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float fractional part printing fixed

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This commit is contained in:
Wiesner András 2022-10-03 10:28:35 +02:00
parent a4ff669e7b
commit 15a6bc0ef7
1 changed files with 16 additions and 3 deletions
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19
embformat.c
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@ -280,12 +280,25 @@ static int pfn_double(va_list *va, FmtWord *fmt, char *outbuf, size_t free_space
*outbuf = '\0';
// prepare format for
// prepare format for printing fractional part
FmtWord frac_fmt = { .flags = FLAG_NO, .width = -1, .type = UNSIGNED_INTEGER };
// extract fractional part as integer
// get "leading zeros" in fractional part
double d_frac = d - (double) int_part;
d_frac *= (double) power(10, fmt->precision + 1); // get one more digit
// print leading zeros
int leading_zeros_printed = 0;
while ((d_frac * 10.0) < 1.0 && leading_zeros_printed < fmt->precision) {
d_frac *= 10.0;
*outbuf = '0';
outbuf++;
free_space--;
*outbuf = '\0';
leading_zeros_printed++;
}
// extract fractional part as integer
d_frac *= (double) power(10, fmt->precision - leading_zeros_printed + 1); // get one more digit
uint64_t frac_part = (uint64_t) d_frac;
frac_part = round_to_base(frac_part, 10) / 10; // remove last zero digit (result of rounding)