buffer: add buffer_shrink

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1446203414-4013-6-git-send-email-kraxel@redhat.com

1 files changed, 10 insertions, 0 deletions

diff --git a/include/qemu/buffer.h b/include/qemu/buffer.h
index 1358df1aac..0a69b3a972 100644
--- a/include/qemu/buffer.h
+++ b/include/qemu/buffer.h
@@ -52,6 +52,16 @@ void buffer_init(Buffer *buffer, const char *name, ...)
         GCC_FMT_ATTR(2, 3);
 
 /**
+ * buffer_shrink:
+ * @buffer: the buffer object
+ *
+ * Try to shrink the buffer.  Checks current buffer capacity and size
+ * and reduces capacity in case only a fraction of the buffer is
+ * actually used.
+ */
+void buffer_shrink(Buffer *buffer);
+
+/**
  * buffer_reserve:
  * @buffer: the buffer object
  * @len: the minimum required free space