1 /* $NetBSD: strtodnrp.c,v 1.2 2008/03/21 23:13:48 christos Exp $ */ 2 3 /**************************************************************** 4 5 The author of this software is David M. Gay. 6 7 Copyright (C) 2004 by David M. Gay. 8 All Rights Reserved 9 Based on material in the rest of /netlib/fp/gdota.tar.gz, 10 which is copyright (C) 1998, 2000 by Lucent Technologies. 11 12 Permission to use, copy, modify, and distribute this software and 13 its documentation for any purpose and without fee is hereby 14 granted, provided that the above copyright notice appear in all 15 copies and that both that the copyright notice and this 16 permission notice and warranty disclaimer appear in supporting 17 documentation, and that the name of Lucent or any of its entities 18 not be used in advertising or publicity pertaining to 19 distribution of the software without specific, written prior 20 permission. 21 22 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 23 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 24 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 25 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 26 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 27 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 28 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 29 THIS 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 44 strtod(s, sp) CONST char *s; char **sp; 45 #else 46 strtod(CONST char *s, char **sp) 47 #endif 48 { 49 static FPI fpi = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI }; 50 ULong bits[2]; 51 Long exp; 52 int k; 53 union { ULong L[2]; double d; } u; 54 55 k = strtodg(s, sp, &fpi, &exp, 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) | ((exp + 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