Function lua_tolstring

src/Chain/libraries/glua/lapi.cpp:376–392

LUA_API const char *lua_tolstring(lua_State *L, int idx, size_t *len) {
    StkId o = index2addr(L, idx);
    if (!ttisstring(o)) {
        if (!cvt2str(o)) {  /* not convertible? */
            if (len != nullptr) *len = 0;
            return nullptr;
        }
        lua_lock(L);  /* 'luaO_tostring' may create a new string */
        luaC_checkGC(L);
        o = index2addr(L, idx);  /* previous call may reallocate the stack */
        luaO_tostring(L, o);
        lua_unlock(L);
    }
    if (len != nullptr)
        *len = vslen(o);
    return svalue(o);
}


LUA_API size_t lua_rawlen(lua_State *L, int idx) {