| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * unlink.c --- delete links in a ext2fs directory
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| 4 | *
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| 5 | * Copyright (C) 1993, 1994, 1997 Theodore Ts'o.
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| 6 | *
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| 7 | * %Begin-Header%
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| 8 | * This file may be redistributed under the terms of the GNU Public
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| 9 | * License.
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| 10 | * %End-Header%
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| 11 | */
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| 12 |
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| 13 | #include <stdio.h>
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| 14 | #include <string.h>
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| 15 | #if HAVE_UNISTD_H
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| 16 | #include <unistd.h>
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| 17 | #endif
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| 18 |
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| 19 | #include "ext2_fs.h"
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| 20 | #include "ext2fs.h"
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| 21 |
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| 22 | struct link_struct {
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| 23 | const char *name;
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| 24 | int namelen;
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| 25 | ext2_ino_t inode;
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| 26 | int flags;
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| 27 | struct ext2_dir_entry *prev;
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| 28 | int done;
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| 29 | };
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| 30 |
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| 31 | #ifdef __TURBOC__
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| 32 | # pragma argsused
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| 33 | #endif
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| 34 | static int unlink_proc(struct ext2_dir_entry *dirent,
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| 35 | int offset EXT2FS_ATTR((unused)),
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| 36 | int blocksize EXT2FS_ATTR((unused)),
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| 37 | char *buf EXT2FS_ATTR((unused)),
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| 38 | void *priv_data)
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| 39 | {
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| 40 | struct link_struct *ls = (struct link_struct *) priv_data;
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| 41 | struct ext2_dir_entry *prev;
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| 42 |
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| 43 | prev = ls->prev;
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| 44 | ls->prev = dirent;
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| 45 |
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| 46 | if (ls->name) {
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| 47 | if ((dirent->name_len & 0xFF) != ls->namelen)
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| 48 | return 0;
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| 49 | if (strncmp(ls->name, dirent->name, dirent->name_len & 0xFF))
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| 50 | return 0;
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| 51 | }
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| 52 | if (ls->inode) {
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| 53 | if (dirent->inode != ls->inode)
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| 54 | return 0;
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| 55 | } else {
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| 56 | if (!dirent->inode)
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| 57 | return 0;
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| 58 | }
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| 59 |
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| 60 | if (prev)
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| 61 | prev->rec_len += dirent->rec_len;
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| 62 | else
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| 63 | dirent->inode = 0;
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| 64 | ls->done++;
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| 65 | return DIRENT_ABORT|DIRENT_CHANGED;
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| 66 | }
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| 67 |
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| 68 | #ifdef __TURBOC__
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| 69 | #pragma argsused
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| 70 | #endif
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| 71 | errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir,
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| 72 | const char *name, ext2_ino_t ino,
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| 73 | int flags EXT2FS_ATTR((unused)))
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| 74 | {
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| 75 | errcode_t retval;
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| 76 | struct link_struct ls;
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| 77 |
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| 78 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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| 79 |
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| 80 | if (!name && !ino)
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| 81 | return EXT2_ET_INVALID_ARGUMENT;
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| 82 |
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| 83 | if (!(fs->flags & EXT2_FLAG_RW))
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| 84 | return EXT2_ET_RO_FILSYS;
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| 85 |
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| 86 | ls.name = name;
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| 87 | ls.namelen = name ? strlen(name) : 0;
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| 88 | ls.inode = ino;
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| 89 | ls.flags = 0;
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| 90 | ls.done = 0;
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| 91 | ls.prev = 0;
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| 92 |
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| 93 | retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY,
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| 94 | 0, unlink_proc, &ls);
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| 95 | if (retval)
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| 96 | return retval;
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| 97 |
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| 98 | return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE;
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| 99 | }
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| 100 |
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