lib/libc/xdr/xdr_stdio.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  * @(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro
  30  * @(#)xdr_stdio.c      2.1 88/07/29 4.0 RPCSRC
  31  * $FreeBSD: src/lib/libc/xdr/xdr_stdio.c,v 1.7 1999/08/28 00:02:56 peter Exp $
  32  * $DragonFly: src/lib/libc/xdr/xdr_stdio.c,v 1.4 2005/12/05 00:47:57 swildner Exp $
  33  */
  34
  35 /*
  36  * xdr_stdio.c, XDR implementation on standard i/o file.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  *
  40  * This set of routines implements a XDR on a stdio stream.
  41  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  42  * from the stream.
  43  */
  44
  45 #include <arpa/inet.h>
  46 #include <rpc/types.h>
  47 #include <stdio.h>
  48 #include <rpc/xdr.h>
  49
  50 static bool_t   xdrstdio_getlong(XDR *, long *);
  51 static bool_t   xdrstdio_putlong(XDR *, long *);
  52 static bool_t   xdrstdio_getbytes(XDR *, caddr_t, u_int);
  53 static bool_t   xdrstdio_putbytes(XDR *, caddr_t, u_int);
  54 static u_int    xdrstdio_getpos(XDR *);
  55 static bool_t   xdrstdio_setpos(XDR *, u_int);
  56 static int32_t *xdrstdio_inline(XDR *, u_int);
  57 static void     xdrstdio_destroy(XDR *);
  58
  59 /*
  60  * Ops vector for stdio type XDR
  61  */
  62 static struct xdr_ops   xdrstdio_ops = {
  63         xdrstdio_getlong,       /* deseraialize a long int */
  64         xdrstdio_putlong,       /* seraialize a long int */
  65         xdrstdio_getbytes,      /* deserialize counted bytes */
  66         xdrstdio_putbytes,      /* serialize counted bytes */
  67         xdrstdio_getpos,        /* get offset in the stream */
  68         xdrstdio_setpos,        /* set offset in the stream */
  69         xdrstdio_inline,        /* prime stream for inline macros */
  70         xdrstdio_destroy        /* destroy stream */
  71 };
  72
  73 /*
  74  * Initialize a stdio xdr stream.
  75  * Sets the xdr stream handle xdrs for use on the stream file.
  76  * Operation flag is set to op.
  77  */
  78 void
  79 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op)
  80 {
  81
  82         xdrs->x_op = op;
  83         xdrs->x_ops = &xdrstdio_ops;
  84         xdrs->x_private = (caddr_t)file;
  85         xdrs->x_handy = 0;
  86         xdrs->x_base = 0;
  87 }
  88
  89 /*
  90  * Destroy a stdio xdr stream.
  91  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
  92  */
  93 static void
  94 xdrstdio_destroy(XDR *xdrs)
  95 {
  96         fflush((FILE *)xdrs->x_private);
  97         /* xx should we close the file ?? */
  98 }
  99
 100 static bool_t
 101 xdrstdio_getlong(XDR *xdrs, long *lp)
 102 {
 103
 104         if (fread((caddr_t)lp, sizeof(int32_t), 1,
 105                 (FILE *)xdrs->x_private) != 1)
 106                 return (FALSE);
 107         *lp = (long)ntohl((int32_t)*lp);
 108         return (TRUE);
 109 }
 110
 111 static bool_t
 112 xdrstdio_putlong(XDR *xdrs, long *lp)
 113 {
 114
 115         long mycopy = (long)htonl((int32_t)*lp);
 116
 117         if (fwrite((caddr_t)&mycopy, sizeof(int32_t), 1,
 118                 (FILE *)xdrs->x_private) != 1)
 119                 return (FALSE);
 120         return (TRUE);
 121 }
 122
 123 static bool_t
 124 xdrstdio_getbytes(XDR *xdrs, caddr_t addr, u_int len)
 125 {
 126
 127         if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
 128                 return (FALSE);
 129         return (TRUE);
 130 }
 131
 132 static bool_t
 133 xdrstdio_putbytes(XDR *xdrs, caddr_t addr, u_int len)
 134 {
 135
 136         if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
 137                 return (FALSE);
 138         return (TRUE);
 139 }
 140
 141 static u_int
 142 xdrstdio_getpos(XDR *xdrs)
 143 {
 144         return ((u_int) ftell((FILE *)xdrs->x_private));
 145 }
 146
 147 static bool_t
 148 xdrstdio_setpos(XDR *xdrs, u_int pos)
 149 {
 150
 151         return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
 152                 FALSE : TRUE);
 153 }
 154
 155 static int32_t *
 156 xdrstdio_inline(XDR *xdrs __unused, u_int len __unused)
 157 {
 158
 159         /*
 160          * Must do some work to implement this: must insure
 161          * enough data in the underlying stdio buffer,
 162          * that the buffer is aligned so that we can indirect through a
 163          * long *, and stuff this pointer in xdrs->x_buf.  Doing
 164          * a fread or fwrite to a scratch buffer would defeat
 165          * most of the gains to be had here and require storage
 166          * management on this buffer, so we don't do this.
 167          */
 168         return (NULL);
 169 }