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Annotation of src/lib/libc/rpc/xdr_reference.c, Revision 1.1

1.1     ! cgd         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:
        !            30: #if defined(LIBC_SCCS) && !defined(lint)
        !            31: /*static char *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/
        !            32: /*static char *sccsid = "from: @(#)xdr_reference.c     2.1 88/07/29 4.0 RPCSRC";*/
        !            33: static char *rcsid = "$Id: xdr_reference.c,v 1.3 1993/08/26 00:53:53 jtc Exp $";
        !            34: #endif
        !            35:
        !            36: /*
        !            37:  * xdr_reference.c, Generic XDR routines impelmentation.
        !            38:  *
        !            39:  * Copyright (C) 1987, Sun Microsystems, Inc.
        !            40:  *
        !            41:  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
        !            42:  * "pointers".  See xdr.h for more info on the interface to xdr.
        !            43:  */
        !            44:
        !            45: #include <stdio.h>
        !            46: #include <rpc/types.h>
        !            47: #include <rpc/xdr.h>
        !            48:
        !            49: #define LASTUNSIGNED   ((u_int)0-1)
        !            50:
        !            51: /*
        !            52:  * XDR an indirect pointer
        !            53:  * xdr_reference is for recursively translating a structure that is
        !            54:  * referenced by a pointer inside the structure that is currently being
        !            55:  * translated.  pp references a pointer to storage. If *pp is null
        !            56:  * the  necessary storage is allocated.
        !            57:  * size is the sizeof the referneced structure.
        !            58:  * proc is the routine to handle the referenced structure.
        !            59:  */
        !            60: bool_t
        !            61: xdr_reference(xdrs, pp, size, proc)
        !            62:        register XDR *xdrs;
        !            63:        caddr_t *pp;            /* the pointer to work on */
        !            64:        u_int size;             /* size of the object pointed to */
        !            65:        xdrproc_t proc;         /* xdr routine to handle the object */
        !            66: {
        !            67:        register caddr_t loc = *pp;
        !            68:        register bool_t stat;
        !            69:
        !            70:        if (loc == NULL)
        !            71:                switch (xdrs->x_op) {
        !            72:                case XDR_FREE:
        !            73:                        return (TRUE);
        !            74:
        !            75:                case XDR_DECODE:
        !            76:                        *pp = loc = (caddr_t) mem_alloc(size);
        !            77:                        if (loc == NULL) {
        !            78:                                (void) fprintf(stderr,
        !            79:                                    "xdr_reference: out of memory\n");
        !            80:                                return (FALSE);
        !            81:                        }
        !            82:                        bzero(loc, (int)size);
        !            83:                        break;
        !            84:        }
        !            85:
        !            86:        stat = (*proc)(xdrs, loc, LASTUNSIGNED);
        !            87:
        !            88:        if (xdrs->x_op == XDR_FREE) {
        !            89:                mem_free(loc, size);
        !            90:                *pp = NULL;
        !            91:        }
        !            92:        return (stat);
        !            93: }
        !            94:
        !            95:
        !            96: /*
        !            97:  * xdr_pointer():
        !            98:  *
        !            99:  * XDR a pointer to a possibly recursive data structure. This
        !           100:  * differs with xdr_reference in that it can serialize/deserialiaze
        !           101:  * trees correctly.
        !           102:  *
        !           103:  *  What's sent is actually a union:
        !           104:  *
        !           105:  *  union object_pointer switch (boolean b) {
        !           106:  *  case TRUE: object_data data;
        !           107:  *  case FALSE: void nothing;
        !           108:  *  }
        !           109:  *
        !           110:  * > objpp: Pointer to the pointer to the object.
        !           111:  * > obj_size: size of the object.
        !           112:  * > xdr_obj: routine to XDR an object.
        !           113:  *
        !           114:  */
        !           115: bool_t
        !           116: xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
        !           117:        register XDR *xdrs;
        !           118:        char **objpp;
        !           119:        u_int obj_size;
        !           120:        xdrproc_t xdr_obj;
        !           121: {
        !           122:
        !           123:        bool_t more_data;
        !           124:
        !           125:        more_data = (*objpp != NULL);
        !           126:        if (! xdr_bool(xdrs,&more_data)) {
        !           127:                return (FALSE);
        !           128:        }
        !           129:        if (! more_data) {
        !           130:                *objpp = NULL;
        !           131:                return (TRUE);
        !           132:        }
        !           133:        return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
        !           134: }

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