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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 "nixio.h"
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/file.h>
static int nixio_file(lua_State *L) {
const char *filename = luaL_checklstring(L, 1, NULL);
const char *mode = luaL_optlstring(L, 2, "r", NULL);
FILE *file = fopen(filename, mode);
if (!file) {
return nixio__perror(L);
}
FILE **udata = lua_newuserdata(L, sizeof(FILE*));
if (!udata) {
return luaL_error(L, "out of memory");
}
*udata = file;
luaL_getmetatable(L, NIXIO_FILE_META);
lua_setmetatable(L, -2);
return 1;
}
static int nixio_pipe(lua_State *L) {
int pipefd[2];
FILE **udata;
if (pipe(pipefd)) {
return nixio__perror(L);
}
luaL_getmetatable(L, NIXIO_FILE_META);
udata = lua_newuserdata(L, sizeof(FILE*));
if (!udata) {
return luaL_error(L, "out of memory");
}
if (!(*udata = fdopen(pipefd[0], "r"))) {
return nixio__perror(L);
}
lua_pushvalue(L, -2);
lua_setmetatable(L, -2);
udata = lua_newuserdata(L, sizeof(FILE**));
if (!(*udata = fdopen(pipefd[1], "w"))) {
return nixio__perror(L);
}
lua_pushvalue(L, -3);
lua_setmetatable(L, -2);
return 2;
}
static int nixio_file_write(lua_State *L) {
int fd = nixio__checkfd(L, 1);
size_t len;
ssize_t sent;
const char *data = luaL_checklstring(L, 2, &len);
do {
sent = write(fd, data, len);
} while(sent == -1 && errno == EINTR);
if (sent >= 0) {
lua_pushinteger(L, sent);
return 1;
} else {
return nixio__perror(L);
}
}
static int nixio_file_read(lua_State *L) {
int fd = nixio__checkfd(L, 1);
char buffer[NIXIO_BUFFERSIZE];
int req = luaL_checkinteger(L, 2);
int readc;
/* We limit the readsize to NIXIO_BUFFERSIZE */
req = (req > NIXIO_BUFFERSIZE) ? NIXIO_BUFFERSIZE : req;
do {
readc = read(fd, buffer, req);
} while (readc == -1 && errno == EINTR);
if (readc < 0) {
return nixio__perror(L);
} else {
lua_pushlstring(L, buffer, readc);
return 1;
}
}
static int nixio_file_seek(lua_State *L) {
FILE *f = nixio__checkfile(L);
off_t len = (off_t)luaL_checknumber(L, 2);
int whence;
const char *whstr = luaL_optlstring(L, 3, "set", NULL);
if (!strcmp(whstr, "set")) {
whence = SEEK_SET;
} else if (!strcmp(whstr, "cur")) {
whence = SEEK_CUR;
} else if (!strcmp(whstr, "end")) {
whence = SEEK_END;
} else {
return luaL_argerror(L, 3, "supported values: set, cur, end");
}
return nixio__pstatus(L, !fseeko(f, len, whence));
}
static int nixio_file_tell(lua_State *L) {
FILE *f = nixio__checkfile(L);
off_t pos = ftello(f);
if (pos < 0) {
return nixio__perror(L);
} else {
lua_pushnumber(L, (lua_Number)pos);
return 1;
}
}
static int nixio_file_flush(lua_State *L) {
FILE *f = nixio__checkfile(L);
return nixio__pstatus(L, !fflush(f));
}
static int nixio_file_lock(lua_State *L) {
int fd = fileno(nixio__checkfile(L));
const int j = lua_gettop(L);
int flags = 0;
for (int i=2; i<=j; i++) {
const char *flag = luaL_checkstring(L, i);
if (!strcmp(flag, "sh")) {
flags |= LOCK_SH;
} else if (!strcmp(flag, "ex")) {
flags |= LOCK_EX;
} else if (!strcmp(flag, "un")) {
flags |= LOCK_UN;
} else if (!strcmp(flag, "nb")) {
flags |= LOCK_NB;
} else {
return luaL_argerror(L, i, "supported values: sh, ex, un, nb");
}
}
return nixio__pstatus(L, !flock(fd, flags));
}
static int nixio_file_close(lua_State *L) {
FILE **fpp = (FILE**)luaL_checkudata(L, 1, NIXIO_FILE_META);
luaL_argcheck(L, *fpp, 1, "invalid file object");
int res = fclose(*fpp);
*fpp = NULL;
return nixio__pstatus(L, !res);
}
static int nixio_file__gc(lua_State *L) {
FILE **fpp = (FILE**)luaL_checkudata(L, 1, NIXIO_FILE_META);
if (*fpp) {
fclose(*fpp);
*fpp = NULL;
}
return 0;
}
/**
* string representation
*/
static int nixio_file__tostring(lua_State *L) {
lua_pushfstring(L, "nixio file %d", nixio__tofd(L, 1));
return 1;
}
/* method table */
static const luaL_reg M[] = {
{"write", nixio_file_write},
{"read", nixio_file_read},
{"tell", nixio_file_tell},
{"seek", nixio_file_seek},
{"flush", nixio_file_flush},
{"lock", nixio_file_lock},
{"close", nixio_file_close},
{"__gc", nixio_file__gc},
{"__tostring", nixio_file__tostring},
{NULL, NULL}
};
/* module table */
static const luaL_reg R[] = {
{"open", nixio_file},
{"pipe", nixio_pipe},
{NULL, NULL}
};
void nixio_open_file(lua_State *L) {
luaL_register(L, NULL, R);
luaL_newmetatable(L, NIXIO_FILE_META);
luaL_register(L, NULL, M);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_setfield(L, -2, "meta_file");
}
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