1 /* 2 * Copyright (c) 1985, 1987, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)date.c 8.2 (Berkeley) 4/28/95 30 * $FreeBSD: src/bin/date/date.c,v 1.47 2005/01/10 08:39:21 imp Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 36 #include <ctype.h> 37 #include <err.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <syslog.h> 42 #include <unistd.h> 43 #include <locale.h> 44 #include <libutil.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 setthetime(const char *, const char *, int); 57 static void usage(void); 58 59 static const struct iso8601_fmt { 60 const char *refname; 61 const char *format; 62 } iso8601_fmts[] = { 63 { "date", "%Y-%m-%d" }, 64 { "hours", "%Y-%m-%dT%H" }, 65 { "minutes", "%Y-%m-%dT%H:%M" }, 66 { "seconds", "%Y-%m-%dT%H:%M:%S" }, 67 }; 68 static const struct iso8601_fmt *iso8601_selected; 69 70 static const char *rfc2822_format = "%a, %d %b %Y %T %z"; 71 72 int 73 main(int argc, char **argv) 74 { 75 int ch, rflag; 76 int Iflag, jflag, Rflag; 77 const char *format; 78 char buf[1024], tzbuf[8]; 79 char *fmt; 80 char *tmp; 81 struct vary *v; 82 const struct vary *badv; 83 struct tm lt; 84 size_t i; 85 86 v = NULL; 87 fmt = NULL; 88 setlocale(LC_TIME, ""); 89 rflag = 0; 90 Iflag = jflag = Rflag = 0; 91 while ((ch = getopt(argc, argv, "f:I::jnRr:uv:")) != -1) 92 switch (ch) { 93 case 'f': 94 fmt = optarg; 95 break; 96 case 'I': /* ISO 8601 datetime format */ 97 if (Rflag) 98 errx(1, "multiple output formats specified"); 99 Iflag = 1; 100 if (optarg == NULL) { 101 iso8601_selected = iso8601_fmts; 102 break; 103 } 104 for (i = 0; i < nitems(iso8601_fmts); i++) { 105 if (strncmp(optarg, iso8601_fmts[i].refname, 106 strlen(optarg)) == 0) 107 break; 108 } 109 if (i == nitems(iso8601_fmts)) 110 errx(1, "invalid argument '%s' for -I", optarg); 111 iso8601_selected = &iso8601_fmts[i]; 112 break; 113 case 'j': 114 jflag = 1; /* don't set time */ 115 break; 116 case 'n': /* don't set network */ 117 break; 118 case 'R': /* RFC 2822 datetime format */ 119 if (Iflag) 120 errx(1, "multiple output formats specified"); 121 Rflag = 1; 122 break; 123 case 'r': /* user specified seconds */ 124 rflag = 1; 125 tval = strtoll(optarg, &tmp, 0); 126 if (*tmp != 0) 127 usage(); 128 break; 129 case 'u': /* do everything in UTC */ 130 if (setenv("TZ", "UTC0", 1) != 0) 131 err(1, "setenv: cannot set TZ=UTC0"); 132 break; 133 case 'v': 134 v = vary_append(v, optarg); 135 break; 136 default: 137 usage(); 138 } 139 argc -= optind; 140 argv += optind; 141 142 if (!rflag && time(&tval) == -1) 143 err(1, "time"); 144 145 format = "%+"; 146 147 if (Rflag) 148 format = rfc2822_format; 149 if (Iflag) 150 format = iso8601_selected->format; 151 152 /* allow the operands in any order */ 153 if (*argv && **argv == '+') { 154 if (Iflag || Rflag) 155 errx(1, "multiple output formats specified"); 156 format = *argv + 1; 157 ++argv; 158 } 159 160 if (*argv) { 161 setthetime(fmt, *argv, jflag); 162 ++argv; 163 } else if (fmt != NULL) 164 usage(); 165 166 if (*argv && **argv == '+') { 167 if (Iflag || Rflag) 168 errx(1, "multiple output formats specified"); 169 format = *argv + 1; 170 } 171 172 lt = *localtime(&tval); 173 badv = vary_apply(v, <); 174 if (badv) { 175 fprintf(stderr, "%s: Cannot apply date adjustment\n", 176 badv->arg); 177 vary_destroy(v); 178 usage(); 179 } 180 vary_destroy(v); 181 182 if (format == rfc2822_format) { 183 /* 184 * When using RFC 2822 datetime format, don't honor the 185 * locale. 