mirror of https://github.com/vitalif/e2fsprogs
135 lines
2.8 KiB
C
135 lines
2.8 KiB
C
/*
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* dir_iterate.c --- ext2fs directory iteration operations
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*
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* Copyright (C) 1993, 1994, 1994, 1995, 1996, 1997 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <linux/ext2_fs.h>
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#include "ext2fsP.h"
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errcode_t ext2fs_dir_iterate(ext2_filsys fs,
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ino_t dir,
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int flags,
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char *block_buf,
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int (*func)(struct ext2_dir_entry *dirent,
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int offset,
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int blocksize,
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char *buf,
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void *private),
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void *private)
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{
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struct dir_context ctx;
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errcode_t retval;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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retval = ext2fs_check_directory(fs, dir);
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if (retval)
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return retval;
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ctx.dir = dir;
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ctx.flags = flags;
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if (block_buf)
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ctx.buf = block_buf;
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else {
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ctx.buf = malloc(fs->blocksize);
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if (!ctx.buf)
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return ENOMEM;
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}
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ctx.func = func;
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ctx.func2 = 0;
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ctx.private = private;
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ctx.errcode = 0;
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retval = ext2fs_block_iterate(fs, dir, 0, 0,
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ext2fs_process_dir_block, &ctx);
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if (!block_buf)
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free(ctx.buf);
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if (retval)
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return retval;
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return ctx.errcode;
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}
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/*
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* Helper function which is private to this module. Used by
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* ext2fs_dir_iterate() and ext2fs_dblist_dir_iterate()
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*/
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extern int ext2fs_process_dir_block(ext2_filsys fs,
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blk_t *blocknr,
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int blockcnt,
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void *private)
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{
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struct dir_context *ctx = (struct dir_context *) private;
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int offset = 0;
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int ret = 0;
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int changed = 0;
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int do_abort = 0;
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int entry;
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struct ext2_dir_entry *dirent;
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if (blockcnt < 0)
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return 0;
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ctx->errcode = ext2fs_read_dir_block(fs, *blocknr, ctx->buf);
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if (ctx->errcode)
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return BLOCK_ABORT;
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entry = blockcnt ? DIRENT_OTHER_FILE : DIRENT_DOT_FILE;
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while (offset < fs->blocksize) {
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dirent = (struct ext2_dir_entry *) (ctx->buf + offset);
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if (!dirent->inode &&
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!(ctx->flags & DIRENT_FLAG_INCLUDE_EMPTY))
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goto next;
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if (ctx->func)
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ret = (ctx->func)(dirent, offset, fs->blocksize,
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ctx->buf, ctx->private);
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else if (ctx->func2) {
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ret = (ctx->func2)(ctx->dir, entry, dirent, offset,
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fs->blocksize, ctx->buf,
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ctx->private);
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if (entry < DIRENT_OTHER_FILE)
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entry++;
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}
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if (ret & DIRENT_CHANGED)
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changed++;
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if (ret & DIRENT_ABORT) {
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do_abort++;
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break;
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}
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next:
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if (((offset + dirent->rec_len) > fs->blocksize) ||
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(dirent->rec_len < 8) ||
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((dirent->name_len+8) > dirent->rec_len)) {
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ctx->errcode = EXT2_ET_DIR_CORRUPTED;
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return BLOCK_ABORT;
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}
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offset += dirent->rec_len;
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}
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if (changed) {
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ctx->errcode = ext2fs_write_dir_block(fs, *blocknr, ctx->buf);
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if (ctx->errcode)
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return BLOCK_ABORT;
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}
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if (do_abort)
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return BLOCK_ABORT;
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return 0;
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}
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