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 Public
8 * License.
9 * %End-Header%
10 *
11 * ext2fs_get_pathname(fs, dir, ino, name)
12 *
13 * This function translates takes two inode numbers into a
14 * string, placing the result in <name>. <dir> is the containing
15 * directory inode, and <ino> is the inode number itself. If
16 * <ino> is zero, then ext2fs_get_pathname will return pathname
17 * of the the directory <dir>.
18 *
19 */
20
21 #include <stdio.h>
22 #include <string.h>
23 #if HAVE_UNISTD_H
24 #include <unistd.h>
25 #endif
26
27 #include "ext2_fs.h"
28 #include "ext2fs.h"
29
30 struct get_pathname_struct {
31 ext2_ino_t search_ino;
32 ext2_ino_t parent;
33 char *name;
34 errcode_t errcode;
35 };
36
37 #ifdef __TURBOC__
38 #pragma argsused
39 #endif
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)40 static int get_pathname_proc(struct ext2_dir_entry *dirent,
41 int offset EXT2FS_ATTR((unused)),
42 int blocksize EXT2FS_ATTR((unused)),
43 char *buf EXT2FS_ATTR((unused)),
44 void *priv_data)
45 {
46 struct get_pathname_struct *gp;
47 errcode_t retval;
48
49 gp = (struct get_pathname_struct *) priv_data;
50
51 if (((dirent->name_len & 0xFF) == 2) &&
52 !strncmp(dirent->name, "..", 2))
53 gp->parent = dirent->inode;
54 if (dirent->inode == gp->search_ino) {
55 retval = ext2fs_get_mem((dirent->name_len & 0xFF) + 1,
56 &gp->name);
57 if (retval) {
58 gp->errcode = retval;
59 return DIRENT_ABORT;
60 }
61 strncpy(gp->name, dirent->name, (dirent->name_len & 0xFF));
62 gp->name[dirent->name_len & 0xFF] = '\0';
63 return DIRENT_ABORT;
64 }
65 return 0;
66 }
67
ext2fs_get_pathname_int(ext2_filsys fs,ext2_ino_t dir,ext2_ino_t ino,int maxdepth,char * buf,char ** name)68 static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ext2_ino_t dir,
69 ext2_ino_t ino, int maxdepth,
70 char *buf, char **name)
71 {
72 struct get_pathname_struct gp;
73 char *parent_name, *ret;
74 errcode_t retval;
75
76 if (dir == ino) {
77 retval = ext2fs_get_mem(2, name);
78 if (retval)
79 return retval;
80 strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : ".");
81 return 0;
82 }
83
84 if (!dir || (maxdepth < 0)) {
85 retval = ext2fs_get_mem(4, name);
86 if (retval)
87 return retval;
88 strcpy(*name, "...");
89 return 0;
90 }
91
92 gp.search_ino = ino;
93 gp.parent = 0;
94 gp.name = 0;
95 gp.errcode = 0;
96
97 retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp);
98 if (retval)
99 goto cleanup;
100 if (gp.errcode) {
101 retval = gp.errcode;
102 goto cleanup;
103 }
104
105 retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1,
106 buf, &parent_name);
107 if (retval)
108 goto cleanup;
109 if (!ino) {
110 *name = parent_name;
111 return 0;
112 }
113
114 if (gp.name)
115 retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2,
116 &ret);
117 else
118 retval = ext2fs_get_mem(strlen(parent_name)+5, &ret);
119 if (retval)
120 goto cleanup;
121
122 ret[0] = 0;
123 if (parent_name[1])
124 strcat(ret, parent_name);
125 strcat(ret, "/");
126 if (gp.name)
127 strcat(ret, gp.name);
128 else
129 strcat(ret, "???");
130 *name = ret;
131 ext2fs_free_mem(&parent_name);
132 retval = 0;
133
134 cleanup:
135 if (gp.name)
136 ext2fs_free_mem(&gp.name);
137 return retval;
138 }
139
ext2fs_get_pathname(ext2_filsys fs,ext2_ino_t dir,ext2_ino_t ino,char ** name)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 }
158