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/*
* unlink.c --- delete links in a ext2fs directory
*
* Copyright (C) 1993, 1994, 1997 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;
struct ext2_dir_entry *prev;
int done;
};
#ifdef __TURBOC__
#pragma argsused
#endif
static int unlink_proc(struct ext2_dir_entry *dirent,
int offset EXT2FS_ATTR((unused)),
int blocksize EXT2FS_ATTR((unused)),
char *buf EXT2FS_ATTR((unused)),
void *priv_data)
{
struct link_struct *ls = (struct link_struct *) priv_data;
struct ext2_dir_entry *prev;
prev = ls->prev;
ls->prev = dirent;
if (ls->name) {
if ((dirent->name_len & 0xFF) != ls->namelen)
return 0;
if (strncmp(ls->name, dirent->name, dirent->name_len & 0xFF))
return 0;
}
if (ls->inode) {
if (dirent->inode != ls->inode)
return 0;
} else {
if (!dirent->inode)
return 0;
}
if (prev)
prev->rec_len += dirent->rec_len;
else
dirent->inode = 0;
ls->done++;
return DIRENT_ABORT|DIRENT_CHANGED;
}
#ifdef __TURBOC__
#pragma argsused
#endif
errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir,
const char *name, ext2_ino_t ino,
int flags EXT2FS_ATTR((unused)))
{
errcode_t retval;
struct link_struct ls;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!name && !ino)
return EXT2_ET_INVALID_ARGUMENT;
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
ls.name = name;
ls.namelen = name ? strlen(name) : 0;
ls.inode = ino;
ls.flags = 0;
ls.done = 0;
ls.prev = 0;
retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY,
0, unlink_proc, &ls);
if (retval)
return retval;
return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE;
}
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