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19 * OR ANY PART THEREOF.
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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(__amd64__)
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
);