1 /*
2 * Copyright (c) 1985, 1987, 1988 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #ifndef lint
35 char copyright[] =
36 "@(#) Copyright (c) 1985, 1987, 1988 The Regents of the University of California.\n\
37 All rights reserved.\n";
38 #endif /* not lint */
39
40 #ifndef lint
41 static char rcsid[] = "$Id$";
42 #endif /* not lint */
43
44 #include <sys/param.h>
45 #include <sys/time.h>
46 #include <sys/file.h>
47 #include <syslog.h>
48 #include <unistd.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <ctype.h>
53
54 time_t tval;
55 int retval, nflag;
56
main(argc,argv)57 main(argc, argv)
58 int argc;
59 char **argv;
60 {
61 extern int optind;
62 extern char *optarg;
63 struct timezone tz;
64 int ch, rflag;
65 char *format, buf[1024];
66
67 tz.tz_dsttime = tz.tz_minuteswest = 0;
68 rflag = 0;
69 while ((ch = getopt(argc, argv, "d:nr:ut:")) != EOF)
70 switch((char)ch) {
71 case 'd': /* daylight savings time */
72 tz.tz_dsttime = atoi(optarg) ? 1 : 0;
73 break;
74 case 'n': /* don't set network */
75 nflag = 1;
76 break;
77 case 'r': /* user specified seconds */
78 rflag = 1;
79 tval = atol(optarg);
80 break;
81 case 'u': /* do everything in GMT */
82 (void)setenv("TZ", "GMT0", 1);
83 break;
84 case 't': /* minutes west of GMT */
85 /* error check; don't allow "PST" */
86 if (isdigit(*optarg)) {
87 tz.tz_minuteswest = atoi(optarg);
88 break;
89 }
90 /* FALLTHROUGH */
91 default:
92 usage();
93 }
94 argc -= optind;
95 argv += optind;
96
97 /*
98 * If -d or -t, set the timezone or daylight savings time; this
99 * doesn't belong here, there kernel should not know about either.
100 */
101 if ((tz.tz_minuteswest || tz.tz_dsttime) &&
102 settimeofday((struct timeval *)NULL, &tz)) {
103 perror("date: settimeofday");
104 exit(1);
105 }
106
107 if (!rflag && time(&tval) == -1) {
108 perror("date: time");
109 exit(1);
110 }
111
112 format = "%a %b %e %H:%M:%S %Z %Y%n";
113
114 /* allow the operands in any order */
115 if (*argv && **argv == '+') {
116 format = *argv + 1;
117 ++argv;
118 }
119
120 if (*argv) {
121 setthetime(*argv);
122 setthetime(*argv); /* XXX: transitting TZ/dst boundary */
123 ++argv;
124 }
125
126 if (*argv && **argv == '+')
127 format = *argv + 1;
128
129 (void)strftime(buf, sizeof(buf), format, localtime(&tval));
130 (void)printf("%s", buf);
131 exit(retval);
132 }
133
134 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
setthetime(p)135 setthetime(p)
136 register char *p;
137 {
138 register struct tm *lt;
139 struct timeval tv;
140 int dot, cent = 0;
141 char *t;
142
143 for (t = p, dot = 0; *t; ++t)
144 if (!isdigit(*t) && (*t != '.' || dot++))
145 badformat();
146
147 lt = localtime(&tval);
148
149 if (t = index(p, '.')) { /* .ss */
150 *t++ = '\0';
151 lt->tm_sec = ATOI2(t);
152 if (lt->tm_sec > 61)
153 badformat();
154 } else
155 lt->tm_sec = 0;
156
157 for (t = p; *t; ++t)
158 if (!isdigit(*t))
159 badformat();
160
161 switch (strlen(p)) {
162 case 12: /* cc */
163 cent = ATOI2(p);
164 cent = cent*100 - 1900;
165 /* FALLTHROUGH */
166 case 10: /* yy */
167 lt->tm_year = ATOI2(p);
168 lt->tm_year += cent;
169 /* FALLTHROUGH */
170 case 8: /* mm */
171 lt->tm_mon = ATOI2(p);
172 if (lt->tm_mon > 12)
173 badformat();
174 --lt->tm_mon; /* time struct is 0 - 11 */
175 /* FALLTHROUGH */
176 case 6: /* dd */
177 lt->tm_mday = ATOI2(p);
178 if (lt->tm_mday > 31)
179 badformat();
180 /* FALLTHROUGH */
181 case 4: /* hh */
182 lt->tm_hour = ATOI2(p);
183 if (lt->tm_hour > 23)
184 badformat();
185 /* FALLTHROUGH */
186 case 2: /* mm */
187 lt->tm_min = ATOI2(p);
188 if (lt->tm_min > 59)
189 badformat();
190 break;
191 default:
192 badformat();
193 }
194
195 /* convert broken-down time to GMT clock time */
196 if ((tval = mktime(lt)) == -1)
197 badformat();
198
199 if (!(p = getlogin())) /* single-user or no tty */
200 p = "root";
201 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
202
203 /* set the time */
204 if (nflag || netsettime(tval)) {
205 logwtmp("|", "date", "");
206 tv.tv_sec = tval;
207 tv.tv_usec = 0;
208 if (settimeofday(&tv, (struct timezone *)NULL)) {
209 perror("date: settimeofday");
210 exit(1);
211 }
212 logwtmp("{", "date", "");
213 }
214 }
215
badformat()216 badformat()
217 {
218 (void)fprintf(stderr, "date: illegal time format.\n");
219 usage();
220 }
221
usage()222 usage()
223 {
224 (void)fprintf(stderr,
225 "usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]\n");
226 (void)fprintf(stderr, " [[[[[CC]YY]MM]DD]HH]MM[.ss]\n");
227 exit(1);
228 }
229