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 #include <sys/param.h> 33 #include <sys/time.h> 34 #include <sys/stat.h> 35 36 #include <ctype.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <locale.h> 40 #include <stdbool.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <syslog.h> 45 #include <unistd.h> 46 #include <utmpx.h> 47 48 #include "vary.h" 49 50 #ifndef TM_YEAR_BASE 51 #define TM_YEAR_BASE 1900 52 #endif 53 54 static void badformat(void); 55 static void iso8601_usage(const char *) __dead2; 56 static void multipleformats(void); 57 static void printdate(const char *); 58 static void printisodate(struct tm *, long); 59 static void setthetime(const char *, const char *, int, struct timespec *); 60 static size_t strftime_ns(char * __restrict, size_t, const char * __restrict, 61 const struct tm * __restrict, long); 62 static void usage(void) __dead2; 63 64 static const struct iso8601_fmt { 65 const char *refname; 66 const char *format_string; 67 } iso8601_fmts[] = { 68 { "date", "%Y-%m-%d" }, 69 { "hours", "T%H" }, 70 { "minutes", ":%M" }, 71 { "seconds", ":%S" }, 72 { "ns", ",%N" }, 73 }; 74 static const struct iso8601_fmt *iso8601_selected; 75 76 static const char *rfc2822_format = "%a, %d %b %Y %T %z"; 77 78 int 79 main(int argc, char *argv[]) 80 { 81 struct timespec ts; 82 int ch, rflag; 83 bool Iflag, jflag, Rflag; 84 const char *format; 85 char buf[1024]; 86 char *fmt, *outzone = NULL; 87 char *tmp; 88 struct vary *v; 89 const struct vary *badv; 90 struct tm *lt; 91 struct stat sb; 92 size_t i; 93 94 v = NULL; 95 fmt = NULL; 96 (void) setlocale(LC_TIME, ""); 97 rflag = 0; 98 Iflag = jflag = Rflag = 0; 99 while ((ch = getopt(argc, argv, "f:I::jnRr:uv:z:")) != -1) 100 switch((char)ch) { 101 case 'f': 102 fmt = optarg; 103 break; 104 case 'I': 105 if (Rflag) 106 multipleformats(); 107 Iflag = 1; 108 if (optarg == NULL) { 109 iso8601_selected = iso8601_fmts; 110 break; 111 } 112 for (i = 0; i < nitems(iso8601_fmts); i++) 113 if (strcmp(optarg, iso8601_fmts[i].refname) == 0) 114 break; 115 if (i == nitems(iso8601_fmts)) 116 iso8601_usage(optarg); 117 118 iso8601_selected = &iso8601_fmts[i]; 119 break; 120 case 'j': 121 jflag = 1; /* don't set time */ 122 break; 123 case 'n': 124 break; 125 case 'R': /* RFC 2822 datetime format */ 126 if (Iflag) 127 multipleformats(); 128 Rflag = 1; 129 break; 130 case 'r': /* user specified seconds */ 131 rflag = 1; 132 ts.tv_sec = strtoq(optarg, &tmp, 0); 133 if (*tmp != 0) { 134 if (stat(optarg, &sb) == 0) { 135 ts.tv_sec = sb.st_mtim.tv_sec; 136 ts.tv_nsec = sb.st_mtim.tv_nsec; 137 } else 138 usage(); 139 } 140 break; 141 case 'u': /* do everything in UTC */ 142 (void)setenv("TZ", "UTC0", 1); 143 break; 144 case 'z': 145 outzone = optarg; 146 break; 147 case 'v': 148 v = vary_append(v, optarg); 149 break; 150 default: 151 usage(); 152 } 153 argc -= optind; 154 argv += optind; 155 156 if (!rflag && clock_gettime(CLOCK_REALTIME, &ts) == -1) 157 err(1, "clock_gettime"); 158 159 format = "%+"; 160 161 if (Rflag) 162 format = rfc2822_format; 163 164 /* allow the operands in any order */ 165 if (*argv && **argv == '+') { 166 if (Iflag) 167 multipleformats(); 168 format = *argv + 1; 169 ++argv; 170 } 171 172 if (*argv) { 173 setthetime(fmt, *argv, jflag, &ts); 174 ++argv; 175 } else if (fmt != NULL) 176 usage(); 177 178 if (*argv && **argv == '+') { 179 if (Iflag) 180 multipleformats(); 181 format = *argv + 1; 182 } 183 184 if (outzone != NULL && setenv("TZ", outzone, 1) != 0) 185 err(1, "setenv(TZ)"); 186 lt = localtime(&ts.tv_sec); 187 if (lt == NULL) 188 errx(1, "invalid time"); 189 badv = vary_apply(v, lt); 190 if (badv) { 191 fprintf(stderr, "%s: Cannot apply date adjustment\n", 192 badv->arg); 193 vary_destroy(v); 194 usage(); 195 } 196 vary_destroy(v); 197 198 if (Iflag) 199 printisodate(lt, ts.tv_nsec); 200 201 if (format == rfc2822_format) 202 /* 203 * When using RFC 2822 datetime format, don't honor the 204 * locale. 