2 * nixio - Linux I/O library for lua
4 * Copyright (C) 2009 Steven Barth <steven@midlink.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
26 #include <sys/types.h>
28 #include <sys/param.h>
31 static int nixio_open(lua_State *L) {
32 const char *filename = luaL_checklstring(L, 1, NULL);
35 if (lua_isnoneornil(L, 2)) {
37 } else if (lua_isnumber(L, 2)) {
38 flags = lua_tointeger(L, 2);
39 } else if (lua_isstring(L, 2)) {
40 const char *str = lua_tostring(L, 2);
41 if (!strcmp(str, "r")) {
43 } else if (!strcmp(str, "r+")) {
45 } else if (!strcmp(str, "w")) {
46 flags = O_WRONLY | O_CREAT | O_TRUNC;
47 } else if (!strcmp(str, "w+")) {
48 flags = O_RDWR | O_CREAT | O_TRUNC;
49 } else if (!strcmp(str, "a")) {
50 flags = O_WRONLY | O_CREAT | O_APPEND;
51 } else if (!strcmp(str, "a+")) {
52 flags = O_RDWR | O_CREAT | O_APPEND;
54 return luaL_argerror(L, 2, "supported values: r, r+, w, w+, a, a+");
57 return luaL_argerror(L, 2, "open flags or string expected");
63 fd = open(filename, flags, nixio__check_mode(L, 3, 0666));
64 } while (fd == -1 && errno == EINTR);
66 return nixio__perror(L);
69 int *udata = lua_newuserdata(L, sizeof(int));
71 return luaL_error(L, "out of memory");
76 luaL_getmetatable(L, NIXIO_FILE_META);
77 lua_setmetatable(L, -2);
82 static int nixio_open_flags(lua_State *L) {
84 const int j = lua_gettop(L);
85 for (int i=1; i<=j; i++) {
86 const char *flag = luaL_checkstring(L, i);
87 if (!strcmp(flag, "append")) {
89 } else if (!strcmp(flag, "creat")) {
91 } else if (!strcmp(flag, "excl")) {
93 } else if (!strcmp(flag, "nonblock") || !strcmp(flag, "ndelay")) {
97 } else if (!strcmp(flag, "sync")) {
101 } else if (!strcmp(flag, "trunc")) {
103 } else if (!strcmp(flag, "rdonly")) {
105 } else if (!strcmp(flag, "wronly")) {
107 } else if (!strcmp(flag, "rdwr")) {
110 return luaL_argerror(L, i, "supported values: append, creat, "
111 "excl, nonblock, ndelay, sync, trunc");
114 lua_pushinteger(L, mode);
118 static int nixio_dup(lua_State *L) {
119 int oldfd = nixio__checkfd(L, 1);
120 int newfd = (lua_gettop(L) > 1) ? nixio__checkfd(L, 2) : -1;
121 int stat = (newfd == -1) ? dup(oldfd) : dup2(oldfd, newfd);
124 return nixio__perror(L);
127 int *udata = lua_newuserdata(L, sizeof(int));
129 return luaL_error(L, "out of memory");
133 luaL_getmetatable(L, NIXIO_FILE_META);
134 lua_setmetatable(L, -2);
142 static int nixio_pipe(lua_State *L) {
143 int pipefd[2], *udata;
145 return nixio__perror(L);
148 luaL_getmetatable(L, NIXIO_FILE_META);
149 udata = lua_newuserdata(L, sizeof(int));
151 return luaL_error(L, "out of memory");
155 lua_pushvalue(L, -2);
156 lua_setmetatable(L, -2);
159 udata = lua_newuserdata(L, sizeof(int));
161 return luaL_error(L, "out of memory");
165 lua_pushvalue(L, -3);
166 lua_setmetatable(L, -2);
171 static int nixio_file_write(lua_State *L) {
172 int fd = nixio__checkfd(L, 1);
175 const char *data = luaL_checklstring(L, 2, &len);
177 if (lua_gettop(L) > 2) {
178 int offset = luaL_optint(L, 3, 0);
188 unsigned int wlen = luaL_optint(L, 4, len);
195 sent = write(fd, data, len);
196 } while(sent == -1 && errno == EINTR);
198 lua_pushinteger(L, sent);
201 return nixio__perror(L);
205 static int nixio_file_read(lua_State *L) {
206 int fd = nixio__checkfd(L, 1);
207 char buffer[NIXIO_BUFFERSIZE];
208 uint req = luaL_checkinteger(L, 2);
211 /* We limit the readsize to NIXIO_BUFFERSIZE */
212 req = (req > NIXIO_BUFFERSIZE) ? NIXIO_BUFFERSIZE : req;
215 readc = read(fd, buffer, req);
216 } while (readc == -1 && errno == EINTR);
219 return nixio__perror(L);
