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. 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  * @(#) Copyright (c) 1985, 1987, 1988, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)date.c   8.2 (Berkeley) 4/28/95
  31  * $FreeBSD: src/bin/date/date.c,v 1.47 2005/01/10 08:39:21 imp Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/time.h>
  36
  37 #include <ctype.h>
  38 #include <err.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <syslog.h>
  43 #include <unistd.h>
  44 #include <locale.h>
  45 #include <libutil.h>
  46
  47 #include "extern.h"
  48 #include "vary.h"
  49
  50 #ifndef TM_YEAR_BASE
  51 #define TM_YEAR_BASE    1900
  52 #endif
  53
  54 static time_t tval;
  55 int retval;
  56
  57 static void setthetime(const char *, const char *, int, int);
  58 static void badformat(void);
  59 static void usage(void);
  60
  61 static const char *rfc2822_format ="%a, %d %b %Y %T %z";
  62
  63 int
  64 main(int argc, char **argv)
  65 {
  66         struct timezone tz;
  67         int ch, rflag;
  68         int jflag, nflag, Rflag;
  69         const char *format;
  70         char buf[1024];
  71         char *endptr, *fmt;
  72         char *tmp;
  73         int set_timezone;
  74         struct vary *v;
  75         const struct vary *badv;
  76         struct tm lt;
  77
  78         v = NULL;
  79         fmt = NULL;
  80         setlocale(LC_TIME, "");
  81         tz.tz_dsttime = tz.tz_minuteswest = 0;
  82         rflag = 0;
  83         jflag = nflag = Rflag = 0;
  84         set_timezone = 0;
  85         while ((ch = getopt(argc, argv, "d:f:jnRr:t:uv:")) != -1)
  86                 switch(ch) {
  87                 case 'd':               /* daylight savings time */
  88                         tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
  89                         if (endptr == optarg || *endptr != '\0')
  90                                 usage();
  91                         set_timezone = 1;
  92                         break;
  93                 case 'f':
  94                         fmt = optarg;
  95                         break;
  96                 case 'j':
  97                         jflag = 1;      /* don't set time */
  98                         break;
  99                 case 'n':               /* don't set network */
 100                         nflag = 1;
 101                         break;
 102                 case 'R':
 103                         Rflag = 1;      /*RFC 2822 datetime format */
 104                         break;
 105                 case 'r':               /* user specified seconds */
 106                         rflag = 1;
 107                         tval = strtoll(optarg, &tmp, 0);
 108                         if (*tmp != 0)
 109                                 usage();
 110                         break;
 111                 case 't':               /* minutes west of UTC */
 112                                         /* error check; don't allow "PST" */
 113                         tz.tz_minuteswest = strtol(optarg, &endptr, 10);
 114                         if (endptr == optarg || *endptr != '\0')
 115                                 usage();
 116                         set_timezone = 1;
 117                         break;
 118                 case 'u':               /* do everything in UTC */
 119                         if (setenv("TZ", "UTC0", 1) != 0)
 120                                 err(1, "setenv: cannot set TZ=UTC0");
 121                         break;
 122                 case 'v':
 123                         v = vary_append(v, optarg);
 124                         break;
 125                 default:
 126                         usage();
 127                 }
 128         argc -= optind;
 129         argv += optind;
 130
 131         /*
 132          * If -d or -t, set the timezone or daylight savings time; this
 133          * doesn't belong here; the kernel should not know about either.
 134          */
 135         if (set_timezone && settimeofday(NULL, &tz))
 136                 err(1, "settimeofday (timezone)");
 137
 138         if (!rflag && time(&tval) == -1)
 139                 err(1, "time");
 140
 141         format = "%+";
 142
 143         if (Rflag)
 144                 format = rfc2822_format;
 145
 146         /* allow the operands in any order */
 147         if (*argv && **argv == '+') {
 148                 format = *argv + 1;
 149                 ++argv;
 150         }
 151
 152         if (*argv) {
 153                 setthetime(fmt, *argv, jflag, nflag);
 154                 ++argv;
 155         } else if (fmt != NULL)
 156                 usage();
 157
 158         if (*argv && **argv == '+')
 159                 format = *argv + 1;
 160
 161         lt = *localtime(&tval);
 162         badv = vary_apply(v, &lt);
 163         if (badv) {
 164                 fprintf(stderr, "%s: Cannot apply date adjustment\n",
 165                         badv->arg);
 166                 vary_destroy(v);
 167                 usage();
 168         }
 169         vary_destroy(v);
 170
 171         if (format == rfc2822_format) {
 172                 /*
 173                  * When using RFC 2822 datetime format, don't honor the
 174                  * locale.
