Function xmul

utils.c:986–1000

* Return a * b if it would not overflow. * Die with an "out of memory" error if it would. */

 * Die with an "out of memory" error if it would.
 */
static size_t
xmul (size_t a, size_t b)
{
#if defined(__GNUC__) && __GNUC__ >= 5
  size_t result;
  if (__builtin_mul_overflow (a, b, &result))
    die_oom ();
  return result;
#else
  if (b != 0 && a > SIZE_MAX / b)
    die_oom ();

  return a * b;
#endif
}

void
strappend (StringBuilder *dest, const char *src)