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 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char *sccsid = "@(#)xdr_reference.c 1.11 87/08/11 SMI"; 35 static char *sccsid = "@(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC"; 36 static char *rcsid = "$FreeBSD$"; 37 #endif 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 /* 42 * xdr_reference.c, Generic XDR routines impelmentation. 43 * 44 * Copyright (C) 1987, Sun Microsystems, Inc. 45 * 46 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 47 * "pointers". See xdr.h for more info on the interface to xdr. 48 */ 49 50 #include "namespace.h" 51 #include <err.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 56 #include <rpc/types.h> 57 #include <rpc/xdr.h> 58 #include "libc_private.h" 59 60 /* 61 * XDR an indirect pointer 62 * xdr_reference is for recursively translating a structure that is 63 * referenced by a pointer inside the structure that is currently being 64 * translated. pp references a pointer to storage. If *pp is null 65 * the necessary storage is allocated. 66 * size is the sizeof the referneced structure. 67 * proc is the routine to handle the referenced structure. 68 */ 69 bool_t 70 xdr_reference(xdrs, pp, size, proc) 71 XDR *xdrs; 72 caddr_t *pp; /* the pointer to work on */ 73 u_int size; /* size of the object pointed to */ 74 xdrproc_t proc; /* xdr routine to handle the object */ 75 { 76 caddr_t loc = *pp; 77 bool_t stat; 78 79 if (loc == NULL) 80 switch (xdrs->x_op) { 81 case XDR_FREE: 82 return (TRUE); 83 84 case XDR_DECODE: 85 *pp = loc = (caddr_t) mem_alloc(size); 86 if (loc == NULL) { 87 warnx("xdr_reference: out of memory"); 88 return (FALSE); 89 } 90 memset(loc, 0, size); 91 break; 92 93 case XDR_ENCODE: 94 break; 95 } 96 97 stat = (*proc)(xdrs, loc); 98 99 if (xdrs->x_op == XDR_FREE) { 100 mem_free(loc, size); 101 *pp = NULL; 102 } 103 return (stat); 104 } 105 106 107 /* 108 * xdr_pointer(): 109 * 110 * XDR a pointer to a possibly recursive data structure. This 111 * differs with xdr_reference in that it can serialize/deserialiaze 112 * trees correctly. 113 * 114 * What's sent is actually a union: 115 * 116 * union object_pointer switch (boolean b) { 117 * case TRUE: object_data data; 118 * case FALSE: void nothing; 119 * } 120 * 121 * > objpp: Pointer to the pointer to the object. 122 * > obj_size: size of the object. 123 * > xdr_obj: routine to XDR an object. 124 * 125 */ 126 bool_t 127 xdr_pointer(xdrs,objpp,obj_size,xdr_obj) 128 XDR *xdrs; 129 char **objpp; 130 u_int obj_size; 131 xdrproc_t xdr_obj; 132 { 133 134 bool_t more_data; 135 136 more_data = (*objpp != NULL); 137 if (! xdr_bool(xdrs,&more_data)) { 138 return (FALSE); 139 } 140 if (! more_data) { 141 *objpp = NULL; 142 return (TRUE); 143 } 144 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 145 } 146