2012-01-21 21:57:41 +01:00
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/*
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* unlink.c --- delete links in a ext2fs directory
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*
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* Copyright (C) 1993, 1994, 1997 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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2012-04-22 19:40:21 +02:00
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#include "config.h"
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2012-01-21 21:57:41 +01:00
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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struct link_struct {
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const char *name;
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int namelen;
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ext2_ino_t inode;
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int flags;
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struct ext2_dir_entry *prev;
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int done;
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};
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#ifdef __TURBOC__
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#pragma argsused
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#endif
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static int unlink_proc(struct ext2_dir_entry *dirent,
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int offset,
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int blocksize EXT2FS_ATTR((unused)),
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char *buf EXT2FS_ATTR((unused)),
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void *priv_data)
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{
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struct link_struct *ls = (struct link_struct *) priv_data;
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struct ext2_dir_entry *prev;
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prev = ls->prev;
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ls->prev = dirent;
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if (ls->name) {
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if ((dirent->name_len & 0xFF) != ls->namelen)
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return 0;
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if (strncmp(ls->name, dirent->name, dirent->name_len & 0xFF))
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return 0;
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}
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if (ls->inode) {
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if (dirent->inode != ls->inode)
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return 0;
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} else {
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if (!dirent->inode)
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return 0;
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}
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if (offset)
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prev->rec_len += dirent->rec_len;
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else
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dirent->inode = 0;
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ls->done++;
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return DIRENT_ABORT|DIRENT_CHANGED;
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}
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#ifdef __TURBOC__
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#pragma argsused
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#endif
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errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir,
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const char *name, ext2_ino_t ino,
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int flags EXT2FS_ATTR((unused)))
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{
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errcode_t retval;
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struct link_struct ls;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (!name && !ino)
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return EXT2_ET_INVALID_ARGUMENT;
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if (!(fs->flags & EXT2_FLAG_RW))
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return EXT2_ET_RO_FILSYS;
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ls.name = name;
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ls.namelen = name ? strlen(name) : 0;
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ls.inode = ino;
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ls.flags = 0;
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ls.done = 0;
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ls.prev = 0;
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retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY,
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0, unlink_proc, &ls);
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if (retval)
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return retval;
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return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE;
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}
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