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 *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/ 32 /*static char *sccsid = "from: @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC";*/ 33 static char *rcsid = "$Id: xdr_reference.c,v 1.1 1993/10/27 05:41:13 paul Exp $"; 34 #endif 35 36 /* 37 * xdr_reference.c, Generic XDR routines impelmentation. 38 * 39 * Copyright (C) 1987, Sun Microsystems, Inc. 40 * 41 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 42 * "pointers". See xdr.h for more info on the interface to xdr. 43 */ 44 45 #include <stdio.h> 46 #include <rpc/types.h> 47 #include <rpc/xdr.h> 48 49 #define LASTUNSIGNED ((u_int)0-1) 50 51 /* 52 * XDR an indirect pointer 53 * xdr_reference is for recursively translating a structure that is 54 * referenced by a pointer inside the structure that is currently being 55 * translated. pp references a pointer to storage. If *pp is null 56 * the necessary storage is allocated. 57 * size is the sizeof the referneced structure. 58 * proc is the routine to handle the referenced structure. 59 */ 60 bool_t 61 xdr_reference(xdrs, pp, size, proc) 62 register XDR *xdrs; 63 caddr_t *pp; /* the pointer to work on */ 64 u_int size; /* size of the object pointed to */ 65 xdrproc_t proc; /* xdr routine to handle the object */ 66 { 67 register caddr_t loc = *pp; 68 register bool_t stat; 69 70 if (loc == NULL) 71 switch (xdrs->x_op) { 72 case XDR_FREE: 73 return (TRUE); 74 75 case XDR_DECODE: 76 *pp = loc = (caddr_t) mem_alloc(size); 77 if (loc == NULL) { 78 (void) fprintf(stderr, 79 "xdr_reference: out of memory\n"); 80 return (FALSE); 81 } 82 bzero(loc, (int)size); 83 break; 84 } 85 86 stat = (*proc)(xdrs, loc, LASTUNSIGNED); 87 88 if (xdrs->x_op == XDR_FREE) { 89 mem_free(loc, size); 90 *pp = NULL; 91 } 92 return (stat); 93 } 94 95 96 /* 97 * xdr_pointer(): 98 * 99 * XDR a pointer to a possibly recursive data structure. This 100 * differs with xdr_reference in that it can serialize/deserialiaze 101 * trees correctly. 102 * 103 * What's sent is actually a union: 104 * 105 * union object_pointer switch (boolean b) { 106 * case TRUE: object_data data; 107 * case FALSE: void nothing; 108 * } 109 * 110 * > objpp: Pointer to the pointer to the object. 111 * > obj_size: size of the object. 112 * > xdr_obj: routine to XDR an object. 113 * 114 */ 115 bool_t 116 xdr_pointer(xdrs,objpp,obj_size,xdr_obj) 117 register XDR *xdrs; 118 char **objpp; 119 u_int obj_size; 120 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