date.c revision 1.15.2.1 
1/*	$NetBSD: date.c,v 1.15.2.1 1998/01/29 11:04:50 mellon 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 1.15.2.1 1998/01/29 11:04:50 mellon 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(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
133
134void
135setthetime(p)
136	char *p;
137{
138	struct tm *lt;
139	struct timeval tv;
140	char *dot, *t;
141	int yearset;
142
143	for (t = p, dot = NULL; *t; ++t) {
144		if (isdigit(*t))
145			continue;
146		if (*t == '.' && dot == NULL) {
147			dot = t;
148			continue;
149		}
150		badformat();
151	}
152
153	lt = localtime(&tval);
154
155	if (dot != NULL) {			/* .ss */
156		*dot++ = '\0';
157		if (strlen(dot) != 2)
158			badformat();
159		lt->tm_sec = ATOI2(dot);
160	} else
161		lt->tm_sec = 0;
162
163	yearset = 0;
164	switch (strlen(p)) {
165	case 12:				/* cc */
166		lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
167		yearset = 1;
168		/* FALLTHROUGH */
169	case 10:				/* yy */
170		if (yearset) {
171			lt->tm_year += ATOI2(p);
172		} else {
173			yearset = ATOI2(p);
174			if (yearset < 69)
175				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
176			else
177				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
178		}
179		/* FALLTHROUGH */
180	case 8:					/* mm */
181		lt->tm_mon = ATOI2(p);
182		--lt->tm_mon;			/* time struct is 0 - 11 */
183		/* FALLTHROUGH */
184	case 6:					/* dd */
185		lt->tm_mday = ATOI2(p);
186		/* FALLTHROUGH */
187	case 4:					/* hh */
188		lt->tm_hour = ATOI2(p);
189		/* FALLTHROUGH */
190	case 2:					/* mm */
191		lt->tm_min = ATOI2(p);
192		break;
193	default:
194		badformat();
195	}
196
197	/* convert broken-down time to GMT clock time */
198	if ((tval = mktime(lt)) == -1)
199		badformat();
200
201	/* set the time */
202	if (nflag || netsettime(tval)) {
203		logwtmp("|", "date", "");
204		tv.tv_sec = tval;
205		tv.tv_usec = 0;
206		if (settimeofday(&tv, NULL)) {
207			perror("date: settimeofday");
208			exit(1);
209		}
210		logwtmp("{", "date", "");
211	}
212
213	if ((p = getlogin()) == NULL)
214		p = "???";
215	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
216}
217
218static void
219badformat()
220{
221	warnx("illegal time format");
222	usage();
223}
224
225static void
226usage()
227{
228	(void)fprintf(stderr,
229	    "usage: date [-nu] [-r seconds] [+format]\n");
230	(void)fprintf(stderr, "       date [[[[[cc]yy]mm]dd]hh]mm[.ss]\n");
231	exit(1);
232}
233