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AK: Refactor FixedPoint's formatter

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The main change is the simplification of the expression
`(10^precision * fraction) / 2^precision` to `5^precision * fraction`.

Those expressions overflow or not depends on the value of `precision`
and `fraction`. For the maximum value of `fraction`, the following table
shows for which value of `precision` overflow will occur.

            Old   New
    u32      08    10
    u64      15    20
    u128     30    39

As of now `u64` type is used to calculate the result of the expression.
Meaning that before, only FixedPoints with `precision` less than 15
could be accurately rendered (for every value of fraction) in decimal.
Now, this limit gets increased to 20.

This refactor also fixes, broken decimal render for explicitly specified
precision width in format string, and broken hexadecimal render.
This commit is contained in:
ronak69 2023-08-13 15:34:00 +00:00 • committed by Andrew Kaster
parent d40807681d
commit 352480338e
4 changed files with 147 additions and 53 deletions
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6
AK/Format.h
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@ -214,16 +214,16 @@ public:
i64 integer_value,
u64 fraction_value,
u64 fraction_one,
size_t precision,
u8 base = 10,
bool upper_case = false,
bool zero_pad = false,
bool use_separator = false,
Align align = Align::Right,
size_t min_width = 0,
size_t precision = 6,
size_t fraction_max_width = 6,
char fill = ' ',
SignMode sign_mode = SignMode::OnlyIfNeeded,
RealNumberDisplayMode = RealNumberDisplayMode::Default);
SignMode sign_mode = SignMode::OnlyIfNeeded);
#ifndef KERNEL
ErrorOr<void> put_f80(