backup.c

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/*
 *  backup.c
 *
 *  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 */
int _alpm_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;
        }
        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;
    _alpm_backup_split(string, &file, NULL);
    return(file);
}

char *_alpm_backup_hash(const char *string)
{
    char *hash = NULL;
    _alpm_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(!_alpm_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: */

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