Merge branch 'gl/cleanup'

* gl/cleanup:
  Convert memset(hash,0,20) to hashclr(hash).
  Convert memcpy(a,b,20) to hashcpy(a,b).

35 files changed, 90 insertions, 83 deletions

diff --git a/blame.c b/blame.c
index c253b9ca45..8968046b00 100644
--- a/blame.c
+++ b/blame.c
@@ -165,7 +165,7 @@ static int get_blob_sha1(struct tree *t, const char *pathname,
 	blame_file = pathname;
 	pathspec[0] = pathname;
 	pathspec[1] = NULL;
-	memset(blob_sha1, 0, sizeof(blob_sha1));
+	hashclr(blob_sha1);
 	read_tree_recursive(t, "", 0, 0, pathspec, get_blob_sha1_internal);
 
 	for (i = 0; i < 20; i++) {
@@ -176,7 +176,7 @@ static int get_blob_sha1(struct tree *t, const char *pathname,
 	if (i == 20)
 		return -1;
 
-	memcpy(sha1, blob_sha1, 20);
+	hashcpy(sha1, blob_sha1);
 	return 0;
 }
 
@@ -191,7 +191,7 @@ static int get_blob_sha1_internal(const unsigned char *sha1, const char *base,
 	    strcmp(blame_file + baselen, pathname))
 		return -1;
 
-	memcpy(blob_sha1, sha1, 20);
+	hashcpy(blob_sha1, sha1);
 	return -1;
 }
 
diff --git a/builtin-diff.c b/builtin-diff.c
index 874f773421..a6590205e8 100644
--- a/builtin-diff.c
+++ b/builtin-diff.c
@@ -192,7 +192,7 @@ static int builtin_diff_combined(struct rev_info *revs,
 	parent = xmalloc(ents * sizeof(*parent));
 	/* Again, the revs are all reverse */
 	for (i = 0; i < ents; i++)
-		memcpy(parent + i, ent[ents - 1 - i].item->sha1, 20);
+		hashcpy((unsigned char*)parent + i, ent[ents - 1 - i].item->sha1);
 	diff_tree_combined(parent[0], parent + 1, ents - 1,
 			   revs->dense_combined_merges, revs);
 	return 0;
@@ -290,7 +290,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 		if (obj->type == OBJ_BLOB) {
 			if (2 <= blobs)
 				die("more than two blobs given: '%s'", name);
-			memcpy(blob[blobs].sha1, obj->sha1, 20);
+			hashcpy(blob[blobs].sha1, obj->sha1);
 			blob[blobs].name = name;
 			blobs++;
 			continue;
diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index f19f0d6046..46f524dfc3 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -534,7 +534,7 @@ static int add_object_entry(const unsigned char *sha1, unsigned hash, int exclud
 	entry = objects + idx;
 	nr_objects = idx + 1;
 	memset(entry, 0, sizeof(*entry));
-	memcpy(entry->sha1, sha1, 20);
+	hashcpy(entry->sha1, sha1);
 	entry->hash = hash;
 
 	if (object_ix_hashsz * 3 <= nr_objects * 4)
@@ -649,7 +649,7 @@ static struct pbase_tree_cache *pbase_tree_get(const unsigned char *sha1)
 		free(ent->tree_data);
 		nent = ent;
 	}
-	memcpy(nent->sha1, sha1, 20);
+	hashcpy(nent->sha1, sha1);
 	nent->tree_data = data;
 	nent->tree_size = size;
 	nent->ref = 1;
@@ -799,7 +799,7 @@ static void add_preferred_base(unsigned char *sha1)
 	it->next = pbase_tree;
 	pbase_tree = it;
 
-	memcpy(it->pcache.sha1, tree_sha1, 20);
+	hashcpy(it->pcache.sha1, tree_sha1);
 	it->pcache.tree_data = data;
 	it->pcache.tree_size = size;
 }
diff --git a/builtin-read-tree.c b/builtin-read-tree.c
index 53087faf7a..c1867d2a00 100644
--- a/builtin-read-tree.c
+++ b/builtin-read-tree.c
@@ -53,7 +53,7 @@ static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
 	struct name_entry entry;
 	int cnt;
 
