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 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/stat.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <locale.h> 53 #include <stdbool.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <syslog.h> 58 #include <unistd.h> 59 #include <utmpx.h> 60 61 #include "vary.h" 62 63 #ifndef TM_YEAR_BASE 64 #define TM_YEAR_BASE 1900 65 #endif 66 67 static void badformat(void); 68 static void iso8601_usage(const char *) __dead2; 69 static void multipleformats(void); 70 static void printdate(const char *); 71 static void printisodate(struct tm *, long); 72 static void setthetime(const char *, const char *, int, struct timespec *); 73 static size_t strftime_ns(char * __restrict, size_t, const char * __restrict, 74 const struct tm * __restrict, long); 75 static void usage(void) __dead2; 76 77 static const struct iso8601_fmt { 78 const char *refname; 79 const char *format_string; 80 } iso8601_fmts[] = { 81 { "date", "%Y-%m-%d" }, 82 { "hours", "T%H" }, 83 { "minutes", ":%M" }, 84 { "seconds", ":%S" }, 85 { "ns", ",%N" }, 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 struct timespec ts; 95 int ch, rflag; 96 bool Iflag, jflag, Rflag; 97 const char *format; 98 char buf[1024]; 99 char *fmt, *outzone = NULL; 100 char *tmp; 101 struct vary *v; 102 const struct vary *badv; 103 struct tm *lt; 104 struct stat sb; 105 size_t i; 106 107 v = NULL; 108 fmt = NULL; 109 (void) setlocale(LC_TIME, ""); 110 rflag = 0; 111 Iflag = jflag = Rflag = 0; 112 ts.tv_sec = 0; 113 ts.tv_nsec = 0; 114 while ((ch = getopt(argc, argv, "f:I::jnRr:uv:z:")) != -1) 115 switch((char)ch) { 116 case 'f': 117 fmt = optarg; 118 break; 119 case 'I': 120 if (Rflag) 121 multipleformats(); 122 Iflag = 1; 123 if (optarg == NULL) { 124 iso8601_selected = iso8601_fmts; 125 break; 126 } 127 for (i = 0; i < nitems(iso8601_fmts); i++) 128 if (strcmp(optarg, iso8601_fmts[i].refname) == 0) 129 break; 130 if (i == nitems(iso8601_fmts)) 131 iso8601_usage(optarg); 132 133 iso8601_selected = &iso8601_fmts[i]; 134 break; 135 case 'j': 136 jflag = 1; /* don't set time */ 137 break; 138 case 'n': 139 break; 140 case 'R': /* RFC 2822 datetime format */ 141 if (Iflag) 142 multipleformats(); 143 Rflag = 1; 144 break; 145 case 'r': /* user specified seconds */ 146 rflag = 1; 147 ts.tv_sec = strtoq(optarg, &tmp, 0); 148 if (*tmp != 0) { 149 if (stat(optarg, &sb) == 0) { 150 ts.tv_sec = sb.st_mtim.tv_sec; 151 ts.tv_nsec = sb.st_mtim.tv_nsec; 152 } else 153 usage(); 154 } 155 break; 156 case 'u': /* do everything in UTC */ 157 (void)setenv("TZ", "UTC0", 1); 158 break; 159 case 'z': 160 outzone = optarg; 161 break; 162 case 'v': 163 v = vary_append(v, optarg); 164 break; 165 default: 166 usage(); 167 } 168 argc -= optind; 169 argv += optind; 170 171 if (!rflag && clock_gettime(CLOCK_REALTIME, &ts) == -1) 172 err(1, "clock_gettime"); 173 174 format = "%+"; 175 176 if (Rflag) 177 format = rfc2822_format; 178 179 /* allow the operands in any order */ 180 if (*argv && **argv == '+') { 181 if (Iflag) 182 multipleformats(); 183 format = *argv + 1; 184 ++argv; 185 } 186 187 if (*argv) { 188 setthetime(fmt, *argv, jflag, &ts); 189 ++argv; 190 } else if (fmt != NULL) 191 usage(); 192 193 if (*argv && **argv == '+') { 194 if (Iflag) 195 multipleformats(); 196 format = *argv + 1; 197 } 198 199 if (outzone != NULL && setenv("TZ", outzone, 1) != 0) 200 err(1, "setenv(TZ)"); 201 lt = localtime(&ts.tv_sec); 202 if (lt == NULL) 203 errx(1, "invalid time"); 204 badv = vary_apply(v, lt); 205 if (badv) { 206 fprintf(stderr, "%s: Cannot apply date adjustment\n", 207 badv->arg); 208 vary_destroy(v); 209 usage(); 210 } 211 vary_destroy(v); 212 213 if (Iflag) 214 printisodate(lt, ts.tv_nsec); 215 216 if (format == rfc2822_format) 217 /* 218 * When using RFC 2822 datetime format, don't honor the 219 * locale. 