date.c revision 1.15 
1/*	$NetBSD: date.c,v 1.15 1997/07/20 05:17:33 thorpej 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 1.15 1997/07/20 05:17:33 thorpej 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	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}
129
130#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
131void
132setthetime(p)
133	char *p;
134{
135	struct tm *lt;
136	struct timeval tv;
137	char *dot, *t;
138
139	for (t = p, dot = NULL; *t; ++t) {
140		if (isdigit(*t))
141			continue;
142		if (*t == '.' && dot == NULL) {
143			dot = t;
144			continue;
145		}
146		badformat();
147	}
148
149	lt = localtime(&tval);
150
151	if (dot != NULL) {			/* .ss */
152		*dot++ = '\0';
153		if (strlen(dot) != 2)
154			badformat();
155		lt->tm_sec = ATOI2(dot);
156		if (lt->tm_sec > 61)
157			badformat();
158	} else
159		lt->tm_sec = 0;
160
161	switch (strlen(p)) {
162	case 10:				/* yy */
163		lt->tm_year = ATOI2(p);
164		if (lt->tm_year < 69)		/* hack for 2000 ;-} */
165			lt->tm_year += 100;
166		/* FALLTHROUGH */
167	case 8:					/* mm */
168		lt->tm_mon = ATOI2(p);
169		if (lt->tm_mon > 12)
170			badformat();
171		--lt->tm_mon;			/* time struct is 0 - 11 */
172		/* FALLTHROUGH */
173	case 6:					/* dd */
174		lt->tm_mday = ATOI2(p);
175		if (lt->tm_mday > 31)
176			badformat();
177		/* FALLTHROUGH */
178	case 4:					/* hh */
179		lt->tm_hour = ATOI2(p);
180		if (lt->tm_hour > 23)
181			badformat();
182		/* FALLTHROUGH */
183	case 2:					/* mm */
184		lt->tm_min = ATOI2(p);
185		if (lt->tm_min > 59)
186			badformat();
187		break;
188	default:
189		badformat();
190	}
191
192	/* convert broken-down time to GMT clock time */
193	if ((tval = mktime(lt)) == -1)
194		badformat();
195
196	/* set the time */
197	if (nflag || netsettime(tval)) {
198		logwtmp("|", "date", "");
199		tv.tv_sec = tval;
200		tv.tv_usec = 0;
201		if (settimeofday(&tv, NULL)) {
202			perror("date: settimeofday");
203			exit(1);
204		}
205		logwtmp("{", "date", "");
206	}
207
208	if ((p = getlogin()) == NULL)
209		p = "???";
210	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
211}
212
213static void
214badformat()
215{
216	warnx("illegal time format");
217	usage();
218}
219
220static void
221usage()
222{
223	(void)fprintf(stderr,
224	    "usage: date [-nu] [-r seconds] [+format]\n");
225	(void)fprintf(stderr, "            [yy[mm[dd[hh]]]]mm[.ss]]\n");
226	exit(1);
227}
228