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buffer: add buffer_move

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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
This commit is contained in:
Gerd Hoffmann 2015-10-30 12:09:59 +01:00
parent 4d1eb5fdb1
commit 830a958320
2 changed files with 26 additions and 0 deletions
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10
include/qemu/buffer.h
View File

@ -137,4 +137,14 @@ gboolean buffer_empty(Buffer *buffer);
*/ */
void buffer_move_empty(Buffer *to, Buffer *from); void buffer_move_empty(Buffer *to, Buffer *from);
/**
* buffer_move:
* @to: destination buffer object
* @from: source buffer object
*
* Moves buffer, copying data (unless 'to' buffer happens to be empty).
* 'from' buffer is empty and zero-sized on return.
*/
void buffer_move(Buffer *to, Buffer *from);
#endif /* QEMU_BUFFER_H__ */ #endif /* QEMU_BUFFER_H__ */

16
util/buffer.c
View File

@ -91,3 +91,19 @@ void buffer_move_empty(Buffer *to, Buffer *from)
from->capacity = 0; from->capacity = 0;
from->buffer = NULL; from->buffer = NULL;
} }
void buffer_move(Buffer *to, Buffer *from)
{
if (to->offset == 0) {
buffer_move_empty(to, from);
return;
}
buffer_reserve(to, from->offset);
buffer_append(to, from->buffer, from->offset);
g_free(from->buffer);
from->offset = 0;
from->capacity = 0;
from->buffer = NULL;
}