1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static char const copyright[] =
34 "@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
41 #endif /* not lint */
42 #endif
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
46
47 #include <sys/param.h>
48 #include <sys/time.h>
49 #include <sys/stat.h>
50
51 #include <ctype.h>
52 #include <err.h>
53 #include <locale.h>
54 #include <stdbool.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <syslog.h>
59 #include <unistd.h>
60 #include <utmpx.h>
61
62 #include "vary.h"
63
64 #ifndef TM_YEAR_BASE
65 #define TM_YEAR_BASE 1900
66 #endif
67
68 static time_t tval;
69
70 static void badformat(void);
71 static void iso8601_usage(const char *);
72 static void multipleformats(void);
73 static void printdate(const char *);
74 static void printisodate(struct tm *);
75 static void setthetime(const char *, const char *, int);
76 static void usage(void);
77
78 static const struct iso8601_fmt {
79 const char *refname;
80 const char *format_string;
81 } iso8601_fmts[] = {
82 { "date", "%Y-%m-%d" },
83 { "hours", "T%H" },
84 { "minutes", ":%M" },
85 { "seconds", ":%S" },
86 };
87 static const struct iso8601_fmt *iso8601_selected;
88
89 static const char *rfc2822_format = "%a, %d %b %Y %T %z";
90
91 int
main(int argc,char * argv[])92 main(int argc, char *argv[])
93 {
94 int ch, rflag;
95 bool Iflag, jflag, Rflag;
96 const char *format;
97 char buf[1024];
98 char *fmt;
99 char *tmp;
100 struct vary *v;
101 const struct vary *badv;
102 struct tm *lt;
103 struct stat sb;
104 size_t i;
105
106 v = NULL;
107 fmt = NULL;
108 (void) setlocale(LC_TIME, "");
109 rflag = 0;
110 Iflag = jflag = Rflag = 0;
111 while ((ch = getopt(argc, argv, "f:I::jnRr:uv:")) != -1)
112 switch((char)ch) {
113 case 'f':
114 fmt = optarg;
115 break;
116 case 'I':
117 if (Rflag)
118 multipleformats();
119 Iflag = 1;
120 if (optarg == NULL) {
121 iso8601_selected = iso8601_fmts;
122 break;
123 }
124 for (i = 0; i < nitems(iso8601_fmts); i++)
125 if (strcmp(optarg, iso8601_fmts[i].refname) == 0)
126 break;
127 if (i == nitems(iso8601_fmts))
128 iso8601_usage(optarg);
129
130 iso8601_selected = &iso8601_fmts[i];
131 break;
132 case 'j':
133 jflag = 1; /* don't set time */
134 break;
135 case 'n':
136 break;
137 case 'R': /* RFC 2822 datetime format */
138 if (Iflag)
139 multipleformats();
140 Rflag = 1;
141 break;
142 case 'r': /* user specified seconds */
143 rflag = 1;
144 tval = strtoq(optarg, &tmp, 0);
145 if (*tmp != 0) {
146 if (stat(optarg, &sb) == 0)
147 tval = sb.st_mtim.tv_sec;
148 else
149 usage();
150 }
151 break;
152 case 'u': /* do everything in UTC */
153 (void)setenv("TZ", "UTC0", 1);
154 break;
155 case 'v':
156 v = vary_append(v, optarg);
157 break;
158 default:
159 usage();
160 }
161 argc -= optind;
162 argv += optind;
163
164 if (!rflag && time(&tval) == -1)
165 err(1, "time");
166
167 format = "%+";
168
169 if (Rflag)
170 format = rfc2822_format;
171
172 /* allow the operands in any order */
173 if (*argv && **argv == '+') {
174 if (Iflag)
175 multipleformats();
176 format = *argv + 1;
177 ++argv;
178 }
179
180 if (*argv) {
181 setthetime(fmt, *argv, jflag);
182 ++argv;
183 } else if (fmt != NULL)
184 usage();
185
186 if (*argv && **argv == '+') {
187 if (Iflag)
188 multipleformats();
189 format = *argv + 1;
190 }
191
192 lt = localtime(&tval);
193 if (lt == NULL)
194 errx(1, "invalid time");
195 badv = vary_apply(v, lt);
196 if (badv) {
197 fprintf(stderr, "%s: Cannot apply date adjustment\n",
198 badv->arg);
199 vary_destroy(v);
200 usage();
201 }
202 vary_destroy(v);
203
204 if (Iflag)
205 printisodate(lt);
206
207 if (format == rfc2822_format)
208 /*
209 * When using RFC 2822 datetime format, don't honor the
210 * locale.
