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/*
* nixio - Linux I/O library for lua
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "nixio.h"
#define VERSION 0.1
/* pushes nil, error number and errstring on the stack */
int nixio__perror(lua_State *L) {
lua_pushnil(L);
lua_pushinteger(L, errno);
lua_pushstring(L, strerror(errno));
return 3;
}
/* pushes true, if operation succeeded, otherwise call nixio__perror */
int nixio__pstatus(lua_State *L, int condition) {
if (condition) {
lua_pushboolean(L, 1);
return 1;
} else {
return nixio__perror(L);
}
}
/* checks whether the first argument is a socket and returns it */
nixio_sock* nixio__checksock(lua_State *L) {
nixio_sock *sock = (nixio_sock*)luaL_checkudata(L, 1, NIXIO_META);
luaL_argcheck(L, sock->fd != -1, 1, "invalid socket object");
return sock;
}
/* read fd from nixio_sock object */
int nixio__checksockfd(lua_State *L) {
return nixio__checksock(L)->fd;
}
/* return any possible fd, otherwise error out */
int nixio__checkfd(lua_State *L, int ud) {
int fd = nixio__tofd(L, ud);
return (fd != -1) ? fd : luaL_argerror(L, ud, "invalid file descriptor");
}
/* return any possible fd */
int nixio__tofd(lua_State *L, int ud) {
void *udata = lua_touserdata(L, ud);
int fd = -1;
if (udata && lua_getmetatable(L, ud)) {
luaL_getmetatable(L, NIXIO_META);
luaL_getmetatable(L, LUA_FILEHANDLE);
if (lua_rawequal(L, -2, -3)) {
fd = ((nixio_sock*)udata)->fd;
} else if (lua_rawequal(L, -1, -3)) {
fd = fileno(*((FILE **)udata));
}
lua_pop(L, 3);
}
return fd;
}
/* object table */
static const luaL_reg R[] = {
{NULL, NULL}
};
/* entry point */
LUALIB_API int luaopen_nixio(lua_State *L) {
/* create metatable */
luaL_newmetatable(L, NIXIO_META);
/* method table */
lua_newtable(L);
lua_pushvalue(L, -1);
/* metatable.__index = M */
lua_setfield(L, -3, "__index");
lua_remove(L, -2);
/* register module */
luaL_register(L, "nixio", R);
/* register methods */
nixio_open_socket(L);
nixio_open_sockopt(L);
nixio_open_bind(L);
nixio_open_address(L);
nixio_open_poll(L);
/* module version */
lua_pushnumber(L, VERSION);
lua_setfield(L, -2, "version");
/* remove meta table */
lua_remove(L, -2);
return 1;
}
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