LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
const luaL_Reg *l, int nup) {
if (libname) {
int size = libsize(l);
/* check whether lib already exists */
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", size);
lua_getfield(L, -1, libname); /* get _LOADED[libname] */
if (!lua_istable(L, -1)) { /* not found? */
lua_pop(L, 1); /* remove previous result */
/* try global variable (and create one if it does not exist) */
if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
luaL_error(L, "name conflict for module " LUA_QS, libname);
lua_pushvalue(L, -1);
lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
}
lua_remove(L, -2); /* remove _LOADED table */
lua_insert(L, -(nup+1)); /* move library table to below upvalues */
}
for (; l->name; l++) {
int i;
for (i=0; i<nup; i++) /* copy upvalues to the top */
lua_pushvalue(L, -nup);
lua_pushcclosure(L, l->func, nup);
lua_setfield(L, -(nup+2), l->name);
}
lua_pop(L, nup); /* remove upvalues */
}
void luaL_openlib (lua_State *L, const char *libname, const luaL_Reg *l, int nup) {
luaL_checkversion(L);
if (libname) {
luaL_pushmodule(L, libname, libsize(l)); /* get/create library table */
lua_insert(L, -(nup + 1)); /* move library table to below upvalues */
}
if (l)
luaL_setfuncs(L, l, nup);
else
lua_pop(L, nup); /* remove upvalues */
}
static void preload_modules(lua_State *lua)
{
const luaL_Reg *lib = preload_module_list;
luaL_findtable(lua, LUA_REGISTRYINDEX, "_PRELOADED",
libsize(preload_module_list));
for (; lib->func; lib++) {
lua_pushstring(lua, lib->name);
lua_pushcfunction(lua, lib->func);
lua_rawset(lua, -3);
}
lua_pop(lua, 1); // remove the preloaded table
}
