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LibC: Fix up mbtowc

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One more proper implementation and one less FIXME.
This commit is contained in:
Tim Schumacher 2021-10-22 00:04:39 +02:00 • committed by Brian Gianforcaro
parent 1bc4a0d822
commit 8df6955838
2 changed files with 56 additions and 8 deletions
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23
Userland/Libraries/LibC/stdlib.cpp
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@ -884,19 +884,26 @@ size_t mbstowcs(wchar_t* pwcs, const char* s, size_t n)
return mbsrtowcs(pwcs, &s, n, &state);
}
int mbtowc(wchar_t* wch, const char* data, [[maybe_unused]] size_t data_size)
int mbtowc(wchar_t* pwc, const char* s, size_t n)
{
// FIXME: This needs a real implementation.
if (wch && data) {
*wch = *data;
return 1;
static mbstate_t internal_state = {};
// Reset the internal state and ask whether we have shift states.
if (s == nullptr) {
internal_state = {};
return 0;
}
if (!wch && data) {
return 1;
size_t ret = mbrtowc(pwc, s, n, &internal_state);
// Incomplete characters get returned as illegal sequence.
// Internal state is undefined, so don't bother with resetting.
if (ret == -2ul) {
errno = EILSEQ;
return -1;
}
return 0;
return ret;
}
int wctomb(char* s, wchar_t wc)