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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 $
36 * xdr_float.c, Generic XDR routines implementation.
38 * Copyright (C) 1984, Sun Microsystems, Inc.
40 * These are the "floating point" xdr routines used to (de)serialize
41 * most common data items. See xdr.h for more info on the interface to
45 #include "namespace.h"
46 #include <sys/types.h>
47 #include <sys/param.h>
51 #include <rpc/types.h>
53 #include "un-namespace.h"
57 * This routine works on machines with IEEE754 FP and Vaxen.
60 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
61 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
62 defined(__arm__) || defined(__ppc__) || defined(__ia64__) || \
63 defined(__arm26__) || defined(__sparc64__) || defined(__x86_64__)
64 #include <machine/endian.h>
70 /* What IEEE single precision floating point looks like on a Vax */
72 unsigned int mantissa: 23;
74 unsigned int sign : 1;
77 /* Vax single precision floating point */
79 unsigned int mantissa1 : 7;
81 unsigned int sign : 1;
82 unsigned int mantissa2 : 16;
85 #define VAX_SNG_BIAS 0x81
86 #define IEEE_SNG_BIAS 0x7f
88 static struct sgl_limits {
90 struct ieee_single ieee;
92 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
93 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
94 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
95 { 0x0, 0x0, 0x0 }} /* Min IEEE */
100 xdr_float(XDR *xdrs, float *fp)
103 struct ieee_single is;
104 struct vax_single vs, *vsp;
105 struct sgl_limits *lim;
108 switch (xdrs->x_op) {
112 return (XDR_PUTINT32(xdrs, (int32_t *)fp));
114 vs = *((struct vax_single *)fp);
115 for (i = 0, lim = sgl_limits;
116 i < NELEM(sgl_limits);
118 if ((vs.mantissa2 == lim->s.mantissa2) &&
119 (vs.exp == lim->s.exp) &&
120 (vs.mantissa1 == lim->s.mantissa1)) {
125 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
126 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
129 return (XDR_PUTINT32(xdrs, (int32_t *)&is));
134 return (XDR_GETINT32(xdrs, (int32_t *)fp));
136 vsp = (struct vax_single *)fp;
137 if (!XDR_GETINT32(xdrs, (int32_t *)&is))
139 for (i = 0, lim = sgl_limits;
140 i < NELEM(sgl_limits);
142 if ((is.exp == lim->ieee.exp) &&
143 (is.mantissa == lim->ieee.mantissa)) {
148 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
149 vsp->mantissa2 = is.mantissa;
150 vsp->mantissa1 = (is.mantissa >> 16);
164 /* What IEEE double precision floating point looks like on a Vax */
166 unsigned int mantissa1 : 20;
167 unsigned int exp : 11;
168 unsigned int sign : 1;
169 unsigned int mantissa2 : 32;
172 /* Vax double precision floating point */
174 unsigned int mantissa1 : 7;
175 unsigned int exp : 8;
176 unsigned int sign : 1;
177 unsigned int mantissa2 : 16;
178 unsigned int mantissa3 : 16;
179 unsigned int mantissa4 : 16;
182 #define VAX_DBL_BIAS 0x81
183 #define IEEE_DBL_BIAS 0x3ff
184 #define MASK(nbits) ((1 << nbits) - 1)
186 static struct dbl_limits {
188 struct ieee_double ieee;
190 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
191 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
192 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
193 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
200 xdr_double(XDR *xdrs, double *dp)
207 struct ieee_double id;
208 struct vax_double vd;
209 struct dbl_limits *lim;
213 switch (xdrs->x_op) {
217 i32p = (int32_t *)(void *)dp;
218 #if BYTE_ORDER == BIG_ENDIAN
219 rv = XDR_PUTINT32(xdrs, i32p);
222 rv = XDR_PUTINT32(xdrs, i32p+1);
224 rv = XDR_PUTINT32(xdrs, i32p+1);
227 rv = XDR_PUTINT32(xdrs, i32p);
231 vd = *((struct vax_double *)dp);
232 for (i = 0, lim = dbl_limits;
233 i < NELEM(dbl_limits);
235 if ((vd.mantissa4 == lim->d.mantissa4) &&
236 (vd.mantissa3 == lim->d.mantissa3) &&
237 (vd.mantissa2 == lim->d.mantissa2) &&
238 (vd.mantissa1 == lim->d.mantissa1) &&
239 (vd.exp == lim->d.exp)) {
244 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
245 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
246 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
247 (vd.mantissa3 << 13) |
248 ((vd.mantissa4 >> 3) & MASK(13));
252 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
257 i32p = (int32_t *)(void *)dp;
258 #if BYTE_ORDER == BIG_ENDIAN
259 rv = XDR_GETINT32(xdrs, i32p);
262 rv = XDR_GETINT32(xdrs, i32p+1);
264 rv = XDR_GETINT32(xdrs, i32p+1);
267 rv = XDR_GETINT32(xdrs, i32p);
272 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
274 for (i = 0, lim = dbl_limits;
275 i < NELEM(dbl_limits);
277 if ((id.mantissa2 == lim->ieee.mantissa2) &&
278 (id.mantissa1 == lim->ieee.mantissa1) &&
279 (id.exp == lim->ieee.exp)) {
284 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
285 vd.mantissa1 = (id.mantissa1 >> 13);
286 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
287 (id.mantissa2 >> 29);
288 vd.mantissa3 = (id.mantissa2 >> 13);
289 vd.mantissa4 = (id.mantissa2 << 3);
292 *dp = *((double *)&vd);