freebsd-dev/bin/date/date.c
1997-10-01 05:44:35 +00:00

288 lines
7.1 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.
*
* $Id: date.c,v 1.19 1997/10/01 05:24:08 danny Exp $
*/
#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
static char const sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
#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 <syslog.h>
#include <unistd.h>
#include <locale.h>
#include "extern.h"
#include "vary.h"
time_t tval;
int retval, nflag;
static void setthetime __P((const char *, const char *));
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, sflag;
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 = sflag = 0;
set_timezone = 0;
while ((ch = getopt(argc, argv, "d:f:nr:st: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 'n': /* don't set network */
nflag = 1;
break;
case 'r': /* user specified seconds */
rflag = 1;
tval = atol(optarg);
break;
case 's':
sflag = 1;
break;
case 't': /* minutes west of GMT */
/* 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 GMT */
(void)setenv("TZ", "GMT0", 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);
++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", buf);
if (!sflag)
(void)printf("\n");
exit(retval);
}
#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
void
setthetime(fmt, p)
const char *fmt;
register const char *p;
{
register struct tm *lt;
struct timeval tv;
const char *dot, *t;
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);
lt = localtime(&tval);
return;
} else if (*t != '\0')
fprintf(stderr, "Warning: Ignoring %d extraneous"
" characters in date string (%s)\n",
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;
/* if p has a ".ss" field then let's pretend it's not there */
switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
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)
errx(1, "nonexistent time");
/* 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 [-nsu] [-d dst] [-r seconds] [-t west] [+format]",
" [-v [+|-]val[ymwdHM]] ... [-f fmt date | [[[[yy]mm]dd]HH]MM[.ss]]");
exit(1);
}