The @-parsing loop unnecessarily checks for the sequence "@{" from
len - 2 unnecessarily. We can safely check from len - 4: write out a
comment justifying this.
Signed-off-by: Ramkumar Ramachandra <[email protected]>
---
sha1_name.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/sha1_name.c b/sha1_name.c
index 3820f28..be1d12c 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -445,7 +445,23 @@ static int get_sha1_basic(const char *str, int len,
unsigned char *sha1)
/* basic@{time or number or -number} format to query ref-log */
reflog_len = at = 0;
if (len && str[len-1] == '}') {
- for (at = len-2; at >= 0; at--) {
+ /* str = @}
+ * ^
+ * len - 2; expression is senseless
+ *
+ * str = @{}
+ * ^
+ * len - 3; expression is still senseless
+ *
+ * str = @{.}
+ * ^
+ * len - 4 where . is any character; expression
+ * is worth investigating
+ *
+ * Therefore, if str ends with }, search three
+ * characters earlier for @{
+ */
+ for (at = len - 4; at >= 0; at--) {
if (str[at] == '@' && str[at+1] == '{') {
if (!upstream_mark(str + at, len - at)) {
reflog_len = (len-1) - (at+2);
--
1.8.3.rc0.24.g6456091
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