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 <locale.h> 39 #include <stdbool.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <syslog.h> 44 #include <unistd.h> 45 #include <utmpx.h> 46 47 #include "vary.h" 48 49 #ifndef TM_YEAR_BASE 50 #define TM_YEAR_BASE 1900 51 #endif 52 53 static time_t tval; 54 55 static void badformat(void); 56 static void iso8601_usage(const char *) __dead2; 57 static void multipleformats(void); 58 static void printdate(const char *); 59 static void printisodate(struct tm *); 60 static void setthetime(const char *, const char *, int); 61 static void usage(void) __dead2; 62 63 static const struct iso8601_fmt { 64 const char *refname; 65 const char *format_string; 66 } iso8601_fmts[] = { 67 { "date", "%Y-%m-%d" }, 68 { "hours", "T%H" }, 69 { "minutes", ":%M" }, 70 { "seconds", ":%S" }, 71 }; 72 static const struct iso8601_fmt *iso8601_selected; 73 74 static const char *rfc2822_format = "%a, %d %b %Y %T %z"; 75 76 int 77 main(int argc, char *argv[]) 78 { 79 int ch, rflag; 80 bool Iflag, jflag, Rflag; 81 const char *format; 82 char buf[1024]; 83 char *fmt, *outzone = NULL; 84 char *tmp; 85 struct vary *v; 86 const struct vary *badv; 87 struct tm *lt; 88 struct stat sb; 89 size_t i; 90 91 v = NULL; 92 fmt = NULL; 93 (void) setlocale(LC_TIME, ""); 94 rflag = 0; 95 Iflag = jflag = Rflag = 0; 96 while ((ch = getopt(argc, argv, "f:I::jnRr:uv:z:")) != -1) 97 switch((char)ch) { 98 case 'f': 99 fmt = optarg; 100 break; 101 case 'I': 102 if (Rflag) 103 multipleformats(); 104 Iflag = 1; 105 if (optarg == NULL) { 106 iso8601_selected = iso8601_fmts; 107 break; 108 } 109 for (i = 0; i < nitems(iso8601_fmts); i++) 110 if (strcmp(optarg, iso8601_fmts[i].refname) == 0) 111 break; 112 if (i == nitems(iso8601_fmts)) 113 iso8601_usage(optarg); 114 115 iso8601_selected = &iso8601_fmts[i]; 116 break; 117 case 'j': 118 jflag = 1; /* don't set time */ 119 break; 120 case 'n': 121 break; 122 case 'R': /* RFC 2822 datetime format */ 123 if (Iflag) 124 multipleformats(); 125 Rflag = 1; 126 break; 127 case 'r': /* user specified seconds */ 128 rflag = 1; 129 tval = strtoq(optarg, &tmp, 0); 130 if (*tmp != 0) { 131 if (stat(optarg, &sb) == 0) 132 tval = sb.st_mtim.tv_sec; 133 else 134 usage(); 135 } 136 break; 137 case 'u': /* do everything in UTC */ 138 (void)setenv("TZ", "UTC0", 1); 139 break; 140 case 'z': 141 outzone = optarg; 142 break; 143 case 'v': 144 v = vary_append(v, optarg); 145 break; 146 default: 147 usage(); 148 } 149 argc -= optind; 150 argv += optind; 151 152 if (!rflag && time(&tval) == -1) 153 err(1, "time"); 154 155 format = "%+"; 156 157 if (Rflag) 158 format = rfc2822_format; 159 160 /* allow the operands in any order */ 161 if (*argv && **argv == '+') { 162 if (Iflag) 163 multipleformats(); 164 format = *argv + 1; 165 ++argv; 166 } 167 168 if (*argv) { 169 setthetime(fmt, *argv, jflag); 170 ++argv; 171 } else if (fmt != NULL) 172 usage(); 173 174 if (*argv && **argv == '+') { 175 if (Iflag) 176 multipleformats(); 177 format = *argv + 1; 178 } 179 180 if (outzone != NULL && setenv("TZ", outzone, 1) != 0) 181 err(1, "setenv(TZ)"); 182 lt = localtime(&tval); 183 if (lt == NULL) 184 errx(1, "invalid time"); 185 badv = vary_apply(v, lt); 186 if (badv) { 187 fprintf(stderr, "%s: Cannot apply date adjustment\n", 188 badv->arg); 189 vary_destroy(v); 190 usage(); 191 } 192 vary_destroy(v); 193 194 if (Iflag) 195 printisodate(lt); 196 197 if (format == rfc2822_format) 198 /* 199 * When using RFC 2822 datetime format, don't honor the 200 * locale. 