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printf: fix negative floating point numbers

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This commit is contained in:
Zack Buhman 2025-05-24 13:11:33 -05:00
parent 34eeda47be
commit 6deabe56cf
1 changed files with 6 additions and 4 deletions
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10
printf/printf.c
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@ -174,15 +174,17 @@ void _printf(const char * format, ...)
case FORMAT_FLOAT:
{
double num = va_arg(args, double);
if (num < 0) {
print_char('-');
num = -num;
}
char s[20];
int32_t whole = num;
int offset = unparse_base10(s, whole, ft.pad_length, ft.fill_char);
int offset = unparse_base10_unsigned(s, whole, ft.pad_length, ft.fill_char);
print_string(s, offset);
print_char('.');
int32_t fraction = (int32_t)((num - (float)whole) * 1000.0);
if (fraction < 0)
fraction = -fraction;
offset = unparse_base10(s, fraction, 0, 0);
offset = unparse_base10_unsigned(s, fraction, 0, 0);
print_string(s, offset);
}
break;