import ext2fs lib to prep for new e2fsprogs

1 files changed, 99 insertions, 0 deletions

diff --git a/e2fsprogs/ext2fs/unlink.c b/e2fsprogs/ext2fs/unlink.c
new file mode 100644
index 000000000..e7b2182d2
--- /dev/null
+++ b/e2fsprogs/ext2fs/unlink.c
@@ -0,0 +1,99 @@
+/*
+ * unlink.c --- delete links in a ext2fs directory
+ * 
+ * Copyright (C) 1993, 1994, 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
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+struct link_struct  {
+	const char	*name;
+	int		namelen;
+	ext2_ino_t	inode;
+	int		flags;
+	struct ext2_dir_entry *prev;
+	int		done;
+};	
+
+#ifdef __TURBOC__
+ #pragma argsused
+#endif
+static int unlink_proc(struct ext2_dir_entry *dirent,
+		     int	offset EXT2FS_ATTR((unused)),
+		     int	blocksize EXT2FS_ATTR((unused)),
+		     char	*buf EXT2FS_ATTR((unused)),
+		     void	*priv_data)
+{
+	struct link_struct *ls = (struct link_struct *) priv_data;
+	struct ext2_dir_entry *prev;
+
+	prev = ls->prev;
+	ls->prev = dirent;
+
+	if (ls->name) {
+		if ((dirent->name_len & 0xFF) != ls->namelen)
+			return 0;
+		if (strncmp(ls->name, dirent->name, dirent->name_len & 0xFF))
+			return 0;
+	}
+	if (ls->inode) {
+		if (dirent->inode != ls->inode)
+			return 0;
+	} else {
+		if (!dirent->inode)
+			return 0;
+	}
+
+	if (prev) 
+		prev->rec_len += dirent->rec_len;
+	else
+		dirent->inode = 0;
+	ls->done++;
+	return DIRENT_ABORT|DIRENT_CHANGED;
+}
+
+#ifdef __TURBOC__
+ #pragma argsused
+#endif
+errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir,
+			const char *name, ext2_ino_t ino,
+			int flags EXT2FS_ATTR((unused)))
+{
+	errcode_t	retval;
+	struct link_struct ls;
+
+	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+	if (!name && !ino)
+		return EXT2_ET_INVALID_ARGUMENT;
+
+	if (!(fs->flags & EXT2_FLAG_RW))
+		return EXT2_ET_RO_FILSYS;
+
+	ls.name = name;
+	ls.namelen = name ? strlen(name) : 0;
+	ls.inode = ino;
+	ls.flags = 0;
+	ls.done = 0;
+	ls.prev = 0;
+
+	retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY, 
+				    0, unlink_proc, &ls);
+	if (retval)
+		return retval;
+
+	return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE;
+}
+