sunrpc/xdr_stdio.c

   1 /* @(#)xdr_stdio.c      2.1 88/07/29 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if !defined(lint) && defined(SCCSIDS)
  31 static char sccsid[] = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * xdr_stdio.c, XDR implementation on standard i/o file.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  *
  39  * This set of routines implements a XDR on a stdio stream.
  40  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  41  * from the stream.
  42  */
  43
  44 #include <rpc/types.h>
  45 #include <stdio.h>
  46 #include <rpc/xdr.h>
  47
  48 static bool_t   xdrstdio_getlong();
  49 static bool_t   xdrstdio_putlong();
  50 static bool_t   xdrstdio_getbytes();
  51 static bool_t   xdrstdio_putbytes();
  52 static u_int    xdrstdio_getpos();
  53 static bool_t   xdrstdio_setpos();
  54 static long *   xdrstdio_inline();
  55 static void     xdrstdio_destroy();
  56
  57 /*
  58  * Ops vector for stdio type XDR
  59  */
  60 static struct xdr_ops   xdrstdio_ops = {
  61         xdrstdio_getlong,       /* deseraialize a long int */
  62         xdrstdio_putlong,       /* seraialize a long int */
  63         xdrstdio_getbytes,      /* deserialize counted bytes */
  64         xdrstdio_putbytes,      /* serialize counted bytes */
  65         xdrstdio_getpos,        /* get offset in the stream */
  66         xdrstdio_setpos,        /* set offset in the stream */
  67         xdrstdio_inline,        /* prime stream for inline macros */
  68         xdrstdio_destroy        /* destroy stream */
  69 };
  70
  71 /*
  72  * Initialize a stdio xdr stream.
  73  * Sets the xdr stream handle xdrs for use on the stream file.
  74  * Operation flag is set to op.
  75  */
  76 void
  77 xdrstdio_create(xdrs, file, op)
  78         register XDR *xdrs;
  79         FILE *file;
  80         enum xdr_op op;
  81 {
  82
  83         xdrs->x_op = op;
  84         xdrs->x_ops = &xdrstdio_ops;
  85         xdrs->x_private = (caddr_t)file;
  86         xdrs->x_handy = 0;
  87         xdrs->x_base = 0;
  88 }
  89
  90 /*
  91  * Destroy a stdio xdr stream.
  92  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
  93  */
  94 static void
  95 xdrstdio_destroy(xdrs)
  96         register XDR *xdrs;
  97 {
  98         (void)fflush((FILE *)xdrs->x_private);
  99         /* xx should we close the file ?? */
 100 };
 101
 102 static bool_t
 103 xdrstdio_getlong(xdrs, lp)
 104         XDR *xdrs;
 105         register long *lp;
 106 {
 107         int32_t mycopy;
 108
 109         if (fread((caddr_t)&mycopy, 4, 1, (FILE *)xdrs->x_private) != 1)
 110                 return (FALSE);
 111         *lp = (int32_t) ntohl(mycopy);
 112         return (TRUE);
 113 }
 114
 115 static bool_t
 116 xdrstdio_putlong(xdrs, lp)
 117         XDR *xdrs;
 118         long *lp;
 119 {
 120
 121         int32_t  mycopy = htonl(*(int32_t*)lp);
 122         lp = &mycopy;
 123         if (fwrite((caddr_t)lp, 4, 1, (FILE *)xdrs->x_private) != 1)
 124                 return (FALSE);
 125         return (TRUE);
 126 }
 127
 128 static bool_t
 129 xdrstdio_getbytes(xdrs, addr, len)
 130         XDR *xdrs;
 131         caddr_t addr;
 132         u_int len;
 133 {
 134
 135         if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
 136                 return (FALSE);
 137         return (TRUE);
 138 }
 139
 140 static bool_t
 141 xdrstdio_putbytes(xdrs, addr, len)
 142         XDR *xdrs;
 143         caddr_t addr;
 144         u_int len;
 145 {
 146
 147         if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
 148                 return (FALSE);
 149         return (TRUE);
 150 }
 151
 152 static u_int
 153 xdrstdio_getpos(xdrs)
 154         XDR *xdrs;
 155 {
 156
 157         return ((u_int) ftell((FILE *)xdrs->x_private));
 158 }
 159
 160 static bool_t
 161 xdrstdio_setpos(xdrs, pos)
 162         XDR *xdrs;
 163         u_int pos;
 164 {
 165
 166         return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
 167                 FALSE : TRUE);
 168 }
 169
 170 static long *
 171 xdrstdio_inline(xdrs, len)
 172         XDR *xdrs;
 173         u_int len;
 174 {
 175
 176         /*
 177          * Must do some work to implement this: must insure
 178          * enough data in the underlying stdio buffer,
 179          * that the buffer is aligned so that we can indirect through a
 180          * long *, and stuff this pointer in xdrs->x_buf.  Doing
 181          * a fread or fwrite to a scratch buffer would defeat
 182          * most of the gains to be had here and require storage
 183          * management on this buffer, so we don't do this.
 184          */
 185         return (NULL);
 186 }