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LibC: Fix locale handling in wcrtomb and mbrtowc

This commit is contained in:
Bananymous 2025-06-16 15:09:39 +03:00
parent cdcd226b1a
commit 7ff7a4aa87
1 changed files with 48 additions and 9 deletions
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57
userspace/libraries/LibC/wchar.cpp
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@ -28,18 +28,28 @@ size_t wcrtomb(char* __restrict s, wchar_t ws, mbstate_t* __restrict ps)
{
(void)ps;
// ws == '\0' doesn't seem to apply to UTF8?
// ws == '\0' doesn't seem to apply to UTF8/ASCII?
if (s == nullptr)
return 1;
if (!BAN::UTF8::from_codepoints(&ws, 1, s))
switch (__getlocale(LC_CTYPE))
{
errno = EILSEQ;
return -1;
case locale_t::LOCALE_INVALID:
ASSERT_NOT_REACHED();
case locale_t::LOCALE_POSIX:
if (ws > 0x7F)
break;
*s = ws;
return 1;
case locale_t::LOCALE_UTF8:
if (!BAN::UTF8::from_codepoints(&ws, 1, s))
break;
return BAN::UTF8::byte_length(s[0]);
}
return BAN::UTF8::byte_length(s[0]);
errno = EILSEQ;
return -1;
}
size_t mbrtowc(wchar_t* __restrict pwc, const char* __restrict s, size_t n, mbstate_t* __restrict ps)
@ -49,17 +59,46 @@ size_t mbrtowc(wchar_t* __restrict pwc, const char* __restrict s, size_t n, mbst
if (s == nullptr)
return 0;
const auto bytes = BAN::UTF8::byte_length(*s);
if (bytes == BAN::UTF8::invalid)
const auto locale = __getlocale(LC_CTYPE);
size_t bytes = -1;
switch (locale)
{
case locale_t::LOCALE_INVALID:
ASSERT_NOT_REACHED();
case locale_t::LOCALE_POSIX:
bytes = 1;
break;
case locale_t::LOCALE_UTF8:
if (auto b = BAN::UTF8::byte_length(s[0]); b != BAN::UTF8::invalid)
bytes = b;
break;
}
if (bytes == static_cast<size_t>(-1))
{
errno = EILSEQ;
return -1;
}
if (n < bytes)
return -1;
const auto codepoint = BAN::UTF8::to_codepoint(s);
if (codepoint == BAN::UTF8::invalid)
wchar_t codepoint = WEOF;
switch (locale)
{
case locale_t::LOCALE_INVALID:
ASSERT_NOT_REACHED();
case locale_t::LOCALE_POSIX:
codepoint = s[0];
break;
case locale_t::LOCALE_UTF8:
if (auto cp = BAN::UTF8::to_codepoint(s); cp != BAN::UTF8::invalid)
codepoint = cp;
break;
}
if (codepoint == WEOF)
{
errno = EILSEQ;
return -1;