New abstract list operation 'node_set_value'.

[gnulib.git] / lib / gl_sublist.c

diff --git a/lib/gl_sublist.c b/lib/gl_sublist.c
index 0760cbd..19158d0 100644 (file)
--- a/lib/gl_sublist.c
+++ b/lib/gl_sublist.c
@@ -1,5 +1,5 @@
 /* Sequential list data type backed by another list.
-   Copyright (C) 2006-2007 Free Software Foundation, Inc.
+   Copyright (C) 2006-2008 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2006.
 
    This program is free software: you can redistribute it and/or modify
@@ -87,6 +87,16 @@ gl_sublist_node_value (gl_list_t list, gl_list_node_t node)
   return gl_list_get_at (list->whole, list->start + index);
 }
 
+static void
+gl_sublist_node_set_value (gl_list_t list, gl_list_node_t node, const void *elt)
+{
+  uintptr_t index = NODE_TO_INDEX (node);
+  if (!(index < list->end - list->start))
+    /* Invalid argument.  */
+    abort ();
+  gl_list_set_at (list->whole, list->start + index, elt);
+}
+
 static gl_list_node_t
 gl_sublist_next_node (gl_list_t list, gl_list_node_t node)
 {
@@ -397,6 +407,7 @@ static const struct gl_list_implementation gl_sublist_list_implementation =
     gl_sublist_create_fill,
     gl_sublist_size,
     gl_sublist_node_value,
+    gl_sublist_node_set_value,
     gl_sublist_next_node,
     gl_sublist_previous_node,
     gl_sublist_get_at,