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#include <futex.h>
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#include <futex.h>
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#include <async.h>
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#include <async.h>
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static atomic_t printf_futex = FUTEX_INITIALIZER;
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static atomic_t printf_futex = FUTEX_INITIALIZER;
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static int vprintf_write(const char *str, size_t count, void *unused)
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static int vprintf_str_write(const char *str, size_t size, void *data)
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{
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{
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    size_t offset = 0;
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    size_t prev;
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    count_t chars = 0;
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    while (offset < size) {
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        prev = offset;
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        str_decode(str, &offset, size);
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    return write_stdout(str, count);
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        write_stdout(str + prev, offset - prev);
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        chars++;
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    }
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    return chars;
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}
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}
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static int vprintf_wstr_write(const wchar_t *str, size_t size, void *data)
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{
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    size_t offset = 0;
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    size_t boff;
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    count_t chars = 0;
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    char buf[4];
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    while (offset < size) {
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        boff = 0;
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        chr_encode(str[chars], buf, &boff, 4);
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        write_stdout(buf, boff);
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        chars++;
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        offset += sizeof(wchar_t);
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    }
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    return chars;
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}
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/** Print formatted text.
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/** Print formatted text.
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 * @param fmt   format string
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 * @param fmt   format string
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 * @param ap    format parameters
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 * @param ap    format parameters
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 * \see For more details about format string see printf_core.
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 * \see For more details about format string see printf_core.
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 */
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 */
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int vprintf(const char *fmt, va_list ap)
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int vprintf(const char *fmt, va_list ap)
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{
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{
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    struct printf_spec ps = {
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    struct printf_spec ps = {
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        vprintf_str_write,
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        (int (*)(void *, size_t, void *)) vprintf_write,
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        vprintf_wstr_write,
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         NULL
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         NULL
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    };
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    };
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    /*
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    /*
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     * Prevent other threads to execute printf_core()
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     * Prevent other threads to execute printf_core()
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     */
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     */