lookup.c revision d1154eb460efe588eaed3d439c1caaca149fa362 
1/*
2 * lookup.c --- ext2fs directory lookup operations
3 *
4 * Copyright (C) 1993, 1994, 1994, 1995 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12#include "config.h"
13#include <stdio.h>
14#include <string.h>
15#if HAVE_UNISTD_H
16#include <unistd.h>
17#endif
18
19#include "ext2_fs.h"
20#include "ext2fs.h"
21
22struct lookup_struct  {
23	const char	*name;
24	int		len;
25	ext2_ino_t	*inode;
26	int		found;
27};
28
29#ifdef __TURBOC__
30 #pragma argsused
31#endif
32static int lookup_proc(struct ext2_dir_entry *dirent,
33		       int	offset EXT2FS_ATTR((unused)),
34		       int	blocksize EXT2FS_ATTR((unused)),
35		       char	*buf EXT2FS_ATTR((unused)),
36		       void	*priv_data)
37{
38	struct lookup_struct *ls = (struct lookup_struct *) priv_data;
39
40	if (ls->len != (dirent->name_len & 0xFF))
41		return 0;
42	if (strncmp(ls->name, dirent->name, (dirent->name_len & 0xFF)))
43		return 0;
44	*ls->inode = dirent->inode;
45	ls->found++;
46	return DIRENT_ABORT;
47}
48
49
50errcode_t ext2fs_lookup(ext2_filsys fs, ext2_ino_t dir, const char *name,
51			int namelen, char *buf, ext2_ino_t *inode)
52{
53	errcode_t	retval;
54	struct lookup_struct ls;
55
56	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
57
58	ls.name = name;
59	ls.len = namelen;
60	ls.inode = inode;
61	ls.found = 0;
62
63	retval = ext2fs_dir_iterate(fs, dir, 0, buf, lookup_proc, &ls);
64	if (retval)
65		return retval;
66
67	return (ls.found) ? 0 : EXT2_ET_FILE_NOT_FOUND;
68}
69
70
71