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/* date - print or set the system date and time
Copyright (C) 89, 90, 91, 92, 93, 1994 Free Software Foundation, Inc.
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, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Options:
-d DATESTR Display the date DATESTR.
-s DATESTR Set the date to DATESTR.
-u Display or set the date in universal instead of local time.
+FORMAT Specify custom date output format, described below.
MMDDhhmm[[CC]YY][.ss] Set the date in the format described below.
If one non-option argument is given, it is used as the date to which
to set the system clock, and must have the format:
MM month (01..12)
DD day in month (01..31)
hh hour (00..23)
mm minute (00..59)
CC first 2 digits of year (optional, defaults to current) (00..99)
YY last 2 digits of year (optional, defaults to current) (00..99)
ss second (00..61)
If a non-option argument that starts with a `+' is specified, it
is used to control the format in which the date is printed; it
can contain any of the `%' substitutions allowed by the strftime
function. A newline is always added at the end of the output.
David MacKenzie <djm@gnu.ai.mit.edu> */
#ifdef HAVE_CONFIG_H
#if defined (CONFIG_BROKETS)
/* We use <config.h> instead of "config.h" so that a compilation
using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
(which it would do because it found this file in $srcdir). */
#include <config.h>
#else
#include "config.h"
#endif
#endif
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "version.h"
#include "system.h"
#ifdef TM_IN_SYS_TIME
#include <sys/time.h>
#else
#include <time.h>
#endif
#ifndef STDC_HEADERS
size_t strftime ();
time_t time ();
#endif
int stime ();
char *xrealloc ();
time_t get_date ();
time_t posixtime ();
void error ();
static void show_date ();
static void usage ();
/* The name this program was run with, for error messages. */
char *program_name;
/* If non-zero, display usage information and exit. */
static int show_help;
/* If non-zero, print the version on standard output and exit. */
static int show_version;
static struct option const long_options[] =
{
{"date", required_argument, NULL, 'd'},
{"help", no_argument, &show_help, 1},
{"set", required_argument, NULL, 's'},
{"uct", no_argument, NULL, 'u'},
{"utc", no_argument, NULL, 'u'},
{"universal", no_argument, NULL, 'u'},
{"version", no_argument, &show_version, 1},
{NULL, 0, NULL, 0}
};
static int universal_time = 0;
void
main (argc, argv)
int argc;
char **argv;
{
int optc;
char *datestr = NULL;
time_t when;
int set_date = 0;
int print_date = 0;
char *format;
int n_args;
program_name = argv[0];
while ((optc = getopt_long (argc, argv, "d:s:u", long_options, (int *) 0))
!= EOF)
switch (optc)
{
case 0:
break;
case 'd':
datestr = optarg;
print_date = 1;
break;
case 's':
datestr = optarg;
set_date = 1;
break;
case 'u':
universal_time = 1;
break;
default:
usage (1);
}
if (show_version)
{
printf ("date - %s\n", version_string);
exit (0);
}
if (show_help)
usage (0);
n_args = argc - optind;
if (set_date && print_date)
{
error (0, 0,
"the options to print and set the time may not be used together");
usage (1);
}
if (n_args > 1)
{
error (0, 0, "too many non-option arguments");
usage (1);
}
if ((set_date || print_date) && n_args == 1 && argv[optind][0] != '+')
{
error (0, 0, "\
when using the print or set time option, the sole\n\
non-option argument must be a format string beginning with `+'");
usage (1);
}
if (!print_date && !set_date)
{
if (n_args == 1 && argv[optind][0] != '+')
{
/* Prepare to set system clock to the specified date/time given in
the POSIX-format. */
set_date = 1;
datestr = argv[optind];
