Piotr Caban : msvcrt: Improved strtod_l precision.
Alexandre Julliard
julliard at winehq.org
Tue Nov 6 14:27:29 CST 2012
Module: wine
Branch: master
Commit: cbb94b1fcc73f50d1ec00121cb86060ab44b5bb8
URL: http://source.winehq.org/git/wine.git/?a=commit;h=cbb94b1fcc73f50d1ec00121cb86060ab44b5bb8
Author: Piotr Caban <piotr at codeweavers.com>
Date: Tue Nov 6 10:33:51 2012 +0100
msvcrt: Improved strtod_l precision.
---
dlls/msvcrt/string.c | 17 ++++++++++++-----
1 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/dlls/msvcrt/string.c b/dlls/msvcrt/string.c
index 2a6a8ca..ad33f6a 100644
--- a/dlls/msvcrt/string.c
+++ b/dlls/msvcrt/string.c
@@ -291,7 +291,8 @@ double CDECL MSVCRT_strtod_l( const char *str, char **end, MSVCRT__locale_t loca
int exp=0, sign=1;
const char *p;
double ret;
- BOOL found_digit = FALSE;
+ long double lret=1, expcnt = 10;
+ BOOL found_digit = FALSE, negexp;
if (!MSVCRT_CHECK_PMT(str != NULL)) return 0;
@@ -378,10 +379,16 @@ double CDECL MSVCRT_strtod_l( const char *str, char **end, MSVCRT__locale_t loca
_control87(MSVCRT__EM_DENORMAL|MSVCRT__EM_INVALID|MSVCRT__EM_ZERODIVIDE
|MSVCRT__EM_OVERFLOW|MSVCRT__EM_UNDERFLOW|MSVCRT__EM_INEXACT, 0xffffffff);
- if(exp>0)
- ret = (double)sign*d*pow(10, exp);
- else
- ret = (double)sign*d/pow(10, -exp);
+ negexp = (exp < 0);
+ if(negexp)
+ exp = -exp;
+ while(exp) {
+ if(exp & 1)
+ lret *= expcnt;
+ exp /= 2;
+ expcnt = expcnt*expcnt;
+ }
+ ret = (long double)sign * (negexp ? d/lret : d*lret);
_control87(fpcontrol, 0xffffffff);
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