Annotation of src/lib/libc/rpc/xdr_reference.c, Revision 1.16
1.16 ! abs 1: /* $NetBSD: xdr_reference.c,v 1.15 2008/04/25 17:44:44 christos Exp $ */
1.3 cgd 2:
1.1 cgd 3: /*
4: * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5: * unrestricted use provided that this legend is included on all tape
6: * media and as a part of the software program in whole or part. Users
7: * may copy or modify Sun RPC without charge, but are not authorized
8: * to license or distribute it to anyone else except as part of a product or
9: * program developed by the user.
10: *
11: * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12: * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13: * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14: *
15: * Sun RPC is provided with no support and without any obligation on the
16: * part of Sun Microsystems, Inc. to assist in its use, correction,
17: * modification or enhancement.
18: *
19: * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20: * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21: * OR ANY PART THEREOF.
22: *
23: * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24: * or profits or other special, indirect and consequential damages, even if
25: * Sun has been advised of the possibility of such damages.
26: *
27: * Sun Microsystems, Inc.
28: * 2550 Garcia Avenue
29: * Mountain View, California 94043
30: */
31:
1.6 christos 32: #include <sys/cdefs.h>
1.1 cgd 33: #if defined(LIBC_SCCS) && !defined(lint)
1.6 christos 34: #if 0
35: static char *sccsid = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
36: static char *sccsid = "@(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC";
37: #else
1.16 ! abs 38: __RCSID("$NetBSD: xdr_reference.c,v 1.15 2008/04/25 17:44:44 christos Exp $");
1.6 christos 39: #endif
1.1 cgd 40: #endif
41:
42: /*
1.14 wiz 43: * xdr_reference.c, Generic XDR routines implementation.
1.1 cgd 44: *
45: * Copyright (C) 1987, Sun Microsystems, Inc.
46: *
47: * These are the "non-trivial" xdr primitives used to serialize and de-serialize
48: * "pointers". See xdr.h for more info on the interface to xdr.
49: */
50:
1.7 jtc 51: #include "namespace.h"
1.11 lukem 52:
53: #include <err.h>
1.1 cgd 54: #include <stdio.h>
1.2 cgd 55: #include <stdlib.h>
1.4 jtc 56: #include <string.h>
1.11 lukem 57:
1.1 cgd 58: #include <rpc/types.h>
59: #include <rpc/xdr.h>
1.7 jtc 60:
61: #ifdef __weak_alias
1.13 mycroft 62: __weak_alias(xdr_pointer,_xdr_pointer)
63: __weak_alias(xdr_reference,_xdr_reference)
1.7 jtc 64: #endif
1.1 cgd 65:
66: /*
67: * XDR an indirect pointer
68: * xdr_reference is for recursively translating a structure that is
69: * referenced by a pointer inside the structure that is currently being
70: * translated. pp references a pointer to storage. If *pp is null
71: * the necessary storage is allocated.
72: * size is the sizeof the referneced structure.
73: * proc is the routine to handle the referenced structure.
74: */
75: bool_t
1.16 ! abs 76: xdr_reference(XDR *xdrs, caddr_t *pp, u_int size, xdrproc_t proc)
1.1 cgd 77: {
1.11 lukem 78: caddr_t loc = *pp;
79: bool_t stat;
1.1 cgd 80:
81: if (loc == NULL)
82: switch (xdrs->x_op) {
83: case XDR_FREE:
84: return (TRUE);
85:
86: case XDR_DECODE:
1.15 christos 87: *pp = loc = mem_alloc(size);
1.1 cgd 88: if (loc == NULL) {
1.11 lukem 89: warnx("xdr_reference: out of memory");
1.1 cgd 90: return (FALSE);
91: }
1.12 christos 92: memset(loc, 0, size);
1.1 cgd 93: break;
1.6 christos 94:
95: case XDR_ENCODE:
96: break;
97: }
1.1 cgd 98:
1.5 jtc 99: stat = (*proc)(xdrs, loc);
1.1 cgd 100:
101: if (xdrs->x_op == XDR_FREE) {
102: mem_free(loc, size);
103: *pp = NULL;
104: }
105: return (stat);
106: }
107:
108:
109: /*
110: * xdr_pointer():
111: *
112: * XDR a pointer to a possibly recursive data structure. This
113: * differs with xdr_reference in that it can serialize/deserialiaze
114: * trees correctly.
115: *
116: * What's sent is actually a union:
117: *
118: * union object_pointer switch (boolean b) {
119: * case TRUE: object_data data;
120: * case FALSE: void nothing;
121: * }
122: *
123: * > objpp: Pointer to the pointer to the object.
124: * > obj_size: size of the object.
125: * > xdr_obj: routine to XDR an object.
126: *
127: */
128: bool_t
1.16 ! abs 129: xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj)
1.1 cgd 130: {
1.10 lukem 131:
1.1 cgd 132: bool_t more_data;
133:
134: more_data = (*objpp != NULL);
135: if (! xdr_bool(xdrs,&more_data)) {
136: return (FALSE);
137: }
138: if (! more_data) {
139: *objpp = NULL;
140: return (TRUE);
141: }
1.10 lukem 142: return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
1.1 cgd 143: }
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