Bring in a transport-independent RPC (TI-RPC).
[dragonfly.git] / lib / libc / xdr / xdr_float.c
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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
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28 *
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
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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 $
7f23b8ef 33 * $DragonFly: src/lib/libc/xdr/xdr_float.c,v 1.6 2006/07/27 00:43:17 corecode Exp $
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34 */
35
984263bc 36/*
ce0e08e2 37 * xdr_float.c, Generic XDR routines implementation.
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38 *
39 * Copyright (C) 1984, Sun Microsystems, Inc.
40 *
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
43 * xdr.
44 */
45
ce0e08e2 46#include "namespace.h"
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47#include <sys/types.h>
48#include <sys/param.h>
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49
50#include <stdio.h>
51
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52#include <rpc/types.h>
53#include <rpc/xdr.h>
ce0e08e2 54#include "un-namespace.h"
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55
56/*
57 * NB: Not portable.
58 * This routine works on machines with IEEE754 FP and Vaxen.
59 */
60
61#if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
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62 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
63 defined(__arm__) || defined(__ppc__) || defined(__ia64__) || \
64 defined(__arm26__) || defined(__sparc64__) || defined(__amd64__)
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65#include <machine/endian.h>
66#define IEEEFP
67#endif
68
ce0e08e2 69#if defined(__vax__)
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70
71/* What IEEE single precision floating point looks like on a Vax */
72struct ieee_single {
73 unsigned int mantissa: 23;
74 unsigned int exp : 8;
75 unsigned int sign : 1;
76};
77
78/* Vax single precision floating point */
79struct vax_single {
80 unsigned int mantissa1 : 7;
81 unsigned int exp : 8;
82 unsigned int sign : 1;
83 unsigned int mantissa2 : 16;
84};
85
86#define VAX_SNG_BIAS 0x81
87#define IEEE_SNG_BIAS 0x7f
88
89static struct sgl_limits {
90 struct vax_single s;
91 struct ieee_single ieee;
92} sgl_limits[2] = {
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 */
97};
98#endif /* vax */
99
100bool_t
61e06046 101xdr_float(XDR *xdrs, float *fp)
984263bc 102{
ce0e08e2 103#ifndef IEEEFP
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104 struct ieee_single is;
105 struct vax_single vs, *vsp;
106 struct sgl_limits *lim;
107 int i;
108#endif
109 switch (xdrs->x_op) {
110
111 case XDR_ENCODE:
112#ifdef IEEEFP
ce0e08e2 113 return (XDR_PUTINT32(xdrs, (int32_t *)fp));
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114#else
115 vs = *((struct vax_single *)fp);
116 for (i = 0, lim = sgl_limits;
117 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
118 i++, lim++) {
119 if ((vs.mantissa2 == lim->s.mantissa2) &&
120 (vs.exp == lim->s.exp) &&
121 (vs.mantissa1 == lim->s.mantissa1)) {
122 is = lim->ieee;
123 goto shipit;
124 }
125 }
126 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
127 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
128 shipit:
129 is.sign = vs.sign;
ce0e08e2 130 return (XDR_PUTINT32(xdrs, (int32_t *)&is));
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131#endif
132
133 case XDR_DECODE:
134#ifdef IEEEFP
ce0e08e2 135 return (XDR_GETINT32(xdrs, (int32_t *)fp));
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136#else
137 vsp = (struct vax_single *)fp;
ce0e08e2 138 if (!XDR_GETINT32(xdrs, (int32_t *)&is))
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139 return (FALSE);
140 for (i = 0, lim = sgl_limits;
141 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
142 i++, lim++) {
143 if ((is.exp == lim->ieee.exp) &&
144 (is.mantissa == lim->ieee.mantissa)) {
145 *vsp = lim->s;
146 goto doneit;
147 }
148 }
