Function luaL_checkoption

3rd/lua-5.4.3/src/lauxlib.c:360–370

*/

LUALIB_API int luaL_checkoption (lua_State *L, int arg, const char *def,
                                 const char *const lst[]) {
  const char *name = (def) ? luaL_optstring(L, arg, def) :
                             luaL_checkstring(L, arg);
  int i;
  for (i=0; lst[i]; i++)
    if (strcmp(lst[i], name) == 0)
      return i;
  return luaL_argerror(L, arg,
                       lua_pushfstring(L, "invalid option '%s'", name));
}


/*