-	memcpy(it->sha1, tree->object.sha1, 20);
+	hashcpy(it->sha1, tree->object.sha1);
 	desc.buf = tree->buffer;
 	desc.size = tree->size;
 	cnt = 0;
diff --git a/builtin-unpack-objects.c b/builtin-unpack-objects.c
index f0ae5c987a..ca0ebc2585 100644
--- a/builtin-unpack-objects.c
+++ b/builtin-unpack-objects.c
@@ -95,7 +95,7 @@ static void add_delta_to_list(unsigned char *base_sha1, void *delta, unsigned lo
 {
 	struct delta_info *info = xmalloc(sizeof(*info));
 
-	memcpy(info->base_sha1, base_sha1, 20);
+	hashcpy(info->base_sha1, base_sha1);
 	info->size = size;
 	info->delta = delta;
 	info->next = delta_list;
@@ -173,7 +173,7 @@ static int unpack_delta_entry(unsigned long delta_size)
 	unsigned char base_sha1[20];
 	int result;
 
-	memcpy(base_sha1, fill(20), 20);
+	hashcpy(base_sha1, fill(20));
 	use(20);
 
 	delta_data = get_data(delta_size);
diff --git a/builtin-update-index.c b/builtin-update-index.c
index 75c0abb96c..0620e779b0 100644
--- a/builtin-update-index.c
+++ b/builtin-update-index.c
@@ -142,7 +142,7 @@ static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 	size = cache_entry_size(len);
 	ce = xcalloc(1, size);
 
-	memcpy(ce->sha1, sha1, 20);
+	hashcpy(ce->sha1, sha1);
 	memcpy(ce->name, path, len);
 	ce->ce_flags = create_ce_flags(len, stage);
 	ce->ce_mode = create_ce_mode(mode);
@@ -333,7 +333,7 @@ static struct cache_entry *read_one_ent(const char *which,
 	size = cache_entry_size(namelen);
 	ce = xcalloc(1, size);
 
-	memcpy(ce->sha1, sha1, 20);
+	hashcpy(ce->sha1, sha1);
 	memcpy(ce->name, path, namelen);
 	ce->ce_flags = create_ce_flags(namelen, stage);
 	ce->ce_mode = create_ce_mode(mode);
diff --git a/builtin-update-ref.c b/builtin-update-ref.c
index 5bd71825fd..90a3da53ad 100644
--- a/builtin-update-ref.c
+++ b/builtin-update-ref.c
@@ -44,7 +44,7 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
 
 	if (get_sha1(value, sha1))
 		die("%s: not a valid SHA1", value);
-	memset(oldsha1, 0, 20);
+	hashclr(oldsha1);
 	if (oldval && get_sha1(oldval, oldsha1))
 		die("%s: not a valid old SHA1", oldval);
 
diff --git a/builtin-write-tree.c b/builtin-write-tree.c
index ca06149f18..50670dc7bf 100644
--- a/builtin-write-tree.c
+++ b/builtin-write-tree.c
@@ -50,10 +50,10 @@ int write_tree(unsigned char *sha1, int missing_ok, const char *prefix)
 	if (prefix) {
 		struct cache_tree *subtree =
 			cache_tree_find(active_cache_tree, prefix);
-		memcpy(sha1, subtree->sha1, 20);
+		hashcpy(sha1, subtree->sha1);
 	}
 	else
-		memcpy(sha1, active_cache_tree->sha1, 20);
+		hashcpy(sha1, active_cache_tree->sha1);
 
 	rollback_lock_file(lock_file);
 
diff --git a/cache-tree.c b/cache-tree.c
index d9f7e1e3dd..323c68a670 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -335,7 +335,7 @@ static int update_one(struct cache_tree *it,
 		offset += sprintf(buffer + offset,
 				  "%o %.*s", mode, entlen, path + baselen);
 		buffer[offset++] = 0;
-		memcpy(buffer + offset, sha1, 20);
+		hashcpy((unsigned char*)buffer + offset, sha1);
 		offset += 20;
 
