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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 1.4 2005/03/13 15:10:03 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 */
103 struct ieee_single is;
104 struct vax_single vs, *vsp;
105 struct sgl_limits *lim;
108 switch (xdrs->x_op) {
112 tmpl = *(int32_t *)fp;
113 return (XDR_PUTLONG(xdrs, &tmpl));
115 vs = *((struct vax_single *)fp);
116 for (i = 0, lim = sgl_limits;
117 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
119 if ((vs.mantissa2 == lim->s.mantissa2) &&
120 (vs.exp == lim->s.exp) &&
121 (vs.mantissa1 == lim->s.mantissa1)) {
126 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
127 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
130 return (XDR_PUTLONG(xdrs, (long *)&is));
135 rv = XDR_GETLONG(xdrs, &tmpl);
136 *(int32_t *)fp = tmpl;
139 vsp = (struct vax_single *)fp;
140 if (!XDR_GETLONG(xdrs, (long *)&is))
142 for (i = 0, lim = sgl_limits;
143 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
145 if ((is.exp == lim->ieee.exp) &&
146 (is.mantissa == lim->ieee.mantissa)) {
151 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
152 vsp->mantissa2 = is.mantissa;
153 vsp->mantissa1 = (is.mantissa >> 16);
166 /* What IEEE double precision floating point looks like on a Vax */
168 unsigned int mantissa1 : 20;
169 unsigned int exp : 11;
170 unsigned int sign : 1;
171 unsigned int mantissa2 : 32;
174 /* Vax double precision floating point */
176 unsigned int mantissa1 : 7;
177 unsigned int exp : 8;
178 unsigned int sign : 1;
179 unsigned int mantissa2 : 16;
180 unsigned int mantissa3 : 16;
181 unsigned int mantissa4 : 16;
184 #define VAX_DBL_BIAS 0x81
185 #define IEEE_DBL_BIAS 0x3ff
186 #define MASK(nbits) ((1 << nbits) - 1)
188 static struct dbl_limits {
190 struct ieee_double ieee;
192 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
193 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
194 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
195 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
212 struct ieee_double id;
213 struct vax_double vd;
214 struct dbl_limits *lim;
218 switch (xdrs->x_op) {
222 i32p = (int32_t *)dp;
223 #if BYTE_ORDER == BIG_ENDIAN
225 rv = XDR_PUTLONG(xdrs, &tmpl);
229 rv = XDR_PUTLONG(xdrs, &tmpl);
232 rv = XDR_PUTLONG(xdrs, &tmpl);
236 rv = XDR_PUTLONG(xdrs, &tmpl);
240 vd = *((struct vax_double *)dp);
241 for (i = 0, lim = dbl_limits;
242 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
244 if ((vd.mantissa4 == lim->d.mantissa4) &&
245 (vd.mantissa3 == lim->d.mantissa3) &&
246 (vd.mantissa2 == lim->d.mantissa2) &&
247 (vd.mantissa1 == lim->d.mantissa1) &&
248 (vd.exp == lim->d.exp)) {
253 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
254 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
255 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
256 (vd.mantissa3 << 13) |
257 ((vd.mantissa4 >> 3) & MASK(13));
261 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
266 i32p = (int32_t *)dp;
267 #if BYTE_ORDER == BIG_ENDIAN
268 rv = XDR_GETLONG(xdrs, &tmpl);
272 rv = XDR_GETLONG(xdrs, &tmpl);
275 rv = XDR_GETLONG(xdrs, &tmpl);
279 rv = XDR_GETLONG(xdrs, &tmpl);
285 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
287 for (i = 0, lim = dbl_limits;
288 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
290 if ((id.mantissa2 == lim->ieee.mantissa2) &&
291 (id.mantissa1 == lim->ieee.mantissa1) &&
292 (id.exp == lim->ieee.exp)) {
297 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
298 vd.mantissa1 = (id.mantissa1 >> 13);
299 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
300 (id.mantissa2 >> 29);
301 vd.mantissa3 = (id.mantissa2 >> 13);
302 vd.mantissa4 = (id.mantissa2 << 3);
305 *dp = *((double *)&vd);