Editor
/* $Id$ */
/* Copyright (c) 2014-2017 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS Desktop Editor */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <locale.h>
#include <errno.h>
#include <libintl.h>
#include <System.h>
#include "../src/filter.h"
#include "../config.h"
#define _(string) gettext(string)
/* constants */
#ifndef PROGNAME_FILTER
# define PROGNAME_FILTER "filter"
#endif
#ifndef PREFIX
# define PREFIX "/usr/local"
#endif
#ifndef DATADIR
# define DATADIR PREFIX "/share"
#endif
#ifndef LOCALEDIR
# define LOCALEDIR DATADIR "/locale"
#endif
/* filter */
/* private */
/* prototypes */
static int _filter(int argc, char const * argv[]);
static int _error(char const * message, int ret);
static int _usage(void);
/* functions */
/* filter */
static int _filter_exec(char const * template, int argc, char const ** argv);
static int _filter_exec_child(char const * template, int argc,
char const ** argv);
static int _filter(int argc, char const * argv[])
{
int ret = 0;
char template[] = "/tmp/" PROGNAME_FILTER ".XXXXXX";
int fd;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
/* obtain a temporary file */
if((fd = mkstemp(template)) < 0)
return -_error("mkstemp", 1);
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s() \"%s\"\n", __func__, template);
#endif
/* write to and from the temporary file */
if((ret = filter_read(fd, template)) != 0
|| (ret = _filter_exec(template, argc, argv)) != 0
|| (ret = filter_write(template)) != 0)
error_print(PROGNAME_FILTER);
/* remove the temporary file */
if(unlink(template) != 0)
/* we can otherwise ignore this error */
_error(template, 1);
return ret;
}
static int _filter_exec(char const * template, int argc, char const ** argv)
{
int ret = 0;
pid_t pid;
int status;
pid_t p;
if((pid = fork()) == -1)
return -error_set_code(1, "%s: %s", "fork", strerror(errno));
if(pid == 0)
{
if(_filter_exec_child(template, argc, argv) != 0)
error_print(PROGNAME_FILTER);
_exit(2);
}
fclose(stdin);
for(; (p = waitpid(pid, &status, 0)) != -1 || errno != ECHILD;)
if(p == pid && WIFEXITED(status))
{
if(WEXITSTATUS(status) != 0)
ret = -error_set_code(1, "%s: %s%u", argv[0],
_("Exited with error code "),
WEXITSTATUS(status));
break;
}
else if(p == pid && WIFSIGNALED(status))
break;
return ret;
}
static int _filter_exec_child(char const * template, int argc,
char const ** argv)
{
int ret = 0;
char ** args;
int i;
/* prepare the arguments */
if((args = malloc(sizeof(*args) * (argc + 2))) == NULL)
return -_error("malloc", 1);
for(i = 0; i < argc; i++)
args[i] = strdup(argv[i]);
args[i] = strdup(template);
args[i + 1] = NULL;
/* check for errors */
for(i = 0; ret == 0 && i <= argc; i++)
if(args[i] == NULL)
ret = -_error("strdup", 1);
if(ret == 0 && execvp(args[0], args) != 0)
ret = -_error(args[0], 1);
/* free the arguments (an error occurred) */
for(i = 0; i <= argc; i++)
free(args[i]);
free(args);
return ret;
}
/* error */
static int _error(char const * message, int ret)
{
fputs(PROGNAME_FILTER ": ", stderr);
perror(message);
return ret;
}
/* usage */
static int _usage(void)
{
fprintf(stderr, _("Usage: %s command [argument...]\n"),
PROGNAME_FILTER);
return 1;
}
/* main */
int main(int argc, char * argv[])
{
int o;
if(setlocale(LC_ALL, "") == NULL)
_error("setlocale", 1);
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
while((o = getopt(argc, argv, "")) != -1)
switch(o)
{
default:
return _usage();
}
if(argc - optind == 0)
return _usage();
return (_filter(argc - optind, (const char **)&argv[optind]) == 0)
? 0 : 2;
}