lib/libc/rpc/xdr_stdio.c

   1 /*      $NetBSD: xdr_stdio.c,v 1.17 2006/10/15 16:14:46 christos Exp $  */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char *sccsid = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
  36 static char *sccsid = "@(#)xdr_stdio.c  2.1 88/07/29 4.0 RPCSRC";
  37 #else
  38 __RCSID("$NetBSD: xdr_stdio.c,v 1.17 2006/10/15 16:14:46 christos Exp $");
  39 #endif
  40 #endif
  41
  42 /*
  43  * xdr_stdio.c, XDR implementation on standard i/o file.
  44  *
  45  * Copyright (C) 1984, Sun Microsystems, Inc.
  46  *
  47  * This set of routines implements a XDR on a stdio stream.
  48  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  49  * from the stream.
  50  */
  51
  52 #include "namespace.h"
  53
  54 #include <stdio.h>
  55
  56 #include <rpc/types.h>
  57 #include <rpc/xdr.h>
  58
  59 #ifdef __weak_alias
  60 __weak_alias(xdrstdio_create,_xdrstdio_create)
  61 #endif
  62
  63 static void xdrstdio_destroy __P((XDR *));
  64 static bool_t xdrstdio_getlong __P((XDR *, long *));
  65 static bool_t xdrstdio_putlong __P((XDR *, const long *));
  66 static bool_t xdrstdio_getbytes __P((XDR *, char *, u_int));
  67 static bool_t xdrstdio_putbytes __P((XDR *, const char *, u_int));
  68 static u_int xdrstdio_getpos __P((XDR *));
  69 static bool_t xdrstdio_setpos __P((XDR *, u_int));
  70 static int32_t *xdrstdio_inline __P((XDR *, u_int));
  71
  72 /*
  73  * Ops vector for stdio type XDR
  74  */
  75 static const struct xdr_ops     xdrstdio_ops = {
  76         xdrstdio_getlong,       /* deseraialize a long int */
  77         xdrstdio_putlong,       /* seraialize a long int */
  78         xdrstdio_getbytes,      /* deserialize counted bytes */
  79         xdrstdio_putbytes,      /* serialize counted bytes */
  80         xdrstdio_getpos,        /* get offset in the stream */
  81         xdrstdio_setpos,        /* set offset in the stream */
  82         xdrstdio_inline,        /* prime stream for inline macros */
  83         xdrstdio_destroy,       /* destroy stream */
  84         NULL,                   /* xdrstdio_control */
  85 };
  86
  87 /*
  88  * Initialize a stdio xdr stream.
  89  * Sets the xdr stream handle xdrs for use on the stream file.
  90  * Operation flag is set to op.
  91  */
  92 void
  93 xdrstdio_create(xdrs, file, op)
  94         XDR *xdrs;
  95         FILE *file;
  96         enum xdr_op op;
  97 {
  98
  99         xdrs->x_op = op;
 100         xdrs->x_ops = &xdrstdio_ops;
 101         xdrs->x_private = file;
 102         xdrs->x_handy = 0;
 103         xdrs->x_base = 0;
 104 }
 105
 106 /*
 107  * Destroy a stdio xdr stream.
 108  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 109  */
 110 static void
 111 xdrstdio_destroy(xdrs)
 112         XDR *xdrs;
 113 {
 114         (void)fflush((FILE *)xdrs->x_private);
 115                 /* XXX: should we close the file ?? */
 116 }
 117
 118 static bool_t
 119 xdrstdio_getlong(xdrs, lp)
 120         XDR *xdrs;
 121         long *lp;
 122 {
 123         u_int32_t temp;
 124
 125         if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 126                 return (FALSE);
 127         *lp = (long)ntohl(temp);
 128         return (TRUE);
 129 }
 130
 131 static bool_t
 132 xdrstdio_putlong(xdrs, lp)
 133         XDR *xdrs;
 134         const long *lp;
 135 {
 136         int32_t mycopy = htonl((u_int32_t)*lp);
 137
 138         if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 139                 return (FALSE);
 140         return (TRUE);
 141 }
 142
 143 static bool_t
 144 xdrstdio_getbytes(xdrs, addr, len)
 145         XDR *xdrs;
 146         char *addr;
 147         u_int len;
 148 {
 149
 150         if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
 151                 return (FALSE);
 152         return (TRUE);
 153 }
 154
 155 static bool_t
 156 xdrstdio_putbytes(xdrs, addr, len)
 157         XDR *xdrs;
 158         const char *addr;
 159         u_int len;
 160 {
 161
 162         if ((len != 0) && (fwrite(addr, (size_t)len, 1,
 163             (FILE *)xdrs->x_private) != 1))
 164                 return (FALSE);
 165         return (TRUE);
 166 }
 167
 168 static u_int
 169 xdrstdio_getpos(xdrs)
 170         XDR *xdrs;
 171 {
 172
 173         return ((u_int) ftell((FILE *)xdrs->x_private));
 174 }
 175
 176 static bool_t
 177 xdrstdio_setpos(xdrs, pos)
 178         XDR *xdrs;
 179         u_int pos;
 180 {
 181
 182         return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
 183                 FALSE : TRUE);
 184 }
 185
 186 /* ARGSUSED */
 187 static int32_t *
 188 xdrstdio_inline(xdrs, len)
 189         XDR *xdrs;
 190         u_int len;
 191 {
 192
 193         /*
 194          * Must do some work to implement this: must insure
 195          * enough data in the underlying stdio buffer,
 196          * that the buffer is aligned so that we can indirect through a
 197          * long *, and stuff this pointer in xdrs->x_buf.  Doing
 198          * a fread or fwrite to a scratch buffer would defeat
 199          * most of the gains to be had here and require storage
 200          * management on this buffer, so we don't do this.
 201          */
 202         return (NULL);
 203 }