mirror of
https://github.com/qemu/qemu.git
synced 2024-12-11 12:43:55 +08:00
348e7b8dcd
iov_to_buf() has an 'offset' parameter, iov_from_buf() hasn't. This patch adds the missing parameter to iov_from_buf(). It also renames the 'offset' parameter to 'iov_off' to emphasize it's the offset into the iovec and not the buffer. Signed-off-by: Hannes Reinecke <hare@suse.de> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
|
|
* Helpers for getting linearized buffers from iov / filling buffers into iovs
|
|
*
|
|
* Copyright IBM, Corp. 2007, 2008
|
|
* Copyright (C) 2010 Red Hat, Inc.
|
|
*
|
|
* Author(s):
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
* Amit Shah <amit.shah@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include "iov.h"
|
|
|
|
size_t iov_from_buf(struct iovec *iov, unsigned int iov_cnt,
|
|
const void *buf, size_t iov_off, size_t size)
|
|
{
|
|
size_t iovec_off, buf_off;
|
|
unsigned int i;
|
|
|
|
iovec_off = 0;
|
|
buf_off = 0;
|
|
for (i = 0; i < iov_cnt && size; i++) {
|
|
if (iov_off < (iovec_off + iov[i].iov_len)) {
|
|
size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off, size);
|
|
|
|
memcpy(iov[i].iov_base + (iov_off - iovec_off), buf + buf_off, len);
|
|
|
|
buf_off += len;
|
|
iov_off += len;
|
|
size -= len;
|
|
}
|
|
iovec_off += iov[i].iov_len;
|
|
}
|
|
return buf_off;
|
|
}
|
|
|
|
size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
|
|
void *buf, size_t iov_off, size_t size)
|
|
{
|
|
uint8_t *ptr;
|
|
size_t iovec_off, buf_off;
|
|
unsigned int i;
|
|
|
|
ptr = buf;
|
|
iovec_off = 0;
|
|
buf_off = 0;
|
|
for (i = 0; i < iov_cnt && size; i++) {
|
|
if (iov_off < (iovec_off + iov[i].iov_len)) {
|
|
size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size);
|
|
|
|
memcpy(ptr + buf_off, iov[i].iov_base + (iov_off - iovec_off), len);
|
|
|
|
buf_off += len;
|
|
iov_off += len;
|
|
size -= len;
|
|
}
|
|
iovec_off += iov[i].iov_len;
|
|
}
|
|
return buf_off;
|
|
}
|
|
|
|
size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt)
|
|
{
|
|
size_t len;
|
|
unsigned int i;
|
|
|
|
len = 0;
|
|
for (i = 0; i < iov_cnt; i++) {
|
|
len += iov[i].iov_len;
|
|
}
|
|
return len;
|
|
}
|