Add two new functions which allows the caller to examine the last
directory block entry added to the list, and to drop if it necessary.
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
lib/ext2fs/dblist.c | 26 ++++++++++++++++++++++++++
lib/ext2fs/ext2_err.et.in | 3 +++
lib/ext2fs/ext2fs.h | 3 +++
3 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/lib/ext2fs/dblist.c b/lib/ext2fs/dblist.c
index 21b36aa..3bf63a0 100644
--- a/lib/ext2fs/dblist.c
+++ b/lib/ext2fs/dblist.c
@@ -259,3 +259,29 @@ int ext2fs_dblist_count(ext2_dblist dblist)
{
return (int) dblist->count;
}
+
+errcode_t ext2fs_dblist_get_last(ext2_dblist dblist,
+ struct ext2_db_entry **entry)
+{
+ errcode_t retval;
+
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+
+ if (dblist->count == 0)
+ return EXT2_ET_DBLIST_EMPTY;
+
+ if (entry)
+ *entry = dblist->list + ( (int) dblist->count-1);
+ return 0;
+}
+
+errcode_t ext2fs_dblist_drop_last(ext2_dblist dblist)
+{
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+
+ if (dblist->count == 0)
+ return EXT2_ET_DBLIST_EMPTY;
+
+ dblist->count--;
+ return 0;
+}
diff --git a/lib/ext2fs/ext2_err.et.in b/lib/ext2fs/ext2_err.et.in
index eda4bb4..7451242 100644
--- a/lib/ext2fs/ext2_err.et.in
+++ b/lib/ext2fs/ext2_err.et.in
@@ -326,5 +326,8 @@ ec EXT2_ET_TDB_ERR_NOEXIST,
ec EXT2_ET_TDB_ERR_RDONLY,
"TDB: Write not permitted"
+ec EXT2_ET_DBLIST_EMPTY,
+ "Ext2fs directory block list is empty"
+
end
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 0b2c321..d098961 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -652,6 +652,9 @@ extern errcode_t ext2fs_set_dir_block(ext2_dblist dblist, ext2_ino_t ino,
extern errcode_t ext2fs_copy_dblist(ext2_dblist src,
ext2_dblist *dest);
extern int ext2fs_dblist_count(ext2_dblist dblist);
+extern errcode_t ext2fs_dblist_get_last(ext2_dblist dblist,
+ struct ext2_db_entry **entry);
+extern errcode_t ext2fs_dblist_drop_last(ext2_dblist dblist);
/* dblist_dir.c */
extern errcode_t
--
1.5.4.1.144.gdfee-dirty
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