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, MERCHANTIBILITY 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 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char *rcsid = "$OpenBSD: xdr_reference.c,v 1.5 2005/04/01 07:44:04 otto Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 /* 35 * xdr_reference.c, Generic XDR routines impelmentation. 36 * 37 * Copyright (C) 1987, Sun Microsystems, Inc. 38 * 39 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 40 * "pointers". See xdr.h for more info on the interface to xdr. 41 */ 42 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <rpc/types.h> 47 #include <rpc/xdr.h> 48 49 /* 50 * XDR an indirect pointer 51 * xdr_reference is for recursively translating a structure that is 52 * referenced by a pointer inside the structure that is currently being 53 * translated. pp references a pointer to storage. If *pp is null 54 * the necessary storage is allocated. 55 * size is the sizeof the referneced structure. 56 * proc is the routine to handle the referenced structure. 57 */ 58 bool_t 59 xdr_reference(XDR *xdrs, 60 caddr_t *pp, /* the pointer to work on */ 61 u_int size, /* size of the object pointed to */ 62 xdrproc_t proc) /* xdr routine to handle the object */ 63 { 64 caddr_t loc = *pp; 65 bool_t stat; 66 67 if (loc == NULL) 68 switch (xdrs->x_op) { 69 case XDR_FREE: 70 return (TRUE); 71 72 case XDR_DECODE: 73 *pp = loc = (caddr_t) mem_alloc(size); 74 if (loc == NULL) { 75 (void) fprintf(stderr, 76 "xdr_reference: out of memory\n"); 77 return (FALSE); 78 } 79 memset(loc, 0, (int)size); 80 break; 81 } 82 83 stat = (*proc)(xdrs, loc); 84 85 if (xdrs->x_op == XDR_FREE) { 86 mem_free(loc, size); 87 *pp = NULL; 88 } 89 return (stat); 90 } 91 92 93 /* 94 * xdr_pointer(): 95 * 96 * XDR a pointer to a possibly recursive data structure. This 97 * differs with xdr_reference in that it can serialize/deserialiaze 98 * trees correctly. 99 * 100 * What's sent is actually a union: 101 * 102 * union object_pointer switch (boolean b) { 103 * case TRUE: object_data data; 104 * case FALSE: void nothing; 105 * } 106 * 107 * > objpp: Pointer to the pointer to the object. 108 * > obj_size: size of the object. 109 * > xdr_obj: routine to XDR an object. 110 * 111 */ 112 bool_t 113 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj) 114 { 115 116 bool_t more_data; 117 118 more_data = (*objpp != NULL); 119 if (! xdr_bool(xdrs,&more_data)) { 120 return (FALSE); 121 } 122 if (! more_data) { 123 *objpp = NULL; 124 return (TRUE); 125 } 126 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 127 } 128