186 */ 187 setlocale(LC_TIME, "C"); 188 } 189 190 strftime(buf, sizeof(buf), format, <); 191 if (Iflag && iso8601_selected > iso8601_fmts) { 192 strftime(tzbuf, sizeof(tzbuf), "%z", <); 193 memmove(&tzbuf[4], &tzbuf[3], 3); 194 tzbuf[3] = ':'; 195 strlcat(buf, tzbuf, sizeof(buf)); 196 } 197 printf("%s\n", buf); 198 if (fflush(stdout) != 0) 199 err(1, "stdout"); 200 exit(EXIT_SUCCESS); 201 } 202 203 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 204 205 static void 206 setthetime(const char *fmt, const char *p, int jflag) 207 { 208 struct tm *lt; 209 struct timeval tv; 210 const char *dot, *t; 211 int century; 212 213 if (fmt != NULL) { 214 lt = localtime(&tval); 215 t = strptime(p, fmt, lt); 216 if (t == NULL) { 217 fprintf(stderr, "Failed conversion of ``%s''" 218 " using format ``%s''\n", p, fmt); 219 badformat(); 220 } else if (*t != '\0') 221 fprintf(stderr, "Warning: Ignoring %ld extraneous" 222 " characters in date string (%s)\n", 223 (long) strlen(t), t); 224 } else { 225 for (t = p, dot = NULL; *t; ++t) { 226 if (isdigit(*t)) 227 continue; 228 if (*t == '.' && dot == NULL) { 229 dot = t; 230 continue; 231 } 232 badformat(); 233 } 234 235 lt = localtime(&tval); 236 237 if (dot != NULL) { /* .ss */ 238 dot++; /* *dot++ = '\0'; */ 239 if (strlen(dot) != 2) 240 badformat(); 241 lt->tm_sec = ATOI2(dot); 242 if (lt->tm_sec > 61) 243 badformat(); 244 } else 245 lt->tm_sec = 0; 246 247 century = 0; 248 /* if p has a ".ss" field then let's pretend it's not there */ 249 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 250 case 12: /* cc */ 251 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 252 century = 1; 253 /* FALLTHROUGH */ 254 case 10: /* yy */ 255 if (century) 256 lt->tm_year += ATOI2(p); 257 else { /* hack for 2000 ;-} */ 258 lt->tm_year = ATOI2(p); 259 if (lt->tm_year < 69) 260 lt->tm_year += 2000 - TM_YEAR_BASE; 261 else 262 lt->tm_year += 1900 - TM_YEAR_BASE; 263 } 264 /* FALLTHROUGH */ 265 case 8: /* mm */ 266 lt->tm_mon = ATOI2(p); 267 if (lt->tm_mon > 12) 268 badformat(); 269 --lt->tm_mon; /* time struct is 0 - 11 */ 270 /* FALLTHROUGH */ 271 case 6: /* dd */ 272 lt->tm_mday = ATOI2(p); 273 if (lt->tm_mday > 31) 274 badformat(); 275 /* FALLTHROUGH */ 276 case 4: /* HH */ 277 lt->tm_hour = ATOI2(p); 278 if (lt->tm_hour > 23) 279 badformat(); 280 /* FALLTHROUGH */ 281 case 2: /* MM */ 282 lt->tm_min = ATOI2(p); 283 if (lt->tm_min > 59) 284 badformat(); 285 break; 286 default: 287 badformat(); 288 } 289 } 290 291 /* Let mktime() decide whether summer time is in effect. */ 292 lt->tm_isdst = -1; 293 294 /* convert broken-down time to GMT clock time */ 295 if ((tval = mktime(lt)) == -1) 296 errx(1, "nonexistent time"); 297 298 if (!jflag) { 299 logwtmpx("|", "date", "", 0, OLD_TIME); 300 tv.tv_sec = tval; 301 tv.tv_usec = 0; 302 if (settimeofday(&tv, NULL)) 303 err(1, "settimeofday (timeval)"); 304 logwtmpx("{", "date", "", 0, NEW_TIME); 305 306 if ((p = getlogin()) == NULL) 307 p = "???"; 308 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 309 } 310 } 311 312 static void 313 badformat(void) 314 { 315 warnx("illegal time format"); 316 usage(); 317 } 318 319 static void 320 usage(void) 321 { 322 fprintf(stderr, "%s\n%s\n", 323 "usage: date [-jnRu] [-r seconds] [-v[+|-]val[ymwdHMS]] ... ", 324 " " 325 "[-I [date | hours | minutes | seconds]]" 326 " " 327 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 328 exit(1); 329 } 330