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 <locale.h> 52 #include <stdbool.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <syslog.h> 57 #include <unistd.h> 58 #include <utmpx.h> 59 60 #include "vary.h" 61 62 #ifndef TM_YEAR_BASE 63 #define TM_YEAR_BASE 1900 64 #endif 65 66 static time_t tval; 67 68 static void badformat(void); 69 static void iso8601_usage(const char *) __dead2; 70 static void multipleformats(void); 71 static void printdate(const char *); 72 static void printisodate(struct tm *); 73 static void setthetime(const char *, const char *, int); 74 static void usage(void) __dead2; 75 76 static const struct iso8601_fmt { 77 const char *refname; 78 const char *format_string; 79 } iso8601_fmts[] = { 80 { "date", "%Y-%m-%d" }, 81 { "hours", "T%H" }, 82 { "minutes", ":%M" }, 83 { "seconds", ":%S" }, 84 }; 85 static const struct iso8601_fmt *iso8601_selected; 86 87 static const char *rfc2822_format = "%a, %d %b %Y %T %z"; 88 89 int 90 main(int argc, char *argv[]) 91 { 92 int ch, rflag; 93 bool Iflag, jflag, Rflag; 94 const char *format; 95 char buf[1024]; 96 char *fmt, *outzone = NULL; 97 char *tmp; 98 struct vary *v; 99 const struct vary *badv; 100 struct tm *lt; 101 struct stat sb; 102 size_t i; 103 104 v = NULL; 105 fmt = NULL; 106 (void) setlocale(LC_TIME, ""); 107 rflag = 0; 108 Iflag = jflag = Rflag = 0; 109 while ((ch = getopt(argc, argv, "f:I::jnRr:uv:z:")) != -1) 110 switch((char)ch) { 111 case 'f': 112 fmt = optarg; 113 break; 114 case 'I': 115 if (Rflag) 116 multipleformats(); 117 Iflag = 1; 118 if (optarg == NULL) { 119 iso8601_selected = iso8601_fmts; 120 break; 121 } 122 for (i = 0; i < nitems(iso8601_fmts); i++) 123 if (strcmp(optarg, iso8601_fmts[i].refname) == 0) 124 break; 125 if (i == nitems(iso8601_fmts)) 126 iso8601_usage(optarg); 127 128 iso8601_selected = &iso8601_fmts[i]; 129 break; 130 case 'j': 131 jflag = 1; /* don't set time */ 132 break; 133 case 'n': 134 break; 135 case 'R': /* RFC 2822 datetime format */ 136 if (Iflag) 137 multipleformats(); 138 Rflag = 1; 139 break; 140 case 'r': /* user specified seconds */ 141 rflag = 1; 142 tval = strtoq(optarg, &tmp, 0); 143 if (*tmp != 0) { 144 if (stat(optarg, &sb) == 0) 145 tval = sb.st_mtim.tv_sec; 146 else 147 usage(); 148 } 149 break; 150 case 'u': /* do everything in UTC */ 151 (void)setenv("TZ", "UTC0", 1); 152 break; 153 case 'z': 154 outzone = optarg; 155 break; 156 case 'v': 157 v = vary_append(v, optarg); 158 break; 159 default: 160 usage(); 161 } 162 argc -= optind; 163 argv += optind; 164 165 if (!rflag && time(&tval) == -1) 166 err(1, "time"); 167 168 format = "%+"; 169 170 if (Rflag) 171 format = rfc2822_format; 172 173 /* allow the operands in any order */ 174 if (*argv && **argv == '+') { 175 if (Iflag) 176 multipleformats(); 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) 189 multipleformats(); 190 format = *argv + 1; 191 } 192 193 if (outzone != NULL && setenv("TZ", outzone, 1) != 0) 194 err(1, "setenv(TZ)"); 195 lt = localtime(&tval); 196 if (lt == NULL) 197 errx(1, "invalid time"); 198 badv = vary_apply(v, lt); 199 if (badv) { 200 fprintf(stderr, "%s: Cannot apply date adjustment\n", 201 badv->arg); 202 vary_destroy(v); 203 usage(); 204 } 205 vary_destroy(v); 206 207 if (Iflag) 208 printisodate(lt); 209 210 if (format == rfc2822_format) 211 /* 212 * When using RFC 2822 datetime format, don't honor the 213 * locale. 