1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/* vi: set sw=4 ts=4: */
/*
* get_pathname.c --- do directry/inode -> name translation
*
* Copyright (C) 1993, 1994, 1995 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*
* ext2fs_get_pathname(fs, dir, ino, name)
*
* This function translates takes two inode numbers into a
* string, placing the result in <name>. <dir> is the containing
* directory inode, and <ino> is the inode number itself. If
* <ino> is zero, then ext2fs_get_pathname will return pathname
* of the the directory <dir>.
*
*/
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "ext2_fs.h"
#include "ext2fs.h"
struct get_pathname_struct {
ext2_ino_t search_ino;
ext2_ino_t parent;
char *name;
errcode_t errcode;
};
#ifdef __TURBOC__
# pragma argsused
#endif
static int get_pathname_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 get_pathname_struct *gp;
errcode_t retval;
gp = (struct get_pathname_struct *) priv_data;
if (((dirent->name_len & 0xFF) == 2) &&
!strncmp(dirent->name, "..", 2))
gp->parent = dirent->inode;
if (dirent->inode == gp->search_ino) {
retval = ext2fs_get_mem((dirent->name_len & 0xFF) + 1,
&gp->name);
if (retval) {
gp->errcode = retval;
return DIRENT_ABORT;
}
strncpy(gp->name, dirent->name, (dirent->name_len & 0xFF));
gp->name[dirent->name_len & 0xFF] = '\0';
return DIRENT_ABORT;
}
return 0;
}
static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ext2_ino_t dir,
ext2_ino_t ino, int maxdepth,
char *buf, char **name)
{
struct get_pathname_struct gp;
char *parent_name, *ret;
errcode_t retval;
if (dir == ino) {
retval = ext2fs_get_mem(2, name);
if (retval)
return retval;
strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : ".");
return 0;
}
if (!dir || (maxdepth < 0)) {
retval = ext2fs_get_mem(4, name);
if (retval)
return retval;
strcpy(*name, "...");
return 0;
}
gp.search_ino = ino;
gp.parent = 0;
gp.name = 0;
gp.errcode = 0;
retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp);
if (retval)
goto cleanup;
if (gp.errcode) {
retval = gp.errcode;
goto cleanup;
}
retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1,
buf, &parent_name);
if (retval)
goto cleanup;
if (!ino) {
*name = parent_name;
return 0;
}
if (gp.name)
retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2,
&ret);
else
retval = ext2fs_get_mem(strlen(parent_name)+5, &ret);
if (retval)
goto cleanup;
ret[0] = 0;
if (parent_name[1])
strcat(ret, parent_name);
strcat(ret, "/");
if (gp.name)
strcat(ret, gp.name);
else
strcat(ret, "???");
*name = ret;
ext2fs_free_mem(&parent_name);
retval = 0;
cleanup:
ext2fs_free_mem(&gp.name);
return retval;
}
errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino,
char **name)
{
char *buf;
errcode_t retval;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
retval = ext2fs_get_mem(fs->blocksize, &buf);
if (retval)
return retval;
if (dir == ino)
ino = 0;
retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name);
ext2fs_free_mem(&buf);
return retval;
}
|
