167 lines
3.9 KiB
C
167 lines
3.9 KiB
C
/* $OpenBSD: criov.c,v 1.20 2015/03/14 03:38:46 jsg 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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*
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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/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.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, const void *_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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caddr_t cp = (caddr_t)_cp;
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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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int
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cuio_getptr(struct uio *uio, int loc, int *off)
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{
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int ind, len;
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ind = 0;
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while (loc >= 0 && ind < uio->uio_iovcnt) {
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len = uio->uio_iov[ind].iov_len;
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if (len > loc) {
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*off = loc;
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return (ind);
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}
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loc -= len;
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ind++;
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}
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if (ind > 0 && loc == 0) {
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ind--;
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*off = uio->uio_iov[ind].iov_len;
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return (ind);
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}
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return (-1);
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}
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int
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cuio_apply(struct uio *uio, int off, int len,
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int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate)
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{
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int rval, ind, uiolen;
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unsigned int count;
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if (len < 0)
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panic("cuio_apply: len %d < 0", len);
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if (off < 0)
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panic("cuio_apply: off %d < 0", off);
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ind = 0;
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while (off > 0) {
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if (ind >= uio->uio_iovcnt)
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panic("cuio_apply: ind %d >= uio_iovcnt %d for off",
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ind, uio->uio_iovcnt);
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uiolen = uio->uio_iov[ind].iov_len;
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if (off < uiolen)
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break;
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off -= uiolen;
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ind++;
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}
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while (len > 0) {
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if (ind >= uio->uio_iovcnt)
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panic("cuio_apply: ind %d >= uio_iovcnt %d for len",
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ind, uio->uio_iovcnt);
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count = min(uio->uio_iov[ind].iov_len - off, len);
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rval = f(fstate, (char *)uio->uio_iov[ind].iov_base + off,
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count);
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if (rval)
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return (rval);
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len -= count;
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off = 0;
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ind++;
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}
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return (0);
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}
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