use strip_suffix instead of ends_with in simple cases

When stripping a suffix like:

  if (ends_with(str, "foo"))
	buf = xmemdupz(str, strlen(str) - 3);

we can instead use strip_suffix to avoid the constant 3,
which must match the literal "foo" (we sometimes use
strlen("foo") instead, but that means we are repeating
ourselves). The example above becomes:

  if (strip_suffix(str, "foo", &len))
	buf = xmemdupz(str, len);

This also saves a strlen(), since we calculate the string
length when detecting the suffix.

Note that in some cases we also switch from xstrndup to
xmemdupz, which saves a further strlen call.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/builtin/remote.c b/builtin/remote.c
index 9b3e368..0a6f3ef 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -265,16 +265,17 @@ static int config_read_branches(const char *key, const char *value, void *cb)
 		struct string_list_item *item;
 		struct branch_info *info;
 		enum { REMOTE, MERGE, REBASE } type;
+		size_t key_len;
 
 		key += 7;
-		if (ends_with(key, ".remote")) {
-			name = xstrndup(key, strlen(key) - 7);
+		if (strip_suffix(key, ".remote", &key_len)) {
+			name = xmemdupz(key, key_len);
 			type = REMOTE;
-		} else if (ends_with(key, ".merge")) {
-			name = xstrndup(key, strlen(key) - 6);
+		} else if (strip_suffix(key, ".merge", &key_len)) {
+			name = xmemdupz(key, key_len);
 			type = MERGE;
-		} else if (ends_with(key, ".rebase")) {
-			name = xstrndup(key, strlen(key) - 7);
+		} else if (strip_suffix(key, ".rebase", &key_len)) {
+			name = xmemdupz(key, key_len);
 			type = REBASE;
 		} else
 			return 0;