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140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/* $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
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/*
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* Copyright (c) 1999 Theo de Raadt
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/uio.h>
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#include <opencrypto/cryptodev.h>
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void
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cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
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{
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struct iovec *iov = uio->uio_iov;
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int iol = uio->uio_iovcnt;
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unsigned count;
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if (off < 0)
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panic("cuio_copydata: off %d < 0", off);
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if (len < 0)
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panic("cuio_copydata: len %d < 0", len);
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while (off > 0) {
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if (iol == 0)
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panic("iov_copydata: empty in skip");
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if (off < iov->iov_len)
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break;
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off -= iov->iov_len;
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iol--;
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iov++;
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}
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while (len > 0) {
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if (iol == 0)
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panic("cuio_copydata: empty");
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count = min(iov->iov_len - off, len);
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bcopy(((caddr_t)iov->iov_base) + off, cp, count);
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len -= count;
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cp += count;
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off = 0;
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iol--;
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iov++;
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}
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}
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void
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cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
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{
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struct iovec *iov = uio->uio_iov;
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int iol = uio->uio_iovcnt;
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unsigned count;
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if (off < 0)
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panic("cuio_copyback: off %d < 0", off);
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if (len < 0)
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panic("cuio_copyback: len %d < 0", len);
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while (off > 0) {
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if (iol == 0)
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panic("cuio_copyback: empty in skip");
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if (off < iov->iov_len)
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break;
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off -= iov->iov_len;
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iol--;
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iov++;
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}
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while (len > 0) {
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if (iol == 0)
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panic("uio_copyback: empty");
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count = min(iov->iov_len - off, len);
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bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
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len -= count;
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cp += count;
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off = 0;
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iol--;
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iov++;
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}
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}
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/*
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* Return a pointer to iov/offset of location in iovec list.
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*/
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struct iovec *
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cuio_getptr(struct uio *uio, int loc, int *off)
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{
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struct iovec *iov = uio->uio_iov;
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int iol = uio->uio_iovcnt;
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while (loc >= 0) {
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/* Normal end of search */
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if (loc < iov->iov_len) {
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*off = loc;
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return (iov);
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}
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loc -= iov->iov_len;
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if (iol == 0) {
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if (loc == 0) {
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/* Point at the end of valid data */
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*off = iov->iov_len;
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return (iov);
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} else
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return (NULL);
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} else {
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iov++, iol--;
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}
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}
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return (NULL);
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}
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