 #if DEBUG
@@ -412,7 +412,7 @@ static void *write_one(struct cache_tree *it,
 #endif
 
 	if (0 <= it->entry_count) {
-		memcpy(buffer + *offset, it->sha1, 20);
+		hashcpy((unsigned char*)buffer + *offset, it->sha1);
 		*offset += 20;
 	}
 	for (i = 0; i < it->subtree_nr; i++) {
@@ -478,7 +478,7 @@ static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
 	if (0 <= it->entry_count) {
 		if (size < 20)
 			goto free_return;
-		memcpy(it->sha1, buf, 20);
+		hashcpy(it->sha1, (unsigned char*)buf);
 		buf += 20;
 		size -= 20;
 	}
diff --git a/cache.h b/cache.h
index 3044794468..1f212d77a4 100644
--- a/cache.h
+++ b/cache.h
@@ -218,6 +218,14 @@ static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 {
 	return memcmp(sha1, sha2, 20);
 }
+static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
+{
+	memcpy(sha_dst, sha_src, 20);
+}
+static inline void hashclr(unsigned char *hash)
+{
+	memset(hash, 0, 20);
+}
 
 int git_mkstemp(char *path, size_t n, const char *template);
 
diff --git a/combine-diff.c b/combine-diff.c
index 0682acd50d..46d9121baf 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -31,9 +31,9 @@ static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr,
 			memset(p->parent, 0,
 			       sizeof(p->parent[0]) * num_parent);
 
-			memcpy(p->sha1, q->queue[i]->two->sha1, 20);
+			hashcpy(p->sha1, q->queue[i]->two->sha1);
 			p->mode = q->queue[i]->two->mode;
-			memcpy(p->parent[n].sha1, q->queue[i]->one->sha1, 20);
+			hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
 			p->parent[n].mode = q->queue[i]->one->mode;
 			p->parent[n].status = q->queue[i]->status;
 			*tail = p;
@@ -56,8 +56,7 @@ static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr,
 			len = strlen(path);
 			if (len == p->len && !memcmp(path, p->path, len)) {
 				found = 1;
-				memcpy(p->parent[n].sha1,
-				       q->queue[i]->one->sha1, 20);
+				hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
 				p->parent[n].mode = q->queue[i]->one->mode;
 				p->parent[n].status = q->queue[i]->status;
 				break;
@@ -927,6 +926,7 @@ void diff_tree_combined_merge(const unsigned char *sha1,
 	for (parents = commit->parents, num_parent = 0;
 	     parents;
 	     parents = parents->next, num_parent++)
-		memcpy(parent + num_parent, parents->item->object.sha1, 20);
+		hashcpy((unsigned char*)(parent + num_parent),
+			parents->item->object.sha1);
 	diff_tree_combined(sha1, parent, num_parent, dense, rev);
 }
diff --git a/connect.c b/connect.c
index 7a6a73f2a3..e501ccce25 100644
--- a/connect.c
+++ b/connect.c
@@ -77,7 +77,7 @@ struct ref **get_remote_heads(int in, struct ref **list,
 		if (nr_match && !path_match(name, nr_match, match))
 			continue;
 		ref = xcalloc(1, sizeof(*ref) + len - 40);
-		memcpy(ref->old_sha1, old_sha1, 20);
+		hashcpy(ref->old_sha1, old_sha1);
 		memcpy(ref->name, buffer + 41, len - 40);
 		*list = ref;
 		list = &ref->next;
@@ -208,7 +208,7 @@ static struct ref *try_explicit_object_name(const char *name)
 	len = strlen(name) + 1;
 	ref = xcalloc(1, sizeof(*ref) + len);
 	memcpy(ref->name, name, len);
-	memcpy(ref->new_sha1, sha1, 20);
+	hashcpy(ref->new_sha1, sha1);
 	return ref;
 }
 
@@ -318,7 +318,7 @@ int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 			int len = strlen(src->name) + 1;
 			dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
 			memcpy(dst_peer->name, src->name, len);
-			memcpy(dst_peer->new_sha1, src->new_sha1, 20);
+			hashcpy(dst_peer->new_sha1, src->new_sha1);
 			link_dst_tail(dst_peer, dst_tail);
 		}
 		dst_peer->peer_ref = src;
diff --git a/convert-objects.c b/convert-objects.c
index 4e7ff7517f..631678b08a 100644
--- a/convert-objects.c
+++ b/convert-objects.c
@@ -23,7 +23,7 @@ static struct entry * convert_entry(unsigned char *sha1);
 static struct entry *insert_new(unsigned char *sha1, int pos)
 {
 	struct entry *new = xcalloc(1, sizeof(struct entry));
-	memcpy(new->old_sha1, sha1, 20);
+	hashcpy(new->old_sha1, sha1);
 	memmove(convert + pos + 1, convert + pos, (nr_convert - pos) * sizeof(struct entry *));
 	convert[pos] = new;
 	nr_convert++;
@@ -54,7 +54,7 @@ static struct entry *lookup_entry(unsigned char *sha1)
 static void convert_binary_sha1(void *buffer)
 {
 	struct entry *entry = convert_entry(buffer);
-	memcpy(buffer, entry->new_sha1, 20);
+	hashcpy(buffer, entry->new_sha1);
 }
 
