1 /* $NetBSD: xdr_reference.c,v 1.16 2012/06/25 22:32:45 abs Exp $ */ 2 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 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 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 38 __RCSID("$NetBSD: xdr_reference.c,v 1.16 2012/06/25 22:32:45 abs Exp $"); 39 #endif 40 #endif 41 42 /* 43 * xdr_reference.c, Generic XDR routines implementation. 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 51 #include "namespace.h" 52 53 #include <err.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 58 #include <rpc/types.h> 59 #include <rpc/xdr.h> 60 61 #ifdef __weak_alias 62 __weak_alias(xdr_pointer,_xdr_pointer) 63 __weak_alias(xdr_reference,_xdr_reference) 64 #endif 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 76 xdr_reference(XDR *xdrs, caddr_t *pp, u_int size, xdrproc_t proc) 77 { 78 caddr_t loc = *pp; 79 bool_t stat; 80 81 if (loc == NULL) 82 switch (xdrs->x_op) { 83 case XDR_FREE: 84 return (TRUE); 85 86 case XDR_DECODE: 87 *pp = loc = mem_alloc(size); 88 if (loc == NULL) { 89 warnx("xdr_reference: out of memory"); 90 return (FALSE); 91 } 92 memset(loc, 0, size); 93 break; 94 95 case XDR_ENCODE: 96 break; 97 } 98 99 stat = (*proc)(xdrs, loc); 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 129 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, 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