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/*
* dir_iterate.c --- ext2fs directory iteration operations
*
* Copyright (C) 1993, 1994, 1994, 1995, 1996, 1997 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if EXT2_FLAT_INCLUDES
#include "ext2_fs.h"
#else
#include <linux/ext2_fs.h>
#endif
#include "ext2fsP.h"
errcode_t ext2fs_dir_iterate(ext2_filsys fs,
ext2_ino_t dir,
int flags,
char *block_buf,
int (*func)(struct ext2_dir_entry *dirent,
int offset,
int blocksize,
char *buf,
void *priv_data),
void *priv_data)
{
struct dir_context ctx;
errcode_t retval;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
retval = ext2fs_check_directory(fs, dir);
if (retval)
return retval;
ctx.dir = dir;
ctx.flags = flags;
if (block_buf)
ctx.buf = block_buf;
else {
retval = ext2fs_get_mem(fs->blocksize, (void **) &ctx.buf);
if (retval)
return retval;
}
ctx.func = func;
ctx.func2 = 0;
ctx.priv_data = priv_data;
ctx.errcode = 0;
retval = ext2fs_block_iterate2(fs, dir, 0, 0,
ext2fs_process_dir_block, &ctx);
if (!block_buf)
ext2fs_free_mem((void **) &ctx.buf);
if (retval)
return retval;
return ctx.errcode;
}
/*
* Helper function which is private to this module. Used by
* ext2fs_dir_iterate() and ext2fs_dblist_dir_iterate()
*/
int ext2fs_process_dir_block(ext2_filsys fs,
blk_t *blocknr,
e2_blkcnt_t blockcnt,
blk_t ref_block,
int ref_offset,
void *priv_data)
{
struct dir_context *ctx = (struct dir_context *) priv_data;
int offset = 0;
int ret = 0;
int changed = 0;
int do_abort = 0;
int entry;
struct ext2_dir_entry *dirent;
if (blockcnt < 0)
return 0;
entry = blockcnt ? DIRENT_OTHER_FILE : DIRENT_DOT_FILE;
ctx->errcode = ext2fs_read_dir_block(fs, *blocknr, ctx->buf);
if (ctx->errcode)
return BLOCK_ABORT;
while (offset < fs->blocksize) {
dirent = (struct ext2_dir_entry *) (ctx->buf + offset);
if (((offset + dirent->rec_len) > fs->blocksize) ||
(dirent->rec_len < 8) ||
(((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
ctx->errcode = EXT2_ET_DIR_CORRUPTED;
return BLOCK_ABORT;
}
if (!dirent->inode &&
!(ctx->flags & DIRENT_FLAG_INCLUDE_EMPTY))
goto next;
if (ctx->func)
ret = (ctx->func)(dirent, offset, fs->blocksize,
ctx->buf, ctx->priv_data);
else if (ctx->func2) {
ret = (ctx->func2)(ctx->dir, entry, dirent, offset,
fs->blocksize, ctx->buf,
ctx->priv_data);
if (entry < DIRENT_OTHER_FILE)
entry++;
}
if (ret & DIRENT_CHANGED)
changed++;
if (ret & DIRENT_ABORT) {
do_abort++;
break;
}
next:
offset += dirent->rec_len;
}
if (changed) {
ctx->errcode = ext2fs_write_dir_block(fs, *blocknr, ctx->buf);
if (ctx->errcode)
return BLOCK_ABORT;
}
if (do_abort)
return BLOCK_ABORT;
return 0;
}
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