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 = "$FreeBSD$"; 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 <stdlib.h> 47 #include <string.h> 48 #include <rpc/types.h> 49 #include <rpc/xdr.h> 50 51 #define LASTUNSIGNED ((u_int) 0-1) 52 53 /* 54 * XDR an indirect pointer 55 * xdr_reference is for recursively translating a structure that is 56 * referenced by a pointer inside the structure that is currently being 57 * translated. pp references a pointer to storage. If *pp is null 58 * the necessary storage is allocated. 59 * size is the sizeof the referneced structure. 60 * proc is the routine to handle the referenced structure. 61 */ 62 bool_t 63 xdr_reference(xdrs, pp, size, proc) 64 register XDR *xdrs; 65 caddr_t *pp; /* the pointer to work on */ 66 u_int size; /* size of the object pointed to */ 67 xdrproc_t proc; /* xdr routine to handle the object */ 68 { 69 register caddr_t loc = *pp; 70 register bool_t stat; 71 72 if (loc == NULL) 73 switch (xdrs->x_op) { 74 case XDR_FREE: 75 return (TRUE); 76 77 case XDR_DECODE: 78 *pp = loc = (caddr_t) mem_alloc(size); 79 if (loc == NULL) { 80 (void) fprintf(stderr, 81 "xdr_reference: out of memory\n"); 82 return (FALSE); 83 } 84 memset(loc, 0, (int)size); 85 break; 86 } 87 88 stat = (*proc)(xdrs, loc, LASTUNSIGNED); 89 90 if (xdrs->x_op == XDR_FREE) { 91 mem_free(loc, size); 92 *pp = NULL; 93 } 94 return (stat); 95 } 96 97 98 /* 99 * xdr_pointer(): 100 * 101 * XDR a pointer to a possibly recursive data structure. This 102 * differs with xdr_reference in that it can serialize/deserialiaze 103 * trees correctly. 104 * 105 * What's sent is actually a union: 106 * 107 * union object_pointer switch (boolean b) { 108 * case TRUE: object_data data; 109 * case FALSE: void nothing; 110 * } 111 * 112 * > objpp: Pointer to the pointer to the object. 113 * > obj_size: size of the object. 114 * > xdr_obj: routine to XDR an object. 115 * 116 */ 117 bool_t 118 xdr_pointer(xdrs,objpp,obj_size,xdr_obj) 119 register XDR *xdrs; 120 char **objpp; 121 u_int obj_size; 122 xdrproc_t xdr_obj; 123 { 124 125 bool_t more_data; 126 127 more_data = (*objpp != NULL); 128 if (! xdr_bool(xdrs,&more_data)) { 129 return (FALSE); 130 } 131 if (! more_data) { 132 *objpp = NULL; 133 return (TRUE); 134 } 135 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 136 } 137