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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 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
+
+#include "pcre2_internal.h"
+
+#define STRING(a) # a
+#define XSTRING(s) STRING(s)
+
+/* The texts of compile-time error messages. Compile-time error numbers start
+at COMPILE_ERROR_BASE (100).
+
+This used to be a table of strings, but in order to reduce the number of
+relocations needed when a shared library is loaded dynamically, it is now one
+long string. We cannot use a table of offsets, because the lengths of inserts
+such as XSTRING(MAX_NAME_SIZE) are not known. Instead,
+pcre2_get_error_message() counts through to the one it wants - this isn't a
+performance issue because these strings are used only when there is an error.
+
+Each substring ends with \0 to insert a null character. This includes the final
+substring, so that the whole string ends with \0\0, which can be detected when
+counting through. */
+
+static const unsigned char compile_error_texts[] =
+ "no error\0"
+ "\\ at end of pattern\0"
+ "\\c at end of pattern\0"
+ "unrecognized character follows \\\0"
+ "numbers out of order in {} quantifier\0"
+ /* 5 */
+ "number too big in {} quantifier\0"
+ "missing terminating ] for character class\0"
+ "invalid escape sequence in character class\0"
+ "range out of order in character class\0"
+ "quantifier does not follow a repeatable item\0"
+ /* 10 */
+ "internal error: unexpected repeat\0"
+ "unrecognized character after (? or (?-\0"
+ "POSIX named classes are supported only within a class\0"
+ "POSIX collating elements are not supported\0"
+ "missing closing parenthesis\0"
+ /* 15 */
+ "reference to non-existent subpattern\0"
+ "pattern passed as NULL\0"
+ "unrecognised compile-time option bit(s)\0"
+ "missing ) after (?# comment\0"
+ "parentheses are too deeply nested\0"
+ /* 20 */
+ "regular expression is too large\0"
+ "failed to allocate heap memory\0"
+ "unmatched closing parenthesis\0"
+ "internal error: code overflow\0"
+ "letter or underscore expected after (?< or (?'\0"
+ /* 25 */
+ "lookbehind assertion is not fixed length\0"
+ "malformed number or name after (?(\0"
+ "conditional group contains more than two branches\0"
+ "assertion expected after (?( or (?(?C)\0"
+ "(?R or (?[+-]digits must be followed by )\0"
+ /* 30 */
+ "unknown POSIX class name\0"
+ "internal error in pcre2_study(): should not occur\0"
+ "this version of PCRE2 does not have Unicode support\0"
+ "parentheses are too deeply nested (stack check)\0"
+ "character code point value in \\x{} or \\o{} is too large\0"
+ /* 35 */
+ "invalid condition (?(0)\0"
+ "\\C is not allowed in a lookbehind assertion in UTF-" XSTRING(PCRE2_CODE_UNIT_WIDTH) " mode\0"
+ "PCRE does not support \\L, \\l, \\N{name}, \\U, or \\u\0"
+ "number after (?C is greater than 255\0"
+ "closing parenthesis for (?C expected\0"
+ /* 40 */
+ "invalid escape sequence in (*VERB) name\0"
+ "unrecognized character after (?P\0"
+ "syntax error in subpattern name (missing terminator)\0"
+ "two named subpatterns have the same name (PCRE2_DUPNAMES not set)\0"
+ "group name must start with a non-digit\0"
+ /* 45 */
+ "this version of PCRE2 does not have support for \\P, \\p, or \\X\0"
+ "malformed \\P or \\p sequence\0"
+ "unknown property name after \\P or \\p\0"
+ "subpattern name is too long (maximum " XSTRING(MAX_NAME_SIZE) " characters)\0"
