dump/unctime.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <stelian@popies.net>, 1999-2000
   6  *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
   7  */
   8
   9 /*-
  10  * Copyright (c) 1980, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #ifndef lint
  39 static const char rcsid[] =
  40         "$Id: unctime.c,v 1.16 2003/03/30 15:40:37 stelian Exp $";
  41 #endif /* not lint */
  42
  43 #include <config.h>
  44 #include <sys/time.h>
  45 #include <time.h>
  46 #ifdef __STDC__
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #endif
  50
  51 #include <sys/param.h>
  52 #include <stdio.h>
  53
  54 #ifdef __linux__
  55 #ifdef HAVE_EXT2FS_EXT2_FS_H
  56 #include <ext2fs/ext2_fs.h>
  57 #else
  58 #include <linux/ext2_fs.h>
  59 #endif
  60 #include <ext2fs/ext2fs.h>
  61 #include <bsdcompat.h>
  62 #endif
  63
  64 #include "dump.h"
  65
  66 /*
  67  * Convert a ctime(3) format string into a system format date.
  68  * Return the date thus calculated.
  69  *
  70  * Return -1 if the string is not in ctime format.
  71  */
  72
  73 /*
  74  * Offsets into the ctime string to various parts.
  75  */
  76
  77 #define E_MONTH         4
  78 #define E_DAY           8
  79 #define E_HOUR          11
  80 #define E_MINUTE        14
  81 #define E_SECOND        17
  82 #define E_YEAR          20
  83 #define E_TZOFFSET      25
  84
  85 static  int lookup __P((const char *));
  86
  87
  88 time_t
  89 unctime(const char *str)
  90 {
  91         struct tm then;
  92         char dbuf[32];
  93         time_t rtime;
  94         int tzoffset;
  95
  96         (void) strncpy(dbuf, str, sizeof(dbuf) - 1);
  97         dbuf[sizeof(dbuf) - 1] = '\0';
  98         dbuf[E_MONTH+3] = '\0';
  99         if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0)
 100                 return (-1);
 101         then.tm_mday = atoi(&dbuf[E_DAY]);
 102         then.tm_hour = atoi(&dbuf[E_HOUR]);
 103         then.tm_min = atoi(&dbuf[E_MINUTE]);
 104         then.tm_sec = atoi(&dbuf[E_SECOND]);
 105         then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
 106         then.tm_isdst = -1;
 107         if (strlen(str) >= E_TZOFFSET+5) {
 108                 rtime = timegm(&then);
 109                 /* add timezone offset */
 110                 tzoffset = atoi(&dbuf[E_TZOFFSET]);
 111                 rtime -= (tzoffset / 100 * 3600) + (tzoffset % 100) * 60;
 112         } else {
 113                 rtime = timelocal(&then);
 114         }
 115         return(rtime);
 116 }
 117
 118 static char months[] =
 119         "JanFebMarAprMayJunJulAugSepOctNovDec";
 120
 121 static int
 122 lookup(const char *str)
 123 {
 124         const char *cp, *cp2;
 125
 126         for (cp = months, cp2 = str; *cp != '\0'; cp += 3)
 127                 if (strncmp(cp, cp2, 3) == 0)
 128                         return((cp-months) / 3);
 129         return(-1);
 130 }