214 */ 215 setlocale(LC_TIME, "C"); 216 217 218 (void)strftime(buf, sizeof(buf), format, lt); 219 printdate(buf); 220 } 221 222 static void 223 printdate(const char *buf) 224 { 225 (void)printf("%s\n", buf); 226 if (fflush(stdout)) 227 err(1, "stdout"); 228 exit(EXIT_SUCCESS); 229 } 230 231 static void 232 printisodate(struct tm *lt) 233 { 234 const struct iso8601_fmt *it; 235 char fmtbuf[32], buf[32], tzbuf[8]; 236 237 fmtbuf[0] = 0; 238 for (it = iso8601_fmts; it <= iso8601_selected; it++) 239 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf)); 240 241 (void)strftime(buf, sizeof(buf), fmtbuf, lt); 242 243 if (iso8601_selected > iso8601_fmts) { 244 (void)strftime(tzbuf, sizeof(tzbuf), "%z", lt); 245 memmove(&tzbuf[4], &tzbuf[3], 3); 246 tzbuf[3] = ':'; 247 strlcat(buf, tzbuf, sizeof(buf)); 248 } 249 250 printdate(buf); 251 } 252 253 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 254 255 static void 256 setthetime(const char *fmt, const char *p, int jflag) 257 { 258 struct utmpx utx; 259 struct tm *lt; 260 struct timeval tv; 261 const char *dot, *t; 262 int century; 263 264 lt = localtime(&tval); 265 if (lt == NULL) 266 errx(1, "invalid time"); 267 lt->tm_isdst = -1; /* divine correct DST */ 268 269 if (fmt != NULL) { 270 t = strptime(p, fmt, lt); 271 if (t == NULL) { 272 fprintf(stderr, "Failed conversion of ``%s''" 273 " using format ``%s''\n", p, fmt); 274 badformat(); 275 } else if (*t != '\0') 276 fprintf(stderr, "Warning: Ignoring %ld extraneous" 277 " characters in date string (%s)\n", 278 (long) strlen(t), t); 279 } else { 280 for (t = p, dot = NULL; *t; ++t) { 281 if (isdigit(*t)) 282 continue; 283 if (*t == '.' && dot == NULL) { 284 dot = t; 285 continue; 286 } 287 badformat(); 288 } 289 290 if (dot != NULL) { /* .ss */ 291 dot++; /* *dot++ = '\0'; */ 292 if (strlen(dot) != 2) 293 badformat(); 294 lt->tm_sec = ATOI2(dot); 295 if (lt->tm_sec > 61) 296 badformat(); 297 } else 298 lt->tm_sec = 0; 299 300 century = 0; 301 /* if p has a ".ss" field then let's pretend it's not there */ 302 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 303 case 12: /* cc */ 304 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 305 century = 1; 306 /* FALLTHROUGH */ 307 case 10: /* yy */ 308 if (century) 309 lt->tm_year += ATOI2(p); 310 else { 311 lt->tm_year = ATOI2(p); 312 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 313 lt->tm_year += 2000 - TM_YEAR_BASE; 314 else 315 lt->tm_year += 1900 - TM_YEAR_BASE; 316 } 317 /* FALLTHROUGH */ 318 case 8: /* mm */ 319 lt->tm_mon = ATOI2(p); 320 if (lt->tm_mon > 12) 321 badformat(); 322 --lt->tm_mon; /* time struct is 0 - 11 */ 323 /* FALLTHROUGH */ 324 case 6: /* dd */ 325 lt->tm_mday = ATOI2(p); 326 if (lt->tm_mday > 31) 327 badformat(); 328 /* FALLTHROUGH */ 329 case 4: /* HH */ 330 lt->tm_hour = ATOI2(p); 331 if (lt->tm_hour > 23) 332 badformat(); 333 /* FALLTHROUGH */ 334 case 2: /* MM */ 335 lt->tm_min = ATOI2(p); 336 if (lt->tm_min > 59) 337 badformat(); 338 break; 339 default: 340 badformat(); 341 } 342 } 343 344 /* convert broken-down time to GMT clock time */ 345 if ((tval = mktime(lt)) == -1) 346 errx(1, "nonexistent time"); 347 348 if (!jflag) { 349 utx.ut_type = OLD_TIME; 350 memset(utx.ut_id, 0, sizeof(utx.ut_id)); 351 (void)gettimeofday(&utx.ut_tv, NULL); 352 pututxline(&utx); 353 tv.tv_sec = tval; 354 tv.tv_usec = 0; 355 if (settimeofday(&tv, NULL) != 0) 356 err(1, "settimeofday (timeval)"); 357 utx.ut_type = NEW_TIME; 358 (void)gettimeofday(&utx.ut_tv, NULL); 359 pututxline(&utx); 360 361 if ((p = getlogin()) == NULL) 362 p = "???"; 363 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 364 } 365 } 366 367 static void 368 badformat(void) 369 { 370 warnx("illegal time format"); 371 usage(); 372 } 373 374 static void 375 iso8601_usage(const char *badarg) 376 { 377 errx(1, "invalid argument '%s' for -I", badarg); 378 } 379 380 static void 381 multipleformats(void) 382 { 383 errx(1, "multiple output formats specified"); 384 } 385 386 static void 387 usage(void) 388 { 389 (void)fprintf(stderr, "%s\n%s\n%s\n", 390 "usage: date [-jnRu] [-I[date|hours|minutes|seconds]] [-f input_fmt]", 391 " " 392 "[ -z output_zone ] [-r filename|seconds] [-v[+|-]val[y|m|w|d|H|M|S]]", 393 " " 394 "[[[[[[cc]yy]mm]dd]HH]MM[.SS] | new_date] [+output_fmt]" 395 ); 396 exit(1); 397 } 398