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 __FBSDID("$FreeBSD$"); 38 39 /* 40 * xdr_reference.c, Generic XDR routines implementation. 41 * 42 * Copyright (C) 1987, Sun Microsystems, Inc. 43 * 44 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 45 * "pointers". See xdr.h for more info on the interface to xdr. 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/malloc.h> 51 52 #include <rpc/types.h> 53 #include <rpc/xdr.h> 54 55 /* 56 * XDR an indirect pointer 57 * xdr_reference is for recursively translating a structure that is 58 * referenced by a pointer inside the structure that is currently being 59 * translated. pp references a pointer to storage. If *pp is null 60 * the necessary storage is allocated. 61 * size is the sizeof the referneced structure. 62 * proc is the routine to handle the referenced structure. 63 */ 64 bool_t 65 xdr_reference(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 caddr_t loc = *pp; 71 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 printf("xdr_reference: out of memory"); 82 return (FALSE); 83 } 84 memset(loc, 0, size); 85 break; 86 87 case XDR_ENCODE: 88 break; 89 } 90 91 stat = (*proc)(xdrs, loc); 92 93 if (xdrs->x_op == XDR_FREE) { 94 mem_free(loc, size); 95 *pp = NULL; 96 } 97 return (stat); 98 } 99 100 /* 101 * xdr_pointer(): 102 * 103 * XDR a pointer to a possibly recursive data structure. This 104 * differs with xdr_reference in that it can serialize/deserialiaze 105 * trees correctly. 106 * 107 * What's sent is actually a union: 108 * 109 * union object_pointer switch (boolean b) { 110 * case TRUE: object_data data; 111 * case FALSE: void nothing; 112 * } 113 * 114 * > objpp: Pointer to the pointer to the object. 115 * > obj_size: size of the object. 116 * > xdr_obj: routine to XDR an object. 117 * 118 */ 119 bool_t 120 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj) 121 { 122 123 bool_t more_data; 124 125 more_data = (*objpp != NULL); 126 if (! xdr_bool(xdrs,&more_data)) { 127 return (FALSE); 128 } 129 if (! more_data) { 130 *objpp = NULL; 131 return (TRUE); 132 } 133 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 134 } 135