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39 lines
919 B
C
39 lines
919 B
C
/* See LICENSE file for license and copyright information */
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#ifndef ZATHURA_CHECKED_INTEGER_ARITHMETIC_H
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#define ZATHURA_CHECKED_INTEGER_ARITHMETIC_H
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#include "macros.h"
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#include <stdbool.h>
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#if __GNUC__ >= 5
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#define HAVE_BUILTIN
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#elif defined(__clang__)
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#if __has_builtin(__builtin_add_overflow)
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#define HAVE_BUILTIN
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#endif
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef HAVE_BUILTIN
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#define checked_umul(lhs, rhs, res) __builtin_umul_overflow((lhs), (rhs), (res))
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#else
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/**
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* Helper function for multiplication with overflow detection. This function has
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* the same semantics as the __builtin_*mul_overflow functions.
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*
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* @param[in] lhs first operand
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* @param[in] rhs second operand
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* @param[out] res result
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* @return true if an overflow occurred, false otherwise
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*/
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GIRARA_HIDDEN bool checked_umul(unsigned int lhs, unsigned int rhs, unsigned int* res);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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