more ivr stuff (not done)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@693 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_buffer.h

@@ -104,6 +104,11 @@ SWITCH_DECLARE(int) switch_buffer_write(switch_buffer *buffer, void *data, size_
  * \return int size of buffer, or 0 if unable to toss that much data
  */
 SWITCH_DECLARE(int) switch_buffer_toss(switch_buffer *buffer, size_t datalen);
+
+/*! \brief Remove all data from the buffer
+ * \param buffer any buffer of type switch_buffer
+ */
+SWITCH_DECLARE(void) switch_buffer_zero(switch_buffer *buffer);
 /** @} */