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
57 #include <rpc/types.h>
62 * This routine works on Suns (Sky / 68000's) and Vaxen.
67 /* What IEEE single precision floating point looks like on a Vax */
69 unsigned int mantissa: 23;
71 unsigned int sign : 1;
74 /* Vax single precision floating point */
76 unsigned int mantissa1 : 7;
78 unsigned int sign : 1;
79 unsigned int mantissa2 : 16;
82 #define VAX_SNG_BIAS 0x81
83 #define IEEE_SNG_BIAS 0x7f
85 static struct sgl_limits {
87 struct ieee_single ieee;
89 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
90 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
91 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
92 { 0x0, 0x0, 0x0 }} /* Min IEEE */
104 /*Motorola PowerPC is same endian for NT as Intel so...*/
109 /*also DEC ALPHA is same endian for NT as Intel so...*/
114 #if !defined(mc68000) && !defined(sparc) && !defined(mips) && !defined(mmax) && !defined(_X86_)
115 struct ieee_single is;
116 struct vax_single vs, *vsp;
117 struct sgl_limits *lim;
120 switch (xdrs->x_op) {
123 #if defined(mc68000) || defined(sparc) || defined(mips) || defined(mmax) || defined(_X86_)
124 return (XDR_PUTLONG(xdrs, (long *)fp));
126 vs = *((struct vax_single *)fp);
127 for (i = 0, lim = sgl_limits;
128 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
130 if ((vs.mantissa2 == lim->s.mantissa2) &&
131 (vs.exp == lim->s.exp) &&
132 (vs.mantissa1 == lim->s.mantissa1)) {
137 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
138 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
141 return (XDR_PUTLONG(xdrs, (long *)&is));
145 #if defined(mc68000) || defined(sparc) || defined(mips) || defined(mmax) || defined(_X86_)
146 return (XDR_GETLONG(xdrs, (long *)fp));
148 vsp = (struct vax_single *)fp;
149 if (!XDR_GETLONG(xdrs, (long *)&is))
151 for (i = 0, lim = sgl_limits;
152 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
154 if ((is.exp == lim->ieee.exp) &&
155 (is.mantissa == lim->ieee.mantissa)) {
160 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
161 vsp->mantissa2 = is.mantissa;
162 vsp->mantissa1 = (is.mantissa >> 16);
175 * This routine works on Suns (Sky / 68000's) and Vaxen.
179 /* What IEEE double precision floating point looks like on a Vax */
181 unsigned int mantissa1 : 20;
182 unsigned int exp : 11;
183 unsigned int sign : 1;
184 unsigned int mantissa2 : 32;
187 /* Vax double precision floating point */
189 unsigned int mantissa1 : 7;
190 unsigned int exp : 8;
191 unsigned int sign : 1;
192 unsigned int mantissa2 : 16;
193 unsigned int mantissa3 : 16;
194 unsigned int mantissa4 : 16;
197 #define VAX_DBL_BIAS 0x81
198 #define IEEE_DBL_BIAS 0x3ff
199 #define MASK(nbits) ((1 << nbits) - 1)
201 static struct dbl_limits {
203 struct ieee_double ieee;
205 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
206 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
207 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
208 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
220 #if !defined(mc68000) && !defined(sparc) && !defined(mips) && !defined(mmax) && !defined(_X86_)
221 struct ieee_double id;
222 struct vax_double vd;
223 register struct dbl_limits *lim;
227 switch (xdrs->x_op) {
230 #if defined(mc68000) || defined(sparc) || defined(mips) || defined(mmax) || defined(_X86_)
233 vd = *((struct vax_double *)dp);
234 for (i = 0, lim = dbl_limits;
235 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
237 if ((vd.mantissa4 == lim->d.mantissa4) &&
238 (vd.mantissa3 == lim->d.mantissa3) &&
239 (vd.mantissa2 == lim->d.mantissa2) &&
240 (vd.mantissa1 == lim->d.mantissa1) &&
241 (vd.exp == lim->d.exp)) {
246 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
247 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
248 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
249 (vd.mantissa3 << 13) |
250 ((vd.mantissa4 >> 3) & MASK(13));
256 return (XDR_PUTLONG(xdrs, lp+1) && XDR_PUTLONG(xdrs, lp));
258 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
261 #if defined(mc68000) || defined(sparc) || defined(mips) || defined(mmax) || defined(_X86_)
264 return (XDR_GETLONG(xdrs, lp+1) && XDR_GETLONG(xdrs, lp));
266 return (XDR_GETLONG(xdrs, lp++) && XDR_GETLONG(xdrs, lp));
270 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
272 for (i = 0, lim = dbl_limits;
273 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
275 if ((id.mantissa2 == lim->ieee.mantissa2) &&
276 (id.mantissa1 == lim->ieee.mantissa1) &&
277 (id.exp == lim->ieee.exp)) {
282 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
283 vd.mantissa1 = (id.mantissa1 >> 13);
284 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
285 (id.mantissa2 >> 29);
286 vd.mantissa3 = (id.mantissa2 >> 13);
287 vd.mantissa4 = (id.mantissa2 << 3);
290 *dp = *((double *)&vd);