date.c revision 1.9 
1/*	$NetBSD: date.c,v 1.9 1995/03/21 09:03:50 cgd Exp $	*/
2
3/*
4 * Copyright (c) 1985, 1987, 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#ifndef lint
37static char copyright[] =
38"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif /* not lint */
41
42#ifndef lint
43static char sccsid[] = "@(#)date.c	8.1 (Berkeley) 5/31/93";
44#endif /* not lint */
45
46#include <sys/param.h>
47#include <sys/time.h>
48
49#include <ctype.h>
50#include <err.h>
51#include <fcntl.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <locale.h>
56#include <syslog.h>
57#include <unistd.h>
58
59#include "extern.h"
60
61time_t tval;
62int retval, nflag;
63
64static void setthetime __P((char *));
65static void badformat __P((void));
66static void usage __P((void));
67
68int logwtmp __P((char *, char *, char *));
69
70int
71main(argc, argv)
72	int argc;
73	char **argv;
74{
75	extern int optind;
76	extern char *optarg;
77	struct timezone tz;
78	int ch, rflag;
79	char *format, buf[1024];
80
81	setlocale(LC_ALL, "");
82
83	tz.tz_dsttime = tz.tz_minuteswest = 0;
84	rflag = 0;
85	while ((ch = getopt(argc, argv, "d:nr:ut:")) != -1)
86		switch((char)ch) {
87		case 'd':		/* daylight savings time */
88			tz.tz_dsttime = atoi(optarg) ? 1 : 0;
89			break;
90		case 'n':		/* don't set network */
91			nflag = 1;
92			break;
93		case 'r':		/* user specified seconds */
94			rflag = 1;
95			tval = atol(optarg);
96			break;
97		case 'u':		/* do everything in GMT */
98			(void)setenv("TZ", "GMT0", 1);
99			break;
100		case 't':		/* minutes west of GMT */
101					/* error check; don't allow "PST" */
102			if (isdigit(*optarg)) {
103				tz.tz_minuteswest = atoi(optarg);
104				break;
105			}
106			/* FALLTHROUGH */
107		default:
108			usage();
109		}
110	argc -= optind;
111	argv += optind;
112
113	/*
114	 * If -d or -t, set the timezone or daylight savings time; this
115	 * doesn't belong here, there kernel should not know about either.
116	 */
117	if ((tz.tz_minuteswest || tz.tz_dsttime) &&
118	    settimeofday(NULL, &tz))
119		err(1, "settimeofday");
120
121	if (!rflag && time(&tval) == -1)
122		err(1, "time");
123
124	format = "%a %b %e %H:%M:%S %Z %Y";
125
126	/* allow the operands in any order */
127	if (*argv && **argv == '+') {
128		format = *argv + 1;
129		++argv;
130	}
131
132	if (*argv) {
133		setthetime(*argv);
134		++argv;
135	}
136
137	if (*argv && **argv == '+')
138		format = *argv + 1;
139
140	(void)strftime(buf, sizeof(buf), format, localtime(&tval));
141	(void)printf("%s\n", buf);
142	exit(retval);
143}
144
145#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
146void
147setthetime(p)
148	register char *p;
149{
150	register struct tm *lt;
151	struct timeval tv;
152	char *dot, *t;
153
154	for (t = p, dot = NULL; *t; ++t) {
155		if (isdigit(*t))
156			continue;
157		if (*t == '.' && dot == NULL) {
158			dot = t;
159			continue;
160		}
161		badformat();
162	}
163
164	lt = localtime(&tval);
165
166	if (dot != NULL) {			/* .ss */
167		*dot++ = '\0';
168		if (strlen(dot) != 2)
169			badformat();
170		lt->tm_sec = ATOI2(dot);
171		if (lt->tm_sec > 61)
172			badformat();
173	} else
174		lt->tm_sec = 0;
175
176	switch (strlen(p)) {
177	case 10:				/* yy */
178		lt->tm_year = ATOI2(p);
179		if (lt->tm_year < 69)		/* hack for 2000 ;-} */
180			lt->tm_year += 100;
181		/* FALLTHROUGH */
182	case 8:					/* mm */
183		lt->tm_mon = ATOI2(p);
184		if (lt->tm_mon > 12)
185			badformat();
186		--lt->tm_mon;			/* time struct is 0 - 11 */
187		/* FALLTHROUGH */
188	case 6:					/* dd */
189		lt->tm_mday = ATOI2(p);
190		if (lt->tm_mday > 31)
191			badformat();
192		/* FALLTHROUGH */
193	case 4:					/* hh */
194		lt->tm_hour = ATOI2(p);
195		if (lt->tm_hour > 23)
196			badformat();
197		/* FALLTHROUGH */
198	case 2:					/* mm */
199		lt->tm_min = ATOI2(p);
200		if (lt->tm_min > 59)
201			badformat();
202		break;
203	default:
204		badformat();
205	}
206
207	/* convert broken-down time to GMT clock time */
208	if ((tval = mktime(lt)) == -1)
209		badformat();
210
211	/* set the time */
212	if (nflag || netsettime(tval)) {
213		logwtmp("|", "date", "");
214		tv.tv_sec = tval;
215		tv.tv_usec = 0;
216		if (settimeofday(&tv, NULL)) {
217			perror("date: settimeofday");
218			exit(1);
219		}
220		logwtmp("{", "date", "");
221	}
222
223	if ((p = getlogin()) == NULL)
224		p = "???";
225	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
226}
227
228static void
229badformat()
230{
231	warnx("illegal time format");
232	usage();
233}
234
235static void
236usage()
237{
238	(void)fprintf(stderr,
239	    "usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]\n");
240	(void)fprintf(stderr, "            [yy[mm[dd[hh]]]]mm[.ss]]\n");
241	exit(1);
242}
243