usr.bin/at/stime.c

   1 /*      $NetBSD: stime.c,v 1.6 2008/04/05 16:26:57 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 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/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "from: @(#)touch.c       8.2 (Berkeley) 4/28/95";
  41 #endif
  42 __RCSID("$NetBSD: stime.c,v 1.6 2008/04/05 16:26:57 christos Exp $");
  43 #endif /* not lint */
  44
  45 #include <err.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <time.h>
  49 #include <tzfile.h>
  50
  51 #include "stime.h"
  52
  53 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
  54
  55 time_t
  56 stime(char *arg)
  57 {
  58         struct tm *t;
  59         time_t tmptime;
  60         int yearset;
  61         char *p;
  62                                         /* Start with the current time. */
  63         if (time(&tmptime) == (time_t)-1)
  64                 err(EXIT_FAILURE, "time");
  65
  66         if ((t = localtime(&tmptime)) == NULL)
  67                 err(EXIT_FAILURE, "localtime");
  68                                         /* [[CC]YY]MMDDhhmm[.SS] */
  69         if ((p = strchr(arg, '.')) == NULL)
  70                 t->tm_sec = 0;          /* Seconds defaults to 0. */
  71         else {
  72                 if (strlen(p + 1) != 2)
  73                         goto terr;
  74                 *p++ = '\0';
  75                 t->tm_sec = ATOI2(p);
  76         }
  77
  78         yearset = 0;
  79         switch (strlen(arg)) {
  80         case 12:                        /* CCYYMMDDhhmm */
  81                 t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
  82                 yearset = 1;
  83                 /* FALLTHROUGH */
  84         case 10:                        /* YYMMDDhhmm */
  85                 if (yearset) {
  86                         t->tm_year += ATOI2(arg);
  87                 } else {
  88                         yearset = ATOI2(arg);
  89                         t->tm_year = conv_2dig_year(yearset) - TM_YEAR_BASE;
  90                 }
  91                 /* FALLTHROUGH */
  92         case 8:                         /* MMDDhhmm */
  93                 t->tm_mon = ATOI2(arg);
  94                 --t->tm_mon;            /* Convert from 01-12 to 00-11 */
  95                 /* FALLTHROUGH */
  96         case 6:
  97                 t->tm_mday = ATOI2(arg);
  98                 /* FALLTHROUGH */
  99         case 4:
 100                 t->tm_hour = ATOI2(arg);
 101                 /* FALLTHROUGH */
 102         case 2:
 103                 t->tm_min = ATOI2(arg);
 104                 break;
 105         default:
 106                 goto terr;
 107         }
 108
 109         t->tm_isdst = -1;               /* Figure out DST. */
 110         tmptime = mktime(t);
 111         if (tmptime == (time_t)-1) {
 112  terr:          errx(EXIT_FAILURE,
 113      "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
 114         }
 115         return tmptime;
 116 }