date.c revision 1.30.4.1 
1/*	$NetBSD: date.c,v 1.30.4.1 2000/10/09 12:09:09 bjh21 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 1.30.4.1 2000/10/09 12:09:09 bjh21 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 <time.h>
63#include <tzfile.h>
64#include <unistd.h>
65#include <util.h>
66
67#include "extern.h"
68
69time_t tval;
70int retval, nflag;
71
72int main __P((int, char *[]));
73static void setthetime __P((const char *));
74static void badformat __P((void));
75static void badtime __P((void));
76static void usage __P((void));
77
78int
79main(argc, argv)
80	int argc;
81	char *argv[];
82{
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 UTC */
99			(void)putenv("TZ=UTC0");
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(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
133
134void
135setthetime(p)
136	const char *p;
137{
138	struct tm *lt;
139	struct timeval tv;
140	const char *dot, *t;
141	int yearset, len;
142
143	for (t = p, dot = NULL; *t; ++t) {
144		if (isdigit((unsigned char)*t))
145			continue;
146		if (*t == '.' && dot == NULL) {
147			dot = t;
148			continue;
149		}
150		badformat();
151	}
152
153	lt = localtime(&tval);
154
155	lt->tm_isdst = -1;			/* Divine correct DST */
156
157	if (dot != NULL) {			/* .ss */
158		len = strlen(dot);
159		if (len != 3)
160			badformat();
161		++dot;
162		lt->tm_sec = ATOI2(dot);
163	} else {
164		len = 0;
165		lt->tm_sec = 0;
166	}
167
168	yearset = 0;
169	switch (strlen(p) - len) {
170	case 12:				/* cc */
171		lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
172		yearset = 1;
173		/* FALLTHROUGH */
174	case 10:				/* yy */
175		if (yearset) {
176			lt->tm_year += ATOI2(p);
177		} else {
178			yearset = ATOI2(p);
179			if (yearset < 69)
180				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
181			else
182				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
183		}
184		/* FALLTHROUGH */
185	case 8:					/* mm */
186		lt->tm_mon = ATOI2(p);
187		--lt->tm_mon;			/* time struct is 0 - 11 */
188		/* FALLTHROUGH */
189	case 6:					/* dd */
190		lt->tm_mday = ATOI2(p);
191		/* FALLTHROUGH */
192	case 4:					/* hh */
193		lt->tm_hour = ATOI2(p);
194		/* FALLTHROUGH */
195	case 2:					/* mm */
196		lt->tm_min = ATOI2(p);
197		break;
198	default:
199		badformat();
200	}
201
202	/* convert broken-down time to UTC clock time */
203	if ((tval = mktime(lt)) == -1)
204		badtime();
205
206	/* set the time */
207	if (nflag || netsettime(tval)) {
208		logwtmp("|", "date", "");
209		tv.tv_sec = tval;
210		tv.tv_usec = 0;
211		if (settimeofday(&tv, NULL)) {
212			perror("date: settimeofday");
213			exit(1);
214		}
215		logwtmp("{", "date", "");
216	}
217
218	if ((p = getlogin()) == NULL)
219		p = "???";
220	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
221}
222
223static void
224badformat()
225{
226	warnx("illegal time format");
227	usage();
228}
229
230static void
231badtime()
232{
233	errx(1, "illegal time");
234}
235
236static void
237usage()
238{
239	(void)fprintf(stderr,
240	    "usage: date [-nu] [-r seconds] [+format]\n");
241	(void)fprintf(stderr, "       date [[[[[cc]yy]mm]dd]hh]mm[.ss]\n");
242	exit(1);
243	/* NOTREACHED */
244}
245