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Allow UnityPrintFloat() to print a 7th digit.

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This commit is contained in:
John Lindgren
2017-09-14 13:47:04 -04:00
parent 774da10e00
commit 8ff74d6000
2 changed files with 102 additions and 61 deletions
src
unity.c
test/tests
testunity.c

49
src/unity.c

@ -258,11 +258,14 @@ void UnityPrintMask(const UNITY_UINT mask, const UNITY_UINT number)
/*-----------------------------------------------*/
#ifndef UNITY_EXCLUDE_FLOAT_PRINT
/* This function prints a floating-point value in a format similar to
* printf("%.6g"). It can work with either single- or double-precision,
* but for simplicity, it prints only 6 significant digits in either case.
* Printing more than 6 digits accurately is hard (at least in the single-
* precision case) and isn't attempted here. */
/*
* This function prints a floating-point value in a format similar to
* printf("%.7g"). It can work with either single- or double-precision,
* but for simplicity, it prints only 7 significant digits in either case.
* The 7th digit won't always be totally correct in single-precision
* operation (for that level of accuracy, a more complicated algorithm
* would be needed).
*/
void UnityPrintFloat(const UNITY_DOUBLE input_number)
{
UNITY_DOUBLE number = input_number;
@ -285,22 +288,42 @@ void UnityPrintFloat(const UNITY_DOUBLE input_number)
UNITY_INT32 n;
char buf[16];
/* scale up or down by powers of 10 */
while (number < 100000.0f / 1e6f) { number *= 1e6f; exponent -= 6; }
while (number < 100000.0f) { number *= 10.0f; exponent--; }
while (number > 1000000.0f * 1e6f) { number /= 1e6f; exponent += 6; }
while (number > 1000000.0f) { number /= 10.0f; exponent++; }
/*
* Scale up or down by powers of 10. To minimize rounding error,
* start with a factor/divisor of 10^10, which is the largest
* power of 10 that can be represented exactly. Finally, compute
* (exactly) the remaining power of 10 and perform one more
* multiplication or division.
*/
if(number < 1e6f)
{
UNITY_DOUBLE factor = 1.0f;
while(number < 1e7f / 1e10f) { number *= 1e10f; exponent -= 10; }
while(number * factor < 1e6f) { factor *= 10.0f; exponent--; }
number *= factor;
}
else if(number > 1e7f)
{
UNITY_DOUBLE divisor = 1.0f;
while(number > 1e6f * 1e10f) { number /= 1e10f; exponent += 10; }
while(number / divisor > 1e7f) { divisor *= 10.0f; exponent++; }
number /= divisor;
}
/* round to nearest integer */
n = ((UNITY_INT32)(number + number) + 1) / 2;
if (n > 999999)
if (n > 9999999)
{
n = 100000;
n = 1000000;
exponent++;
}
/* determine where to place decimal point */
decimals = (exponent <= 0 && exponent >= -9) ? -exponent : 5;
decimals = (exponent <= 0 && exponent >= -10) ? -exponent : 6;
exponent += decimals;
/* truncate trailing zeroes after decimal point */

