \E and escaped characters are allowed (no character types such as \d). If
  PCRE2_EXTENDED is also set, we must ignore white space and # comments. Do
  this by not entering the special (*VERB:NAME) processing - they are then
  picked up below. Note that c is a character, not a code unit, so we must not
  use MAX_255 to test its size because MAX_255 tests code units and is assumed
  TRUE in 8-bit mode. */

  if (inverbname &&
       (
        /* EITHER: not both options set */
        ((options & (PCRE2_EXTENDED | PCRE2_ALT_VERBNAMES)) !=
                    (PCRE2_EXTENDED | PCRE2_ALT_VERBNAMES)) ||
#ifdef SUPPORT_UNICODE
        /* OR: character > 255 AND not Unicode Pattern White Space */
        (c > 255 && (c|1) != 0x200f && (c|1) != 0x2029) ||
#endif
        /* OR: not a # comment or isspace() white space */
        (c < 256 && c != CHAR_NUMBER_SIGN && (cb->ctypes[c] & ctype_space) == 0
#ifdef SUPPORT_UNICODE
        /* and not CHAR_NEL when Unicode is supported */
          && c != CHAR_NEL
#endif
       )))
    {
    PCRE2_SIZE verbnamelength;

    switch(c)
      {
      default:                     /* Don't use PARSED_LITERAL() because it */
#if PCRE2_CODE_UNIT_WIDTH == 32    /* sets okquantifier. */
      if (c >= META_END) *parsed_pattern++ = META_BIGVALUE;
#endif
      *parsed_pattern++ = c;
      break;

      case CHAR_RIGHT_PARENTHESIS:
      inverbname = FALSE;
      /* This is the length in characters */
      verbnamelength = (PCRE2_SIZE)(parsed_pattern - verblengthptr - 1);
      /* But the limit on the length is in code units */
      if (ptr - verbnamestart - 1 > (int)MAX_MARK)
        {
        ptr--;
        errorcode = ERR76;
        goto FAILED;
        }
      *verblengthptr = (uint32_t)verbnamelength;

      /* If this name was on a verb such as (*ACCEPT) which does not continue,
      a (*MARK) was generated for the name. We now add the original verb as the
      next item. */

      if (add_after_mark != 0)
        {
        *parsed_pattern++ = add_after_mark;
        add_after_mark = 0;
        }
      break;

      case CHAR_BACKSLASH:
      if ((options & PCRE2_ALT_VERBNAMES) != 0)
        {
        escape = PRIV(check_escape)(&ptr, ptrend, &c, &errorcode, options,
          cb->cx->extra_options, FALSE, cb);
        if (errorcode != 0) goto FAILED;
        }
      else escape = 0;   /* Treat all as literal */

      switch(escape)
        {
        case 0:                    /* Don't use PARSED_LITERAL() because it */
#if PCRE2_CODE_UNIT_WIDTH == 32    /* sets okquantifier. */
        if (c >= META_END) *parsed_pattern++ = META_BIGVALUE;
#endif
        *parsed_pattern++ = c;
        break;

        case ESC_Q:
        inescq = TRUE;
        break;

        case ESC_E:           /* Ignore */
        break;

        default:
        errorcode = ERR40;    /* Invalid in verb name */
        goto FAILED;
        }
      }
    continue;   /* Next character in pattern */
    }

  /* Not a verb name character. At this point we must process everything that
  must not change the quantification state. This is mainly comments, but we
  handle \Q and \E here as well, so that an item such as A\Q\E+ is treated as
  A+, as in Perl. An isolated \E is ignored. */

  if (c == CHAR_BACKSLASH && ptr < ptrend)
    {
    if (*ptr == CHAR_Q || *ptr == CHAR_E)
      {
      inescq = *ptr == CHAR_Q;
      ptr++;
      continue;
      }
    }

  /* Skip over whitespace and # comments in extended mode. Note that c is a
  character, not a code unit, so we must not use MAX_255 to test its size
  because MAX_255 tests code units and is assumed TRUE in 8-bit mode. The
  whitespace characters are those designated as "Pattern White Space" by
  Unicode, which are the isspace() characters plus CHAR_NEL (newline), which is
  U+0085 in Unicode, plus U+200E, U+200F, U+2028, and U+2029. These are a
  subset of space characters that match \h and \v. */

  if ((options & PCRE2_EXTENDED) != 0)
    {
    if (c < 256 && (cb->ctypes[c] & ctype_space) != 0) continue;
#ifdef SUPPORT_UNICODE
    if (c == CHAR_NEL || (c|1) == 0x200f || (c|1) == 0x2029) continue;
#endif
    if (c == CHAR_NUMBER_SIGN)
      {
      while (ptr < ptrend)
        {
        if (IS_NEWLINE(ptr))      /* For non-fixed-length newline cases, */
          {                       /* IS_NEWLINE sets cb->nllen. */
          ptr += cb->nllen;
          break;
          }
        ptr++;
#ifdef SUPPORT_UNICODE
        if (utf) FORWARDCHARTEST(ptr, ptrend);
#endif
        }
      continue;  /* Next character in pattern */
      }
    }

  /* Skip over bracketed comments */

  if (c == CHAR_LEFT_PARENTHESIS && ptrend - ptr >= 2 &&
      ptr[0] == CHAR_QUESTION_MARK && ptr[1] == CHAR_NUMBER_SIGN)
    {
    while (++ptr < ptrend && *ptr != CHAR_RIGHT_PARENTHESIS);
    if (ptr >= ptrend)
      {
      errorcode = ERR18;  /* A special error for missing ) in a comment */
      goto FAILED;        /* to make it easier to debug. */
      }
    ptr++;
    continue;  /* Next character in pattern */
    }

  /* If the next item is not a quantifier, fill in length of any previous
  callout and create an auto callout if required. */

  if (c != CHAR_ASTERISK && c != CHAR_PLUS && c != CHAR_QUESTION_MARK &&
       (c != CHAR_LEFT_CURLY_BRACKET ||
         (tempptr = ptr,
         !read_repeat_counts(&tempptr, ptrend, NULL, NULL, &errorcode))))
    {
    if (after_manual_callout-- <= 0)
      parsed_pattern = manage_callouts(thisptr, &previous_callout, auto_callout,
        parsed_pattern, cb);
    }

  /* If expect_cond_assert is 2, we have just passed (?( and are expecting an
  assertion, possibly preceded by a callout. If the value is 1, we have just
  had the callout and expect an assertion. There must be at least 3 more
  characters in all cases. When expect_cond_assert is 2, we know that the
  current character is an opening parenthesis, as otherwise we wouldn't be
  here. However, when it is 1, we need to check, and it's easiest just to check
  always. Note that expect_cond_assert may be negative, since all callouts just
  decrement it. */

  if (expect_cond_assert > 0)
    {
    BOOL ok = c == CHAR_LEFT_PARENTHESIS && ptrend - ptr >= 3 &&
              (ptr[0] == CHAR_QUESTION_MARK || ptr[0] == CHAR_ASTERISK);
    if (ok)
      {
      if (ptr[0] == CHAR_ASTERISK)  /* New alpha assertion format, possibly */
        {
        ok = MAX_255(ptr[1]) && (cb->ctypes[ptr[1]] & ctype_lcletter) != 0;
        }
      else switch(ptr[1])  /* Traditional symbolic format */
        {
        case CHAR_C:
        ok = expect_cond_assert == 2;
        break;

        case CHAR_EQUALS_SIGN:
        case CHAR_EXCLAMATION_MARK:
        break;

        case CHAR_LESS_THAN_SIGN:
        ok = ptr[2] == CHAR_EQUALS_SIGN || ptr[2] == CHAR_EXCLAMATION_MARK;
        break;

        default:
        ok = FALSE;
        }
      }

    if (!ok)
      {
      ptr--;   /* Adjust error offset */
      errorcode = ERR28;
      goto FAILED;
      }
    }

  /* Remember whether we are expecting a conditional assertion, and set the
  default for this item. */

  prev_expect_cond_assert = expect_cond_assert;
  expect_cond_assert = 0;

  /* Remember quantification status for the previous significant item, then set
  default for this item. */

  prev_okquantifier = okquantifier;
  prev_meta_quantifier = meta_quantifier;
  okquantifier = FALSE;
  meta_quantifier = 0;

  /* If the previous significant item was a quantifier, adjust the parsed code
  if there is a following modifier. The base meta value is always followed by
  the PLUS and QUERY values, in that order. We do this here rather than after
  reading a quantifier so that intervening comments and /x whitespace can be
  ignored without having to replicate code. */

  if (prev_meta_quantifier != 0 && (c == CHAR_QUESTION_MARK || c == CHAR_PLUS))
    {
    parsed_pattern[(prev_meta_quantifier == META_MINMAX)? -3 : -1] =
      prev_meta_quantifier + ((c == CHAR_QUESTION_MARK)?
        0x00020000u : 0x00010000u);
    continue;  /* Next character in pattern */
    }


  /* Process the next item in the main part of a pattern. */

  switch(c)
    {
    default:              /* Non-special character */
    PARSED_LITERAL(c, parsed_pattern);
    break;


    /* ---- Escape sequence ---- */

    case CHAR_BACKSLASH:
    tempptr = ptr;
    escape = PRIV(check_escape)(&ptr, ptrend, &c, &errorcode, options,
      cb->cx->extra_options, FALSE, cb);
    if (errorcode != 0)
      {
      ESCAPE_FAILED:
      if ((extra_options & PCRE2_EXTRA_BAD_ESCAPE_IS_LITERAL) == 0)
        goto FAILED;
      ptr = tempptr;
      if (ptr >= ptrend) c = CHAR_BACKSLASH; else
        {
        GETCHARINCTEST(c, ptr);   /* Get character value, increment pointer */
        }
      escape = 0;                 /* Treat as literal character */
      }

    /* The escape was a data escape or literal character. */

    if (escape == 0)
      {
      PARSED_LITERAL(c, parsed_pattern);
      }

    /* The escape was a back (or forward) reference. We keep the offset in
    order to give a more useful diagnostic for a bad forward reference. For
    references to groups numbered less than 10 we can't use more than two items
    in parsed_pattern because they may be just two characters in the input (and
    in a 64-bit world an offset may need two elements). So for them, the offset
    of the first occurrent is held in a special vector. */

    else if (escape < 0)
      {
      offset = (PCRE2_SIZE)(ptr - cb->start_pattern - 1);
      escape = -escape;
      *parsed_pattern++ = META_BACKREF | (uint32_t)escape;
      if (escape < 10)
        {
        if (cb->small_ref_offset[escape] == PCRE2_UNSET)
          cb->small_ref_offset[escape] = offset;
        }
      else
        {
        PUTOFFSET(offset, parsed_pattern);
        }
      okquantifier = TRUE;
      }

    /* The escape was a character class such as \d etc. or other special
    escape indicator such as \A or \X. Most of them generate just a single
    parsed item, but \P and \p are followed by a 16-bit type and a 16-bit
    value. They are supported only when Unicode is available. The type and
    value are packed into a single 32-bit value so that the whole sequences
    uses only two elements in the parsed_vector. This is because the same
    coding is used if \d (for example) is turned into \p{Nd} when PCRE2_UCP is
    set.

    There are also some cases where the escape sequence is followed by a name:
    \k{name}, \k<name>, and \k'name' are backreferences by name, and \g<name>
    and \g'name' are subroutine calls by name; \g{name} is a synonym for
    \k{name}. Note that \g<number> and \g'number' are handled by check_escape()
    and returned as a negative value (handled above). A name is coded as an
    offset into the pattern and a length. */

    else switch (escape)
      {
      case ESC_C:
#ifdef NEVER_BACKSLASH_C
      errorcode = ERR85;
      goto ESCAPE_FAILED;
#else
      if ((options & PCRE2_NEVER_BACKSLASH_C) != 0)
        {
        errorcode = ERR83;
        goto ESCAPE_FAILED;
        }
#endif
      okquantifier = TRUE;
      *parsed_pattern++ = META_ESCAPE + escape;
      break;

      case ESC_X:
#ifndef SUPPORT_UNICODE
      errorcode = ERR45;   /* Supported only with Unicode support */
      goto ESCAPE_FAILED;
#endif
      case ESC_H:
      case ESC_h:
      case ESC_N:
      case ESC_R:
      case ESC_V:
      case ESC_v:
      okquantifier = TRUE;
      *parsed_pattern++ = META_ESCAPE + escape;
      break;

      default:  /* \A, \B, \b, \G, \K, \Z, \z cannot be quantified. */
      *parsed_pattern++ = META_ESCAPE + escape;
      break;

      /* Escapes that change in UCP mode. Note that PCRE2_UCP will never be set
      without Unicode support because it is checked when pcre2_compile() is
      called. */

      case ESC_d:
      case ESC_D:
      case ESC_s:
      case ESC_S:
      case ESC_w:
      case ESC_W:
      okquantifier = TRUE;
      if ((options & PCRE2_UCP) == 0)
        {
        *parsed_pattern++ = META_ESCAPE + escape;
        }
      else
        {
        *parsed_pattern++ = META_ESCAPE +
          ((escape == ESC_d || escape == ESC_s || escape == ESC_w)?
            ESC_p : ESC_P);
        switch(escape)
          {
          case ESC_d:
          case ESC_D:
          *parsed_pattern++ = (PT_PC << 16) | ucp_Nd;
          break;

          case ESC_s:
          case ESC_S:
          *parsed_pattern++ = PT_SPACE << 16;
          break;

          case ESC_w:
          case ESC_W:
          *parsed_pattern++ = PT_WORD << 16;
          break;
          }
        }
      break;

      /* Unicode property matching */

      case ESC_P:
      case ESC_p:
#ifdef SUPPORT_UNICODE
        {
        BOOL negated;
        uint16_t ptype = 0, pdata = 0;
        if (!get_ucp(&ptr, &negated, &ptype, &pdata, &errorcode, cb))
          goto ESCAPE_FAILED;
        if (negated) escape = (escape == ESC_P)? ESC_p : ESC_P;
        *parsed_pattern++ = META_ESCAPE + escape;
        *parsed_pattern++ = (ptype << 16) | pdata;
        okquantifier = TRUE;
        }
#else
      errorcode = ERR45;
      goto ESCAPE_FAILED;
#endif
      break;  /* End \P and \p */

      /* When \g is used with quotes or angle brackets as delimiters, it is a
      numerical or named subroutine call, and control comes here. When used
      with brace delimiters it is a numberical back reference and does not come
      here because check_escape() returns it directly as a reference. \k is
      always a named back reference. */

      case ESC_g:
      case ESC_k:
      if (ptr >= ptrend || (*ptr != CHAR_LEFT_CURLY_BRACKET &&
          *ptr != CHAR_LESS_THAN_SIGN && *ptr != CHAR_APOSTROPHE))
        {
        errorcode = (escape == ESC_g)? ERR57 : ERR69;
        goto ESCAPE_FAILED;
        }
      terminator = (*ptr == CHAR_LESS_THAN_SIGN)?
        CHAR_GREATER_THAN_SIGN : (*ptr == CHAR_APOSTROPHE)?
        CHAR_APOSTROPHE : CHAR_RIGHT_CURLY_BRACKET;

