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Improved accuracy on text-to-real and real-to-text conversions. Most

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conversions now round-trip correctly.  Still need to fix some corner
cases.

FossilOrigin-Name: 8ecffca900cd6a8922001fd458a266ce8c83fb66
This commit is contained in:
drh
2012-06-19 03:11:25 +00:00
parent 89f15088f0
commit 72b3fbc7b5
6 changed files with 63 additions and 22 deletions
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15
src/printf.c
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@@ -124,7 +124,8 @@ static const et_info fmtinfo[] = {
static char et_getdigit(LONGDOUBLE_TYPE *val, int *cnt){
int digit;
LONGDOUBLE_TYPE d;
if( (*cnt)++ >= 16 ) return '0';
if( (*cnt)<=0 ) return '0';
(*cnt)--;
digit = (int)*val;
d = digit;
digit += '0';
@@ -428,9 +429,11 @@ void sqlite3VXPrintf(
break;
}
if( realvalue>0.0 ){
while( realvalue>=1e32 && exp<=350 ){ realvalue *= 1e-32; exp+=32; }
while( realvalue>=1e8 && exp<=350 ){ realvalue *= 1e-8; exp+=8; }
while( realvalue>=10.0 && exp<=350 ){ realvalue *= 0.1; exp++; }
LONGDOUBLE_TYPE scale = 1.0;
while( realvalue>=1e64*scale && exp<=350 ){ scale *= 1e64; exp+=64; }
while( realvalue>=1e8*scale && exp<=350 ){ scale *= 1e8; exp+=8; }
while( realvalue>=10.0*scale && exp<=350 ){ scale *= 10.0; exp++; }
realvalue /= scale;
while( realvalue<1e-8 ){ realvalue *= 1e8; exp-=8; }
while( realvalue<1.0 ){ realvalue *= 10.0; exp--; }
if( exp>350 ){
@@ -463,7 +466,7 @@ void sqlite3VXPrintf(
xtype = etFLOAT;
}
}else{
flag_rtz = 0;
flag_rtz = flag_altform2;
}
if( xtype==etEXP ){
e2 = 0;
@@ -478,7 +481,7 @@ void sqlite3VXPrintf(
}
}
zOut = bufpt;
nsd = 0;
nsd = 16 + flag_altform2*10;
flag_dp = (precision>0 ?1:0) | flag_alternateform | flag_altform2;
/* The sign in front of the number */
if( prefix ){