source: azure_iot_hub/trunk/musl-1.1.18/src/stdio/fputwc.c@ 388

#include "stdio_impl.h"
#include "locale_impl.h"
#include <wchar.h>
#include <limits.h>
#include <ctype.h>

wint_t __fputwc_unlocked(wchar_t c, FILE *f)
{
        char mbc[MB_LEN_MAX];
        int l;
        locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;

        if (f->mode <= 0) fwide(f, 1);
        *ploc = f->locale;

        if (isascii(c)) {
                c = putc_unlocked(c, f);
        } else if (f->wpos + MB_LEN_MAX < f->wend) {
                l = wctomb((void *)f->wpos, c);
                if (l < 0) c = WEOF;
                else f->wpos += l;
        } else {
                l = wctomb(mbc, c);
                if (l < 0 || __fwritex((void *)mbc, l, f) < l) c = WEOF;
        }
        if (c==WEOF) f->flags |= F_ERR;
        *ploc = loc;
        return c;
}

wint_t fputwc(wchar_t c, FILE *f)
{
        FLOCK(f);
        c = __fputwc_unlocked(c, f);
        FUNLOCK(f);
        return c;
}

weak_alias(__fputwc_unlocked, fputwc_unlocked);
weak_alias(__fputwc_unlocked, putwc_unlocked);