1 /*
2 * Copyright (c) 1985, 1987, 1988, 1993
3 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)date.c 8.2 (Berkeley) 4/28/95
30 * $FreeBSD: src/bin/date/date.c,v 1.47 2005/01/10 08:39:21 imp Exp $
31 */
32
33 #include <sys/param.h>
34 #include <sys/time.h>
35
36 #include <ctype.h>
37 #include <err.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <syslog.h>
42 #include <unistd.h>
43 #include <locale.h>
44 #include <libutil.h>
45 #include <utmpx.h>
46
47 #include "vary.h"
48
49 #ifndef TM_YEAR_BASE
50 #define TM_YEAR_BASE 1900
51 #endif
52
53 static time_t tval;
54
55 static void badformat(void);
56 static void setthetime(const char *, const char *, int);
57 static void usage(void);
58
59 static const struct iso8601_fmt {
60 const char *refname;
61 const char *format;
62 } iso8601_fmts[] = {
63 { "date", "%Y-%m-%d" },
64 { "hours", "%Y-%m-%dT%H" },
65 { "minutes", "%Y-%m-%dT%H:%M" },
66 { "seconds", "%Y-%m-%dT%H:%M:%S" },
67 };
68 static const struct iso8601_fmt *iso8601_selected;
69
70 static const char *rfc2822_format = "%a, %d %b %Y %T %z";
71
72 int
main(int argc,char ** argv)73 main(int argc, char **argv)
74 {
75 int ch, rflag;
76 int Iflag, jflag, Rflag;
77 const char *format;
78 char buf[1024], tzbuf[8];
79 char *fmt;
80 char *tmp;
81 struct vary *v;
82 const struct vary *badv;
83 struct tm lt;
84 size_t i;
85
86 v = NULL;
87 fmt = NULL;
88 setlocale(LC_TIME, "");
89 rflag = 0;
90 Iflag = jflag = Rflag = 0;
91 while ((ch = getopt(argc, argv, "d:f:I::jnRr:uv:")) != -1) {
92 switch (ch) {
93 case 'f':
94 fmt = optarg;
95 break;
96 case 'I': /* ISO 8601 datetime format */
97 if (Rflag)
98 errx(1, "multiple output formats specified");
99 Iflag = 1;
100 if (optarg == NULL) {
101 iso8601_selected = iso8601_fmts;
102 break;
103 }
104 for (i = 0; i < nitems(iso8601_fmts); i++) {
105 if (strncmp(optarg, iso8601_fmts[i].refname,
106 strlen(optarg)) == 0)
107 break;
108 }
109 if (i == nitems(iso8601_fmts))
110 errx(1, "invalid argument '%s' for -I", optarg);
111 iso8601_selected = &iso8601_fmts[i];
112 break;
113 case 'j':
114 jflag = 1; /* don't set time */
115 break;
116 case 'n': /* don't set network */
117 break;
118 case 'R': /* RFC 2822 datetime format */
119 if (Iflag)
120 errx(1, "multiple output formats specified");
121 Rflag = 1;
122 break;
123 case 'r': /* user specified seconds */
124 rflag = 1;
125 tval = strtoll(optarg, &tmp, 0);
126 if (*tmp != 0)
127 usage();
128 break;
129 case 'u': /* do everything in UTC */
130 if (setenv("TZ", "UTC0", 1) != 0)
131 err(1, "setenv: cannot set TZ=UTC0");
132 break;
133 case 'd':
134 case 'v':
135 if (strncmp(optarg, "TZ=", 3) == 0) {
136 tmp = strdup(optarg);
137 size_t tzlen;
138
139 for (tzlen = 0; !isspace(tmp[tzlen]); ++tzlen)
140 ;
141 if (tmp[0] == '"' && tmp[tzlen - 1] == '"') {
142 tmp[tzlen - 1] = 0;
143 setenv("TZ", tmp + 1, 1);
144 } else {
145 tmp[tzlen] = 0;
146 setenv("TZ", tmp, 1);
147 }
148 while (isspace(tmp[tzlen]))
149 ++tzlen;
150 if (tmp[tzlen])
151 v = vary_append(v, optarg + tzlen);
152 } else {
153 v = vary_append(v, optarg);
154 }
155 break;
156 default:
157 usage();
158 }
159 }
160 argc -= optind;
161 argv += optind;
162
163 if (!rflag && time(&tval) == -1)
164 err(1, "time");
165
166 format = "%+";
167
168 if (Rflag)
169 format = rfc2822_format;
170 if (Iflag)
171 format = iso8601_selected->format;
172
173 /* allow the operands in any order */
174 if (*argv && **argv == '+') {
175 if (Iflag || Rflag)
176 errx(1, "multiple output formats specified");
177 format = *argv + 1;
178 ++argv;
179 }
180
181 if (*argv) {
182 setthetime(fmt, *argv, jflag);
183 ++argv;
184 } else if (fmt != NULL)
185 usage();
186
187 if (*argv && **argv == '+') {
188 if (Iflag || Rflag)
189 errx(1, "multiple output formats specified");
190 format = *argv + 1;
191 }
192
193 badv = vary_apply(v, tval, <);
194 if (badv) {
195 fprintf(stderr, "%s: Cannot apply date adjustment\n",
196 badv->arg);
197 vary_destroy(v);
198 usage();
199 }
200 vary_destroy(v);
201
202 if (format == rfc2822_format) {
203 /*
204 * When using RFC 2822 datetime format, don't honor the
205 * locale.
