/crypto/heimdal/lib/roken/recvmsg.c

 1/*
 2 * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Hรถgskolan
 3 * (Royal Institute of Technology, Stockholm, Sweden).
 4 * All rights reserved.
 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 *
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 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <config.h>
35
36#include "roken.h"
37
38ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
39recvmsg(int s, struct msghdr *msg, int flags)
40{
41    ssize_t ret, nb;
42    size_t tot = 0;
43    int i;
44    char *buf, *p;
45    struct iovec *iov = msg->msg_iov;
46
47    for(i = 0; i < msg->msg_iovlen; ++i)
48	tot += iov[i].iov_len;
49    buf = malloc(tot);
50    if (tot != 0 && buf == NULL) {
51	errno = ENOMEM;
52	return -1;
53    }
54    nb = ret = recvfrom (s, buf, tot, flags, msg->msg_name, &msg->msg_namelen);
55    p = buf;
56    while (nb > 0) {
57	ssize_t cnt = min(nb, iov->iov_len);
58
59	memcpy (iov->iov_base, p, cnt);
60	p += cnt;
61	nb -= cnt;
62	++iov;
63    }
64    free(buf);
65    return ret;
66}