205 */ 206 setlocale(LC_TIME, "C"); 207 208 209 (void)strftime_ns(buf, sizeof(buf), format, lt, ts.tv_nsec); 210 printdate(buf); 211 } 212 213 static void 214 printdate(const char *buf) 215 { 216 (void)printf("%s\n", buf); 217 if (fflush(stdout)) 218 err(1, "stdout"); 219 exit(EXIT_SUCCESS); 220 } 221 222 static void 223 printisodate(struct tm *lt, long nsec) 224 { 225 const struct iso8601_fmt *it; 226 char fmtbuf[64], buf[64], tzbuf[8]; 227 228 fmtbuf[0] = 0; 229 for (it = iso8601_fmts; it <= iso8601_selected; it++) 230 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf)); 231 232 (void)strftime_ns(buf, sizeof(buf), fmtbuf, lt, nsec); 233 234 if (iso8601_selected > iso8601_fmts) { 235 (void)strftime_ns(tzbuf, sizeof(tzbuf), "%z", lt, nsec); 236 memmove(&tzbuf[4], &tzbuf[3], 3); 237 tzbuf[3] = ':'; 238 strlcat(buf, tzbuf, sizeof(buf)); 239 } 240 241 printdate(buf); 242 } 243 244 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 245 246 static void 247 setthetime(const char *fmt, const char *p, int jflag, struct timespec *ts) 248 { 249 struct utmpx utx; 250 struct tm *lt; 251 const char *dot, *t; 252 int century; 253 254 lt = localtime(&ts->tv_sec); 255 if (lt == NULL) 256 errx(1, "invalid time"); 257 lt->tm_isdst = -1; /* divine correct DST */ 258 259 if (fmt != NULL) { 260 t = strptime(p, fmt, lt); 261 if (t == NULL) { 262 fprintf(stderr, "Failed conversion of ``%s''" 263 " using format ``%s''\n", p, fmt); 264 badformat(); 265 } else if (*t != '\0') 266 fprintf(stderr, "Warning: Ignoring %ld extraneous" 267 " characters in date string (%s)\n", 268 (long) strlen(t), t); 269 } else { 270 for (t = p, dot = NULL; *t; ++t) { 271 if (isdigit(*t)) 272 continue; 273 if (*t == '.' && dot == NULL) { 274 dot = t; 275 continue; 276 } 277 badformat(); 278 } 279 280 if (dot != NULL) { /* .ss */ 281 dot++; /* *dot++ = '\0'; */ 282 if (strlen(dot) != 2) 283 badformat(); 284 lt->tm_sec = ATOI2(dot); 285 if (lt->tm_sec > 61) 286 badformat(); 287 } else 288 lt->tm_sec = 0; 289 290 century = 0; 291 /* if p has a ".ss" field then let's pretend it's not there */ 292 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 293 case 12: /* cc */ 294 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 295 century = 1; 296 /* FALLTHROUGH */ 297 case 10: /* yy */ 298 if (century) 299 lt->tm_year += ATOI2(p); 300 else { 301 lt->tm_year = ATOI2(p); 302 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 303 lt->tm_year += 2000 - TM_YEAR_BASE; 304 else 305 lt->tm_year += 1900 - TM_YEAR_BASE; 306 } 307 /* FALLTHROUGH */ 308 case 8: /* mm */ 309 lt->tm_mon = ATOI2(p); 310 if (lt->tm_mon > 12) 311 badformat(); 312 --lt->tm_mon; /* time struct is 0 - 11 */ 313 /* FALLTHROUGH */ 314 case 6: /* dd */ 315 lt->tm_mday = ATOI2(p); 316 if (lt->tm_mday > 31) 317 badformat(); 318 /* FALLTHROUGH */ 319 case 4: /* HH */ 320 lt->tm_hour = ATOI2(p); 321 if (lt->tm_hour > 23) 322 badformat(); 323 /* FALLTHROUGH */ 324 case 2: /* MM */ 325 lt->tm_min = ATOI2(p); 326 if (lt->tm_min > 59) 327 badformat(); 328 break; 329 default: 330 badformat(); 331 } 332 } 333 334 /* convert broken-down time to GMT clock time */ 335 if ((ts->tv_sec = mktime(lt)) == -1) 336 errx(1, "nonexistent time"); 337 ts->tv_nsec = 0; 338 339 if (!jflag) { 340 utx.ut_type = OLD_TIME; 341 memset(utx.ut_id, 0, sizeof(utx.ut_id)); 342 (void)gettimeofday(&utx.ut_tv, NULL); 343 pututxline(&utx); 344 if (clock_settime(CLOCK_REALTIME, ts) != 0) 345 err(1, "clock_settime"); 346 utx.ut_type = NEW_TIME; 347 (void)gettimeofday(&utx.ut_tv, NULL); 348 pututxline(&utx); 349 350 if ((p = getlogin()) == NULL) 351 p = "???"; 352 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 353 } 354 } 355 356 /* 357 * The strftime_ns function is a wrapper around strftime(3), which adds support 358 * for features absent from strftime(3). Currently, the only extra feature is 359 * support for %N, the nanosecond conversion specification. 360 * 361 * The functions scans the format string for the non-standard conversion 362 * specifications and replaces them with the date and time values before 363 * passing the format string to strftime(3). The handling of the non-standard 364 * conversion specifications happens before the call to strftime(3) to handle 365 * cases like "%%N" correctly ("%%N" should yield "%N" instead of nanoseconds). 366 */ 367 static size_t 368 strftime_ns(char * __restrict s, size_t maxsize, const char * __restrict format, 369 const struct tm * __restrict t, long nsec) 370 { 371 size_t prefixlen; 372 size_t ret; 373 char *newformat; 374 char *oldformat; 375 const char *prefix; 376 const char *suffix; 377 const char *tok; 378 bool seen_percent; 379 380 seen_percent = false; 381 if (asprintf(&newformat, "%s", format) < 0) 382 err(1, "asprintf"); 383 tok = newformat; 384 for (tok = newformat; *tok != '\0'; tok++) { 385 switch (*tok) { 386 case '%': 387 /* 388 * If the previous token was a percent sign, 389 * then there are two percent tokens in a row. 390 */ 391 if (seen_percent) 392 seen_percent = false; 393 else 394 seen_percent = true; 395 break; 396 case 'N': 397 if (seen_percent) { 398 oldformat = newformat; 399 prefix = oldformat; 400 prefixlen = tok - oldformat - 1; 401 suffix = tok + 1; 402 /* 403 * Construct a new format string from the 404 * prefix (i.e., the part of the old fromat 405 * from its beginning to the currently handled 406 * "%N" conversion specification, the 407 * nanoseconds, and the suffix (i.e., the part 408 * of the old format from the next token to the 409 * end). 410 */ 411 if (asprintf(&newformat, "%.*s%.9ld%s", 412 (int)prefixlen, prefix, nsec, 413 suffix) < 0) { 414 err(1, "asprintf"); 415 } 416 free(oldformat); 417 tok = newformat + prefixlen + 9; 418 } 419 seen_percent = false; 420 break; 421 default: 422 seen_percent = false; 423 break; 424 } 425 } 426 427 ret = strftime(s, maxsize, newformat, t); 428 free(newformat); 429 return (ret); 430 } 431 432 static void 433 badformat(void) 434 { 435 warnx("illegal time format"); 436 usage(); 437 } 438 439 static void 440 iso8601_usage(const char *badarg) 441 { 442 errx(1, "invalid argument '%s' for -I", badarg); 443 } 444 445 static void 446 multipleformats(void) 447 { 448 errx(1, "multiple output formats specified"); 449 } 450 451 static void 452 usage(void) 453 { 454 (void)fprintf(stderr, "%s\n%s\n%s\n", 455 "usage: date [-jnRu] [-I[date|hours|minutes|seconds|ns]] [-f input_fmt]", 456 " " 457 "[ -z output_zone ] [-r filename|seconds] [-v[+|-]val[y|m|w|d|H|M|S]]", 458 " " 459 "[[[[[[cc]yy]mm]dd]HH]MM[.SS] | new_date] [+output_fmt]" 460 ); 461 exit(1); 462 } 463