Subject: [PATCH v5 12/15] diff --color-moved: stop clearing potential moved blocks

From: "Phillip Wood via GitGitGadget" <[email-masked]>
Date: Thu, 09 Dec 2021 10:30:06 +0000

From: Phillip Wood <[email-masked]>

moved_block_clear() was introduced in 74d156f4a1 ("diff
--color-moved-ws: fix double free crash", 2018-10-04) to free the
memory that was allocated when initializing a potential moved
block. However since 21536d077f ("diff --color-moved-ws: modify
allow-indentation-change", 2018-11-23) initializing a potential moved
block no longer allocates any memory. Up until the last commit we were
relying on moved_block_clear() to set the `match` pointer to NULL when
a block stopped matching, but since that commit we do not clear a
moved block that does not match so it does not make sense to clear
them elsewhere.

Signed-off-by: Phillip Wood <[email-masked]>
---
 diff.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/diff.c b/diff.c
index 626fd47aa0e..ffbe09937bc 100644
--- a/diff.c
+++ b/diff.c
@@ -807,11 +807,6 @@ struct moved_block {
 	int wsd; /* The whitespace delta of this block */
 };
 
-static void moved_block_clear(struct moved_block *b)
-{
-	memset(b, 0, sizeof(*b));
-}
-
 #define INDENT_BLANKLINE INT_MIN
 
 static void fill_es_indent_data(struct emitted_diff_symbol *es)
@@ -1128,8 +1123,6 @@ static void mark_color_as_moved(struct diff_options *o,
 		}
 
 		if (pmb_nr && (!match || l->s != moved_symbol)) {
-			int i;
-
 			if (!adjust_last_block(o, n, block_length) &&
 			    block_length > 1) {
 				/*
@@ -1139,8 +1132,6 @@ static void mark_color_as_moved(struct diff_options *o,
 				match = NULL;
 				n -= block_length;
 			}
-			for(i = 0; i < pmb_nr; i++)
-				moved_block_clear(&pmb[i]);
 			pmb_nr = 0;
 			block_length = 0;
 			flipped_block = 0;
@@ -1193,8 +1184,6 @@ static void mark_color_as_moved(struct diff_options *o,
 	}
 	adjust_last_block(o, n, block_length);
 
-	for(n = 0; n < pmb_nr; n++)
-		moved_block_clear(&pmb[n]);
 	free(pmb);
 }
 
-- 
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