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  * $NetBSD: xdr_stdio.c,v 1.14 2000/01/22 22:19:19 mycroft Exp $
  32  * $FreeBSD: src/lib/libc/xdr/xdr_stdio.c,v 1.13 2004/10/16 06:32:43 obrien Exp $
  33  * $DragonFly: src/lib/libc/xdr/xdr_stdio.c,v 1.4 2005/12/05 00:47:57 swildner Exp $
  34  */
  35
  36 /*
  37  * xdr_stdio.c, XDR implementation on standard i/o file.
  38  *
  39  * Copyright (C) 1984, Sun Microsystems, Inc.
  40  *
  41  * This set of routines implements a XDR on a stdio stream.
  42  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  43  * from the stream.
  44  */
  45
  46 #include "namespace.h"
  47 #include <stdio.h>
  48
  49 #include <arpa/inet.h>
  50 #include <rpc/types.h>
  51 #include <rpc/xdr.h>
  52 #include "un-namespace.h"
  53
  54 static void     xdrstdio_destroy(XDR *);
  55 static bool_t   xdrstdio_getlong(XDR *, long *);
  56 static bool_t   xdrstdio_putlong(XDR *, const long *);
  57 static bool_t   xdrstdio_getbytes(XDR *, char *, u_int);
  58 static bool_t   xdrstdio_putbytes(XDR *, const char *, u_int);
  59 static u_int    xdrstdio_getpos(XDR *);
  60 static bool_t   xdrstdio_setpos(XDR *, u_int);
  61 static int32_t *xdrstdio_inline(XDR *, u_int);
  62
  63 /*
  64  * Ops vector for stdio type XDR
  65  */
  66 static const struct xdr_ops     xdrstdio_ops = {
  67         xdrstdio_getlong,       /* deseraialize a long int */
  68         xdrstdio_putlong,       /* seraialize a long int */
  69         xdrstdio_getbytes,      /* deserialize counted bytes */
  70         xdrstdio_putbytes,      /* serialize counted bytes */
  71         xdrstdio_getpos,        /* get offset in the stream */
  72         xdrstdio_setpos,        /* set offset in the stream */
  73         xdrstdio_inline,        /* prime stream for inline macros */
  74         xdrstdio_destroy        /* destroy stream */
  75 };
  76
  77 /*
  78  * Initialize a stdio xdr stream.
  79  * Sets the xdr stream handle xdrs for use on the stream file.
  80  * Operation flag is set to op.
  81  */
  82 void
  83 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op)
  84 {
  85
  86         xdrs->x_op = op;
  87         xdrs->x_ops = &xdrstdio_ops;
  88         xdrs->x_private = file;
  89         xdrs->x_handy = 0;
  90         xdrs->x_base = 0;
  91 }
  92
  93 /*
  94  * Destroy a stdio xdr stream.
  95  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
  96  */
  97 static void
  98 xdrstdio_destroy(XDR *xdrs)
  99 {
 100         fflush((FILE *)xdrs->x_private);
 101                 /* XXX: should we close the file ?? */
 102 }
 103
 104 static bool_t
 105 xdrstdio_getlong(XDR *xdrs, long *lp)
 106 {
 107         u_int32_t temp;
 108
 109         if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 110                 return (FALSE);
 111         *lp = (long)ntohl(temp);
 112         return (TRUE);
 113 }
 114
 115 static bool_t
 116 xdrstdio_putlong(XDR *xdrs, const long *lp)
 117 {
 118         int32_t mycopy = htonl((u_int32_t)*lp);
 119
 120         if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 121                 return (FALSE);
 122         return (TRUE);
 123 }
 124
 125 static bool_t
 126 xdrstdio_getbytes(XDR *xdrs, char *addr, u_int len)
 127 {
 128
 129         if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
 130                 return (FALSE);
 131         return (TRUE);
 132 }
 133
 134 static bool_t
 135 xdrstdio_putbytes(XDR *xdrs, const char *addr, u_int len)
 136 {
 137
 138         if ((len != 0) && (fwrite(addr, (size_t)len, 1,
 139             (FILE *)xdrs->x_private) != 1))
 140                 return (FALSE);
 141         return (TRUE);
 142 }
 143
 144 static u_int
 145 xdrstdio_getpos(XDR *xdrs)
 146 {
 147
 148         return ((u_int) ftell((FILE *)xdrs->x_private));
 149 }
 150
 151 static bool_t
 152 xdrstdio_setpos(XDR *xdrs, u_int pos)
 153 {
 154
 155         return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
 156                 FALSE : TRUE);
 157 }
 158
 159 /* ARGSUSED */
 160 static int32_t *
 161 xdrstdio_inline(XDR *xdrs __unused, u_int len __unused)
 162 {
 163
 164         /*
 165          * Must do some work to implement this: must insure
 166          * enough data in the underlying stdio buffer,
 167          * that the buffer is aligned so that we can indirect through a
 168          * long *, and stuff this pointer in xdrs->x_buf.  Doing
 169          * a fread or fwrite to a scratch buffer would defeat
 170          * most of the gains to be had here and require storage
 171          * management on this buffer, so we don't do this.
 172          */
 173         return (NULL);
 174 }