| 1 | /**************************************************************** |
| 2 | |
| 3 | The author of this software is David M. Gay. |
| 4 | |
| 5 | Copyright (C) 2004 by David M. Gay. |
| 6 | All Rights Reserved |
| 7 | Based on material in the rest of /netlib/fp/gdota.tar.gz, |
| 8 | which is copyright (C) 1998, 2000 by Lucent Technologies. |
| 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 | /* This is a variant of strtod that works on Intel ia32 systems */ |
| 32 | /* with the default extended-precision arithmetic -- it does not */ |
| 33 | /* require setting the precision control to 53 bits. */ |
| 34 | |
| 35 | /* Please send bug reports to David M. Gay (dmg at acm dot org, |
| 36 | * with " at " changed at "@" and " dot " changed to "."). */ |
| 37 | |
| 38 | #include "gdtoaimp.h" |
| 39 | |
| 40 | double __strtod (const char *s, char **sp) |
| 41 | { |
| 42 | static FPI fpi = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI, Int_max /*unused*/ }; |
| 43 | ULong bits[2]; |
| 44 | Long expo; |
| 45 | int k; |
| 46 | union { ULong L[2]; double d; } u; |
| 47 | |
| 48 | k = __strtodg (s, sp, &fpi, &expo, bits); |
| 49 | switch(k & STRTOG_Retmask) { |
| 50 | case STRTOG_NoNumber: |
| 51 | case STRTOG_Zero: |
| 52 | u.L[0] = u.L[1] = 0; |
| 53 | break; |
| 54 | |
| 55 | case STRTOG_Normal: |
| 56 | u.L[_1] = bits[0]; |
| 57 | u.L[_0] = (bits[1] & ~0x100000) | ((expo + 0x3ff + 52) << 20); |
| 58 | break; |
| 59 | |
| 60 | case STRTOG_Denormal: |
| 61 | u.L[_1] = bits[0]; |
| 62 | u.L[_0] = bits[1]; |
| 63 | break; |
| 64 | |
| 65 | case STRTOG_Infinite: |
| 66 | u.L[_0] = 0x7ff00000; |
| 67 | u.L[_1] = 0; |
| 68 | break; |
| 69 | |
| 70 | case STRTOG_NaN: |
| 71 | u.L[_1] = d_QNAN0; |
| 72 | u.L[_0] = d_QNAN1; |
| 73 | break; |
| 74 | |
| 75 | case STRTOG_NaNbits: |
| 76 | u.L[_0] = 0x7ff00000 | bits[1]; |
| 77 | u.L[_1] = bits[0]; |
| 78 | } |
| 79 | if (k & STRTOG_Neg) |
| 80 | u.L[_0] |= 0x80000000L; |
| 81 | return u.d; |
| 82 | } |
| 83 | |
| 84 | double __cdecl |
| 85 | __mingw_strtod (const char * __restrict__ src, char ** __restrict__ endptr) |
| 86 | __attribute__((alias("__strtod"))); |
| 87 | |
| 88 | #if __SIZEOF_LONG_DOUBLE__ == __SIZEOF_DOUBLE__ |
| 89 | /* For systems other than x86, where long double == double, provide the |
| 90 | * long double functions as aliases to __strtod. */ |
| 91 | |
| 92 | long double __cdecl |
| 93 | __mingw_strtold (const char * __restrict__ src, char ** __restrict__ endptr) |
| 94 | __attribute__((alias("__strtod"))); |
| 95 | #endif |