[PATCH 05/21] Make parse_tag_buffer_internal() handle item == NULL

[Johan Herland <johan@herland.net>]

This is in preparation for unifying verify_tag() and
parse_tag_buffer_internal().

Signed-off-by: Johan Herland <johan@herland.net>
---
 tag.c |   54 +++++++++++++++++++++++++++++-------------------------
 1 files changed, 29 insertions(+), 25 deletions(-)

diff --git a/tag.c b/tag.c
index 19c66cd..b134967 100644
--- a/tag.c
+++ b/tag.c
@@ -46,9 +46,11 @@ static int parse_tag_buffer_internal(struct tag *item, const char *data, const u
 	const char *type_line, *tag_line, *tagger_line;
 	unsigned long type_len, tag_len;
 
-	if (item->object.parsed)
-		return 0;
-	item->object.parsed = 1;
+	if (item) {
+		if (item->object.parsed)
+			return 0;
+		item->object.parsed = 1;
+	}
 
 	if (size < 64)
 		return error("failed preliminary size check");
@@ -85,28 +87,30 @@ static int parse_tag_buffer_internal(struct tag *item, const char *data, const u
 	memcpy(type, type_line + 5, type_len);
 	type[type_len] = '\0';
 
-	tag_len = tagger_line - tag_line - strlen("tag \n");
-	item->tag = xmalloc(tag_len + 1);
-	memcpy(item->tag, tag_line + 4, tag_len);
-	item->tag[tag_len] = '\0';
-
-	if (!strcmp(type, blob_type)) {
-		item->tagged = &lookup_blob(sha1)->object;
-	} else if (!strcmp(type, tree_type)) {
-		item->tagged = &lookup_tree(sha1)->object;
-	} else if (!strcmp(type, commit_type)) {
-		item->tagged = &lookup_commit(sha1)->object;
-	} else if (!strcmp(type, tag_type)) {
-		item->tagged = &lookup_tag(sha1)->object;
-	} else {
-		error("Unknown type %s", type);
-		item->tagged = NULL;
-	}
-
-	if (item->tagged && track_object_refs) {
-		struct object_refs *refs = alloc_object_refs(1);
-		refs->ref[0] = item->tagged;
-		set_object_refs(&item->object, refs);
+	if (item) {
+		tag_len = tagger_line - tag_line - strlen("tag \n");
+		item->tag = xmalloc(tag_len + 1);
+		memcpy(item->tag, tag_line + 4, tag_len);
+		item->tag[tag_len] = '\0';
+
+		if (!strcmp(type, blob_type)) {
+			item->tagged = &lookup_blob(sha1)->object;
+		} else if (!strcmp(type, tree_type)) {
+			item->tagged = &lookup_tree(sha1)->object;
+		} else if (!strcmp(type, commit_type)) {
+			item->tagged = &lookup_commit(sha1)->object;
+		} else if (!strcmp(type, tag_type)) {
+			item->tagged = &lookup_tag(sha1)->object;
+		} else {
+			error("Unknown type %s", type);
+			item->tagged = NULL;
+		}
+
+		if (item->tagged && track_object_refs) {
+			struct object_refs *refs = alloc_object_refs(1);
+			refs->ref[0] = item->tagged;
+			set_object_refs(&item->object, refs);
+		}
 	}
 
 	return 0;
-- 
1.5.2