64b63d9e3e
Several of the IOV functions in iov.c, and also tap_send_frames_passt() needs to determine which buffer element a byte offset into an IO vector lies in. Split this out into a helper function iov_skip_bytes(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
31 lines
981 B
C
31 lines
981 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* iov.c - helpers for using (partial) iovecs.
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*
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* Copyrigh Red Hat
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* Author: Laurent Vivier <lvivier@redhat.com>
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*
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* This file also contains code originally from QEMU include/qemu/iov.h:
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*
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* Author(s):
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* Amit Shah <amit.shah@redhat.com>
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* Michael Tokarev <mjt@tls.msk.ru>
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*/
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#ifndef IOVEC_H
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#define IOVEC_H
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#include <unistd.h>
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#include <string.h>
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size_t iov_skip_bytes(const struct iovec *iov, size_t n,
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size_t vec_offset, size_t *buf_offset);
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size_t iov_from_buf(const struct iovec *iov, size_t iov_cnt,
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size_t offset, const void *buf, size_t bytes);
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size_t iov_to_buf(const struct iovec *iov, size_t iov_cnt,
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size_t offset, void *buf, size_t bytes);
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size_t iov_size(const struct iovec *iov, size_t iov_cnt);
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unsigned iov_copy(struct iovec *dst_iov, size_t dst_iov_cnt,
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const struct iovec *iov, size_t iov_cnt,
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size_t offset, size_t bytes);
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#endif /* IOVEC_H */
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