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 #define _DEFAULT_SOURCE
33 #include <errno.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include "mprec.h"
37 #include "gdtoa.h"
38
39 #if defined (_HAVE_LONG_DOUBLE) && !defined (_LDBL_EQ_DBL) && __LDBL_MANT_DIG__ == 64
40
41 /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
42
43 #ifdef IEEE_MC68k
44 #define _0 0
45 #define _1 2
46 #define _2 3
47 #define _3 4
48 #define _4 5
49 #endif
50 #ifdef IEEE_8087
51 #define _0 4
52 #define _1 3
53 #define _2 2
54 #define _3 1
55 #define _4 0
56 #endif
57
58 static void
ULtox(__UShort * L,__ULong * bits,Long exp,int k)59 ULtox(__UShort *L, __ULong *bits, Long exp, int k)
60 {
61 switch(k & STRTOG_Retmask) {
62 case STRTOG_NoNumber:
63 case STRTOG_Zero:
64 L[_0] = L[_1] = L[_2] = L[_3] = L[_4] = 0;
65 break;
66
67 case STRTOG_Denormal:
68 L[_0] = 0;
69 goto normal_bits;
70
71 case STRTOG_Normal:
72 case STRTOG_NaNbits:
73 L[_0] = exp + 0x3fff + 63;
74 normal_bits:
75 L[_4] = (__UShort)bits[0];
76 L[_3] = (__UShort)(bits[0] >> 16);
77 L[_2] = (__UShort)bits[1];
78 L[_1] = (__UShort)(bits[1] >> 16);
79
80 break;
81
82 case STRTOG_Infinite:
83 L[_0] = 0x7fff;
84 L[_1] = 0x8000;
85 L[_2] = L[_3] = L[_4] = 0;
86 break;
87
88 case STRTOG_NaN:
89 *((long double*)L) = __builtin_nanl ("");
90 }
91 if (k & STRTOG_Neg)
92 L[_0] |= 0x8000;
93 }
94
95 int
96 #ifdef KR_headers
_strtorx_l(s,sp,rounding,L,loc)97 _strtorx_l(s, sp, rounding, L, loc) const char *s; char **sp; int rounding; void *L; locale_t loc;
98 #else
99 _strtorx_l(const char *s, char **sp, int rounding, void *L,
100 locale_t loc)
101 #endif
102 {
103 static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
104 FPI *fpi, fpi1;
105 __ULong bits[2];
106 Long exp;
107 int k;
108
109 fpi = &fpi0;
110 if (rounding != FPI_Round_near) {
111 fpi1 = fpi0;
112 fpi1.rounding = rounding;
113 fpi = &fpi1;
114 }
115 k = _strtodg_l(s, sp, fpi, &exp, bits, loc);
116 ULtox((__UShort*)L, bits, exp, k);
117 return k;
118 }
119
120 #endif /* _HAVE_LONG_DOUBLE && !_LDBL_EQ_DBL */
121
