mirror of https://gitee.com/openkylin/qemu.git
buffer: add buffer_move
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: 1446203414-4013-5-git-send-email-kraxel@redhat.com
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@ -137,4 +137,14 @@ gboolean buffer_empty(Buffer *buffer);
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*/
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void buffer_move_empty(Buffer *to, Buffer *from);
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/**
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* buffer_move:
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* @to: destination buffer object
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* @from: source buffer object
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*
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* Moves buffer, copying data (unless 'to' buffer happens to be empty).
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* 'from' buffer is empty and zero-sized on return.
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*/
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void buffer_move(Buffer *to, Buffer *from);
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#endif /* QEMU_BUFFER_H__ */
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@ -91,3 +91,19 @@ void buffer_move_empty(Buffer *to, Buffer *from)
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from->capacity = 0;
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from->buffer = NULL;
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}
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void buffer_move(Buffer *to, Buffer *from)
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{
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if (to->offset == 0) {
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buffer_move_empty(to, from);
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return;
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}
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buffer_reserve(to, from->offset);
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buffer_append(to, from->buffer, from->offset);
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g_free(from->buffer);
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from->offset = 0;
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from->capacity = 0;
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from->buffer = NULL;
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}
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