date.c revision 1.18 
1/*	$NetBSD: date.c,v 1.18 1998/01/20 21:16:39 mycroft 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#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT(
39"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n");
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)date.c	8.2 (Berkeley) 4/28/95";
46#else
47__RCSID("$NetBSD: date.c,v 1.18 1998/01/20 21:16:39 mycroft Exp $");
48#endif
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/time.h>
53
54#include <ctype.h>
55#include <err.h>
56#include <fcntl.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <locale.h>
61#include <syslog.h>
62#include <tzfile.h>
63#include <unistd.h>
64#include <util.h>
65
66#include "extern.h"
67
68time_t tval;
69int retval, nflag;
70
71int main __P((int, char *[]));
72static void setthetime __P((char *));
73static void badformat __P((void));
74static void usage __P((void));
75
76int
77main(argc, argv)
78	int argc;
79	char *argv[];
80{
81	extern int optind;
82	extern char *optarg;
83	int ch, rflag;
84	char *format, buf[1024];
85
86	(void)setlocale(LC_ALL, "");
87
88	rflag = 0;
89	while ((ch = getopt(argc, argv, "nr:u")) != -1)
90		switch((char)ch) {
91		case 'n':		/* don't set network */
92			nflag = 1;
93			break;
94		case 'r':		/* user specified seconds */
95			rflag = 1;
96			tval = atol(optarg);
97			break;
98		case 'u':		/* do everything in GMT */
99			(void)setenv("TZ", "GMT0", 1);
100			break;
101		default:
102			usage();
103		}
104	argc -= optind;
105	argv += optind;
106
107	if (!rflag && time(&tval) == -1)
108		err(1, "time");
109
110	format = "%a %b %e %H:%M:%S %Z %Y";
111
112	/* allow the operands in any order */
113	if (*argv && **argv == '+') {
114		format = *argv + 1;
115		++argv;
116	}
117
118	if (*argv) {
119		setthetime(*argv);
120		++argv;
121	}
122
123	if (*argv && **argv == '+')
124		format = *argv + 1;
125
126	(void)strftime(buf, sizeof(buf), format, localtime(&tval));
127	(void)printf("%s\n", buf);
128	exit(retval);
129	/* NOTREACHED */
130}
131
132#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
133void
134setthetime(p)
135	char *p;
136{
137	struct tm *lt;
138	struct timeval tv;
139	char *dot, *t;
140	int yearset;
141
142	for (t = p, dot = NULL; *t; ++t) {
143		if (isdigit(*t))
144			continue;
145		if (*t == '.' && dot == NULL) {
146			dot = t;
147			continue;
148		}
149		badformat();
150	}
151
152	lt = localtime(&tval);
153
154	if (dot != NULL) {			/* .ss */
155		*dot++ = '\0';
156		if (strlen(dot) != 2)
157			badformat();
158		lt->tm_sec = ATOI2(dot);
159		if (lt->tm_sec > 61)
160			badformat();
161	} else
162		lt->tm_sec = 0;
163
164	yearset = 0;
165	switch (strlen(p)) {
166	case 12:
167		lt->tm_year = ATOI2(p);
168		lt->tm_year *= 100;
169		yearset = 1;
170		/* FALLTHROUGH */
171	case 10:				/* yy */
172		if (yearset) {
173			yearset = ATOI2(p);
174			lt->tm_year += yearset;
175		} else {
176			yearset = ATOI2(p);
177			if (yearset < 69)		/* hack for 2000 ;-} */
178				lt->tm_year = yearset + 2000;
179			else
180				lt->tm_year = yearset + 1900;
181		}
182		lt->tm_year -= TM_YEAR_BASE;
183		/* FALLTHROUGH */
184	case 8:					/* mm */
185		lt->tm_mon = ATOI2(p);
186		if (lt->tm_mon > 12)
187			badformat();
188		--lt->tm_mon;			/* time struct is 0 - 11 */
189		/* FALLTHROUGH */
190	case 6:					/* dd */
191		lt->tm_mday = ATOI2(p);
192		if (lt->tm_mday > 31)
193			badformat();
194		/* FALLTHROUGH */
195	case 4:					/* hh */
196		lt->tm_hour = ATOI2(p);
197		if (lt->tm_hour > 23)
198			badformat();
199		/* FALLTHROUGH */
200	case 2:					/* mm */
201		lt->tm_min = ATOI2(p);
202		if (lt->tm_min > 59)
203			badformat();
204		break;
205	default:
206		badformat();
207	}
208
209	/* convert broken-down time to GMT clock time */
210	if ((tval = mktime(lt)) == -1)
211		badformat();
212
213	/* set the time */
214	if (nflag || netsettime(tval)) {
215		logwtmp("|", "date", "");
216		tv.tv_sec = tval;
217		tv.tv_usec = 0;
218		if (settimeofday(&tv, NULL)) {
219			perror("date: settimeofday");
220			exit(1);
221		}
222		logwtmp("{", "date", "");
223	}
224
225	if ((p = getlogin()) == NULL)
226		p = "???";
227	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
228}
229
230static void
231badformat()
232{
233	warnx("illegal time format");
234	usage();
235}
236
237static void
238usage()
239{
240	(void)fprintf(stderr,
241	    "usage: date [-nu] [-r seconds] [+format]\n");
242	(void)fprintf(stderr, "            [yy[mm[dd[hh]]]]mm[.ss]]\n");
243	exit(1);
244}
245