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 impelmentation.
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
46 #include <rpc/types.h>
51 * This routine works on Suns (Sky / 68000's) and Vaxen.
56 /* What IEEE single precision floating point looks like on a Vax */
58 unsigned int mantissa: 23;
60 unsigned int sign : 1;
63 /* Vax single precision floating point */
65 unsigned int mantissa1 : 7;
67 unsigned int sign : 1;
68 unsigned int mantissa2 : 16;
71 #define VAX_SNG_BIAS 0x81
72 #define IEEE_SNG_BIAS 0x7f
74 static struct sgl_limits {
76 struct ieee_single ieee;
78 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
79 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
80 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
81 { 0x0, 0x0, 0x0 }} /* Min IEEE */
91 struct ieee_single is;
92 struct vax_single vs, *vsp;
93 struct sgl_limits *lim;
100 return (XDR_PUTLONG(xdrs, (long *)fp));
102 vs = *((struct vax_single *)fp);
103 for (i = 0, lim = sgl_limits;
104 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
106 if ((vs.mantissa2 == lim->s.mantissa2) &&
107 (vs.exp == lim->s.exp) &&
108 (vs.mantissa1 == lim->s.mantissa1)) {
113 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
114 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
117 return (XDR_PUTLONG(xdrs, (long *)&is));
122 return (XDR_GETLONG(xdrs, (long *)fp));
124 vsp = (struct vax_single *)fp;
125 if (!XDR_GETLONG(xdrs, (long *)&is))
127 for (i = 0, lim = sgl_limits;
128 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
130 if ((is.exp == lim->ieee.exp) &&
131 (is.mantissa == lim->ieee.mantissa)) {
136 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
137 vsp->mantissa2 = is.mantissa;
138 vsp->mantissa1 = (is.mantissa >> 16);
151 * This routine works on Suns (Sky / 68000's) and Vaxen.
155 /* What IEEE double precision floating point looks like on a Vax */
157 unsigned int mantissa1 : 20;
158 unsigned int exp : 11;
159 unsigned int sign : 1;
160 unsigned int mantissa2 : 32;
163 /* Vax double precision floating point */
165 unsigned int mantissa1 : 7;
166 unsigned int exp : 8;
167 unsigned int sign : 1;
168 unsigned int mantissa2 : 16;
169 unsigned int mantissa3 : 16;
170 unsigned int mantissa4 : 16;
173 #define VAX_DBL_BIAS 0x81
174 #define IEEE_DBL_BIAS 0x3ff
175 #define MASK(nbits) ((1 << nbits) - 1)
177 static struct dbl_limits {
179 struct ieee_double ieee;
181 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
182 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
183 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
184 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
197 struct ieee_double id;
198 struct vax_double vd;
199 register struct dbl_limits *lim;
203 switch (xdrs->x_op) {
209 vd = *((struct vax_double *)dp);
210 for (i = 0, lim = dbl_limits;
211 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
213 if ((vd.mantissa4 == lim->d.mantissa4) &&
214 (vd.mantissa3 == lim->d.mantissa3) &&
215 (vd.mantissa2 == lim->d.mantissa2) &&
216 (vd.mantissa1 == lim->d.mantissa1) &&
217 (vd.exp == lim->d.exp)) {
222 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
223 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
224 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
225 (vd.mantissa3 << 13) |
226 ((vd.mantissa4 >> 3) & MASK(13));
231 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
236 return (XDR_GETLONG(xdrs, lp++) && XDR_GETLONG(xdrs, lp));
239 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
241 for (i = 0, lim = dbl_limits;
242 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
244 if ((id.mantissa2 == lim->ieee.mantissa2) &&
245 (id.mantissa1 == lim->ieee.mantissa1) &&
246 (id.exp == lim->ieee.exp)) {
251 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
252 vd.mantissa1 = (id.mantissa1 >> 13);
253 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
254 (id.mantissa2 >> 29);
255 vd.mantissa3 = (id.mantissa2 >> 13);
256 vd.mantissa4 = (id.mantissa2 << 3);
259 *dp = *((double *)&vd);