1 /*********************************************************************
2 * RPC for the Windows NT Operating System
3 * 1993 by Martin F. Gergeleit
4 * Users may use, copy or modify Sun RPC for the Windows NT Operating
5 * System according to the Sun copyright below.
7 * RPC for the Windows NT Operating System COMES WITH ABSOLUTELY NO
8 * WARRANTY, NOR WILL I BE LIABLE FOR ANY DAMAGES INCURRED FROM THE
9 * USE OF. USE ENTIRELY AT YOUR OWN RISK!!!
10 *********************************************************************/
12 /* @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC */
14 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
15 * unrestricted use provided that this legend is included on all tape
16 * media and as a part of the software program in whole or part. Users
17 * may copy or modify Sun RPC without charge, but are not authorized
18 * to license or distribute it to anyone else except as part of a product or
19 * program developed by the user.
21 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
22 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
25 * Sun RPC is provided with no support and without any obligation on the
26 * part of Sun Microsystems, Inc. to assist in its use, correction,
27 * modification or enhancement.
29 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
30 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
31 * OR ANY PART THEREOF.
33 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
34 * or profits or other special, indirect and consequential damages, even if
35 * Sun has been advised of the possibility of such damages.
37 * Sun Microsystems, Inc.
39 * Mountain View, California 94043
41 #if !defined(lint) && defined(SCCSIDS)
42 static char sccsid[] = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
46 * xdr_float.c, Generic XDR routines impelmentation.
48 * Copyright (C) 1984, Sun Microsystems, Inc.
50 * These are the "floating point" xdr routines used to (de)serialize
51 * most common data items. See xdr.h for more info on the interface to
58 #include <rpc/types.h>
63 * This routine works on Suns (Sky / 68000's) and Vaxen.
66 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
67 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
68 defined(__arm__) || defined(__ppc__) || defined(__ia64__) || \
69 defined(__arm26__) || defined(__sparc64__) || defined(__amd64__) || \
70 defined(__sparc) || defined(WIN32)
76 /* What IEEE single precision floating point looks like on a Vax */
78 unsigned int mantissa: 23;
80 unsigned int sign : 1;
83 /* Vax single precision floating point */
85 unsigned int mantissa1 : 7;
87 unsigned int sign : 1;
88 unsigned int mantissa2 : 16;
91 #define VAX_SNG_BIAS 0x81
92 #define IEEE_SNG_BIAS 0x7f
94 static struct sgl_limits {
96 struct ieee_single ieee;
98 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
99 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
100 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
101 { 0x0, 0x0, 0x0 }} /* Min IEEE */
112 struct ieee_single is;
113 struct vax_single vs, *vsp;
114 struct sgl_limits *lim;
117 switch (xdrs->x_op) {
121 return (XDR_PUTLONG(xdrs, (int32_t *)fp));
123 vs = *((struct vax_single *)fp);
124 for (i = 0, lim = sgl_limits;
125 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
127 if ((vs.mantissa2 == lim->s.mantissa2) &&
128 (vs.exp == lim->s.exp) &&
129 (vs.mantissa1 == lim->s.mantissa1)) {
134 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
135 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
138 return (XDR_PUTLONG(xdrs, (long *)&is));
143 return (XDR_GETLONG(xdrs, (int32_t *)fp));
145 vsp = (struct vax_single *)fp;
146 if (!XDR_GETLONG(xdrs, (long *)&is))
148 for (i = 0, lim = sgl_limits;
149 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
151 if ((is.exp == lim->ieee.exp) &&
152 (is.mantissa == lim->ieee.mantissa)) {
157 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
158 vsp->mantissa2 = is.mantissa;
159 vsp->mantissa1 = (is.mantissa >> 16);
172 * This routine works on Suns (Sky / 68000's) and Vaxen.
176 /* What IEEE double precision floating point looks like on a Vax */
178 unsigned int mantissa1 : 20;
179 unsigned int exp : 11;
180 unsigned int sign : 1;
181 unsigned int mantissa2 : 32;
184 /* Vax double precision floating point */
186 unsigned int mantissa1 : 7;
187 unsigned int exp : 8;
188 unsigned int sign : 1;
189 unsigned int mantissa2 : 16;
190 unsigned int mantissa3 : 16;
191 unsigned int mantissa4 : 16;
194 #define VAX_DBL_BIAS 0x81
195 #define IEEE_DBL_BIAS 0x3ff
196 #define MASK(nbits) ((1 << nbits) - 1)
198 static struct dbl_limits {
200 struct ieee_double ieee;
202 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
203 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
204 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
205 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
221 struct ieee_double id;
222 struct vax_double vd;
223 struct dbl_limits *lim;
226 switch (xdrs->x_op) {
230 i32p = (int32_t *)(void *)dp;
231 #if BYTE_ORDER == BIG_ENDIAN
232 rv = XDR_PUTLONG(xdrs, i32p);
235 rv = XDR_PUTLONG(xdrs, i32p+1);
237 rv = XDR_PUTLONG(xdrs, i32p+1);
240 rv = XDR_PUTLONG(xdrs, i32p);
244 vd = *((struct vax_double *)dp);
245 for (i = 0, lim = dbl_limits;
246 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
248 if ((vd.mantissa4 == lim->d.mantissa4) &&
249 (vd.mantissa3 == lim->d.mantissa3) &&
250 (vd.mantissa2 == lim->d.mantissa2) &&
251 (vd.mantissa1 == lim->d.mantissa1) &&
252 (vd.exp == lim->d.exp)) {
257 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
258 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
259 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
260 (vd.mantissa3 << 13) |
261 ((vd.mantissa4 >> 3) & MASK(13));
265 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
269 i32p = (int32_t *)(void *)dp;
270 #if BYTE_ORDER == BIG_ENDIAN
271 rv = XDR_GETLONG(xdrs, i32p);
274 rv = XDR_GETLONG(xdrs, i32p+1);
276 rv = XDR_GETLONG(xdrs, i32p+1);
279 rv = XDR_GETLONG(xdrs, i32p);
284 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
286 for (i = 0, lim = dbl_limits;
287 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
289 if ((id.mantissa2 == lim->ieee.mantissa2) &&
290 (id.mantissa1 == lim->ieee.mantissa1) &&
291 (id.exp == lim->ieee.exp)) {
296 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
297 vd.mantissa1 = (id.mantissa1 >> 13);
298 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
299 (id.mantissa2 >> 29);
300 vd.mantissa3 = (id.mantissa2 >> 13);
301 vd.mantissa4 = (id.mantissa2 << 3);
304 *dp = *((double *)&vd);