      /* For a non-braced \g, check for a numerical recursion. */

      if (escape == ESC_g && terminator != CHAR_RIGHT_CURLY_BRACKET)
        {
        PCRE2_SPTR p = ptr + 1;

        if (read_number(&p, ptrend, cb->bracount, MAX_GROUP_NUMBER, ERR61, &i,
            &errorcode))
          {
          if (p >= ptrend || *p != terminator)
            {
            errorcode = ERR57;
            goto ESCAPE_FAILED;
            }
          ptr = p;
          goto SET_RECURSION;
          }
        if (errorcode != 0) goto ESCAPE_FAILED;
        }

      /* Not a numerical recursion */

      if (!read_name(&ptr, ptrend, utf, terminator, &offset, &name, &namelen,
          &errorcode, cb)) goto ESCAPE_FAILED;

      /* \k and \g when used with braces are back references, whereas \g used
      with quotes or angle brackets is a recursion */

      *parsed_pattern++ =
        (escape == ESC_k || terminator == CHAR_RIGHT_CURLY_BRACKET)?
          META_BACKREF_BYNAME : META_RECURSE_BYNAME;
      *parsed_pattern++ = namelen;

      PUTOFFSET(offset, parsed_pattern);
      okquantifier = TRUE;
      break;  /* End special escape processing */
      }
    break;    /* End escape sequence processing */


    /* ---- Single-character special items ---- */

    case CHAR_CIRCUMFLEX_ACCENT:
    *parsed_pattern++ = META_CIRCUMFLEX;
    break;

    case CHAR_DOLLAR_SIGN:
    *parsed_pattern++ = META_DOLLAR;
    break;

    case CHAR_DOT:
    *parsed_pattern++ = META_DOT;
    okquantifier = TRUE;
    break;


    /* ---- Single-character quantifiers ---- */

    case CHAR_ASTERISK:
    meta_quantifier = META_ASTERISK;
    goto CHECK_QUANTIFIER;

    case CHAR_PLUS:
    meta_quantifier = META_PLUS;
    goto CHECK_QUANTIFIER;

    case CHAR_QUESTION_MARK:
    meta_quantifier = META_QUERY;
    goto CHECK_QUANTIFIER;


    /* ---- Potential {n,m} quantifier ---- */

    case CHAR_LEFT_CURLY_BRACKET:
    if (!read_repeat_counts(&ptr, ptrend, &min_repeat, &max_repeat,
        &errorcode))
      {
      if (errorcode != 0) goto FAILED;     /* Error in quantifier. */
      PARSED_LITERAL(c, parsed_pattern);   /* Not a quantifier */
      break;                               /* No more quantifier processing */
      }
    meta_quantifier = META_MINMAX;
    /* Fall through */


    /* ---- Quantifier post-processing ---- */

    /* Check that a quantifier is allowed after the previous item. */

    CHECK_QUANTIFIER:
    if (!prev_okquantifier)
      {
      errorcode = ERR9;
      goto FAILED_BACK;
      }

    /* Most (*VERB)s are not allowed to be quantified, but an ungreedy
    quantifier can be useful for (*ACCEPT) - meaning "succeed on backtrack", a
    sort of negated (*COMMIT). We therefore allow (*ACCEPT) to be quantified by
    wrapping it in non-capturing brackets, but we have to allow for a preceding
    (*MARK) for when (*ACCEPT) has an argument. */

    if (parsed_pattern[-1] == META_ACCEPT)
      {
      uint32_t *p;
      for (p = parsed_pattern - 1; p >= verbstartptr; p--) p[1] = p[0];
      *verbstartptr = META_NOCAPTURE;
      parsed_pattern[1] = META_KET;
      parsed_pattern += 2;
      }

    /* Now we can put the quantifier into the parsed pattern vector. At this
    stage, we have only the basic quantifier. The check for a following + or ?
    modifier happens at the top of the loop, after any intervening comments
    have been removed. */

    *parsed_pattern++ = meta_quantifier;
    if (c == CHAR_LEFT_CURLY_BRACKET)
      {
      *parsed_pattern++ = min_repeat;
      *parsed_pattern++ = max_repeat;
      }
    break;


    /* ---- Character class ---- */

    case CHAR_LEFT_SQUARE_BRACKET:
    okquantifier = TRUE;

    /* In another (POSIX) regex library, the ugly syntax [[:<:]] and [[:>:]] is
    used for "start of word" and "end of word". As these are otherwise illegal
    sequences, we don't break anything by recognizing them. They are replaced
    by \b(?=\w) and \b(?<=\w) respectively. Sequences like [a[:<:]] are
    erroneous and are handled by the normal code below. */

    if (ptrend - ptr >= 6 &&
         (PRIV(strncmp_c8)(ptr, STRING_WEIRD_STARTWORD, 6) == 0 ||
          PRIV(strncmp_c8)(ptr, STRING_WEIRD_ENDWORD, 6) == 0))
      {
      *parsed_pattern++ = META_ESCAPE + ESC_b;

      if (ptr[2] == CHAR_LESS_THAN_SIGN)
        {
        *parsed_pattern++ = META_LOOKAHEAD;
        }
      else
        {
        *parsed_pattern++ = META_LOOKBEHIND;
        *has_lookbehind = TRUE;

        /* The offset is used only for the "non-fixed length" error; this won't
        occur here, so just store zero. */

        PUTOFFSET((PCRE2_SIZE)0, parsed_pattern);
        }

      if ((options & PCRE2_UCP) == 0)
        *parsed_pattern++ = META_ESCAPE + ESC_w;
      else
        {
        *parsed_pattern++ = META_ESCAPE + ESC_p;
        *parsed_pattern++ = PT_WORD << 16;
        }
      *parsed_pattern++ = META_KET;
      ptr += 6;
      break;
      }

    /* PCRE supports POSIX class stuff inside a class. Perl gives an error if
    they are encountered at the top level, so we'll do that too. */

    if (ptr < ptrend && (*ptr == CHAR_COLON || *ptr == CHAR_DOT ||
         *ptr == CHAR_EQUALS_SIGN) &&
        check_posix_syntax(ptr, ptrend, &tempptr))
      {
      errorcode = (*ptr-- == CHAR_COLON)? ERR12 : ERR13;
      goto FAILED;
      }

    /* Process a regular character class. If the first character is '^', set
    the negation flag. If the first few characters (either before or after ^)
    are \Q\E or \E or space or tab in extended-more mode, we skip them too.
    This makes for compatibility with Perl. */

    negate_class = FALSE;
    while (ptr < ptrend)
      {
      GETCHARINCTEST(c, ptr);
      if (c == CHAR_BACKSLASH)
        {
        if (ptr < ptrend && *ptr == CHAR_E) ptr++;
        else if (ptrend - ptr >= 3 &&
             PRIV(strncmp_c8)(ptr, STR_Q STR_BACKSLASH STR_E, 3) == 0)
          ptr += 3;
        else
          break;
        }
      else if ((options & PCRE2_EXTENDED_MORE) != 0 &&
               (c == CHAR_SPACE || c == CHAR_HT))  /* Note: just these two */
        continue;
      else if (!negate_class && c == CHAR_CIRCUMFLEX_ACCENT)
        negate_class = TRUE;
      else break;
      }

    /* Now the real contents of the class; c has the first "real" character.
    Empty classes are permitted only if the option is set. */

    if (c == CHAR_RIGHT_SQUARE_BRACKET &&
        (cb->external_options & PCRE2_ALLOW_EMPTY_CLASS) != 0)
      {
      *parsed_pattern++ = negate_class? META_CLASS_EMPTY_NOT : META_CLASS_EMPTY;
      break;  /* End of class processing */
      }

    /* Process a non-empty class. */

    *parsed_pattern++ = negate_class? META_CLASS_NOT : META_CLASS;
    class_range_state = RANGE_NO;

    /* In an EBCDIC environment, Perl treats alphabetic ranges specially
    because there are holes in the encoding, and simply using the range A-Z
    (for example) would include the characters in the holes. This applies only
    to ranges where both values are literal; [\xC1-\xE9] is different to [A-Z]
    in this respect. In order to accommodate this, we keep track of whether
    character values are literal or not, and a state variable for handling
    ranges. */

    /* Loop for the contents of the class */

    for (;;)
      {
      BOOL char_is_literal = TRUE;

      /* Inside \Q...\E everything is literal except \E */

      if (inescq)
        {
        if (c == CHAR_BACKSLASH && ptr < ptrend && *ptr == CHAR_E)
          {
          inescq = FALSE;                   /* Reset literal state */
          ptr++;                            /* Skip the 'E' */
          goto CLASS_CONTINUE;
          }
        goto CLASS_LITERAL;
        }

      /* Skip over space and tab (only) in extended-more mode. */

      if ((options & PCRE2_EXTENDED_MORE) != 0 &&
          (c == CHAR_SPACE || c == CHAR_HT))
        goto CLASS_CONTINUE;

      /* Handle POSIX class names. Perl allows a negation extension of the
      form [:^name:]. A square bracket that doesn't match the syntax is
      treated as a literal. We also recognize the POSIX constructions
      [.ch.] and [=ch=] ("collating elements") and fault them, as Perl
      5.6 and 5.8 do. */

      if (c == CHAR_LEFT_SQUARE_BRACKET &&
          ptrend - ptr >= 3 &&
          (*ptr == CHAR_COLON || *ptr == CHAR_DOT ||
           *ptr == CHAR_EQUALS_SIGN) &&
          check_posix_syntax(ptr, ptrend, &tempptr))
        {
        BOOL posix_negate = FALSE;
        int posix_class;

        /* Perl treats a hyphen before a POSIX class as a literal, not the
        start of a range. However, it gives a warning in its warning mode. PCRE
        does not have a warning mode, so we give an error, because this is
        likely an error on the user's part. */

        if (class_range_state == RANGE_STARTED)
          {
          errorcode = ERR50;
          goto FAILED;
          }

        if (*ptr != CHAR_COLON)
          {
          errorcode = ERR13;
          goto FAILED_BACK;
          }

        if (*(++ptr) == CHAR_CIRCUMFLEX_ACCENT)
          {
          posix_negate = TRUE;
          ptr++;
          }

        posix_class = check_posix_name(ptr, (int)(tempptr - ptr));
        if (posix_class < 0)
          {
          errorcode = ERR30;
          goto FAILED;
          }
        ptr = tempptr + 2;

        /* Perl treats a hyphen after a POSIX class as a literal, not the
        start of a range. However, it gives a warning in its warning mode
        unless the hyphen is the last character in the class. PCRE does not
        have a warning mode, so we give an error, because this is likely an
        error on the user's part. */

        if (ptr < ptrend - 1 && *ptr == CHAR_MINUS &&
            ptr[1] != CHAR_RIGHT_SQUARE_BRACKET)
          {
          errorcode = ERR50;
          goto FAILED;
          }

        /* Set "a hyphen is not the start of a range" for the -] case, and also
        in case the POSIX class is followed by \E or \Q\E (possibly repeated -
        fuzzers do that kind of thing) and *then* a hyphen. This causes that
        hyphen to be treated as a literal. I don't think it's worth setting up
        special apparatus to do otherwise. */

        class_range_state = RANGE_NO;

        /* When PCRE2_UCP is set, some of the POSIX classes are converted to
        use Unicode properties \p or \P or, in one case, \h or \H. The
        substitutes table has two values per class, containing the type and
        value of a \p or \P item. The special cases are specified with a
        negative type: a non-zero value causes \h or \H to be used, and a zero
        value falls through to behave like a non-UCP POSIX class. */

#ifdef SUPPORT_UNICODE
        if ((options & PCRE2_UCP) != 0)
          {
          int ptype = posix_substitutes[2*posix_class];
          int pvalue = posix_substitutes[2*posix_class + 1];
          if (ptype >= 0)
            {
            *parsed_pattern++ = META_ESCAPE + (posix_negate? ESC_P : ESC_p);
            *parsed_pattern++ = (ptype << 16) | pvalue;
            goto CLASS_CONTINUE;
            }

          if (pvalue != 0)
            {
            *parsed_pattern++ = META_ESCAPE + (posix_negate? ESC_H : ESC_h);
            goto CLASS_CONTINUE;
            }

          /* Fall through */
          }
#endif  /* SUPPORT_UNICODE */

        /* Non-UCP POSIX class */

        *parsed_pattern++ = posix_negate? META_POSIX_NEG : META_POSIX;
        *parsed_pattern++ = posix_class;
        }

      /* Handle potential start of range */

      else if (c == CHAR_MINUS && class_range_state >= RANGE_OK_ESCAPED)
        {
        *parsed_pattern++ = (class_range_state == RANGE_OK_LITERAL)?
          META_RANGE_LITERAL : META_RANGE_ESCAPED;
        class_range_state = RANGE_STARTED;
        }

      /* Handle a literal character */

      else if (c != CHAR_BACKSLASH)
        {
        CLASS_LITERAL:
        if (class_range_state == RANGE_STARTED)
          {
          if (c == parsed_pattern[-2])       /* Optimize one-char range */
            parsed_pattern--;
          else if (parsed_pattern[-2] > c)   /* Check range is in order */
            {
            errorcode = ERR8;
            goto FAILED_BACK;
            }
          else
            {
            if (!char_is_literal && parsed_pattern[-1] == META_RANGE_LITERAL)
              parsed_pattern[-1] = META_RANGE_ESCAPED;
            PARSED_LITERAL(c, parsed_pattern);
            }
          class_range_state = RANGE_NO;
          }
        else  /* Potential start of range */
          {
          class_range_state = char_is_literal?
            RANGE_OK_LITERAL : RANGE_OK_ESCAPED;
          PARSED_LITERAL(c, parsed_pattern);
          }
        }

      /* Handle escapes in a class */

      else
        {
        tempptr = ptr;
        escape = PRIV(check_escape)(&ptr, ptrend, &c, &errorcode, options,
          cb->cx->extra_options, TRUE, cb);

        if (errorcode != 0)
          {
          if ((extra_options & PCRE2_EXTRA_BAD_ESCAPE_IS_LITERAL) == 0)
            goto FAILED;
          ptr = tempptr;
          if (ptr >= ptrend) c = CHAR_BACKSLASH; else
            {
            GETCHARINCTEST(c, ptr);   /* Get character value, increment pointer */
            }
          escape = 0;                 /* Treat as literal character */
          }

        switch(escape)
          {
          case 0:  /* Escaped character code point is in c */
          char_is_literal = FALSE;
          goto CLASS_LITERAL;

          case ESC_b:
          c = CHAR_BS;    /* \b is backspace in a class */
          char_is_literal = FALSE;
          goto CLASS_LITERAL;

          case ESC_Q:
          inescq = TRUE;  /* Enter literal mode */
          goto CLASS_CONTINUE;

          case ESC_E:     /* Ignore orphan \E */
          goto CLASS_CONTINUE;

          case ESC_B:     /* Always an error in a class */
          case ESC_R:
          case ESC_X:
          errorcode = ERR7;
          ptr--;
          goto FAILED;
          }

        /* The second part of a range can be a single-character escape
        sequence (detected above), but not any of the other escapes. Perl
        treats a hyphen as a literal in such circumstances. However, in Perl's
        warning mode, a warning is given, so PCRE now faults it, as it is
        almost certainly a mistake on the user's part. */

        if (class_range_state == RANGE_STARTED)
          {
          errorcode = ERR50;
          goto FAILED;  /* Not CLASS_ESCAPE_FAILED; always an error */
          }

        /* Of the remaining escapes, only those that define characters are
        allowed in a class. None may start a range. */

        class_range_state = RANGE_NO;
        switch(escape)
          {
          case ESC_N:
          errorcode = ERR71;
          goto FAILED;

          case ESC_H:
          case ESC_h:
          case ESC_V:
          case ESC_v:
          *parsed_pattern++ = META_ESCAPE + escape;
          break;