 static void convert_ascii_sha1(void *buffer)
@@ -104,7 +104,7 @@ static int write_subdirectory(void *buffer, unsigned long size, const char *base
 		if (!slash) {
 			newlen += sprintf(new + newlen, "%o %s", mode, path);
 			new[newlen++] = '\0';
-			memcpy(new + newlen, (char *) buffer + len - 20, 20);
+			hashcpy((unsigned char*)new + newlen, (unsigned char *) buffer + len - 20);
 			newlen += 20;
 
 			used += len;
diff --git a/csum-file.c b/csum-file.c
index e2278897d0..b7174c6c05 100644
--- a/csum-file.c
+++ b/csum-file.c
@@ -38,7 +38,7 @@ int sha1close(struct sha1file *f, unsigned char *result, int update)
 	}
 	SHA1_Final(f->buffer, &f->ctx);
 	if (result)
-		memcpy(result, f->buffer, 20);
+		hashcpy(result, f->buffer);
 	if (update)
 		sha1flush(f, 20);
 	if (close(f->fd))
diff --git a/diff-lib.c b/diff-lib.c
index 3e4b3b96b7..9edfa92626 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -48,7 +48,7 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
 			memcpy(dpath->path, ce->name, path_len);
 			dpath->path[path_len] = '\0';
 			dpath->mode = 0;
-			memset(dpath->sha1, 0, 20);
+			hashclr(dpath->sha1);
 			memset(&(dpath->parent[0]), 0,
 					sizeof(struct combine_diff_parent)*5);
 
@@ -66,8 +66,7 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
 				if (2 <= stage) {
 					int mode = ntohl(nce->ce_mode);
 					num_compare_stages++;
-					memcpy(dpath->parent[stage-2].sha1,
-					       nce->sha1, 20);
+					hashcpy(dpath->parent[stage-2].sha1, nce->sha1);
 					dpath->parent[stage-2].mode =
 						canon_mode(mode);
 					dpath->parent[stage-2].status =
diff --git a/diff.c b/diff.c
index da7cca1952..ca171e8e69 100644
--- a/diff.c
+++ b/diff.c
@@ -1101,7 +1101,7 @@ void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
 {
 	if (mode) {
 		spec->mode = canon_mode(mode);
-		memcpy(spec->sha1, sha1, 20);
+		hashcpy(spec->sha1, sha1);
 		spec->sha1_valid = !is_null_sha1(sha1);
 	}
 }
@@ -1194,7 +1194,7 @@ static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
 			sizeof(*sha1_size_cache));
 	e = xmalloc(sizeof(struct sha1_size_cache));
 	sha1_size_cache[first] = e;
-	memcpy(e->sha1, sha1, 20);
+	hashcpy(e->sha1, sha1);
 	e->size = size;
 	return e;
 }
@@ -1516,7 +1516,7 @@ static void diff_fill_sha1_info(struct diff_filespec *one)
 		}
 	}
 	else
-		memset(one->sha1, 0, 20);
+		hashclr(one->sha1);
 }
 
 static void run_diff(struct diff_filepair *p, struct diff_options *o)
diff --git a/fetch-pack.c b/fetch-pack.c
index e18c1489a1..377feded1c 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -404,7 +404,7 @@ static int everything_local(struct ref **refs, int nr_match, char **match)
 			continue;
 		}
 
-		memcpy(ref->new_sha1, local, 20);
+		hashcpy(ref->new_sha1, local);
 		if (!verbose)
 			continue;
 		fprintf(stderr,
diff --git a/fetch.c b/fetch.c
index aeb6bf2639..ef60b045ea 100644
--- a/fetch.c
+++ b/fetch.c
@@ -84,7 +84,7 @@ static int process_commit(struct commit *commit)
 	if (commit->object.flags & COMPLETE)
 		return 0;
 
