1#include "internal.h"
2#include <stdio.h>
3#include <stdlib.h>
4#include <wchar.h>
5
6wint_t btowc(int c) {
7    int b = (unsigned char)c;
8    return b < 128U ? b : (MB_CUR_MAX == 1 && c != EOF) ? CODEUNIT(c) : WEOF;
9}
10