GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: bin/date/date.c Lines: 25 118 21.2 %
Date: 2017-11-13 Branches: 14 87 16.1 %

Line Branch Exec Source
1
/*	$OpenBSD: date.c,v 1.50 2016/10/19 18:20:25 schwarze Exp $	*/
2
/*	$NetBSD: date.c,v 1.11 1995/09/07 06:21:05 jtc Exp $	*/
3
4
/*
5
 * Copyright (c) 1985, 1987, 1988, 1993
6
 *	The Regents of the University of California.  All rights reserved.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions
10
 * are met:
11
 * 1. Redistributions of source code must retain the above copyright
12
 *    notice, this list of conditions and the following disclaimer.
13
 * 2. Redistributions in binary form must reproduce the above copyright
14
 *    notice, this list of conditions and the following disclaimer in the
15
 *    documentation and/or other materials provided with the distribution.
16
 * 3. Neither the name of the University nor the names of its contributors
17
 *    may be used to endorse or promote products derived from this software
18
 *    without specific prior written permission.
19
 *
20
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30
 * SUCH DAMAGE.
31
 */
32
33
#include <sys/types.h>
34
#include <sys/time.h>
35
36
#include <ctype.h>
37
#include <err.h>
38
#include <fcntl.h>
39
#include <stdio.h>
40
#include <stdlib.h>
41
#include <string.h>
42
#include <syslog.h>
43
#include <time.h>
44
#include <unistd.h>
45
#include <util.h>
46
47
extern	char *__progname;
48
49
time_t tval;
50
int jflag;
51
int slidetime;
52
53
static void setthetime(char *);
54
static void badformat(void);
55
static void __dead usage(void);
56
57
int
58
main(int argc, char *argv[])
59
{
60
222
	struct timezone tz;
61
111
	const char *errstr;
62
	struct tm *tp;
63
	int ch, rflag;
64
111
	char *format, buf[1024], *outzone = NULL;
65
66
111
	tz.tz_dsttime = tz.tz_minuteswest = 0;
67
	rflag = 0;
68
222
	while ((ch = getopt(argc, argv, "ad:jr:ut:z:")) != -1)
69
		switch(ch) {
70
		case 'd':		/* daylight saving time */
71
			tz.tz_dsttime = atoi(optarg) ? 1 : 0;
72
			break;
73
		case 'a':
74
			slidetime = 1;
75
			break;
76
		case 'j':		/* don't set */
77
			jflag = 1;
78
			break;
79
		case 'r':		/* user specified seconds */
80
			rflag = 1;
81
			tval = atoll(optarg);
82
			break;
83
		case 'u':		/* do everything in UTC */
84
			if (setenv("TZ", "UTC", 1) == -1)
85
				err(1, "cannot unsetenv TZ");
86
			break;
87
		case 't':		/* minutes west of GMT */
88
			tz.tz_minuteswest = strtonum(optarg, 0, 24*60-1, &errstr);
89
			if (errstr)
90
				errx(1, "-t %s: %s", optarg, errstr);
91
			break;
92
		case 'z':
93
			outzone = optarg;
94
			break;
95
		default:
96
			usage();
97
		}
98
111
	argc -= optind;
99
111
	argv += optind;
100
101
	/*
102
	 * If -d or -t, set the timezone or daylight saving time; this
103
	 * doesn't belong here, the kernel should not know about either.
104
	 */
105

222
	if ((tz.tz_minuteswest || tz.tz_dsttime) &&
106
	    settimeofday(NULL, &tz))
107
		err(1, "settimeofday");
108
109

222
	if (!rflag && time(&tval) == -1)
110
		err(1, "time");
111
112
	format = "%a %b %e %H:%M:%S %Z %Y";
113
114
	/* allow the operands in any order */
115

199
	if (*argv && **argv == '+') {
116
88
		format = *argv + 1;
117
88
		argv++;
118
88
		argc--;
119
88
	}
120
121
111
	if (*argv) {
122
		setthetime(*argv);
123
		argv++;
124
		argc--;
125
	}
126
127
111
	if (pledge("stdio rpath wpath flock cpath", NULL) == -1)
128
		err(1, "pledge");
129
130