+ "too many named subpatterns (maximum " XSTRING(MAX_NAME_COUNT) ")\0"
+ /* 50 */
+ "invalid range in character class\0"
+ "octal value is greater than \\377 in 8-bit non-UTF-8 mode\0"
+ "internal error: overran compiling workspace\0"
+ "internal error: previously-checked referenced subpattern not found\0"
+ "DEFINE group contains more than one branch\0"
+ /* 55 */
+ "missing opening brace after \\o\0"
+ "internal error: unknown newline setting\0"
+ "\\g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number\0"
+ "a numbered reference must not be zero\0"
+ "an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT)\0"
+ /* 60 */
+ "(*VERB) not recognized or malformed\0"
+ "number is too big\0"
+ "subpattern name expected\0"
+ "digit expected after (?+\0"
+ "non-octal character in \\o{} (closing brace missing?)\0"
+ /* 65 */
+ "different names for subpatterns of the same number are not allowed\0"
+ "(*MARK) must have an argument\0"
+ "non-hex character in \\x{} (closing brace missing?)\0"
+#ifndef EBCDIC
+ "\\c must be followed by a printable ASCII character\0"
+#else
+ "\\c must be followed by a letter or one of [\\]^_?\0"
+#endif
+ "\\k is not followed by a braced, angle-bracketed, or quoted name\0"
+ /* 70 */
+ "internal error: unknown opcode in find_fixedlength()\0"
+ "\\N is not supported in a class\0"
+ "SPARE ERROR\0"
+ "disallowed Unicode code point (>= 0xd800 && <= 0xdfff)\0"
+ "using UTF is disabled by the application\0"
+ /* 75 */
+ "using UCP is disabled by the application\0"
+ "name is too long in (*MARK), (*PRUNE), (*SKIP), or (*THEN)\0"
+ "character code point value in \\u.... sequence is too large\0"
+ "digits missing in \\x{} or \\o{}\0"
+ "syntax error in (?(VERSION condition\0"
+ /* 80 */
+ "internal error: unknown opcode in auto_possessify()\0"
+ "missing terminating delimiter for callout with string argument\0"
+ "unrecognized string delimiter follows (?C\0"
+ "using \\C is disabled by the application\0"
+ "(?| and/or (?J: or (?x: parentheses are too deeply nested\0"
+ /* 85 */
+ "using \\C is disabled in this PCRE2 library\0"
+ "regular expression is too complicated\0"
+ "lookbehind assertion is too long\0"
+ "pattern string is longer than the limit set by the application\0"
+ ;
+
+/* Match-time and UTF error texts are in the same format. */
+
+static const unsigned char match_error_texts[] =
+ "no error\0"
+ "no match\0"
+ "partial match\0"
+ "UTF-8 error: 1 byte missing at end\0"
+ "UTF-8 error: 2 bytes missing at end\0"
+ /* 5 */
+ "UTF-8 error: 3 bytes missing at end\0"
+ "UTF-8 error: 4 bytes missing at end\0"
+ "UTF-8 error: 5 bytes missing at end\0"
+ "UTF-8 error: byte 2 top bits not 0x80\0"
+ "UTF-8 error: byte 3 top bits not 0x80\0"
+ /* 10 */
+ "UTF-8 error: byte 4 top bits not 0x80\0"
+ "UTF-8 error: byte 5 top bits not 0x80\0"
+ "UTF-8 error: byte 6 top bits not 0x80\0"
+ "UTF-8 error: 5-byte character is not allowed (RFC 3629)\0"
+ "UTF-8 error: 6-byte character is not allowed (RFC 3629)\0"
+ /* 15 */
+ "UTF-8 error: code points greater than 0x10ffff are not defined\0"
+ "UTF-8 error: code points 0xd800-0xdfff are not defined\0"
+ "UTF-8 error: overlong 2-byte sequence\0"
+ "UTF-8 error: overlong 3-byte sequence\0"
+ "UTF-8 error: overlong 4-byte sequence\0"
+ /* 20 */
+ "UTF-8 error: overlong 5-byte sequence\0"
+ "UTF-8 error: overlong 6-byte sequence\0"