          /* These escapes are converted to Unicode property tests when
          PCRE2_UCP is set. */

          case ESC_d:
          case ESC_D:
          case ESC_s:
          case ESC_S:
          case ESC_w:
          case ESC_W:
          if ((options & PCRE2_UCP) == 0)
            {
            *parsed_pattern++ = META_ESCAPE + escape;
            }
          else
            {
            *parsed_pattern++ = META_ESCAPE +
              ((escape == ESC_d || escape == ESC_s || escape == ESC_w)?
                ESC_p : ESC_P);
            switch(escape)
              {
              case ESC_d:
              case ESC_D:
              *parsed_pattern++ = (PT_PC << 16) | ucp_Nd;
              break;

              case ESC_s:
              case ESC_S:
              *parsed_pattern++ = PT_SPACE << 16;
              break;

              case ESC_w:
              case ESC_W:
              *parsed_pattern++ = PT_WORD << 16;
              break;
              }
            }
          break;

          /* Explicit Unicode property matching */

          case ESC_P:
          case ESC_p:
#ifdef SUPPORT_UNICODE
            {
            BOOL negated;
            uint16_t ptype = 0, pdata = 0;
            if (!get_ucp(&ptr, &negated, &ptype, &pdata, &errorcode, cb))
              goto FAILED;
            if (negated) escape = (escape == ESC_P)? ESC_p : ESC_P;
            *parsed_pattern++ = META_ESCAPE + escape;
            *parsed_pattern++ = (ptype << 16) | pdata;
            }
#else
          errorcode = ERR45;
          goto FAILED;
#endif
          break;  /* End \P and \p */

          default:    /* All others are not allowed in a class */
          errorcode = ERR7;
          ptr--;
          goto FAILED;
          }

        /* Perl gives a warning unless a following hyphen is the last character
        in the class. PCRE throws an error. */

        if (ptr < ptrend - 1 && *ptr == CHAR_MINUS &&
            ptr[1] != CHAR_RIGHT_SQUARE_BRACKET)
          {
          errorcode = ERR50;
          goto FAILED;
          }
        }

      /* Proceed to next thing in the class. */

      CLASS_CONTINUE:
      if (ptr >= ptrend)
        {
        errorcode = ERR6;  /* Missing terminating ']' */
        goto FAILED;
        }
      GETCHARINCTEST(c, ptr);
      if (c == CHAR_RIGHT_SQUARE_BRACKET && !inescq) break;
      }     /* End of class-processing loop */

    /* -] at the end of a class is a literal '-' */

    if (class_range_state == RANGE_STARTED)
      {
      parsed_pattern[-1] = CHAR_MINUS;
      class_range_state = RANGE_NO;
      }

    *parsed_pattern++ = META_CLASS_END;
    break;  /* End of character class */


    /* ---- Opening parenthesis ---- */

    case CHAR_LEFT_PARENTHESIS:
    if (ptr >= ptrend) goto UNCLOSED_PARENTHESIS;

    /* If ( is not followed by ? it is either a capture or a special verb or an
    alpha assertion. */

    if (*ptr != CHAR_QUESTION_MARK)
      {
      const char *vn;

      /* Handle capturing brackets (or non-capturing if auto-capture is turned
      off). */

      if (*ptr != CHAR_ASTERISK)
        {
        nest_depth++;
        if ((options & PCRE2_NO_AUTO_CAPTURE) == 0)
          {
          if (cb->bracount >= MAX_GROUP_NUMBER)
            {
            errorcode = ERR97;
            goto FAILED;
            }
          cb->bracount++;
          *parsed_pattern++ = META_CAPTURE | cb->bracount;
          }
        else *parsed_pattern++ = META_NOCAPTURE;
        }

      /* Do nothing for (* followed by end of pattern or ) so it gives a "bad
      quantifier" error rather than "(*MARK) must have an argument". */

      else if (ptrend - ptr <= 1 || (c = ptr[1]) == CHAR_RIGHT_PARENTHESIS)
        break;

      /* Handle "alpha assertions" such as (*pla:...). Most of these are
      synonyms for the historical symbolic assertions, but the script run ones
      are new. They are distinguished by starting with a lower case letter.
      Checking both ends of the alphabet makes this work in all character
      codes. */

      else if (CHMAX_255(c) && (cb->ctypes[c] & ctype_lcletter) != 0)
        {
        uint32_t meta;

        vn = alasnames;
        if (!read_name(&ptr, ptrend, utf, 0, &offset, &name, &namelen,
          &errorcode, cb)) goto FAILED;
        if (ptr >= ptrend || *ptr != CHAR_COLON)
          {
          errorcode = ERR95;  /* Malformed */
          goto FAILED;
          }

        /* Scan the table of alpha assertion names */

        for (i = 0; i < alascount; i++)
          {
          if (namelen == alasmeta[i].len &&
              PRIV(strncmp_c8)(name, vn, namelen) == 0)
            break;
          vn += alasmeta[i].len + 1;
          }

        if (i >= alascount)
          {
          errorcode = ERR95;  /* Alpha assertion not recognized */
          goto FAILED;
          }

        /* Check for expecting an assertion condition. If so, only atomic
        lookaround assertions are valid. */

        meta = alasmeta[i].meta;
        if (prev_expect_cond_assert > 0 &&
            (meta < META_LOOKAHEAD || meta > META_LOOKBEHINDNOT))
          {
          errorcode = (meta == META_LOOKAHEAD_NA || meta == META_LOOKBEHIND_NA)?
            ERR98 : ERR28;  /* (Atomic) assertion expected */
          goto FAILED;
          }

        /* The lookaround alphabetic synonyms can mostly be handled by jumping
        to the code that handles the traditional symbolic forms. */

        switch(meta)
          {
          default:
          errorcode = ERR89;  /* Unknown code; should never occur because */
          goto FAILED;        /* the meta values come from a table above. */

          case META_ATOMIC:
          goto ATOMIC_GROUP;

          case META_LOOKAHEAD:
          goto POSITIVE_LOOK_AHEAD;

          case META_LOOKAHEAD_NA:
          *parsed_pattern++ = meta;
          ptr++;
          goto POST_ASSERTION;

          case META_LOOKAHEADNOT:
          goto NEGATIVE_LOOK_AHEAD;

          case META_LOOKBEHIND:
          case META_LOOKBEHINDNOT:
          case META_LOOKBEHIND_NA:
          *parsed_pattern++ = meta;
          ptr--;
          goto POST_LOOKBEHIND;

          /* The script run facilities are handled here. Unicode support is
          required (give an error if not, as this is a security issue). Always
          record a META_SCRIPT_RUN item. Then, for the atomic version, insert
          META_ATOMIC and remember that we need two META_KETs at the end. */

          case META_SCRIPT_RUN:
          case META_ATOMIC_SCRIPT_RUN:
#ifdef SUPPORT_UNICODE
          *parsed_pattern++ = META_SCRIPT_RUN;
          nest_depth++;
          ptr++;
          if (meta == META_ATOMIC_SCRIPT_RUN)
            {
            *parsed_pattern++ = META_ATOMIC;
            if (top_nest == NULL) top_nest = (nest_save *)(cb->start_workspace);
            else if (++top_nest >= end_nests)
              {
              errorcode = ERR84;
              goto FAILED;
              }
            top_nest->nest_depth = nest_depth;
            top_nest->flags = NSF_ATOMICSR;
            top_nest->options = options & PARSE_TRACKED_OPTIONS;
            }
          break;
#else  /* SUPPORT_UNICODE */
          errorcode = ERR96;
          goto FAILED;
#endif
          }
        }


      /* ---- Handle (*VERB) and (*VERB:NAME) ---- */

      else
        {
        vn = verbnames;
        if (!read_name(&ptr, ptrend, utf, 0, &offset, &name, &namelen,
          &errorcode, cb)) goto FAILED;
        if (ptr >= ptrend || (*ptr != CHAR_COLON &&
                              *ptr != CHAR_RIGHT_PARENTHESIS))
          {
          errorcode = ERR60;  /* Malformed */
          goto FAILED;
          }

        /* Scan the table of verb names */

        for (i = 0; i < verbcount; i++)
          {
          if (namelen == verbs[i].len &&
              PRIV(strncmp_c8)(name, vn, namelen) == 0)
            break;
          vn += verbs[i].len + 1;
          }

        if (i >= verbcount)
          {
          errorcode = ERR60;  /* Verb not recognized */
          goto FAILED;
          }

        /* An empty argument is treated as no argument. */

        if (*ptr == CHAR_COLON && ptr + 1 < ptrend &&
             ptr[1] == CHAR_RIGHT_PARENTHESIS)
          ptr++;    /* Advance to the closing parens */

        /* Check for mandatory non-empty argument; this is (*MARK) */

        if (verbs[i].has_arg > 0 && *ptr != CHAR_COLON)
          {
          errorcode = ERR66;
          goto FAILED;
          }

        /* Remember where this verb, possibly with a preceding (*MARK), starts,
        for handling quantified (*ACCEPT). */

        verbstartptr = parsed_pattern;
        okquantifier = (verbs[i].meta == META_ACCEPT);

        /* It appears that Perl allows any characters whatsoever, other than a
        closing parenthesis, to appear in arguments ("names"), so we no longer
        insist on letters, digits, and underscores. Perl does not, however, do
        any interpretation within arguments, and has no means of including a
        closing parenthesis. PCRE supports escape processing but only when it
        is requested by an option. We set inverbname TRUE here, and let the
        main loop take care of this so that escape and \x processing is done by
        the main code above. */

        if (*ptr++ == CHAR_COLON)   /* Skip past : or ) */
          {
          /* Some optional arguments can be treated as a preceding (*MARK) */

          if (verbs[i].has_arg < 0)
            {
            add_after_mark = verbs[i].meta;
            *parsed_pattern++ = META_MARK;
            }

          /* The remaining verbs with arguments (except *MARK) need a different
          opcode. */

          else
            {
            *parsed_pattern++ = verbs[i].meta +
              ((verbs[i].meta != META_MARK)? 0x00010000u:0);
            }

          /* Set up for reading the name in the main loop. */

          verblengthptr = parsed_pattern++;
          verbnamestart = ptr;
          inverbname = TRUE;
          }
        else  /* No verb "name" argument */
          {
          *parsed_pattern++ = verbs[i].meta;
          }
        }     /* End of (*VERB) handling */
      break;  /* Done with this parenthesis */
      }       /* End of groups that don't start with (? */


    /* ---- Items starting (? ---- */

    /* The type of item is determined by what follows (?. Handle (?| and option
    changes under "default" because both need a new block on the nest stack.
    Comments starting with (?# are handled above. Note that there is some
    ambiguity about the sequence (?- because if a digit follows it's a relative
    recursion or subroutine call whereas otherwise it's an option unsetting. */

    if (++ptr >= ptrend) goto UNCLOSED_PARENTHESIS;

    switch(*ptr)
      {
      default:
      if (*ptr == CHAR_MINUS && ptrend - ptr > 1 && IS_DIGIT(ptr[1]))
        goto RECURSION_BYNUMBER;  /* The + case is handled by CHAR_PLUS */

      /* We now have either (?| or a (possibly empty) option setting,
      optionally followed by a non-capturing group. */

      nest_depth++;
      if (top_nest == NULL) top_nest = (nest_save *)(cb->start_workspace);
      else if (++top_nest >= end_nests)
        {
        errorcode = ERR84;
        goto FAILED;
        }
      top_nest->nest_depth = nest_depth;
      top_nest->flags = 0;
      top_nest->options = options & PARSE_TRACKED_OPTIONS;

      /* Start of non-capturing group that resets the capture count for each
      branch. */

      if (*ptr == CHAR_VERTICAL_LINE)
        {
        top_nest->reset_group = (uint16_t)cb->bracount;
        top_nest->max_group = (uint16_t)cb->bracount;
        top_nest->flags |= NSF_RESET;
        cb->external_flags |= PCRE2_DUPCAPUSED;
        *parsed_pattern++ = META_NOCAPTURE;
        ptr++;
        }

      /* Scan for options imnsxJU to be set or unset. */

      else
        {
        BOOL hyphenok = TRUE;
        uint32_t oldoptions = options;

        top_nest->reset_group = 0;
        top_nest->max_group = 0;
        set = unset = 0;
        optset = &set;

        /* ^ at the start unsets imnsx and disables the subsequent use of - */

        if (ptr < ptrend && *ptr == CHAR_CIRCUMFLEX_ACCENT)
          {
          options &= ~(PCRE2_CASELESS|PCRE2_MULTILINE|PCRE2_NO_AUTO_CAPTURE|
                       PCRE2_DOTALL|PCRE2_EXTENDED|PCRE2_EXTENDED_MORE);
          hyphenok = FALSE;
          ptr++;
          }

        while (ptr < ptrend && *ptr != CHAR_RIGHT_PARENTHESIS &&
                               *ptr != CHAR_COLON)
          {
          switch (*ptr++)
            {
            case CHAR_MINUS:
            if (!hyphenok)
              {
              errorcode = ERR94;
              ptr--;  /* Correct the offset */
              goto FAILED;
              }
            optset = &unset;
            hyphenok = FALSE;
            break;

            case CHAR_J:  /* Record that it changed in the external options */
            *optset |= PCRE2_DUPNAMES;
            cb->external_flags |= PCRE2_JCHANGED;
            break;

            case CHAR_i: *optset |= PCRE2_CASELESS; break;
            case CHAR_m: *optset |= PCRE2_MULTILINE; break;
            case CHAR_n: *optset |= PCRE2_NO_AUTO_CAPTURE; break;
            case CHAR_s: *optset |= PCRE2_DOTALL; break;
            case CHAR_U: *optset |= PCRE2_UNGREEDY; break;

            /* If x appears twice it sets the extended extended option. */

            case CHAR_x:
            *optset |= PCRE2_EXTENDED;
            if (ptr < ptrend && *ptr == CHAR_x)
              {
              *optset |= PCRE2_EXTENDED_MORE;
              ptr++;
              }
            break;

            default:
            errorcode = ERR11;
            ptr--;    /* Correct the offset */
            goto FAILED;
            }
          }

        /* If we are setting extended without extended-more, ensure that any
        existing extended-more gets unset. Also, unsetting extended must also
        unset extended-more. */

        if ((set & (PCRE2_EXTENDED|PCRE2_EXTENDED_MORE)) == PCRE2_EXTENDED ||
            (unset & PCRE2_EXTENDED) != 0)
          unset |= PCRE2_EXTENDED_MORE;

        options = (options | set) & (~unset);

        /* If the options ended with ')' this is not the start of a nested
        group with option changes, so the options change at this level.
        In this case, if the previous level set up a nest block, discard the
        one we have just created. Otherwise adjust it for the previous level.
        If the options ended with ':' we are starting a non-capturing group,
        possibly with an options setting. */

        if (ptr >= ptrend) goto UNCLOSED_PARENTHESIS;
        if (*ptr++ == CHAR_RIGHT_PARENTHESIS)
          {
          nest_depth--;  /* This is not a nested group after all. */
          if (top_nest > (nest_save *)(cb->start_workspace) &&
              (top_nest-1)->nest_depth == nest_depth) top_nest--;
          else top_nest->nest_depth = nest_depth;
          }
        else *parsed_pattern++ = META_NOCAPTURE;

        /* If nothing changed, no need to record. */

        if (options != oldoptions)
          {
          *parsed_pattern++ = META_OPTIONS;
          *parsed_pattern++ = options;
          }
        }     /* End options processing */
      break;  /* End default case after (? */


