freebsd-src/bin/date/date.c
Daniel Baker d5dc63cc0a Correct confusion and differentiate appropriately between GMT and UTC when
date is launched with the "u" argument.  It now operates in the documented
manner.

Fix typo in date man page.

Submitted by:	David McNett <nugget@slacker.com>
2000-05-19 18:02:25 +00:00

310 lines
7.5 KiB
C

/*
* 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. 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
static char const 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";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <locale.h>
#include "extern.h"
#include "vary.h"
#ifndef TM_YEAR_BASE
#define TM_YEAR_BASE 1900
#endif
time_t tval;
int retval;
static void setthetime __P((const char *, const char *, int, int));
static void badformat __P((void));
static void usage __P((void));
int logwtmp __P((char *, char *, char *));
int
main(argc, argv)
int argc;
char **argv;
{
extern int optind;
extern char *optarg;
struct timezone tz;
int ch, rflag;
int jflag, nflag;
char *format, buf[1024];
char *endptr, *fmt;
int set_timezone;
struct vary *v;
const struct vary *badv;
struct tm lt;
v = NULL;
fmt = NULL;
(void) setlocale(LC_TIME, "");
tz.tz_dsttime = tz.tz_minuteswest = 0;
rflag = 0;
jflag = nflag = 0;
set_timezone = 0;
while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1)
switch((char)ch) {
case 'd': /* daylight savings time */
tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
if (endptr == optarg || *endptr != '\0')
usage();
set_timezone = 1;
break;
case 'f':
fmt = optarg;
break;
case 'j':
jflag = 1; /* don't set time */
break;
case 'n': /* don't set network */
nflag = 1;
break;
case 'r': /* user specified seconds */
rflag = 1;
tval = atol(optarg);
break;
case 't': /* minutes west of UTC */
/* error check; don't allow "PST" */
tz.tz_minuteswest = strtol(optarg, &endptr, 10);
if (endptr == optarg || *endptr != '\0')
usage();
set_timezone = 1;
break;
case 'u': /* do everything in UTC */
(void)setenv("TZ", "UTC0", 1);
break;
case 'v':
v = vary_append(v, optarg);
break;
default:
usage();
}
argc -= optind;
argv += optind;
/*
* If -d or -t, set the timezone or daylight savings time; this
* doesn't belong here; the kernel should not know about either.
*/
if (set_timezone && settimeofday((struct timeval *)NULL, &tz))
err(1, "settimeofday (timezone)");
if (!rflag && time(&tval) == -1)
err(1, "time");
format = "%+";
/* allow the operands in any order */
if (*argv && **argv == '+') {
format = *argv + 1;
++argv;
}
if (*argv) {
setthetime(fmt, *argv, jflag, nflag);
++argv;
} else if (fmt != NULL)
usage();
if (*argv && **argv == '+')
format = *argv + 1;
lt = *localtime(&tval);
badv = vary_apply(v, &lt);
if (badv) {
fprintf(stderr, "%s: Cannot apply date adjustment\n",
badv->arg);
vary_destroy(v);
usage();
}
vary_destroy(v);
(void)strftime(buf, sizeof(buf), format, &lt);
(void)printf("%s\n", buf);
exit(retval);
}
#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
void
setthetime(fmt, p, jflag, nflag)
const char *fmt;
register const char *p;
int jflag, nflag;
{
register struct tm *lt;
struct timeval tv;
const char *dot, *t;
int century;
if (fmt != NULL) {
lt = localtime(&tval);
t = strptime(p, fmt, lt);
if (t == NULL) {
fprintf(stderr, "Failed conversion of ``%s''"
" using format ``%s''\n", p, fmt);
badformat();
} else if (*t != '\0')
fprintf(stderr, "Warning: Ignoring %ld extraneous"
" characters in date string (%s)\n",
(long) strlen(t), t);
} else {
for (t = p, dot = NULL; *t; ++t) {
if (isdigit(*t))
continue;
if (*t == '.' && dot == NULL) {
dot = t;
continue;
}
badformat();
}
lt = localtime(&tval);
if (dot != NULL) { /* .ss */
dot++; /* *dot++ = '\0'; */
if (strlen(dot) != 2)
badformat();
lt->tm_sec = ATOI2(dot);
if (lt->tm_sec > 61)
badformat();
} else
lt->tm_sec = 0;
century = 0;
/* if p has a ".ss" field then let's pretend it's not there */
switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
case 12: /* cc */
lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
century = 1;
/* FALLTHROUGH */
case 10: /* yy */
if (century)
lt->tm_year += ATOI2(p);
else { /* hack for 2000 ;-} */
lt->tm_year = ATOI2(p);
if (lt->tm_year < 69)
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)
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)
errx(1, "nonexistent time");
if (!jflag) {
/* set the time */
if (nflag || netsettime(tval)) {
logwtmp("|", "date", "");
tv.tv_sec = tval;
tv.tv_usec = 0;
if (settimeofday(&tv, (struct timezone *)NULL))
err(1, "settimeofday (timeval)");
logwtmp("{", "date", "");
}
if ((p = getlogin()) == NULL)
p = "???";
syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
}
}
static void
badformat()
{
warnx("illegal time format");
usage();
}
static void
usage()
{
(void)fprintf(stderr, "%s\n%s\n",
"usage: date [-nu] [-d dst] [-r seconds] [-t west] "
"[-v[+|-]val[ymwdHMS]] ... ",
" "
"[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
exit(1);
}