lib/libalpm/backup.c


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/*
 *  backup.c
 *
 *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2005 by Judd Vinet <jvinet@zeroflux.org>
 *  Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
 *  Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
 *  Copyright (c) 2006 by Miklos Vajna <vmiklos@frugalware.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdlib.h>
#include <string.h>

/* libalpm */
#include "backup.h"
#include "alpm_list.h"
#include "log.h"
#include "util.h"

/* split a backup string "file\thash" into two strings : file and hash */
static int backup_split(const char *string, char **file, char **hash)
{
  char *str = strdup(string);
  char *ptr;

  /* tab delimiter */
  ptr = strchr(str, '\t');
  if(ptr == NULL) {
    if(file) {
      *file = str;
    } else {
      /* don't need our dup as the fname wasn't requested, so free it */
      FREE(str);
    }
    return 0;
  }
  *ptr = '\0';
  ptr++;
  /* now str points to the filename and ptr points to the hash */
  if(file) {
    *file = strdup(str);
  }
  if(hash) {
    *hash = strdup(ptr);
  }
  FREE(str);
  return 1;
}

char *_alpm_backup_file(const char *string)
{
  char *file = NULL;
  backup_split(string, &file, NULL);
  return file;
}

char *_alpm_backup_hash(const char *string)
{
  char *hash = NULL;
  backup_split(string, NULL, &hash);
  return hash;
}

/* Look for a filename in a pmpkg_t.backup list.  If we find it,
 * then we return the md5 hash (parsed from the same line)
 */
char *_alpm_needbackup(const char *file, const alpm_list_t *backup)
{
  const alpm_list_t *lp;

  ALPM_LOG_FUNC;

  if(file == NULL || backup == NULL) {
    return NULL;
  }

  /* run through the backup list and parse out the hash for our file */
  for(lp = backup; lp; lp = lp->next) {
    char *filename = NULL;
    char *hash = NULL;

    /* no hash found */
    if(!backup_split((char *)lp->data, &filename, &hash)) {
      FREE(filename);
      continue;
    }
    if(strcmp(file, filename) == 0) {
      FREE(filename);
      return hash;
    }
    FREE(filename);
    FREE(hash);
  }

  return NULL;
}

/* vim: set ts=2 sw=2 noet: */