date.c revision 1.23 
1/*	$NetBSD: date.c,v 1.23 1998/07/27 16:43:25 mycroft 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 1.23 1998/07/27 16:43:25 mycroft 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 usage __P((void));
76
77int
78main(argc, argv)
79	int argc;
80	char *argv[];
81{
82	extern int optind;
83	extern char *optarg;
84	int ch, rflag;
85	char *format, buf[1024];
86
87	(void)setlocale(LC_ALL, "");
88
89	rflag = 0;
90	while ((ch = getopt(argc, argv, "nr:u")) != -1)
91		switch((char)ch) {
92		case 'n':		/* don't set network */
93			nflag = 1;
94			break;
95		case 'r':		/* user specified seconds */
96			rflag = 1;
97			tval = atol(optarg);
98			break;
99		case 'u':		/* do everything in GMT */
100			(void)setenv("TZ", "GMT0", 1);
101			break;
102		default:
103			usage();
104		}
105	argc -= optind;
106	argv += optind;
107
108	if (!rflag && time(&tval) == -1)
109		err(1, "time");
110
111	format = "%a %b %e %H:%M:%S %Z %Y";
112
113	/* allow the operands in any order */
114	if (*argv && **argv == '+') {
115		format = *argv + 1;
116		++argv;
117	}
118
119	if (*argv) {
120		setthetime(*argv);
121		++argv;
122	}
123
124	if (*argv && **argv == '+')
125		format = *argv + 1;
126
127	(void)strftime(buf, sizeof(buf), format, localtime(&tval));
128	(void)printf("%s\n", buf);
129	exit(retval);
130	/* NOTREACHED */
131}
132
133#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
134
135void
136setthetime(p)
137	const char *p;
138{
139	struct tm *lt;
140	struct timeval tv;
141	const char *dot, *t;
142	int yearset, len;
143
144	for (t = p, dot = NULL; *t; ++t) {
145		if (isdigit(*t))
146			continue;
147		if (*t == '.' && dot == NULL) {
148			dot = t;
149			continue;
150		}
151		badformat();
152	}
153
154	lt = localtime(&tval);
155
156	if (dot != NULL) {			/* .ss */
157		len = strlen(dot);
158		if (len != 3)
159			badformat();
160		++dot;
161		lt->tm_sec = ATOI2(dot);
162	} else {
163		len = 0;
164		lt->tm_sec = 0;
165	}
166
167	yearset = 0;
168	switch (strlen(p) - len) {
169	case 12:				/* cc */
170		lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
171		yearset = 1;
172		/* FALLTHROUGH */
173	case 10:				/* yy */
174		if (yearset) {
175			lt->tm_year += ATOI2(p);
176		} else {
177			yearset = ATOI2(p);
178			if (yearset < 69)
179				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
180			else
181				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
182		}
183		/* FALLTHROUGH */
184	case 8:					/* mm */
185		lt->tm_mon = ATOI2(p);
186		--lt->tm_mon;			/* time struct is 0 - 11 */
187		/* FALLTHROUGH */
188	case 6:					/* dd */
189		lt->tm_mday = ATOI2(p);
190		/* FALLTHROUGH */
191	case 4:					/* hh */
192		lt->tm_hour = ATOI2(p);
193		/* FALLTHROUGH */
194	case 2:					/* mm */
195		lt->tm_min = ATOI2(p);
196		break;
197	default:
198		badformat();
199	}
200
201	/* convert broken-down time to GMT clock time */
202	if ((tval = mktime(lt)) == -1)
203		badformat();
204
205	/* set the time */
206	if (nflag || netsettime(tval)) {
207		logwtmp("|", "date", "");
208		tv.tv_sec = tval;
209		tv.tv_usec = 0;
210		if (settimeofday(&tv, NULL)) {
211			perror("date: settimeofday");
212			exit(1);
213		}
214		logwtmp("{", "date", "");
215	}
216
217	if ((p = getlogin()) == NULL)
218		p = "???";
219	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
220}
221
222static void
223badformat()
224{
225	warnx("illegal time format");
226	usage();
227}
228
229static void
230usage()
231{
232	(void)fprintf(stderr,
233	    "usage: date [-nu] [-r seconds] [+format]\n");
234	(void)fprintf(stderr, "       date [[[[[cc]yy]mm]dd]hh]mm[.ss]\n");
235	exit(1);
236}
237