store_fd.c revision 90926 
1/*
2 * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan
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 "krb5_locl.h"
35
36RCSID("$Id: store_fd.c,v 1.9 2001/06/24 05:39:51 assar Exp $");
37
38typedef struct fd_storage{
39    int fd;
40}fd_storage;
41
42#define FD(S) (((fd_storage*)(S)->data)->fd)
43
44static ssize_t
45fd_fetch(krb5_storage *sp, void *data, size_t size)
46{
47    return net_read(FD(sp), data, size);
48}
49
50static ssize_t
51fd_store(krb5_storage *sp, const void *data, size_t size)
52{
53    return net_write(FD(sp), data, size);
54}
55
56static off_t
57fd_seek(krb5_storage *sp, off_t offset, int whence)
58{
59    return lseek(FD(sp), offset, whence);
60}
61
62krb5_storage *
63krb5_storage_from_fd(int fd)
64{
65    krb5_storage *sp = malloc(sizeof(krb5_storage));
66
67    if (sp == NULL)
68	return NULL;
69
70    sp->data = malloc(sizeof(fd_storage));
71    if (sp->data == NULL) {
72	free(sp);
73	return NULL;
74    }
75    sp->flags = 0;
76    FD(sp) = fd;
77    sp->fetch = fd_fetch;
78    sp->store = fd_store;
79    sp->seek = fd_seek;
80    sp->free = NULL;
81    return sp;
82}
83