bin/date/date.c

   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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1985, 1987, 1988, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)date.c   8.2 (Berkeley) 4/28/95
  35  * $FreeBSD: src/bin/date/date.c,v 1.47 2005/01/10 08:39:21 imp Exp $
  36  * $DragonFly: src/bin/date/date.c,v 1.14 2006/01/12 13:43:10 corecode Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41
  42 #include <ctype.h>
  43 #include <err.h>
  44 #include <langinfo.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <syslog.h>
  49 #include <unistd.h>
  50 #include <locale.h>
  51 #include <libutil.h>
  52
  53 #include "extern.h"
  54 #include "vary.h"
  55
  56 #ifndef TM_YEAR_BASE
  57 #define TM_YEAR_BASE    1900
  58 #endif
  59
  60 static time_t tval;
  61 int retval;
  62
  63 static void setthetime(const char *, const char *, int, int);
  64 static void badformat(void);
  65 static void usage(void);
  66
  67 int
  68 main(int argc, char **argv)
  69 {
  70         struct timezone tz;
  71         int ch, rflag;
  72         int jflag, nflag;
  73         const char *format;
  74         char buf[1024];
  75         char *endptr, *fmt;
  76         char *tmp;
  77         int set_timezone;
  78         struct vary *v;
  79         const struct vary *badv;
  80         struct tm lt;
  81
  82         v = NULL;
  83         fmt = NULL;
  84         setlocale(LC_TIME, "");
  85         tz.tz_dsttime = tz.tz_minuteswest = 0;
  86         rflag = 0;
  87         jflag = nflag = 0;
  88         set_timezone = 0;
  89         while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1)
  90                 switch(ch) {
  91                 case 'd':               /* daylight savings time */
  92                         tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
  93                         if (endptr == optarg || *endptr != '\0')
  94                                 usage();
  95                         set_timezone = 1;
  96                         break;
  97                 case 'f':
  98                         fmt = optarg;
  99                         break;
 100                 case 'j':
 101                         jflag = 1;      /* don't set time */
 102                         break;
 103                 case 'n':               /* don't set network */
 104                         nflag = 1;
 105                         break;
 106                 case 'r':               /* user specified seconds */
 107                         rflag = 1;
 108                         tval = strtoll(optarg, &tmp, 0);
 109                         if (*tmp != 0)
 110                                 usage();
 111                         break;
 112                 case 't':               /* minutes west of UTC */
 113                                         /* error check; don't allow "PST" */
 114                         tz.tz_minuteswest = strtol(optarg, &endptr, 10);
 115                         if (endptr == optarg || *endptr != '\0')
 116                                 usage();
 117                         set_timezone = 1;
 118                         break;
 119                 case 'u':               /* do everything in UTC */
 120                         if (setenv("TZ", "UTC0", 1) != 0)
 121                                 err(1, "setenv: cannot set TZ=UTC0");
 122                         break;
 123                 case 'v':
 124                         v = vary_append(v, optarg);
 125                         break;
 126                 default:
 127                         usage();
 128                 }
 129         argc -= optind;
 130         argv += optind;
 131
 132         /*
 133          * If -d or -t, set the timezone or daylight savings time; this
 134          * doesn't belong here; the kernel should not know about either.
