1/*
2 * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
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
38/*
39 * Like read but never return partial data.
40 */
41
42#ifndef _WIN32
43
44ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
45net_read (rk_socket_t fd, void *buf, size_t nbytes)
46{
47    char *cbuf = (char *)buf;
48    ssize_t count;
49    size_t rem = nbytes;
50
51    while (rem > 0) {
52	count = read (fd, cbuf, rem);
53	if (count < 0) {
54	    if (errno == EINTR)
55		continue;
56	    else
57		return count;
58	} else if (count == 0) {
59	    return count;
60	}
61	cbuf += count;
62	rem -= count;
63    }
64    return nbytes;
65}
66
67#else
68
69ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
70net_read(rk_socket_t sock, void *buf, size_t nbytes)
71{
72    char *cbuf = (char *)buf;
73    ssize_t count;
74    size_t rem = nbytes;
75
76#ifdef SOCKET_IS_NOT_AN_FD
77    int use_read = 0;
78#endif
79
80    while (rem > 0) {
81#ifdef SOCKET_IS_NOT_AN_FD
82	if (use_read)
83	    count = _read (sock, cbuf, rem);
84	else
85	    count = recv (sock, cbuf, rem, 0);
86
87	if (use_read == 0 &&
88	    rk_IS_SOCKET_ERROR(count) &&
89            (rk_SOCK_ERRNO == WSANOTINITIALISED ||
90             rk_SOCK_ERRNO == WSAENOTSOCK)) {
91	    use_read = 1;
92
93	    count = _read (sock, cbuf, rem);
94	}
95#else
96	count = recv (sock, cbuf, rem, 0);
97#endif
98	if (count < 0) {
99
100	    /* With WinSock, the error EINTR (WSAEINTR), is used to
101	       indicate that a blocking call was cancelled using
102	       WSACancelBlockingCall(). */
103
104#ifndef HAVE_WINSOCK
105	    if (rk_SOCK_ERRNO == EINTR)
106		continue;
107#endif
108	    return count;
109	} else if (count == 0) {
110	    return count;
111	}
112	cbuf += count;
113	rem -= count;
114    }
115    return nbytes;
116}
117
118#endif
119