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_array.c,v 1.6 2002/08/01 01:05:24 deraadt Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 /* 35 * xdr_array.c, Generic XDR routines impelmentation. 36 * 37 * Copyright (C) 1984, Sun Microsystems, Inc. 38 * 39 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 40 * arrays. See xdr.h for more info on the interface to xdr. 41 */ 42 43 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <limits.h> 49 #include <rpc/types.h> 50 #include <rpc/xdr.h> 51 52 /* 53 * XDR an array of arbitrary elements 54 * *addrp is a pointer to the array, *sizep is the number of elements. 55 * If addrp is NULL (*sizep * elsize) bytes are allocated. 56 * elsize is the size (in bytes) of each element, and elproc is the 57 * xdr procedure to call to handle each element of the array. 58 */ 59 bool_t 60 xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc) 61 XDR *xdrs; 62 caddr_t *addrp; /* array pointer */ 63 u_int *sizep; /* number of elements */ 64 u_int maxsize; /* max numberof elements */ 65 u_int elsize; /* size in bytes of each element */ 66 xdrproc_t elproc; /* xdr routine to handle each element */ 67 { 68 caddr_t target = *addrp; 69 u_int nodesize, c, i; 70 bool_t stat = TRUE; 71 72 /* like strings, arrays are really counted arrays */ 73 if (!xdr_u_int(xdrs, sizep)) 74 return (FALSE); 75 76 c = *sizep; 77 if ((c > maxsize || c > UINT_MAX/elsize) && 78 xdrs->x_op != XDR_FREE) 79 return (FALSE); 80 nodesize = c * elsize; 81 82 /* 83 * if we are deserializing, we may need to allocate an array. 84 * We also save time by checking for a null array if we are freeing. 85 */ 86 if (target == NULL) { 87 switch (xdrs->x_op) { 88 case XDR_DECODE: 89 if (c == 0) 90 return (TRUE); 91 *addrp = target = mem_alloc(nodesize); 92 if (target == NULL) { 93 (void) fprintf(stderr, 94 "xdr_array: out of memory\n"); 95 return (FALSE); 96 } 97 memset(target, 0, nodesize); 98 break; 99 case XDR_FREE: 100 return (TRUE); 101 } 102 } 103 104 /* 105 * now we xdr each element of array 106 */ 107 for (i = 0; (i < c) && stat; i++) { 108 stat = (*elproc)(xdrs, target); 109 target += elsize; 110 } 111 112 /* 113 * the array may need freeing 114 */ 115 if (xdrs->x_op == XDR_FREE) { 116 mem_free(*addrp, nodesize); 117 *addrp = NULL; 118 } 119 return (stat); 120 } 121 122 /* 123 * xdr_vector(): 124 * 125 * XDR a fixed length array. Unlike variable-length arrays, 126 * the storage of fixed length arrays is static and unfreeable. 127 * > basep: base of the array 128 * > size: size of the array 129 * > elemsize: size of each element 130 * > xdr_elem: routine to XDR each element 131 */ 132 bool_t 133 xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem) 134 XDR *xdrs; 135 char *basep; 136 u_int nelem; 137 u_int elemsize; 138 xdrproc_t xdr_elem; 139 { 140 char *elptr; 141 u_int i; 142 143 elptr = basep; 144 for (i = 0; i < nelem; i++) { 145 if (!(*xdr_elem)(xdrs, elptr)) 146 return(FALSE); 147 elptr += elemsize; 148 } 149 return(TRUE); 150 } 151