1 /* $NetBSD: xdr_reference.c,v 1.6 1997/07/13 20:13:32 christos 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 1.6 1997/07/13 20:13:32 christos 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 <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <rpc/types.h> 55 #include <rpc/xdr.h> 56 57 /* 58 * XDR an indirect pointer 59 * xdr_reference is for recursively translating a structure that is 60 * referenced by a pointer inside the structure that is currently being 61 * translated. pp references a pointer to storage. If *pp is null 62 * the necessary storage is allocated. 63 * size is the sizeof the referneced structure. 64 * proc is the routine to handle the referenced structure. 65 */ 66 bool_t 67 xdr_reference(xdrs, pp, size, proc) 68 register XDR *xdrs; 69 caddr_t *pp; /* the pointer to work on */ 70 u_int size; /* size of the object pointed to */ 71 xdrproc_t proc; /* xdr routine to handle the object */ 72 { 73 register caddr_t loc = *pp; 74 register bool_t stat; 75 76 if (loc == NULL) 77 switch (xdrs->x_op) { 78 case XDR_FREE: 79 return (TRUE); 80 81 case XDR_DECODE: 82 *pp = loc = (caddr_t) mem_alloc(size); 83 if (loc == NULL) { 84 (void) fprintf(stderr, 85 "xdr_reference: out of memory\n"); 86 return (FALSE); 87 } 88 memset(loc, 0, (int)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 register 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