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245 lines
6.1 KiB
C
245 lines
6.1 KiB
C
/*
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* Copyright (c) 1985, 1987, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: date.c,v 1.10 1997/02/22 14:02:33 peter Exp $
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*/
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char const sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <locale.h>
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#include "extern.h"
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time_t tval;
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int retval, nflag;
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static void setthetime __P((char *));
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static void badformat __P((void));
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static void usage __P((void));
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int logwtmp __P((char *, char *, char *));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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extern int optind;
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extern char *optarg;
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struct timezone tz;
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int ch, rflag;
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char *format, buf[1024];
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char *endptr;
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int set_timezone;
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(void) setlocale(LC_TIME, "");
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tz.tz_dsttime = tz.tz_minuteswest = 0;
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rflag = 0;
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set_timezone = 0;
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while ((ch = getopt(argc, argv, "d:nr:ut:")) != -1)
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switch((char)ch) {
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case 'd': /* daylight savings time */
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tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
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if (endptr == optarg || *endptr != '\0')
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usage();
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set_timezone = 1;
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break;
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case 'n': /* don't set network */
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nflag = 1;
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break;
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case 'r': /* user specified seconds */
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rflag = 1;
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tval = atol(optarg);
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break;
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case 'u': /* do everything in GMT */
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(void)setenv("TZ", "GMT0", 1);
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break;
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case 't': /* minutes west of GMT */
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/* error check; don't allow "PST" */
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tz.tz_minuteswest = strtol(optarg, &endptr, 10);
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if (endptr == optarg || *endptr != '\0')
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usage();
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set_timezone = 1;
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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/*
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* If -d or -t, set the timezone or daylight savings time; this
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* doesn't belong here, there kernel should not know about either.
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*/
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if (set_timezone && settimeofday((struct timeval *)NULL, &tz))
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err(1, "settimeofday (timezone)");
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if (!rflag && time(&tval) == -1)
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err(1, "time");
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format = "%+";
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/* allow the operands in any order */
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if (*argv && **argv == '+') {
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format = *argv + 1;
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++argv;
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}
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if (*argv) {
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setthetime(*argv);
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++argv;
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}
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if (*argv && **argv == '+')
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format = *argv + 1;
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(void)strftime(buf, sizeof(buf), format, localtime(&tval));
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(void)printf("%s\n", buf);
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exit(retval);
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}
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#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
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void
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setthetime(p)
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register char *p;
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{
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register struct tm *lt;
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struct timeval tv;
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char *dot, *t;
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for (t = p, dot = NULL; *t; ++t) {
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if (isdigit(*t))
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continue;
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if (*t == '.' && dot == NULL) {
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dot = t;
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continue;
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}
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badformat();
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}
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lt = localtime(&tval);
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if (dot != NULL) { /* .ss */
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*dot++ = '\0';
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if (strlen(dot) != 2)
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badformat();
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lt->tm_sec = ATOI2(dot);
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if (lt->tm_sec > 61)
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badformat();
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} else
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lt->tm_sec = 0;
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switch (strlen(p)) {
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case 10: /* yy */
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lt->tm_year = ATOI2(p);
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if (lt->tm_year < 69) /* hack for 2000 ;-} */
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lt->tm_year += 100;
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/* FALLTHROUGH */
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case 8: /* mm */
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lt->tm_mon = ATOI2(p);
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if (lt->tm_mon > 12)
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badformat();
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--lt->tm_mon; /* time struct is 0 - 11 */
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/* FALLTHROUGH */
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case 6: /* dd */
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lt->tm_mday = ATOI2(p);
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if (lt->tm_mday > 31)
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badformat();
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/* FALLTHROUGH */
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case 4: /* hh */
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lt->tm_hour = ATOI2(p);
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if (lt->tm_hour > 23)
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badformat();
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/* FALLTHROUGH */
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case 2: /* mm */
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lt->tm_min = ATOI2(p);
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if (lt->tm_min > 59)
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badformat();
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break;
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default:
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badformat();
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}
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/* convert broken-down time to GMT clock time */
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if ((tval = mktime(lt)) == -1)
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errx(1, "nonexistent time");
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/* set the time */
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if (nflag || netsettime(tval)) {
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logwtmp("|", "date", "");
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tv.tv_sec = tval;
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tv.tv_usec = 0;
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if (settimeofday(&tv, (struct timezone *)NULL))
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err(1, "settimeofday (timeval)");
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logwtmp("{", "date", "");
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}
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if ((p = getlogin()) == NULL)
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p = "???";
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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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{
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warnx("illegal time format");
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usage();
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}
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static void
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usage()
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{
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(void)fprintf(stderr,
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"usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]\n");
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(void)fprintf(stderr, " [yy[mm[dd[hh]]]]mm[.ss]]\n");
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exit(1);
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}
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