zathura/zathura/checked-integer-arithmetic.c

/* SPDX-License-Identifier: Zlib */

#include "checked-integer-arithmetic.h"
#include <stdint.h>
#include <limits.h>

#ifndef HAVE_BUILTIN
bool
checked_umul(unsigned int lhs, unsigned int rhs, unsigned int* res)
{
  const uint64_t r = (uint64_t) lhs * (uint64_t) rhs;
  *res = (unsigned int) r;

  return r > UINT_MAX;
}
#endif