rpc.subproj/xdr_stdio.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";*/
  55 /*static char *sccsid = "from: @(#)xdr_stdio.c  2.1 88/07/29 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: xdr_stdio.c,v 1.2 1999/10/14 21:56:55 wsanchez Exp $";
  57 #endif
  58
  59 /*
  60  * xdr_stdio.c, XDR implementation on standard i/o file.
  61  *
  62  * Copyright (C) 1984, Sun Microsystems, Inc.
  63  *
  64  * This set of routines implements a XDR on a stdio stream.
  65  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  66  * from the stream.
  67  */
  68
  69 #include <rpc/types.h>
  70 #include <stdio.h>
  71 #include <rpc/xdr.h>
  72
  73 static bool_t   xdrstdio_getlong();
  74 static bool_t   xdrstdio_putlong();
  75 static bool_t   xdrstdio_getbytes();
  76 static bool_t   xdrstdio_putbytes();
  77 static u_int    xdrstdio_getpos();
  78 static bool_t   xdrstdio_setpos();
  79 static long *   xdrstdio_inline();
  80 static void     xdrstdio_destroy();
  81
  82 /*
  83  * Ops vector for stdio type XDR
  84  */
  85 static struct xdr_ops   xdrstdio_ops = {
  86         xdrstdio_getlong,       /* deseraialize a long int */
  87         xdrstdio_putlong,       /* seraialize a long int */
  88         xdrstdio_getbytes,      /* deserialize counted bytes */
  89         xdrstdio_putbytes,      /* serialize counted bytes */
  90         xdrstdio_getpos,        /* get offset in the stream */
  91         xdrstdio_setpos,        /* set offset in the stream */
  92         xdrstdio_inline,        /* prime stream for inline macros */
  93         xdrstdio_destroy        /* destroy stream */
  94 };
  95
  96 /*
  97  * Initialize a stdio xdr stream.
  98  * Sets the xdr stream handle xdrs for use on the stream file.
  99  * Operation flag is set to op.
 100  */
 101 void
 102 xdrstdio_create(xdrs, file, op)
 103         register XDR *xdrs;
 104         FILE *file;
 105         enum xdr_op op;
 106 {
 107
 108         xdrs->x_op = op;
 109         xdrs->x_ops = &xdrstdio_ops;
 110         xdrs->x_private = (caddr_t)file;
 111         xdrs->x_handy = 0;
 112         xdrs->x_base = 0;
 113 }
 114
 115 /*
 116  * Destroy a stdio xdr stream.
 117  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 118  */
 119 static void
 120 xdrstdio_destroy(xdrs)
 121         register XDR *xdrs;
 122 {
 123         (void)fflush((FILE *)xdrs->x_private);
 124         /* xx should we close the file ?? */
 125 };
 126
 127 static bool_t
 128 xdrstdio_getlong(xdrs, lp)
 129         XDR *xdrs;
 130         register long *lp;
 131 {
 132
 133         if (fread((caddr_t)lp, sizeof(long), 1, (FILE *)xdrs->x_private) != 1)
 134                 return (FALSE);
 135 #ifndef mc68000
 136         *lp = ntohl(*lp);
 137 #endif
 138         return (TRUE);
 139 }
 140
 141 static bool_t
 142 xdrstdio_putlong(xdrs, lp)
 143         XDR *xdrs;
 144         long *lp;
 145 {
 146
 147 #ifndef mc68000
 148         long mycopy = htonl(*lp);
 149         lp = &mycopy;
 150 #endif
 151         if (fwrite((caddr_t)lp, sizeof(long), 1, (FILE *)xdrs->x_private) != 1)
 152                 return (FALSE);
 153         return (TRUE);
 154 }
 155
 156 static bool_t
 157 xdrstdio_getbytes(xdrs, addr, len)
 158         XDR *xdrs;
 159         caddr_t addr;
 160         u_int len;
 161 {
 162
 163         if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
 164                 return (FALSE);
 165         return (TRUE);
 166 }
 167
 168 static bool_t
 169 xdrstdio_putbytes(xdrs, addr, len)
 170         XDR *xdrs;
 171         caddr_t addr;
 172         u_int len;
 173 {
 174
 175         if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
 176                 return (FALSE);
 177         return (TRUE);
 178 }
 179
 180 static u_int
 181 xdrstdio_getpos(xdrs)
 182         XDR *xdrs;
 183 {
 184
 185         return ((u_int) ftell((FILE *)xdrs->x_private));
 186 }
 187
 188 static bool_t
 189 xdrstdio_setpos(xdrs, pos)
 190         XDR *xdrs;
 191         u_int pos;
 192 {
 193
 194         return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
 195                 FALSE : TRUE);
 196 }
 197
 198 static long *
 199 xdrstdio_inline(xdrs, len)
 200         XDR *xdrs;
 201         u_int len;
 202 {
 203
 204         /*
 205          * Must do some work to implement this: must insure
 206          * enough data in the underlying stdio buffer,
 207          * that the buffer is aligned so that we can indirect through a
 208          * long *, and stuff this pointer in xdrs->x_buf.  Doing
 209          * a fread or fwrite to a scratch buffer would defeat
 210          * most of the gains to be had here and require storage
 211          * management on this buffer, so we don't do this.
 212          */
 213         return (NULL);
 214 }