      /* ---- Python syntax support ---- */

      case CHAR_P:
      if (++ptr >= ptrend) goto UNCLOSED_PARENTHESIS;

      /* (?P<name> is the same as (?<name>, which defines a named group. */

      if (*ptr == CHAR_LESS_THAN_SIGN)
        {
        terminator = CHAR_GREATER_THAN_SIGN;
        goto DEFINE_NAME;
        }

      /* (?P>name) is the same as (?&name), which is a recursion or subroutine
      call. */

      if (*ptr == CHAR_GREATER_THAN_SIGN) goto RECURSE_BY_NAME;

      /* (?P=name) is the same as \k<name>, a back reference by name. Anything
      else after (?P is an error. */

      if (*ptr != CHAR_EQUALS_SIGN)
        {
        errorcode = ERR41;
        goto FAILED;
        }
      if (!read_name(&ptr, ptrend, utf, CHAR_RIGHT_PARENTHESIS, &offset, &name,
          &namelen, &errorcode, cb)) goto FAILED;
      *parsed_pattern++ = META_BACKREF_BYNAME;
      *parsed_pattern++ = namelen;
      PUTOFFSET(offset, parsed_pattern);
      okquantifier = TRUE;
      break;   /* End of (?P processing */


      /* ---- Recursion/subroutine calls by number ---- */

      case CHAR_R:
      i = 0;         /* (?R) == (?R0) */
      ptr++;
      if (ptr >= ptrend || *ptr != CHAR_RIGHT_PARENTHESIS)
        {
        errorcode = ERR58;
        goto FAILED;
        }
      goto SET_RECURSION;

      /* An item starting (?- followed by a digit comes here via the "default"
      case because (?- followed by a non-digit is an options setting. */

      case CHAR_PLUS:
      if (ptrend - ptr < 2 || !IS_DIGIT(ptr[1]))
        {
        errorcode = ERR29;   /* Missing number */
        goto FAILED;
        }
      /* Fall through */

      case CHAR_0: case CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4:
      case CHAR_5: case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:
      RECURSION_BYNUMBER:
      if (!read_number(&ptr, ptrend,
          (IS_DIGIT(*ptr))? -1:(int)(cb->bracount), /* + and - are relative */
          MAX_GROUP_NUMBER, ERR61,
          &i, &errorcode)) goto FAILED;
      if (i < 0)  /* NB (?0) is permitted */
        {
        errorcode = ERR15;   /* Unknown group */
        goto FAILED_BACK;
        }
      if (ptr >= ptrend || *ptr != CHAR_RIGHT_PARENTHESIS)
        goto UNCLOSED_PARENTHESIS;

      SET_RECURSION:
      *parsed_pattern++ = META_RECURSE | (uint32_t)i;
      offset = (PCRE2_SIZE)(ptr - cb->start_pattern);
      ptr++;
      PUTOFFSET(offset, parsed_pattern);
      okquantifier = TRUE;
      break;  /* End of recursive call by number handling */


      /* ---- Recursion/subroutine calls by name ---- */

      case CHAR_AMPERSAND:
      RECURSE_BY_NAME:
      if (!read_name(&ptr, ptrend, utf, CHAR_RIGHT_PARENTHESIS, &offset, &name,
          &namelen, &errorcode, cb)) goto FAILED;
      *parsed_pattern++ = META_RECURSE_BYNAME;
      *parsed_pattern++ = namelen;
      PUTOFFSET(offset, parsed_pattern);
      okquantifier = TRUE;
      break;

      /* ---- Callout with numerical or string argument ---- */

      case CHAR_C:
      if (++ptr >= ptrend) goto UNCLOSED_PARENTHESIS;

      /* If the previous item was a condition starting (?(? an assertion,
      optionally preceded by a callout, is expected. This is checked later on,
      during actual compilation. However we need to identify this kind of
      assertion in this pass because it must not be qualified. The value of
      expect_cond_assert is set to 2 after (?(? is processed. We decrement it
      for a callout - still leaving a positive value that identifies the
      assertion. Multiple callouts or any other items will make it zero or
      less, which doesn't matter because they will cause an error later. */

      expect_cond_assert = prev_expect_cond_assert - 1;

      /* If previous_callout is not NULL, it means this follows a previous
      callout. If it was a manual callout, do nothing; this means its "length
      of next pattern item" field will remain zero. If it was an automatic
      callout, abolish it. */

      if (previous_callout != NULL && (options & PCRE2_AUTO_CALLOUT) != 0 &&
          previous_callout == parsed_pattern - 4 &&
          parsed_pattern[-1] == 255)
        parsed_pattern = previous_callout;

      /* Save for updating next pattern item length, and skip one item before
      completing. */

      previous_callout = parsed_pattern;
      after_manual_callout = 1;

      /* Handle a string argument; specific delimiter is required. */

      if (*ptr != CHAR_RIGHT_PARENTHESIS && !IS_DIGIT(*ptr))
        {
        PCRE2_SIZE calloutlength;
        PCRE2_SPTR startptr = ptr;

        delimiter = 0;
        for (i = 0; PRIV(callout_start_delims)[i] != 0; i++)
          {
          if (*ptr == PRIV(callout_start_delims)[i])
            {
            delimiter = PRIV(callout_end_delims)[i];
            break;
            }
          }
        if (delimiter == 0)
          {
          errorcode = ERR82;
          goto FAILED;
          }

        *parsed_pattern = META_CALLOUT_STRING;
        parsed_pattern += 3;   /* Skip pattern info */

        for (;;)
          {
          if (++ptr >= ptrend)
            {
            errorcode = ERR81;
            ptr = startptr;   /* To give a more useful message */
            goto FAILED;
            }
          if (*ptr == delimiter && (++ptr >= ptrend || *ptr != delimiter))
            break;
          }

        calloutlength = (PCRE2_SIZE)(ptr - startptr);
        if (calloutlength > UINT32_MAX)
          {
          errorcode = ERR72;
          goto FAILED;
          }
        *parsed_pattern++ = (uint32_t)calloutlength;
        offset = (PCRE2_SIZE)(startptr - cb->start_pattern);
        PUTOFFSET(offset, parsed_pattern);
        }

      /* Handle a callout with an optional numerical argument, which must be
      less than or equal to 255. A missing argument gives 0. */

      else
        {
        int n = 0;
        *parsed_pattern = META_CALLOUT_NUMBER;     /* Numerical callout */
        parsed_pattern += 3;                       /* Skip pattern info */
        while (ptr < ptrend && IS_DIGIT(*ptr))
          {
          n = n * 10 + *ptr++ - CHAR_0;
          if (n > 255)
            {
            errorcode = ERR38;
            goto FAILED;
            }
          }
        *parsed_pattern++ = n;
        }

      /* Both formats must have a closing parenthesis */

      if (ptr >= ptrend || *ptr != CHAR_RIGHT_PARENTHESIS)
        {
        errorcode = ERR39;
        goto FAILED;
        }
      ptr++;

      /* Remember the offset to the next item in the pattern, and set a default
      length. This should get updated after the next item is read. */

      previous_callout[1] = (uint32_t)(ptr - cb->start_pattern);
      previous_callout[2] = 0;
      break;                  /* End callout */


      /* ---- Conditional group ---- */

      /* A condition can be an assertion, a number (referring to a numbered
      group's having been set), a name (referring to a named group), or 'R',
      referring to overall recursion. R<digits> and R&name are also permitted
      for recursion state tests. Numbers may be preceded by + or - to specify a
      relative group number.

      There are several syntaxes for testing a named group: (?(name)) is used
      by Python; Perl 5.10 onwards uses (?(<name>) or (?('name')).

      There are two unfortunate ambiguities. 'R' can be the recursive thing or
      the name 'R' (and similarly for 'R' followed by digits). 'DEFINE' can be
      the Perl DEFINE feature or the Python named test. We look for a name
      first; if not found, we try the other case.

      For compatibility with auto-callouts, we allow a callout to be specified
      before a condition that is an assertion. */

      case CHAR_LEFT_PARENTHESIS:
      if (++ptr >= ptrend) goto UNCLOSED_PARENTHESIS;
      nest_depth++;

      /* If the next character is ? or * there must be an assertion next
      (optionally preceded by a callout). We do not check this here, but
      instead we set expect_cond_assert to 2. If this is still greater than
      zero (callouts decrement it) when the next assertion is read, it will be
      marked as a condition that must not be repeated. A value greater than
      zero also causes checking that an assertion (possibly with callout)
      follows. */

      if (*ptr == CHAR_QUESTION_MARK || *ptr == CHAR_ASTERISK)
        {
        *parsed_pattern++ = META_COND_ASSERT;
        ptr--;   /* Pull pointer back to the opening parenthesis. */
        expect_cond_assert = 2;
        break;  /* End of conditional */
        }

      /* Handle (?([+-]number)... */

      if (read_number(&ptr, ptrend, cb->bracount, MAX_GROUP_NUMBER, ERR61, &i,
          &errorcode))
        {
        if (i <= 0)
          {
          errorcode = ERR15;
          goto FAILED;
          }
        *parsed_pattern++ = META_COND_NUMBER;
        offset = (PCRE2_SIZE)(ptr - cb->start_pattern - 2);
        PUTOFFSET(offset, parsed_pattern);
        *parsed_pattern++ = i;
        }
      else if (errorcode != 0) goto FAILED;   /* Number too big */

      /* No number found. Handle the special case (?(VERSION[>]=n.m)... */

      else if (ptrend - ptr >= 10 &&
               PRIV(strncmp_c8)(ptr, STRING_VERSION, 7) == 0 &&
               ptr[7] != CHAR_RIGHT_PARENTHESIS)
        {
        uint32_t ge = 0;
        int major = 0;
        int minor = 0;

        ptr += 7;
        if (*ptr == CHAR_GREATER_THAN_SIGN)
          {
          ge = 1;
          ptr++;
          }

        /* NOTE: cannot write IS_DIGIT(*(++ptr)) here because IS_DIGIT
        references its argument twice. */

        if (*ptr != CHAR_EQUALS_SIGN || (ptr++, !IS_DIGIT(*ptr)))
          goto BAD_VERSION_CONDITION;

        if (!read_number(&ptr, ptrend, -1, 1000, ERR79, &major, &errorcode))
          goto FAILED;

        if (ptr >= ptrend) goto BAD_VERSION_CONDITION;
        if (*ptr == CHAR_DOT)
          {
          if (++ptr >= ptrend || !IS_DIGIT(*ptr)) goto BAD_VERSION_CONDITION;
          minor = (*ptr++ - CHAR_0) * 10;
          if (IS_DIGIT(*ptr)) minor += *ptr++ - CHAR_0;
          if (ptr >= ptrend || *ptr != CHAR_RIGHT_PARENTHESIS)
            goto BAD_VERSION_CONDITION;
          }

        *parsed_pattern++ = META_COND_VERSION;
        *parsed_pattern++ = ge;
        *parsed_pattern++ = major;
        *parsed_pattern++ = minor;
        }

      /* All the remaining cases now require us to read a name. We cannot at
      this stage distinguish ambiguous cases such as (?(R12) which might be a
      recursion test by number or a name, because the named groups have not yet
      all been identified. Those cases are treated as names, but given a
      different META code. */

      else
        {
        BOOL was_r_ampersand = FALSE;

        if (*ptr == CHAR_R && ptrend - ptr > 1 && ptr[1] == CHAR_AMPERSAND)
          {
          terminator = CHAR_RIGHT_PARENTHESIS;
          was_r_ampersand = TRUE;
          ptr++;
          }
        else if (*ptr == CHAR_LESS_THAN_SIGN)
          terminator = CHAR_GREATER_THAN_SIGN;
        else if (*ptr == CHAR_APOSTROPHE)
          terminator = CHAR_APOSTROPHE;
        else
          {
          terminator = CHAR_RIGHT_PARENTHESIS;
          ptr--;   /* Point to char before name */
          }
        if (!read_name(&ptr, ptrend, utf, terminator, &offset, &name, &namelen,
            &errorcode, cb)) goto FAILED;

        /* Handle (?(R&name) */

        if (was_r_ampersand)
          {
          *parsed_pattern = META_COND_RNAME;
          ptr--;   /* Back to closing parens */
          }

        /* Handle (?(name). If the name is "DEFINE" we identify it with a
        special code. Likewise if the name consists of R followed only by
        digits. Otherwise, handle it like a quoted name. */

        else if (terminator == CHAR_RIGHT_PARENTHESIS)
          {
          if (namelen == 6 && PRIV(strncmp_c8)(name, STRING_DEFINE, 6) == 0)
            *parsed_pattern = META_COND_DEFINE;
          else
            {
            for (i = 1; i < (int)namelen; i++)
              if (!IS_DIGIT(name[i])) break;
            *parsed_pattern = (*name == CHAR_R && i >= (int)namelen)?
              META_COND_RNUMBER : META_COND_NAME;
            }
          ptr--;   /* Back to closing parens */
          }

        /* Handle (?('name') or (?(<name>) */

        else *parsed_pattern = META_COND_NAME;

        /* All these cases except DEFINE end with the name length and offset;
        DEFINE just has an offset (for the "too many branches" error). */

        if (*parsed_pattern++ != META_COND_DEFINE) *parsed_pattern++ = namelen;
        PUTOFFSET(offset, parsed_pattern);
        }  /* End cases that read a name */

      /* Check the closing parenthesis of the condition */

      if (ptr >= ptrend || *ptr != CHAR_RIGHT_PARENTHESIS)
        {
        errorcode = ERR24;
        goto FAILED;
        }
      ptr++;
      break;  /* End of condition processing */


      /* ---- Atomic group ---- */

      case CHAR_GREATER_THAN_SIGN:
      ATOMIC_GROUP:                          /* Come from (*atomic: */
      *parsed_pattern++ = META_ATOMIC;
      nest_depth++;
      ptr++;
      break;


      /* ---- Lookahead assertions ---- */

      case CHAR_EQUALS_SIGN:
      POSITIVE_LOOK_AHEAD:                   /* Come from (*pla: */
      *parsed_pattern++ = META_LOOKAHEAD;
      ptr++;
      goto POST_ASSERTION;

      case CHAR_EXCLAMATION_MARK:
      NEGATIVE_LOOK_AHEAD:                   /* Come from (*nla: */
      *parsed_pattern++ = META_LOOKAHEADNOT;
      ptr++;
      goto POST_ASSERTION;


      /* ---- Lookbehind assertions ---- */

      /* (?< followed by = or ! is a lookbehind assertion. Otherwise (?< is the
      start of the name of a capturing group. */

      case CHAR_LESS_THAN_SIGN:
      if (ptrend - ptr <= 1 ||
         (ptr[1] != CHAR_EQUALS_SIGN && ptr[1] != CHAR_EXCLAMATION_MARK))
        {
        terminator = CHAR_GREATER_THAN_SIGN;
        goto DEFINE_NAME;
        }
      *parsed_pattern++ = (ptr[1] == CHAR_EQUALS_SIGN)?
        META_LOOKBEHIND : META_LOOKBEHINDNOT;

      POST_LOOKBEHIND:              /* Come from (*plb: (*naplb: and (*nlb: */
      *has_lookbehind = TRUE;
      offset = (PCRE2_SIZE)(ptr - cb->start_pattern - 2);
      PUTOFFSET(offset, parsed_pattern);
      ptr += 2;
      /* Fall through */

