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AK: Add a human_readable_quantity helper to NumberFormat.h

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This can be used for displaying large quantities that are not measured
in bytes in a more human-readable format.
This commit is contained in:
Arda Cinar 2022-12-10 12:01:10 +03:00 committed by Sam Atkins
parent 3e924e2a37
commit c8fadff9b1
Notes: sideshowbarker 2024-07-17 03:30:41 +09:00 
Author: https://github.com/kuzux
Commit: https://github.com/SerenityOS/serenity/commit/c8fadff9b1
Pull-request: https://github.com/SerenityOS/serenity/pull/16410
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/LucasChollet
Reviewed-by: https://github.com/ldm5180
2 changed files with 36 additions and 14 deletions
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46
AK/NumberFormat.cpp
View file

@ -4,32 +4,50 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/DeprecatedString.h>
#include <AK/NumberFormat.h>
#include <AK/StringView.h>
namespace AK {
// FIXME: Remove this hackery once printf() supports floats.
static DeprecatedString number_string_with_one_decimal(u64 number, u64 unit, char const* suffix)
static DeprecatedString number_string_with_one_decimal(u64 number, u64 unit, StringView suffix)
{
int decimal = (number % unit) * 10 / unit;
return DeprecatedString::formatted("{}.{} {}", number / unit, decimal, suffix);
}
DeprecatedString human_readable_quantity(u64 quantity, StringView unit)
{
constexpr u64 size_of_unit = 1024;
constexpr auto unit_prefixes = AK::Array { "", "K", "M", "G", "T", "P", "E" };
auto full_unit_suffix = [&](int index) {
auto binary_infix = (size_of_unit == 1024 && index != 0) ? "i"sv : ""sv;
return DeprecatedString::formatted("{}{}{}",
unit_prefixes[index], binary_infix, unit);
};
auto size_of_current_unit = size_of_unit;
if (quantity < size_of_unit)
return DeprecatedString::formatted("{} {}", quantity, full_unit_suffix(0));
for (size_t i = 1; i < unit_prefixes.size() - 1; i++) {
auto suffix = full_unit_suffix(i);
if (quantity < size_of_unit * size_of_current_unit) {
return number_string_with_one_decimal(quantity, size_of_current_unit, suffix);
}
size_of_current_unit *= size_of_unit;
}
return number_string_with_one_decimal(quantity,
size_of_current_unit, full_unit_suffix(unit_prefixes.size() - 1));
}
DeprecatedString human_readable_size(u64 size)
{
if (size < 1 * KiB)
return DeprecatedString::formatted("{} B", size);
if (size < 1 * MiB)
return number_string_with_one_decimal(size, KiB, "KiB");
if (size < 1 * GiB)
return number_string_with_one_decimal(size, MiB, "MiB");
if (size < 1 * TiB)
return number_string_with_one_decimal(size, GiB, "GiB");
if (size < 1 * PiB)
return number_string_with_one_decimal(size, TiB, "TiB");
if (size < 1 * EiB)
return number_string_with_one_decimal(size, PiB, "PiB");
return number_string_with_one_decimal(size, EiB, "EiB");
return human_readable_quantity(size, "B"sv);
}
DeprecatedString human_readable_size_long(u64 size)

4
AK/NumberFormat.h
View file

@ -10,7 +10,10 @@
namespace AK {
// TODO: Add an optional base here for binary vs si units
DeprecatedString human_readable_size(u64 size);
DeprecatedString human_readable_quantity(u64 quantity, StringView unit = "B"sv);
DeprecatedString human_readable_size_long(u64 size);
DeprecatedString human_readable_time(i64 time_in_seconds);
DeprecatedString human_readable_digital_time(i64 time_in_seconds);
@ -19,6 +22,7 @@ DeprecatedString human_readable_digital_time(i64 time_in_seconds);
#if USING_AK_GLOBALLY
using AK::human_readable_digital_time;
using AK::human_readable_quantity;
using AK::human_readable_size;
using AK::human_readable_size_long;
using AK::human_readable_time;