date.c revision 1.16 
1/*	$NetBSD: date.c,v 1.16 1997/11/05 21:20:51 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#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 1.16 1997/11/05 21:20:51 cgd 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 <unistd.h>
63#include <util.h>
64
65#include "extern.h"
66
67time_t tval;
68int retval, nflag;
69
70int main __P((int, char *[]));
71static void setthetime __P((char *));
72static void badformat __P((void));
73static void usage __P((void));
74
75int
76main(argc, argv)
77	int argc;
78	char *argv[];
79{
80	extern int optind;
81	extern char *optarg;
82	int ch, rflag;
83	char *format, buf[1024];
84
85	(void)setlocale(LC_ALL, "");
86
87	rflag = 0;
88	while ((ch = getopt(argc, argv, "nr:u")) != -1)
89		switch((char)ch) {
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		default:
101			usage();
102		}
103	argc -= optind;
104	argv += optind;
105
106	if (!rflag && time(&tval) == -1)
107		err(1, "time");
108
109	format = "%a %b %e %H:%M:%S %Z %Y";
110
111	/* allow the operands in any order */
112	if (*argv && **argv == '+') {
113		format = *argv + 1;
114		++argv;
115	}
116
117	if (*argv) {
118		setthetime(*argv);
119		++argv;
120	}
121
122	if (*argv && **argv == '+')
123		format = *argv + 1;
124
125	(void)strftime(buf, sizeof(buf), format, localtime(&tval));
126	(void)printf("%s\n", buf);
127	exit(retval);
128	/* NOTREACHED */
129}
130
131#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
132void
133setthetime(p)
134	char *p;
135{
136	struct tm *lt;
137	struct timeval tv;
138	char *dot, *t;
139
140	for (t = p, dot = NULL; *t; ++t) {
141		if (isdigit(*t))
142			continue;
143		if (*t == '.' && dot == NULL) {
144			dot = t;
145			continue;
146		}
147		badformat();
148	}
149
150	lt = localtime(&tval);
151
152	if (dot != NULL) {			/* .ss */
153		*dot++ = '\0';
154		if (strlen(dot) != 2)
155			badformat();
156		lt->tm_sec = ATOI2(dot);
157		if (lt->tm_sec > 61)
158			badformat();
159	} else
160		lt->tm_sec = 0;
161
162	switch (strlen(p)) {
163	case 10:				/* yy */
164		lt->tm_year = ATOI2(p);
165		if (lt->tm_year < 69)		/* hack for 2000 ;-} */
166			lt->tm_year += 100;
167		/* FALLTHROUGH */
168	case 8:					/* mm */
169		lt->tm_mon = ATOI2(p);
170		if (lt->tm_mon > 12)
171			badformat();
172		--lt->tm_mon;			/* time struct is 0 - 11 */
173		/* FALLTHROUGH */
174	case 6:					/* dd */
175		lt->tm_mday = ATOI2(p);
176		if (lt->tm_mday > 31)
177			badformat();
178		/* FALLTHROUGH */
179	case 4:					/* hh */
180		lt->tm_hour = ATOI2(p);
181		if (lt->tm_hour > 23)
182			badformat();
183		/* FALLTHROUGH */
184	case 2:					/* mm */
185		lt->tm_min = ATOI2(p);
186		if (lt->tm_min > 59)
187			badformat();
188		break;
189	default:
190		badformat();
191	}
192
193	/* convert broken-down time to GMT clock time */
194	if ((tval = mktime(lt)) == -1)
195		badformat();
196
197	/* set the time */
198	if (nflag || netsettime(tval)) {
199		logwtmp("|", "date", "");
200		tv.tv_sec = tval;
201		tv.tv_usec = 0;
202		if (settimeofday(&tv, NULL)) {
203			perror("date: settimeofday");
204			exit(1);
205		}
206		logwtmp("{", "date", "");
207	}
208
209	if ((p = getlogin()) == NULL)
210		p = "???";
211	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
212}
213
214static void
215badformat()
216{
217	warnx("illegal time format");
218	usage();
219}
220
221static void
222usage()
223{
224	(void)fprintf(stderr,
225	    "usage: date [-nu] [-r seconds] [+format]\n");
226	(void)fprintf(stderr, "            [yy[mm[dd[hh]]]]mm[.ss]]\n");
227	exit(1);
228}
229