readv.c revision 1.1.1.1 
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 H��gskolan
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
40ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
41readv(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}
67