--- a/mpffs/ls.c	Mon Jul 01 06:28:30 2013 +0000
+++ b/mpffs/ls.c	Mon Jul 01 06:49:50 2013 +0000
@@ -18,34 +18,29 @@
 
 char workpath[512];
 
+void
+extra_chunk_callback(obj, opaque)
+	struct objinfo *obj;
+	u_long opaque;
+{
+	size_t *accump = (size_t *) opaque;
+	struct chunkinfo chi;
+
+	size_extra_chunk(obj, &chi);
+	*accump += chi.len;
+}
+
 size_t
 get_file_size(head)
 	struct objinfo *head;
 {
-	int ent;
-	struct objinfo ch;
 	struct chunkinfo chi;
 	size_t accum;
 
 	size_head_chunk(head, &chi);
 	accum = chi.len;
-	for (ent = head->descend; ent != 0xFFFF; ent = ch.descend) {
-		ch.entryno = ent;
-		get_index_entry(&ch);
-		if (ch.type != 0xF4) {
-			fprintf(stderr,
-	"file continuation object at index %x: type %02X != expected F4\n",
-				ent, ch.type);
-			break;
-		}
-		validate_chunk(&ch);
-		size_extra_chunk(&ch, &chi);
-		accum += chi.len;
-		if (ch.sibling != 0xFFFF)
-			fprintf(stderr,
-"warning: file continuation object (index %x) has a non-nil sibling pointer\n",
-				ent);
-	}
+	iterate_extra_chunks(head->descend, extra_chunk_callback,
+				(u_long) &accum);
 	return(accum);
 }