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