include cleanups: remove unused headers and add feature test macros

[musl] / src / multibyte / wctomb.c

/* 
 * This code was written by Rich Felker in 2010; no copyright is claimed.
 * This code is in the public domain. Attribution is appreciated but
 * unnecessary.
 */

#include <stdlib.h>
#include <wchar.h>

int wctomb(char *s, wchar_t wc)
{
        if (!s) return 0;
        return wcrtomb(s, wc, 0);
}