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 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, *outzone = NULL; 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:z:")) != -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 'z': 156 outzone = optarg; 157 break; 158 case 'v': 159 v = vary_append(v, optarg); 160 break; 161 default: 162 usage(); 163 } 164 argc -= optind; 165 argv += optind; 166 167 if (!rflag && time(&tval) == -1) 168 err(1, "time"); 169 170 format = "%+"; 171 172 if (Rflag) 173 format = rfc2822_format; 174 175 /* allow the operands in any order */ 176 if (*argv && **argv == '+') { 177 if (Iflag) 178 multipleformats(); 179 format = *argv + 1; 180 ++argv; 181 } 182 183 if (*argv) { 184 setthetime(fmt, *argv, jflag); 185 ++argv; 186 } else if (fmt != NULL) 187 usage(); 188 189 if (*argv && **argv == '+') { 190 if (Iflag) 191 multipleformats(); 192 format = *argv + 1; 193 } 194 195 if (outzone != NULL && setenv("TZ", outzone, 1) != 0) 196 err(1, "setenv(TZ)"); 197 lt = localtime(&tval); 198 if (lt == NULL) 199 errx(1, "invalid time"); 200 badv = vary_apply(v, lt); 201 if (badv) { 202 fprintf(stderr, "%s: Cannot apply date adjustment\n", 203 badv->arg); 204 vary_destroy(v); 205 usage(); 206 } 207 vary_destroy(v); 208 209 if (Iflag) 210 printisodate(lt); 211 212 if (format == rfc2822_format) 213 /* 214 * When using RFC 2822 datetime format, don't honor the 215 * locale. 216 */ 217 setlocale(LC_TIME, "C"); 218 219 220 (void)strftime(buf, sizeof(buf), format, lt); 221 printdate(buf); 222 } 223 224 static void 225 printdate(const char *buf) 226 { 227 (void)printf("%s\n", buf); 228 if (fflush(stdout)) 229 err(1, "stdout"); 230 exit(EXIT_SUCCESS); 231 } 232 233 static void 234 printisodate(struct tm *lt) 235 { 236 const struct iso8601_fmt *it; 237 char fmtbuf[32], buf[32], tzbuf[8]; 238 239 fmtbuf[0] = 0; 240 for (it = iso8601_fmts; it <= iso8601_selected; it++) 241 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf)); 242 243 (void)strftime(buf, sizeof(buf), fmtbuf, lt); 244 245 if (iso8601_selected > iso8601_fmts) { 246 (void)strftime(tzbuf, sizeof(tzbuf), "%z", lt); 247 memmove(&tzbuf[4], &tzbuf[3], 3); 248 tzbuf[3] = ':'; 249 strlcat(buf, tzbuf, sizeof(buf)); 250 } 251 252 printdate(buf); 253 } 254 255 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 256 257 static void 258 setthetime(const char *fmt, const char *p, int jflag) 259 { 260 struct utmpx utx; 261 struct tm *lt; 262 struct timeval tv; 263 const char *dot, *t; 264 int century; 265 266 lt = localtime(&tval); 267 if (lt == NULL) 268 errx(1, "invalid time"); 269 lt->tm_isdst = -1; /* divine correct DST */ 270 271 if (fmt != NULL) { 272 t = strptime(p, fmt, lt); 273 if (t == NULL) { 274 fprintf(stderr, "Failed conversion of ``%s''" 275 " using format ``%s''\n", p, fmt); 276 badformat(); 277 } else if (*t != '\0') 278 fprintf(stderr, "Warning: Ignoring %ld extraneous" 279 " characters in date string (%s)\n", 280 (long) strlen(t), t); 281 } else { 282 for (t = p, dot = NULL; *t; ++t) { 283 if (isdigit(*t)) 284 continue; 285 if (*t == '.' && dot == NULL) { 286 dot = t; 287 continue; 288 } 289 badformat(); 290 } 291 292 if (dot != NULL) { /* .ss */ 293 dot++; /* *dot++ = '\0'; */ 294 if (strlen(dot) != 2) 295 badformat(); 296 lt->tm_sec = ATOI2(dot); 297 if (lt->tm_sec > 61) 298 badformat(); 299 } else 300 lt->tm_sec = 0; 301 302 century = 0; 303 /* if p has a ".ss" field then let's pretend it's not there */ 304 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 305 case 12: /* cc */ 306 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 307 century = 1; 308 /* FALLTHROUGH */ 309 case 10: /* yy */ 310 if (century) 311 lt->tm_year += ATOI2(p); 312 else { 313 lt->tm_year = ATOI2(p); 314 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 315 lt->tm_year += 2000 - TM_YEAR_BASE; 316 else 317 lt->tm_year += 1900 - TM_YEAR_BASE; 318 } 319 /* FALLTHROUGH */ 320 case 8: /* mm */ 321 lt->tm_mon = ATOI2(p); 322 if (lt->tm_mon > 12) 323 badformat(); 324 --lt->tm_mon; /* time struct is 0 - 11 */ 325 /* FALLTHROUGH */ 326 case 6: /* dd */ 327 lt->tm_mday = ATOI2(p); 328 if (lt->tm_mday > 31) 329 badformat(); 330 /* FALLTHROUGH */ 331 case 4: /* HH */ 332 lt->tm_hour = ATOI2(p); 333 if (lt->tm_hour > 23) 334 badformat(); 335 /* FALLTHROUGH */ 336 case 2: /* MM */ 337 lt->tm_min = ATOI2(p); 338 if (lt->tm_min > 59) 339 badformat(); 340 break; 341 default: 342 badformat(); 343 } 344 } 345 346 /* convert broken-down time to GMT clock time */ 347 if ((tval = mktime(lt)) == -1) 348 errx(1, "nonexistent time"); 349 350 if (!jflag) { 351 utx.ut_type = OLD_TIME; 352 memset(utx.ut_id, 0, sizeof(utx.ut_id)); 353 (void)gettimeofday(&utx.ut_tv, NULL); 354 pututxline(&utx); 355 tv.tv_sec = tval; 356 tv.tv_usec = 0; 357 if (settimeofday(&tv, NULL) != 0) 358 err(1, "settimeofday (timeval)"); 359 utx.ut_type = NEW_TIME; 360 (void)gettimeofday(&utx.ut_tv, NULL); 361 pututxline(&utx); 362 363 if ((p = getlogin()) == NULL) 364 p = "???"; 365 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 366 } 367 } 368 369 static void 370 badformat(void) 371 { 372 warnx("illegal time format"); 373 usage(); 374 } 375 376 static void 377 iso8601_usage(const char *badarg) 378 { 379 errx(1, "invalid argument '%s' for -I", badarg); 380 } 381 382 static void 383 multipleformats(void) 384 { 385 errx(1, "multiple output formats specified"); 386 } 387 388 static void 389 usage(void) 390 { 391 (void)fprintf(stderr, "%s\n%s\n%s\n", 392 "usage: date [-jnRu] [-I[date|hours|minutes|seconds]] [-f input_fmt]", 393 " " 394 "[ -z output_zone ] [-r filename|seconds] [-v[+|-]val[y|m|w|d|H|M|S]]", 395 " " 396 "[[[[[[cc]yy]mm]dd]HH]MM[.SS] | new_date] [+output_fmt]" 397 ); 398 exit(1); 399 } 400