crypto/external/bsd/heimdal/dist/lib/roken/readv.c

   1 /*      $NetBSD: readv.c,v 1.1.1.1 2011/04/13 18:15:42 elric Exp $      */
   2
   3 /*
   4  * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <config.h>
  37
  38 #include <krb5/roken.h>
  39
  40 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
  41 readv(int d, const struct iovec *iov, int iovcnt)
  42 {
  43     ssize_t ret, nb;
  44     size_t tot = 0;
  45     int i;
  46     char *buf, *p;
  47
  48     for(i = 0; i < iovcnt; ++i)
  49         tot += iov[i].iov_len;
  50     buf = malloc(tot);
  51     if (tot != 0 && buf == NULL) {
  52         errno = ENOMEM;
  53         return -1;
  54     }
  55     nb = ret = read (d, buf, tot);
  56     p = buf;
  57     while (nb > 0) {
  58         ssize_t cnt = min(nb, iov->iov_len);
  59
  60         memcpy (iov->iov_base, p, cnt);
  61         p += cnt;
  62         nb -= cnt;
  63     }
  64     free(buf);
  65     return ret;
  66 }