1 /* $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char *sccsid2 = "@(#)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 #endif 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 /* 42 * xdr_reference.c, Generic XDR routines impelmentation. 43 * 44 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 45 * "pointers". See xdr.h for more info on the interface to xdr. 46 */ 47 48 #include "namespace.h" 49 #include <err.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 54 #include <rpc/types.h> 55 #include <rpc/xdr.h> 56 #include "libc_private.h" 57 58 /* 59 * XDR an indirect pointer 60 * xdr_reference is for recursively translating a structure that is 61 * referenced by a pointer inside the structure that is currently being 62 * translated. pp references a pointer to storage. If *pp is null 63 * the necessary storage is allocated. 64 * size is the sizeof the referneced structure. 65 * proc is the routine to handle the referenced structure. 66 */ 67 bool_t 68 xdr_reference(xdrs, pp, size, proc) 69 XDR *xdrs; 70 caddr_t *pp; /* the pointer to work on */ 71 u_int size; /* size of the object pointed to */ 72 xdrproc_t proc; /* xdr routine to handle the object */ 73 { 74 caddr_t loc = *pp; 75 bool_t stat; 76 77 if (loc == NULL) 78 switch (xdrs->x_op) { 79 case XDR_FREE: 80 return (TRUE); 81 82 case XDR_DECODE: 83 *pp = loc = (caddr_t) mem_alloc(size); 84 if (loc == NULL) { 85 warnx("xdr_reference: out of memory"); 86 return (FALSE); 87 } 88 memset(loc, 0, size); 89 break; 90 91 case XDR_ENCODE: 92 break; 93 } 94 95 stat = (*proc)(xdrs, loc); 96 97 if (xdrs->x_op == XDR_FREE) { 98 mem_free(loc, size); 99 *pp = NULL; 100 } 101 return (stat); 102 } 103 104 105 /* 106 * xdr_pointer(): 107 * 108 * XDR a pointer to a possibly recursive data structure. This 109 * differs with xdr_reference in that it can serialize/deserialiaze 110 * trees correctly. 111 * 112 * What's sent is actually a union: 113 * 114 * union object_pointer switch (boolean b) { 115 * case TRUE: object_data data; 116 * case FALSE: void nothing; 117 * } 118 * 119 * > objpp: Pointer to the pointer to the object. 120 * > obj_size: size of the object. 121 * > xdr_obj: routine to XDR an object. 122 * 123 */ 124 bool_t 125 xdr_pointer(xdrs,objpp,obj_size,xdr_obj) 126 XDR *xdrs; 127 char **objpp; 128 u_int obj_size; 129 xdrproc_t xdr_obj; 130 { 131 132 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 } 142 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 143 } 144