2 files changed, 47 insertions, 0 deletions
diff --git a/nest/a-set.c b/nest/a-set.c
index deef5df..1d2cebf 100644
--- a/nest/a-set.c
+++ b/nest/a-set.c
@@ -38,3 +38,46 @@ int_set_format(struct adata *set, byte *buf, unsigned int size)
     }
   *buf = 0;
 }
+
+struct adata *
+int_set_add(struct linpool *pool, struct adata *list, u32 val)
+{
+  struct adata *res = lp_alloc(pool, list->length + sizeof(struct adata) + 4);
+  res->length = list->length+4;
+  * (u32 *) res->data = val;
+  memcpy((char *) res->data + 4, list->data, list->length);
+  return res;
+}
+
+int
+int_set_contains(struct adata *list, u32 val)
+{
+  u32 *l = &(list->data);
+  int i;
+  for (i=0; i<list->length/4; i++)
+    if (*l++ == val)
+      return 1;
+  return 0;
+}
+
+struct adata *
+int_set_del(struct linpool *pool, struct adata *list, u32 val)
+{
+  struct adata *res;
+  u32 *l, *k;
+  int i;
+
+  if (!int_set_contains(list, val))
+    return list;
+
+  res = lp_alloc(pool, list->length + sizeof(struct adata) - 4);
+  res->length = list->length-4;
+
+  l = &(list->data);
+  k = &(res->data);
+  for (i=0; i<list->length/4; i++)
+    if (l[i] != val)
+      *k++ = l[i];
+
+  return res;
+}
diff --git a/nest/attrs.h b/nest/attrs.h
index ede152c..630550f 100644
--- a/nest/attrs.h
+++ b/nest/attrs.h
@@ -29,5 +29,9 @@ int as_path_match(struct adata *path, struct f_path_mask *mask);
 /* a-set.c */
 
 void int_set_format(struct adata *set, byte *buf, unsigned int size);
+struct adata *int_set_add(struct linpool *pool, struct adata *list, u32 val);
+int int_set_contains(struct adata *list, u32 val);
+struct adata *int_set_del(struct linpool *pool, struct adata *list, u32 val);
+
 
 #endif