| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | /* $NetBSD: strtof.c,v 1.2.14.1 2008/04/08 21:10:55 jdc Exp $ */
|
| 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 | #include <LibConfig.h>
|
| 34 |
|
| 35 | #include "namespace.h"
|
| 36 | #include "gdtoaimp.h"
|
| 37 |
|
| 38 | #ifdef __weak_alias
|
| 39 | __weak_alias(strtof, _strtof)
|
| 40 | #endif
|
| 41 |
|
| 42 | float
|
| 43 | #ifdef KR_headers
|
| 44 | strtof(s, sp) CONST char *s; char **sp;
|
| 45 | #else
|
| 46 | strtof(CONST char *s, char **sp)
|
| 47 | #endif
|
| 48 | {
|
| 49 | static CONST FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, SI };
|
| 50 | ULong bits[1];
|
| 51 | Long expt;
|
| 52 | int k;
|
| 53 | union { ULong L[1]; float f; } u = { { 0 } };
|
| 54 |
|
| 55 | k = strtodg(s, sp, &fpi, &expt, bits);
|
| 56 | if (k == STRTOG_NoMemory) {
|
| 57 | errno = ERANGE;
|
| 58 | return HUGE_VALF;
|
| 59 | }
|
| 60 | switch(k & STRTOG_Retmask) {
|
| 61 | case STRTOG_NoNumber:
|
| 62 | case STRTOG_Zero:
|
| 63 | u.L[0] = 0;
|
| 64 | break;
|
| 65 |
|
| 66 | case STRTOG_Normal:
|
| 67 | case STRTOG_NaNbits:
|
| 68 | u.L[0] = (bits[0] & 0x7fffff) | ((expt + 0x7f + 23) << 23);
|
| 69 | break;
|
| 70 |
|
| 71 | case STRTOG_Denormal:
|
| 72 | u.L[0] = bits[0];
|
| 73 | break;
|
| 74 |
|
| 75 | case STRTOG_Infinite:
|
| 76 | u.L[0] = 0x7f800000;
|
| 77 | break;
|
| 78 |
|
| 79 | case STRTOG_NaN:
|
| 80 | u.L[0] = f_QNAN;
|
| 81 | }
|
| 82 | if (k & STRTOG_Neg)
|
| 83 | u.L[0] |= 0x80000000L;
|
| 84 | return u.f;
|
| 85 | }
|