Add the apr_buffer API.

An APR buffer is a structure that can contain a zero terminated string, or
a non zero terminated block of memory, and allow such structures to be
passed around and handled in a memory efficient way.

We allow two buffers to be compared without duplicating strings. Memory
buffers can be converted to string buffers safely. The contents of buffers
can be copied into and out of other systems like caches using memory
allocation callbacks.

Used by the new LDAP API, where string support has been deprecated in
favour of fixed sized buffers.


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1917047 13f79535-47bb-0310-9956-ffa450edef68

CHANGES

@@ -1,6 +1,8 @@
                                                      -*- coding: utf-8 -*-
 Changes for APR 2.0.0
 
+  *) apr_buffer: Add the apr_buffer API. [Graham Leggett]
+
   *) apr_escape: Add apr_escape_json() and apr_pescape_json().
      [Graham Leggett]