+ "UTF-8 error: isolated byte with 0x80 bit set\0"
+ "UTF-8 error: illegal byte (0xfe or 0xff)\0"
+ "UTF-16 error: missing low surrogate at end\0"
+ /* 25 */
+ "UTF-16 error: invalid low surrogate\0"
+ "UTF-16 error: isolated low surrogate\0"
+ "UTF-32 error: code points 0xd800-0xdfff are not defined\0"
+ "UTF-32 error: code points greater than 0x10ffff are not defined\0"
+ "bad data value\0"
+ /* 30 */
+ "patterns do not all use the same character tables\0"
+ "magic number missing\0"
+ "pattern compiled in wrong mode: 8/16/32-bit error\0"
+ "bad offset value\0"
+ "bad option value\0"
+ /* 35 */
+ "invalid replacement string\0"
+ "bad offset into UTF string\0"
+ "callout error code\0" /* Never returned by PCRE2 itself */
+ "invalid data in workspace for DFA restart\0"
+ "too much recursion for DFA matching\0"
+ /* 40 */
+ "backreference condition or recursion test is not supported for DFA matching\0"
+ "function is not supported for DFA matching\0"
+ "pattern contains an item that is not supported for DFA matching\0"
+ "workspace size exceeded in DFA matching\0"
+ "internal error - pattern overwritten?\0"
+ /* 45 */
+ "bad JIT option\0"
+ "JIT stack limit reached\0"
+ "match limit exceeded\0"
+ "no more memory\0"
+ "unknown substring\0"
+ /* 50 */
+ "non-unique substring name\0"
+ "NULL argument passed\0"
+ "nested recursion at the same subject position\0"
+ "recursion limit exceeded\0"
+ "requested value is not available\0"
+ /* 55 */
+ "requested value is not set\0"
+ "offset limit set without PCRE2_USE_OFFSET_LIMIT\0"
+ "bad escape sequence in replacement string\0"
+ "expected closing curly bracket in replacement string\0"
+ "bad substitution in replacement string\0"
+ /* 60 */
+ "match with end before start is not supported\0"
+ "too many replacements (more than INT_MAX)\0"
+ "bad serialized data\0"
+ ;
+
+
+/*************************************************
+* Return error message *
+*************************************************/
+
+/* This function copies an error message into a buffer whose units are of an
+appropriate width. Error numbers are positive for compile-time errors, and
+negative for match-time errors (except for UTF errors), but the numbers are all
+distinct.
+
+Arguments:
+ enumber error number
+ buffer where to put the message (zero terminated)
+ size size of the buffer
+
+Returns: length of message if all is well
+ negative on error
+*/
+
+PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION
+pcre2_get_error_message(int enumber, PCRE2_UCHAR *buffer, size_t size)
+{
+const unsigned char *message;
+size_t i;
+int n;
+
+if (size == 0) return PCRE2_ERROR_NOMEMORY;
+
+if (enumber >= COMPILE_ERROR_BASE) /* Compile error */
+ {
+ message = compile_error_texts;
+ n = enumber - COMPILE_ERROR_BASE;
+ }
+else if (enumber < 0) /* Match or UTF error */
+ {
+ message = match_error_texts;
+ n = -enumber;
+ }
+else /* Invalid error number */
+ {
+ message = (unsigned char *)"\0"; /* Empty message list */
+ n = 1;
+ }
+
+for (; n > 0; n--)
+ {
+ while (*message++ != CHAR_NULL) {};
+ if (*message == CHAR_NULL) return PCRE2_ERROR_BADDATA;
+ }
+
+for (i = 0; *message != 0; i++)
+ {
+ if (i >= size - 1)
+ {
+ buffer[i] = 0; /* Terminate partial message */
+ return PCRE2_ERROR_NOMEMORY;
+ }
+ buffer[i] = *message++;
+ }
+
+buffer[i] = 0;
+return (int)i;
+}
+
+/* End of pcre2_error.c */
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