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. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] =
  44         "$Id: unctime.c,v 1.15 2003/03/06 14:35:51 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <config.h>
  48 #include <sys/time.h>
  49 #include <time.h>
  50 #ifdef __STDC__
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #endif
  54
  55 #include <sys/param.h>
  56 #include <stdio.h>
  57
  58 #ifdef __linux__
  59 #ifdef HAVE_EXT2FS_EXT2_FS_H
  60 #include <ext2fs/ext2_fs.h>
  61 #else
  62 #include <linux/ext2_fs.h>
  63 #endif
  64 #include <ext2fs/ext2fs.h>
  65 #include <bsdcompat.h>
  66 #endif
  67
  68 #include "dump.h"
  69
  70 /*
  71  * Convert a ctime(3) format string into a system format date.
  72  * Return the date thus calculated.
  73  *
  74  * Return -1 if the string is not in ctime format.
  75  */
  76
  77 /*
  78  * Offsets into the ctime string to various parts.
  79  */
  80
  81 #define E_MONTH         4
  82 #define E_DAY           8
  83 #define E_HOUR          11
  84 #define E_MINUTE        14
  85 #define E_SECOND        17
  86 #define E_YEAR          20
  87 #define E_TZOFFSET      25
  88
  89 static  int lookup __P((const char *));
  90
  91
  92 time_t
  93 unctime(const char *str)
  94 {
  95         struct tm then;
  96         char dbuf[32];
  97         time_t rtime;
  98         int tzoffset;
  99
 100         (void) strncpy(dbuf, str, sizeof(dbuf) - 1);
 101         dbuf[sizeof(dbuf) - 1] = '\0';
 102         dbuf[E_MONTH+3] = '\0';
 103         if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0)
 104                 return (-1);
 105         then.tm_mday = atoi(&dbuf[E_DAY]);
 106         then.tm_hour = atoi(&dbuf[E_HOUR]);
 107         then.tm_min = atoi(&dbuf[E_MINUTE]);
 108         then.tm_sec = atoi(&dbuf[E_SECOND]);
 109         then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
 110         then.tm_isdst = -1;
 111         if (strlen(str) >= E_TZOFFSET+5) {
 112                 rtime = timegm(&then);
 113                 /* add timezone offset */
 114                 tzoffset = atoi(&dbuf[E_TZOFFSET]);
 115                 rtime -= (tzoffset / 100 * 3600) + (tzoffset % 100) * 60;
 116         } else {
 117                 rtime = timelocal(&then);
 118         }
 119         return(rtime);
 120 }
 121
 122 static char months[] =
 123         "JanFebMarAprMayJunJulAugSepOctNovDec";
 124
 125 static int
 126 lookup(const char *str)
 127 {
 128         const char *cp, *cp2;
 129
 130         for (cp = months, cp2 = str; *cp != '\0'; cp += 3)
 131                 if (strncmp(cp, cp2, 3) == 0)
 132                         return((cp-months) / 3);
 133         return(-1);
 134 }