File: [local] / src / bin / date / date.c (download)
Revision 1.26, Wed Oct 15 15:58:22 2003 UTC (20 years, 8 months ago) by mpech
Branch: MAIN
CVS Tags: OPENBSD_3_8_BASE, OPENBSD_3_8, OPENBSD_3_7_BASE, OPENBSD_3_7, OPENBSD_3_6_BASE, OPENBSD_3_6, OPENBSD_3_5_BASE, OPENBSD_3_5 Changes since 1.25: +3 -3 lines
errx -> err. From form.
millert@ ok
|
/* $OpenBSD: date.c,v 1.26 2003/10/15 15:58:22 mpech Exp $ */
/* $NetBSD: date.c,v 1.11 1995/09/07 06:21:05 jtc Exp $ */
/*
* Copyright (c) 1985, 1987, 1988, 1993
* The Regents of the University of California. 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.
* 3. 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
static char copyright[] =
"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
#else
static char rcsid[] = "$OpenBSD: date.c,v 1.26 2003/10/15 15:58:22 mpech Exp $";
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <syslog.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>
#include <util.h>
#include "extern.h"
extern char *__progname;
time_t tval;
int retval, nflag;
int slidetime;
static void setthetime(char *);
static void badformat(void);
static void usage(void);
int
main(int argc, char *argv[])
{
struct timezone tz;
int ch, rflag;
char *format, buf[1024];
setlocale(LC_ALL, "");
tz.tz_dsttime = tz.tz_minuteswest = 0;
rflag = 0;
while ((ch = getopt(argc, argv, "ad:nr:ut:")) != -1)
switch((char)ch) {
case 'd': /* daylight saving time */
tz.tz_dsttime = atoi(optarg) ? 1 : 0;
break;
case 'a':
slidetime++;
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 UTC */
if (setenv("TZ", "GMT0", 1) == -1)
err(1, "cannot unsetenv TZ");
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 saving time; this
* doesn't belong here, the kernel should not know about either.
*/
if ((tz.tz_minuteswest || tz.tz_dsttime) &&
settimeofday(NULL, &tz))
err(1, "settimeofday");
if (!rflag && time(&tval) == -1)
err(1, "time");
format = "%a %b %e %H:%M:%S %Z %Y";
/* 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);
exit(retval);
}
#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
void
setthetime(char *p)
{
struct tm *lt;
struct timeval tv;
char *dot, *t;
int bigyear;
int yearset = 0;
for (t = p, dot = NULL; *t; ++t) {
if (isdigit(*t))
continue;
if (*t == '.' && dot == NULL) {
dot = t;
continue;
}
badformat();
}
lt = localtime(&tval);
lt->tm_isdst = -1; /* correct for DST */
if (dot != NULL) { /* .SS */
*dot++ = '\0';
if (strlen(dot) != 2)
badformat();
lt->tm_sec = ATOI2(dot);
if (lt->tm_sec > 61)
badformat();
} else
lt->tm_sec = 0;
switch (strlen(p)) {
case 12: /* cc */
bigyear = ATOI2(p);
lt->tm_year = bigyear * 100 - TM_YEAR_BASE;
yearset = 1;
/* FALLTHROUGH */
case 10: /* yy */
if (yearset) {
lt->tm_year += ATOI2(p);
} else {
lt->tm_year = ATOI2(p);
if (lt->tm_year < 69) /* hack for 2000 ;-} */
lt->tm_year += (2000 - TM_YEAR_BASE);
else
lt->tm_year += (1900 - TM_YEAR_BASE);
}
/* FALLTHROUGH */
case 8: /* mm */
lt->tm_mon = ATOI2(p);
if ((lt->tm_mon > 12) || !lt->tm_mon)
badformat();
--lt->tm_mon; /* time struct is 0 - 11 */
/* FALLTHROUGH */
case 6: /* dd */
lt->tm_mday = ATOI2(p);
if ((lt->tm_mday > 31) || !lt->tm_mday)
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 UTC clock time */
if ((tval = mktime(lt)) < 0)
errx(1, "specified date is outside allowed range");
/* set the time */
if (nflag || netsettime(tval)) {
if (slidetime) {
struct timeval tv_current;
if (gettimeofday(&tv_current, NULL) == -1)
err(1, "Could not get local time of day");
tv.tv_sec = tval - tv_current.tv_sec;
tv.tv_usec = 0;
if (adjtime(&tv, NULL) == -1)
errx(1, "adjtime");
} else {
logwtmp("|", "date", "");
tv.tv_sec = tval;
tv.tv_usec = 0;
if (settimeofday(&tv, NULL))
err(1, "settimeofday");
logwtmp("{", "date", "");
}
}
if ((p = getlogin()) == NULL)
p = "???";
syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
}
static void
badformat(void)
{
warnx("illegal time format");
usage();
}
static void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-anu] [-d dst] [-r seconds] [-t west] [+format]\n",
__progname);
(void)fprintf(stderr,
"%-*s[[[[[[cc]yy]mm]dd]HH]MM[.SS]]\n", strlen(__progname) + 8, "");
exit(1);
}