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LibC: Implement mbtowc

This commit is contained in:
Bananymous 2025-07-30 00:28:17 +03:00
parent 66fe2f2e50
commit 07e4e764a0
1 changed files with 39 additions and 0 deletions
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39
userspace/libraries/LibC/stdlib.cpp
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@ -570,6 +570,45 @@ int mblen(const char* s, size_t n)
ASSERT_NOT_REACHED();
}
int mbtowc(wchar_t* __restrict pwc, const char* __restrict s, size_t n)
{
// no state-dependent encodings
if (s == nullptr)
return 0;
switch (__getlocale(LC_CTYPE))
{
case LOCALE_INVALID:
ASSERT_NOT_REACHED();
case LOCALE_POSIX:
if (pwc != nullptr)
*pwc = *s;
return *s ? 1 : 0;
case LOCALE_UTF8:
const auto* us = reinterpret_cast<const unsigned char*>(s);
const uint32_t length = BAN::UTF8::byte_length(*us);
if (length == BAN::UTF8::invalid || n < length)
{
errno = EILSEQ;
return -1;
}
const auto wch = BAN::UTF8::to_codepoint(us);
if (wch == BAN::UTF8::invalid)
{
errno = EILSEQ;
return -1;
}
if (pwc)
*pwc = wch;
return wch ? length : 0;
}
ASSERT_NOT_REACHED();
}
size_t mbstowcs(wchar_t* __restrict pwcs, const char* __restrict s, size_t n)
{
size_t written = 0;