220 */ 221 setlocale(LC_TIME, "C"); 222 223 224 (void)strftime_ns(buf, sizeof(buf), format, lt, ts.tv_nsec); 225 printdate(buf); 226 } 227 228 static void 229 printdate(const char *buf) 230 { 231 (void)printf("%s\n", buf); 232 if (fflush(stdout)) 233 err(1, "stdout"); 234 exit(EXIT_SUCCESS); 235 } 236 237 static void 238 printisodate(struct tm *lt, long nsec) 239 { 240 const struct iso8601_fmt *it; 241 char fmtbuf[64], buf[64], tzbuf[8]; 242 243 fmtbuf[0] = 0; 244 for (it = iso8601_fmts; it <= iso8601_selected; it++) 245 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf)); 246 247 (void)strftime_ns(buf, sizeof(buf), fmtbuf, lt, nsec); 248 249 if (iso8601_selected > iso8601_fmts) { 250 (void)strftime_ns(tzbuf, sizeof(tzbuf), "%z", lt, nsec); 251 memmove(&tzbuf[4], &tzbuf[3], 3); 252 tzbuf[3] = ':'; 253 strlcat(buf, tzbuf, sizeof(buf)); 254 } 255 256 printdate(buf); 257 } 258 259 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 260 261 static void 262 setthetime(const char *fmt, const char *p, int jflag, struct timespec *ts) 263 { 264 struct utmpx utx; 265 struct tm *lt; 266 const char *dot, *t; 267 int century; 268 269 lt = localtime(&ts->tv_sec); 270 if (lt == NULL) 271 errx(1, "invalid time"); 272 lt->tm_isdst = -1; /* divine correct DST */ 273 274 if (fmt != NULL) { 275 t = strptime(p, fmt, lt); 276 if (t == NULL) { 277 fprintf(stderr, "Failed conversion of ``%s''" 278 " using format ``%s''\n", p, fmt); 279 badformat(); 280 } else if (*t != '\0') 281 fprintf(stderr, "Warning: Ignoring %ld extraneous" 282 " characters in date string (%s)\n", 283 (long) strlen(t), t); 284 } else { 285 for (t = p, dot = NULL; *t; ++t) { 286 if (isdigit(*t)) 287 continue; 288 if (*t == '.' && dot == NULL) { 289 dot = t; 290 continue; 291 } 292 badformat(); 293 } 294 295 if (dot != NULL) { /* .ss */ 296 dot++; /* *dot++ = '\0'; */ 297 if (strlen(dot) != 2) 298 badformat(); 299 lt->tm_sec = ATOI2(dot); 300 if (lt->tm_sec > 61) 301 badformat(); 302 } else 303 lt->tm_sec = 0; 304 305 century = 0; 306 /* if p has a ".ss" field then let's pretend it's not there */ 307 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 308 case 12: /* cc */ 309 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 310 century = 1; 311 /* FALLTHROUGH */ 312 case 10: /* yy */ 313 if (century) 314 lt->tm_year += ATOI2(p); 315 else { 316 lt->tm_year = ATOI2(p); 317 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 318 lt->tm_year += 2000 - TM_YEAR_BASE; 319 else 320 lt->tm_year += 1900 - TM_YEAR_BASE; 321 } 322 /* FALLTHROUGH */ 323 case 8: /* mm */ 324 lt->tm_mon = ATOI2(p); 325 if (lt->tm_mon > 12) 326 badformat(); 327 --lt->tm_mon; /* time struct is 0 - 11 */ 328 /* FALLTHROUGH */ 329 case 6: /* dd */ 330 lt->tm_mday = ATOI2(p); 331 if (lt->tm_mday > 31) 332 badformat(); 333 /* FALLTHROUGH */ 334 case 4: /* HH */ 335 lt->tm_hour = ATOI2(p); 336 if (lt->tm_hour > 23) 337 badformat(); 338 /* FALLTHROUGH */ 339 case 2: /* MM */ 340 lt->tm_min = ATOI2(p); 341 if (lt->tm_min > 59) 342 badformat(); 343 break; 344 default: 345 badformat(); 346 } 347 } 348 349 /* convert broken-down time to GMT clock time */ 