-	memcpy(current_commit_sha1, commit->object.sha1, 20);
+	hashcpy(current_commit_sha1, commit->object.sha1);
 
 	pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
 
diff --git a/fsck-objects.c b/fsck-objects.c
index 31e00d84b3..ae0ec8d039 100644
--- a/fsck-objects.c
+++ b/fsck-objects.c
@@ -356,7 +356,7 @@ static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 	int nr;
 
 	entry->ino = ino;
-	memcpy(entry->sha1, sha1, 20);
+	hashcpy(entry->sha1, sha1);
 	nr = sha1_list.nr;
 	if (nr == MAX_SHA1_ENTRIES) {
 		fsck_sha1_list();
diff --git a/http-fetch.c b/http-fetch.c
index d1f74b443b..7619b338fe 100644
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -393,7 +393,7 @@ void prefetch(unsigned char *sha1)
 	char *filename = sha1_file_name(sha1);
 
 	newreq = xmalloc(sizeof(*newreq));
-	memcpy(newreq->sha1, sha1, 20);
+	hashcpy(newreq->sha1, sha1);
 	newreq->repo = alt;
 	newreq->url = NULL;
 	newreq->local = -1;
diff --git a/http-push.c b/http-push.c
index 7d12f6975c..04cb238e96 100644
--- a/http-push.c
+++ b/http-push.c
@@ -1874,7 +1874,7 @@ static int one_local_ref(const char *refname, const unsigned char *sha1)
 	struct ref *ref;
 	int len = strlen(refname) + 1;
 	ref = xcalloc(1, sizeof(*ref) + len);
-	memcpy(ref->new_sha1, sha1, 20);
+	hashcpy(ref->new_sha1, sha1);
 	memcpy(ref->name, refname, len);
 	*local_tail = ref;
 	local_tail = &ref->next;
@@ -1909,7 +1909,7 @@ static void one_remote_ref(char *refname)
 	}
 
 	ref = xcalloc(1, sizeof(*ref) + len);
-	memcpy(ref->old_sha1, remote_sha1, 20);
+	hashcpy(ref->old_sha1, remote_sha1);
 	memcpy(ref->name, refname, len);
 	*remote_tail = ref;
 	remote_tail = &ref->next;
@@ -2164,7 +2164,7 @@ static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
 	if (*symref != NULL)
 		free(*symref);
 	*symref = NULL;
-	memset(sha1, 0, 20);
+	hashclr(sha1);
 
 	if (buffer.posn == 0)
 		return;
@@ -2445,7 +2445,7 @@ int main(int argc, char **argv)
 				continue;
 			}
 		}
-		memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
+		hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 		if (is_zero_sha1(ref->new_sha1)) {
 			error("cannot happen anymore");
 			rc = -3;
diff --git a/index-pack.c b/index-pack.c
index 96ea687463..80bc6cb45b 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -161,7 +161,7 @@ static void *unpack_raw_entry(unsigned long offset,
 	case OBJ_DELTA:
 		if (pos + 20 >= pack_limit)
 			bad_object(offset, "object extends past end of pack");
-		memcpy(delta_base, pack_base + pos, 20);
+		hashcpy(delta_base, pack_base + pos);
 		pos += 20;
 		/* fallthru */
 	case OBJ_COMMIT:
@@ -304,7 +304,7 @@ static void parse_pack_objects(void)
 		if (obj->type == OBJ_DELTA) {
 			struct delta_entry *delta = &deltas[nr_deltas++];
 			delta->obj = obj;
-			memcpy(delta->base_sha1, base_sha1, 20);
+			hashcpy(delta->base_sha1, base_sha1);
 		} else
 			sha1_object(data, data_size, obj->type, obj->sha1);
 		free(data);
diff --git a/mktree.c b/mktree.c
index 93241385e4..56205d1e00 100644
--- a/mktree.c
+++ b/mktree.c
@@ -30,7 +30,7 @@ static void append_to_tree(unsigned mode, unsigned char *sha1, char *path)
 	ent = entries[used++] = xmalloc(sizeof(**entries) + len + 1);
 	ent->mode = mode;
 	ent->len = len;
-	memcpy(ent->sha1, sha1, 20);
+	hashcpy(ent->sha1, sha1);
 	memcpy(ent->name, path, len+1);
 }
 
