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 * xdr_sizeof.c 31 * 32 * Copyright 1990 Sun Microsystems, Inc. 33 * 34 * General purpose routine to see how much space something will use 35 * when serialized using XDR. 36 */ 37 38 #include <sys/cdefs.h> 39 #if 0 40 __FBSDID("$FreeBSD: src/lib/libc/xdr/xdr_sizeof.c,v 1.5.38.1 2010/12/21 17:10:29 kensmith Exp $"); 41 #else 42 __RCSID("$NetBSD: xdr_sizeof.c,v 1.4 2012/03/20 17:14:50 matt Exp $"); 43 #endif 44 45 #include "namespace.h" 46 #include <rpc/types.h> 47 #include <rpc/xdr.h> 48 #include <sys/types.h> 49 #include <stdlib.h> 50 51 #ifdef __weak_alias 52 __weak_alias(xdr_sizeof,_xdr_sizeof) 53 #endif 54 55 static bool_t x_putlong(XDR *, const long *); 56 static bool_t x_putbytes(XDR *, const char *, u_int); 57 static u_int x_getpostn(XDR *); 58 static bool_t x_setpostn(XDR *, u_int); 59 static int32_t *x_inline(XDR *, u_int); 60 static int harmless(void); 61 static void x_destroy(XDR *); 62 63 /* ARGSUSED */ 64 static bool_t 65 x_putlong(XDR *xdrs, const long *longp) 66 { 67 xdrs->x_handy += BYTES_PER_XDR_UNIT; 68 return (TRUE); 69 } 70 71 /* ARGSUSED */ 72 static bool_t 73 x_putbytes(XDR *xdrs, const char *bp, u_int len) 74 { 75 xdrs->x_handy += len; 76 return (TRUE); 77 } 78 79 static u_int 80 x_getpostn(XDR *xdrs) 81 { 82 return (xdrs->x_handy); 83 } 84 85 /* ARGSUSED */ 86 static bool_t 87 x_setpostn(XDR *xdrs, u_int pos) 88 { 89 /* This is not allowed */ 90 return (FALSE); 91 } 92 93 static int32_t * 94 x_inline(XDR *xdrs, u_int len) 95 { 96 if (len == 0) { 97 return (NULL); 98 } 99 if (xdrs->x_op != XDR_ENCODE) { 100 return (NULL); 101 } 102 if (len < (u_int)(uintptr_t)xdrs->x_base) { 103 /* x_private was already allocated */ 104 xdrs->x_handy += len; 105 return ((int32_t *) xdrs->x_private); 106 } else { 107 /* Free the earlier space and allocate new area */ 108 if (xdrs->x_private) 109 free(xdrs->x_private); 110 if ((xdrs->x_private = malloc(len)) == NULL) { 111 xdrs->x_base = 0; 112 return (NULL); 113 } 114 xdrs->x_base = (caddr_t)(uintptr_t)len; 115 xdrs->x_handy += len; 116 return ((int32_t *) xdrs->x_private); 117 } 118 } 119 120 static int 121 harmless(void) 122 { 123 /* Always return FALSE/NULL, as the case may be */ 124 return (0); 125 } 126 127 static void 128 x_destroy(XDR *xdrs) 129 { 130 xdrs->x_handy = 0; 131 xdrs->x_base = 0; 132 if (xdrs->x_private) { 133 free(xdrs->x_private); 134 xdrs->x_private = NULL; 135 } 136 return; 137 } 138 139 unsigned long 140 xdr_sizeof(xdrproc_t func, void *data) 141 { 142 XDR x; 143 struct xdr_ops ops; 144 bool_t stat; 145 /* to stop ANSI-C compiler from complaining */ 146 typedef bool_t (* dummyfunc1)(XDR *, long *); 147 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int); 148 149 ops.x_putlong = x_putlong; 150 ops.x_putbytes = x_putbytes; 151 ops.x_inline = x_inline; 152 ops.x_getpostn = x_getpostn; 153 ops.x_setpostn = x_setpostn; 154 ops.x_destroy = x_destroy; 155 156 /* the other harmless ones */ 157 ops.x_getlong = (dummyfunc1) harmless; 158 ops.x_getbytes = (dummyfunc2) harmless; 159 160 x.x_op = XDR_ENCODE; 161 x.x_ops = &ops; 162 x.x_handy = 0; 163 x.x_private = (caddr_t) NULL; 164 x.x_base = (caddr_t) 0; 165 166 stat = func(&x, data); 167 if (x.x_private) 168 free(x.x_private); 169 return (stat == TRUE ? (unsigned) x.x_handy: 0); 170 } 171