Serving the Web/ServingTheWeb1995.disc1of1.iso/linux/slacksrce/d/libc/libc-4.6/libc-4/libc-linux/rpc/xdr_array.c

C/C++ Source or Header | 1994-04-01 | 4.4 KB | 173 lines

/* @(#)xdr_array.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_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
#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 <rpc/types.h>
#include <rpc/xdr.h>
#include <strings.h>

#ifdef __STDC__
#include <stdlib.h>
#endif

#define LASTUNSIGNED    ((u_int)0-1)

#if NLS
#include "nl_types.h"
#endif

/*
 * 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 NLS
    libc_nls_init();
#endif

    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,
#if NLS
                           "xdr_array: %s\n",
                        catgets(_libc_cat, RpcMiscSet,
                               RpcMiscOutOfMemory,
                               "out of memory"));
#else
                    "xdr_array: out of memory\n");
#endif
                return (FALSE);
            }
            bzero(target, nodesize);
            break;

        case XDR_FREE:
            return (TRUE);
    }

    /*
     * 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);
}