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/*

 * 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(LIBC_SCCS) && !defined(lint)

/*static char *sccsid = "from: @(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";*/

/*static char *sccsid = "from: @(#)xdr_stdio.c  2.1 88/07/29 4.0 RPCSRC";*/

static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_stdio.c,v 1.7 1999/08/28 00:02:56 peter Exp $";

#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 int32_t *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(int32_t), 1,

                (FILE *)xdrs->x_private) != 1)

                return (FALSE);

        *lp = (long)ntohl((int32_t)*lp);

        return (TRUE);

}

static bool_t

xdrstdio_putlong(xdrs, lp)

        XDR *xdrs;

        long *lp;

{

        long mycopy = (long)htonl((int32_t)*lp);

        if (fwrite((caddr_t)&mycopy, sizeof(int32_t), 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 int32_t *

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);

}