1 /* $NetBSD: xdr_reference.c,v 1.7 1997/07/21 14:08:47 jtc 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 1.7 1997/07/21 14:08:47 jtc Exp $"); 39 #endif 40 #endif 41 42 /* 43 * xdr_reference.c, Generic XDR routines impelmentation. 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 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <rpc/types.h> 56 #include <rpc/xdr.h> 57 58 #ifdef __weak_alias 59 __weak_alias(xdr_pointer,_xdr_pointer); 60 __weak_alias(xdr_reference,_xdr_reference); 61 #endif 62 63 /* 64 * XDR an indirect pointer 65 * xdr_reference is for recursively translating a structure that is 66 * referenced by a pointer inside the structure that is currently being 67 * translated. pp references a pointer to storage. If *pp is null 68 * the necessary storage is allocated. 69 * size is the sizeof the referneced structure. 70 * proc is the routine to handle the referenced structure. 71 */ 72 bool_t 73 xdr_reference(xdrs, pp, size, proc) 74 register XDR *xdrs; 75 caddr_t *pp; /* the pointer to work on */ 76 u_int size; /* size of the object pointed to */ 77 xdrproc_t proc; /* xdr routine to handle the object */ 78 { 79 register caddr_t loc = *pp; 80 register bool_t stat; 81 82 if (loc == NULL) 83 switch (xdrs->x_op) { 84 case XDR_FREE: 85 return (TRUE); 86 87 case XDR_DECODE: 88 *pp = loc = (caddr_t) mem_alloc(size); 89 if (loc == NULL) { 90 (void) fprintf(stderr, 91 "xdr_reference: out of memory\n"); 92 return (FALSE); 93 } 94 memset(loc, 0, (int)size); 95 break; 96 97 case XDR_ENCODE: 98 break; 99 } 100 101 stat = (*proc)(xdrs, loc); 102 103 if (xdrs->x_op == XDR_FREE) { 104 mem_free(loc, size); 105 *pp = NULL; 106 } 107 return (stat); 108 } 109 110 111 /* 112 * xdr_pointer(): 113 * 114 * XDR a pointer to a possibly recursive data structure. This 115 * differs with xdr_reference in that it can serialize/deserialiaze 116 * trees correctly. 117 * 118 * What's sent is actually a union: 119 * 120 * union object_pointer switch (boolean b) { 121 * case TRUE: object_data data; 122 * case FALSE: void nothing; 123 * } 124 * 125 * > objpp: Pointer to the pointer to the object. 126 * > obj_size: size of the object. 127 * > xdr_obj: routine to XDR an object. 128 * 129 */ 130 bool_t 131 xdr_pointer(xdrs,objpp,obj_size,xdr_obj) 132 register XDR *xdrs; 133 char **objpp; 134 u_int obj_size; 135 xdrproc_t xdr_obj; 136 { 137 138 bool_t more_data; 139 140 more_data = (*objpp != NULL); 141 if (! xdr_bool(xdrs,&more_data)) { 142 return (FALSE); 143 } 144 if (! more_data) { 145 *objpp = NULL; 146 return (TRUE); 147 } 148 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 149 } 150