1 /* @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC */
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30 #if !defined(lint) && defined(SCCSIDS)
31 static char sccsid[] = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
35 * xdr_reference.c, Generic XDR routines impelmentation.
37 * Copyright (C) 1987, Sun Microsystems, Inc.
39 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
40 * "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;
73 case XDR_ENCODE: break; /* keep gcc happy */
78 *pp = loc = (caddr_t) mem_alloc(size);
80 (void) fprintf(stderr,
81 "xdr_reference: out of memory\n");
84 memset (loc, 0, (int)size);
88 stat = (*proc)(xdrs, loc, LASTUNSIGNED);
90 if (xdrs->x_op == XDR_FREE) {
101 * XDR a pointer to a possibly recursive data structure. This
102 * differs with xdr_reference in that it can serialize/deserialiaze
105 * What's sent is actually a union:
107 * union object_pointer switch (boolean b) {
108 * case TRUE: object_data data;
109 * case FALSE: void nothing;
112 * > objpp: Pointer to the pointer to the object.
113 * > obj_size: size of the object.
114 * > xdr_obj: routine to XDR an object.
118 xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
127 more_data = (*objpp != NULL);
128 if (! xdr_bool(xdrs,&more_data)) {
135 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));