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
30 #if defined(LIBC_SCCS) && !defined(lint)
31 /*static char *sccsid = "from: @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";*/
32 /*static char *sccsid = "from: @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC";*/
33 static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_float.c,v 1.7 1999/08/28 00:02:55 peter Exp $";
37 * xdr_float.c, Generic XDR routines impelmentation.
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
47 #include <sys/types.h>
48 #include <sys/param.h>
49 #include <rpc/types.h>
54 * This routine works on machines with IEEE754 FP and Vaxen.
57 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
58 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
59 defined(__arm32__) || defined(__ppc__)
60 #include <machine/endian.h>
66 /* What IEEE single precision floating point looks like on a Vax */
68 unsigned int mantissa: 23;
70 unsigned int sign : 1;
73 /* Vax single precision floating point */
75 unsigned int mantissa1 : 7;
77 unsigned int sign : 1;
78 unsigned int mantissa2 : 16;
81 #define VAX_SNG_BIAS 0x81
82 #define IEEE_SNG_BIAS 0x7f
84 static struct sgl_limits {
86 struct ieee_single ieee;
88 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
89 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
90 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
91 { 0x0, 0x0, 0x0 }} /* Min IEEE */
104 struct ieee_single is;
105 struct vax_single vs, *vsp;
106 struct sgl_limits *lim;
109 switch (xdrs->x_op) {
113 tmpl = *(int32_t *)fp;
114 return (XDR_PUTLONG(xdrs, &tmpl));
116 vs = *((struct vax_single *)fp);
117 for (i = 0, lim = sgl_limits;
118 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
120 if ((vs.mantissa2 == lim->s.mantissa2) &&
121 (vs.exp == lim->s.exp) &&
122 (vs.mantissa1 == lim->s.mantissa1)) {
127 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
128 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
131 return (XDR_PUTLONG(xdrs, (long *)&is));
136 rv = XDR_GETLONG(xdrs, &tmpl);
137 *(int32_t *)fp = tmpl;
140 vsp = (struct vax_single *)fp;
141 if (!XDR_GETLONG(xdrs, (long *)&is))
143 for (i = 0, lim = sgl_limits;
144 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
146 if ((is.exp == lim->ieee.exp) &&
147 (is.mantissa == lim->ieee.mantissa)) {
152 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
153 vsp->mantissa2 = is.mantissa;
154 vsp->mantissa1 = (is.mantissa >> 16);
167 /* What IEEE double precision floating point looks like on a Vax */
169 unsigned int mantissa1 : 20;
170 unsigned int exp : 11;
171 unsigned int sign : 1;
172 unsigned int mantissa2 : 32;
175 /* Vax double precision floating point */
177 unsigned int mantissa1 : 7;
178 unsigned int exp : 8;
179 unsigned int sign : 1;
180 unsigned int mantissa2 : 16;
181 unsigned int mantissa3 : 16;
182 unsigned int mantissa4 : 16;
185 #define VAX_DBL_BIAS 0x81
186 #define IEEE_DBL_BIAS 0x3ff
187 #define MASK(nbits) ((1 << nbits) - 1)
189 static struct dbl_limits {
191 struct ieee_double ieee;
193 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
194 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
195 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
196 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
208 register int32_t *i32p;
213 struct ieee_double id;
214 struct vax_double vd;
215 register struct dbl_limits *lim;
219 switch (xdrs->x_op) {
223 i32p = (int32_t *)dp;
224 #if BYTE_ORDER == BIG_ENDIAN
226 rv = XDR_PUTLONG(xdrs, &tmpl);
230 rv = XDR_PUTLONG(xdrs, &tmpl);
233 rv = XDR_PUTLONG(xdrs, &tmpl);
237 rv = XDR_PUTLONG(xdrs, &tmpl);
241 vd = *((struct vax_double *)dp);
242 for (i = 0, lim = dbl_limits;
243 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
245 if ((vd.mantissa4 == lim->d.mantissa4) &&
246 (vd.mantissa3 == lim->d.mantissa3) &&
247 (vd.mantissa2 == lim->d.mantissa2) &&
248 (vd.mantissa1 == lim->d.mantissa1) &&
249 (vd.exp == lim->d.exp)) {
254 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
255 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
256 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
257 (vd.mantissa3 << 13) |
258 ((vd.mantissa4 >> 3) & MASK(13));
262 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
267 i32p = (int32_t *)dp;
268 #if BYTE_ORDER == BIG_ENDIAN
269 rv = XDR_GETLONG(xdrs, &tmpl);
273 rv = XDR_GETLONG(xdrs, &tmpl);
276 rv = XDR_GETLONG(xdrs, &tmpl);
280 rv = XDR_GETLONG(xdrs, &tmpl);
286 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
288 for (i = 0, lim = dbl_limits;
289 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
291 if ((id.mantissa2 == lim->ieee.mantissa2) &&
292 (id.mantissa1 == lim->ieee.mantissa1) &&
293 (id.exp == lim->ieee.exp)) {
298 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
299 vd.mantissa1 = (id.mantissa1 >> 13);
300 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
301 (id.mantissa2 >> 29);
302 vd.mantissa3 = (id.mantissa2 >> 13);
303 vd.mantissa4 = (id.mantissa2 << 3);
306 *dp = *((double *)&vd);