/* This function will fill a formatted string to buffer */
rt_int32_t rt_vsprintf(char *buf, const char *format, va_list arg_ptr)
/* This function will fill a formatted string to buffer */
rt_int32_t rt_vsprintf(char *buf, const char *format, va_list arg_ptr)
{
    return rt_vsnprintf(buf, (rt_size_t) - 1, format, arg_ptr);
}