store_fd.c revision 102644 
1/*
2 * Copyright (c) 1997 - 2002 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#include "store-int.h"
36
37RCSID("$Id: store_fd.c,v 1.10 2002/04/18 14:00:39 joda Exp $");
38
39typedef struct fd_storage{
40    int fd;
41}fd_storage;
42
43#define FD(S) (((fd_storage*)(S)->data)->fd)
44
45static ssize_t
46fd_fetch(krb5_storage *sp, void *data, size_t size)
47{
48    return net_read(FD(sp), data, size);
49}
50
51static ssize_t
52fd_store(krb5_storage *sp, const void *data, size_t size)
53{
54    return net_write(FD(sp), data, size);
55}
56
57static off_t
58fd_seek(krb5_storage *sp, off_t offset, int whence)
59{
60    return lseek(FD(sp), offset, whence);
61}
62
63krb5_storage *
64krb5_storage_from_fd(int fd)
65{
66    krb5_storage *sp = malloc(sizeof(krb5_storage));
67
68    if (sp == NULL)
69	return NULL;
70
71    sp->data = malloc(sizeof(fd_storage));
72    if (sp->data == NULL) {
73	free(sp);
74	return NULL;
75    }
76    sp->flags = 0;
77    sp->eof_code = HEIM_ERR_EOF;
78    FD(sp) = fd;
79    sp->fetch = fd_fetch;
80    sp->store = fd_store;
81    sp->seek = fd_seek;
82    sp->free = NULL;
83    return sp;
84}
85