1 /* $NetBSD: xdr_reference.c,v 1.3 1995/02/25 03:02:08 cgd 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 *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/ 34 /*static char *sccsid = "from: @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC";*/ 35 static char *rcsid = "$NetBSD: xdr_reference.c,v 1.3 1995/02/25 03:02:08 cgd Exp $"; 36 #endif 37 38 /* 39 * xdr_reference.c, Generic XDR routines impelmentation. 40 * 41 * Copyright (C) 1987, Sun Microsystems, Inc. 42 * 43 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 44 * "pointers". See xdr.h for more info on the interface to xdr. 45 */ 46 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <rpc/types.h> 50 #include <rpc/xdr.h> 51 52 #define LASTUNSIGNED ((u_int)0-1) 53 54 /* 55 * XDR an indirect pointer 56 * xdr_reference is for recursively translating a structure that is 57 * referenced by a pointer inside the structure that is currently being 58 * translated. pp references a pointer to storage. If *pp is null 59 * the necessary storage is allocated. 60 * size is the sizeof the referneced structure. 61 * proc is the routine to handle the referenced structure. 62 */ 63 bool_t 64 xdr_reference(xdrs, pp, size, proc) 65 register XDR *xdrs; 66 caddr_t *pp; /* the pointer to work on */ 67 u_int size; /* size of the object pointed to */ 68 xdrproc_t proc; /* xdr routine to handle the object */ 69 { 70 register caddr_t loc = *pp; 71 register bool_t stat; 72 73 if (loc == NULL) 74 switch (xdrs->x_op) { 75 case XDR_FREE: 76 return (TRUE); 77 78 case XDR_DECODE: 79 *pp = loc = (caddr_t) mem_alloc(size); 80 if (loc == NULL) { 81 (void) fprintf(stderr, 82 "xdr_reference: out of memory\n"); 83 return (FALSE); 84 } 85 bzero(loc, (int)size); 86 break; 87 } 88 89 stat = (*proc)(xdrs, loc, LASTUNSIGNED); 90 91 if (xdrs->x_op == XDR_FREE) { 92 mem_free(loc, size); 93 *pp = NULL; 94 } 95 return (stat); 96 } 97 98 99 /* 100 * xdr_pointer(): 101 * 102 * XDR a pointer to a possibly recursive data structure. This 103 * differs with xdr_reference in that it can serialize/deserialiaze 104 * trees correctly. 105 * 106 * What's sent is actually a union: 107 * 108 * union object_pointer switch (boolean b) { 109 * case TRUE: object_data data; 110 * case FALSE: void nothing; 111 * } 112 * 113 * > objpp: Pointer to the pointer to the object. 114 * > obj_size: size of the object. 115 * > xdr_obj: routine to XDR an object. 116 * 117 */ 118 bool_t 119 xdr_pointer(xdrs,objpp,obj_size,xdr_obj) 120 register XDR *xdrs; 121 char **objpp; 122 u_int obj_size; 123 xdrproc_t xdr_obj; 124 { 125 126 bool_t more_data; 127 128 more_data = (*objpp != NULL); 129 if (! xdr_bool(xdrs,&more_data)) { 130 return (FALSE); 131 } 132 if (! more_data) { 133 *objpp = NULL; 134 return (TRUE); 135 } 136 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 137 } 138