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.
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.
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.
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.
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.
25 * Sun Microsystems, Inc.
27 * Mountain View, California 94043
29 * @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro
30 * @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC
31 * $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt Exp $
32 * $FreeBSD: src/lib/libc/xdr/xdr_float.c,v 1.14 2004/10/16 06:32:43 obrien Exp $
33 * $DragonFly: src/lib/libc/xdr/xdr_float.c,v 1.6 2006/07/27 00:43:17 corecode Exp $
37 * xdr_float.c, Generic XDR routines implementation.
39 * Copyright (C) 1984, Sun Microsystems, Inc.
41 * These are the "floating point" xdr routines used to (de)serialize
42 * most common data items. See xdr.h for more info on the interface to
46 #include "namespace.h"
47 #include <sys/types.h>
48 #include <sys/param.h>
52 #include <rpc/types.h>
54 #include "un-namespace.h"
58 * This routine works on machines with IEEE754 FP and Vaxen.
61 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
62 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
63 defined(__arm__) || defined(__ppc__) || defined(__ia64__) || \
64 defined(__arm26__) || defined(__sparc64__) || defined(__x86_64__)
65 #include <machine/endian.h>
71 /* What IEEE single precision floating point looks like on a Vax */
73 unsigned int mantissa: 23;
75 unsigned int sign : 1;
78 /* Vax single precision floating point */
80 unsigned int mantissa1 : 7;
82 unsigned int sign : 1;
83 unsigned int mantissa2 : 16;
86 #define VAX_SNG_BIAS 0x81
87 #define IEEE_SNG_BIAS 0x7f
89 static struct sgl_limits {
91 struct ieee_single ieee;
93 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
94 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
95 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
96 { 0x0, 0x0, 0x0 }} /* Min IEEE */
101 xdr_float(XDR *xdrs, float *fp)
104 struct ieee_single is;
105 struct vax_single vs, *vsp;
106 struct sgl_limits *lim;
109 switch (xdrs->x_op) {
113 return (XDR_PUTINT32(xdrs, (int32_t *)fp));
115 vs = *((struct vax_single *)fp);
116 for (i = 0, lim = sgl_limits;
117 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
119 if ((vs.mantissa2 == lim->s.mantissa2) &&
120 (vs.exp == lim->s.exp) &&
121 (vs.mantissa1 == lim->s.mantissa1)) {
126 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
127 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
130 return (XDR_PUTINT32(xdrs, (int32_t *)&is));
135 return (XDR_GETINT32(xdrs, (int32_t *)fp));
137 vsp = (struct vax_single *)fp;
138 if (!XDR_GETINT32(xdrs, (int32_t *)&is))
140 for (i = 0, lim = sgl_limits;
141 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
143 if ((is.exp == lim->ieee.exp) &&
144 (is.mantissa == lim->ieee.mantissa)) {
149 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
150 vsp->mantissa2 = is.mantissa;
151 vsp->mantissa1 = (is.mantissa >> 16);
165 /* What IEEE double precision floating point looks like on a Vax */
167 unsigned int mantissa1 : 20;
168 unsigned int exp : 11;
169 unsigned int sign : 1;
170 unsigned int mantissa2 : 32;
173 /* Vax double precision floating point */
175 unsigned int mantissa1 : 7;
176 unsigned int exp : 8;
177 unsigned int sign : 1;
178 unsigned int mantissa2 : 16;
179 unsigned int mantissa3 : 16;
180 unsigned int mantissa4 : 16;
183 #define VAX_DBL_BIAS 0x81
184 #define IEEE_DBL_BIAS 0x3ff
185 #define MASK(nbits) ((1 << nbits) - 1)
187 static struct dbl_limits {
189 struct ieee_double ieee;
191 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
192 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
193 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
194 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
201 xdr_double(XDR *xdrs, double *dp)
208 struct ieee_double id;
209 struct vax_double vd;
210 struct dbl_limits *lim;
214 switch (xdrs->x_op) {
218 i32p = (int32_t *)(void *)dp;
219 #if BYTE_ORDER == BIG_ENDIAN
220 rv = XDR_PUTINT32(xdrs, i32p);
223 rv = XDR_PUTINT32(xdrs, i32p+1);
225 rv = XDR_PUTINT32(xdrs, i32p+1);
228 rv = XDR_PUTINT32(xdrs, i32p);
232 vd = *((struct vax_double *)dp);
233 for (i = 0, lim = dbl_limits;
234 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
236 if ((vd.mantissa4 == lim->d.mantissa4) &&
237 (vd.mantissa3 == lim->d.mantissa3) &&
238 (vd.mantissa2 == lim->d.mantissa2) &&
239 (vd.mantissa1 == lim->d.mantissa1) &&
240 (vd.exp == lim->d.exp)) {
245 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
246 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
247 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
248 (vd.mantissa3 << 13) |
249 ((vd.mantissa4 >> 3) & MASK(13));
253 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
258 i32p = (int32_t *)(void *)dp;
259 #if BYTE_ORDER == BIG_ENDIAN
260 rv = XDR_GETINT32(xdrs, i32p);
263 rv = XDR_GETINT32(xdrs, i32p+1);
265 rv = XDR_GETINT32(xdrs, i32p+1);
268 rv = XDR_GETINT32(xdrs, i32p);
273 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
275 for (i = 0, lim = dbl_limits;
276 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
278 if ((id.mantissa2 == lim->ieee.mantissa2) &&
279 (id.mantissa1 == lim->ieee.mantissa1) &&
280 (id.exp == lim->ieee.exp)) {
285 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
286 vd.mantissa1 = (id.mantissa1 >> 13);
287 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
288 (id.mantissa2 >> 29);
289 vd.mantissa3 = (id.mantissa2 >> 13);
290 vd.mantissa4 = (id.mantissa2 << 3);
293 *dp = *((double *)&vd);