From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56489) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZyNXF-0003My-IW for qemu-devel@nongnu.org; Mon, 16 Nov 2015 12:25:46 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZyNXA-0000P4-Hf for qemu-devel@nongnu.org; Mon, 16 Nov 2015 12:25:45 -0500 Received: from mx1.redhat.com ([209.132.183.28]:43779) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZyNXA-0000Oo-6e for qemu-devel@nongnu.org; Mon, 16 Nov 2015 12:25:40 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (Postfix) with ESMTPS id D05E52654 for ; Mon, 16 Nov 2015 17:25:39 +0000 (UTC) From: Gerd Hoffmann Date: Mon, 16 Nov 2015 18:25:18 +0100 Message-Id: <1447694735-3420-4-git-send-email-kraxel@redhat.com> In-Reply-To: <1447694735-3420-1-git-send-email-kraxel@redhat.com> References: <1447694735-3420-1-git-send-email-kraxel@redhat.com> Subject: [Qemu-devel] [PULL 03/20] buffer: add buffer_move_empty List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Gerd Hoffmann Signed-off-by: Gerd Hoffmann Reviewed-by: Peter Lieven Reviewed-by: Daniel Berrange Message-id: 1446203414-4013-4-git-send-email-kraxel@redhat.com --- include/qemu/buffer.h | 10 ++++++++++ util/buffer.c | 14 ++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/qemu/buffer.h b/include/qemu/buffer.h index 0710e16..f53ee9e 100644 --- a/include/qemu/buffer.h +++ b/include/qemu/buffer.h @@ -127,4 +127,14 @@ uint8_t *buffer_end(Buffer *buffer); */ gboolean buffer_empty(Buffer *buffer); +/** + * buffer_move_empty: + * @to: destination buffer object + * @from: source buffer object + * + * Moves buffer, without copying data. 'to' buffer must be empty. + * 'from' buffer is empty and zero-sized on return. + */ +void buffer_move_empty(Buffer *to, Buffer *from); + #endif /* QEMU_BUFFER_H__ */ diff --git a/util/buffer.c b/util/buffer.c index 12bf2d7..c7a39ec 100644 --- a/util/buffer.c +++ b/util/buffer.c @@ -77,3 +77,17 @@ void buffer_advance(Buffer *buffer, size_t len) (buffer->offset - len)); buffer->offset -= len; } + +void buffer_move_empty(Buffer *to, Buffer *from) +{ + assert(to->offset == 0); + + g_free(to->buffer); + to->offset = from->offset; + to->capacity = from->capacity; + to->buffer = from->buffer; + + from->offset = 0; + from->capacity = 0; + from->buffer = NULL; +} -- 1.8.3.1