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/*
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/*
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 * Copyright (c) 2006 Josef Cejka
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 * Copyright (c) 2006 Josef Cejka
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 * Copyright (c) 2008 Jakub Jermar
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * are met:
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/** @file
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/** @file
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 */
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 */
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#include <stdarg.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <io/printf_core.h>
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#include <io/printf_core.h>
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#include <futex.h>
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#include <async.h>
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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 asprintf_prewrite(const char *str, size_t count, void *unused)
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{
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{
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    return write_stdout(str, count);
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    return count;
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}
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}
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/** Print formatted text.
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 * @param fmt   format string
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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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 */
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int vprintf(const char *fmt, va_list ap)
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int asprintf(char **strp, const char *fmt, ...)
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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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        (int (*)(void *, size_t, void *)) vprintf_write,
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         asprintf_prewrite,
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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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    int ret;
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     * Prevent other threads to execute printf_core()
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    va_list args;
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     */
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    futex_down(&printf_futex);
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    va_start(args, fmt);
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    /*
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     * Prevent other pseudo threads of the same thread
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    ret = printf_core(fmt, &ps, args);
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    va_end(args);
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    if (ret > 0) {
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     * to execute printf_core()
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        *strp = malloc(ret + 20);
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     */
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        if (!*strp)
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    async_serialize_start();
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            return -1;
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    int ret = printf_core(fmt, &ps, ap);
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        va_start(args, fmt);
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    async_serialize_end();
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        vsprintf(*strp, fmt, args);
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    futex_up(&printf_futex);
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        va_end(args);      
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    }
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    return ret;
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    return ret;
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}
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}
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/** @}
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/** @}
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 */
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 */