      /* If the previous item was a condition starting (?(? an assertion,
      optionally preceded by a callout, is expected. This is checked later on,
      during actual compilation. However we need to identify this kind of
      assertion in this pass because it must not be qualified. The value of
      expect_cond_assert is set to 2 after (?(? is processed. We decrement it
      for a callout - still leaving a positive value that identifies the
      assertion. Multiple callouts or any other items will make it zero or
      less, which doesn't matter because they will cause an error later. */

      POST_ASSERTION:
      nest_depth++;
      if (prev_expect_cond_assert > 0)
        {
        if (top_nest == NULL) top_nest = (nest_save *)(cb->start_workspace);
        else if (++top_nest >= end_nests)
          {
          errorcode = ERR84;
          goto FAILED;
          }
        top_nest->nest_depth = nest_depth;
        top_nest->flags = NSF_CONDASSERT;
        top_nest->options = options & PARSE_TRACKED_OPTIONS;
        }
      break;


      /* ---- Define a named group ---- */

      /* A named group may be defined as (?'name') or (?<name>). In the latter
      case we jump to DEFINE_NAME from the disambiguation of (?< above with the
      terminator set to '>'. */

      case CHAR_APOSTROPHE:
      terminator = CHAR_APOSTROPHE;    /* Terminator */

      DEFINE_NAME:
      if (!read_name(&ptr, ptrend, utf, terminator, &offset, &name, &namelen,
          &errorcode, cb)) goto FAILED;

      /* We have a name for this capturing group. It is also assigned a number,
      which is its primary means of identification. */

      if (cb->bracount >= MAX_GROUP_NUMBER)
        {
        errorcode = ERR97;
        goto FAILED;
        }
      cb->bracount++;
      *parsed_pattern++ = META_CAPTURE | cb->bracount;
      nest_depth++;

      /* Check not too many names */

      if (cb->names_found >= MAX_NAME_COUNT)
        {
        errorcode = ERR49;
        goto FAILED;
        }

      /* Adjust the entry size to accommodate the longest name found. */

      if (namelen + IMM2_SIZE + 1 > cb->name_entry_size)
        cb->name_entry_size = (uint16_t)(namelen + IMM2_SIZE + 1);

      /* Scan the list to check for duplicates. For duplicate names, if the
      number is the same, break the loop, which causes the name to be
      discarded; otherwise, if DUPNAMES is not set, give an error.
      If it is set, allow the name with a different number, but continue
      scanning in case this is a duplicate with the same number. For
      non-duplicate names, give an error if the number is duplicated. */

      isdupname = FALSE;
      ng = cb->named_groups;
      for (i = 0; i < cb->names_found; i++, ng++)
        {
        if (namelen == ng->length &&
            PRIV(strncmp)(name, ng->name, (PCRE2_SIZE)namelen) == 0)
          {
          if (ng->number == cb->bracount) break;
          if ((options & PCRE2_DUPNAMES) == 0)
            {
            errorcode = ERR43;
            goto FAILED;
            }
          isdupname = ng->isdup = TRUE;     /* Mark as a duplicate */
          cb->dupnames = TRUE;              /* Duplicate names exist */
          }
        else if (ng->number == cb->bracount)
          {
          errorcode = ERR65;
          goto FAILED;
          }
        }

      if (i < cb->names_found) break;   /* Ignore duplicate with same number */

      /* Increase the list size if necessary */

      if (cb->names_found >= cb->named_group_list_size)
        {
        uint32_t newsize = cb->named_group_list_size * 2;
        named_group *newspace =
          cb->cx->memctl.malloc(newsize * sizeof(named_group),
          cb->cx->memctl.memory_data);
        if (newspace == NULL)
          {
          errorcode = ERR21;
          goto FAILED;
          }

        memcpy(newspace, cb->named_groups,
          cb->named_group_list_size * sizeof(named_group));
        if (cb->named_group_list_size > NAMED_GROUP_LIST_SIZE)
          cb->cx->memctl.free((void *)cb->named_groups,
          cb->cx->memctl.memory_data);
        cb->named_groups = newspace;
        cb->named_group_list_size = newsize;
        }

      /* Add this name to the list */

      cb->named_groups[cb->names_found].name = name;
      cb->named_groups[cb->names_found].length = (uint16_t)namelen;
      cb->named_groups[cb->names_found].number = cb->bracount;
      cb->named_groups[cb->names_found].isdup = (uint16_t)isdupname;
      cb->names_found++;
      break;
      }        /* End of (? switch */
    break;     /* End of ( handling */


    /* ---- Branch terminators ---- */

    /* Alternation: reset the capture count if we are in a (?| group. */

    case CHAR_VERTICAL_LINE:
    if (top_nest != NULL && top_nest->nest_depth == nest_depth &&
        (top_nest->flags & NSF_RESET) != 0)
      {
      if (cb->bracount > top_nest->max_group)
        top_nest->max_group = (uint16_t)cb->bracount;
      cb->bracount = top_nest->reset_group;
      }
    *parsed_pattern++ = META_ALT;
    break;

    /* End of group; reset the capture count to the maximum if we are in a (?|
    group and/or reset the options that are tracked during parsing. Disallow
    quantifier for a condition that is an assertion. */

    case CHAR_RIGHT_PARENTHESIS:
    okquantifier = TRUE;
    if (top_nest != NULL && top_nest->nest_depth == nest_depth)
      {
      options = (options & ~PARSE_TRACKED_OPTIONS) | top_nest->options;
      if ((top_nest->flags & NSF_RESET) != 0 &&
          top_nest->max_group > cb->bracount)
        cb->bracount = top_nest->max_group;
      if ((top_nest->flags & NSF_CONDASSERT) != 0)
        okquantifier = FALSE;

      if ((top_nest->flags & NSF_ATOMICSR) != 0)
        {
        *parsed_pattern++ = META_KET;
        }



      if (top_nest == (nest_save *)(cb->start_workspace)) top_nest = NULL;
        else top_nest--;
      }
    if (nest_depth == 0)    /* Unmatched closing parenthesis */
      {
      errorcode = ERR22;
      goto FAILED_BACK;
      }
    nest_depth--;
    *parsed_pattern++ = META_KET;
    break;
    }  /* End of switch on pattern character */
  }    /* End of main character scan loop */

/* End of pattern reached. Check for missing ) at the end of a verb name. */

if (inverbname && ptr >= ptrend)
  {
  errorcode = ERR60;
  goto FAILED;
  }

/* Manage callout for the final item */

PARSED_END:
parsed_pattern = manage_callouts(ptr, &previous_callout, auto_callout,
  parsed_pattern, cb);

/* Insert trailing items for word and line matching (features provided for the
benefit of pcre2grep). */

if ((extra_options & PCRE2_EXTRA_MATCH_LINE) != 0)
  {
  *parsed_pattern++ = META_KET;
  *parsed_pattern++ = META_DOLLAR;
  }
else if ((extra_options & PCRE2_EXTRA_MATCH_WORD) != 0)
  {
  *parsed_pattern++ = META_KET;
  *parsed_pattern++ = META_ESCAPE + ESC_b;
  }

/* Terminate the parsed pattern, then return success if all groups are closed.
Otherwise we have unclosed parentheses. */

if (parsed_pattern >= parsed_pattern_end)
  {
  errorcode = ERR63;  /* Internal error (parsed pattern overflow) */
  goto FAILED;
  }

*parsed_pattern = META_END;
if (nest_depth == 0) return 0;

UNCLOSED_PARENTHESIS:
errorcode = ERR14;

/* Come here for all failures. */

FAILED:
cb->erroroffset = (PCRE2_SIZE)(ptr - cb->start_pattern);
return errorcode;

/* Some errors need to indicate the previous character. */

FAILED_BACK:
ptr--;
goto FAILED;

/* This failure happens several times. */

BAD_VERSION_CONDITION:
errorcode = ERR79;
goto FAILED;
}



/*************************************************
*       Find first significant opcode            *
*************************************************/

/* This is called by several functions that scan a compiled expression looking
for a fixed first character, or an anchoring opcode etc. It skips over things
that do not influence this. For some calls, it makes sense to skip negative
forward and all backward assertions, and also the \b assertion; for others it
does not.

Arguments:
  code         pointer to the start of the group
  skipassert   TRUE if certain assertions are to be skipped

Returns:       pointer to the first significant opcode
*/

static const PCRE2_UCHAR*
first_significant_code(PCRE2_SPTR code, BOOL skipassert)
{
for (;;)
  {
  switch ((int)*code)
    {
    case OP_ASSERT_NOT:
    case OP_ASSERTBACK:
    case OP_ASSERTBACK_NOT:
    case OP_ASSERTBACK_NA:
    if (!skipassert) return code;
    do code += GET(code, 1); while (*code == OP_ALT);
    code += PRIV(OP_lengths)[*code];
    break;

    case OP_WORD_BOUNDARY:
    case OP_NOT_WORD_BOUNDARY:
    if (!skipassert) return code;
    /* Fall through */

    case OP_CALLOUT:
    case OP_CREF:
    case OP_DNCREF:
    case OP_RREF:
    case OP_DNRREF:
    case OP_FALSE:
    case OP_TRUE:
    code += PRIV(OP_lengths)[*code];
    break;

    case OP_CALLOUT_STR:
    code += GET(code, 1 + 2*LINK_SIZE);
    break;

    case OP_SKIPZERO:
    code += 2 + GET(code, 2) + LINK_SIZE;
    break;

    case OP_COND:
    case OP_SCOND:
    if (code[1+LINK_SIZE] != OP_FALSE ||   /* Not DEFINE */
        code[GET(code, 1)] != OP_KET)      /* More than one branch */
      return code;
    code += GET(code, 1) + 1 + LINK_SIZE;
    break;

    case OP_MARK:
    case OP_COMMIT_ARG:
    case OP_PRUNE_ARG:
    case OP_SKIP_ARG:
    case OP_THEN_ARG:
    code += code[1] + PRIV(OP_lengths)[*code];
    break;

    default:
    return code;
    }
  }
/* Control never reaches here */
}



#ifdef SUPPORT_UNICODE
/*************************************************
*           Get othercase range                  *
*************************************************/

/* This function is passed the start and end of a class range in UCP mode. It
searches up the characters, looking for ranges of characters in the "other"
case. Each call returns the next one, updating the start address. A character
with multiple other cases is returned on its own with a special return value.

Arguments:
  cptr        points to starting character value; updated
  d           end value
  ocptr       where to put start of othercase range
  odptr       where to put end of othercase range

Yield:        -1 when no more
               0 when a range is returned
              >0 the CASESET offset for char with multiple other cases
                in this case, ocptr contains the original
*/

static int
get_othercase_range(uint32_t *cptr, uint32_t d, uint32_t *ocptr,
  uint32_t *odptr)
{
uint32_t c, othercase, next;
unsigned int co;

/* Find the first character that has an other case. If it has multiple other
cases, return its case offset value. */

for (c = *cptr; c <= d; c++)
  {
  if ((co = UCD_CASESET(c)) != 0)
    {
    *ocptr = c++;   /* Character that has the set */
    *cptr = c;      /* Rest of input range */
    return (int)co;
    }
  if ((othercase = UCD_OTHERCASE(c)) != c) break;
  }

if (c > d) return -1;  /* Reached end of range */

/* Found a character that has a single other case. Search for the end of the
range, which is either the end of the input range, or a character that has zero
or more than one other cases. */

*ocptr = othercase;
next = othercase + 1;

for (++c; c <= d; c++)
  {
  if ((co = UCD_CASESET(c)) != 0 || UCD_OTHERCASE(c) != next) break;
  next++;
  }

*odptr = next - 1;     /* End of othercase range */
*cptr = c;             /* Rest of input range */
return 0;
}
#endif  /* SUPPORT_UNICODE */



/*************************************************
* Add a character or range to a class (internal) *
*************************************************/

/* This function packages up the logic of adding a character or range of
characters to a class. The character values in the arguments will be within the
valid values for the current mode (8-bit, 16-bit, UTF, etc). This function is
called only from within the "add to class" group of functions, some of which
are recursive and mutually recursive. The external entry point is
add_to_class().

Arguments:
  classbits     the bit map for characters < 256
  uchardptr     points to the pointer for extra data
  options       the options word
  cb            compile data
  start         start of range character
  end           end of range character

Returns:        the number of < 256 characters added
                the pointer to extra data is updated
*/

static unsigned int
add_to_class_internal(uint8_t *classbits, PCRE2_UCHAR **uchardptr,
  uint32_t options, compile_block *cb, uint32_t start, uint32_t end)
{
uint32_t c;
uint32_t classbits_end = (end <= 0xff ? end : 0xff);
unsigned int n8 = 0;

/* If caseless matching is required, scan the range and process alternate
cases. In Unicode, there are 8-bit characters that have alternate cases that
are greater than 255 and vice-versa. Sometimes we can just extend the original
range. */

if ((options & PCRE2_CASELESS) != 0)
  {
#ifdef SUPPORT_UNICODE
  if ((options & PCRE2_UTF) != 0)
    {
    int rc;
    uint32_t oc, od;

    options &= ~PCRE2_CASELESS;   /* Remove for recursive calls */
    c = start;

    while ((rc = get_othercase_range(&c, end, &oc, &od)) >= 0)
      {
      /* Handle a single character that has more than one other case. */

      if (rc > 0) n8 += add_list_to_class_internal(classbits, uchardptr, options, cb,
        PRIV(ucd_caseless_sets) + rc, oc);

      /* Do nothing if the other case range is within the original range. */

      else if (oc >= cb->class_range_start && od <= cb->class_range_end) continue;

      /* Extend the original range if there is overlap, noting that if oc < c, we
      can't have od > end because a subrange is always shorter than the basic
      range. Otherwise, use a recursive call to add the additional range. */

      else if (oc < start && od >= start - 1) start = oc; /* Extend downwards */
      else if (od > end && oc <= end + 1)
        {
        end = od;       /* Extend upwards */
        if (end > classbits_end) classbits_end = (end <= 0xff ? end : 0xff);
        }
      else n8 += add_to_class_internal(classbits, uchardptr, options, cb, oc, od);
      }
    }
  else
#endif  /* SUPPORT_UNICODE */

  /* Not UTF mode */

  for (c = start; c <= classbits_end; c++)
    {
    SETBIT(classbits, cb->fcc[c]);
    n8++;
    }
  }

/* Now handle the originally supplied range. Adjust the final value according
to the bit length - this means that the same lists of (e.g.) horizontal spaces
can be used in all cases. */

if ((options & PCRE2_UTF) == 0 && end > MAX_NON_UTF_CHAR)
  end = MAX_NON_UTF_CHAR;

if (start > cb->class_range_start && end < cb->class_range_end) return n8;

/* Use the bitmap for characters < 256. Otherwise use extra data.*/

for (c = start; c <= classbits_end; c++)
  {
  /* Regardless of start, c will always be <= 255. */
  SETBIT(classbits, c);
  n8++;
  }

#ifdef SUPPORT_WIDE_CHARS
if (start <= 0xff) start = 0xff + 1;

if (end >= start)
  {
  PCRE2_UCHAR *uchardata = *uchardptr;

#ifdef SUPPORT_UNICODE
  if ((options & PCRE2_UTF) != 0)
    {
    if (start < end)
      {
      *uchardata++ = XCL_RANGE;
      uchardata += PRIV(ord2utf)(start, uchardata);
      uchardata += PRIV(ord2utf)(end, uchardata);
      }
    else if (start == end)
      {
      *uchardata++ = XCL_SINGLE;
      uchardata += PRIV(ord2utf)(start, uchardata);
      }
    }
  else
#endif  /* SUPPORT_UNICODE */

  /* Without UTF support, character values are constrained by the bit length,
  and can only be > 256 for 16-bit and 32-bit libraries. */

#if PCRE2_CODE_UNIT_WIDTH == 8
    {}
#else
  if (start < end)
    {
    *uchardata++ = XCL_RANGE;
    *uchardata++ = start;
    *uchardata++ = end;
    }
  else if (start == end)
    {
    *uchardata++ = XCL_SINGLE;
    *uchardata++ = start;
    }
#endif  /* PCRE2_CODE_UNIT_WIDTH == 8 */
  *uchardptr = uchardata;   /* Updata extra data pointer */
  }
#else  /* SUPPORT_WIDE_CHARS */
  (void)uchardptr;          /* Avoid compiler warning */
#endif /* SUPPORT_WIDE_CHARS */

return n8;    /* Number of 8-bit characters */
}



#ifdef SUPPORT_UNICODE
/*************************************************
* Add a list of characters to a class (internal) *
*************************************************/

/* This function is used for adding a list of case-equivalent characters to a
class when in UTF mode. This function is called only from within
add_to_class_internal(), with which it is mutually recursive.