@@ -64,7 +64,7 @@ static void write_tree(unsigned char *sha1)
 		offset += sprintf(buffer + offset, "%o ", ent->mode);
 		offset += sprintf(buffer + offset, "%s", ent->name);
 		buffer[offset++] = 0;
-		memcpy(buffer + offset, ent->sha1, 20);
+		hashcpy((unsigned char*)buffer + offset, ent->sha1);
 		offset += 20;
 	}
 	write_sha1_file(buffer, offset, tree_type, sha1);
diff --git a/object.c b/object.c
index fdcfff7c86..60bf16b902 100644
--- a/object.c
+++ b/object.c
@@ -91,7 +91,7 @@ void created_object(const unsigned char *sha1, struct object *obj)
 	obj->used = 0;
 	obj->type = OBJ_NONE;
 	obj->flags = 0;
-	memcpy(obj->sha1, sha1, 20);
+	hashcpy(obj->sha1, sha1);
 
 	if (obj_hash_size - 1 <= nr_objs * 2)
 		grow_object_hash();
diff --git a/patch-id.c b/patch-id.c
index 3b4c80f764..086d2d9c68 100644
--- a/patch-id.c
+++ b/patch-id.c
@@ -47,7 +47,7 @@ static void generate_id_list(void)
 
 		if (!get_sha1_hex(p, n)) {
 			flush_current_id(patchlen, sha1, &ctx);
-			memcpy(sha1, n, 20);
+			hashcpy(sha1, n);
 			patchlen = 0;
 			continue;
 		}
diff --git a/receive-pack.c b/receive-pack.c
index 81e91909b8..201531626c 100644
--- a/receive-pack.c
+++ b/receive-pack.c
@@ -247,8 +247,8 @@ static void read_head_info(void)
 				report_status = 1;
 		}
 		cmd = xmalloc(sizeof(struct command) + len - 80);
-		memcpy(cmd->old_sha1, old_sha1, 20);
-		memcpy(cmd->new_sha1, new_sha1, 20);
+		hashcpy(cmd->old_sha1, old_sha1);
+		hashcpy(cmd->new_sha1, new_sha1);
 		memcpy(cmd->ref_name, line + 82, len - 81);
 		cmd->error_string = "n/a (unpacker error)";
 		cmd->next = NULL;
diff --git a/refs.c b/refs.c
index 17cd0cef3c..e70ef0ae0f 100644
--- a/refs.c
+++ b/refs.c
@@ -29,7 +29,7 @@ const char *resolve_ref(const char *path, unsigned char *sha1, int reading)
 		if (lstat(path, &st) < 0) {
 			if (reading || errno != ENOENT)
 				return NULL;
-			memset(sha1, 0, 20);
+			hashclr(sha1);
 			return path;
 		}
 
diff --git a/revision.c b/revision.c
index 5a91d06b98..1d89d72738 100644
--- a/revision.c
+++ b/revision.c
@@ -496,7 +496,7 @@ static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
 		it = get_reference(revs, arg, sha1, 0);
 		if (it->type != OBJ_TAG)
 			break;
-		memcpy(sha1, ((struct tag*)it)->tagged->sha1, 20);
+		hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
 	}
 	if (it->type != OBJ_COMMIT)
 		return 0;
diff --git a/send-pack.c b/send-pack.c
index f7c0cfc6f6..fd79a61923 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -185,7 +185,7 @@ static int one_local_ref(const char *refname, const unsigned char *sha1)
 	struct ref *ref;
 	int len = strlen(refname) + 1;
 	ref = xcalloc(1, sizeof(*ref) + len);
-	memcpy(ref->new_sha1, sha1, 20);
+	hashcpy(ref->new_sha1, sha1);
 	memcpy(ref->name, refname, len);
 	*local_tail = ref;
 	local_tail = &ref->next;
@@ -310,7 +310,7 @@ static int send_pack(int in, int out, int nr_refspec, char **refspec)
 				continue;
 			}
 		}
-		memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
+		hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 		if (is_zero_sha1(ref->new_sha1)) {
 			error("cannot happen anymore");
 			ret = -3;
diff --git a/sha1_file.c b/sha1_file.c
index 066cff1fa6..769a80984d 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -540,7 +540,7 @@ struct packed_git *add_packed_git(char *path, int path_len, int local)
 	p->pack_use_cnt = 0;
 	p->pack_local = local;
 	if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
-		memcpy(p->sha1, sha1, 20);
+		hashcpy(p->sha1, sha1);
 	return p;
 }
 
@@ -571,7 +571,7 @@ struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_pa
 	p->pack_base = NULL;
 	p->pack_last_used = 0;
 	p->pack_use_cnt = 0;
-	memcpy(p->sha1, sha1, 20);
+	hashcpy(p->sha1, sha1);
 	return p;
 }
 
