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/*
* Create a squashfs filesystem. This is a highly compressed read only
* filesystem.
*
* Copyright (c) 2023
* Phillip Lougher <phillip@squashfs.org.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* date.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <errno.h>
#include <limits.h>
#include "date.h"
#include "error.h"
int exec_date(char *string, unsigned int *mtime)
{
int res, pipefd[2], child, status;
int bytes = 0;
long long time;
char buffer[11];
res = pipe(pipefd);
if(res == -1) {
ERROR("Error executing date, pipe failed\n");
return FALSE;
}
child = fork();
if(child == -1) {
ERROR("Error executing date, fork failed\n");
goto failed;
}
if(child == 0) {
close(pipefd[0]);
close(STDOUT_FILENO);
res = dup(pipefd[1]);
if(res == -1)
exit(EXIT_FAILURE);
execl("/usr/bin/date", "date", "-d", string, "+%s", (char *) NULL);
exit(EXIT_FAILURE);
}
close(pipefd[1]);
while(1) {
res = read_bytes(pipefd[0], buffer, 11);
if(res == -1) {
ERROR("Error executing date\n");
goto failed2;
} else if(res == 0)
break;
bytes += res;
}
while(1) {
res = waitpid(child, &status, 0);
if(res != -1)
break;
else if(errno != EINTR) {
ERROR("Error executing data, waitpid failed\n");
goto failed2;
}
}
close(pipefd[0]);
if(!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
ERROR("Error executing date, failed to parse date string\n");
return FALSE;
}
if(bytes == 0 || bytes > 11) {
ERROR("Error executing date, unexpected result\n");
return FALSE;
}
/* replace trailing newline with string terminator */
buffer[bytes - 1] = '\0';
res = sscanf(buffer, "%lld", &time);
if(res < 1) {
ERROR("Error, unexpected result from date\n");
return FALSE;
}
if(time < 0) {
ERROR("Error, negative number returned from date, dates should be on or after the epoch of 1970-01-01 00:00 UTC\n");
return FALSE;
}
if(time > UINT_MAX) {
ERROR("Error, number returned from date >= 2^32, dates should be before 2106-02-07 06:28:16 UTC\n");
return FALSE;
}
*mtime = (unsigned int) time;
return TRUE;
failed:
close(pipefd[1]);
failed2:
close(pipefd[0]);
return FALSE;
}
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