2 * xdr_float.c, Generic XDR routines implementation.
4 * Copyright (C) 1984, Sun Microsystems, Inc.
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7 * modification, are permitted provided that the following conditions are
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23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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33 * These are the "floating point" xdr routines used to (de)serialize
34 * most common data items. See xdr.h for more info on the interface to
41 #include <rpc/types.h>
46 * This routine works on Suns (Sky / 68000's) and Vaxen.
49 #define LSW (__FLOAT_WORD_ORDER == __BIG_ENDIAN)
53 /* What IEEE single precision floating point looks like on a Vax */
55 unsigned int mantissa: 23;
57 unsigned int sign : 1;
60 /* Vax single precision floating point */
62 unsigned int mantissa1 : 7;
64 unsigned int sign : 1;
65 unsigned int mantissa2 : 16;
68 #define VAX_SNG_BIAS 0x81
69 #define IEEE_SNG_BIAS 0x7f
71 static struct sgl_limits {
73 struct ieee_single ieee;
75 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
76 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
77 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
78 { 0x0, 0x0, 0x0 }} /* Min IEEE */
88 struct ieee_single is;
89 struct vax_single vs, *vsp;
90 struct sgl_limits *lim;
97 vs = *((struct vax_single *)fp);
98 for (i = 0, lim = sgl_limits;
99 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
101 if ((vs.mantissa2 == lim->s.mantissa2) &&
102 (vs.exp == lim->s.exp) &&
103 (vs.mantissa1 == lim->s.mantissa1)) {
108 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
109 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
112 return (XDR_PUTLONG(xdrs, (long *)&is));
114 if (sizeof(float) == sizeof(long))
115 return (XDR_PUTLONG(xdrs, (long *)fp));
116 else if (sizeof(float) == sizeof(int)) {
117 long tmp = *(int *)fp;
118 return (XDR_PUTLONG(xdrs, &tmp));
125 vsp = (struct vax_single *)fp;
126 if (!XDR_GETLONG(xdrs, (long *)&is))
128 for (i = 0, lim = sgl_limits;
129 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
131 if ((is.exp == lim->ieee.exp) &&
132 (is.mantissa == lim->ieee.mantissa)) {
137 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
138 vsp->mantissa2 = is.mantissa;
139 vsp->mantissa1 = (is.mantissa >> 16);
144 if (sizeof(float) == sizeof(long))
145 return (XDR_GETLONG(xdrs, (long *)fp));
146 else if (sizeof(float) == sizeof(int)) {
148 if (XDR_GETLONG(xdrs, &tmp)) {
163 * This routine works on Suns (Sky / 68000's) and Vaxen.
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 struct ieee_double id;
209 struct vax_double vd;
210 register struct dbl_limits *lim;
214 switch (xdrs->x_op) {
218 vd = *((struct vax_double *)dp);
219 for (i = 0, lim = dbl_limits;
220 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
222 if ((vd.mantissa4 == lim->d.mantissa4) &&
223 (vd.mantissa3 == lim->d.mantissa3) &&
224 (vd.mantissa2 == lim->d.mantissa2) &&
225 (vd.mantissa1 == lim->d.mantissa1) &&
226 (vd.exp == lim->d.exp)) {
231 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
232 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
233 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
234 (vd.mantissa3 << 13) |
235 ((vd.mantissa4 >> 3) & MASK(13));
240 if (2*sizeof(long) == sizeof(double)) {
241 long *lp = (long *)dp;
242 return (XDR_PUTLONG(xdrs, lp+!LSW) &&
243 XDR_PUTLONG(xdrs, lp+LSW));
244 } else if (2*sizeof(int) == sizeof(double)) {
249 return (XDR_PUTLONG(xdrs, tmp) &&
250 XDR_PUTLONG(xdrs, tmp+1));
257 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
259 for (i = 0, lim = dbl_limits;
260 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
262 if ((id.mantissa2 == lim->ieee.mantissa2) &&
263 (id.mantissa1 == lim->ieee.mantissa1) &&
264 (id.exp == lim->ieee.exp)) {
269 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
270 vd.mantissa1 = (id.mantissa1 >> 13);
271 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
272 (id.mantissa2 >> 29);
273 vd.mantissa3 = (id.mantissa2 >> 13);
274 vd.mantissa4 = (id.mantissa2 << 3);
277 *dp = *((double *)&vd);
280 if (2*sizeof(long) == sizeof(double)) {
281 long *lp = (long *)dp;
282 return (XDR_GETLONG(xdrs, lp+!LSW) &&
283 XDR_GETLONG(xdrs, lp+LSW));
284 } else if (2*sizeof(int) == sizeof(double)) {
287 if (XDR_GETLONG(xdrs, tmp+!LSW) &&
288 XDR_GETLONG(xdrs, tmp+LSW)) {