third_party/ulib/musl/src/stdio/fputwc.c

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