From 3b34934dcaa4e643a3691ba1f10db054adf60ffb Mon Sep 17 00:00:00 2001
From: Patryk Obara <patryk.obara@gmail.com>
Date: Sun, 28 Jan 2018 01:13:15 +0100
Subject: match-trees: convert splice_tree to object_id

Convert the definition of static recursive splice_tree function to use
struct object_id and adjust single caller.

Signed-off-by: Patryk Obara <patryk.obara@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/match-trees.c b/match-trees.c
index 396b733..afb771c 100644
--- a/match-trees.c
+++ b/match-trees.c
@@ -158,22 +158,20 @@ static void match_trees(const struct object_id *hash1,
 }
 
 /*
- * A tree "hash1" has a subdirectory at "prefix".  Come up with a
- * tree object by replacing it with another tree "hash2".
+ * A tree "oid1" has a subdirectory at "prefix".  Come up with a tree object by
+ * replacing it with another tree "oid2".
  */
-static int splice_tree(const unsigned char *hash1,
-		       const char *prefix,
-		       const unsigned char *hash2,
-		       unsigned char *result)
+static int splice_tree(const struct object_id *oid1, const char *prefix,
+		       const struct object_id *oid2, struct object_id *result)
 {
 	char *subpath;
 	int toplen;
 	char *buf;
 	unsigned long sz;
 	struct tree_desc desc;
-	unsigned char *rewrite_here;
-	const unsigned char *rewrite_with;
-	unsigned char subtree[20];
+	struct object_id *rewrite_here;
+	const struct object_id *rewrite_with;
+	struct object_id subtree;
 	enum object_type type;
 	int status;
 
@@ -182,9 +180,9 @@ static int splice_tree(const unsigned char *hash1,
 	if (*subpath)
 		subpath++;
 
-	buf = read_sha1_file(hash1, &type, &sz);
+	buf = read_sha1_file(oid1->hash, &type, &sz);
 	if (!buf)
-		die("cannot read tree %s", sha1_to_hex(hash1));
+		die("cannot read tree %s", oid_to_hex(oid1));
 	init_tree_desc(&desc, buf, sz);
 
 	rewrite_here = NULL;
@@ -197,26 +195,26 @@ static int splice_tree(const unsigned char *hash1,
 		if (strlen(name) == toplen &&
 		    !memcmp(name, prefix, toplen)) {
 			if (!S_ISDIR(mode))
-				die("entry %s in tree %s is not a tree",
-				    name, sha1_to_hex(hash1));
-			rewrite_here = (unsigned char *) oid->hash;
+				die("entry %s in tree %s is not a tree", name,
+				    oid_to_hex(oid1));
+			rewrite_here = (struct object_id *)oid;
 			break;
 		}
 		update_tree_entry(&desc);
 	}
 	if (!rewrite_here)
-		die("entry %.*s not found in tree %s",
-		    toplen, prefix, sha1_to_hex(hash1));
+		die("entry %.*s not found in tree %s", toplen, prefix,
+		    oid_to_hex(oid1));
 	if (*subpath) {
-		status = splice_tree(rewrite_here, subpath, hash2, subtree);
+		status = splice_tree(rewrite_here, subpath, oid2, &subtree);
 		if (status)
 			return status;
-		rewrite_with = subtree;
+		rewrite_with = &subtree;
+	} else {
+		rewrite_with = oid2;
 	}
-	else
-		rewrite_with = hash2;
-	hashcpy(rewrite_here, rewrite_with);
-	status = write_sha1_file(buf, sz, tree_type, result);
+	oidcpy(rewrite_here, rewrite_with);
+	status = write_sha1_file(buf, sz, tree_type, result->hash);
 	free(buf);
 	return status;
 }
@@ -280,7 +278,7 @@ void shift_tree(const struct object_id *hash1,
 	if (!*add_prefix)
 		return;
 
-	splice_tree(hash1->hash, add_prefix, hash2->hash, shifted->hash);
+	splice_tree(hash1, add_prefix, hash2, shifted);
 }
 
 /*
@@ -334,7 +332,7 @@ void shift_tree_by(const struct object_id *hash1,
 		 * shift tree2 down by adding shift_prefix above it
 		 * to match tree1.
 		 */
-		splice_tree(hash1->hash, shift_prefix, hash2->hash, shifted->hash);
+		splice_tree(hash1, shift_prefix, hash2, shifted);
 	else
 		/*
 		 * shift tree2 up by removing shift_prefix from it
-- 
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