xref: /freebsd/contrib/gdtoa/strtorQ.c (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
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 /* $FreeBSD$ */
33 
34 #include "gdtoaimp.h"
35 
36 #undef _0
37 #undef _1
38 
39 /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
40 
41 #ifdef IEEE_MC68k
42 #define _0 0
43 #define _1 1
44 #define _2 2
45 #define _3 3
46 #endif
47 #ifdef IEEE_8087
48 #define _0 3
49 #define _1 2
50 #define _2 1
51 #define _3 0
52 #endif
53 
54  void
55 #ifdef KR_headers
56 ULtoQ(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k;
57 #else
58 ULtoQ(ULong *L, ULong *bits, Long exp, int k)
59 #endif
60 {
61 	switch(k & STRTOG_Retmask) {
62 	  case STRTOG_NoNumber:
63 	  case STRTOG_Zero:
64 		L[0] = L[1] = L[2] = L[3] = 0;
65 		break;
66 
67 	  case STRTOG_Normal:
68 		L[_3] = bits[0];
69 		L[_2] = bits[1];
70 		L[_1] = bits[2];
71 		L[_0] = (bits[3] & ~0x10000) | ((exp + 0x3fff + 112) << 16);
72 		break;
73 
74 	  case STRTOG_NaNbits:
75 		L[_3] = bits[0];
76 		L[_2] = bits[1];
77 		L[_1] = bits[2];
78 		L[_0] = (bits[3] & ~0x10000)
79 		    | (((exp + 0x3fff + 112) << 16) | (1 << 15));
80 		break;
81 
82 	  case STRTOG_Denormal:
83 		L[_3] = bits[0];
84 		L[_2] = bits[1];
85 		L[_1] = bits[2];
86 		L[_0] = bits[3];
87 		break;
88 
89 	  case STRTOG_Infinite:
90 		L[_0] = 0x7fff0000;
91 		L[_1] = L[_2] = L[_3] = 0;
92 		break;
93 
94 	  case STRTOG_NaN:
95 		L[0] = ld_QNAN0;
96 		L[1] = ld_QNAN1;
97 		L[2] = ld_QNAN2;
98 		L[3] = ld_QNAN3;
99 	  }
100 	if (k & STRTOG_Neg)
101 		L[_0] |= 0x80000000L;
102 	}
103 
104  int
105 #ifdef KR_headers
106 strtorQ_l(s, sp, rounding, L, locale) CONST char *s; char **sp; int rounding;
107 void *L; locale_t locale;
108 #else
109 strtorQ_l(CONST char *s, char **sp, int rounding, void *L, locale_t locale)
110 #endif
111 {
112 	static FPI fpi0 = { 113, 1-16383-113+1, 32766-16383-113+1, 1, SI };
113 	FPI *fpi, fpi1;
114 	ULong bits[4];
115 	Long exp;
116 	int k;
117 
118 	fpi = &fpi0;
119 	if (rounding != FPI_Round_near) {
120 		fpi1 = fpi0;
121 		fpi1.rounding = rounding;
122 		fpi = &fpi1;
123 		}
124 	k = strtodg_l(s, sp, fpi, &exp, bits, locale);
125 	ULtoQ((ULong*)L, bits, exp, k);
126 	return k;
127 	}
128