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);
126 int *udata = lua_newuserdata(L, sizeof(int));
128 return luaL_error(L, "out of memory");
132 luaL_getmetatable(L, NIXIO_FILE_META);
133 lua_setmetatable(L, -2);
138 static int nixio_pipe(lua_State *L) {
139 int pipefd[2], *udata;
141 return nixio__perror(L);
144 luaL_getmetatable(L, NIXIO_FILE_META);
145 udata = lua_newuserdata(L, sizeof(int));
147 return luaL_error(L, "out of memory");
151 lua_pushvalue(L, -2);
152 lua_setmetatable(L, -2);
155 udata = lua_newuserdata(L, sizeof(int));
157 return luaL_error(L, "out of memory");
161 lua_pushvalue(L, -3);
162 lua_setmetatable(L, -2);
167 static int nixio_file_write(lua_State *L) {
168 int fd = nixio__checkfd(L, 1);
171 const char *data = luaL_checklstring(L, 2, &len);
173 if (lua_gettop(L) > 2) {
174 int offset = luaL_optint(L, 3, 0);
184 unsigned int wlen = luaL_optint(L, 4, len);
191 sent = write(fd, data, len);
192 } while(sent == -1 && errno == EINTR);
194 lua_pushinteger(L, sent);
197 return nixio__perror(L);
201 static int nixio_file_read(lua_State *L) {
202 int fd = nixio__checkfd(L, 1);
203 char buffer[NIXIO_BUFFERSIZE];
204 uint req = luaL_checkinteger(L, 2);
207 /* We limit the readsize to NIXIO_BUFFERSIZE */
208 req = (req > NIXIO_BUFFERSIZE) ? NIXIO_BUFFERSIZE : req;
211 readc = read(fd, buffer, req);
212 } while (readc == -1 && errno == EINTR);
215 return nixio__perror(L);
217 lua_pushlstring(L, buffer, readc);
223 static int nixio_file_seek(lua_State *L) {
224 int fd = nixio__checkfd(L, 1);
225 off_t len = (off_t)luaL_checknumber(L, 2);
227 const char *whstr = luaL_optlstring(L, 3, "set", NULL);
228 if (!strcmp(whstr, "set")) {
230 } else if (!strcmp(whstr, "cur")) {
232 } else if (!strcmp(whstr, "end")) {
235 return luaL_argerror(L, 3, "supported values: set, cur, end");
237 len = lseek(fd, len, whence);
239 return nixio__perror(L);
241 lua_pushnumber(L, len);
246 static int nixio_file_tell(lua_State *L) {
247 int fd = nixio__checkfd(L, 1);
248 off_t pos = lseek(fd, 0, SEEK_CUR);
250 return nixio__perror(L);
252 lua_pushnumber(L, pos);
257 static int nixio_file_stat(lua_State *L) {
259 if (fstat(nixio__checkfd(L, 1), &buf)) {
260 return nixio__perror(L);
262 nixio__push_stat(L, &buf);
263 if (lua_isstring(L, 2)) {
264 lua_getfield(L, -1, lua_tostring(L, 2));
270 static int nixio_file_sync(lua_State *L) {
271 int fd = nixio__checkfd(L, 1);
273 #if (!defined BSD && !defined __WINNT__)
274 int dataonly = lua_toboolean(L, 2);
276 stat = (dataonly) ? fdatasync(fd) : fsync(fd);
277 } while (stat == -1 && errno == EINTR);
278 return nixio__pstatus(L, !stat);
282 } while (stat == -1 && errno == EINTR);
283 return nixio__pstatus(L, !stat);
287 static int nixio_file_lock(lua_State *L) {
288 int fd = nixio__checkfd(L, 1);
289 const char *flag = luaL_checkstring(L, 2);
290 off_t len = (off_t)luaL_optnumber(L, 3, 0);
294 if (!strcmp(flag, "lock")) {
296 } else if (!strcmp(flag, "tlock")) {
298 } else if (!strcmp(flag, "ulock")) {
300 } else if (!strcmp(flag, "test")) {
303 return luaL_argerror(L, 2,
304 "supported values: lock, tlock, ulock, test");
308 stat = lockf(fd, cmd, len);
309 } while (stat == -1 && errno == EINTR);
311 return nixio__pstatus(L, !stat);
314 static int nixio_file_close(lua_State *L) {
315 int *fdp = luaL_checkudata(L, 1, NIXIO_FILE_META);
316 luaL_argcheck(L, *fdp != -1, 1, "invalid file object");
320 } while (res == -1 && errno == EINTR);
322 return nixio__pstatus(L, !res);
325 static int nixio_file__gc(lua_State *L) {
326 int *fdp = luaL_checkudata(L, 1, NIXIO_FILE_META);
331 } while (res == -1 && errno == EINTR);
338 * string representation
340 static int nixio_file__tostring(lua_State *L) {
341 lua_pushfstring(L, "nixio file %d", nixio__tofd(L, 1));
346 static const luaL_reg M[] = {
347 {"write", nixio_file_write},
348 {"read", nixio_file_read},
349 {"tell", nixio_file_tell},
350 {"seek", nixio_file_seek},
351 {"stat", nixio_file_stat},
352 {"sync", nixio_file_sync},
353 {"lock", nixio_file_lock},
354 {"close", nixio_file_close},
355 {"__gc", nixio_file__gc},
356 {"__tostring", nixio_file__tostring},
361 static const luaL_reg R[] = {
363 {"open", nixio_open},
364 {"open_flags", nixio_open_flags},
365 {"pipe", nixio_pipe},
369 void nixio_open_file(lua_State *L) {
370 luaL_register(L, NULL, R);
372 luaL_newmetatable(L, NIXIO_FILE_META);
373 luaL_register(L, NULL, M);
374 lua_pushvalue(L, -1);
375 lua_setfield(L, -2, "__index");
377 int *uin = lua_newuserdata(L, sizeof(int));
378 int *uout = lua_newuserdata(L, sizeof(int));
379 int *uerr = lua_newuserdata(L, sizeof(int));
381 if (!uin || !uout || !uerr) {
382 luaL_error(L, "out of memory");
386 *uout = STDOUT_FILENO;
387 *uerr = STDERR_FILENO;
389 for (int i = -4; i < -1; i++) {
390 lua_pushvalue(L, -4);
391 lua_setmetatable(L, i);
394 lua_setfield(L, -5, "stderr");
395 lua_setfield(L, -4, "stdout");
396 lua_setfield(L, -3, "stdin");
397 lua_setfield(L, -2, "meta_file");