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LibC: Implement wcrtomb

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This function converts a single wide character into its multibyte
representation (UTF-8 in our case). It is called from libc++'s
`std::basic_ostream<wchar_t>::flush`, which gets called at program exit
from a global destructor in order to flush `std::wcout`.
This commit is contained in:
Daniel Bertalan 2021-10-04 16:59:13 +02:00 • committed by Brian Gianforcaro
parent 9c29e6cde7
commit c8367df746
3 changed files with 72 additions and 3 deletions
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25
AK/UnicodeUtils.h
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@ -17,4 +17,29 @@ constexpr bool is_unicode_control_code_point(u32 code_point)
Optional<StringView> get_unicode_control_code_point_alias(u32);
template<typename Callback>
[[nodiscard]] constexpr int code_point_to_utf8(u32 code_point, Callback callback)
{
if (code_point <= 0x7f) {
callback((char)code_point);
return 1;
} else if (code_point <= 0x07ff) {
callback((char)(((code_point >> 6) & 0x1f) | 0xc0));
callback((char)(((code_point >> 0) & 0x3f) | 0x80));
return 2;
} else if (code_point <= 0xffff) {
callback((char)(((code_point >> 12) & 0x0f) | 0xe0));
callback((char)(((code_point >> 6) & 0x3f) | 0x80));
callback((char)(((code_point >> 0) & 0x3f) | 0x80));
return 3;
} else if (code_point <= 0x10ffff) {
callback((char)(((code_point >> 18) & 0x07) | 0xf0));
callback((char)(((code_point >> 12) & 0x3f) | 0x80));
callback((char)(((code_point >> 6) & 0x3f) | 0x80));
callback((char)(((code_point >> 0) & 0x3f) | 0x80));
return 4;
}
return -1;
}
}