Add git_oid_strcmp and use it for git_oid_streq

Add a new git_oid_strcmp that compares a string OID with a hex
oid for sort order, and then reimplement git_oid_streq using it.
This actually should speed up git_oid_streq because it only reads
as far into the string as it needs to, whereas previously it would
convert the whole string into an OID and then use git_oid_cmp.

1 files changed, 10 insertions, 0 deletions

diff --git a/include/git2/oid.h b/include/git2/oid.h
index c35acdcdc..8d93e79cf 100644
--- a/include/git2/oid.h
+++ b/include/git2/oid.h
@@ -202,6 +202,16 @@ GIT_EXTERN(int) git_oid_ncmp(const git_oid *a, const git_oid *b, size_t len);
 GIT_EXTERN(int) git_oid_streq(const git_oid *id, const char *str);
 
 /**
+ * Compare an oid to an hex formatted object id.
+ *
+ * @param id oid structure.
+ * @param str input hex string of an object id.
+ * @return -1 if str is not valid, <0 if id sorts before str,
+ *         0 if id matches str, >0 if id sorts after str.
+ */
+GIT_EXTERN(int) git_oid_strcmp(const git_oid *id, const char *str);
+
+/**
  * Check is an oid is all zeros.
  *
  * @return 1 if all zeros, 0 otherwise.