211 */
212 setlocale(LC_TIME, "C");
213
214 (void)strftime(buf, sizeof(buf), format, lt);
215 printdate(buf);
216 }
217
218 static void
printdate(const char * buf)219 printdate(const char *buf)
220 {
221 (void)printf("%s\n", buf);
222 if (fflush(stdout))
223 err(1, "stdout");
224 exit(EXIT_SUCCESS);
225 }
226
227 static void
printisodate(struct tm * lt)228 printisodate(struct tm *lt)
229 {
230 const struct iso8601_fmt *it;
231 char fmtbuf[32], buf[32], tzbuf[8];
232
233 fmtbuf[0] = 0;
234 for (it = iso8601_fmts; it <= iso8601_selected; it++)
235 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf));
236
237 (void)strftime(buf, sizeof(buf), fmtbuf, lt);
238
239 if (iso8601_selected > iso8601_fmts) {
240 (void)strftime(tzbuf, sizeof(tzbuf), "%z", lt);
241 memmove(&tzbuf[4], &tzbuf[3], 3);
242 tzbuf[3] = ':';
243 strlcat(buf, tzbuf, sizeof(buf));
244 }
245
246 printdate(buf);
247 }
248
249 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
250
251 static void
setthetime(const char * fmt,const char * p,int jflag)252 setthetime(const char *fmt, const char *p, int jflag)
253 {
254 struct utmpx utx;
255 struct tm *lt;
256 struct timeval tv;
257 const char *dot, *t;
258 int century;
259
260 lt = localtime(&tval);
261 if (lt == NULL)
262 errx(1, "invalid time");
263 lt->tm_isdst = -1; /* divine correct DST */
264
265 if (fmt != NULL) {
266 t = strptime(p, fmt, lt);
267 if (t == NULL) {
268 fprintf(stderr, "Failed conversion of ``%s''"
269 " using format ``%s''\n", p, fmt);
270 badformat();
271 } else if (*t != '\0')
272 fprintf(stderr, "Warning: Ignoring %ld extraneous"
273 " characters in date string (%s)\n",
274 (long) strlen(t), t);
275 } else {
276 for (t = p, dot = NULL; *t; ++t) {
277 if (isdigit(*t))
278 continue;
279 if (*t == '.' && dot == NULL) {
280 dot = t;
281 continue;
282 }
283 badformat();
284 }
285
286 if (dot != NULL) { /* .ss */
287 dot++; /* *dot++ = '\0'; */
288 if (strlen(dot) != 2)
289 badformat();
290 lt->tm_sec = ATOI2(dot);
291 if (lt->tm_sec > 61)
292 badformat();
293 } else
294 lt->tm_sec = 0;
295
296 century = 0;
297 /* if p has a ".ss" field then let's pretend it's not there */
298 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
299 case 12: /* cc */
300 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
301 century = 1;
302 /* FALLTHROUGH */
303 case 10: /* yy */
304 if (century)
305 lt->tm_year += ATOI2(p);
306 else {
307 lt->tm_year = ATOI2(p);
308 if (lt->tm_year < 69) /* hack for 2000 ;-} */
309 lt->tm_year += 2000 - TM_YEAR_BASE;
310 else
311 lt->tm_year += 1900 - TM_YEAR_BASE;
312 }
313 /* FALLTHROUGH */
314 case 8: /* mm */
315 lt->tm_mon = ATOI2(p);
316 if (lt->tm_mon > 12)
317 badformat();
318 --lt->tm_mon; /* time struct is 0 - 11 */
319 /* FALLTHROUGH */
320 case 6: /* dd */
321 lt->tm_mday = ATOI2(p);
322 if (lt->tm_mday > 31)
323 badformat();
324 /* FALLTHROUGH */
325 case 4: /* HH */
326 lt->tm_hour = ATOI2(p);
327 if (lt->tm_hour > 23)
328 badformat();
329 /* FALLTHROUGH */
330 case 2: /* MM */
331 lt->tm_min = ATOI2(p);
332 if (lt->tm_min > 59)
333 badformat();
334 break;
335 default:
336 badformat();
337 }
338 }
339
340 /* convert broken-down time to GMT clock time */
341 if ((tval = mktime(lt)) == -1)
342 errx(1, "nonexistent time");
343
344 if (!jflag) {
345 utx.ut_type = OLD_TIME;
346 memset(utx.ut_id, 0, sizeof(utx.ut_id));
347 (void)gettimeofday(&utx.ut_tv, NULL);
348 pututxline(&utx);
349 tv.tv_sec = tval;
350 tv.tv_usec = 0;
351 if (settimeofday(&tv, NULL) != 0)
352 err(1, "settimeofday (timeval)");
353 utx.ut_type = NEW_TIME;
354 (void)gettimeofday(&utx.ut_tv, NULL);
355 pututxline(&utx);
356
357 if ((p = getlogin()) == NULL)
358 p = "???";
359 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
360 }
361 }
362
363 static void
badformat(void)364 badformat(void)
365 {
366 warnx("illegal time format");
367 usage();
368 }
369
370 static void
iso8601_usage(const char * badarg)371 iso8601_usage(const char *badarg)
372 {
373 errx(1, "invalid argument '%s' for -I", badarg);
374 }
375
376 static void
multipleformats(void)377 multipleformats(void)
378 {
379 errx(1, "multiple output formats specified");
380 }
381
382 static void
usage(void)383 usage(void)
384 {
385 (void)fprintf(stderr, "%s\n%s\n%s\n",
386 "usage: date [-jnRu] [-I[date|hours|minutes|seconds]] [-f input_fmt]",
387 " "
388 "[-r filename|seconds] [-v[+|-]val[y|m|w|d|H|M|S]]",
389 " "
390 "[[[[[[cc]yy]mm]dd]HH]MM[.SS] | new_date] [+output_fmt]"
391 );
392 exit(1);
393 }
394