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