 175                  */
 176                 setlocale(LC_TIME, "C");
 177         }
 178
 179         strftime(buf, sizeof(buf), format, &lt);
 180         printf("%s\n", buf);
 181         if (fflush(stdout) != 0)
 182                 err(1, "stdout");
 183         exit(retval);
 184 }
 185
 186 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 187
 188 static void
 189 setthetime(const char *fmt, const char *p, int jflag, int nflag)
 190 {
 191         struct tm *lt;
 192         struct timeval tv;
 193         const char *dot, *t;
 194         int century;
 195
 196         if (fmt != NULL) {
 197                 lt = localtime(&tval);
 198                 t = strptime(p, fmt, lt);
 199                 if (t == NULL) {
 200                         fprintf(stderr, "Failed conversion of ``%s''"
 201                                 " using format ``%s''\n", p, fmt);
 202                         badformat();
 203                 } else if (*t != '\0')
 204                         fprintf(stderr, "Warning: Ignoring %ld extraneous"
 205                                 " characters in date string (%s)\n",
 206                                 (long) strlen(t), t);
 207         } else {
 208                 for (t = p, dot = NULL; *t; ++t) {
 209                         if (isdigit(*t))
 210                                 continue;
 211                         if (*t == '.' && dot == NULL) {
 212                                 dot = t;
 213                                 continue;
 214                         }
 215                         badformat();
 216                 }
 217
 218                 lt = localtime(&tval);
 219
 220                 if (dot != NULL) {                      /* .ss */
 221                         dot++; /* *dot++ = '\0'; */
 222                         if (strlen(dot) != 2)
 223                                 badformat();
 224                         lt->tm_sec = ATOI2(dot);
 225                         if (lt->tm_sec > 61)
 226                                 badformat();
 227                 } else
 228                         lt->tm_sec = 0;
 229
 230                 century = 0;
 231                 /* if p has a ".ss" field then let's pretend it's not there */
 232                 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
 233                 case 12:                                /* cc */
 234                         lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
 235                         century = 1;
 236                         /* FALLTHROUGH */
 237                 case 10:                                /* yy */
 238                         if (century)
 239                                 lt->tm_year += ATOI2(p);
 240                         else {                          /* hack for 2000 ;-} */
 241                                 lt->tm_year = ATOI2(p);
 242                                 if (lt->tm_year < 69)
 243                                         lt->tm_year += 2000 - TM_YEAR_BASE;
 244                                 else
 245                                         lt->tm_year += 1900 - TM_YEAR_BASE;
 246                         }
 247                         /* FALLTHROUGH */
 248                 case 8:                                 /* mm */
 249                         lt->tm_mon = ATOI2(p);
 250                         if (lt->tm_mon > 12)
 251                                 badformat();
 252                         --lt->tm_mon;           /* time struct is 0 - 11 */
 253                         /* FALLTHROUGH */
 254                 case 6:                                 /* dd */
 255                         lt->tm_mday = ATOI2(p);
 256                         if (lt->tm_mday > 31)
 257                                 badformat();
 258                         /* FALLTHROUGH */
 259                 case 4:                                 /* HH */
 260                         lt->tm_hour = ATOI2(p);
 261                         if (lt->tm_hour > 23)
 262                                 badformat();
 263                         /* FALLTHROUGH */
 264                 case 2:                                 /* MM */
 265                         lt->tm_min = ATOI2(p);
 266                         if (lt->tm_min > 59)
 267                                 badformat();
 268                         break;
 269                 default:
 270                         badformat();
 271                 }
 272         }
 273
 274         /* Let mktime() decide whether summer time is in effect. */
 275         lt->tm_isdst = -1;
 276
 277         /* convert broken-down time to GMT clock time */
 278         if ((tval = mktime(lt)) == -1)
 279                 errx(1, "nonexistent time");
 280
 281         if (!jflag) {
 282                 /* set the time */
 283                 if (nflag || netsettime(tval)) {
 284                         logwtmp("|", "date", "");
 285                         tv.tv_sec = tval;
 286                         tv.tv_usec = 0;
 287                         if (settimeofday(&tv, NULL))
 288                                 err(1, "settimeofday (timeval)");
 289                         logwtmp("{", "date", "");
 290                 }
 291
 292                 if ((p = getlogin()) == NULL)
 293                         p = "???";
 294                 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
 295         }
 296 }
 297
 298 static void
 299 badformat(void)
 300 {
 301         warnx("illegal time format");
 302         usage();
 303 }
 304
 305 static void
 306 usage(void)
 307 {
 308         fprintf(stderr, "%s\n%s\n",
 309             "usage: date [-jnRu] [-d dst] [-r seconds] [-t west] "
 310             "[-v[+|-]val[ymwdHMS]] ... ",
 311             "            "
 312             "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
 313         exit(1);
 314 }