Function findloader

src/Chain/libraries/glua/loadlib.cpp:587–612

static void findloader(lua_State *L, const char *name) {
    int i;
    luaL_Buffer msg;  /* to build error message */
    luaL_buffinit(L, &msg);
    /* push 'package.searchers' to index 3 in the stack */
    if (lua_getfield(L, lua_upvalueindex(1), "searchers") != LUA_TTABLE)
        luaL_error(L, "'package.searchers' must be a table");
    /*  iterate over available searchers to find a loader */
    for (i = 1;; i++) {
        if (lua_rawgeti(L, 3, i) == LUA_TNIL) {  /* no more searchers? */
            lua_pop(L, 1);  /* remove nil */
            luaL_pushresult(&msg);  /* create error message */
            luaL_error(L, "module '%s' not found:%s", name, lua_tostring(L, -1));
        }
        lua_pushstring(L, name);
        lua_call(L, 1, 2);  /* call it */
        if (lua_isfunction(L, -2))  /* did it find a loader? */
            return;  /* module loader found */
        else if (lua_isstring(L, -2)) {  /* searcher returned error message? */
            lua_pop(L, 1);  /* remove extra return */
            luaL_addvalue(&msg);  /* concatenate error message */
        }
        else
            lua_pop(L, 2);  /* remove both returns */
    }
}

static void findloader_for_import_contract(lua_State *L, const char *name)
{