criov.c

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    1 /*      $OpenBSD: criov.c,v 1.20 2015/03/14 03:38:46 jsg 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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/errno.h>
   31 #include <sys/kernel.h>
   32 #include <sys/mbuf.h>
   33 
   34 void
   35 cuio_copydata(struct uio *uio, int off, int len, caddr_t cp)
   36 {
   37         struct iovec *iov = uio->uio_iov;
   38         int iol = uio->uio_iovcnt;
   39         unsigned count;
   40 
   41         if (off < 0)
   42                 panic("cuio_copydata: off %d < 0", off);
   43         if (len < 0)
   44                 panic("cuio_copydata: len %d < 0", len);
   45         while (off > 0) {
   46                 if (iol == 0)
   47                         panic("iov_copydata: empty in skip");
   48                 if (off < iov->iov_len)
   49                         break;
   50                 off -= iov->iov_len;
   51                 iol--;
   52                 iov++;
   53         }
   54         while (len > 0) {
   55                 if (iol == 0)
   56                         panic("cuio_copydata: empty");
   57                 count = min(iov->iov_len - off, len);
   58                 bcopy(((caddr_t)iov->iov_base) + off, cp, count);
   59                 len -= count;
   60                 cp += count;
   61                 off = 0;
   62                 iol--;
   63                 iov++;
   64         }
   65 }
   66 
   67 void
   68 cuio_copyback(struct uio *uio, int off, int len, const void *_cp)
   69 {
   70         struct iovec *iov = uio->uio_iov;
   71         int iol = uio->uio_iovcnt;
   72         unsigned count;
   73         caddr_t cp = (caddr_t)_cp;
   74 
   75         if (off < 0)
   76                 panic("cuio_copyback: off %d < 0", off);
   77         if (len < 0)
   78                 panic("cuio_copyback: len %d < 0", len);
   79         while (off > 0) {
   80                 if (iol == 0)
   81                         panic("cuio_copyback: empty in skip");
   82                 if (off < iov->iov_len)
   83                         break;
   84                 off -= iov->iov_len;
   85                 iol--;
   86                 iov++;
   87         }
   88         while (len > 0) {
   89                 if (iol == 0)
   90                         panic("uio_copyback: empty");
   91                 count = min(iov->iov_len - off, len);
   92                 bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
   93                 len -= count;
   94                 cp += count;
   95                 off = 0;
   96                 iol--;
   97                 iov++;
   98         }
   99 }
  100 
  101 int
  102 cuio_getptr(struct uio *uio, int loc, int *off)
  103 {
  104         int ind, len;
  105 
  106         ind = 0;
  107         while (loc >= 0 && ind < uio->uio_iovcnt) {
  108                 len = uio->uio_iov[ind].iov_len;
  109                 if (len > loc) {
  110                         *off = loc;
  111                         return (ind);
  112                 }
  113                 loc -= len;
  114                 ind++;
  115         }
  116 
  117         if (ind > 0 && loc == 0) {
  118                 ind--;
  119                 *off = uio->uio_iov[ind].iov_len;
  120                 return (ind);
  121         }
  122 
  123         return (-1);
  124 }
  125 
  126 int
  127 cuio_apply(struct uio *uio, int off, int len,
  128     int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate)
  129 {
  130         int rval, ind, uiolen;
  131         unsigned int count;
  132 
  133         if (len < 0)
  134                 panic("cuio_apply: len %d < 0", len);
  135         if (off < 0)
  136                 panic("cuio_apply: off %d < 0", off);
  137         
  138         ind = 0;
  139         while (off > 0) {
  140                 if (ind >= uio->uio_iovcnt)
  141                         panic("cuio_apply: ind %d >= uio_iovcnt %d for off",
  142                             ind, uio->uio_iovcnt);
  143                 uiolen = uio->uio_iov[ind].iov_len;
  144                 if (off < uiolen)
  145                         break;
  146                 off -= uiolen;
  147                 ind++;
  148         }
  149         while (len > 0) {
  150                 if (ind >= uio->uio_iovcnt)
  151                         panic("cuio_apply: ind %d >= uio_iovcnt %d for len",
  152                             ind, uio->uio_iovcnt);
  153                 count = min(uio->uio_iov[ind].iov_len - off, len);
  154 
  155                 rval = f(fstate, (char *)uio->uio_iov[ind].iov_base + off,
  156                     count);
  157                 if (rval)
  158                         return (rval);
  159 
  160                 len -= count;
  161                 off = 0;
  162                 ind++;
  163         }
  164 
  165         return (0);
  166 }

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

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sys/crypto/criov.c