@@ -953,7 +953,7 @@ int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
 	ptr = unpack_object_header(p, ptr, kindp, sizep);
 	if (*kindp != OBJ_DELTA)
 		goto done;
-	memcpy(base, (unsigned char *) p->pack_base + ptr, 20);
+	hashcpy(base, (unsigned char *) p->pack_base + ptr);
 	status = 0;
  done:
 	unuse_packed_git(p);
@@ -981,7 +981,7 @@ void packed_object_info_detail(struct pack_entry *e,
 		if (p->pack_size <= offset + 20)
 			die("pack file %s records an incomplete delta base",
 			    p->pack_name);
-		memcpy(base_sha1, pack, 20);
+		hashcpy(base_sha1, pack);
 		do {
 			struct pack_entry base_ent;
 			unsigned long junk;
@@ -1201,7 +1201,7 @@ int nth_packed_object_sha1(const struct packed_git *p, int n,
 	void *index = p->index_base + 256;
 	if (n < 0 || num_packed_objects(p) <= n)
 		return -1;
-	memcpy(sha1, (char *) index + (24 * n) + 4, 20);
+	hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
 	return 0;
 }
 
@@ -1218,7 +1218,7 @@ int find_pack_entry_one(const unsigned char *sha1,
 		int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
 		if (!cmp) {
 			e->offset = ntohl(*((unsigned int *) ((char *) index + (24 * mi))));
-			memcpy(e->sha1, sha1, 20);
+			hashcpy(e->sha1, sha1);
 			e->p = p;
 			return 1;
 		}
@@ -1331,7 +1331,7 @@ void *read_object_with_reference(const unsigned char *sha1,
 	unsigned long isize;
 	unsigned char actual_sha1[20];
 
-	memcpy(actual_sha1, sha1, 20);
+	hashcpy(actual_sha1, sha1);
 	while (1) {
 		int ref_length = -1;
 		const char *ref_type = NULL;
@@ -1342,7 +1342,7 @@ void *read_object_with_reference(const unsigned char *sha1,
 		if (!strcmp(type, required_type)) {
 			*size = isize;
 			if (actual_sha1_return)
-				memcpy(actual_sha1_return, actual_sha1, 20);
+				hashcpy(actual_sha1_return, actual_sha1);
 			return buffer;
 		}
 		/* Handle references */
@@ -1537,7 +1537,7 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
 	 */
 	filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
 	if (returnsha1)
-		memcpy(returnsha1, sha1, 20);
+		hashcpy(returnsha1, sha1);
 	if (has_sha1_file(sha1))
 		return 0;
 	fd = open(filename, O_RDONLY);
diff --git a/sha1_name.c b/sha1_name.c
index e9eb6ce882..3f6b77ccfa 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -103,7 +103,7 @@ static int find_short_packed_object(int len, const unsigned char *match, unsigne
 				    !match_sha(len, match, next)) {
 					/* unique within this pack */
 					if (!found) {
-						memcpy(found_sha1, now, 20);
+						hashcpy(found_sha1, now);
 						found++;
 					}
 					else if (hashcmp(found_sha1, now)) {
@@ -120,7 +120,7 @@ static int find_short_packed_object(int len, const unsigned char *match, unsigne
 		}
 	}
 	if (found == 1)
-		memcpy(sha1, found_sha1, 20);
+		hashcpy(sha1, found_sha1);
 	return found;
 }
 
@@ -140,13 +140,13 @@ static int find_unique_short_object(int len, char *canonical,
 	if (1 < has_unpacked || 1 < has_packed)
 		return SHORT_NAME_AMBIGUOUS;
 	if (has_unpacked != has_packed) {
-		memcpy(sha1, (has_packed ? packed_sha1 : unpacked_sha1), 20);
+		hashcpy(sha1, (has_packed ? packed_sha1 : unpacked_sha1));
 		return 0;
 	}
 	/* Both have unique ones -- do they match? */
 	if (hashcmp(packed_sha1, unpacked_sha1))
 		return SHORT_NAME_AMBIGUOUS;
-	memcpy(sha1, packed_sha1, 20);
+	hashcpy(sha1, packed_sha1);
 	return 0;
 }
 