Arguments:
  classbits     the bit map for characters < 256
  uchardptr     points to the pointer for extra data
  options       the options word
  cb            contains pointers to tables etc.
  p             points to row of 32-bit values, terminated by NOTACHAR
  except        character to omit; this is used when adding lists of
                  case-equivalent characters to avoid including the one we
                  already know about

Returns:        the number of < 256 characters added
                the pointer to extra data is updated
*/

static unsigned int
add_list_to_class_internal(uint8_t *classbits, PCRE2_UCHAR **uchardptr,
  uint32_t options, compile_block *cb, const uint32_t *p, unsigned int except)
{
unsigned int n8 = 0;
while (p[0] < NOTACHAR)
  {
  unsigned int n = 0;
  if (p[0] != except)
    {
    while(p[n+1] == p[0] + n + 1) n++;
    n8 += add_to_class_internal(classbits, uchardptr, options, cb, p[0], p[n]);
    }
  p += n + 1;
  }
return n8;
}
#endif



/*************************************************
*   External entry point for add range to class  *
*************************************************/

/* This function sets the overall range so that the internal functions can try
to avoid duplication when handling case-independence.

Arguments:
  classbits     the bit map for characters < 256
  uchardptr     points to the pointer for extra data
  options       the options word
  cb            compile data
  start         start of range character
  end           end of range character

Returns:        the number of < 256 characters added
                the pointer to extra data is updated
*/

static unsigned int
add_to_class(uint8_t *classbits, PCRE2_UCHAR **uchardptr, uint32_t options,
  compile_block *cb, uint32_t start, uint32_t end)
{
cb->class_range_start = start;
cb->class_range_end = end;
return add_to_class_internal(classbits, uchardptr, options, cb, start, end);
}


/*************************************************
*   External entry point for add list to class   *
*************************************************/

/* This function is used for adding a list of horizontal or vertical whitespace
characters to a class. The list must be in order so that ranges of characters
can be detected and handled appropriately. This function sets the overall range
so that the internal functions can try to avoid duplication when handling
case-independence.

Arguments:
  classbits     the bit map for characters < 256
  uchardptr     points to the pointer for extra data
  options       the options word
  cb            contains pointers to tables etc.
  p             points to row of 32-bit values, terminated by NOTACHAR
  except        character to omit; this is used when adding lists of
                  case-equivalent characters to avoid including the one we
                  already know about

Returns:        the number of < 256 characters added
                the pointer to extra data is updated
*/

static unsigned int
add_list_to_class(uint8_t *classbits, PCRE2_UCHAR **uchardptr, uint32_t options,
  compile_block *cb, const uint32_t *p, unsigned int except)
{
unsigned int n8 = 0;
while (p[0] < NOTACHAR)
  {
  unsigned int n = 0;
  if (p[0] != except)
    {
    while(p[n+1] == p[0] + n + 1) n++;
    cb->class_range_start = p[0];
    cb->class_range_end = p[n];
    n8 += add_to_class_internal(classbits, uchardptr, options, cb, p[0], p[n]);
    }
  p += n + 1;
  }
return n8;
}



/*************************************************
*    Add characters not in a list to a class     *
*************************************************/

/* This function is used for adding the complement of a list of horizontal or
vertical whitespace to a class. The list must be in order.

Arguments:
  classbits     the bit map for characters < 256
  uchardptr     points to the pointer for extra data
  options       the options word
  cb            contains pointers to tables etc.
  p             points to row of 32-bit values, terminated by NOTACHAR

Returns:        the number of < 256 characters added
                the pointer to extra data is updated
*/

static unsigned int
add_not_list_to_class(uint8_t *classbits, PCRE2_UCHAR **uchardptr,
  uint32_t options, compile_block *cb, const uint32_t *p)
{
BOOL utf = (options & PCRE2_UTF) != 0;
unsigned int n8 = 0;
if (p[0] > 0)
  n8 += add_to_class(classbits, uchardptr, options, cb, 0, p[0] - 1);
while (p[0] < NOTACHAR)
  {
  while (p[1] == p[0] + 1) p++;
  n8 += add_to_class(classbits, uchardptr, options, cb, p[0] + 1,
    (p[1] == NOTACHAR) ? (utf ? 0x10ffffu : 0xffffffffu) : p[1] - 1);
  p++;
  }
return n8;
}



/*************************************************
*    Find details of duplicate group names       *
*************************************************/

/* This is called from compile_branch() when it needs to know the index and
count of duplicates in the names table when processing named backreferences,
either directly, or as conditions.

Arguments:
  name          points to the name
  length        the length of the name
  indexptr      where to put the index
  countptr      where to put the count of duplicates
  errorcodeptr  where to put an error code
  cb            the compile block

Returns:        TRUE if OK, FALSE if not, error code set
*/

static BOOL
find_dupname_details(PCRE2_SPTR name, uint32_t length, int *indexptr,
  int *countptr, int *errorcodeptr, compile_block *cb)
{
uint32_t i, groupnumber;
int count;
PCRE2_UCHAR *slot = cb->name_table;

/* Find the first entry in the table */

for (i = 0; i < cb->names_found; i++)
  {
  if (PRIV(strncmp)(name, slot+IMM2_SIZE, length) == 0 &&
      slot[IMM2_SIZE+length] == 0) break;
  slot += cb->name_entry_size;
  }

/* This should not occur, because this function is called only when we know we
have duplicate names. Give an internal error. */

if (i >= cb->names_found)
  {
  *errorcodeptr = ERR53;
  cb->erroroffset = name - cb->start_pattern;
  return FALSE;
  }

/* Record the index and then see how many duplicates there are, updating the
backref map and maximum back reference as we do. */

*indexptr = i;
count = 0;

for (;;)
  {
  count++;
  groupnumber = GET2(slot,0);
  cb->backref_map |= (groupnumber < 32)? (1u << groupnumber) : 1;
  if (groupnumber > cb->top_backref) cb->top_backref = groupnumber;
  if (++i >= cb->names_found) break;
  slot += cb->name_entry_size;
  if (PRIV(strncmp)(name, slot+IMM2_SIZE, length) != 0 ||
    (slot+IMM2_SIZE)[length] != 0) break;
  }

*countptr = count;
return TRUE;
}



/*************************************************
*           Compile one branch                   *
*************************************************/

/* Scan the parsed pattern, compiling it into the a vector of PCRE2_UCHAR. If
the options are changed during the branch, the pointer is used to change the
external options bits. This function is used during the pre-compile phase when
we are trying to find out the amount of memory needed, as well as during the
real compile phase. The value of lengthptr distinguishes the two phases.

Arguments:
  optionsptr        pointer to the option bits
  codeptr           points to the pointer to the current code point
  pptrptr           points to the current parsed pattern pointer
  errorcodeptr      points to error code variable
  firstcuptr        place to put the first required code unit
  firstcuflagsptr   place to put the first code unit flags, or a negative number
  reqcuptr          place to put the last required code unit
  reqcuflagsptr     place to put the last required code unit flags, or a negative number
  bcptr             points to current branch chain
  cb                contains pointers to tables etc.
  lengthptr         NULL during the real compile phase
                    points to length accumulator during pre-compile phase

Returns:            0 There's been an error, *errorcodeptr is non-zero
                   +1 Success, this branch must match at least one character
                   -1 Success, this branch may match an empty string
*/

static int
compile_branch(uint32_t *optionsptr, PCRE2_UCHAR **codeptr, uint32_t **pptrptr,
  int *errorcodeptr, uint32_t *firstcuptr, int32_t *firstcuflagsptr,
  uint32_t *reqcuptr, int32_t *reqcuflagsptr, branch_chain *bcptr,
  compile_block *cb, PCRE2_SIZE *lengthptr)
{
int bravalue = 0;
int okreturn = -1;
int group_return = 0;
uint32_t repeat_min = 0, repeat_max = 0;      /* To please picky compilers */
uint32_t greedy_default, greedy_non_default;
uint32_t repeat_type, op_type;
uint32_t options = *optionsptr;               /* May change dynamically */
uint32_t firstcu, reqcu;
uint32_t zeroreqcu, zerofirstcu;
uint32_t escape;
uint32_t *pptr = *pptrptr;
uint32_t meta, meta_arg;
int32_t firstcuflags, reqcuflags;
int32_t zeroreqcuflags, zerofirstcuflags;
int32_t req_caseopt, reqvary, tempreqvary;
PCRE2_SIZE offset = 0;
PCRE2_SIZE length_prevgroup = 0;
PCRE2_UCHAR *code = *codeptr;
PCRE2_UCHAR *last_code = code;
PCRE2_UCHAR *orig_code = code;
PCRE2_UCHAR *tempcode;
PCRE2_UCHAR *previous = NULL;
PCRE2_UCHAR op_previous;
BOOL groupsetfirstcu = FALSE;
BOOL had_accept = FALSE;
BOOL matched_char = FALSE;
BOOL previous_matched_char = FALSE;
BOOL reset_caseful = FALSE;
const uint8_t *cbits = cb->cbits;
uint8_t classbits[32];

/* We can fish out the UTF setting once and for all into a BOOL, but we must
not do this for other options (e.g. PCRE2_EXTENDED) because they may change
dynamically as we process the pattern. */

#ifdef SUPPORT_UNICODE
BOOL utf = (options & PCRE2_UTF) != 0;
#else  /* No UTF support */
BOOL utf = FALSE;
#endif

/* Helper variables for OP_XCLASS opcode (for characters > 255). We define
class_uchardata always so that it can be passed to add_to_class() always,
though it will not be used in non-UTF 8-bit cases. This avoids having to supply
alternative calls for the different cases. */

PCRE2_UCHAR *class_uchardata;
#ifdef SUPPORT_WIDE_CHARS
BOOL xclass;
PCRE2_UCHAR *class_uchardata_base;
#endif

/* Set up the default and non-default settings for greediness */

greedy_default = ((options & PCRE2_UNGREEDY) != 0);
greedy_non_default = greedy_default ^ 1;

/* Initialize no first unit, no required unit. REQ_UNSET means "no char
matching encountered yet". It gets changed to REQ_NONE if we hit something that
matches a non-fixed first unit; reqcu just remains unset if we never find one.

When we hit a repeat whose minimum is zero, we may have to adjust these values
to take the zero repeat into account. This is implemented by setting them to
zerofirstcu and zeroreqcu when such a repeat is encountered. The individual
item types that can be repeated set these backoff variables appropriately. */

firstcu = reqcu = zerofirstcu = zeroreqcu = 0;
firstcuflags = reqcuflags = zerofirstcuflags = zeroreqcuflags = REQ_UNSET;

/* The variable req_caseopt contains either the REQ_CASELESS value or zero,
according to the current setting of the caseless flag. The REQ_CASELESS value
leaves the lower 28 bit empty. It is added into the firstcu or reqcu variables
to record the case status of the value. This is used only for ASCII characters.
*/

req_caseopt = ((options & PCRE2_CASELESS) != 0)? REQ_CASELESS:0;

/* Switch on next META item until the end of the branch */

for (;; pptr++)
  {
#ifdef SUPPORT_WIDE_CHARS
  BOOL xclass_has_prop;
#endif
  BOOL negate_class;
  BOOL should_flip_negation;
  BOOL match_all_or_no_wide_chars;
  BOOL possessive_quantifier;
  BOOL note_group_empty;
  int class_has_8bitchar;
  int i;
  uint32_t mclength;
  uint32_t skipunits;
  uint32_t subreqcu, subfirstcu;
  uint32_t groupnumber;
  uint32_t verbarglen, verbculen;
  int32_t subreqcuflags, subfirstcuflags;  /* Must be signed */
  open_capitem *oc;
  PCRE2_UCHAR mcbuffer[8];

  /* Get next META item in the pattern and its potential argument. */

  meta = META_CODE(*pptr);
  meta_arg = META_DATA(*pptr);

  /* If we are in the pre-compile phase, accumulate the length used for the
  previous cycle of this loop, unless the next item is a quantifier. */

  if (lengthptr != NULL)
    {
    if (code > cb->start_workspace + cb->workspace_size -
        WORK_SIZE_SAFETY_MARGIN)                       /* Check for overrun */
      {
      *errorcodeptr = (code >= cb->start_workspace + cb->workspace_size)?
        ERR52 : ERR86;
      return 0;
      }

    /* There is at least one situation where code goes backwards: this is the
    case of a zero quantifier after a class (e.g. [ab]{0}). When the quantifier
    is processed, the whole class is eliminated. However, it is created first,
    so we have to allow memory for it. Therefore, don't ever reduce the length
    at this point. */

    if (code < last_code) code = last_code;

    /* If the next thing is not a quantifier, we add the length of the previous
    item into the total, and reset the code pointer to the start of the
    workspace. Otherwise leave the previous item available to be quantified. */

    if (meta < META_ASTERISK || meta > META_MINMAX_QUERY)
      {
      if (OFLOW_MAX - *lengthptr < (PCRE2_SIZE)(code - orig_code))
        {
        *errorcodeptr = ERR20;   /* Integer overflow */
        return 0;
        }
      *lengthptr += (PCRE2_SIZE)(code - orig_code);
      if (*lengthptr > MAX_PATTERN_SIZE)
        {
        *errorcodeptr = ERR20;   /* Pattern is too large */
        return 0;
        }
      code = orig_code;
      }

    /* Remember where this code item starts so we can catch the "backwards"
    case above next time round. */

    last_code = code;
    }

  /* Process the next parsed pattern item. If it is not a quantifier, remember
  where it starts so that it can be quantified when a quantifier follows.
  Checking for the legality of quantifiers happens in parse_regex(), except for
  a quantifier after an assertion that is a condition. */

  if (meta < META_ASTERISK || meta > META_MINMAX_QUERY)
    {
    previous = code;
    if (matched_char && !had_accept) okreturn = 1;
    }

  previous_matched_char = matched_char;
  matched_char = FALSE;
  note_group_empty = FALSE;
  skipunits = 0;         /* Default value for most subgroups */

  switch(meta)
    {
    /* ===================================================================*/
    /* The branch terminates at pattern end or | or ) */

    case META_END:
    case META_ALT:
    case META_KET:
    *firstcuptr = firstcu;
    *firstcuflagsptr = firstcuflags;
    *reqcuptr = reqcu;
    *reqcuflagsptr = reqcuflags;
    *codeptr = code;
    *pptrptr = pptr;
    return okreturn;


    /* ===================================================================*/
    /* Handle single-character metacharacters. In multiline mode, ^ disables
    the setting of any following char as a first character. */

    case META_CIRCUMFLEX:
    if ((options & PCRE2_MULTILINE) != 0)
      {
      if (firstcuflags == REQ_UNSET)
        zerofirstcuflags = firstcuflags = REQ_NONE;
      *code++ = OP_CIRCM;
      }
    else *code++ = OP_CIRC;
    break;

    case META_DOLLAR:
    *code++ = ((options & PCRE2_MULTILINE) != 0)? OP_DOLLM : OP_DOLL;
    break;

    /* There can never be a first char if '.' is first, whatever happens about
    repeats. The value of reqcu doesn't change either. */

    case META_DOT:
    matched_char = TRUE;
    if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE;
    zerofirstcu = firstcu;
    zerofirstcuflags = firstcuflags;
    zeroreqcu = reqcu;
    zeroreqcuflags = reqcuflags;
    *code++ = ((options & PCRE2_DOTALL) != 0)? OP_ALLANY: OP_ANY;
    break;


    /* ===================================================================*/
    /* Empty character classes are allowed if PCRE2_ALLOW_EMPTY_CLASS is set.
    Otherwise, an initial ']' is taken as a data character. When empty classes
    are allowed, [] must always fail, so generate OP_FAIL, whereas [^] must
    match any character, so generate OP_ALLANY. */

    case META_CLASS_EMPTY:
    case META_CLASS_EMPTY_NOT:
    matched_char = TRUE;
    *code++ = (meta == META_CLASS_EMPTY_NOT)? OP_ALLANY : OP_FAIL;
    if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE;
    zerofirstcu = firstcu;
    zerofirstcuflags = firstcuflags;
    break;


    /* ===================================================================*/
    /* Non-empty character class. If the included characters are all < 256, we
    build a 32-byte bitmap of the permitted characters, except in the special
    case where there is only one such character. For negated classes, we build
    the map as usual, then invert it at the end. However, we use a different
    opcode so that data characters > 255 can be handled correctly.

