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godotengine
GitHub Repository: godotengine/godot
 Path: blob/master/thirdparty/pcre2/src/pcre2_chkdint.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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PCRE2_ASSERT(a >= 0 && b >= 0);

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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 pcre2_chkdint.c */

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