lib/krb5/store_fd.c

   1 /*
   2  * Copyright (c) 1997 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. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Kungliga Tekniska
  20  *      Högskolan and its contributors.
  21  *
  22  * 4. Neither the name of the Institute nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include "krb5_locl.h"
  40
  41 RCSID("$Id$");
  42
  43 typedef struct fd_storage{
  44     int fd;
  45 }fd_storage;
  46
  47 #define FD(S) (((fd_storage*)(S)->data)->fd)
  48
  49 static size_t
  50 fd_fetch(krb5_storage *sp, void *data, size_t size)
  51 {
  52     return read(FD(sp), data, size);
  53 }
  54
  55 static size_t
  56 fd_store(krb5_storage *sp, void *data, size_t size)
  57 {
  58     return write(FD(sp), data, size);
  59 }
  60
  61 static off_t
  62 fd_seek(krb5_storage *sp, off_t offset, int whence)
  63 {
  64     return lseek(FD(sp), offset, whence);
  65 }
  66
  67 krb5_storage *
  68 krb5_storage_from_fd(int fd)
  69 {
  70     krb5_storage *sp = malloc(sizeof(krb5_storage));
  71     sp->data = malloc(sizeof(fd_storage));
  72     FD(sp) = fd;
  73     sp->fetch = fd_fetch;
  74     sp->store = fd_store;
  75     sp->seek = fd_seek;
  76     sp->free = NULL;
  77     return sp;
  78 }