Annotation of src/lib/libc/gdtoa/strtorQ.c, Revision 1.3
1.3 ! christos 1: /* $NetBSD: strtorQ.c,v 1.2 2006/01/25 15:27:42 kleink Exp $ */
1.1 kleink 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:
1.2 kleink 39: /* one or the other of IEEE_BIG_ENDIAN or IEEE_LITTLE_ENDIAN should be #defined */
1.1 kleink 40:
1.2 kleink 41: #ifdef IEEE_BIG_ENDIAN
1.1 kleink 42: #define _0 0
43: #define _1 1
44: #define _2 2
45: #define _3 3
46: #endif
1.2 kleink 47: #ifdef IEEE_LITTLE_ENDIAN
1.1 kleink 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: case STRTOG_NaNbits:
69: L[_3] = bits[0];
70: L[_2] = bits[1];
71: L[_1] = bits[2];
72: L[_0] = (bits[3] & ~0x10000) | ((exp + 0x3fff + 112) << 16);
73: break;
74:
75: case STRTOG_Denormal:
76: L[_3] = bits[0];
77: L[_2] = bits[1];
78: L[_1] = bits[2];
79: L[_0] = bits[3];
80: break;
81:
82: case STRTOG_Infinite:
83: L[_0] = 0x7fff0000;
84: L[_1] = L[_2] = L[_3] = 0;
85: break;
86:
87: case STRTOG_NaN:
88: L[0] = ld_QNAN0;
89: L[1] = ld_QNAN1;
90: L[2] = ld_QNAN2;
91: L[3] = ld_QNAN3;
92: }
93: if (k & STRTOG_Neg)
94: L[_0] |= 0x80000000L;
95: }
96:
97: int
98: #ifdef KR_headers
99: strtorQ(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
100: #else
101: strtorQ(CONST char *s, char **sp, int rounding, void *L)
102: #endif
103: {
104: static FPI fpi0 = { 113, 1-16383-113+1, 32766-16383-113+1, 1, SI };
105: FPI *fpi, fpi1;
106: ULong bits[4];
107: Long exp;
108: int k;
109:
110: fpi = &fpi0;
111: if (rounding != FPI_Round_near) {
112: fpi1 = fpi0;
113: fpi1.rounding = rounding;
114: fpi = &fpi1;
115: }
116: k = strtodg(s, sp, fpi, &exp, bits);
1.3 ! christos 117: if (k == STRTOG_NoMemory)
! 118: return k;
1.1 kleink 119: ULtoQ((ULong*)L, bits, exp, k);
120: return k;
121: }
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