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 } 86