97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
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/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Copyright (c) 2023 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This file contains functions to implement checked integer operation */
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#ifndef PCRE2_PCRE2TEST
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "pcre2_internal.h"
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#endif
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/*************************************************
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* Checked Integer Multiplication *
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*************************************************/
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/*
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Arguments:
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r A pointer to PCRE2_SIZE to store the answer
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a, b Two integers
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Returns: Bool indicating if the operation overflows
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It is modeled after C23's <stdckdint.h> interface
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The INT64_OR_DOUBLE type is a 64-bit integer type when available,
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otherwise double. */
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BOOL
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PRIV(ckd_smul)(PCRE2_SIZE *r, int a, int b)
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{
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#ifdef HAVE_BUILTIN_MUL_OVERFLOW
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PCRE2_SIZE m;
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if (__builtin_mul_overflow(a, b, &m)) return TRUE;
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*r = m;
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#else
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INT64_OR_DOUBLE m;
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#ifdef PCRE2_DEBUG
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if (a < 0 || b < 0) abort();
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#endif
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m = (INT64_OR_DOUBLE)a * (INT64_OR_DOUBLE)b;
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#if defined INT64_MAX || defined int64_t
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if (sizeof(m) > sizeof(*r) && m > (INT64_OR_DOUBLE)PCRE2_SIZE_MAX) return TRUE;
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*r = (PCRE2_SIZE)m;
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#else
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if (m > PCRE2_SIZE_MAX) return TRUE;
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*r = m;
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#endif
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#endif
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return FALSE;
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}
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/* End of pcre_chkdint.c */
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