when = posixtime (datestr);
format = NULL;
}
else
{
/* Prepare to print the current date/time. */
print_date = 1;
datestr = "undefined";
time (&when);
format = (n_args == 1 ? argv[optind] + 1 : NULL);
}
}
else
{
/* (print_date || set_date) */
when = get_date (datestr, NULL);
format = (n_args == 1 ? argv[optind] + 1 : NULL);
}
if (when == -1)
error (1, 0, "invalid date `%s'", datestr);
if (set_date)
{
/* Set the system clock to the specified date, then regardless of
the success of that operation, format and print that date. */
if (stime (&when) == -1)
error (0, errno, "cannot set date");
}
show_date (format, when);
exit (0);
}
/* Display the date and/or time in WHEN according to the format specified
in FORMAT, followed by a newline. If FORMAT is NULL, use the
standard output format (ctime style but with a timezone inserted). */
static void
show_date (format, when)
char *format;
time_t when;
{
struct tm *tm;
char *out = NULL;
size_t out_length = 0;
tm = (universal_time ? gmtime : localtime) (&when);
if (format == NULL)
{
/* Print the date in the default format. Vanilla ANSI C strftime
doesn't support %e, but POSIX requires it. If you don't use
a GNU strftime, make sure yours supports %e. */
format = (universal_time
? "%a %b %e %H:%M:%S UTC %Y"
: "%a %b %e %H:%M:%S %Z %Y");
}
else if (*format == '\0')
{
printf ("\n");
return;
}
do
{
out_length += 200;
out = (char *) xrealloc (out, out_length);
}
while (strftime (out, out_length, format, tm) == 0);
printf ("%s\n", out);
free (out);
}
static void
usage (status)
int status;
{
if (status != 0)
fprintf (stderr, "Try `%s --help' for more information.\n",
program_name);
else
{
printf ("\
Usage: %s [OPTION]... [+FORMAT]\n\
or: %s [-u] [--utc] [--universal] [MMDDhhmm[[CC]YY][.ss]]\n\
",
program_name, program_name);
printf ("\
\n\
-d, --date=STRING display time described by STRING, not `now'\n\
-s, --set=STRING set time described by STRING\n\
-u, --utc, --universal print or set Coordinated Universal Time\n\
--help display this help and exit\n\
--version output version information and exit\n\
");
printf ("\
\n\
FORMAT controls the output. Interpreted sequences are:\n\
\n\
%%%% a literal %%\n\
%%a locale's abbreviated weekday name (Sun..Sat)\n\
%%A locale's full weekday name, variable length (Sunday..Saturday)\n\
%%b locale's abbreviated month name (Jan..Dec)\n\
%%B locale's full month name, variable length (January..December)\n\
%%c locale's date and time (Sat Nov 04 12:02:33 EST 1989)\n\
%%d day of month (01..31)\n\
%%D date (mm/dd/yy)\n\
%%h same as %%b\n\
%%H hour (00..23)\n\
%%I hour (01..12)\n\
%%j day of year (001..366)\n\
%%k hour ( 0..23)\n\
%%l hour ( 1..12)\n\
%%m month (01..12)\n\
%%M minute (00..59)\n\
%%n a newline\n\
%%p locale's AM or PM\n\
%%r time, 12-hour (hh:mm:ss [AP]M)\n\
%%s seconds since 00:00:00, Jan 1, 1970 (a GNU extension)\n\
%%S second (00..61)\n\
%%t a horizontal tab\n\
%%T time, 24-hour (hh:mm:ss)\n\
%%U week number of year with Sunday as first day of week (00..53)\n\
%%w day of week (0..6); 0 represents Sunday\n\
%%W week number of year with Monday as first day of week (00..53)\n\
%%x locale's date representation (mm/dd/yy)\n\
%%X locale's time representation (%%H:%%M:%%S)\n\
%%y last two digits of year (00..99)\n\
%%Y year (1970...)\n\
%%Z time zone (e.g., EDT), or nothing if no time zone is determinable\n\
\n\
By default, `date' pads numeric fields with zeroes. GNU `date'\n\
recognizes the following nonstandard modifiers between `%' and a\n\
numeric directive.\n\
\n\
`-' (hyphen) do not pad the field\n\
`_' (underscore) pad the field with spaces\n\
");
}
exit (status);
}
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