luaL_optlstring 52 lib/lua/lauxlib.h LUALIB_API const char *(luaL_optlstring) (lua_State *L, int numArg, luaL_optlstring 103 lib/lua/lauxlib.h #define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL)) luaL_optlstring 148 lib/lua/ltablib.c const char *sep = luaL_optlstring(L, 2, "", &lsep);