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iov: add iov_discard_front/back() to remove data

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The iov_discard_front/back() functions remove data from the front or
back of the vector.  This is useful when peeling off header/footer
structs.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2012-11-21 17:41:10 +01:00
parent 3e9ec52171
commit d02776350d
2 changed files with 64 additions and 0 deletions
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13
include/qemu/iov.h
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@ -99,4 +99,17 @@ unsigned iov_copy(struct iovec *dst_iov, unsigned int dst_iov_cnt,
const struct iovec *iov, unsigned int iov_cnt,
size_t offset, size_t bytes);
/*
* Remove a given number of bytes from the front or back of a vector.
* This may update iov and/or iov_cnt to exclude iovec elements that are
* no longer required.
*
* The number of bytes actually discarded is returned. This number may be
* smaller than requested if the vector is too small.
*/
size_t iov_discard_front(struct iovec **iov, unsigned int *iov_cnt,
size_t bytes);
size_t iov_discard_back(struct iovec *iov, unsigned int *iov_cnt,
size_t bytes);
#endif