From 89556b90f1afb9b7ebe247c05721e0a04a7232c0 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sat, 8 Jun 2002 14:00:33 +0000
Subject: [PATCH] New functions for manipulating attribute lists:
 obj_prepend_attr() and obj_insert_attr().

---
 lib/lib.h    |  2 ++
 lib/object.c | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/lib/lib.h b/lib/lib.h
index 7b406dd9..7c3eb5ff 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -118,6 +118,8 @@ byte *obj_find_aval(struct odes *, uns);
 struct oattr *obj_set_attr(struct odes *, uns, byte *);
 struct oattr *obj_set_attr_num(struct odes *, uns, uns);
 struct oattr *obj_add_attr(struct odes *, struct oattr *, uns, byte *);
+struct oattr *obj_prepend_attr(struct odes *, uns, byte *);
+struct oattr *obj_insert_attr(struct odes *o, struct oattr *first, struct oattr *after, byte *v);
 
 /* Content-Type pattern matching and filters */
 
diff --git a/lib/object.c b/lib/object.c
index 839bc65e..0a068654 100644
--- a/lib/object.c
+++ b/lib/object.c
@@ -222,3 +222,39 @@ obj_add_attr(struct odes *o, struct oattr *a, uns x, byte *v)
   a->last_same = b;
   return a;
 }
+
+struct oattr *
+obj_prepend_attr(struct odes *o, uns x, byte *v)
+{
+  struct oattr *a, *b, **z;
+
+  b = oa_new(o, x, v);
+  z = &o->attrs;
+  while (a = *z)
+    {
+      if (a->attr == x)
+	{
+	  b->same = a;
+	  *z = b;
+	  b->last_same = a->last_same;
+	  return b;
+	}
+      z = &a->next;
+    }
+  b->next = o->attrs;
+  o->attrs = b;
+  return b;
+}
+
+struct oattr *
+obj_insert_attr(struct odes *o, struct oattr *first, struct oattr *after, byte *v)
+{
+  struct oattr *b;
+
+  b = oa_new(o, first->attr, v);
+  b->same = after->same;
+  after->same = b;
+  if (first->last_same == after)
+    first->last_same = b;
+  return b;
+}
-- 
2.39.2