114
test/tests/testunity.c

@ -4466,46 +4466,48 @@ void testFloatPrinting(void)
#if defined(UNITY_EXCLUDE_FLOAT_PRINT) || !defined(USING_OUTPUT_SPY)
TEST_IGNORE();
#else
/* Some failures are expected due to differences in the last digit
* if UnityPrintFloat uses single-precision calculations. */
TEST_ASSERT_EQUAL_PRINT_FLOATING("0", 0.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.99e-07", 0.000000499f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("5e-07", 0.00000050000005f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("0.100469", 0.100469499f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1", 0.9999995f); /*Rounding to int place*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("5e-07", 0.0000005f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("0.1004695", 0.1004695f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("2", 1.9999995f); /*Rounding to int place*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("1", 1.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1.25", 1.25f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("7.99999", 7.99999f); /*Not rounding*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("16.0002", 16.0002f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("16.0004", 16.0004f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("16.0006", 16.0006f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("999999", 999999.0f); /*Last full print integer*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("7.999999", 7.999999f); /*Not rounding*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("16.00002", 16.00002f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("16.00004", 16.00004f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("16.00006", 16.00006f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("9999999", 9999999.0f); /*Last full print integer*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("-0", -0.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-4.99e-07", -0.000000499f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-5e-07", -0.00000050000005f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-0.100469", -0.100469499f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-1", -0.9999995f); /*Rounding to int place*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("-5e-07", -0.0000005f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-0.1004695", -0.1004695f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-2", -1.9999995f); /*Rounding to int place*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("-1", -1.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-1.25", -1.25f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-7.99999", -7.99999f); /*Not rounding*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("-16.0002", -16.0002f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-16.0004", -16.0004f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-16.0006", -16.0006f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-999999", -999999.0f); /*Last full print integer*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("-7.999999", -7.999999f); /*Not rounding*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("-16.00002", -16.00002f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-16.00004", -16.00004f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-16.00006", -16.00006f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-9999999", -9999999.0f); /*Last full print integer*/
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.29497e+09", 4294967296.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("5e+09", 5000000000.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("8e+09", 8.0e+09f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("8.31e+09", 8309999104.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1e+10", 1.0e+10f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1e+10", 10000000000.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.294967e+09", 4294967296.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("5e+09", 5000000000.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("8e+09", 8.0e+09f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("8.309999e+09", 8309999104.0f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1e+10", 1.0e+10f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1e+10", 10000000000.0f);
/* Some compilers have trouble with inexact float constants, a float cast works generally */
TEST_ASSERT_EQUAL_PRINT_FLOATING("1.00005e+10", (float)1.000054e+10f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1.1e+38", (float)1.10000005e+38f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1.6353e+10", 1.63529943e+10f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("3.40282e+38", 3.40282346638e38f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1.000055e+10", (float)1.000055e+10f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1.1e+38", (float)1.10000005e+38f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1.635299e+10", 1.63529943e+10f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("3.402823e+38", 3.40282346638e38f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-1e+10", -1.0e+10f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-3.40282e+38", -3.40282346638e38f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-1e+10", -1.0e+10f);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-3.402823e+38", -3.40282346638e38f);
#endif
}
@ -4526,27 +4528,43 @@ static void printFloatValue(float f)
{
char expected[18];
char expected_lower[18];
char expected_lower2[18];
char expected_lower3[18];
char expected_higher[18];
char expected_higher2[18];
char expected_higher3[18];
startPutcharSpy();
UnityPrintFloat(f);
sprintf(expected, "%.6g", f);
sprintf(expected, "%.7g", f);
/* We print all NaN's as "nan", not "-nan" */
if(strcmp(expected, "-nan") == 0) strcpy(expected, "nan");
/* Allow for rounding differences in last digit */
double lower = (double)f * 0.9999995;
double higher = (double)f * 1.0000005;
/* Allow for relative error of +/-2.5e-7 */
double lower = (double)f * 0.99999995;
double lower2 = (double)f * 0.99999985;
double lower3 = (double)f * 0.99999975;
double higher = (double)f * 1.00000005;
double higher2 = (double)f * 1.00000015;
double higher3 = (double)f * 1.00000025;
if (isfinite(lower)) sprintf(expected_lower, "%.6g", lower); else strcpy(expected_lower, expected);
if (isfinite(higher)) sprintf(expected_higher, "%.6g", higher); else strcpy(expected_higher, expected);
if(isfinite(lower)) sprintf(expected_lower, "%.7g", lower); else strcpy(expected_lower, expected);
if(isfinite(lower2)) sprintf(expected_lower2, "%.7g", lower2); else strcpy(expected_lower2, expected);
if(isfinite(lower3)) sprintf(expected_lower3, "%.7g", lower3); else strcpy(expected_lower3, expected);
if(isfinite(higher)) sprintf(expected_higher, "%.7g", higher); else strcpy(expected_higher, expected);
if(isfinite(higher2)) sprintf(expected_higher2, "%.7g", higher2); else strcpy(expected_higher2, expected);
if(isfinite(higher3)) sprintf(expected_higher3, "%.7g", higher3); else strcpy(expected_higher3, expected);
if (strcmp(expected, getBufferPutcharSpy()) != 0 &&
strcmp(expected_lower, getBufferPutcharSpy()) != 0 &&
strcmp(expected_higher, getBufferPutcharSpy()) != 0)
strcmp(expected_lower2, getBufferPutcharSpy()) != 0 &&
strcmp(expected_lower3, getBufferPutcharSpy()) != 0 &&
strcmp(expected_higher, getBufferPutcharSpy()) != 0 &&
strcmp(expected_higher2, getBufferPutcharSpy()) != 0 &&
strcmp(expected_higher3, getBufferPutcharSpy()) != 0)
{
/* Fail with diagnostic printing */
TEST_ASSERT_EQUAL_PRINT_FLOATING(expected, f);
@ -5252,20 +5270,20 @@ void testDoublePrinting(void)
#if defined(UNITY_EXCLUDE_FLOAT_PRINT) || defined(UNITY_EXCLUDE_DOUBLE) || !defined(USING_OUTPUT_SPY)
TEST_IGNORE();
#else
TEST_ASSERT_EQUAL_PRINT_FLOATING("0.100469", 0.10046949999999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.29497e+09", 4294967295.999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.29497e+09", 4294967295.9999995);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.29497e+09", 4294967296.0);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1e+10", 9999999995.0);
TEST_ASSERT_EQUAL_PRINT_FLOATING("9.0072e+15", 9007199254740990.0);
TEST_ASSERT_EQUAL_PRINT_FLOATING("7e+100", 7.0e+100);
TEST_ASSERT_EQUAL_PRINT_FLOATING("3e+200", 3.0e+200);
TEST_ASSERT_EQUAL_PRINT_FLOATING("9.23457e+300", 9.23456789e+300);
TEST_ASSERT_EQUAL_PRINT_FLOATING("0.1004695", 0.10046949999999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.294967e+09", 4294967295.999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.294967e+09", 4294967295.9999995);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.294967e+09", 4294967296.0);
TEST_ASSERT_EQUAL_PRINT_FLOATING("1e+10", 9999999995.0);
TEST_ASSERT_EQUAL_PRINT_FLOATING("9.007199e+15", 9007199254740990.0);
TEST_ASSERT_EQUAL_PRINT_FLOATING("7e+100", 7.0e+100);
TEST_ASSERT_EQUAL_PRINT_FLOATING("3e+200", 3.0e+200);
TEST_ASSERT_EQUAL_PRINT_FLOATING("9.234568e+300", 9.23456789e+300);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-0.100469", -0.10046949999999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-4.29497e+09", -4294967295.999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-4.29497e+09", -4294967295.9999995);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-7e+100", -7.0e+100);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-0.1004695", -0.10046949999999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-4.294967e+09", -4294967295.999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-4.294967e+09", -4294967295.9999995);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-7e+100", -7.0e+100);
#endif
}