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29 * @(#)xdr_reference.c 1.11 87/08/11 SMI
30 * @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC
31 * $FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.8 1999/08/28 00:02:56 peter Exp $
32 * $DragonFly: src/lib/libc/xdr/xdr_reference.c,v 1.2 2003/06/17 04:26:47 dillon Exp $
36 * xdr_reference.c, Generic XDR routines impelmentation.
38 * Copyright (C) 1987, Sun Microsystems, Inc.
40 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
41 * "pointers". See xdr.h for more info on the interface to xdr.
47 #include <rpc/types.h>
50 #define LASTUNSIGNED ((u_int) 0-1)
53 * XDR an indirect pointer
54 * xdr_reference is for recursively translating a structure that is
55 * referenced by a pointer inside the structure that is currently being
56 * translated. pp references a pointer to storage. If *pp is null
57 * the necessary storage is allocated.
58 * size is the sizeof the referneced structure.
59 * proc is the routine to handle the referenced structure.
62 xdr_reference(xdrs, pp, size, proc)
64 caddr_t *pp; /* the pointer to work on */
65 u_int size; /* size of the object pointed to */
66 xdrproc_t proc; /* xdr routine to handle the object */
68 register caddr_t loc = *pp;
77 *pp = loc = (caddr_t) mem_alloc(size);
79 (void) fprintf(stderr,
80 "xdr_reference: out of memory\n");
83 memset(loc, 0, (int)size);
87 stat = (*proc)(xdrs, loc, LASTUNSIGNED);
89 if (xdrs->x_op == XDR_FREE) {
100 * XDR a pointer to a possibly recursive data structure. This
101 * differs with xdr_reference in that it can serialize/deserialiaze
104 * What's sent is actually a union:
106 * union object_pointer switch (boolean b) {
107 * case TRUE: object_data data;
108 * case FALSE: void nothing;
111 * > objpp: Pointer to the pointer to the object.
112 * > obj_size: size of the object.
113 * > xdr_obj: routine to XDR an object.
117 xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
126 more_data = (*objpp != NULL);
127 if (! xdr_bool(xdrs,&more_data)) {
134 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));