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 #ifdef USE_IN_LIBIO
  49 # include <libio/iolibio.h>
  50 # define fflush(s) _IO_fflush (s)
  51 # define fread(p, m, n, s) _IO_fread (p, m, n, s)
  52 # define ftell(s) _IO_ftell (s)
  53 # define fwrite(p, m, n, s) _IO_fwrite (p, m, n, s)
  54 #endif
  55
  56 static bool_t xdrstdio_getlong (XDR *, long *);
  57 static bool_t xdrstdio_putlong (XDR *, const long *);
  58 static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int);
  59 static bool_t xdrstdio_putbytes (XDR *, const char *, u_int);
  60 static u_int xdrstdio_getpos (const XDR *);
  61 static bool_t xdrstdio_setpos (XDR *, u_int);
  62 static long *xdrstdio_inline (XDR *, int);
  63 static void xdrstdio_destroy (XDR *);
  64
  65 /*
  66  * Ops vector for stdio type XDR
  67  */
  68 static const struct xdr_ops xdrstdio_ops =
  69 {
  70   xdrstdio_getlong,             /* deserialize a long int */
  71   xdrstdio_putlong,             /* serialize a long int */
  72   xdrstdio_getbytes,            /* deserialize counted bytes */
  73   xdrstdio_putbytes,            /* serialize counted bytes */
  74   xdrstdio_getpos,              /* get offset in the stream */
  75   xdrstdio_setpos,              /* set offset in the stream */
  76   xdrstdio_inline,              /* prime stream for inline macros */
  77   xdrstdio_destroy              /* destroy stream */
  78 };
  79
  80 /*
  81  * Initialize a stdio xdr stream.
  82  * Sets the xdr stream handle xdrs for use on the stream file.
  83  * Operation flag is set to op.
  84  */
  85 void
  86 xdrstdio_create (xdrs, file, op)
  87      XDR *xdrs;
  88      FILE *file;
  89      enum xdr_op op;
  90 {
  91
  92   xdrs->x_op = op;
  93   /* We have to add the const since the `struct xdr_ops' in `struct XDR'
  94      is not `const'.  */
  95   xdrs->x_ops = (struct xdr_ops *) &xdrstdio_ops;
  96   xdrs->x_private = (caddr_t) file;
  97   xdrs->x_handy = 0;
  98   xdrs->x_base = 0;
  99 }
 100
 101 /*
 102  * Destroy a stdio xdr stream.
 103  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 104  */
 105 static void
 106 xdrstdio_destroy (xdrs)
 107      XDR *xdrs;
 108 {
 109   (void) fflush ((FILE *) xdrs->x_private);
 110   /* xx should we close the file ?? */
 111 };
 112
 113 static bool_t
 114 xdrstdio_getlong (xdrs, lp)
 115      XDR *xdrs;
 116      long *lp;
 117 {
 118   int32_t mycopy;
 119
 120   if (fread ((caddr_t) & mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 121     return FALSE;
 122   *lp = (int32_t) ntohl (mycopy);
 123   return TRUE;
 124 }
 125
 126 static bool_t
 127 xdrstdio_putlong (XDR *xdrs, const long *lp)
 128 {
 129
 130   long mycopy = htonl (*lp);
 131   lp = &mycopy;
 132   if (fwrite ((caddr_t) lp, 4, 1, (FILE *) xdrs->x_private) != 1)
 133     return FALSE;
 134   return TRUE;
 135 }
 136
 137 static bool_t
 138 xdrstdio_getbytes (xdrs, addr, len)
 139      XDR *xdrs;
 140      const caddr_t addr;
 141      u_int len;
 142 {
 143
 144   if ((len != 0) && (fread (addr, (int) len, 1, (FILE *) xdrs->x_private) != 1))
 145     return FALSE;
 146   return TRUE;
 147 }
 148
 149 static bool_t
 150 xdrstdio_putbytes (XDR *xdrs, const char *addr, u_int len)
 151 {
 152   if ((len != 0) && (fwrite (addr, (int) len, 1, (FILE *) xdrs->x_private) != 1))
 153     return FALSE;
 154   return TRUE;
 155 }
 156
 157 static u_int
 158 xdrstdio_getpos (const XDR *xdrs)
 159 {
 160   return (u_int) ftell ((FILE *) xdrs->x_private);
 161 }
 162
 163 static bool_t
 164 xdrstdio_setpos (XDR *xdrs, u_int pos)
 165 {
 166   return fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0 ? FALSE : TRUE;
 167 }
 168
 169 static long *
 170 xdrstdio_inline (XDR *xdrs, int len)
 171 {
 172
 173   /*
 174    * Must do some work to implement this: must insure
 175    * enough data in the underlying stdio buffer,
 176    * that the buffer is aligned so that we can indirect through a
 177    * long *, and stuff this pointer in xdrs->x_buf.  Doing
 178    * a fread or fwrite to a scratch buffer would defeat
 179    * most of the gains to be had here and require storage
 180    * management on this buffer, so we don't do this.
 181    */
 182   return NULL;
 183 }