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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_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";*/

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

static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_array.c,v 1.8 1999/08/28 00:02:55 peter Exp $";

#endif

/*

 * xdr_array.c, Generic XDR routines impelmentation.

 *

 * Copyright (C) 1984, Sun Microsystems, Inc.

 *

 * These are the "non-trivial" xdr primitives used to serialize and de-serialize

 * arrays.  See xdr.h for more info on the interface to xdr.

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <rpc/types.h>

#include <rpc/xdr.h>

#define LASTUNSIGNED ((u_int) 0-1)

/*

 * XDR an array of arbitrary elements

 * *addrp is a pointer to the array, *sizep is the number of elements.

 * If addrp is NULL (*sizep * elsize) bytes are allocated.

 * elsize is the size (in bytes) of each element, and elproc is the

 * xdr procedure to call to handle each element of the array.

 */

bool_t

xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)

        register XDR *xdrs;

        caddr_t *addrp;         /* array pointer */

        u_int *sizep;           /* number of elements */

        u_int maxsize;          /* max numberof elements */

        u_int elsize;           /* size in bytes of each element */

        xdrproc_t elproc;       /* xdr routine to handle each element */

{

        register u_int i;

        register caddr_t target = *addrp;

        register u_int c;  /* the actual element count */

        register bool_t stat = TRUE;

        register u_int nodesize;

        /* like strings, arrays are really counted arrays */

        if (! xdr_u_int(xdrs, sizep)) {

                return (FALSE);

        }

        c = *sizep;

        if ((c > maxsize) && (xdrs->x_op != XDR_FREE)) {

                return (FALSE);

        }

        nodesize = c * elsize;

        /*

         * if we are deserializing, we may need to allocate an array.

         * We also save time by checking for a null array if we are freeing.

         */

        if (target == NULL)

                switch (xdrs->x_op) {

                case XDR_DECODE:

                        if (c == 0)

                                return (TRUE);

                        *addrp = target = mem_alloc(nodesize);

                        if (target == NULL) {

                                (void) fprintf(stderr,

                                        "xdr_array: out of memory\n");

                                return (FALSE);

                        }

                        memset(target, 0, nodesize);

                        break;

                case XDR_FREE:

                        return (TRUE);

                case XDR_ENCODE:  /* to avoid warning */

                        break;

        }

        /*

         * now we xdr each element of array

         */

        for (i = 0; (i < c) && stat; i++) {

                stat = (*elproc)(xdrs, target, LASTUNSIGNED);

                target += elsize;

        }

        /*

         * the array may need freeing

         */

        if (xdrs->x_op == XDR_FREE) {

                mem_free(*addrp, nodesize);

                *addrp = NULL;

        }

        return (stat);

}

/*

 * xdr_vector():

 *

 * XDR a fixed length array. Unlike variable-length arrays,

 * the storage of fixed length arrays is static and unfreeable.

 * > basep: base of the array

 * > size: size of the array

 * > elemsize: size of each element

 * > xdr_elem: routine to XDR each element

 */

bool_t

xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem)

        register XDR *xdrs;

        register char *basep;

        register u_int nelem;

        register u_int elemsize;

        register xdrproc_t xdr_elem;

{

        register u_int i;

        register char *elptr;

        elptr = basep;

        for (i = 0; i < nelem; i++) {

                if (! (*xdr_elem)(xdrs, elptr, LASTUNSIGNED)) {

                        return(FALSE);

                }

                elptr += elemsize;

        }

        return(TRUE);

}