From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56314) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zf27W-0001Pc-MC for qemu-devel@nongnu.org; Thu, 24 Sep 2015 04:43:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zf27T-0006Jk-DL for qemu-devel@nongnu.org; Thu, 24 Sep 2015 04:43:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38635) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zf27T-0006Jc-8X for qemu-devel@nongnu.org; Thu, 24 Sep 2015 04:43:11 -0400 From: Gerd Hoffmann Date: Thu, 24 Sep 2015 10:42:03 +0200 Message-Id: <1443084128-25552-6-git-send-email-kraxel@redhat.com> In-Reply-To: <1443084128-25552-1-git-send-email-kraxel@redhat.com> References: <1443084128-25552-1-git-send-email-kraxel@redhat.com> Subject: [Qemu-devel] [RfC PATCH 05/10] io: add qio_buffer_move_empty List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Lieven , Gerd Hoffmann Signed-off-by: Gerd Hoffmann --- include/io/buffer.h | 10 ++++++++++ io/buffer.c | 14 ++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/io/buffer.h b/include/io/buffer.h index cffad19..1dddc73 100644 --- a/include/io/buffer.h +++ b/include/io/buffer.h @@ -127,4 +127,14 @@ uint8_t *qio_buffer_end(QIOBuffer *buffer); */ gboolean qio_buffer_empty(QIOBuffer *buffer); +/** + * qio_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 qio_buffer_move_empty(QIOBuffer *to, QIOBuffer *from); + #endif /* QIO_BUFFER_H__ */ diff --git a/io/buffer.c b/io/buffer.c index daa3ebf..09ca321 100644 --- a/io/buffer.c +++ b/io/buffer.c @@ -77,3 +77,17 @@ void qio_buffer_advance(QIOBuffer *buffer, size_t len) (buffer->offset - len)); buffer->offset -= len; } + +void qio_buffer_move_empty(QIOBuffer *to, QIOBuffer *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