blob: 71a9ffcb9b7f10ea1a0f13109b3a00f747a5b456
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * unlink.c --- delete links in a ext2fs directory |
4 | * |
5 | * Copyright (C) 1993, 1994, 1997 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 | |
13 | #include <stdio.h> |
14 | #include <string.h> |
15 | #if HAVE_UNISTD_H |
16 | #include <unistd.h> |
17 | #endif |
18 | |
19 | #include "ext2_fs.h" |
20 | #include "ext2fs.h" |
21 | |
22 | struct link_struct { |
23 | const char *name; |
24 | int namelen; |
25 | ext2_ino_t inode; |
26 | int flags; |
27 | struct ext2_dir_entry *prev; |
28 | int done; |
29 | }; |
30 | |
31 | #ifdef __TURBOC__ |
32 | # pragma argsused |
33 | #endif |
34 | static int unlink_proc(struct ext2_dir_entry *dirent, |
35 | int offset EXT2FS_ATTR((unused)), |
36 | int blocksize EXT2FS_ATTR((unused)), |
37 | char *buf EXT2FS_ATTR((unused)), |
38 | void *priv_data) |
39 | { |
40 | struct link_struct *ls = (struct link_struct *) priv_data; |
41 | struct ext2_dir_entry *prev; |
42 | |
43 | prev = ls->prev; |
44 | ls->prev = dirent; |
45 | |
46 | if (ls->name) { |
47 | if ((dirent->name_len & 0xFF) != ls->namelen) |
48 | return 0; |
49 | if (strncmp(ls->name, dirent->name, dirent->name_len & 0xFF)) |
50 | return 0; |
51 | } |
52 | if (ls->inode) { |
53 | if (dirent->inode != ls->inode) |
54 | return 0; |
55 | } else { |
56 | if (!dirent->inode) |
57 | return 0; |
58 | } |
59 | |
60 | if (prev) |
61 | prev->rec_len += dirent->rec_len; |
62 | else |
63 | dirent->inode = 0; |
64 | ls->done++; |
65 | return DIRENT_ABORT|DIRENT_CHANGED; |
66 | } |
67 | |
68 | #ifdef __TURBOC__ |
69 | #pragma argsused |
70 | #endif |
71 | errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir, |
72 | const char *name, ext2_ino_t ino, |
73 | int flags EXT2FS_ATTR((unused))) |
74 | { |
75 | errcode_t retval; |
76 | struct link_struct ls; |
77 | |
78 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
79 | |
80 | if (!name && !ino) |
81 | return EXT2_ET_INVALID_ARGUMENT; |
82 | |
83 | if (!(fs->flags & EXT2_FLAG_RW)) |
84 | return EXT2_ET_RO_FILSYS; |
85 | |
86 | ls.name = name; |
87 | ls.namelen = name ? strlen(name) : 0; |
88 | ls.inode = ino; |
89 | ls.flags = 0; |
90 | ls.done = 0; |
91 | ls.prev = 0; |
92 | |
93 | retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY, |
94 | 0, unlink_proc, &ls); |
95 | if (retval) |
96 | return retval; |
97 | |
98 | return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE; |
99 | } |
100 |