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/projects/cubeos/src_current/net/rpc/xdr_stdio.c

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/* @(#)xdr_stdio.c      2.1 88/07/29 4.0 RPCSRC */
/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 * 
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 * 
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 * 
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * xdr_stdio.c, XDR implementation on standard i/o file.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * This set of routines implements a XDR on a stdio stream.
 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
 * from the stream.
 */

#include <rpc/types.h>
#include <stdio.h>
#include <rpc/xdr.h>

static bool_t xdrstdio_getlong ();
static bool_t xdrstdio_putlong ();
static bool_t xdrstdio_getbytes ();
static bool_t xdrstdio_putbytes ();
static u_int xdrstdio_getpos ();
static bool_t xdrstdio_setpos ();
static long *xdrstdio_inline ();
static void xdrstdio_destroy ();

/*
 * Ops vector for stdio type XDR
 */
static struct xdr_ops xdrstdio_ops =
{
        xdrstdio_getlong,       /* deseraialize a long int */
        xdrstdio_putlong,       /* seraialize a long int */
        xdrstdio_getbytes,      /* deserialize counted bytes */
        xdrstdio_putbytes,      /* serialize counted bytes */
        xdrstdio_getpos,        /* get offset in the stream */
        xdrstdio_setpos,        /* set offset in the stream */
        xdrstdio_inline,        /* prime stream for inline macros */
        xdrstdio_destroy        /* destroy stream */
};

/*
 * Initialize a stdio xdr stream.
 * Sets the xdr stream handle xdrs for use on the stream file.
 * Operation flag is set to op.
 */
void xdrstdio_create (xdrs, file, op)
     register XDR *xdrs;
     FILE *file;
     enum xdr_op op;
{

        xdrs->x_op = op;
        xdrs->x_ops = &xdrstdio_ops;
        xdrs->x_private = (caddr_t) file;
        xdrs->x_handy = 0;
        xdrs->x_base = 0;
}

/*
 * Destroy a stdio xdr stream.
 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 */
static void xdrstdio_destroy (xdrs)
     register XDR *xdrs;
{
        (void) fflush ((FILE *) xdrs->x_private);
        /* xx should we close the file ?? */
};

static bool_t
  xdrstdio_getlong (xdrs, lp)
     XDR *xdrs;
     register long *lp;
{

        if (fread ((caddr_t) lp, sizeof (long), 1, (FILE *) xdrs->x_private) != 1)
                  return (FALSE);
#ifndef mc68000
        *lp = ntohl (*lp);
#endif
        return (TRUE);
}

static bool_t
  xdrstdio_putlong (xdrs, lp)
     XDR *xdrs;
     long *lp;
{

#ifndef mc68000
        long mycopy = htonl (*lp);
        lp = &mycopy;
#endif
        if (fwrite ((caddr_t) lp, sizeof (long), 1, (FILE *) xdrs->x_private) != 1)
                  return (FALSE);
        return (TRUE);
}

static bool_t
  xdrstdio_getbytes (xdrs, addr, len)
     XDR *xdrs;
     caddr_t addr;
     u_int len;
{

        if ((len != 0) && (fread (addr, (int) len, 1, (FILE *) xdrs->x_private) != 1))
                return (FALSE);
        return (TRUE);
}

static bool_t
  xdrstdio_putbytes (xdrs, addr, len)
     XDR *xdrs;
     caddr_t addr;
     u_int len;
{

        if ((len != 0) && (fwrite (addr, (int) len, 1, (FILE *) xdrs->x_private) != 1))
                return (FALSE);
        return (TRUE);
}

static u_int
  xdrstdio_getpos (xdrs)
     XDR *xdrs;
{

        return ((u_int) ftell ((FILE *) xdrs->x_private));
}

static bool_t
  xdrstdio_setpos (xdrs, pos)
     XDR *xdrs;
     u_int pos;
{

        return ((fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0) ?
                FALSE : TRUE);
}

static long *
  xdrstdio_inline (xdrs, len)
     XDR *xdrs;
     u_int len;
{

        /*
         * Must do some work to implement this: must insure
         * enough data in the underlying stdio buffer,
         * that the buffer is aligned so that we can indirect through a
         * long *, and stuff this pointer in xdrs->x_buf.  Doing
         * a fread or fwrite to a scratch buffer would defeat
         * most of the gains to be had here and require storage
         * management on this buffer, so we don't do this.
         */
        return (NULL);
}

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