lib/libc/rpc/xdr_stdio.c

   1 /*      $NetBSD: xdr_stdio.c,v 1.19 2013/03/11 20:19:30 tron Exp $      */
   2
   3 /*
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 #if 0
  37 static char *sccsid = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
  38 static char *sccsid = "@(#)xdr_stdio.c  2.1 88/07/29 4.0 RPCSRC";
  39 #else
  40 __RCSID("$NetBSD: xdr_stdio.c,v 1.19 2013/03/11 20:19:30 tron Exp $");
  41 #endif
  42 #endif
  43
  44 /*
  45  * xdr_stdio.c, XDR implementation on standard i/o file.
  46  *
  47  * Copyright (C) 1984, Sun Microsystems, Inc.
  48  *
  49  * This set of routines implements a XDR on a stdio stream.
  50  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  51  * from the stream.
  52  */
  53
  54 #include "namespace.h"
  55
  56 #include <stdio.h>
  57
  58 #include <rpc/types.h>
  59 #include <rpc/xdr.h>
  60
  61 #ifdef __weak_alias
  62 __weak_alias(xdrstdio_create,_xdrstdio_create)
  63 #endif
  64
  65 static void xdrstdio_destroy(XDR *);
  66 static bool_t xdrstdio_getlong(XDR *, long *);
  67 static bool_t xdrstdio_putlong(XDR *, const long *);
  68 static bool_t xdrstdio_getbytes(XDR *, char *, u_int);
  69 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int);
  70 static u_int xdrstdio_getpos(XDR *);
  71 static bool_t xdrstdio_setpos(XDR *, u_int);
  72 static int32_t *xdrstdio_inline(XDR *, u_int);
  73
  74 /*
  75  * Ops vector for stdio type XDR
  76  */
  77 static const struct xdr_ops     xdrstdio_ops = {
  78         xdrstdio_getlong,       /* deseraialize a long int */
  79         xdrstdio_putlong,       /* seraialize a long int */
  80         xdrstdio_getbytes,      /* deserialize counted bytes */
  81         xdrstdio_putbytes,      /* serialize counted bytes */
  82         xdrstdio_getpos,        /* get offset in the stream */
  83         xdrstdio_setpos,        /* set offset in the stream */
  84         xdrstdio_inline,        /* prime stream for inline macros */
  85         xdrstdio_destroy,       /* destroy stream */
  86         NULL,                   /* xdrstdio_control */
  87 };
  88
  89 /*
  90  * Initialize a stdio xdr stream.
  91  * Sets the xdr stream handle xdrs for use on the stream file.
  92  * Operation flag is set to op.
  93  */
  94 void
  95 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op)
  96 {
  97
  98         xdrs->x_op = op;
  99         xdrs->x_ops = &xdrstdio_ops;
 100         xdrs->x_private = file;
 101         xdrs->x_handy = 0;
 102         xdrs->x_base = 0;
 103 }
 104
 105 /*
 106  * Destroy a stdio xdr stream.
 107  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 108  */
 109 static void
 110 xdrstdio_destroy(XDR *xdrs)
 111 {
 112         (void)fflush((FILE *)xdrs->x_private);
 113                 /* XXX: should we close the file ?? */
 114 }
 115
 116 static bool_t
 117 xdrstdio_getlong(XDR *xdrs, long *lp)
 118 {
 119         u_int32_t temp;
 120
 121         if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 122                 return (FALSE);
 123         *lp = (long)ntohl(temp);
 124         return (TRUE);
 125 }
 126
 127 static bool_t
 128 xdrstdio_putlong(XDR *xdrs, const long *lp)
 129 {
 130         int32_t mycopy = htonl((u_int32_t)*lp);
 131
 132         if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 133                 return (FALSE);
 134         return (TRUE);
 135 }
 136
 137 static bool_t
 138 xdrstdio_getbytes(XDR *xdrs, char *addr, u_int len)
 139 {
 140
 141         if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
 142                 return (FALSE);
 143         return (TRUE);
 144 }
 145
 146 static bool_t
 147 xdrstdio_putbytes(XDR *xdrs, const char *addr, u_int len)
 148 {
 149
 150         if ((len != 0) && (fwrite(addr, (size_t)len, 1,
 151             (FILE *)xdrs->x_private) != 1))
 152                 return (FALSE);
 153         return (TRUE);
 154 }
 155
 156 static u_int
 157 xdrstdio_getpos(XDR *xdrs)
 158 {
 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
 167         return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
 168                 FALSE : TRUE);
 169 }
 170
 171 /* ARGSUSED */
 172 static int32_t *
 173 xdrstdio_inline(XDR *xdrs, 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 }