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 * $DragonFly: src/lib/libc/xdr/xdr_sizeof.c,v 1.2 2005/12/05 00:47:57 swildner Exp $ 30 */ 31 32 /* 33 * xdr_sizeof.c 34 * 35 * Copyright 1990 Sun Microsystems, Inc. 36 * 37 * General purpose routine to see how much space something will use 38 * when serialized using XDR. 39 */ 40 41 #include <rpc/types.h> 42 #include <rpc/xdr.h> 43 #include <sys/types.h> 44 #include <stdlib.h> 45 46 /* ARGSUSED */ 47 static bool_t 48 x_putlong(XDR *xdrs, long *longp __unused) 49 { 50 xdrs->x_handy += BYTES_PER_XDR_UNIT; 51 return (TRUE); 52 } 53 54 /* ARGSUSED */ 55 static bool_t 56 x_putbytes(XDR *xdrs, char *bp __unused, u_int len) 57 { 58 xdrs->x_handy += len; 59 return (TRUE); 60 } 61 62 static u_int 63 x_getpostn(XDR *xdrs) 64 { 65 return (xdrs->x_handy); 66 } 67 68 /* ARGSUSED */ 69 static bool_t 70 x_setpostn(XDR *xdrs __unused, u_int pos __unused) 71 { 72 /* This is not allowed */ 73 return (FALSE); 74 } 75 76 static int32_t * 77 x_inline(XDR *xdrs, long len) 78 { 79 if (len == 0) { 80 return (NULL); 81 } 82 if (xdrs->x_op != XDR_ENCODE) { 83 return (NULL); 84 } 85 if (len < (long) xdrs->x_base) { 86 /* x_private was already allocated */ 87 xdrs->x_handy += len; 88 return ((int32_t *) xdrs->x_private); 89 } else { 90 /* Free the earlier space and allocate new area */ 91 if (xdrs->x_private) 92 free(xdrs->x_private); 93 if ((xdrs->x_private = (caddr_t) malloc(len)) == NULL) { 94 xdrs->x_base = 0; 95 return (NULL); 96 } 97 xdrs->x_base = (caddr_t) len; 98 xdrs->x_handy += len; 99 return ((int32_t *) xdrs->x_private); 100 } 101 } 102 103 static int 104 harmless(void) 105 { 106 /* Always return FALSE/NULL, as the case may be */ 107 return (0); 108 } 109 110 static void 111 x_destroy(XDR *xdrs) 112 { 113 xdrs->x_handy = 0; 114 xdrs->x_base = 0; 115 if (xdrs->x_private) { 116 free(xdrs->x_private); 117 xdrs->x_private = NULL; 118 } 119 return; 120 } 121 122 unsigned long 123 xdr_sizeof(xdrproc_t func, void *data) 124 { 125 XDR x; 126 struct xdr_ops ops; 127 bool_t stat; 128 /* to stop ANSI-C compiler from complaining */ 129 typedef bool_t (* dummyfunc1)(XDR *, long *); 130 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int); 131 132 ops.x_putlong = x_putlong; 133 ops.x_putbytes = x_putbytes; 134 ops.x_inline = x_inline; 135 ops.x_getpostn = x_getpostn; 136 ops.x_setpostn = x_setpostn; 137 ops.x_destroy = x_destroy; 138 139 /* the other harmless ones */ 140 ops.x_getlong = (dummyfunc1) harmless; 141 ops.x_getbytes = (dummyfunc2) harmless; 142 143 x.x_op = XDR_ENCODE; 144 x.x_ops = &ops; 145 x.x_handy = 0; 146 x.x_private = (caddr_t) NULL; 147 x.x_base = (caddr_t) 0; 148 149 stat = func(&x, data); 150 if (x.x_private) 151 free(x.x_private); 152 return (stat == TRUE ? (unsigned) x.x_handy: 0); 153 } 154