criov.c

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    1 /*      $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1999 Theo de Raadt
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *   notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *   notice, this list of conditions and the following disclaimer in the
   14  *   documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *   derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/5.2/sys/opencrypto/criov.c 116191 2003-06-11 05:57:50Z obrien $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/proc.h>
   36 #include <sys/errno.h>
   37 #include <sys/malloc.h>
   38 #include <sys/kernel.h>
   39 #include <sys/uio.h>
   40 
   41 #include <opencrypto/cryptodev.h>
   42 
   43 void
   44 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
   45 {
   46         struct iovec *iov = uio->uio_iov;
   47         int iol = uio->uio_iovcnt;
   48         unsigned count;
   49 
   50         if (off < 0)
   51                 panic("cuio_copydata: off %d < 0", off);
   52         if (len < 0)
   53                 panic("cuio_copydata: len %d < 0", len);
   54         while (off > 0) {
   55                 if (iol == 0)
   56                         panic("iov_copydata: empty in skip");
   57                 if (off < iov->iov_len)
   58                         break;
   59                 off -= iov->iov_len;
   60                 iol--;
   61                 iov++;
   62         }
   63         while (len > 0) {
   64                 if (iol == 0)
   65                         panic("cuio_copydata: empty");
   66                 count = min(iov->iov_len - off, len);
   67                 bcopy(((caddr_t)iov->iov_base) + off, cp, count);
   68                 len -= count;
   69                 cp += count;
   70                 off = 0;
   71                 iol--;
   72                 iov++;
   73         }
   74 }
   75 
   76 void
   77 cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
   78 {
   79         struct iovec *iov = uio->uio_iov;
   80         int iol = uio->uio_iovcnt;
   81         unsigned count;
   82 
   83         if (off < 0)
   84                 panic("cuio_copyback: off %d < 0", off);
   85         if (len < 0)
   86                 panic("cuio_copyback: len %d < 0", len);
   87         while (off > 0) {
   88                 if (iol == 0)
   89                         panic("cuio_copyback: empty in skip");
   90                 if (off < iov->iov_len)
   91                         break;
   92                 off -= iov->iov_len;
   93                 iol--;
   94                 iov++;
   95         }
   96         while (len > 0) {
   97                 if (iol == 0)
   98                         panic("uio_copyback: empty");
   99                 count = min(iov->iov_len - off, len);
  100                 bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
  101                 len -= count;
  102                 cp += count;
  103                 off = 0;
  104                 iol--;
  105                 iov++;
  106         }
  107 }
  108 
  109 /*
  110  * Return a pointer to iov/offset of location in iovec list.
  111  */
  112 struct iovec *
  113 cuio_getptr(struct uio *uio, int loc, int *off)
  114 {
  115         struct iovec *iov = uio->uio_iov;
  116         int iol = uio->uio_iovcnt;
  117 
  118         while (loc >= 0) {
  119                 /* Normal end of search */
  120                 if (loc < iov->iov_len) {
  121                         *off = loc;
  122                         return (iov);
  123                 }
  124 
  125                 loc -= iov->iov_len;
  126                 if (iol == 0) {
  127                         if (loc == 0) {
  128                                 /* Point at the end of valid data */
  129                                 *off = iov->iov_len;
  130                                 return (iov);
  131                         } else
  132                                 return (NULL);
  133                 } else {
  134                         iov++, iol--;
  135                 }
  136         }
  137 
  138         return (NULL);
  139 }

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

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