1 /* @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC */
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30 #if !defined(lint) && defined(SCCSIDS)
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
52 * This routine works on Suns (Sky / 68000's) and Vaxen.
55 #define LSW (__FLOAT_WORD_ORDER == __BIG_ENDIAN)
59 /* What IEEE single precision floating point looks like on a Vax */
61 unsigned int mantissa: 23;
63 unsigned int sign : 1;
66 /* Vax single precision floating point */
68 unsigned int mantissa1 : 7;
70 unsigned int sign : 1;
71 unsigned int mantissa2 : 16;
74 #define VAX_SNG_BIAS 0x81
75 #define IEEE_SNG_BIAS 0x7f
77 static struct sgl_limits {
79 struct ieee_single ieee;
81 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
82 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
83 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
84 { 0x0, 0x0, 0x0 }} /* Min IEEE */
94 struct ieee_single is;
95 struct vax_single vs, *vsp;
96 struct sgl_limits *lim;
103 vs = *((struct vax_single *)fp);
104 for (i = 0, lim = sgl_limits;
105 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
107 if ((vs.mantissa2 == lim->s.mantissa2) &&
108 (vs.exp == lim->s.exp) &&
109 (vs.mantissa1 == lim->s.mantissa1)) {
114 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
115 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
118 return (XDR_PUTLONG(xdrs, (long *)&is));
120 if (sizeof(float) == sizeof(long))
121 return (XDR_PUTLONG(xdrs, (long *)fp));
122 else if (sizeof(float) == sizeof(int)) {
123 long tmp = *(int *)fp;
124 return (XDR_PUTLONG(xdrs, &tmp));
131 vsp = (struct vax_single *)fp;
132 if (!XDR_GETLONG(xdrs, (long *)&is))
134 for (i = 0, lim = sgl_limits;
135 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
137 if ((is.exp == lim->ieee.exp) &&
138 (is.mantissa == lim->ieee.mantissa)) {
143 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
144 vsp->mantissa2 = is.mantissa;
145 vsp->mantissa1 = (is.mantissa >> 16);
150 if (sizeof(float) == sizeof(long))
151 return (XDR_GETLONG(xdrs, (long *)fp));
152 else if (sizeof(float) == sizeof(int)) {
154 if (XDR_GETLONG(xdrs, &tmp)) {
169 * This routine works on Suns (Sky / 68000's) and Vaxen.
173 /* What IEEE double precision floating point looks like on a Vax */
175 unsigned int mantissa1 : 20;
176 unsigned int exp : 11;
177 unsigned int sign : 1;
178 unsigned int mantissa2 : 32;
181 /* Vax double precision floating point */
183 unsigned int mantissa1 : 7;
184 unsigned int exp : 8;
185 unsigned int sign : 1;
186 unsigned int mantissa2 : 16;
187 unsigned int mantissa3 : 16;
188 unsigned int mantissa4 : 16;
191 #define VAX_DBL_BIAS 0x81
192 #define IEEE_DBL_BIAS 0x3ff
193 #define MASK(nbits) ((1 << nbits) - 1)
195 static struct dbl_limits {
197 struct ieee_double ieee;
199 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
200 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
201 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
202 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
214 struct ieee_double id;
215 struct vax_double vd;
216 register struct dbl_limits *lim;
220 switch (xdrs->x_op) {
224 vd = *((struct vax_double *)dp);
225 for (i = 0, lim = dbl_limits;
226 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
228 if ((vd.mantissa4 == lim->d.mantissa4) &&
229 (vd.mantissa3 == lim->d.mantissa3) &&
230 (vd.mantissa2 == lim->d.mantissa2) &&
231 (vd.mantissa1 == lim->d.mantissa1) &&
232 (vd.exp == lim->d.exp)) {
237 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
238 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
239 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
240 (vd.mantissa3 << 13) |
241 ((vd.mantissa4 >> 3) & MASK(13));
246 if (2*sizeof(long) == sizeof(double)) {
247 long *lp = (long *)dp;
248 return (XDR_PUTLONG(xdrs, lp+!LSW) &&
249 XDR_PUTLONG(xdrs, lp+LSW));
250 } else if (2*sizeof(int) == sizeof(double)) {
255 return (XDR_PUTLONG(xdrs, tmp) &&
256 XDR_PUTLONG(xdrs, tmp+1));
263 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
265 for (i = 0, lim = dbl_limits;
266 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
268 if ((id.mantissa2 == lim->ieee.mantissa2) &&
269 (id.mantissa1 == lim->ieee.mantissa1) &&
270 (id.exp == lim->ieee.exp)) {
275 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
276 vd.mantissa1 = (id.mantissa1 >> 13);
277 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
278 (id.mantissa2 >> 29);
279 vd.mantissa3 = (id.mantissa2 >> 13);
280 vd.mantissa4 = (id.mantissa2 << 3);
283 *dp = *((double *)&vd);
286 if (2*sizeof(long) == sizeof(double)) {
287 long *lp = (long *)dp;
288 return (XDR_GETLONG(xdrs, lp+!LSW) &&
289 XDR_GETLONG(xdrs, lp+LSW));
290 } else if (2*sizeof(int) == sizeof(double)) {
293 if (XDR_GETLONG(xdrs, tmp+!LSW) &&
294 XDR_GETLONG(xdrs, tmp+LSW)) {