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