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29 * @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro
30 * @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC
31 * $FreeBSD: src/lib/libc/xdr/xdr_float.c,v 1.7 1999/08/28 00:02:55 peter Exp $
32 * $DragonFly: src/lib/libc/xdr/xdr_float.c,v 1.5 2005/12/05 00:47:57 swildner Exp $
36 * xdr_float.c, Generic XDR routines impelmentation.
38 * Copyright (C) 1984, Sun Microsystems, Inc.
40 * These are the "floating point" xdr routines used to (de)serialize
41 * most common data items. See xdr.h for more info on the interface to
46 #include <sys/types.h>
47 #include <sys/param.h>
48 #include <rpc/types.h>
53 * This routine works on machines with IEEE754 FP and Vaxen.
56 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
57 defined(__mips__) || defined(__ns32k__) || defined(__arm32__) || \
59 #include <machine/endian.h>
65 /* What IEEE single precision floating point looks like on a Vax */
67 unsigned int mantissa: 23;
69 unsigned int sign : 1;
72 /* Vax single precision floating point */
74 unsigned int mantissa1 : 7;
76 unsigned int sign : 1;
77 unsigned int mantissa2 : 16;
80 #define VAX_SNG_BIAS 0x81
81 #define IEEE_SNG_BIAS 0x7f
83 static struct sgl_limits {
85 struct ieee_single ieee;
87 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
88 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
89 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
90 { 0x0, 0x0, 0x0 }} /* Min IEEE */
95 xdr_float(XDR *xdrs, float *fp)
101 struct ieee_single is;
102 struct vax_single vs, *vsp;
103 struct sgl_limits *lim;
106 switch (xdrs->x_op) {
110 tmpl = *(int32_t *)fp;
111 return (XDR_PUTLONG(xdrs, &tmpl));
113 vs = *((struct vax_single *)fp);
114 for (i = 0, lim = sgl_limits;
115 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
117 if ((vs.mantissa2 == lim->s.mantissa2) &&
118 (vs.exp == lim->s.exp) &&
119 (vs.mantissa1 == lim->s.mantissa1)) {
124 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
125 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
128 return (XDR_PUTLONG(xdrs, (long *)&is));
133 rv = XDR_GETLONG(xdrs, &tmpl);
134 *(int32_t *)fp = tmpl;
137 vsp = (struct vax_single *)fp;
138 if (!XDR_GETLONG(xdrs, (long *)&is))
140 for (i = 0, lim = sgl_limits;
141 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
143 if ((is.exp == lim->ieee.exp) &&
144 (is.mantissa == lim->ieee.mantissa)) {
149 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
150 vsp->mantissa2 = is.mantissa;
151 vsp->mantissa1 = (is.mantissa >> 16);
164 /* What IEEE double precision floating point looks like on a Vax */
166 unsigned int mantissa1 : 20;
167 unsigned int exp : 11;
168 unsigned int sign : 1;
169 unsigned int mantissa2 : 32;
172 /* Vax double precision floating point */
174 unsigned int mantissa1 : 7;
175 unsigned int exp : 8;
176 unsigned int sign : 1;
177 unsigned int mantissa2 : 16;
178 unsigned int mantissa3 : 16;
179 unsigned int mantissa4 : 16;
182 #define VAX_DBL_BIAS 0x81
183 #define IEEE_DBL_BIAS 0x3ff
184 #define MASK(nbits) ((1 << nbits) - 1)
186 static struct dbl_limits {
188 struct ieee_double ieee;
190 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
191 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
192 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
193 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
200 xdr_double(XDR *xdrs, double *dp)
208 struct ieee_double id;
209 struct vax_double vd;
210 struct dbl_limits *lim;
214 switch (xdrs->x_op) {
218 i32p = (int32_t *)dp;
219 #if BYTE_ORDER == BIG_ENDIAN
221 rv = XDR_PUTLONG(xdrs, &tmpl);
225 rv = XDR_PUTLONG(xdrs, &tmpl);
228 rv = XDR_PUTLONG(xdrs, &tmpl);
232 rv = XDR_PUTLONG(xdrs, &tmpl);
236 vd = *((struct vax_double *)dp);
237 for (i = 0, lim = dbl_limits;
238 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
240 if ((vd.mantissa4 == lim->d.mantissa4) &&
241 (vd.mantissa3 == lim->d.mantissa3) &&
242 (vd.mantissa2 == lim->d.mantissa2) &&
243 (vd.mantissa1 == lim->d.mantissa1) &&
244 (vd.exp == lim->d.exp)) {
249 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
250 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
251 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
252 (vd.mantissa3 << 13) |
253 ((vd.mantissa4 >> 3) & MASK(13));
257 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
262 i32p = (int32_t *)dp;
263 #if BYTE_ORDER == BIG_ENDIAN
264 rv = XDR_GETLONG(xdrs, &tmpl);
268 rv = XDR_GETLONG(xdrs, &tmpl);
271 rv = XDR_GETLONG(xdrs, &tmpl);
275 rv = XDR_GETLONG(xdrs, &tmpl);
281 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
283 for (i = 0, lim = dbl_limits;
284 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
286 if ((id.mantissa2 == lim->ieee.mantissa2) &&
287 (id.mantissa1 == lim->ieee.mantissa1) &&
288 (id.exp == lim->ieee.exp)) {
293 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
294 vd.mantissa1 = (id.mantissa1 >> 13);
295 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
296 (id.mantissa2 >> 29);
297 vd.mantissa3 = (id.mantissa2 >> 13);
298 vd.mantissa4 = (id.mantissa2 << 3);
301 *dp = *((double *)&vd);