    If the class contains characters outside the 0-255 range, a different
    opcode is compiled. It may optionally have a bit map for characters < 256,
    but those above are are explicitly listed afterwards. A flag code unit
    tells whether the bitmap is present, and whether this is a negated class or
    not. */

    case META_CLASS_NOT:
    case META_CLASS:
    matched_char = TRUE;
    negate_class = meta == META_CLASS_NOT;

    /* We can optimize the case of a single character in a class by generating
    OP_CHAR or OP_CHARI if it's positive, or OP_NOT or OP_NOTI if it's
    negative. In the negative case there can be no first char if this item is
    first, whatever repeat count may follow. In the case of reqcu, save the
    previous value for reinstating. */

    /* NOTE: at present this optimization is not effective if the only
    character in a class in 32-bit, non-UCP mode has its top bit set. */

    if (pptr[1] < META_END && pptr[2] == META_CLASS_END)
      {
#ifdef SUPPORT_UNICODE
      uint32_t d;
#endif
      uint32_t c = pptr[1];

      pptr += 2;                 /* Move on to class end */
      if (meta == META_CLASS)    /* A positive one-char class can be */
        {                        /* handled as a normal literal character. */
        meta = c;                /* Set up the character */
        goto NORMAL_CHAR_SET;
        }

      /* Handle a negative one-character class */

      zeroreqcu = reqcu;
      zeroreqcuflags = reqcuflags;
      if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE;
      zerofirstcu = firstcu;
      zerofirstcuflags = firstcuflags;

      /* For caseless UTF mode, check whether this character has more than
      one other case. If so, generate a special OP_NOTPROP item instead of
      OP_NOTI. */

#ifdef SUPPORT_UNICODE
      if (utf && (options & PCRE2_CASELESS) != 0 &&
          (d = UCD_CASESET(c)) != 0)
        {
        *code++ = OP_NOTPROP;
        *code++ = PT_CLIST;
        *code++ = d;
        break;   /* We are finished with this class */
        }
#endif
      /* Char has only one other case, or UCP not available */

      *code++ = ((options & PCRE2_CASELESS) != 0)? OP_NOTI: OP_NOT;
      code += PUTCHAR(c, code);
      break;   /* We are finished with this class */
      }        /* End of 1-char optimization */

    /* Handle character classes that contain more than just one literal
    character. If there are exactly two characters in a positive class, see if
    they are case partners. This can be optimized to generate a caseless single
    character match (which also sets first/required code units if relevant). */

    if (meta == META_CLASS && pptr[1] < META_END && pptr[2] < META_END &&
        pptr[3] == META_CLASS_END)
      {
      uint32_t c = pptr[1];

#ifdef SUPPORT_UNICODE
      if (UCD_CASESET(c) == 0)
#endif
        {
        uint32_t d;

#ifdef SUPPORT_UNICODE
        if (utf && c > 127) d = UCD_OTHERCASE(c); else
#endif
          {
#if PCRE2_CODE_UNIT_WIDTH != 8
          if (c > 255) d = c; else
#endif
          d = TABLE_GET(c, cb->fcc, c);
          }

        if (c != d && pptr[2] == d)
          {
          pptr += 3;                 /* Move on to class end */
          meta = c;
          if ((options & PCRE2_CASELESS) == 0)
            {
            reset_caseful = TRUE;
            options |= PCRE2_CASELESS;
            req_caseopt = REQ_CASELESS;
            }
          goto CLASS_CASELESS_CHAR;
          }
        }
      }

    /* If a non-extended class contains a negative special such as \S, we need
    to flip the negation flag at the end, so that support for characters > 255
    works correctly (they are all included in the class). An extended class may
    need to insert specific matching or non-matching code for wide characters.
    */

    should_flip_negation = match_all_or_no_wide_chars = FALSE;

    /* Extended class (xclass) will be used when characters > 255
    might match. */

#ifdef SUPPORT_WIDE_CHARS
    xclass = FALSE;
    class_uchardata = code + LINK_SIZE + 2;   /* For XCLASS items */
    class_uchardata_base = class_uchardata;   /* Save the start */
#endif

    /* For optimization purposes, we track some properties of the class:
    class_has_8bitchar will be non-zero if the class contains at least one
    character with a code point less than 256; xclass_has_prop will be TRUE if
    Unicode property checks are present in the class. */

    class_has_8bitchar = 0;
#ifdef SUPPORT_WIDE_CHARS
    xclass_has_prop = FALSE;
#endif

    /* Initialize the 256-bit (32-byte) bit map to all zeros. We build the map
    in a temporary bit of memory, in case the class contains fewer than two
    8-bit characters because in that case the compiled code doesn't use the bit
    map. */

    memset(classbits, 0, 32 * sizeof(uint8_t));

    /* Process items until META_CLASS_END is reached. */

    while ((meta = *(++pptr)) != META_CLASS_END)
      {
      /* Handle POSIX classes such as [:alpha:] etc. */

      if (meta == META_POSIX || meta == META_POSIX_NEG)
        {
        BOOL local_negate = (meta == META_POSIX_NEG);
        int posix_class = *(++pptr);
        int taboffset, tabopt;
        uint8_t pbits[32];

        should_flip_negation = local_negate;  /* Note negative special */

        /* If matching is caseless, upper and lower are converted to alpha.
        This relies on the fact that the class table starts with alpha,
        lower, upper as the first 3 entries. */

        if ((options & PCRE2_CASELESS) != 0 && posix_class <= 2)
          posix_class = 0;

        /* When PCRE2_UCP is set, some of the POSIX classes are converted to
        different escape sequences that use Unicode properties \p or \P.
        Others that are not available via \p or \P have to generate
        XCL_PROP/XCL_NOTPROP directly, which is done here. */

#ifdef SUPPORT_UNICODE
        if ((options & PCRE2_UCP) != 0) switch(posix_class)
          {
          case PC_GRAPH:
          case PC_PRINT:
          case PC_PUNCT:
          *class_uchardata++ = local_negate? XCL_NOTPROP : XCL_PROP;
          *class_uchardata++ = (PCRE2_UCHAR)
            ((posix_class == PC_GRAPH)? PT_PXGRAPH :
             (posix_class == PC_PRINT)? PT_PXPRINT : PT_PXPUNCT);
          *class_uchardata++ = 0;
          xclass_has_prop = TRUE;
          goto CONTINUE_CLASS;

          /* For the other POSIX classes (ascii, xdigit) we are going to
          fall through to the non-UCP case and build a bit map for
          characters with code points less than 256. However, if we are in
          a negated POSIX class, characters with code points greater than
          255 must either all match or all not match, depending on whether
          the whole class is not or is negated. For example, for
          [[:^ascii:]... they must all match, whereas for [^[:^xdigit:]...
          they must not.

          In the special case where there are no xclass items, this is
          automatically handled by the use of OP_CLASS or OP_NCLASS, but an
          explicit range is needed for OP_XCLASS. Setting a flag here
          causes the range to be generated later when it is known that
          OP_XCLASS is required. In the 8-bit library this is relevant only in
          utf mode, since no wide characters can exist otherwise. */

          default:
#if PCRE2_CODE_UNIT_WIDTH == 8
          if (utf)
#endif
          match_all_or_no_wide_chars |= local_negate;
          break;
          }
#endif  /* SUPPORT_UNICODE */

        /* In the non-UCP case, or when UCP makes no difference, we build the
        bit map for the POSIX class in a chunk of local store because we may
        be adding and subtracting from it, and we don't want to subtract bits
        that may be in the main map already. At the end we or the result into
        the bit map that is being built. */

        posix_class *= 3;

        /* Copy in the first table (always present) */

        memcpy(pbits, cbits + posix_class_maps[posix_class],
          32 * sizeof(uint8_t));

        /* If there is a second table, add or remove it as required. */

        taboffset = posix_class_maps[posix_class + 1];
        tabopt = posix_class_maps[posix_class + 2];

        if (taboffset >= 0)
          {
          if (tabopt >= 0)
            for (i = 0; i < 32; i++) pbits[i] |= cbits[(int)i + taboffset];
          else
            for (i = 0; i < 32; i++) pbits[i] &= ~cbits[(int)i + taboffset];
          }

        /* Now see if we need to remove any special characters. An option
        value of 1 removes vertical space and 2 removes underscore. */

        if (tabopt < 0) tabopt = -tabopt;
        if (tabopt == 1) pbits[1] &= ~0x3c;
          else if (tabopt == 2) pbits[11] &= 0x7f;

        /* Add the POSIX table or its complement into the main table that is
        being built and we are done. */

        if (local_negate)
          for (i = 0; i < 32; i++) classbits[i] |= ~pbits[i];
        else
          for (i = 0; i < 32; i++) classbits[i] |= pbits[i];

        /* Every class contains at least one < 256 character. */

        class_has_8bitchar = 1;
        goto CONTINUE_CLASS;    /* End of POSIX handling */
        }

      /* Other than POSIX classes, the only items we should encounter are
      \d-type escapes and literal characters (possibly as ranges). */

      if (meta == META_BIGVALUE)
        {
        meta = *(++pptr);
        goto CLASS_LITERAL;
        }

      /* Any other non-literal must be an escape */

      if (meta >= META_END)
        {
        if (META_CODE(meta) != META_ESCAPE)
          {
#ifdef DEBUG_SHOW_PARSED
          fprintf(stderr, "** Unrecognized parsed pattern item 0x%.8x "
                          "in character class\n", meta);
#endif
          *errorcodeptr = ERR89;  /* Internal error - unrecognized. */
          return 0;
          }
        escape = META_DATA(meta);

        /* Every class contains at least one < 256 character. */

        class_has_8bitchar++;

        switch(escape)
          {
          case ESC_d:
          for (i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_digit];
          break;

          case ESC_D:
          should_flip_negation = TRUE;
          for (i = 0; i < 32; i++) classbits[i] |= ~cbits[i+cbit_digit];
          break;

          case ESC_w:
          for (i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_word];
          break;

          case ESC_W:
          should_flip_negation = TRUE;
          for (i = 0; i < 32; i++) classbits[i] |= ~cbits[i+cbit_word];
          break;

          /* Perl 5.004 onwards omitted VT from \s, but restored it at Perl
          5.18. Before PCRE 8.34, we had to preserve the VT bit if it was
          previously set by something earlier in the character class.
          Luckily, the value of CHAR_VT is 0x0b in both ASCII and EBCDIC, so
          we could just adjust the appropriate bit. From PCRE 8.34 we no
          longer treat \s and \S specially. */

          case ESC_s:
          for (i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_space];
          break;

          case ESC_S:
          should_flip_negation = TRUE;
          for (i = 0; i < 32; i++) classbits[i] |= ~cbits[i+cbit_space];
          break;

          /* When adding the horizontal or vertical space lists to a class, or
          their complements, disable PCRE2_CASELESS, because it justs wastes
          time, and in the "not-x" UTF cases can create unwanted duplicates in
          the XCLASS list (provoked by characters that have more than one other
          case and by both cases being in the same "not-x" sublist). */

          case ESC_h:
          (void)add_list_to_class(classbits, &class_uchardata,
            options & ~PCRE2_CASELESS, cb, PRIV(hspace_list), NOTACHAR);
          break;

          case ESC_H:
          (void)add_not_list_to_class(classbits, &class_uchardata,
            options & ~PCRE2_CASELESS, cb, PRIV(hspace_list));
          break;

          case ESC_v:
          (void)add_list_to_class(classbits, &class_uchardata,
            options & ~PCRE2_CASELESS, cb, PRIV(vspace_list), NOTACHAR);
          break;

          case ESC_V:
          (void)add_not_list_to_class(classbits, &class_uchardata,
            options & ~PCRE2_CASELESS, cb, PRIV(vspace_list));
          break;

          /* If Unicode is not supported, \P and \p are not allowed and are
          faulted at parse time, so will never appear here. */

#ifdef SUPPORT_UNICODE
          case ESC_p:
          case ESC_P:
            {
            uint32_t ptype = *(++pptr) >> 16;
            uint32_t pdata = *pptr & 0xffff;
            *class_uchardata++ = (escape == ESC_p)? XCL_PROP : XCL_NOTPROP;
            *class_uchardata++ = ptype;
            *class_uchardata++ = pdata;
            xclass_has_prop = TRUE;
            class_has_8bitchar--;                /* Undo! */
            }
          break;
#endif
          }

        goto CONTINUE_CLASS;
        }  /* End handling \d-type escapes */

      /* A literal character may be followed by a range meta. At parse time
      there are checks for out-of-order characters, for ranges where the two
      characters are equal, and for hyphens that cannot indicate a range. At
      this point, therefore, no checking is needed. */

      else
        {
        uint32_t c, d;

        CLASS_LITERAL:
        c = d = meta;

        /* Remember if \r or \n were explicitly used */

        if (c == CHAR_CR || c == CHAR_NL) cb->external_flags |= PCRE2_HASCRORLF;

        /* Process a character range */

        if (pptr[1] == META_RANGE_LITERAL || pptr[1] == META_RANGE_ESCAPED)
          {
#ifdef EBCDIC
          BOOL range_is_literal = (pptr[1] == META_RANGE_LITERAL);
#endif
          pptr += 2;
          d = *pptr;
          if (d == META_BIGVALUE) d = *(++pptr);

          /* Remember an explicit \r or \n, and add the range to the class. */

          if (d == CHAR_CR || d == CHAR_NL) cb->external_flags |= PCRE2_HASCRORLF;

