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.
28 static int nixio_file(lua_State *L) {
29 const char *filename = luaL_checklstring(L, 1, NULL);
30 const char *mode = luaL_optlstring(L, 2, "r", NULL);
32 FILE *file = fopen(filename, mode);
34 return nixio__perror(L);
37 FILE **udata = lua_newuserdata(L, sizeof(FILE*));
39 return luaL_error(L, "out of memory");
44 luaL_getmetatable(L, NIXIO_FILE_META);
45 lua_setmetatable(L, -2);
50 static int nixio_pipe(lua_State *L) {
54 return nixio__perror(L);
57 luaL_getmetatable(L, NIXIO_FILE_META);
58 udata = lua_newuserdata(L, sizeof(FILE*));
60 return luaL_error(L, "out of memory");
63 if (!(*udata = fdopen(pipefd[0], "r"))) {
64 return nixio__perror(L);
67 lua_setmetatable(L, -2);
70 udata = lua_newuserdata(L, sizeof(FILE**));
71 if (!(*udata = fdopen(pipefd[1], "w"))) {
72 return nixio__perror(L);
75 lua_setmetatable(L, -2);
80 static int nixio_file_write(lua_State *L) {
81 int fd = nixio__checkfd(L, 1);
84 const char *data = luaL_checklstring(L, 2, &len);
87 sent = write(fd, data, len);
88 } while(sent == -1 && errno == EINTR);
90 lua_pushinteger(L, sent);
93 return nixio__perror(L);
97 static int nixio_file_read(lua_State *L) {
98 int fd = nixio__checkfd(L, 1);
99 char buffer[NIXIO_BUFFERSIZE];
100 int req = luaL_checkinteger(L, 2);
103 /* We limit the readsize to NIXIO_BUFFERSIZE */
104 req = (req > NIXIO_BUFFERSIZE) ? NIXIO_BUFFERSIZE : req;
107 readc = read(fd, buffer, req);
108 } while (readc == -1 && errno == EINTR);
111 return nixio__perror(L);
113 lua_pushlstring(L, buffer, readc);
119 static int nixio_file_seek(lua_State *L) {
120 FILE *f = nixio__checkfile(L);
121 off_t len = (off_t)luaL_checknumber(L, 2);
123 const char *whstr = luaL_optlstring(L, 3, "set", NULL);
124 if (!strcmp(whstr, "set")) {
126 } else if (!strcmp(whstr, "cur")) {
128 } else if (!strcmp(whstr, "end")) {
131 return luaL_argerror(L, 3, "supported values: set, cur, end");
133 return nixio__pstatus(L, !fseeko(f, len, whence));
136 static int nixio_file_tell(lua_State *L) {
137 FILE *f = nixio__checkfile(L);
138 off_t pos = ftello(f);
140 return nixio__perror(L);
142 lua_pushnumber(L, (lua_Number)pos);
147 static int nixio_file_flush(lua_State *L) {
148 FILE *f = nixio__checkfile(L);
149 return nixio__pstatus(L, !fflush(f));
152 static int nixio_file_lock(lua_State *L) {
153 int fd = fileno(nixio__checkfile(L));
155 const int j = lua_gettop(L);
157 for (int i=2; i<=j; i++) {
158 const char *flag = luaL_checkstring(L, i);
159 if (!strcmp(flag, "sh")) {
161 } else if (!strcmp(flag, "ex")) {
163 } else if (!strcmp(flag, "un")) {
165 } else if (!strcmp(flag, "nb")) {
168 return luaL_argerror(L, i, "supported values: sh, ex, un, nb");
172 return nixio__pstatus(L, !flock(fd, flags));
175 static int nixio_file_close(lua_State *L) {
176 FILE **fpp = (FILE**)luaL_checkudata(L, 1, NIXIO_FILE_META);
177 luaL_argcheck(L, *fpp, 1, "invalid file object");
178 int res = fclose(*fpp);
180 return nixio__pstatus(L, !res);
183 static int nixio_file__gc(lua_State *L) {
184 FILE **fpp = (FILE**)luaL_checkudata(L, 1, NIXIO_FILE_META);
193 * string representation
195 static int nixio_file__tostring(lua_State *L) {
196 lua_pushfstring(L, "nixio file %d", nixio__tofd(L, 1));
201 static const luaL_reg M[] = {
202 {"write", nixio_file_write},
203 {"read", nixio_file_read},
204 {"tell", nixio_file_tell},
205 {"seek", nixio_file_seek},
206 {"flush", nixio_file_flush},
207 {"lock", nixio_file_lock},
208 {"close", nixio_file_close},
209 {"__gc", nixio_file__gc},
210 {"__tostring", nixio_file__tostring},
215 static const luaL_reg R[] = {
216 {"open", nixio_file},
217 {"pipe", nixio_pipe},
221 void nixio_open_file(lua_State *L) {
222 luaL_register(L, NULL, R);
224 luaL_newmetatable(L, NIXIO_FILE_META);
225 luaL_register(L, NULL, M);
226 lua_pushvalue(L, -1);
227 lua_setfield(L, -2, "__index");
228 lua_setfield(L, -2, "meta_file");