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AK+Format: Do some housekeeping in the format implementation.
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13 changed files with 476 additions and 640 deletions
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@ -38,172 +38,6 @@ namespace PrintfImplementation {
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static constexpr const char* printf_hex_digits_lower = "0123456789abcdef";
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static constexpr const char* printf_hex_digits_upper = "0123456789ABCDEF";
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enum class Align {
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Left,
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Center,
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Right,
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};
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enum class SignMode {
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OnlyIfNeeded,
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Always,
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Reserved
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};
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// The worst case is that we have the largest 64-bit value formatted as binary number, this would take
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// 65 bytes. Choosing a larger power of two won't hurt and is a bit of mitigation against out-of-bounds accesses.
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inline size_t convert_unsigned_to_string(u64 value, Array<u8, 128>& buffer, u8 base, bool upper_case)
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{
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ASSERT(base >= 2 && base <= 16);
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static constexpr const char* lowercase_lookup = "0123456789abcdef";
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static constexpr const char* uppercase_lookup = "0123456789ABCDEF";
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if (value == 0) {
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buffer[0] = '0';
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return 1;
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}
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size_t used = 0;
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while (value > 0) {
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if (upper_case)
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buffer[used++] = uppercase_lookup[value % base];
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else
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buffer[used++] = lowercase_lookup[value % base];
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value /= base;
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}
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// Reverse the list; I came up with this logic in like three seconds so it's probably wrong in some edge case.
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for (size_t i = 0; i < used / 2; ++i)
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swap(buffer[i], buffer[used - i - 1]);
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return used;
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}
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inline size_t convert_unsigned_to_string(
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u64 value,
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StringBuilder& builder,
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u8 base = 10,
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bool prefix = false,
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bool upper_case = false,
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bool zero_pad = false,
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Align align = Align::Right,
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size_t width = 0,
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char fill = ' ',
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SignMode sign_mode = SignMode::OnlyIfNeeded,
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bool is_negative = false)
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{
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Array<u8, 128> buffer;
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const auto used_by_significant_digits = convert_unsigned_to_string(value, buffer, base, upper_case);
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size_t used_by_prefix = sign_mode == SignMode::OnlyIfNeeded ? static_cast<size_t>(is_negative) : 1;
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if (prefix) {
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if (base == 8)
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used_by_prefix += 1;
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else if (base == 16)
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used_by_prefix += 2;
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else if (base == 2)
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used_by_prefix += 2;
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}
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const auto put_prefix = [&]() {
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if (is_negative)
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builder.append('-');
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else if (sign_mode == SignMode::Always)
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builder.append('+');
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else if (sign_mode == SignMode::Reserved)
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builder.append(' ');
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if (prefix) {
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if (base == 2) {
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if (upper_case)
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builder.append("0B");
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else
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builder.append("0b");
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} else if (base == 8) {
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builder.append("0");
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} else if (base == 16) {
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if (upper_case)
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builder.append("0X");
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else
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builder.append("0x");
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}
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}
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};
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const auto put_padding = [&](size_t amount, char fill) {
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for (size_t i = 0; i < amount; ++i)
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builder.append(fill);
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};
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const auto put_digits = [&]() {
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builder.append(StringView { buffer.span().trim(used_by_significant_digits) });
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};
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const auto used_by_field = used_by_significant_digits + used_by_prefix;
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const auto used_by_padding = width < used_by_field ? 0 : width - used_by_field;
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if (align == Align::Left) {
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const auto used_by_right_padding = used_by_padding;
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put_prefix();
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put_digits();
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put_padding(used_by_right_padding, fill);
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return used_by_field + used_by_right_padding;
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}
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if (align == Align::Center) {
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const auto used_by_left_padding = used_by_padding / 2;
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const auto used_by_right_padding = ceil_div<size_t, size_t>(used_by_padding, 2);
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put_padding(used_by_left_padding, fill);
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put_prefix();
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put_digits();
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put_padding(used_by_right_padding, fill);
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return used_by_left_padding + used_by_field + used_by_right_padding;
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}
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if (align == Align::Right) {
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const auto used_by_left_padding = used_by_padding;
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if (zero_pad) {
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put_prefix();
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put_padding(used_by_left_padding, '0');
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put_digits();
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} else {
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put_padding(used_by_left_padding, fill);
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put_prefix();
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put_digits();
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}
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return used_by_field + used_by_left_padding;
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}
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ASSERT_NOT_REACHED();
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}
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inline size_t convert_signed_to_string(
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i64 value,
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StringBuilder& builder,
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u8 base = 10,
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bool common_prefix = false,
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bool upper_case = false,
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bool zero_pad = false,
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Align align = Align::Right,
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size_t width = 0,
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char fill = ' ',
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SignMode sign_mode = SignMode::OnlyIfNeeded)
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{
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bool is_negative = value < 0;
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if (value < 0)
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value = -value;
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return convert_unsigned_to_string(static_cast<size_t>(value), builder, base, common_prefix, upper_case, zero_pad, align, width, fill, sign_mode, is_negative);
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}
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#ifdef __serenity__
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extern "C" size_t strlen(const char*);
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#else
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