criov.c

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    1 /*      $FreeBSD$       */
    2 /*      $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
    3 
    4 /*
    5  * Copyright (c) 1999 Theo de Raadt
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *   notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *   notice, this list of conditions and the following disclaimer in the
   15  *   documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *   derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/proc.h>
   34 #include <sys/errno.h>
   35 #include <sys/malloc.h>
   36 #include <sys/kernel.h>
   37 #include <sys/uio.h>
   38 
   39 #include <opencrypto/cryptodev.h>
   40 
   41 void
   42 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
   43 {
   44         struct iovec *iov = uio->uio_iov;
   45         int iol = uio->uio_iovcnt;
   46         unsigned count;
   47 
   48         if (off < 0)
   49                 panic("cuio_copydata: off %d < 0", off);
   50         if (len < 0)
   51                 panic("cuio_copydata: len %d < 0", len);
   52         while (off > 0) {
   53                 if (iol == 0)
   54                         panic("iov_copydata: empty in skip");
   55                 if (off < iov->iov_len)
   56                         break;
   57                 off -= iov->iov_len;
   58                 iol--;
   59                 iov++;
   60         }
   61         while (len > 0) {
   62                 if (iol == 0)
   63                         panic("cuio_copydata: empty");
   64                 count = min(iov->iov_len - off, len);
   65                 bcopy(((caddr_t)iov->iov_base) + off, cp, count);
   66                 len -= count;
   67                 cp += count;
   68                 off = 0;
   69                 iol--;
   70                 iov++;
   71         }
   72 }
   73 
   74 void
   75 cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
   76 {
   77         struct iovec *iov = uio->uio_iov;
   78         int iol = uio->uio_iovcnt;
   79         unsigned count;
   80 
   81         if (off < 0)
   82                 panic("cuio_copyback: off %d < 0", off);
   83         if (len < 0)
   84                 panic("cuio_copyback: len %d < 0", len);
   85         while (off > 0) {
   86                 if (iol == 0)
   87                         panic("cuio_copyback: empty in skip");
   88                 if (off < iov->iov_len)
   89                         break;
   90                 off -= iov->iov_len;
   91                 iol--;
   92                 iov++;
   93         }
   94         while (len > 0) {
   95                 if (iol == 0)
   96                         panic("uio_copyback: empty");
   97                 count = min(iov->iov_len - off, len);
   98                 bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
   99                 len -= count;
  100                 cp += count;
  101                 off = 0;
  102                 iol--;
  103                 iov++;
  104         }
  105 }
  106 
  107 /*
  108  * Return a pointer to iov/offset of location in iovec list.
  109  */
  110 struct iovec *
  111 cuio_getptr(struct uio *uio, int loc, int *off)
  112 {
  113         struct iovec *iov = uio->uio_iov;
  114         int iol = uio->uio_iovcnt;
  115 
  116         while (loc >= 0) {
  117                 /* Normal end of search */
  118                 if (loc < iov->iov_len) {
  119                         *off = loc;
  120                         return (iov);
  121                 }
  122 
  123                 loc -= iov->iov_len;
  124                 if (iol == 0) {
  125                         if (loc == 0) {
  126                                 /* Point at the end of valid data */
  127                                 *off = iov->iov_len;
  128                                 return (iov);
  129                         } else
  130                                 return (NULL);
  131                 } else {
  132                         iov++, iol--;
  133                 }
  134         }
  135 
  136         return (NULL);
  137 }

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FreeBSD/Linux Kernel Cross Reference sys/opencrypto/criov.c

FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/criov.c