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/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 42 #include <rpc/types.h> 43 #include <rpc/xdr.h> 44 45 /* ARGSUSED */ 46 static bool_t 47 x_putlong(XDR *xdrs, const long *longp) 48 { 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, const char *bp, u_int len) 57 { 58 59 xdrs->x_handy += len; 60 return (TRUE); 61 } 62 63 static u_int 64 x_getpostn(XDR *xdrs) 65 { 66 67 return (xdrs->x_handy); 68 } 69 70 /* ARGSUSED */ 71 static bool_t 72 x_setpostn(XDR *xdrs, u_int pos) 73 { 74 75 /* This is not allowed */ 76 return (FALSE); 77 } 78 79 static int32_t * 80 x_inline(XDR *xdrs, u_int len) 81 { 82 83 if (len == 0) { 84 return (NULL); 85 } 86 if (xdrs->x_op != XDR_ENCODE) { 87 return (NULL); 88 } 89 if (len < (u_int)(uintptr_t)xdrs->x_base) { 90 /* x_private was already allocated */ 91 xdrs->x_handy += len; 92 return ((int32_t *) xdrs->x_private); 93 } else { 94 /* Free the earlier space and allocate new area */ 95 if (xdrs->x_private) 96 free(xdrs->x_private, M_RPC); 97 xdrs->x_private = malloc(len, M_RPC, M_WAITOK); 98 xdrs->x_base = (caddr_t)(uintptr_t) len; 99 xdrs->x_handy += len; 100 return ((int32_t *) xdrs->x_private); 101 } 102 } 103 104 static int 105 harmless(void) 106 { 107 108 /* Always return FALSE/NULL, as the case may be */ 109 return (0); 110 } 111 112 static void 113 x_destroy(XDR *xdrs) 114 { 115 116 xdrs->x_handy = 0; 117 xdrs->x_base = 0; 118 if (xdrs->x_private) { 119 free(xdrs->x_private, M_RPC); 120 xdrs->x_private = NULL; 121 } 122 return; 123 } 124 125 unsigned long 126 xdr_sizeof(xdrproc_t func, void *data) 127 { 128 XDR x; 129 struct xdr_ops ops; 130 bool_t stat; 131 /* to stop ANSI-C compiler from complaining */ 132 typedef bool_t (* dummyfunc1)(XDR *, long *); 133 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int); 134 135 ops.x_putlong = x_putlong; 136 ops.x_putbytes = x_putbytes; 137 ops.x_inline = x_inline; 138 ops.x_getpostn = x_getpostn; 139 ops.x_setpostn = x_setpostn; 140 ops.x_destroy = x_destroy; 141 142 /* the other harmless ones */ 143 ops.x_getlong = (dummyfunc1) harmless; 144 ops.x_getbytes = (dummyfunc2) harmless; 145 146 x.x_op = XDR_ENCODE; 147 x.x_ops = &ops; 148 x.x_handy = 0; 149 x.x_private = (caddr_t) NULL; 150 x.x_base = (caddr_t) 0; 151 152 stat = func(&x, data); 153 if (x.x_private) 154 free(x.x_private, M_RPC); 155 return (stat == TRUE ? (unsigned) x.x_handy: 0); 156 } 157