third_party/ulib/musl/src/multibyte/btowc.c

#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>

wint_t btowc(int c) {
    int b = (unsigned char)c;
    return b < 128U ? b : (MB_CUR_MAX == 1 && c != EOF) ? CODEUNIT(c) : WEOF;
}