refs: factor out set_read_ref_cutoffs()

This block of code is duplicated twice. In a future commit, it will be
duplicated for a third time. Factor out the common functionality into
set_read_ref_cutoffs().

In the case of read_ref_at_ent(), we are incrementing `cb->reccnt` at the
beginning of the function. Move these to right before the return so that
the `cb->reccnt - 1` is changed to `cb->reccnt` and it can be cleanly
factored out into set_read_ref_cutoffs(). The duplication of the
increment statements will be removed in a future patch.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

refs.c

@@ -882,25 +882,30 @@ struct read_ref_at_cb {
 	int *cutoff_cnt;
 };
 
+static void set_read_ref_cutoffs(struct read_ref_at_cb *cb,
+		timestamp_t timestamp, int tz, const char *message)
+{
+	if (cb->msg)
+		*cb->msg = xstrdup(message);
+	if (cb->cutoff_time)
+		*cb->cutoff_time = timestamp;
+	if (cb->cutoff_tz)
+		*cb->cutoff_tz = tz;
+	if (cb->cutoff_cnt)
+		*cb->cutoff_cnt = cb->reccnt;
+}
+
 static int read_ref_at_ent(struct object_id *ooid, struct object_id *noid,
 		const char *email, timestamp_t timestamp, int tz,
 		const char *message, void *cb_data)
 {
 	struct read_ref_at_cb *cb = cb_data;
 
-	cb->reccnt++;
 	cb->tz = tz;
 	cb->date = timestamp;
 
 	if (timestamp <= cb->at_time || cb->cnt == 0) {
-		if (cb->msg)
-			*cb->msg = xstrdup(message);
-		if (cb->cutoff_time)
-			*cb->cutoff_time = timestamp;
-		if (cb->cutoff_tz)
-			*cb->cutoff_tz = tz;
-		if (cb->cutoff_cnt)
-			*cb->cutoff_cnt = cb->reccnt - 1;
+		set_read_ref_cutoffs(cb, timestamp, tz, message);
 		/*
 		 * we have not yet updated cb->[n|o]oid so they still
 		 * hold the values for the previous record.
@@ -917,11 +922,13 @@ static int read_ref_at_ent(struct object_id *ooid, struct object_id *noid,
 			warning(_("log for ref %s unexpectedly ended on %s"),
 				cb->refname, show_date(cb->date, cb->tz,
 						       DATE_MODE(RFC2822)));
+		cb->reccnt++;
 		oidcpy(&cb->ooid, ooid);
 		oidcpy(&cb->noid, noid);
 		cb->found_it = 1;
 		return 1;
 	}
+	cb->reccnt++;
 	oidcpy(&cb->ooid, ooid);
 	oidcpy(&cb->noid, noid);
 	if (cb->cnt > 0)
@@ -935,14 +942,7 @@ static int read_ref_at_ent_oldest(struct object_id *ooid, struct object_id *noid
 {
 	struct read_ref_at_cb *cb = cb_data;
 
-	if (cb->msg)
-		*cb->msg = xstrdup(message);
-	if (cb->cutoff_time)
-		*cb->cutoff_time = timestamp;
-	if (cb->cutoff_tz)
-		*cb->cutoff_tz = tz;
-	if (cb->cutoff_cnt)
-		*cb->cutoff_cnt = cb->reccnt;
+	set_read_ref_cutoffs(cb, timestamp, tz, message);
 	oidcpy(cb->oid, ooid);
 	if (is_null_oid(cb->oid))
 		oidcpy(cb->oid, noid);