void test_SingleDecimalRounding(void)
{
s_fp test = (2 << 16) + (1 << 14)*3; // 2 + 0.25*3 = 2.75
TEST_ASSERT_EQUAL_STRING("2.8", fptoa(test, 1));
TEST_ASSERT_EQUAL_STRING("2750.0", fptoms(test, 1));
}
void test_NegativeIntegerPositiveFraction(void)
{
s_fp test = (-200 << 16) + (1 << 14)*3; // -200 + 0.75
TEST_ASSERT_EQUAL_STRING("-199.250000", fptoa(test, SFP_MAX_PRECISION));
TEST_ASSERT_EQUAL_STRING("-199250.000", fptoms(test, SFP_MAX_PRECISION));
}
void test_SingleDecimalInteger(void)
{
s_fp test = 300 << 16; // 300
TEST_ASSERT_EQUAL_STRING("300.0", fptoa(test, 1));
TEST_ASSERT_EQUAL_STRING("300000.0", fptoms(test, 1));
}
void test_PositiveIntegerNegativeFraction(void)
{
s_fp test = (300 << 16) - (1 << 14); // 300 - 0.25
TEST_ASSERT_EQUAL_STRING("299.750000", fptoa(test, SFP_MAX_PRECISION));
TEST_ASSERT_EQUAL_STRING("299750.000", fptoms(test, SFP_MAX_PRECISION));
}
void test_NegativeIntegerNegativeFraction(void)
{
s_fp test = (-200 << 16) - (1 << 15); // -200 - 0.5
TEST_ASSERT_EQUAL_STRING("-200.500000", fptoa(test, SFP_MAX_PRECISION));
TEST_ASSERT_EQUAL_STRING("-200500.000", fptoms(test, SFP_MAX_PRECISION));
}
void test_PositiveIntegerPositiveFraction(void)
{
s_fp test = (300 << 16) + (1 << 15); // 300 + 0.5
TEST_ASSERT_EQUAL_STRING("300.500000", fptoa(test, SFP_MAX_PRECISION));
TEST_ASSERT_EQUAL_STRING("300500.000", fptoms(test, SFP_MAX_PRECISION));
}
void test_NegativeInteger(void)
{
s_fp test = -200 << 16; // exact -200.000000
TEST_ASSERT_EQUAL_STRING("-200.000000", fptoa(test, SFP_MAX_PRECISION));
TEST_ASSERT_EQUAL_STRING("-200000.000", fptoms(test, SFP_MAX_PRECISION));
}
void test_PositiveInteger(void)
{
s_fp test = 300 << 16; // exact 300.000000
TEST_ASSERT_EQUAL_STRING("300.000000", fptoa(test, SFP_MAX_PRECISION));
TEST_ASSERT_EQUAL_STRING("300000.000", fptoms(test, SFP_MAX_PRECISION));
}
/*
* best float to string (lib)
*
* This is the real float-to-string routine.
* It used by the routines:
* bestfta(double x, char *dest)
* expfta(double x, char *dest)
*/
void bestfta_p(var_num_t x, char *dest, var_num_t minx, var_num_t maxx) {
var_num_t ipart, fpart, fdif;
var_int_t power = 0;
int sign, i;
char *d = dest;
char buf[64];
memset(buf, 0, sizeof(buf));
if (fabs(x) == 0.0) {
strcpy(dest, "0");
return;
}
// find sign
sign = sgn(x);
if (sign < 0) {
*d++ = '-';
}
x = fabs(x);
if (x >= 1E308) {
*d = '\0';
strcat(d, WORD_INF);
return;
} else if (x <= 1E-307) {
*d = '\0';
strcat(d, "0");
return;
}
// find power
if (x < minx) {
for (i = 37; i >= 0; i--) {
if (x < nfta_eminus[i]) {
x *= nfta_eplus[i];
power = -((i + 1) * 8);
} else {
break;
}
}
while (x < 1.0 && power > -307) {
x *= 10.0;
power--;
}
} else if (x > maxx) {
for (i = 37; i >= 0; i--) {
if (x > nfta_eplus[i]) {
x /= nfta_eplus[i];
power = ((i + 1) * 8);
} else {
break;
}
}
while (x >= 10.0 && power < 308) {
x /= 10.0;
power++;
}
}
// format left part
ipart = fabs(fint(x));
fpart = fround(frac(x), FMT_RND) * FMT_xRND;
if (fpart >= FMT_xRND) { // rounding bug
ipart = ipart + 1.0;
if (ipart >= maxx) {
ipart = ipart / 10.0;
power++;
}
fpart = 0.0;
}
fptoa(ipart, buf);
strcpy(d, buf);
d += strlen(buf);
if (fpart > 0.0) {
// format right part
*d++ = '.';
fdif = frac(x) * FMT_xRND;
if (fdif < fpart) {
// rounded value has greater precision
fdif = fpart;
}
while (fdif < FMT_xRND2) {
fdif *= 10;
*d++ = '0';
}
fptoa(rmzeros(fpart), buf);
strcpy(d, buf);
d += strlen(buf);
}
if (power) {
// add the power
*d++ = 'E';
if (power > 0) {
*d++ = '+';
}
fptoa(power, buf);
strcpy(d, buf);
d += strlen(buf);
}
// finish
*d = '\0';
}