350 lt->tm_yday = -1; 351 ts->tv_sec = mktime(lt); 352 if (lt->tm_yday == -1) 353 errx(1, "nonexistent time"); 354 ts->tv_nsec = 0; 355 356 if (!jflag) { 357 utx.ut_type = OLD_TIME; 358 memset(utx.ut_id, 0, sizeof(utx.ut_id)); 359 (void)gettimeofday(&utx.ut_tv, NULL); 360 pututxline(&utx); 361 if (clock_settime(CLOCK_REALTIME, ts) != 0) 362 err(1, "clock_settime"); 363 utx.ut_type = NEW_TIME; 364 (void)gettimeofday(&utx.ut_tv, NULL); 365 pututxline(&utx); 366 367 if ((p = getlogin()) == NULL) 368 p = "???"; 369 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 370 } 371 } 372 373 /* 374 * The strftime_ns function is a wrapper around strftime(3), which adds support 375 * for features absent from strftime(3). Currently, the only extra feature is 376 * support for %N, the nanosecond conversion specification. 377 * 378 * The functions scans the format string for the non-standard conversion 379 * specifications and replaces them with the date and time values before 380 * passing the format string to strftime(3). The handling of the non-standard 381 * conversion specifications happens before the call to strftime(3) to handle 382 * cases like "%%N" correctly ("%%N" should yield "%N" instead of nanoseconds). 383 */ 384 static size_t 385 strftime_ns(char * __restrict s, size_t maxsize, const char * __restrict format, 386 const struct tm * __restrict t, long nsec) 387 { 388 size_t prefixlen; 389 size_t ret; 390 char *newformat; 391 char *oldformat; 392 const char *prefix; 393 const char *suffix; 394 const char *tok; 395 bool seen_percent; 396 397 seen_percent = false; 398 if (asprintf(&newformat, "%s", format) < 0) 399 err(1, "asprintf"); 400 tok = newformat; 401 for (tok = newformat; *tok != '\0'; tok++) { 402 switch (*tok) { 403 case '%': 404 /* 405 * If the previous token was a percent sign, 406 * then there are two percent tokens in a row. 407 */ 408 if (seen_percent) 409 seen_percent = false; 410 else 411 seen_percent = true; 412 break; 413 case 'N': 414 if (seen_percent) { 415 oldformat = newformat; 416 prefix = oldformat; 417 prefixlen = tok - oldformat - 1; 418 suffix = tok + 1; 419 /* 420 * Construct a new format string from the 421 * prefix (i.e., the part of the old fromat 422 * from its beginning to the currently handled 423 * "%N" conversion specification, the 424 * nanoseconds, and the suffix (i.e., the part 425 * of the old format from the next token to the 426 * end). 427 */ 428 if (asprintf(&newformat, "%.*s%.9ld%s", 429 (int)prefixlen, prefix, nsec, 430 suffix) < 0) { 431 err(1, "asprintf"); 432 } 433 free(oldformat); 434 tok = newformat + prefixlen + 9; 435 } 436 seen_percent = false; 437 break; 438 default: 439 seen_percent = false; 440 break; 441 } 442 } 443 444 ret = strftime(s, maxsize, newformat, t); 445 free(newformat); 446 return (ret); 447 } 448 449 static void 450 badformat(void) 451 { 452 warnx("illegal time format"); 453 usage(); 454 } 455 456 static void 457 iso8601_usage(const char *badarg) 458 { 459 errx(1, "invalid argument '%s' for -I", badarg); 460 } 461 462 static void 463 multipleformats(void) 464 { 465 errx(1, "multiple output formats specified"); 466 } 467 468 static void 469 usage(void) 470 { 471 (void)fprintf(stderr, "%s\n%s\n%s\n", 472 "usage: date [-jnRu] [-I[date|hours|minutes|seconds|ns]] [-f input_fmt]", 473 " " 474 "[ -z output_zone ] [-r filename|seconds] [-v[+|-]val[y|m|w|d|H|M|S]]", 475 " " 476 "[[[[[[cc]yy]mm]dd]HH]MM[.SS] | new_date] [+output_fmt]" 477 ); 478 exit(1); 479 } 480