date.c revision 1.14 
1/*	$NetBSD: date.c,v 1.14 1997/03/26 20:28:11 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
43#if 0
44static char sccsid[] = "@(#)date.c	8.2 (Berkeley) 4/28/95";
45#else
46static char rcsid[] = "$NetBSD: date.c,v 1.14 1997/03/26 20:28:11 cgd Exp $";
47#endif
48#endif /* not lint */
49
50#include <sys/param.h>
51#include <sys/time.h>
52
53#include <ctype.h>
54#include <err.h>
55#include <fcntl.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <locale.h>
60#include <syslog.h>
61#include <unistd.h>
62#include <util.h>
63
64#include "extern.h"
65
66time_t tval;
67int retval, nflag;
68
69static void setthetime __P((char *));
70static void badformat __P((void));
71static void usage __P((void));
72
73int
74main(argc, argv)
75	int argc;
76	char **argv;
77{
78	extern int optind;
79	extern char *optarg;
80	int ch, rflag;
81	char *format, buf[1024];
82
83	setlocale(LC_ALL, "");
84
85	rflag = 0;
86	while ((ch = getopt(argc, argv, "nr:u")) != -1)
87		switch((char)ch) {
88		case 'n':		/* don't set network */
89			nflag = 1;
90			break;
91		case 'r':		/* user specified seconds */
92			rflag = 1;
93			tval = atol(optarg);
94			break;
95		case 'u':		/* do everything in GMT */
96			(void)setenv("TZ", "GMT0", 1);
97			break;
98		default:
99			usage();
100		}
101	argc -= optind;
102	argv += optind;
103
104	if (!rflag && time(&tval) == -1)
105		err(1, "time");
106
107	format = "%a %b %e %H:%M:%S %Z %Y";
108
109	/* allow the operands in any order */
110	if (*argv && **argv == '+') {
111		format = *argv + 1;
112		++argv;
113	}
114
115	if (*argv) {
116		setthetime(*argv);
117		++argv;
118	}
119
120	if (*argv && **argv == '+')
121		format = *argv + 1;
122
123	(void)strftime(buf, sizeof(buf), format, localtime(&tval));
124	(void)printf("%s\n", buf);
125	exit(retval);
126}
127
128#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
129void
130setthetime(p)
131	char *p;
132{
133	struct tm *lt;
134	struct timeval tv;
135	char *dot, *t;
136
137	for (t = p, dot = NULL; *t; ++t) {
138		if (isdigit(*t))
139			continue;
140		if (*t == '.' && dot == NULL) {
141			dot = t;
142			continue;
143		}
144		badformat();
145	}
146
147	lt = localtime(&tval);
148
149	if (dot != NULL) {			/* .ss */
150		*dot++ = '\0';
151		if (strlen(dot) != 2)
152			badformat();
153		lt->tm_sec = ATOI2(dot);
154		if (lt->tm_sec > 61)
155			badformat();
156	} else
157		lt->tm_sec = 0;
158
159	switch (strlen(p)) {
160	case 10:				/* yy */
161		lt->tm_year = ATOI2(p);
162		if (lt->tm_year < 69)		/* hack for 2000 ;-} */
163			lt->tm_year += 100;
164		/* FALLTHROUGH */
165	case 8:					/* mm */
166		lt->tm_mon = ATOI2(p);
167		if (lt->tm_mon > 12)
168			badformat();
169		--lt->tm_mon;			/* time struct is 0 - 11 */
170		/* FALLTHROUGH */
171	case 6:					/* dd */
172		lt->tm_mday = ATOI2(p);
173		if (lt->tm_mday > 31)
174			badformat();
175		/* FALLTHROUGH */
176	case 4:					/* hh */
177		lt->tm_hour = ATOI2(p);
178		if (lt->tm_hour > 23)
179			badformat();
180		/* FALLTHROUGH */
181	case 2:					/* mm */
182		lt->tm_min = ATOI2(p);
183		if (lt->tm_min > 59)
184			badformat();
185		break;
186	default:
187		badformat();
188	}
189
190	/* convert broken-down time to GMT clock time */
191	if ((tval = mktime(lt)) == -1)
192		badformat();
193
194	/* set the time */
195	if (nflag || netsettime(tval)) {
196		logwtmp("|", "date", "");
197		tv.tv_sec = tval;
198		tv.tv_usec = 0;
199		if (settimeofday(&tv, NULL)) {
200			perror("date: settimeofday");
201			exit(1);
202		}
203		logwtmp("{", "date", "");
204	}
205
206	if ((p = getlogin()) == NULL)
207		p = "???";
208	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
209}
210
211static void
212badformat()
213{
214	warnx("illegal time format");
215	usage();
216}
217
218static void
219usage()
220{
221	(void)fprintf(stderr,
222	    "usage: date [-nu] [-r seconds] [+format]\n");
223	(void)fprintf(stderr, "            [yy[mm[dd[hh]]]]mm[.ss]]\n");
224	exit(1);
225}
226