86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/* $Id$ */
|
|
/* Copyright (c) 2014 Pierre Pronchery <khorben@defora.org> */
|
|
/* This file is part of DeforaOS Unix utils */
|
|
/* 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, version 3 of the License.
|
|
*
|
|
* 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
|
|
|
|
/* date */
|
|
/* private */
|
|
/* prototypes */
|
|
static int _date(char const * format);
|
|
static int _date_error(char const * message, int ret);
|
|
static int _usage(void);
|
|
|
|
|
|
/* functions */
|
|
/* date */
|
|
static int _date(char const * format)
|
|
{
|
|
time_t t;
|
|
struct tm tm;
|
|
char buf[128];
|
|
|
|
tzset();
|
|
if((t = time(NULL)) == -1)
|
|
return -_date_error("time", 1);
|
|
if(localtime_r(&t, &tm) == NULL)
|
|
return -_date_error("localtime_r", 1);
|
|
if(strftime(buf, sizeof(buf), format, &tm) == 0 && format[0] != '\0')
|
|
return -_date_error("strftime", 1);
|
|
puts(buf);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* error */
|
|
static int _date_error(char const * message, int ret)
|
|
{
|
|
fputs("date: ", stderr);
|
|
perror(message);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* usage */
|
|
static int _usage(void)
|
|
{
|
|
fputs("Usage: date [+format]\n", stderr);
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* main */
|
|
int main(int argc, char * argv[])
|
|
{
|
|
int o;
|
|
char const * format = "%a %b %e %H:%M:%S %Z %Y";
|
|
|
|
while((o = getopt(argc, argv, "")) != -1)
|
|
switch(o)
|
|
{
|
|
default:
|
|
return _usage();
|
|
}
|
|
if(argc - optind == 1 && argv[optind][0] == '+')
|
|
format = &argv[optind][1];
|
|
else if(optind != argc)
|
|
return _usage();
|
|
return (_date(format) == 0) ? 0 : 2;
|
|
}
|