busybox

/* vi: set sw=4 ts=4: */

/*

 * link.c --- create links in a ext2fs directory

 *

 * Copyright (C) 1993, 1994 Theodore Ts'o.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Public

 * License.

 * %End-Header%

 */

​

#include <stdio.h>

#include <string.h>

#if HAVE_UNISTD_H

#include <unistd.h>

#endif

​

#include "ext2_fs.h"

#include "ext2fs.h"

​

struct link_struct  {

    const char  *name;

    int     namelen;

    ext2_ino_t  inode;

    int     flags;

    int     done;

    struct ext2_super_block *sb;

};

​

static int link_proc(struct ext2_dir_entry *dirent,

             int    offset,

             int    blocksize,

             char   *buf,

             void   *priv_data)

{

    struct link_struct *ls = (struct link_struct *) priv_data;

    struct ext2_dir_entry *next;

    int rec_len, min_rec_len;

    int ret = 0;

​

    rec_len = EXT2_DIR_REC_LEN(ls->namelen);

​

    /*

     * See if the following directory entry (if any) is unused;

     * if so, absorb it into this one.

     */

    next = (struct ext2_dir_entry *) (buf + offset + dirent->rec_len);

    if ((offset + dirent->rec_len < blocksize - 8) &&

        (next->inode == 0) &&

        (offset + dirent->rec_len + next->rec_len <= blocksize)) {

        dirent->rec_len += next->rec_len;

        ret = DIRENT_CHANGED;

    }

​

    /*

     * If the directory entry is used, see if we can split the

     * directory entry to make room for the new name.  If so,

     * truncate it and return.

     */

    if (dirent->inode) {

        min_rec_len = EXT2_DIR_REC_LEN(dirent->name_len & 0xFF);

        if (dirent->rec_len < (min_rec_len + rec_len))