206 */
207 setlocale(LC_TIME, "C");
208 }
209
210 strftime(buf, sizeof(buf), format, <);
211 if (Iflag && iso8601_selected > iso8601_fmts) {
212 strftime(tzbuf, sizeof(tzbuf), "%z", <);
213 memmove(&tzbuf[4], &tzbuf[3], 3);
214 tzbuf[3] = ':';
215 strlcat(buf, tzbuf, sizeof(buf));
216 }
217 printf("%s\n", buf);
218 if (fflush(stdout) != 0)
219 err(1, "stdout");
220 exit(EXIT_SUCCESS);
221 }
222
223 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
224
225 static void
setthetime(const char * fmt,const char * p,int jflag)226 setthetime(const char *fmt, const char *p, int jflag)
227 {
228 struct tm *lt;
229 struct timeval tv;
230 const char *dot, *t;
231 int century;
232
233 if (fmt != NULL) {
234 lt = localtime(&tval);
235 t = strptime(p, fmt, lt);
236 if (t == NULL) {
237 fprintf(stderr, "Failed conversion of ``%s''"
238 " using format ``%s''\n", p, fmt);
239 badformat();
240 } else if (*t != '\0')
241 fprintf(stderr, "Warning: Ignoring %ld extraneous"
242 " characters in date string (%s)\n",
243 (long) strlen(t), t);
244 } else {
245 for (t = p, dot = NULL; *t; ++t) {
246 if (isdigit(*t))
247 continue;
248 if (*t == '.' && dot == NULL) {
249 dot = t;
250 continue;
251 }
252 badformat();
253 }
254
255 lt = localtime(&tval);
256
257 if (dot != NULL) { /* .ss */
258 dot++; /* *dot++ = '\0'; */
259 if (strlen(dot) != 2)
260 badformat();
261 lt->tm_sec = ATOI2(dot);
262 if (lt->tm_sec > 61)
263 badformat();
264 } else
265 lt->tm_sec = 0;
266
267 century = 0;
268 /* if p has a ".ss" field then let's pretend it's not there */
269 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
270 case 12: /* cc */
271 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
272 century = 1;
273 /* FALLTHROUGH */
274 case 10: /* yy */
275 if (century)
276 lt->tm_year += ATOI2(p);
277 else { /* hack for 2000 ;-} */
278 lt->tm_year = ATOI2(p);
279 if (lt->tm_year < 69)
280 lt->tm_year += 2000 - TM_YEAR_BASE;
281 else
282 lt->tm_year += 1900 - TM_YEAR_BASE;
283 }
284 /* FALLTHROUGH */
285 case 8: /* mm */
286 lt->tm_mon = ATOI2(p);
287 if (lt->tm_mon > 12)
288 badformat();
289 --lt->tm_mon; /* time struct is 0 - 11 */
290 /* FALLTHROUGH */
291 case 6: /* dd */
292 lt->tm_mday = ATOI2(p);
293 if (lt->tm_mday > 31)
294 badformat();
295 /* FALLTHROUGH */
296 case 4: /* HH */
297 lt->tm_hour = ATOI2(p);
298 if (lt->tm_hour > 23)
299 badformat();
300 /* FALLTHROUGH */
301 case 2: /* MM */
302 lt->tm_min = ATOI2(p);
303 if (lt->tm_min > 59)
304 badformat();
305 break;
306 default:
307 badformat();
308 }
309 }
310
311 /* Let mktime() decide whether summer time is in effect. */
312 lt->tm_isdst = -1;
313
314 /* convert broken-down time to GMT clock time */
315 if ((tval = mktime(lt)) == -1)
316 errx(1, "nonexistent time");
317
318 if (!jflag) {
319 logwtmpx("|", "date", "", 0, OLD_TIME);
320 tv.tv_sec = tval;
321 tv.tv_usec = 0;
322 if (settimeofday(&tv, NULL))
323 err(1, "settimeofday (timeval)");
324 logwtmpx("{", "date", "", 0, NEW_TIME);
325
326 if ((p = getlogin()) == NULL)
327 p = "???";
328 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
329 }
330 }
331
332 static void
badformat(void)333 badformat(void)
334 {
335 warnx("illegal time format");
336 usage();
337 }
338
339 static void
usage(void)340 usage(void)
341 {
342 fprintf(stderr, "%s\n%s\n",
343 "usage: date [-jnRu] [-r seconds] [-v[+|-]val[ymwdHMS]] ... ",
344 " "
345 "[-I [date | hours | minutes | seconds]]"
346 " "
347 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
348 exit(1);
349 }
350