combine-diff: combine_diff_path.len is not needed anymore

The field was used in order to speed-up name comparison and also to
mark removed paths by setting it to 0.

Because the updated code does significantly less strcmp and also
just removes paths from the list and free right after we know a path
will not be needed, it is not needed anymore.

Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

3 files changed, 9 insertions, 24 deletions

diff --git a/combine-diff.c b/combine-diff.c
index d7692d7073..2d79312a0b 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -31,7 +31,6 @@ static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr,
 			p->path = (char *) &(p->parent[num_parent]);
 			memcpy(p->path, path, len);
 			p->path[len] = 0;
-			p->len = len;
 			p->next = NULL;
 			memset(p->parent, 0,
 			       sizeof(p->parent[0]) * num_parent);
@@ -1234,8 +1233,6 @@ void show_combined_diff(struct combine_diff_path *p,
 {
 	struct diff_options *opt = &rev->diffopt;
 
-	if (!p->len)
-		return;
 	if (opt->output_format & (DIFF_FORMAT_RAW |
 				  DIFF_FORMAT_NAME |
 				  DIFF_FORMAT_NAME_STATUS))
@@ -1299,11 +1296,8 @@ static void handle_combined_callback(struct diff_options *opt,
 	q.queue = xcalloc(num_paths, sizeof(struct diff_filepair *));
 	q.alloc = num_paths;
 	q.nr = num_paths;
-	for (i = 0, p = paths; p; p = p->next) {
-		if (!p->len)
-			continue;
+	for (i = 0, p = paths; p; p = p->next)
 		q.queue[i++] = combined_pair(p, num_parent);
-	}
 	opt->format_callback(&q, opt, opt->format_callback_data);
 	for (i = 0; i < num_paths; i++)
 		free_combined_pair(q.queue[i]);
@@ -1369,11 +1363,9 @@ void diff_tree_combined(const unsigned char *sha1,
 		diff_flush(&diffopts);
 	}
 
-	/* find out surviving paths */
-	for (num_paths = 0, p = paths; p; p = p->next) {
-		if (p->len)
-			num_paths++;
-	}
+	/* find out number of surviving paths */
+	for (num_paths = 0, p = paths; p; p = p->next)
+		num_paths++;
 
 	/* order paths according to diffcore_order */
 	if (opt->orderfile && num_paths) {
@@ -1399,10 +1391,8 @@ void diff_tree_combined(const unsigned char *sha1,
 		if (opt->output_format & (DIFF_FORMAT_RAW |
 					  DIFF_FORMAT_NAME |
 					  DIFF_FORMAT_NAME_STATUS)) {
-			for (p = paths; p; p = p->next) {
-				if (p->len)
-					show_raw_diff(p, num_parent, rev);
-			}
+			for (p = paths; p; p = p->next)
+				show_raw_diff(p, num_parent, rev);
 			needsep = 1;
 		}
 		else if (opt->output_format &
@@ -1415,11 +1405,9 @@ void diff_tree_combined(const unsigned char *sha1,
 			if (needsep)
 				printf("%s%c", diff_line_prefix(opt),
 				       opt->line_termination);
-			for (p = paths; p; p = p->next) {
-				if (p->len)
-					show_patch_diff(p, num_parent, dense,
-							0, rev);
-			}
+			for (p = paths; p; p = p->next)
+				show_patch_diff(p, num_parent, dense,
+						0, rev);
 		}
 	}
 
diff --git a/diff-lib.c b/diff-lib.c
index 346cac651d..bf624e7716 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -124,7 +124,6 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
 			dpath->path = (char *) &(dpath->parent[5]);
 
 			dpath->next = NULL;
-			dpath->len = path_len;
 			memcpy(dpath->path, ce->name, path_len);
 			dpath->path[path_len] = '\0';
 			hashclr(dpath->sha1);
@@ -326,7 +325,6 @@ static int show_modified(struct rev_info *revs,
 		p = xmalloc(combine_diff_path_size(2, pathlen));
 		p->path = (char *) &p->parent[2];
 		p->next = NULL;
-		p->len = pathlen;
 		memcpy(p->path, new->name, pathlen);
 		p->path[pathlen] = 0;
 		p->mode = mode;
diff --git a/diff.h b/diff.h
index ce123fa06f..e79f3b3ff0 100644
--- a/diff.h
+++ b/diff.h
@@ -198,7 +198,6 @@ extern int diff_root_tree_sha1(const unsigned char *new, const char *base,
 
 struct combine_diff_path {
 	struct combine_diff_path *next;
-	int len;
 	char *path;
 	unsigned int mode;
 	unsigned char sha1[20];