NetBSD/bin/date/date.c

226 lines
5.7 KiB
C

/*
* Copyright (c) 1985, 1987, 1988 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. 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
char copyright[] =
"@(#) Copyright (c) 1985, 1987, 1988 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)date.c 5.5 (Berkeley) 3/18/91";*/
static char rcsid[] = "$Id: date.c,v 1.6 1993/08/16 23:08:52 jtc Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/file.h>
#include <syslog.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
time_t tval;
int retval, nflag;
main(argc, argv)
int argc;
char **argv;
{
extern int optind;
extern char *optarg;
struct timezone tz;
int ch, rflag;
char *format, buf[1024];
tz.tz_dsttime = tz.tz_minuteswest = 0;
rflag = 0;
while ((ch = getopt(argc, argv, "d:nr:ut:")) != EOF)
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) &&
settimeofday((struct timeval *)NULL, &tz)) {
perror("date: settimeofday");
exit(1);
}
if (!rflag && time(&tval) == -1) {
perror("date: time");
exit(1);
}
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;
setthetime(p)
register char *p;
{
register struct tm *lt;
struct timeval tv;
int dot;
char *t;
for (t = p, dot = 0; *t; ++t)
if (!isdigit(*t) && (*t != '.' || dot++))
badformat();
lt = localtime(&tval);
if (t = index(p, '.')) { /* .ss */
*t++ = '\0';
lt->tm_sec = ATOI2(t);
if (lt->tm_sec > 61)
badformat();
} else
lt->tm_sec = 0;
for (t = p; *t; ++t)
if (!isdigit(*t))
badformat();
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();
if (!(p = getlogin())) /* single-user or no tty */
p = "root";
syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
/* set the time */
if (nflag || netsettime(tval)) {
logwtmp("|", "date", "");
tv.tv_sec = tval;
tv.tv_usec = 0;
if (settimeofday(&tv, (struct timezone *)NULL)) {
perror("date: settimeofday");
exit(1);
}
logwtmp("{", "date", "");
}
}
badformat()
{
(void)fprintf(stderr, "date: illegal time format.\n");
usage();
}
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);
}