1 /****************************************************************
2
3 The author of this software is David M. Gay.
4
5 Copyright (C) 1998, 2000 by Lucent Technologies
6 All Rights Reserved
7
8 Permission to use, copy, modify, and distribute this software and
9 its documentation for any purpose and without fee is hereby
10 granted, provided that the above copyright notice appear in all
11 copies and that both that the copyright notice and this
12 permission notice and warranty disclaimer appear in supporting
13 documentation, and that the name of Lucent or any of its entities
14 not be used in advertising or publicity pertaining to
15 distribution of the software without specific, written prior
16 permission.
17
18 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
20 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
21 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
22 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
23 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
24 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
25 THIS SOFTWARE.
26
27 ****************************************************************/
28
29 /* Please send bug reports to David M. Gay (dmg at acm dot org,
30 * with " at " changed at "@" and " dot " changed to "."). */
31
32 #include "gdtoaimp.h"
33
34 #undef _0
35 #undef _1
36
37 /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
38
39 #ifdef IEEE_MC68k
40 #define _0 0
41 #define _1 1
42 #define _2 2
43 #define _3 3
44 #define _4 4
45 #endif
46 #ifdef IEEE_8087
47 #define _0 4
48 #define _1 3
49 #define _2 2
50 #define _3 1
51 #define _4 0
52 #endif
53
54 typedef union lD {
55 UShort L[5];
56 long double D;
57 } lD;
58
__strtopx(const char * s,char ** sp,lD * V)59 static int __strtopx (const char *s, char **sp, lD *V)
60 {
61 static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI,
62 Int_max };
63 ULong bits[2];
64 Long expo;
65 int k;
66 UShort *L = & (V->L[0]);
67 #ifdef Honor_FLT_ROUNDS
68 #include "gdtoa_fltrnds.h"
69 #else
70 #define fpi &fpi0
71 #endif
72 V->D = 0.0L;
73
74 k = __strtodg(s, sp, fpi, &expo, bits);
75 switch(k & STRTOG_Retmask) {
76 case STRTOG_NoNumber:
77 case STRTOG_Zero:
78 L[0] = L[1] = L[2] = L[3] = L[4] = 0;
79 break;
80
81 case STRTOG_Denormal:
82 L[_0] = 0;
83 goto normal_bits;
84
85 case STRTOG_Normal:
86 case STRTOG_NaNbits:
87 L[_0] = expo + 0x3fff + 63;
88 normal_bits:
89 L[_4] = (UShort)bits[0];
90 L[_3] = (UShort)(bits[0] >> 16);
91 L[_2] = (UShort)bits[1];
92 L[_1] = (UShort)(bits[1] >> 16);
93 break;
94
95 case STRTOG_Infinite:
96 L[_0] = 0x7fff;
97 L[_1] = 0x8000;
98 L[_2] = L[_3] = L[_4] = 0;
99 break;
100
101 case STRTOG_NaN:
102 L[0] = ldus_QNAN0;
103 L[1] = ldus_QNAN1;
104 L[2] = ldus_QNAN2;
105 L[3] = ldus_QNAN3;
106 L[4] = ldus_QNAN4;
107 }
108 if (k & STRTOG_Neg)
109 L[_0] |= 0x8000;
110 return k;
111 }
112
113 long double __cdecl
__strtold(const char * __restrict__ src,char ** __restrict__ endptr)114 __strtold (const char * __restrict__ src, char ** __restrict__ endptr)
115 {
116 lD ret;
117 ret.D = 0.0L;
118 __strtopx(src, endptr, &ret);
119 return ret.D;
120 }
121
122 long double __cdecl
123 __mingw_strtold (const char * __restrict__ src, char ** __restrict__ endptr)
124 __attribute__((alias("__strtold")));
125
126