1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)xdr_reference.c 1.11 87/08/11 SMI 30 * @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC 31 * $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ 32 * $FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.12 2004/10/16 06:32:43 obrien Exp $ 33 */ 34 35 /* 36 * xdr_reference.c, Generic XDR routines impelmentation. 37 * 38 * Copyright (C) 1987, Sun Microsystems, Inc. 39 * 40 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 41 * "pointers". See xdr.h for more info on the interface to xdr. 42 */ 43 44 #include "namespace.h" 45 #include <err.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 50 #include <rpc/types.h> 51 #include <rpc/xdr.h> 52 #include "un-namespace.h" 53 54 #include "libc_private.h" 55 56 /* 57 * XDR an indirect pointer 58 * xdr_reference is for recursively translating a structure that is 59 * referenced by a pointer inside the structure that is currently being 60 * translated. pp references a pointer to storage. If *pp is null 61 * the necessary storage is allocated. 62 * size is the sizeof the referneced structure. 63 * proc is the routine to handle the referenced structure. 64 * 65 * Parameters: 66 * pp: the pointer to work on 67 * size: size of the object pointed to 68 * proc: xdr routine to handle the object 69 */ 70 bool_t 71 xdr_reference(XDR *xdrs, caddr_t *pp, u_int size, xdrproc_t proc) 72 { 73 caddr_t loc = *pp; 74 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 warnx("xdr_reference: out of memory"); 85 return (FALSE); 86 } 87 memset(loc, 0, size); 88 break; 89 90 case XDR_ENCODE: 91 break; 92 } 93 94 stat = (*proc)(xdrs, loc); 95 96 if (xdrs->x_op == XDR_FREE) { 97 mem_free(loc, size); 98 *pp = NULL; 99 } 100 return (stat); 101 } 102 103 104 /* 105 * xdr_pointer(): 106 * 107 * XDR a pointer to a possibly recursive data structure. This 108 * differs with xdr_reference in that it can serialize/deserialiaze 109 * trees correctly. 110 * 111 * What's sent is actually a union: 112 * 113 * union object_pointer switch (boolean b) { 114 * case TRUE: object_data data; 115 * case FALSE: void nothing; 116 * } 117 * 118 * > objpp: Pointer to the pointer to the object. 119 * > obj_size: size of the object. 120 * > xdr_obj: routine to XDR an object. 121 * 122 */ 123 bool_t 124 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj) 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