highlight optionality


git-svn-id: https://asn1c.svn.sourceforge.net/svnroot/asn1c/trunk@854 59561ff5-6e30-0410-9f3c-9617f08c8826
diff --git a/skeletons/OBJECT_IDENTIFIER.c b/skeletons/OBJECT_IDENTIFIER.c
index 7c9c980..0c16bfd 100644
--- a/skeletons/OBJECT_IDENTIFIER.c
+++ b/skeletons/OBJECT_IDENTIFIER.c
@@ -652,7 +652,7 @@
 
 int
 OBJECT_IDENTIFIER_parse_arcs(const char *oid_text, ssize_t oid_txt_length,
-	long *arcs, unsigned int arcs_slots, const char **oid_text_end) {
+	long *arcs, unsigned int arcs_slots, const char **opt_oid_text_end) {
 	unsigned int arcs_count = 0;
 	const char *oid_end;
 	long value = 0;
@@ -663,7 +663,7 @@
 	} state = ST_SKIPSPACE;
 
 	if(!oid_text || oid_txt_length < -1 || (arcs_slots && !arcs)) {
-		if(oid_text_end) *oid_text_end = oid_text;
+		if(opt_oid_text_end) *opt_oid_text_end = oid_text;
 		errno = EINVAL;
 		return -1;
 	}
@@ -715,7 +715,7 @@
 	} /* for() */
 
 
-	if(oid_text_end) *oid_text_end = oid_text;
+	if(opt_oid_text_end) *opt_oid_text_end = oid_text;
 
 	/* Finalize last arc */
 	switch(state) {