Function luaL_pushmodule

ThirdParty/lua/lua/lauxlib.c:826–839

** Find or create a module table with a given name. The function ** first looks at the _LOADED table and, if that fails, try a ** global variable with that name. In any case, leaves on the stack ** the module table. */

** the module table.
*/
LUALIB_API void luaL_pushmodule (lua_State *L, const char *modname,
                                 int sizehint) {
  luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);  /* get _LOADED table */
  if (lua_getfield(L, -1, modname) != LUA_TTABLE) {  /* no _LOADED[modname]? */
    lua_pop(L, 1);  /* remove previous result */
    /* try global variable (and create one if it does not exist) */
    lua_pushglobaltable(L);
    if (luaL_findtable(L, 0, modname, sizehint) != NULL)
      luaL_error(L, "name conflict for module '%s'", modname);
    lua_pushvalue(L, -1);
    lua_setfield(L, -3, modname);  /* _LOADED[modname] = new table */
  }
  lua_remove(L, -2);  /* remove _LOADED table */
}


LUALIB_API void luaL_openlib (lua_State *L, const char *libname,