Function rt_kprintf

src/kservice.c:359–385

* @brief This function will print a formatted string on system console. * * @param fmt is the format parameters. * * @return The number of characters actually written to buffer. */

 * @return The number of characters actually written to buffer.
 */
rt_weak int rt_kprintf(const char *fmt, ...)
{
    va_list args;
    rt_size_t length = 0;
    static char rt_log_buf[RT_CONSOLEBUF_SIZE];

    va_start(args, fmt);
    PRINTF_BUFFER_TAKE;

    /* the return value of vsnprintf is the number of bytes that would be
     * written to buffer had if the size of the buffer been sufficiently
     * large excluding the terminating null byte. If the output string
     * would be larger than the rt_log_buf, we have to adjust the output
     * length. */
    length = rt_vsnprintf(rt_log_buf, sizeof(rt_log_buf) - 1, fmt, args);
    if (length > RT_CONSOLEBUF_SIZE - 1)
    {
        length = RT_CONSOLEBUF_SIZE - 1;
    }

    _kputs(rt_log_buf, length);

    PRINTF_BUFFER_RELEASE;
    va_end(args);

    return length;
}
RTM_EXPORT(rt_kprintf);
#endif /* RT_USING_CONSOLE */