Function copywithendian

lib/lua/src/lstrlib.c:1589–1598

** Copy 'size' bytes from 'src' to 'dest', correcting endianness if ** given 'islittle' is different from native endianness. */

** given 'islittle' is different from native endianness.
*/
static void copywithendian (char *dest, const char *src,
                            int size, int islittle) {
  if (islittle == nativeendian.little)
    memcpy(dest, src, size);
  else {
    dest += size - 1;
    while (size-- != 0)
      *(dest--) = *(src++);
  }
}


static int str_pack (lua_State *L) {