strtof.c revision 1.6 
1/* $NetBSD: strtof.c,v 1.6 2013/04/18 21:54:11 joerg Exp $ */
2
3/****************************************************************
4
5The author of this software is David M. Gay.
6
7Copyright (C) 1998, 2000 by Lucent Technologies
8All Rights Reserved
9
10Permission to use, copy, modify, and distribute this software and
11its documentation for any purpose and without fee is hereby
12granted, provided that the above copyright notice appear in all
13copies and that both that the copyright notice and this
14permission notice and warranty disclaimer appear in supporting
15documentation, and that the name of Lucent or any of its entities
16not be used in advertising or publicity pertaining to
17distribution of the software without specific, written prior
18permission.
19
20LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
21INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
22IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
23SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
24WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
25IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
26ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
27THIS 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 "namespace.h"
35#include "gdtoaimp.h"
36
37#include <locale.h>
38#include "setlocale_local.h"
39
40#ifdef __weak_alias
41__weak_alias(strtof, _strtof)
42__weak_alias(strtof_l, _strtof_l)
43#endif
44
45static float
46_int_strtof_l(CONST char *s, char **sp, locale_t loc)
47{
48	static CONST FPI fpi0 = { 24, 1-127-24+1,  254-127-24+1, 1, SI };
49	ULong bits[1];
50	Long expt;
51	int k;
52	union { ULong L[1]; float f; } u;
53#ifdef Honor_FLT_ROUNDS
54#include "gdtoa_fltrnds.h"
55#else
56#define fpi &fpi0
57#endif
58
59	k = strtodg(s, sp, fpi, &expt, bits, loc);
60	if (k == STRTOG_NoMemory) {
61		errno = ERANGE;
62		return HUGE_VALF;
63	}
64	switch(k & STRTOG_Retmask) {
65	  case STRTOG_NoNumber:
66	  case STRTOG_Zero:
67		u.L[0] = 0;
68		break;
69
70	  case STRTOG_Normal:
71	  case STRTOG_NaNbits:
72		u.L[0] = (bits[0] & 0x7fffff) | ((expt + 0x7f + 23) << 23);
73		break;
74
75	  case STRTOG_Denormal:
76		u.L[0] = bits[0];
77		break;
78
79	  case STRTOG_Infinite:
80		u.L[0] = 0x7f800000;
81		break;
82
83	  case STRTOG_NaN:
84		u.L[0] = f_QNAN;
85		break;
86
87	  default:
88		u.L[0] = 0; /* for gcc warning */
89		break;
90	  }
91	if (k & STRTOG_Neg)
92		u.L[0] |= 0x80000000L;
93	return u.f;
94	}
95
96float
97strtof(CONST char *s, char **sp)
98{
99	return _int_strtof_l(s, sp, *_current_locale());
100}
101
102float
103strtof_l(CONST char *s, char **sp, locale_t loc)
104{
105	if (loc == NULL)
106		loc = _C_locale;
107	return _int_strtof_l(s, sp, loc);
108}
109