111
	if (*argv && **argv == '+') {
131
		format = *argv + 1;
132
		argc--;
133
	}
134
135
111
	if (argc > 0)
136
		errx(1, "too many arguments");
137
138
111
	if (outzone)
139
		setenv("TZ", outzone, 1);
140
141
111
	tp = localtime(&tval);
142
111
	if (tp == NULL)
143
		errx(1, "conversion error");
144
111
	(void)strftime(buf, sizeof(buf), format, tp);
145
111
	(void)printf("%s\n", buf);
146
111
	return 0;
147
111
}
148
149
#define	ATOI2(ar)	((ar) += 2, ((ar)[-2] - '0') * 10 + ((ar)[-1] - '0'))
150
void
151
setthetime(char *p)
152
{
153
	struct tm *lt;
154
	struct timeval tv;
155
	char *dot, *t;
156
	int yearset = 0;
157
158
	for (t = p, dot = NULL; *t; ++t) {
159
		if (isdigit((unsigned char)*t))
160
			continue;
161
		if (*t == '.' && dot == NULL) {
162
			dot = t;
163
			continue;
164
		}
165
		badformat();
166
	}
167
168
	lt = localtime(&tval);
169
170
	lt->tm_isdst = -1;			/* correct for DST */
171
172
	if (dot != NULL) {			/* .SS */
173
		*dot++ = '\0';
174
		if (strlen(dot) != 2)
175
			badformat();
176
		lt->tm_sec = ATOI2(dot);
177
		if (lt->tm_sec > 61)
178
			badformat();
179
	} else
180
		lt->tm_sec = 0;
181
182
	switch (strlen(p)) {
183
	case 12:				/* cc */
184
		lt->tm_year = (ATOI2(p) * 100) - 1900;
185
		yearset = 1;
186
		/* FALLTHROUGH */
187
	case 10:				/* yy */
188
		if (!yearset) {
189
			/* mask out current year, leaving only century */
190
			lt->tm_year = ((lt->tm_year / 100) * 100);
191
		}
192
		lt->tm_year += ATOI2(p);
193
		/* FALLTHROUGH */
194
	case 8:					/* mm */
195
		lt->tm_mon = ATOI2(p);
196
		if ((lt->tm_mon > 12) || !lt->tm_mon)
197
			badformat();
198
		--lt->tm_mon;			/* time struct is 0 - 11 */
199
		/* FALLTHROUGH */
200
	case 6:					/* dd */
201
		lt->tm_mday = ATOI2(p);
202
		if ((lt->tm_mday > 31) || !lt->tm_mday)
203
			badformat();
204
		/* FALLTHROUGH */
205
	case 4:					/* HH */
206
		lt->tm_hour = ATOI2(p);
207
		if (lt->tm_hour > 23)
208
			badformat();
209
		/* FALLTHROUGH */
210
	case 2:					/* MM */
211
		lt->tm_min = ATOI2(p);
212
		if (lt->tm_min > 59)
213
			badformat();
214
		break;
215
	default:
216
		badformat();
217
	}
218
219
	/* convert broken-down time to UTC clock time */
220
	if ((tval = mktime(lt)) < 0)
221
		errx(1, "specified date is outside allowed range");
222
223
	if (jflag)
224
		return;
225
226
	/* set the time */
227
	if (slidetime) {
228
		struct timeval tv_current;
229
230
		if (gettimeofday(&tv_current, NULL) == -1)
231
			err(1, "Could not get local time of day");
232
233
		tv.tv_sec = tval - tv_current.tv_sec;
234
		tv.tv_usec = 0;
235
		if (adjtime(&tv, NULL) == -1)
236
			errx(1, "adjtime");
237
	} else {
238
#ifndef SMALL
239
		logwtmp("|", "date", "");
240
#endif
241
		tv.tv_sec = tval;
242
		tv.tv_usec = 0;
243
		if (settimeofday(&tv, NULL))
244
			err(1, "settimeofday");
245
#ifndef SMALL
246
		logwtmp("{", "date", "");
247
#endif
248
	}
249
250
	if ((p = getlogin()) == NULL)
251
		p = "???";
252
	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
253
}
254
255
static void
256
badformat(void)
257
{
258
	warnx("illegal time format");
259
	usage();
260
}
261
262
static void __dead
263
usage(void)
264
{
265
	(void)fprintf(stderr,
266
	    "usage: %s [-aju] [-d dst] [-r seconds] [-t minutes_west] [-z output_zone]\n",
267
	     __progname);
268
	(void)fprintf(stderr,
269
	    "%-*s[+format] [[[[[[cc]yy]mm]dd]HH]MM[.SS]]\n", (int)strlen(__progname) + 8, "");
270
	exit(1);
271
}