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 #include <sys/cdefs.h> 33 /* 34 * xdr_reference.c, Generic XDR routines implementation. 35 * 36 * Copyright (C) 1987, Sun Microsystems, Inc. 37 * 38 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 39 * "pointers". See xdr.h for more info on the interface to xdr. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/malloc.h> 45 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 printf("xdr_reference: out of memory"); 76 return (FALSE); 77 } 78 memset(loc, 0, size); 79 break; 80 81 case XDR_ENCODE: 82 break; 83 } 84 85 stat = (*proc)(xdrs, loc); 86 87 if (xdrs->x_op == XDR_FREE) { 88 mem_free(loc, size); 89 *pp = NULL; 90 } 91 return (stat); 92 } 93 94 /* 95 * xdr_pointer(): 96 * 97 * XDR a pointer to a possibly recursive data structure. This 98 * differs with xdr_reference in that it can serialize/deserialiaze 99 * trees correctly. 100 * 101 * What's sent is actually a union: 102 * 103 * union object_pointer switch (boolean b) { 104 * case TRUE: object_data data; 105 * case FALSE: void nothing; 106 * } 107 * 108 * > objpp: Pointer to the pointer to the object. 109 * > obj_size: size of the object. 110 * > xdr_obj: routine to XDR an object. 111 * 112 */ 113 bool_t 114 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj) 115 { 116 117 bool_t more_data; 118 119 more_data = (*objpp != NULL); 120 if (! xdr_bool(xdrs,&more_data)) { 121 return (FALSE); 122 } 123 if (! more_data) { 124 *objpp = NULL; 125 return (TRUE); 126 } 127 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 128 } 129