NetBSD/bin/date/date.c

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/* $NetBSD: date.c,v 1.11 1995/09/07 06:21:05 jtc Exp $ */
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/*
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* Copyright (c) 1985, 1987, 1988, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#ifndef lint
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static char copyright[] =
"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
#ifndef lint
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#if 0
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static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
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#else
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static char rcsid[] = "$NetBSD: date.c,v 1.11 1995/09/07 06:21:05 jtc Exp $";
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#endif
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#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
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#include <ctype.h>
#include <err.h>
#include <fcntl.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <locale.h>
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#include <syslog.h>
#include <unistd.h>
#include "extern.h"
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time_t tval;
int retval, nflag;
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static void setthetime __P((char *));
static void badformat __P((void));
static void usage __P((void));
int logwtmp __P((char *, char *, char *));
int
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main(argc, argv)
int argc;
char **argv;
{
extern int optind;
extern char *optarg;
struct timezone tz;
int ch, rflag;
char *format, buf[1024];
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setlocale(LC_ALL, "");
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tz.tz_dsttime = tz.tz_minuteswest = 0;
rflag = 0;
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while ((ch = getopt(argc, argv, "d:nr:ut:")) != -1)
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switch((char)ch) {
case 'd': /* daylight savings time */
tz.tz_dsttime = atoi(optarg) ? 1 : 0;
break;
case 'n': /* don't set network */
nflag = 1;
break;
case 'r': /* user specified seconds */
rflag = 1;
tval = atol(optarg);
break;
case 'u': /* do everything in GMT */
(void)setenv("TZ", "GMT0", 1);
break;
case 't': /* minutes west of GMT */
/* error check; don't allow "PST" */
if (isdigit(*optarg)) {
tz.tz_minuteswest = atoi(optarg);
break;
}
/* FALLTHROUGH */
default:
usage();
}
argc -= optind;
argv += optind;
/*
* If -d or -t, set the timezone or daylight savings time; this
* doesn't belong here, there kernel should not know about either.
*/
if ((tz.tz_minuteswest || tz.tz_dsttime) &&
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settimeofday(NULL, &tz))
err(1, "settimeofday");
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if (!rflag && time(&tval) == -1)
err(1, "time");
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format = "%a %b %e %H:%M:%S %Z %Y";
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/* allow the operands in any order */
if (*argv && **argv == '+') {
format = *argv + 1;
++argv;
}
if (*argv) {
setthetime(*argv);
++argv;
}
if (*argv && **argv == '+')
format = *argv + 1;
(void)strftime(buf, sizeof(buf), format, localtime(&tval));
(void)printf("%s\n", buf);
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exit(retval);
}
#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
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void
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setthetime(p)
register char *p;
{
register struct tm *lt;
struct timeval tv;
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char *dot, *t;
for (t = p, dot = NULL; *t; ++t) {
if (isdigit(*t))
continue;
if (*t == '.' && dot == NULL) {
dot = t;
continue;
}
badformat();
}
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lt = localtime(&tval);
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if (dot != NULL) { /* .ss */
*dot++ = '\0';
if (strlen(dot) != 2)
badformat();
lt->tm_sec = ATOI2(dot);
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if (lt->tm_sec > 61)
badformat();
} else
lt->tm_sec = 0;
switch (strlen(p)) {
case 10: /* yy */
lt->tm_year = ATOI2(p);
if (lt->tm_year < 69) /* hack for 2000 ;-} */
lt->tm_year += 100;
/* FALLTHROUGH */
case 8: /* mm */
lt->tm_mon = ATOI2(p);
if (lt->tm_mon > 12)
badformat();
--lt->tm_mon; /* time struct is 0 - 11 */
/* FALLTHROUGH */
case 6: /* dd */
lt->tm_mday = ATOI2(p);
if (lt->tm_mday > 31)
badformat();
/* FALLTHROUGH */
case 4: /* hh */
lt->tm_hour = ATOI2(p);
if (lt->tm_hour > 23)
badformat();
/* FALLTHROUGH */
case 2: /* mm */
lt->tm_min = ATOI2(p);
if (lt->tm_min > 59)
badformat();
break;
default:
badformat();
}
/* convert broken-down time to GMT clock time */
if ((tval = mktime(lt)) == -1)
badformat();
/* set the time */
if (nflag || netsettime(tval)) {
logwtmp("|", "date", "");
tv.tv_sec = tval;
tv.tv_usec = 0;
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if (settimeofday(&tv, NULL)) {
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perror("date: settimeofday");
exit(1);
}
logwtmp("{", "date", "");
}
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if ((p = getlogin()) == NULL)
p = "???";
syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
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}
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static void
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badformat()
{
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warnx("illegal time format");
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usage();
}
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static void
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usage()
{
(void)fprintf(stderr,
"usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]\n");
(void)fprintf(stderr, " [yy[mm[dd[hh]]]]mm[.ss]]\n");
exit(1);
}