1/*
2 * get_pathname.c --- do directry/inode -> name translation
3 *
4 * Copyright (C) 1993, 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/*
13 *
14 * 	ext2fs_get_pathname(fs, dir, ino, name)
15 *
16 * 	This function translates takes two inode numbers into a
17 * 	string, placing the result in <name>.  <dir> is the containing
18 * 	directory inode, and <ino> is the inode number itself.  If
19 * 	<ino> is zero, then ext2fs_get_pathname will return pathname
20 * 	of the the directory <dir>.
21 *
22 */
23
24#include <stdio.h>
25#include <string.h>
26#if HAVE_UNISTD_H
27#include <unistd.h>
28#endif
29
30#include "ext2_fs.h"
31#include "ext2fs.h"
32
33struct get_pathname_struct {
34	ext2_ino_t	search_ino;
35	ext2_ino_t	parent;
36	char		*name;
37	errcode_t	errcode;
38};
39
40#ifdef __TURBOC__
41 #pragma argsused
42#endif
43static int get_pathname_proc(struct ext2_dir_entry *dirent,
44			     int	offset EXT2FS_ATTR((unused)),
45			     int	blocksize EXT2FS_ATTR((unused)),
46			     char	*buf EXT2FS_ATTR((unused)),
47			     void	*priv_data)
48{
49	struct get_pathname_struct	*gp;
50	errcode_t			retval;
51
52	gp = (struct get_pathname_struct *) priv_data;
53
54	if (((dirent->name_len & 0xFF) == 2) &&
55	    !strncmp(dirent->name, "..", 2))
56		gp->parent = dirent->inode;
57	if (dirent->inode == gp->search_ino) {
58		retval = ext2fs_get_mem((dirent->name_len & 0xFF) + 1,
59					&gp->name);
60		if (retval) {
61			gp->errcode = retval;
62			return DIRENT_ABORT;
63		}
64		strncpy(gp->name, dirent->name, (dirent->name_len & 0xFF));
65		gp->name[dirent->name_len & 0xFF] = '\0';
66		return DIRENT_ABORT;
67	}
68	return 0;
69}
70
71static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ext2_ino_t dir,
72					 ext2_ino_t ino, int maxdepth,
73					 char *buf, char **name)
74{
75	struct get_pathname_struct gp;
76	char	*parent_name = 0, *ret;
77	errcode_t	retval;
78
79	if (dir == ino) {
80		retval = ext2fs_get_mem(2, name);
81		if (retval)
82			return retval;
83		strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : ".");
84		return 0;
85	}
86
87	if (!dir || (maxdepth < 0)) {
88		retval = ext2fs_get_mem(4, name);
89		if (retval)
90			return retval;
91		strcpy(*name, "...");
92		return 0;
93	}
94
95	gp.search_ino = ino;
96	gp.parent = 0;
97	gp.name = 0;
98	gp.errcode = 0;
99
100	retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp);
101	if (retval == EXT2_ET_NO_DIRECTORY) {
102		char tmp[32];
103
104		if (ino)
105			snprintf(tmp, sizeof(tmp), "<%u>/<%u>", dir, ino);
106		else
107			snprintf(tmp, sizeof(tmp), "<%u>", dir);
108		retval = ext2fs_get_mem(strlen(tmp)+1, name);
109		if (retval)
110			goto cleanup;
111		strcpy(*name, tmp);
112		return 0;
113	} else if (retval)
114		goto cleanup;
115	if (gp.errcode) {
116		retval = gp.errcode;
117		goto cleanup;
118	}
119
120	retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1,
121					 buf, &parent_name);
122	if (retval)
123		goto cleanup;
124	if (!ino) {
125		*name = parent_name;
126		return 0;
127	}
128
129	if (gp.name)
130		retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2,
131					&ret);
132	else
133		retval = ext2fs_get_mem(strlen(parent_name)+5, &ret);
134	if (retval)
135		goto cleanup;
136
137	ret[0] = 0;
138	if (parent_name[1])
139		strcat(ret, parent_name);
140	strcat(ret, "/");
141	if (gp.name)
142		strcat(ret, gp.name);
143	else
144		strcat(ret, "???");
145	*name = ret;
146	retval = 0;
147
148cleanup:
149	ext2fs_free_mem(&parent_name);
150	ext2fs_free_mem(&gp.name);
151	return retval;
152}
153
154errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino,
155			      char **name)
156{
157	char	*buf;
158	errcode_t	retval;
159
160	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
161
162	retval = ext2fs_get_mem(fs->blocksize, &buf);
163	if (retval)
164		return retval;
165	if (dir == ino)
166		ino = 0;
167	retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name);
168	ext2fs_free_mem(&buf);
169	return retval;
170
171}
172