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Diffstat (limited to 'src/3rdparty/pcre2/src/pcre2_chkdint.c')
-rw-r--r-- | src/3rdparty/pcre2/src/pcre2_chkdint.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/3rdparty/pcre2/src/pcre2_chkdint.c b/src/3rdparty/pcre2/src/pcre2_chkdint.c new file mode 100644 index 0000000000..d04f6f8cf1 --- /dev/null +++ b/src/3rdparty/pcre2/src/pcre2_chkdint.c @@ -0,0 +1,96 @@ +/************************************************* +* 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 + Copyright (c) 2023 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. +----------------------------------------------------------------------------- +*/ + +/* This file contains functions to implement checked integer operation */ + +#ifndef PCRE2_PCRE2TEST +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "pcre2_internal.h" +#endif + +/************************************************* +* Checked Integer Multiplication * +*************************************************/ + +/* +Arguments: + r A pointer to PCRE2_SIZE to store the answer + a, b Two integers + +Returns: Bool indicating if the operation overflows + +It is modeled after C23's <stdckdint.h> interface +The INT64_OR_DOUBLE type is a 64-bit integer type when available, +otherwise double. */ + +BOOL +PRIV(ckd_smul)(PCRE2_SIZE *r, int a, int b) +{ +#ifdef HAVE_BUILTIN_MUL_OVERFLOW +PCRE2_SIZE m; + +if (__builtin_mul_overflow(a, b, &m)) return TRUE; + +*r = m; +#else +INT64_OR_DOUBLE m; + +#ifdef PCRE2_DEBUG +if (a < 0 || b < 0) abort(); +#endif + +m = (INT64_OR_DOUBLE)a * (INT64_OR_DOUBLE)b; + +#if defined INT64_MAX || defined int64_t +if (sizeof(m) > sizeof(*r) && m > (INT64_OR_DOUBLE)PCRE2_SIZE_MAX) return TRUE; +*r = (PCRE2_SIZE)m; +#else +if (m > PCRE2_SIZE_MAX) return TRUE; +*r = m; +#endif + +#endif + +return FALSE; +} + +/* End of pcre_chkdint.c */ |