serial_con.hpp

#if !defined(__SERIAL_CON_HPP__)
#define __SERIAL_CON_HPP__

//
// local includes
//
#include "serial_driver.hpp"
#include "con_terminal.hpp"

struct serial_con : public serial_driver, public con_terminal
{
    static const int BUFFER_SIZE = 256;

  protected:
    char buffer[BUFFER_SIZE+1], *ptr;

  public:
    inline serial_con(const color_t fgcolor=DEFAULT_FGCOLOR, const color_t bgcolor=DEFAULT_BGCOLOR,
                      const rect_t &margins=((rect_t){x: 0, y: 0, w: 0, h: 0}))
        : con_terminal(fgcolor, bgcolor, margins), ptr(buffer)
    {
        if (!is_open()) log::error("%s: disabled\n", name());
    }

    //
    // serial_driver: override name, reset & write
    //
    virtual inline const char *name(void) const
    {
        return L4VMM_DRIVER" CON serial";
    }

    virtual inline int reset(void)
    {
        return con_terminal::reset();
    }

    virtual inline int write(uint8_t c)
    {
        //
        // linux printk prints \r\n at the end of a line, so skip \r.
        //     do not print it. otherwise the line is lost.
        //
        if (c == '\r') return 0;

        //
        // cache until a newline appears or the buffer overflows.
        //
        *ptr++=c;
        return ((c == '\n') || (ptr - buffer > BUFFER_SIZE)) ? do_print() : 0;
    }

  private:
    inline int do_print(void)
    {
        *ptr=0;
        return print(ptr=buffer);
    }
};

#endif

// ***** end of source ***** //