2 files changed, 22 insertions, 3 deletions
diff --git a/nest/a-path.c b/nest/a-path.c
index ca39e296..d808bc9a 100644
--- a/nest/a-path.c
+++ b/nest/a-path.c
@@ -81,3 +81,21 @@ as_path_format(struct adata *path, byte *buf, unsigned int size)
     }
   *buf = 0;
 }
+
+int
+as_path_getlen(struct adata *path)
+{
+  int res = 0;
+  u8 *p = path->data;
+  u8 *q = p+path->length;
+  int len;
+
+  while (p<q) {
+    switch (*p++) {
+    case 1: len = *p++; res++;    p += 2*len; break;
+    case 2: len = *p++; res+=len; p += 2*len; break;
+    default: bug("This should not be in path");
+    }
+  }
+  return res;
+}
diff --git a/nest/attrs.h b/nest/attrs.h
index fc960fb5..67ec52d8 100644
--- a/nest/attrs.h
+++ b/nest/attrs.h
@@ -11,12 +11,13 @@
 
 /* a-path.c */
 
-struct adata *as_path_prepend(struct linpool *pool, struct adata *olda, int as);
-void as_path_format(struct adata *path, byte *buf, unsigned int size);
-
 #define AS_PATH_SET		1	/* Types of path segments */
 #define AS_PATH_SEQUENCE	2
 
+struct adata *as_path_prepend(struct linpool *pool, struct adata *olda, int as);
+void as_path_format(struct adata *path, byte *buf, unsigned int size);
+int as_path_getlen(struct adata *path);
+
 /* a-set.c */
 
 void int_set_format(struct adata *set, byte *buf, unsigned int size);