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Annotation of 43BSD/contrib/sunrpc/xdr_array.c, revision 1.1

1.1     ! root        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: #ifndef lint
        !            30: static char sccsid[] = "@(#)xdr_array.c 1.2 85/02/26 Copyr 1984 Sun Micro";
        !            31: #endif
        !            32: 
        !            33: /*
        !            34:  * xdr_array.c, Generic XDR routines impelmentation.
        !            35:  *
        !            36:  * Copyright (C) 1984, Sun Microsystems, Inc.
        !            37:  *
        !            38:  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
        !            39:  * arrays.  See xdr.h for more info on the interface to xdr.
        !            40:  */
        !            41: 
        !            42: #include "types.h"
        !            43: #include "xdr.h"
        !            44: #include <stdio.h>
        !            45: #define LASTUNSIGNED   ((u_int)0-1)
        !            46: 
        !            47: char *mem_alloc();
        !            48: 
        !            49: /*
        !            50:  * XDR an array of arbitrary elements
        !            51:  * *addrp is a pointer to the array, *sizep is the number of elements.
        !            52:  * If addrp is NULL (*sizep * elsize) bytes are allocated.
        !            53:  * elsize is the size (in bytes) of each element, and elproc is the
        !            54:  * xdr procedure to call to handle each element of the array.
        !            55:  */
        !            56: bool_t
        !            57: xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)
        !            58:        register XDR *xdrs;
        !            59:        caddr_t *addrp;         /* array pointer */
        !            60:        u_int *sizep;           /* number of elements */
        !            61:        u_int maxsize;          /* max numberof elements */
        !            62:        u_int elsize;           /* size in bytes of each element */
        !            63:        xdrproc_t elproc;       /* xdr routine to handle each element */
        !            64: {
        !            65:        register u_int i;
        !            66:        register caddr_t target = *addrp;
        !            67:        register u_int c;  /* the actual element count */
        !            68:        register bool_t stat = TRUE;
        !            69:        register int nodesize;
        !            70: 
        !            71:        /* like strings, arrays are really counted arrays */
        !            72:        if (! xdr_u_int(xdrs, sizep)) {
        !            73:                return (FALSE);
        !            74:        }
        !            75:        c = *sizep;
        !            76:        if ((c > maxsize) && (xdrs->x_op != XDR_FREE)) {
        !            77:                return (FALSE);
        !            78:        }
        !            79:        nodesize = c * elsize;
        !            80: 
        !            81:        /*
        !            82:         * if we are deserializing, we may need to allocate an array.
        !            83:         * We also save time by checking for a null array if we are freeing.
        !            84:         */
        !            85:        if (target == NULL)
        !            86:                switch (xdrs->x_op) {
        !            87:                case XDR_DECODE:
        !            88:                        if (c == 0)
        !            89:                                return (TRUE);
        !            90:                        *addrp = target = mem_alloc(nodesize);
        !            91:                        if (target == NULL) {
        !            92:                                fprintf(stderr, "xdr_array: out of memory\n");
        !            93:                                return (FALSE);
        !            94:                        }
        !            95:                        bzero(target, nodesize);
        !            96:                        break;
        !            97: 
        !            98:                case XDR_FREE:
        !            99:                        return (TRUE);
        !           100:        }
        !           101:        
        !           102:        /*
        !           103:         * now we xdr each element of array
        !           104:         */
        !           105:        for (i = 0; (i < c) && stat; i++) {
        !           106:                stat = (*elproc)(xdrs, target, LASTUNSIGNED);
        !           107:                target += elsize;
        !           108:        }
        !           109: 
        !           110:        /*
        !           111:         * the array may need freeing
        !           112:         */
        !           113:        if (xdrs->x_op == XDR_FREE) {
        !           114:                mem_free(*addrp, nodesize);
        !           115:                *addrp = NULL;
        !           116:        }
        !           117:        return (stat);
        !           118: }

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