@@ -159,7 +159,7 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1,
 
 	if (len < MINIMUM_ABBREV)
 		return -1;
-	memset(res, 0, 20);
+	hashclr(res);
 	memset(canonical, 'x', 40);
 	for (i = 0; i < len ;i++) {
 		unsigned char c = name[i];
@@ -320,13 +320,13 @@ static int get_parent(const char *name, int len,
 	if (parse_commit(commit))
 		return -1;
 	if (!idx) {
-		memcpy(result, commit->object.sha1, 20);
+		hashcpy(result, commit->object.sha1);
 		return 0;
 	}
 	p = commit->parents;
 	while (p) {
 		if (!--idx) {
-			memcpy(result, p->item->object.sha1, 20);
+			hashcpy(result, p->item->object.sha1);
 			return 0;
 		}
 		p = p->next;
@@ -347,9 +347,9 @@ static int get_nth_ancestor(const char *name, int len,
 
 		if (!commit || parse_commit(commit) || !commit->parents)
 			return -1;
-		memcpy(sha1, commit->parents->item->object.sha1, 20);
+		hashcpy(sha1, commit->parents->item->object.sha1);
 	}
-	memcpy(result, sha1, 20);
+	hashcpy(result, sha1);
 	return 0;
 }
 
@@ -401,7 +401,7 @@ static int peel_onion(const char *name, int len, unsigned char *sha1)
 		o = deref_tag(o, name, sp - name - 2);
 		if (!o || (!o->parsed && !parse_object(o->sha1)))
 			return -1;
-		memcpy(sha1, o->sha1, 20);
+		hashcpy(sha1, o->sha1);
 	}
 	else {
 		/* At this point, the syntax look correct, so
@@ -413,7 +413,7 @@ static int peel_onion(const char *name, int len, unsigned char *sha1)
 			if (!o || (!o->parsed && !parse_object(o->sha1)))
 				return -1;
 			if (o->type == expected_type) {
-				memcpy(sha1, o->sha1, 20);
+				hashcpy(sha1, o->sha1);
 				return 0;
 			}
 			if (o->type == OBJ_TAG)
@@ -520,7 +520,7 @@ int get_sha1(const char *name, unsigned char *sha1)
 			    memcmp(ce->name, cp, namelen))
 				break;
 			if (ce_stage(ce) == stage) {
-				memcpy(sha1, ce->sha1, 20);
+				hashcpy(sha1, ce->sha1);
 				return 0;
 			}
 			pos++;
diff --git a/tree-walk.c b/tree-walk.c
index 3f83e98f3a..14cc5aea6c 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -179,7 +179,7 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
 		if (cmp < 0)
 			break;
 		if (entrylen == namelen) {
-			memcpy(result, sha1, 20);
+			hashcpy(result, sha1);
 			return 0;
 		}
 		if (name[entrylen] != '/')
@@ -187,7 +187,7 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
 		if (!S_ISDIR(*mode))
 			break;
 		if (++entrylen == namelen) {
-			memcpy(result, sha1, 20);
+			hashcpy(result, sha1);
 			return 0;
 		}
 		return get_tree_entry(sha1, name + entrylen, result, mode);
diff --git a/tree.c b/tree.c
index ef456be9dd..ea386e5066 100644
--- a/tree.c
+++ b/tree.c
@@ -25,7 +25,7 @@ static int read_one_entry(const unsigned char *sha1, const char *base, int basel
 	ce->ce_flags = create_ce_flags(baselen + len, stage);
 	memcpy(ce->name, base, baselen);
 	memcpy(ce->name + baselen, pathname, len+1);
-	memcpy(ce->sha1, sha1, 20);
+	hashcpy(ce->sha1, sha1);
 	return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
 }
 
diff --git a/unpack-trees.c b/unpack-trees.c
index 467d9940f5..3ac0289b3a 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -200,7 +200,7 @@ static int unpack_trees_rec(struct tree_entry_list **posns, int len,
 
 			any_files = 1;
 
-			memcpy(ce->sha1, posns[i]->sha1, 20);
+			hashcpy(ce->sha1, posns[i]->sha1);
 			src[i + o->merge] = ce;
 			subposns[i] = df_conflict_list;
 			posns[i] = posns[i]->next;
diff --git a/upload-pack.c b/upload-pack.c
index fcf279843a..51ce936b06 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -374,7 +374,7 @@ static int get_common_commits(void)
 					     sha1_to_hex(sha1),
 					     multi_ack ?  " continue" : "");
 				if (multi_ack)
-					memcpy(last_sha1, sha1, 20);
+					hashcpy(last_sha1, sha1);
 			}
 			continue;
 		}