1 /* $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft 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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char *sccsid2 = "@(#)xdr_reference.c 1.11 87/08/11 SMI"; 34 static char *sccsid = "@(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC"; 35 #endif 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * xdr_reference.c, Generic XDR routines impelmentation. 41 * 42 * Copyright (C) 1987, Sun Microsystems, Inc. 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