lib/libalpm/backup.c

   1 /*
   2  *  backup.c
   3  *
   4  *  Copyright (c) 2005 by Judd Vinet <jvinet@zeroflux.org>
   5  *  Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
   6  *  Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
   7  *  Copyright (c) 2006 by Miklos Vajna <vmiklos@frugalware.org>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  22  *  USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 /* libalpm */
  31 #include "backup.h"
  32 #include "alpm_list.h"
  33 #include "log.h"
  34 #include "util.h"
  35
  36 /* Look for a filename in a pmpkg_t.backup list.  If we find it,
  37  * then we return the md5 or sha1 hash (parsed from the same line)
  38  */
  39 char *_alpm_needbackup(const char *file, alpm_list_t *backup)
  40 {
  41         alpm_list_t *lp;
  42
  43         ALPM_LOG_FUNC;
  44
  45         if(file == NULL || backup == NULL) {
  46                 return(NULL);
  47         }
  48
  49         /* run through the backup list and parse out the md5 or sha1 hash for our file */
  50         for(lp = backup; lp; lp = lp->next) {
  51                 char *str = strdup(lp->data);
  52                 char *ptr;
  53
  54                 /* tab delimiter */
  55                 ptr = strchr(str, '\t');
  56                 if(ptr == NULL) {
  57                         FREE(str);
  58                         continue;
  59                 }
  60                 *ptr = '\0';
  61                 ptr++;
  62                 /* now str points to the filename and ptr points to the md5 or sha1 hash */
  63                 if(strcmp(file, str) == 0) {
  64                         char *hash = strdup(ptr);
  65                         FREE(str);
  66                         return(hash);
  67                 }
  68                 FREE(str);
  69         }
  70
  71         return(NULL);
  72 }
  73
  74 /* vim: set ts=2 sw=2 noet: */