Function luaL_len

third-party/lua-5.2.4/src/lauxlib.c:725–734

LUALIB_API int luaL_len (lua_State *L, int idx) {
  int l;
  int isnum;
  lua_len(L, idx);
  l = (int)lua_tointegerx(L, -1, &isnum);
  if (!isnum)
    luaL_error(L, "object length is not a number");
  lua_pop(L, 1);  /* remove object */
  return l;
}


LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {