blob: 2bb1cc25ec93f293de960c68b5232b3ba28e0264
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * get_pathname.c --- do directry/inode -> name translation |
4 | * |
5 | * Copyright (C) 1993, 1994, 1995 Theodore Ts'o. |
6 | * |
7 | * %Begin-Header% |
8 | * This file may be redistributed under the terms of the GNU Public |
9 | * License. |
10 | * %End-Header% |
11 | * |
12 | * ext2fs_get_pathname(fs, dir, ino, name) |
13 | * |
14 | * This function translates takes two inode numbers into a |
15 | * string, placing the result in <name>. <dir> is the containing |
16 | * directory inode, and <ino> is the inode number itself. If |
17 | * <ino> is zero, then ext2fs_get_pathname will return pathname |
18 | * of the directory <dir>. |
19 | * |
20 | */ |
21 | |
22 | #include <stdio.h> |
23 | #include <string.h> |
24 | #if HAVE_UNISTD_H |
25 | #include <unistd.h> |
26 | #endif |
27 | |
28 | #include "ext2_fs.h" |
29 | #include "ext2fs.h" |
30 | |
31 | struct get_pathname_struct { |
32 | ext2_ino_t search_ino; |
33 | ext2_ino_t parent; |
34 | char *name; |
35 | errcode_t errcode; |
36 | }; |
37 | |
38 | #ifdef __TURBOC__ |
39 | # pragma argsused |
40 | #endif |
41 | static int get_pathname_proc(struct ext2_dir_entry *dirent, |
42 | int offset EXT2FS_ATTR((unused)), |
43 | int blocksize EXT2FS_ATTR((unused)), |
44 | char *buf EXT2FS_ATTR((unused)), |
45 | void *priv_data) |
46 | { |
47 | struct get_pathname_struct *gp; |
48 | errcode_t retval; |
49 | |
50 | gp = (struct get_pathname_struct *) priv_data; |
51 | |
52 | if (((dirent->name_len & 0xFF) == 2) && |
53 | !strncmp(dirent->name, "..", 2)) |
54 | gp->parent = dirent->inode; |
55 | if (dirent->inode == gp->search_ino) { |
56 | retval = ext2fs_get_mem((dirent->name_len & 0xFF) + 1, |
57 | &gp->name); |
58 | if (retval) { |
59 | gp->errcode = retval; |
60 | return DIRENT_ABORT; |
61 | } |
62 | strncpy(gp->name, dirent->name, (dirent->name_len & 0xFF)); |
63 | gp->name[dirent->name_len & 0xFF] = '\0'; |
64 | return DIRENT_ABORT; |
65 | } |
66 | return 0; |
67 | } |
68 | |
69 | static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ext2_ino_t dir, |
70 | ext2_ino_t ino, int maxdepth, |
71 | char *buf, char **name) |
72 | { |
73 | struct get_pathname_struct gp; |
74 | char *parent_name, *ret; |
75 | errcode_t retval; |
76 | |
77 | if (dir == ino) { |
78 | retval = ext2fs_get_mem(2, name); |
79 | if (retval) |
80 | return retval; |
81 | strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : "."); |
82 | return 0; |
83 | } |
84 | |
85 | if (!dir || (maxdepth < 0)) { |
86 | retval = ext2fs_get_mem(4, name); |
87 | if (retval) |
88 | return retval; |
89 | strcpy(*name, "..."); |
90 | return 0; |
91 | } |
92 | |
93 | gp.search_ino = ino; |
94 | gp.parent = 0; |
95 | gp.name = 0; |
96 | gp.errcode = 0; |
97 | |
98 | retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp); |
99 | if (retval) |
100 | goto cleanup; |
101 | if (gp.errcode) { |
102 | retval = gp.errcode; |
103 | goto cleanup; |
104 | } |
105 | |
106 | retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1, |
107 | buf, &parent_name); |
108 | if (retval) |
109 | goto cleanup; |
110 | if (!ino) { |
111 | *name = parent_name; |
112 | return 0; |
113 | } |
114 | |
115 | if (gp.name) |
116 | retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2, |
117 | &ret); |
118 | else |
119 | retval = ext2fs_get_mem(strlen(parent_name)+5, &ret); |
120 | if (retval) |
121 | goto cleanup; |
122 | |
123 | ret[0] = 0; |
124 | if (parent_name[1]) |
125 | strcat(ret, parent_name); |
126 | strcat(ret, "/"); |
127 | if (gp.name) |
128 | strcat(ret, gp.name); |
129 | else |
130 | strcat(ret, "???"); |
131 | *name = ret; |
132 | ext2fs_free_mem(&parent_name); |
133 | retval = 0; |
134 | |
135 | cleanup: |
136 | ext2fs_free_mem(&gp.name); |
137 | return retval; |
138 | } |
139 | |
140 | errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino, |
141 | char **name) |
142 | { |
143 | char *buf; |
144 | errcode_t retval; |
145 | |
146 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
147 | |
148 | retval = ext2fs_get_mem(fs->blocksize, &buf); |
149 | if (retval) |
150 | return retval; |
151 | if (dir == ino) |
152 | ino = 0; |
153 | retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name); |
154 | ext2fs_free_mem(&buf); |
155 | return retval; |
156 | } |
157 |