mediafire-fuse/mfshell/commands/chdir.c

/*
 * Copyright (C) 2013 Bryan Christ <bryan.christ@mediafire.com>
 *               2014 Johannes Schauer <j.schauer@email.de>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2, as published by
 * the Free Software Foundation.
 *
 * 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, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#include <stdio.h>
#include <string.h>

#include "../../mfapi/apicalls.h"
#include "../mfshell.h"
#include "../../mfapi/folder.h"
#include "../../mfapi/mfconn.h"
#include "../commands.h"        // IWYU pragma: keep

int mfshell_cmd_chdir(mfshell * mfshell, int argc, char **argv)
{
    mffolder       *folder_new;
    const char     *folder_curr;
    const char     *folder_parent;
    const char     *folderkey;
    int             retval;

    if (mfshell == NULL)
        return -1;

    if (argc != 2) {
        fprintf(stderr, "Invalid number of arguments\n");
        return -1;
    }

    folderkey = argv[1];
    if (folderkey == NULL)
        return -1;

    // change to root
    if (strcmp(folderkey, "/") == 0)
        folderkey = "myfiles";

    // user wants to navigate up a level
    if (strcmp(folderkey, "..") == 0) {
        // do several sanity checks to see if we're already at the root
        folder_curr = folder_get_key(mfshell->folder_curr);

        if (folder_curr == NULL)
            return 0;
        if (strcmp(folder_curr, "myfiles") == 0)
            return 0;

        folder_parent = folder_get_parent(mfshell->folder_curr);

        if (folder_parent == NULL)
            return 0;

        // it's pretty sure that we're not at the root
        folderkey = folder_parent;
    }
    // check the lenght of the key
    if (strlen(folderkey) != 13) {
        // as a folder moniker, "myfiles" is an exception
        if (strcmp(folderkey, "myfiles") != 0)
            return -1;
    }
    // create a new folder object to store the results
    folder_new = folder_alloc();

    // navigate to root is a special case
    if (strcmp(folderkey, "myfiles") == 0) {
        folder_set_key(folder_new, "myfiles");
        retval = 0;
    } else {
        retval = mfconn_api_folder_get_info(mfshell->conn,
                                            folder_new, (char *)folderkey);
        mfconn_update_secret_key(mfshell->conn);
    }

    if (retval == 0) {
        if (mfshell->folder_curr != NULL) {
            folder_free(mfshell->folder_curr);
            mfshell->folder_curr = NULL;
        }

        mfshell->folder_curr = folder_new;
    } else {
        folder_free(folder_new);
    }

    return retval;
}