221 lua_pushlstring(L, buffer, readc);
227 static int nixio_file_seek(lua_State *L) {
228 int fd = nixio__checkfd(L, 1);
229 off_t len = (off_t)nixio__checknumber(L, 2);
231 const char *whstr = luaL_optlstring(L, 3, "set", NULL);
232 if (!strcmp(whstr, "set")) {
234 } else if (!strcmp(whstr, "cur")) {
236 } else if (!strcmp(whstr, "end")) {
239 return luaL_argerror(L, 3, "supported values: set, cur, end");
241 len = lseek(fd, len, whence);
243 return nixio__perror(L);
245 nixio__pushnumber(L, len);
250 static int nixio_file_tell(lua_State *L) {
251 int fd = nixio__checkfd(L, 1);
252 off_t pos = lseek(fd, 0, SEEK_CUR);
254 return nixio__perror(L);
256 nixio__pushnumber(L, pos);
261 static int nixio_file_stat(lua_State *L) {
263 if (fstat(nixio__checkfd(L, 1), &buf)) {
264 return nixio__perror(L);
266 nixio__push_stat(L, &buf);
267 if (lua_isstring(L, 2)) {
268 lua_getfield(L, -1, lua_tostring(L, 2));
274 static int nixio_file_sync(lua_State *L) {
275 int fd = nixio__checkfd(L, 1);
277 #if (!defined BSD && !defined __WINNT__)
278 int dataonly = lua_toboolean(L, 2);
280 stat = (dataonly) ? fdatasync(fd) : fsync(fd);
281 } while (stat == -1 && errno == EINTR);
282 return nixio__pstatus(L, !stat);
286 } while (stat == -1 && errno == EINTR);
287 return nixio__pstatus(L, !stat);
291 static int nixio_file_lock(lua_State *L) {
292 int fd = nixio__checkfd(L, 1);
293 const char *flag = luaL_checkstring(L, 2);
294 off_t len = (off_t)nixio__optnumber(L, 3, 0);
298 if (!strcmp(flag, "lock")) {
300 } else if (!strcmp(flag, "tlock")) {
302 } else if (!strcmp(flag, "ulock")) {
304 } else if (!strcmp(flag, "test")) {
307 return luaL_argerror(L, 2,
308 "supported values: lock, tlock, ulock, test");
312 stat = lockf(fd, cmd, len);
313 } while (stat == -1 && errno == EINTR);
315 return nixio__pstatus(L, !stat);
318 static int nixio_file_close(lua_State *L) {
319 int *fdp = luaL_checkudata(L, 1, NIXIO_FILE_META);
320 luaL_argcheck(L, *fdp != -1, 1, "invalid file object");
324 } while (res == -1 && errno == EINTR);
326 return nixio__pstatus(L, !res);
329 static int nixio_file__gc(lua_State *L) {
330 int *fdp = luaL_checkudata(L, 1, NIXIO_FILE_META);
335 } while (res == -1 && errno == EINTR);
342 * string representation
344 static int nixio_file__tostring(lua_State *L) {
345 lua_pushfstring(L, "nixio file %d", nixio__tofd(L, 1));
350 static const luaL_reg M[] = {
351 {"write", nixio_file_write},
352 {"read", nixio_file_read},
353 {"tell", nixio_file_tell},
354 {"seek", nixio_file_seek},
355 {"stat", nixio_file_stat},
356 {"sync", nixio_file_sync},
357 {"lock", nixio_file_lock},
358 {"close", nixio_file_close},
359 {"__gc", nixio_file__gc},
360 {"__tostring", nixio_file__tostring},
365 static const luaL_reg R[] = {
367 {"open", nixio_open},
368 {"open_flags", nixio_open_flags},
369 {"pipe", nixio_pipe},
373 void nixio_open_file(lua_State *L) {
374 luaL_register(L, NULL, R);
376 luaL_newmetatable(L, NIXIO_FILE_META);
377 luaL_register(L, NULL, M);
378 lua_pushvalue(L, -1);
379 lua_setfield(L, -2, "__index");
381 int *uin = lua_newuserdata(L, sizeof(int));
382 int *uout = lua_newuserdata(L, sizeof(int));
383 int *uerr = lua_newuserdata(L, sizeof(int));
385 if (!uin || !uout || !uerr) {
386 luaL_error(L, "out of memory");
390 *uout = STDOUT_FILENO;
391 *uerr = STDERR_FILENO;
393 for (int i = -4; i < -1; i++) {
394 lua_pushvalue(L, -4);
395 lua_setmetatable(L, i);
398 lua_setfield(L, -5, "stderr");
399 lua_setfield(L, -4, "stdout");
400 lua_setfield(L, -3, "stdin");
401 lua_setfield(L, -2, "meta_file");