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msvcrt: Improved scanf precision.

This commit is contained in:
Piotr Caban 2012-11-05 11:40:20 +01:00 committed by Alexandre Julliard
parent 34951f3154
commit 74ec93bab7
1 changed files with 21 additions and 2 deletions
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23
dlls/msvcrt/scanf.h
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@ -310,9 +310,11 @@ _FUNCTION_ {
case 'f':
case 'g':
case 'G': { /* read a float */
long double cur;
long double cur = 1, expcnt = 10;
ULONGLONG d, hlp;
int exp = 0, negative = 0;
unsigned fpcontrol;
BOOL negexp;
/* skip initial whitespace */
while ((nch!=_EOF_) && _ISSPACE_(nch))
@ -401,7 +403,24 @@ _FUNCTION_ {
else exp += e;
}
cur = (exp>=0 ? d*pow(10, exp) : d/pow(10, -exp));
fpcontrol = _control87(0, 0);
_control87(MSVCRT__EM_DENORMAL|MSVCRT__EM_INVALID|MSVCRT__EM_ZERODIVIDE
|MSVCRT__EM_OVERFLOW|MSVCRT__EM_UNDERFLOW|MSVCRT__EM_INEXACT, 0xffffffff);
negexp = (exp < 0);
if(negexp)
exp = -exp;
/* update 'cur' with this exponent. */
while(exp) {
if(exp & 1)
cur *= expcnt;
exp /= 2;
expcnt = expcnt*expcnt;
}
cur = (negexp ? d/cur : d*cur);
_control87(fpcontrol, 0xffffffff);
st = 1;
if (!suppress) {
if (L_prefix) _SET_NUMBER_(double);