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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
/*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/uio.h>
/*
* same as uiomove() but doesn't modify uio structure.
* return in cbytes how many bytes were copied.
*/
int
uiocopy(void *p, size_t n, enum uio_rw rw, struct uio *uio, size_t *cbytes)
{
struct iovec *iov;
ulong_t cnt;
int error, iovcnt;
iovcnt = uio->uio_iovcnt;
*cbytes = 0;
for (iov = uio->uio_iov; n > 0 && iovcnt > 0; iov++, iovcnt--) {
cnt = MIN(iov->iov_len, n);
if (cnt == 0)
continue;
switch (uio->uio_segflg) {
case UIO_USERSPACE:
if (rw == UIO_READ)
error = copyout(p, iov->iov_base, cnt);
else
error = copyin(iov->iov_base, p, cnt);
if (error)
return (error);
break;
case UIO_SYSSPACE:
if (uio->uio_rw == UIO_READ)
bcopy(p, iov->iov_base, cnt);
else
bcopy(iov->iov_base, p, cnt);
break;
}
p = (caddr_t)p + cnt;
n -= cnt;
*cbytes += cnt;
}
return (0);
}
/*
* Drop the next n chars out of *uiop.
*/
void
uioskip(uio_t *uiop, size_t n)
{
if (n > uiop->uio_resid)
return;
while (n != 0) {
register iovec_t *iovp = uiop->uio_iov;
register size_t niovb = MIN(iovp->iov_len, n);
if (niovb == 0) {
uiop->uio_iov++;
uiop->uio_iovcnt--;
continue;
}
iovp->iov_base += niovb;
uiop->uio_loffset += niovb;
iovp->iov_len -= niovb;
uiop->uio_resid -= niovb;
n -= niovb;
}
}
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