201 */ 202 setlocale(LC_TIME, "C"); 203 204 205 (void)strftime(buf, sizeof(buf), format, lt); 206 printdate(buf); 207 } 208 209 static void 210 printdate(const char *buf) 211 { 212 (void)printf("%s\n", buf); 213 if (fflush(stdout)) 214 err(1, "stdout"); 215 exit(EXIT_SUCCESS); 216 } 217 218 static void 219 printisodate(struct tm *lt) 220 { 221 const struct iso8601_fmt *it; 222 char fmtbuf[32], buf[32], tzbuf[8]; 223 224 fmtbuf[0] = 0; 225 for (it = iso8601_fmts; it <= iso8601_selected; it++) 226 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf)); 227 228 (void)strftime(buf, sizeof(buf), fmtbuf, lt); 229 230 if (iso8601_selected > iso8601_fmts) { 231 (void)strftime(tzbuf, sizeof(tzbuf), "%z", lt); 232 memmove(&tzbuf[4], &tzbuf[3], 3); 233 tzbuf[3] = ':'; 234 strlcat(buf, tzbuf, sizeof(buf)); 235 } 236 237 printdate(buf); 238 } 239 240 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 241 242 static void 243 setthetime(const char *fmt, const char *p, int jflag) 244 { 245 struct utmpx utx; 246 struct tm *lt; 247 struct timeval tv; 248 const char *dot, *t; 249 int century; 250 251 lt = localtime(&tval); 252 if (lt == NULL) 253 errx(1, "invalid time"); 254 lt->tm_isdst = -1; /* divine correct DST */ 255 256 if (fmt != NULL) { 257 t = strptime(p, fmt, lt); 258 if (t == NULL) { 259 fprintf(stderr, "Failed conversion of ``%s''" 260 " using format ``%s''\n", p, fmt); 261 badformat(); 262 } else if (*t != '\0') 263 fprintf(stderr, "Warning: Ignoring %ld extraneous" 264 " characters in date string (%s)\n", 265 (long) strlen(t), t); 266 } else { 267 for (t = p, dot = NULL; *t; ++t) { 268 if (isdigit(*t)) 269 continue; 270 if (*t == '.' && dot == NULL) { 271 dot = t; 272 continue; 273 } 274 badformat(); 275 } 276 277 if (dot != NULL) { /* .ss */ 278 dot++; /* *dot++ = '\0'; */ 279 if (strlen(dot) != 2) 280 badformat(); 281 lt->tm_sec = ATOI2(dot); 282 if (lt->tm_sec > 61) 283 badformat(); 284 } else 285 lt->tm_sec = 0; 286 287 century = 0; 288 /* if p has a ".ss" field then let's pretend it's not there */ 289 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 290 case 12: /* cc */ 291 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 292 century = 1; 293 /* FALLTHROUGH */ 294 case 10: /* yy */ 295 if (century) 296 lt->tm_year += ATOI2(p); 297 else { 298 lt->tm_year = ATOI2(p); 299 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 300 lt->tm_year += 2000 - TM_YEAR_BASE; 301 else 302 lt->tm_year += 1900 - TM_YEAR_BASE; 303 } 304 /* FALLTHROUGH */ 305 case 8: /* mm */ 306 lt->tm_mon = ATOI2(p); 307 if (lt->tm_mon > 12) 308 badformat(); 309 --lt->tm_mon; /* time struct is 0 - 11 */ 310 /* FALLTHROUGH */ 311 case 6: /* dd */ 312 lt->tm_mday = ATOI2(p); 313 if (lt->tm_mday > 31) 314 badformat(); 315 /* FALLTHROUGH */ 316 case 4: /* HH */ 317 lt->tm_hour = ATOI2(p); 318 if (lt->tm_hour > 23) 319 badformat(); 320 /* FALLTHROUGH */ 321 case 2: /* MM */ 322 lt->tm_min = ATOI2(p); 323 if (lt->tm_min > 59) 324 badformat(); 325 break; 326 default: 327 badformat(); 328 } 329 } 330 331 /* convert broken-down time to GMT clock time */ 332 if ((tval = mktime(lt)) == -1) 333 errx(1, "nonexistent time"); 334 335 if (!jflag) { 336 utx.ut_type = OLD_TIME; 337 memset(utx.ut_id, 0, sizeof(utx.ut_id)); 338 (void)gettimeofday(&utx.ut_tv, NULL); 339 pututxline(&utx); 340 tv.tv_sec = tval; 341 tv.tv_usec = 0; 342 if (settimeofday(&tv, NULL) != 0) 343 err(1, "settimeofday (timeval)"); 344 utx.ut_type = NEW_TIME; 345 (void)gettimeofday(&utx.ut_tv, NULL); 346 pututxline(&utx); 347 348 if ((p = getlogin()) == NULL) 349 p = "???"; 350 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 351 } 352 } 353 354 static void 355 badformat(void) 356 { 357 warnx("illegal time format"); 358 usage(); 359 } 360 361 static void 362 iso8601_usage(const char *badarg) 363 { 364 errx(1, "invalid argument '%s' for -I", badarg); 365 } 366 367 static void 368 multipleformats(void) 369 { 370 errx(1, "multiple output formats specified"); 371 } 372 373 static void 374 usage(void) 375 { 376 (void)fprintf(stderr, "%s\n%s\n%s\n", 377 "usage: date [-jnRu] [-I[date|hours|minutes|seconds]] [-f input_fmt]", 378 " " 379 "[ -z output_zone ] [-r filename|seconds] [-v[+|-]val[y|m|w|d|H|M|S]]", 380 " " 381 "[[[[[[cc]yy]mm]dd]HH]MM[.SS] | new_date] [+output_fmt]" 382 ); 383 exit(1); 384 } 385