149 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
150 vsp->mantissa2 = is.mantissa;
151 vsp->mantissa1 = (is.mantissa >> 16);
152 doneit:
153 vsp->sign = is.sign;
154 return (TRUE);
155#endif
156
157 case XDR_FREE:
158 return (TRUE);
159 }
ce0e08e2 160 /* NOTREACHED */
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161 return (FALSE);
162}
163
ce0e08e2 164#if defined(__vax__)
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165/* What IEEE double precision floating point looks like on a Vax */
166struct ieee_double {
167 unsigned int mantissa1 : 20;
168 unsigned int exp : 11;
169 unsigned int sign : 1;
170 unsigned int mantissa2 : 32;
171};
172
173/* Vax double precision floating point */
174struct vax_double {
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;
181};
182
183#define VAX_DBL_BIAS 0x81
184#define IEEE_DBL_BIAS 0x3ff
185#define MASK(nbits) ((1 << nbits) - 1)
186
187static struct dbl_limits {
188 struct vax_double d;
189 struct ieee_double ieee;
190} dbl_limits[2] = {
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 */
195};
196
197#endif /* vax */
198
199
200bool_t
61e06046 201xdr_double(XDR *xdrs, double *dp)
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202{
203#ifdef IEEEFP
660c873b 204 int32_t *i32p;
984263bc 205 bool_t rv;
984263bc 206#else
ce0e08e2 207 int32_t *lp;
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208 struct ieee_double id;
209 struct vax_double vd;
660c873b 210 struct dbl_limits *lim;
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211 int i;
212#endif
213
214 switch (xdrs->x_op) {
215
216 case XDR_ENCODE:
217#ifdef IEEEFP
ce0e08e2 218 i32p = (int32_t *)(void *)dp;
984263bc 219#if BYTE_ORDER == BIG_ENDIAN
ce0e08e2 220 rv = XDR_PUTINT32(xdrs, i32p);
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221 if (!rv)
222 return (rv);
ce0e08e2 223 rv = XDR_PUTINT32(xdrs, i32p+1);
984263bc 224#else
ce0e08e2 225 rv = XDR_PUTINT32(xdrs, i32p+1);
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226 if (!rv)
227 return (rv);
ce0e08e2 228 rv = XDR_PUTINT32(xdrs, i32p);
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229#endif
230 return (rv);
231#else
232 vd = *((struct vax_double *)dp);
233 for (i = 0, lim = dbl_limits;
234 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
235 i++, lim++) {
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)) {
241 id = lim->ieee;
242 goto shipit;
243 }
244 }
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));
250 shipit:
251 id.sign = vd.sign;
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252 lp = (int32_t *)&id;
253 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
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254#endif
255
256 case XDR_DECODE:
257#ifdef IEEEFP
ce0e08e2 258 i32p = (int32_t *)(void *)dp;
984263bc 259#if BYTE_ORDER == BIG_ENDIAN
ce0e08e2 260 rv = XDR_GETINT32(xdrs, i32p);
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261 if (!rv)
262 return (rv);
ce0e08e2 263 rv = XDR_GETINT32(xdrs, i32p+1);
984263bc 264#else
ce0e08e2 265 rv = XDR_GETINT32(xdrs, i32p+1);
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266 if (!rv)
267 return (rv);
ce0e08e2 268 rv = XDR_GETINT32(xdrs, i32p);
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269#endif
270 return (rv);
271#else
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272 lp = (int32_t *)&id;
273 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
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274 return (FALSE);
275 for (i = 0, lim = dbl_limits;
276 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
277 i++, lim++) {
278 if ((id.mantissa2 == lim->ieee.mantissa2) &&
279 (id.mantissa1 == lim->ieee.mantissa1) &&
280 (id.exp == lim->ieee.exp)) {
281 vd = lim->d;
282 goto doneit;
283 }
284 }
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);
291 doneit:
292 vd.sign = id.sign;
293 *dp = *((double *)&vd);
294 return (TRUE);
295#endif
296
297 case XDR_FREE:
298 return (TRUE);
299 }
ce0e08e2 300 /* NOTREACHED */
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301 return (FALSE);
302}