/*
 * Copyright (c) 1997, 1999 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "krb5_locl.h"

RCSID("$Id: store_fd.c,v 1.6 1999/12/02 17:05:13 joda Exp $");

typedef struct fd_storage{
    int fd;
}fd_storage;

#define FD(S) (((fd_storage*)(S)->data)->fd)

static ssize_t
fd_fetch(krb5_storage *sp, void *data, size_t size)
{
    return read(FD(sp), data, size);
}

static ssize_t
fd_store(krb5_storage *sp, void *data, size_t size)
{
    return write(FD(sp), data, size);
}

static off_t
fd_seek(krb5_storage *sp, off_t offset, int whence)
{
    return lseek(FD(sp), offset, whence);
}

krb5_storage *
krb5_storage_from_fd(int fd)
{
    krb5_storage *sp = malloc(sizeof(krb5_storage));
    sp->data = malloc(sizeof(fd_storage));
    sp->flags = 0;
    FD(sp) = fd;
    sp->fetch = fd_fetch;
    sp->store = fd_store;
    sp->seek = fd_seek;
    sp->free = NULL;
    return sp;
}
