Function newbuffsize

third-party/lua-5.5.0/src/lauxlib.c:546–556

** Compute new size for buffer 'B', enough to accommodate extra 'sz' ** bytes plus one for a terminating zero. */

** bytes plus one for a terminating zero.
*/
static size_t newbuffsize (luaL_Buffer *B, size_t sz) {
  size_t newsize = B->size;
  if (l_unlikely(sz >= MAX_SIZE - B->n))
    return cast_sizet(luaL_error(B->L, "resulting string too large"));
  /* else  B->n + sz + 1 <= MAX_SIZE */
  if (newsize <= MAX_SIZE/3 * 2)  /* no overflow? */
    newsize += (newsize >> 1);  /* new size *= 1.5 */
  if (newsize < B->n + sz + 1)  /* not big enough? */
    newsize = B->n + sz + 1;
  return newsize;
}


/*