1 /* $NetBSD: strtorx.c,v 1.4 2011/03/20 23:15:35 christos Exp $ */
2
3 /****************************************************************
4
5 The author of this software is David M. Gay.
6
7 Copyright (C) 1998, 2000 by Lucent Technologies
8 All Rights Reserved
9
10 Permission to use, copy, modify, and distribute this software and
11 its documentation for any purpose and without fee is hereby
12 granted, provided that the above copyright notice appear in all
13 copies and that both that the copyright notice and this
14 permission notice and warranty disclaimer appear in supporting
15 documentation, and that the name of Lucent or any of its entities
16 not be used in advertising or publicity pertaining to
17 distribution of the software without specific, written prior
18 permission.
19
20 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
21 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
22 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
23 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
24 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
25 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
26 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
27 THIS SOFTWARE.
28
29 ****************************************************************/
30
31 /* Please send bug reports to David M. Gay (dmg at acm dot org,
32 * with " at " changed at "@" and " dot " changed to "."). */
33
34 #include "gdtoaimp.h"
35
36 #undef _0
37 #undef _1
38
39 /* one or the other of IEEE_BIG_ENDIAN or IEEE_LITTLE_ENDIAN should be #defined */
40
41 #ifdef IEEE_BIG_ENDIAN
42 #define _0 0
43 #define _1 1
44 #define _2 2
45 #define _3 3
46 #define _4 4
47 #endif
48 #ifdef IEEE_LITTLE_ENDIAN
49 #define _0 4
50 #define _1 3
51 #define _2 2
52 #define _3 1
53 #define _4 0
54 #endif
55
56 void
57 #ifdef KR_headers
ULtox(L,bits,expt,k)58 ULtox(L, bits, expt, k) UShort *L; ULong *bits; Long expt; int k;
59 #else
60 ULtox(UShort *L, ULong *bits, Long expt, int k)
61 #endif
62 {
63 switch(k & STRTOG_Retmask) {
64 case STRTOG_NoNumber:
65 case STRTOG_Zero:
66 L[0] = L[1] = L[2] = L[3] = L[4] = 0;
67 break;
68
69 case STRTOG_Denormal:
70 L[_0] = 0;
71 goto normal_bits;
72
73 case STRTOG_Normal:
74 case STRTOG_NaNbits:
75 L[_0] = expt + 0x3fff + 63;
76 normal_bits:
77 L[_4] = (UShort)bits[0];
78 L[_3] = (UShort)(bits[0] >> 16);
79 L[_2] = (UShort)bits[1];
80 L[_1] = (UShort)(bits[1] >> 16);
81 break;
82
83 case STRTOG_Infinite:
84 L[_0] = 0x7fff;
85 L[_1] = 0x8000;
86 L[_2] = L[_3] = L[_4] = 0;
87 break;
88
89 case STRTOG_NaN:
90 L[0] = ldus_QNAN0;
91 L[1] = ldus_QNAN1;
92 L[2] = ldus_QNAN2;
93 L[3] = ldus_QNAN3;
94 L[4] = ldus_QNAN4;
95 }
96 if (k & STRTOG_Neg)
97 L[_0] |= 0x8000;
98 }
99
100 int
101 #ifdef KR_headers
strtorx(s,sp,rounding,L)102 strtorx(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
103 #else
104 strtorx(CONST char *s, char **sp, int rounding, void *L)
105 #endif
106 {
107 static CONST FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
108 CONST FPI *fpi;
109 FPI fpi1;
110 ULong bits[2];
111 Long expt;
112 int k;
113
114 fpi = &fpi0;
115 if (rounding != FPI_Round_near) {
116 fpi1 = fpi0;
117 fpi1.rounding = rounding;
118 fpi = &fpi1;
119 }
120 k = strtodg(s, sp, fpi, &expt, bits);
121 if (k == STRTOG_NoMemory)
122 return k;
123 ULtox((UShort*)L, bits, expt, k);
124 return k;
125 }
126