 135          */
 136         if (set_timezone && settimeofday(NULL, &tz))
 137                 err(1, "settimeofday (timezone)");
 138
 139         if (!rflag && time(&tval) == -1)
 140                 err(1, "time");
 141
 142         format = nl_langinfo(_DATE_FMT);
 143
 144         /* allow the operands in any order */
 145         if (*argv && **argv == '+') {
 146                 format = *argv + 1;
 147                 ++argv;
 148         }
 149
 150         if (*argv) {
 151                 setthetime(fmt, *argv, jflag, nflag);
 152                 ++argv;
 153         } else if (fmt != NULL)
 154                 usage();
 155
 156         if (*argv && **argv == '+')
 157                 format = *argv + 1;
 158
 159         lt = *localtime(&tval);
 160         badv = vary_apply(v, &lt);
 161         if (badv) {
 162                 fprintf(stderr, "%s: Cannot apply date adjustment\n",
 163                         badv->arg);
 164                 vary_destroy(v);
 165                 usage();
 166         }
 167         vary_destroy(v);
 168         strftime(buf, sizeof(buf), format, &lt);
 169         printf("%s\n", buf);
 170         if (fflush(stdout) != 0)
 171                 err(1, "stdout");
 172         exit(retval);
 173 }
 174
 175 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 176
 177 static void
 178 setthetime(const char *fmt, const char *p, int jflag, int nflag)
 179 {
 180         struct tm *lt;
 181         struct timeval tv;
 182         const char *dot, *t;
 183         int century;
 184
 185         if (fmt != NULL) {
 186                 lt = localtime(&tval);
 187                 t = strptime(p, fmt, lt);
 188                 if (t == NULL) {
 189                         fprintf(stderr, "Failed conversion of ``%s''"
 190                                 " using format ``%s''\n", p, fmt);
 191                         badformat();
 192                 } else if (*t != '\0')
 193                         fprintf(stderr, "Warning: Ignoring %ld extraneous"
 194                                 " characters in date string (%s)\n",
 195                                 (long) strlen(t), t);
 196         } else {
 197                 for (t = p, dot = NULL; *t; ++t) {
 198                         if (isdigit(*t))
 199                                 continue;
 200                         if (*t == '.' && dot == NULL) {
 201                                 dot = t;
 202                                 continue;
 203                         }
 204                         badformat();
 205                 }
 206
 207                 lt = localtime(&tval);
 208
 209                 if (dot != NULL) {                      /* .ss */
 210                         dot++; /* *dot++ = '\0'; */
 211                         if (strlen(dot) != 2)
 212                                 badformat();
 213                         lt->tm_sec = ATOI2(dot);
 214                         if (lt->tm_sec > 61)
 215                                 badformat();
 216                 } else
 217                         lt->tm_sec = 0;
 218
 219                 century = 0;
 220                 /* if p has a ".ss" field then let's pretend it's not there */
 221                 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
 222                 case 12:                                /* cc */
 223                         lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
 224                         century = 1;
 225                         /* FALLTHROUGH */
 226                 case 10:                                /* yy */
 227                         if (century)
 228                                 lt->tm_year += ATOI2(p);
 229                         else {                          /* hack for 2000 ;-} */
 230                                 lt->tm_year = ATOI2(p);
 231                                 if (lt->tm_year < 69)
 232                                         lt->tm_year += 2000 - TM_YEAR_BASE;
 233                                 else
 234                                         lt->tm_year += 1900 - TM_YEAR_BASE;
 235                         }
 236                         /* FALLTHROUGH */
 237                 case 8:                                 /* mm */
 238                         lt->tm_mon = ATOI2(p);
 239                         if (lt->tm_mon > 12)
 240                                 badformat();
 241                         --lt->tm_mon;           /* time struct is 0 - 11 */
 242                         /* FALLTHROUGH */
 243                 case 6:                                 /* dd */
 244                         lt->tm_mday = ATOI2(p);
 245                         if (lt->tm_mday > 31)
 246                                 badformat();
 247                         /* FALLTHROUGH */
 248                 case 4:                                 /* HH */
 249                         lt->tm_hour = ATOI2(p);
 250                         if (lt->tm_hour > 23)
 251                                 badformat();
 252                         /* FALLTHROUGH */
 253                 case 2:                                 /* MM */
 254                         lt->tm_min = ATOI2(p);
 255                         if (lt->tm_min > 59)
 256                                 badformat();
 257                         break;
 258                 default:
 259                         badformat();
 260                 }
 261         }
 262
 263         /* Let mktime() decide whether summer time is in effect. */
 264         lt->tm_isdst = -1;
 265
 266         /* convert broken-down time to GMT clock time */
 267         if ((tval = mktime(lt)) == -1)
 268                 errx(1, "nonexistent time");
 269
 270         if (!jflag) {
 271                 /* set the time */
 272                 if (nflag || netsettime(tval)) {
 273                         logwtmp("|", "date", "");
 274                         tv.tv_sec = tval;
 275                         tv.tv_usec = 0;
 276                         if (settimeofday(&tv, NULL))
 277                                 err(1, "settimeofday (timeval)");
 278                         logwtmp("{", "date", "");
 279                 }
 280
 281                 if ((p = getlogin()) == NULL)
 282                         p = "???";
 283                 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
 284         }
 285 }
 286
 287 static void
 288 badformat(void)
 289 {
 290         warnx("illegal time format");
 291         usage();
 292 }
 293
 294 static void
 295 usage(void)
 296 {
 297         fprintf(stderr, "%s\n%s\n",
 298             "usage: date [-jnu] [-d dst] [-r seconds] [-t west] "
 299             "[-v[+|-]val[ymwdHMS]] ... ",
 300             "            "
 301             "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
 302         exit(1);
 303 }