| 1 | /* $NetBSD: strtof.c,v 1.2.14.1 2008/04/08 21:10:55 jdc Exp $ */
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| 2 |
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| 3 | /****************************************************************
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| 4 |
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| 5 | The author of this software is David M. Gay.
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| 6 |
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| 7 | Copyright (C) 1998, 2000 by Lucent Technologies
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| 8 | All Rights Reserved
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| 9 |
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| 10 | Permission to use, copy, modify, and distribute this software and
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| 11 | its documentation for any purpose and without fee is hereby
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| 12 | granted, provided that the above copyright notice appear in all
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| 13 | copies and that both that the copyright notice and this
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| 14 | permission notice and warranty disclaimer appear in supporting
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| 15 | documentation, and that the name of Lucent or any of its entities
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| 16 | not be used in advertising or publicity pertaining to
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| 17 | distribution of the software without specific, written prior
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| 18 | permission.
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| 19 |
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| 20 | LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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| 21 | INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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| 22 | IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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| 23 | SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 24 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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| 25 | IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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| 26 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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| 27 | THIS SOFTWARE.
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| 28 |
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| 29 | ****************************************************************/
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| 30 |
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| 31 | /* Please send bug reports to David M. Gay (dmg at acm dot org,
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| 32 | * with " at " changed at "@" and " dot " changed to "."). */
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| 33 | #include <LibConfig.h>
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| 34 |
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| 35 | #include "namespace.h"
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| 36 | #include "gdtoaimp.h"
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| 37 |
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| 38 | #ifdef __weak_alias
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| 39 | __weak_alias(strtof, _strtof)
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| 40 | #endif
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| 41 |
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| 42 | float
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| 43 | #ifdef KR_headers
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| 44 | strtof(s, sp) CONST char *s; char **sp;
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| 45 | #else
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| 46 | strtof(CONST char *s, char **sp)
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| 47 | #endif
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| 48 | {
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| 49 | static CONST FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, SI };
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| 50 | ULong bits[1];
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| 51 | Long expt;
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| 52 | int k;
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| 53 | union { ULong L[1]; float f; } u = { 0 };
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| 54 |
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| 55 | k = strtodg(s, sp, &fpi, &expt, bits);
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| 56 | if (k == STRTOG_NoMemory) {
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| 57 | errno = ERANGE;
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| 58 | return HUGE_VALF;
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| 59 | }
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| 60 | switch(k & STRTOG_Retmask) {
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| 61 | case STRTOG_NoNumber:
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| 62 | case STRTOG_Zero:
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| 63 | u.L[0] = 0;
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| 64 | break;
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| 65 |
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| 66 | case STRTOG_Normal:
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| 67 | case STRTOG_NaNbits:
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| 68 | u.L[0] = (bits[0] & 0x7fffff) | ((expt + 0x7f + 23) << 23);
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| 69 | break;
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| 70 |
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| 71 | case STRTOG_Denormal:
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| 72 | u.L[0] = bits[0];
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| 73 | break;
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| 74 |
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| 75 | case STRTOG_Infinite:
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| 76 | u.L[0] = 0x7f800000;
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| 77 | break;
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| 78 |
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| 79 | case STRTOG_NaN:
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| 80 | u.L[0] = f_QNAN;
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| 81 | }
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| 82 | if (k & STRTOG_Neg)
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| 83 | u.L[0] |= 0x80000000L;
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| 84 | return u.f;
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| 85 | }
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