| Denis Vlasenko | c4f623e | 2006-12-26 01:30:59 +0000 | [diff] [blame] | 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 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 | } |