oid: define GIT_OID_SHA1_ZERO

Callers should not assume the layout of the oid structure; provide them
a macro that defines the null / zero sha1 object id.

2 files changed, 10 insertions, 5 deletions

diff --git a/include/git2/common.h b/include/git2/common.h
index c3e3e7b4e..ccf66334a 100644
--- a/include/git2/common.h
+++ b/include/git2/common.h
@@ -106,11 +106,6 @@ GIT_BEGIN_DECL
 #define GIT_PATH_MAX 4096
 
 /**
- * The string representation of the null object ID.
- */
-#define GIT_OID_HEX_ZERO "0000000000000000000000000000000000000000"
-
-/**
  * Return the version of the libgit2 library
  * being currently used.
  *
diff --git a/include/git2/oid.h b/include/git2/oid.h
index 0d0f05489..3dedae85e 100644
--- a/include/git2/oid.h
+++ b/include/git2/oid.h
@@ -36,6 +36,16 @@ typedef struct git_oid {
 } git_oid;
 
 /**
+ * The binary representation of the null object ID.
+ */
+#define GIT_OID_SHA1_ZERO { { 0 } }
+
+/**
+ * The string representation of the null object ID.
+ */
+#define GIT_OID_SHA1_HEXZERO "0000000000000000000000000000000000000000"
+
+/**
  * Parse a hex formatted object id into a git_oid.
  *
  * @param out oid structure the result is written into.