1/* $NetBSD: strtodnrp.c,v 1.2 2008/03/21 23:13:48 christos Exp $ */ 2 3/**************************************************************** 4 5The author of this software is David M. Gay. 6 7Copyright (C) 2004 by David M. Gay. 8All Rights Reserved 9Based on material in the rest of /netlib/fp/gdota.tar.gz, 10which is copyright (C) 1998, 2000 by Lucent Technologies. 11 12Permission to use, copy, modify, and distribute this software and 13its documentation for any purpose and without fee is hereby 14granted, provided that the above copyright notice appear in all 15copies and that both that the copyright notice and this 16permission notice and warranty disclaimer appear in supporting 17documentation, and that the name of Lucent or any of its entities 18not be used in advertising or publicity pertaining to 19distribution of the software without specific, written prior 20permission. 21 22LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 23INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 24IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 25SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 26WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 27IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 28ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 29THIS SOFTWARE. 30 31****************************************************************/ 32 33/* This is a variant of strtod that works on Intel ia32 systems */ 34/* with the default extended-precision arithmetic -- it does not */ 35/* require setting the precision control to 53 bits. */ 36 37/* Please send bug reports to David M. Gay (dmg at acm dot org, 38 * with " at " changed at "@" and " dot " changed to "."). */ 39 40#include "gdtoaimp.h" 41 42 double 43#ifdef KR_headers 44strtod(s, sp) CONST char *s; char **sp; 45#else 46strtod(CONST char *s, char **sp) 47#endif 48{ 49 static const FPI fpi = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI }; 50 ULong bits[2]; 51 Long expt; 52 int k; 53 union { ULong L[2]; double d; } u; 54 55 k = strtodg(s, sp, &fpi, &expt, bits); 56 if (k == STRTOG_NoMemory) { 57 errno = ERANGE; 58 u.L[0] = Big0; 59 u.L[1] = Big1; 60 return u.d; 61 } 62 switch(k & STRTOG_Retmask) { 63 case STRTOG_NoNumber: 64 case STRTOG_Zero: 65 u.L[0] = u.L[1] = 0; 66 break; 67 68 case STRTOG_Normal: 69 u.L[_1] = bits[0]; 70 u.L[_0] = (bits[1] & ~0x100000) | ((expt + 0x3ff + 52) << 20); 71 break; 72 73 case STRTOG_Denormal: 74 u.L[_1] = bits[0]; 75 u.L[_0] = bits[1]; 76 break; 77 78 case STRTOG_Infinite: 79 u.L[_0] = 0x7ff00000; 80 u.L[_1] = 0; 81 break; 82 83 case STRTOG_NaN: 84 u.L[0] = d_QNAN0; 85 u.L[1] = d_QNAN1; 86 break; 87 88 case STRTOG_NaNbits: 89 u.L[_0] = 0x7ff00000 | bits[1]; 90 u.L[_1] = bits[0]; 91 } 92 if (k & STRTOG_Neg) 93 u.L[_0] |= 0x80000000L; 94 return u.d; 95 } 96