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 * @(#)xdr_reference.c 1.11 87/08/11 SMI 30 * @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC 31 * $FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.8 1999/08/28 00:02:56 peter Exp $ 32 * $DragonFly: src/lib/libc/xdr/xdr_reference.c,v 1.2 2003/06/17 04:26:47 dillon 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 <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <rpc/types.h> 48 #include <rpc/xdr.h> 49 50 #define LASTUNSIGNED ((u_int) 0-1) 51 52 /* 53 * XDR an indirect pointer 54 * xdr_reference is for recursively translating a structure that is 55 * referenced by a pointer inside the structure that is currently being 56 * translated. pp references a pointer to storage. If *pp is null 57 * the necessary storage is allocated. 58 * size is the sizeof the referneced structure. 59 * proc is the routine to handle the referenced structure. 60 */ 61 bool_t 62 xdr_reference(xdrs, pp, size, proc) 63 register 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 register caddr_t loc = *pp; 69 register 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 (void) fprintf(stderr, 80 "xdr_reference: out of memory\n"); 81 return (FALSE); 82 } 83 memset(loc, 0, (int)size); 84 break; 85 } 86 87 stat = (*proc)(xdrs, loc, LASTUNSIGNED); 88 89 if (xdrs->x_op == XDR_FREE) { 90 mem_free(loc, size); 91 *pp = NULL; 92 } 93 return (stat); 94 } 95 96 97 /* 98 * xdr_pointer(): 99 * 100 * XDR a pointer to a possibly recursive data structure. This 101 * differs with xdr_reference in that it can serialize/deserialiaze 102 * trees correctly. 103 * 104 * What's sent is actually a union: 105 * 106 * union object_pointer switch (boolean b) { 107 * case TRUE: object_data data; 108 * case FALSE: void nothing; 109 * } 110 * 111 * > objpp: Pointer to the pointer to the object. 112 * > obj_size: size of the object. 113 * > xdr_obj: routine to XDR an object. 114 * 115 */ 116 bool_t 117 xdr_pointer(xdrs,objpp,obj_size,xdr_obj) 118 register XDR *xdrs; 119 char **objpp; 120 u_int obj_size; 121 xdrproc_t xdr_obj; 122 { 123 124 bool_t more_data; 125 126 more_data = (*objpp != NULL); 127 if (! xdr_bool(xdrs,&more_data)) { 128 return (FALSE); 129 } 130 if (! more_data) { 131 *objpp = NULL; 132 return (TRUE); 133 } 134 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 135 } 136