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(trunk libT) #3521 "rounding issue in tr_truncd()" -- try yet again to work out all the fringe cases :)

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Charles Kerr 2010-10-21 23:47:23 +00:00
parent 1c2a7359af
commit 2ee5b08e94
2 changed files with 21 additions and 7 deletions
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11
libtransmission/utils-test.c
View file

@ -1,3 +1,4 @@
#include <math.h>
#include <stdio.h> /* fprintf */
#include <string.h> /* strcmp */
@ -379,6 +380,7 @@ static int
test_truncd( void )
{
char buf[32];
const double nan = sqrt( -1 );
tr_snprintf( buf, sizeof( buf ), "%.2f%%", 99.999 );
check( !strcmp( buf, "100.00%" ) );
@ -395,6 +397,15 @@ test_truncd( void )
tr_snprintf( buf, sizeof( buf ), "%.2f", tr_truncd( 2.05, 2 ) );
check( !strcmp( buf, "2.05" ) );
tr_snprintf( buf, sizeof( buf ), "%.2f", tr_truncd( 3.3333, 2 ) );
check( !strcmp( buf, "3.33" ) );
tr_snprintf( buf, sizeof( buf ), "%.0f", tr_truncd( 3.3333, 0 ) );
check( !strcmp( buf, "3" ) );
tr_snprintf( buf, sizeof( buf ), "%.2f", tr_truncd( nan, 2 ) );
check( !strcmp( buf, "nan" ) );
return 0;
}

17
libtransmission/utils.c
View file

@ -24,6 +24,8 @@
#include <assert.h>
#include <ctype.h> /* isalpha(), tolower() */
#include <errno.h>
#include <float.h> /* DBL_EPSILON */
#include <locale.h> /* localeconv() */
#include <math.h> /* pow(), fabs(), floor() */
#include <stdarg.h>
#include <stdio.h>
@ -1431,14 +1433,15 @@ tr_parseNumberRange( const char * str_in, int len, int * setmeCount )
***/
double
tr_truncd( double x, int decimal_places )
tr_truncd( double x, int precision )
{
/* sigh... surely there's a better way to do this */
char buf[1024];
const int i = (int) pow( 10, decimal_places );
snprintf( buf, sizeof( buf ), "%f", x*i );
*strchr(buf,'.') = '\0';
return atof(buf) / i;
char * pt;
char buf[128];
const int max_precision = (int) log10( 1.0 / DBL_EPSILON ) - 1;
tr_snprintf( buf, sizeof( buf ), "%.*f", max_precision, x );
if(( pt = strstr( buf, localeconv()->decimal_point )))
pt[precision ? precision+1 : 0] = '\0';
return atof(buf);
}
char*