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LibC: Fix printf %g modifier

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Apparently I had missed like half of the features it was supposed to do
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Bananymous
2026-07-04 04:49:44 +03:00
parent 0d8d731d91
commit e717b95df0
1 changed files with 37 additions and 7 deletions
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44
userspace/libraries/LibC/printf_impl.cpp
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@@ -262,14 +262,44 @@ static void floating_point_to_exponent_string(char* buffer, T value, bool upper,
template<BAN::floating_point T>
static void floating_point_to_maybe_exponent_string(char* buffer, T value, bool upper, const format_options_t options)
{
int percision = 6;
if (options.percision != -1)
percision = options.percision;
int percision = options.percision;
if (percision == -1)
percision = 6;
if (percision == 0)
percision = 1;
const int exponent = (value != static_cast<T>(0.0)) ? BAN::Math::floor<T>(BAN::Math::log10(value)) : 0;
if (exponent < -4 || exponent >= percision)
return floating_point_to_exponent_string(buffer, value, upper, options);
return floating_point_to_string(buffer, value, upper, options);
int exponent = 0;
if (value > (T)0.0)
exponent = +BAN::Math::floor<T>(BAN::Math::log10(BAN::Math::abs(+value)));
else if (value < (T)0.0)
exponent = -BAN::Math::floor<T>(BAN::Math::log10(BAN::Math::abs(-value)));
char* frac_end;
format_options_t new_options = options;
if (percision > exponent && exponent >= -4)
{
new_options.percision = percision - (exponent + 1);
floating_point_to_string(buffer, value, upper, new_options);
frac_end = buffer + strlen(buffer) - 1;
}
else
{
new_options.percision = percision - 1;
floating_point_to_exponent_string(buffer, value, upper, new_options);
frac_end = strchr(buffer, upper ? 'E' : 'e') - 1;
}
// do not trim fractional part in alternate mode
// if percision is 0, there is no fractional part
if (new_options.alternate_form || new_options.percision == 0)
return;
char* ptr = frac_end;
while (*ptr == '0')
ptr--;
if (*ptr == '.')
ptr--;
strcpy(ptr, frac_end);
}
extern "C" int printf_impl(const char* format, va_list arguments, int (*putc_fun)(int, void*), void* data)