1 /* @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC */
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31 static char sccsid[] = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
35 * xdr_float.c, Generic XDR routines implementation.
37 * Copyright (C) 1984, Sun Microsystems, Inc.
39 * These are the "floating point" xdr routines used to (de)serialize
40 * most common data items. See xdr.h for more info on the interface to
50 #include <rpc/types.h>
55 * This routine works on Suns (Sky / 68000's) and Vaxen.
58 #define LSW (__FLOAT_WORD_ORDER == __BIG_ENDIAN)
62 /* What IEEE single precision floating point looks like on a Vax */
64 unsigned int mantissa: 23;
66 unsigned int sign : 1;
69 /* Vax single precision floating point */
71 unsigned int mantissa1 : 7;
73 unsigned int sign : 1;
74 unsigned int mantissa2 : 16;
77 #define VAX_SNG_BIAS 0x81
78 #define IEEE_SNG_BIAS 0x7f
80 static struct sgl_limits {
82 struct ieee_single ieee;
84 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
85 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
86 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
87 { 0x0, 0x0, 0x0 }} /* Min IEEE */
92 xdr_float(XDR *xdrs, float *fp)
95 struct ieee_single is;
96 struct vax_single vs, *vsp;
97 struct sgl_limits *lim;
100 switch (xdrs->x_op) {
104 vs = *((struct vax_single *)fp);
105 for (i = 0, lim = sgl_limits;
106 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
108 if ((vs.mantissa2 == lim->s.mantissa2) &&
109 (vs.exp == lim->s.exp) &&
110 (vs.mantissa1 == lim->s.mantissa1)) {
115 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
116 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
119 return (XDR_PUTLONG(xdrs, (long *)&is));
121 if (sizeof(float) == sizeof(long))
122 return (XDR_PUTLONG(xdrs, (long *)fp));
123 else if (sizeof(float) == sizeof(int)) {
124 long tmp = *(int *)fp;
125 return (XDR_PUTLONG(xdrs, &tmp));
132 vsp = (struct vax_single *)fp;
133 if (!XDR_GETLONG(xdrs, (long *)&is))
135 for (i = 0, lim = sgl_limits;
136 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
138 if ((is.exp == lim->ieee.exp) &&
139 (is.mantissa == lim->ieee.mantissa)) {
144 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
145 vsp->mantissa2 = is.mantissa;
146 vsp->mantissa1 = (is.mantissa >> 16);
151 if (sizeof(float) == sizeof(long))
152 return (XDR_GETLONG(xdrs, (long *)fp));
153 else if (sizeof(float) == sizeof(int)) {
155 if (XDR_GETLONG(xdrs, &tmp)) {
170 * This routine works on Suns (Sky / 68000's) and Vaxen.
174 /* What IEEE double precision floating point looks like on a Vax */
176 unsigned int mantissa1 : 20;
177 unsigned int exp : 11;
178 unsigned int sign : 1;
179 unsigned int mantissa2 : 32;
182 /* Vax double precision floating point */
184 unsigned int mantissa1 : 7;
185 unsigned int exp : 8;
186 unsigned int sign : 1;
187 unsigned int mantissa2 : 16;
188 unsigned int mantissa3 : 16;
189 unsigned int mantissa4 : 16;
192 #define VAX_DBL_BIAS 0x81
193 #define IEEE_DBL_BIAS 0x3ff
194 #define MASK(nbits) ((1 << nbits) - 1)
196 static struct dbl_limits {
198 struct ieee_double ieee;
200 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
201 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
202 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
203 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
210 xdr_double(XDR *xdrs, double *dp)
213 struct ieee_double id;
214 struct vax_double vd;
215 register struct dbl_limits *lim;
219 switch (xdrs->x_op) {
223 vd = *((struct vax_double *)dp);
224 for (i = 0, lim = dbl_limits;
225 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
227 if ((vd.mantissa4 == lim->d.mantissa4) &&
228 (vd.mantissa3 == lim->d.mantissa3) &&
229 (vd.mantissa2 == lim->d.mantissa2) &&
230 (vd.mantissa1 == lim->d.mantissa1) &&
231 (vd.exp == lim->d.exp)) {
236 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
237 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
238 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
239 (vd.mantissa3 << 13) |
240 ((vd.mantissa4 >> 3) & MASK(13));
245 if (2*sizeof(long) == sizeof(double)) {
246 long *lp = (long *)dp;
247 return (XDR_PUTLONG(xdrs, lp+!LSW) &&
248 XDR_PUTLONG(xdrs, lp+LSW));
249 } else if (2*sizeof(int) == sizeof(double)) {
254 return (XDR_PUTLONG(xdrs, tmp) &&
255 XDR_PUTLONG(xdrs, tmp+1));
262 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
264 for (i = 0, lim = dbl_limits;
265 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
267 if ((id.mantissa2 == lim->ieee.mantissa2) &&
268 (id.mantissa1 == lim->ieee.mantissa1) &&
269 (id.exp == lim->ieee.exp)) {
274 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
275 vd.mantissa1 = (id.mantissa1 >> 13);
276 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
277 (id.mantissa2 >> 29);
278 vd.mantissa3 = (id.mantissa2 >> 13);
279 vd.mantissa4 = (id.mantissa2 << 3);
282 *dp = *((double *)&vd);
285 if (2*sizeof(long) == sizeof(double)) {
286 long *lp = (long *)dp;
287 return (XDR_GETLONG(xdrs, lp+!LSW) &&
288 XDR_GETLONG(xdrs, lp+LSW));
289 } else if (2*sizeof(int) == sizeof(double)) {
292 if (XDR_GETLONG(xdrs, tmp+!LSW) &&
293 XDR_GETLONG(xdrs, tmp+LSW)) {