          /* In an EBCDIC environment, Perl treats alphabetic ranges specially
          because there are holes in the encoding, and simply using the range
          A-Z (for example) would include the characters in the holes. This
          applies only to literal ranges; [\xC1-\xE9] is different to [A-Z]. */

#ifdef EBCDIC
          if (range_is_literal &&
               (cb->ctypes[c] & ctype_letter) != 0 &&
               (cb->ctypes[d] & ctype_letter) != 0 &&
               (c <= CHAR_z) == (d <= CHAR_z))
            {
            uint32_t uc = (d <= CHAR_z)? 0 : 64;
            uint32_t C = c - uc;
            uint32_t D = d - uc;

            if (C <= CHAR_i)
              {
              class_has_8bitchar +=
                add_to_class(classbits, &class_uchardata, options, cb, C + uc,
                  ((D < CHAR_i)? D : CHAR_i) + uc);
              C = CHAR_j;
              }

            if (C <= D && C <= CHAR_r)
              {
              class_has_8bitchar +=
                add_to_class(classbits, &class_uchardata, options, cb, C + uc,
                  ((D < CHAR_r)? D : CHAR_r) + uc);
              C = CHAR_s;
              }

            if (C <= D)
              {
              class_has_8bitchar +=
                add_to_class(classbits, &class_uchardata, options, cb, C + uc,
                  D + uc);
              }
            }
          else
#endif
          /* Not an EBCDIC special range */

          class_has_8bitchar +=
            add_to_class(classbits, &class_uchardata, options, cb, c, d);
          goto CONTINUE_CLASS;   /* Go get the next char in the class */
          }  /* End of range handling */


        /* Handle a single character. */

        class_has_8bitchar +=
          add_to_class(classbits, &class_uchardata, options, cb, meta, meta);
        }

      /* Continue to the next item in the class. */

      CONTINUE_CLASS:

#ifdef SUPPORT_WIDE_CHARS
      /* If any wide characters or Unicode properties have been encountered,
      set xclass = TRUE. Then, in the pre-compile phase, accumulate the length
      of the extra data and reset the pointer. This is so that very large
      classes that contain a zillion wide characters or Unicode property tests
      do not overwrite the workspace (which is on the stack). */

      if (class_uchardata > class_uchardata_base)
        {
        xclass = TRUE;
        if (lengthptr != NULL)
          {
          *lengthptr += class_uchardata - class_uchardata_base;
          class_uchardata = class_uchardata_base;
          }
        }
#endif

      continue;  /* Needed to avoid error when not supporting wide chars */
      }   /* End of main class-processing loop */

    /* If this class is the first thing in the branch, there can be no first
    char setting, whatever the repeat count. Any reqcu setting must remain
    unchanged after any kind of repeat. */

    if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE;
    zerofirstcu = firstcu;
    zerofirstcuflags = firstcuflags;
    zeroreqcu = reqcu;
    zeroreqcuflags = reqcuflags;

    /* If there are characters with values > 255, or Unicode property settings
    (\p or \P), we have to compile an extended class, with its own opcode,
    unless there were no property settings and there was a negated special such
    as \S in the class, and PCRE2_UCP is not set, because in that case all
    characters > 255 are in or not in the class, so any that were explicitly
    given as well can be ignored.

    In the UCP case, if certain negated POSIX classes ([:^ascii:] or
    [^:xdigit:]) were present in a class, we either have to match or not match
    all wide characters (depending on whether the whole class is or is not
    negated). This requirement is indicated by match_all_or_no_wide_chars being
    true. We do this by including an explicit range, which works in both cases.
    This applies only in UTF and 16-bit and 32-bit non-UTF modes, since there
    cannot be any wide characters in 8-bit non-UTF mode.

    When there *are* properties in a positive UTF-8 or any 16-bit or 32_bit
    class where \S etc is present without PCRE2_UCP, causing an extended class
    to be compiled, we make sure that all characters > 255 are included by
    forcing match_all_or_no_wide_chars to be true.

    If, when generating an xclass, there are no characters < 256, we can omit
    the bitmap in the actual compiled code. */

#ifdef SUPPORT_WIDE_CHARS  /* Defined for 16/32 bits, or 8-bit with Unicode */
    if (xclass && (
#ifdef SUPPORT_UNICODE
        (options & PCRE2_UCP) != 0 ||
#endif
        xclass_has_prop || !should_flip_negation))
      {
      if (match_all_or_no_wide_chars || (
#if PCRE2_CODE_UNIT_WIDTH == 8
           utf &&
#endif
           should_flip_negation && !negate_class && (options & PCRE2_UCP) == 0))
        {
        *class_uchardata++ = XCL_RANGE;
        if (utf)   /* Will always be utf in the 8-bit library */
          {
          class_uchardata += PRIV(ord2utf)(0x100, class_uchardata);
          class_uchardata += PRIV(ord2utf)(MAX_UTF_CODE_POINT, class_uchardata);
          }
        else       /* Can only happen for the 16-bit & 32-bit libraries */
          {
#if PCRE2_CODE_UNIT_WIDTH == 16
          *class_uchardata++ = 0x100;
          *class_uchardata++ = 0xffffu;
#elif PCRE2_CODE_UNIT_WIDTH == 32
          *class_uchardata++ = 0x100;
          *class_uchardata++ = 0xffffffffu;
#endif
          }
        }
      *class_uchardata++ = XCL_END;    /* Marks the end of extra data */
      *code++ = OP_XCLASS;
      code += LINK_SIZE;
      *code = negate_class? XCL_NOT:0;
      if (xclass_has_prop) *code |= XCL_HASPROP;

      /* If the map is required, move up the extra data to make room for it;
      otherwise just move the code pointer to the end of the extra data. */

      if (class_has_8bitchar > 0)
        {
        *code++ |= XCL_MAP;
        (void)memmove(code + (32 / sizeof(PCRE2_UCHAR)), code,
          CU2BYTES(class_uchardata - code));
        if (negate_class && !xclass_has_prop)
          {
          /* Using 255 ^ instead of ~ avoids clang sanitize warning. */
          for (i = 0; i < 32; i++) classbits[i] = 255 ^ classbits[i];
          }
        memcpy(code, classbits, 32);
        code = class_uchardata + (32 / sizeof(PCRE2_UCHAR));
        }
      else code = class_uchardata;

      /* Now fill in the complete length of the item */

      PUT(previous, 1, (int)(code - previous));
      break;   /* End of class handling */
      }
#endif  /* SUPPORT_WIDE_CHARS */

    /* If there are no characters > 255, or they are all to be included or
    excluded, set the opcode to OP_CLASS or OP_NCLASS, depending on whether the
    whole class was negated and whether there were negative specials such as \S
    (non-UCP) in the class. Then copy the 32-byte map into the code vector,
    negating it if necessary. */

    *code++ = (negate_class == should_flip_negation) ? OP_CLASS : OP_NCLASS;
    if (lengthptr == NULL)    /* Save time in the pre-compile phase */
      {
      if (negate_class)
        {
       /* Using 255 ^ instead of ~ avoids clang sanitize warning. */
       for (i = 0; i < 32; i++) classbits[i] = 255 ^ classbits[i];
       }
      memcpy(code, classbits, 32);
      }
    code += 32 / sizeof(PCRE2_UCHAR);
    break;  /* End of class processing */


    /* ===================================================================*/
    /* Deal with (*VERB)s. */

    /* Check for open captures before ACCEPT and close those that are within
    the same assertion level, also converting ACCEPT to ASSERT_ACCEPT in an
    assertion. In the first pass, just accumulate the length required;
    otherwise hitting (*ACCEPT) inside many nested parentheses can cause
    workspace overflow. Do not set firstcu after *ACCEPT. */

    case META_ACCEPT:
    cb->had_accept = had_accept = TRUE;
    for (oc = cb->open_caps;
         oc != NULL && oc->assert_depth >= cb->assert_depth;
         oc = oc->next)
      {
      if (lengthptr != NULL)
        {
        *lengthptr += CU2BYTES(1) + IMM2_SIZE;
        }
      else
        {
        *code++ = OP_CLOSE;
        PUT2INC(code, 0, oc->number);
        }
      }
    *code++ = (cb->assert_depth > 0)? OP_ASSERT_ACCEPT : OP_ACCEPT;
    if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE;
    break;

    case META_PRUNE:
    case META_SKIP:
    cb->had_pruneorskip = TRUE;
    /* Fall through */
    case META_COMMIT:
    case META_FAIL:
    *code++ = verbops[(meta - META_MARK) >> 16];
    break;

    case META_THEN:
    cb->external_flags |= PCRE2_HASTHEN;
    *code++ = OP_THEN;
    break;

    /* Handle verbs with arguments. Arguments can be very long, especially in
    16- and 32-bit modes, and can overflow the workspace in the first pass.
    However, the argument length is constrained to be small enough to fit in
    one code unit. This check happens in parse_regex(). In the first pass,
    instead of putting the argument into memory, we just update the length
    counter and set up an empty argument. */

    case META_THEN_ARG:
    cb->external_flags |= PCRE2_HASTHEN;
    goto VERB_ARG;

    case META_PRUNE_ARG:
    case META_SKIP_ARG:
    cb->had_pruneorskip = TRUE;
    /* Fall through */
    case META_MARK:
    case META_COMMIT_ARG:
    VERB_ARG:
    *code++ = verbops[(meta - META_MARK) >> 16];
    /* The length is in characters. */
    verbarglen = *(++pptr);
    verbculen = 0;
    tempcode = code++;
    for (i = 0; i < (int)verbarglen; i++)
      {
      meta = *(++pptr);
#ifdef SUPPORT_UNICODE
      if (utf) mclength = PRIV(ord2utf)(meta, mcbuffer); else
#endif
        {
        mclength = 1;
        mcbuffer[0] = meta;
        }
      if (lengthptr != NULL) *lengthptr += mclength; else
        {
        memcpy(code, mcbuffer, CU2BYTES(mclength));
        code += mclength;
        verbculen += mclength;
        }
      }

    *tempcode = verbculen;   /* Fill in the code unit length */
    *code++ = 0;             /* Terminating zero */
    break;


    /* ===================================================================*/
    /* Handle options change. The new setting must be passed back for use in
    subsequent branches. Reset the greedy defaults and the case value for
    firstcu and reqcu. */

    case META_OPTIONS:
    *optionsptr = options = *(++pptr);
    greedy_default = ((options & PCRE2_UNGREEDY) != 0);
    greedy_non_default = greedy_default ^ 1;
    req_caseopt = ((options & PCRE2_CASELESS) != 0)? REQ_CASELESS : 0;
    break;


    /* ===================================================================*/
    /* Handle conditional subpatterns. The case of (?(Rdigits) is ambiguous
    because it could be a numerical check on recursion, or a name check on a
    group's being set. The pre-pass sets up META_COND_RNUMBER as a name so that
    we can handle it either way. We first try for a name; if not found, process
    the number. */

    case META_COND_RNUMBER:   /* (?(Rdigits) */
    case META_COND_NAME:      /* (?(name) or (?'name') or ?(<name>) */
    case META_COND_RNAME:     /* (?(R&name) - test for recursion */
    bravalue = OP_COND;
      {
      int count, index;
      PCRE2_SPTR name;
      named_group *ng = cb->named_groups;
      uint32_t length = *(++pptr);

      GETPLUSOFFSET(offset, pptr);
      name = cb->start_pattern + offset;

      /* In the first pass, the names generated in the pre-pass are available,
      but the main name table has not yet been created. Scan the list of names
      generated in the pre-pass in order to get a number and whether or not
      this name is duplicated. If it is not duplicated, we can handle it as a
      numerical group. */

      for (i = 0; i < cb->names_found; i++, ng++)
        {
        if (length == ng->length &&
            PRIV(strncmp)(name, ng->name, length) == 0)
          {
          if (!ng->isdup)
            {
            code[1+LINK_SIZE] = (meta == META_COND_RNAME)? OP_RREF : OP_CREF;
            PUT2(code, 2+LINK_SIZE, ng->number);
            if (ng->number > cb->top_backref) cb->top_backref = ng->number;
            skipunits = 1+IMM2_SIZE;
            goto GROUP_PROCESS_NOTE_EMPTY;
            }
          break;  /* Found a duplicated name */
          }
        }

      /* If the name was not found we have a bad reference, unless we are
      dealing with R<digits>, which is treated as a recursion test by number.
      */

      if (i >= cb->names_found)
        {
        groupnumber = 0;
        if (meta == META_COND_RNUMBER)
          {
          for (i = 1; i < (int)length; i++)
            {
            groupnumber = groupnumber * 10 + name[i] - CHAR_0;
            if (groupnumber > MAX_GROUP_NUMBER)
              {
              *errorcodeptr = ERR61;
              cb->erroroffset = offset + i;
              return 0;
              }
            }
          }

        if (meta != META_COND_RNUMBER || groupnumber > cb->bracount)
          {
          *errorcodeptr = ERR15;
          cb->erroroffset = offset;
          return 0;
          }

        /* (?Rdigits) treated as a recursion reference by number. A value of
        zero (which is the result of both (?R) and (?R0)) means "any", and is
        translated into RREF_ANY (which is 0xffff). */

        if (groupnumber == 0) groupnumber = RREF_ANY;
        code[1+LINK_SIZE] = OP_RREF;
        PUT2(code, 2+LINK_SIZE, groupnumber);
        skipunits = 1+IMM2_SIZE;
        goto GROUP_PROCESS_NOTE_EMPTY;
        }

      /* A duplicated name was found. Note that if an R<digits> name is found
      (META_COND_RNUMBER), it is a reference test, not a recursion test. */

      code[1+LINK_SIZE] = (meta == META_COND_RNAME)? OP_RREF : OP_CREF;

      /* We have a duplicated name. In the compile pass we have to search the
      main table in order to get the index and count values. */

      count = 0;  /* Values for first pass (avoids compiler warning) */
      index = 0;
      if (lengthptr == NULL && !find_dupname_details(name, length, &index,
            &count, errorcodeptr, cb)) return 0;

      /* Add one to the opcode to change CREF/RREF into DNCREF/DNRREF and
      insert appropriate data values. */

      code[1+LINK_SIZE]++;
      skipunits = 1+2*IMM2_SIZE;
      PUT2(code, 2+LINK_SIZE, index);
      PUT2(code, 2+LINK_SIZE+IMM2_SIZE, count);
      }
    goto GROUP_PROCESS_NOTE_EMPTY;

    /* The DEFINE condition is always false. Its internal groups may never
    be called, so matched_char must remain false, hence the jump to
    GROUP_PROCESS rather than GROUP_PROCESS_NOTE_EMPTY. */

    case META_COND_DEFINE:
    bravalue = OP_COND;
    GETPLUSOFFSET(offset, pptr);
    code[1+LINK_SIZE] = OP_DEFINE;
    skipunits = 1;
    goto GROUP_PROCESS;

    /* Conditional test of a group's being set. */

    case META_COND_NUMBER:
    bravalue = OP_COND;
    GETPLUSOFFSET(offset, pptr);
    groupnumber = *(++pptr);
    if (groupnumber > cb->bracount)
      {
      *errorcodeptr = ERR15;
      cb->erroroffset = offset;
      return 0;
      }
    if (groupnumber > cb->top_backref) cb->top_backref = groupnumber;
    offset -= 2;   /* Point at initial ( for too many branches error */
    code[1+LINK_SIZE] = OP_CREF;
    skipunits = 1