vga.h File Reference

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Functions
void	vga_putc (int)

Function Documentation

vga_putc()

void vga_putc

(

int

c

)

                 {
    /* Disable interrupts to lock out interrupt handlers
       that might write to the console. */
    enum intr_level old_level = intr_disable ();
 
    init ();
 
    switch (c) {
        case '\n':
            newline ();
            break;
 
        case '\f':
            cls ();
            break;
 
        case '\b':
            if (cx > 0)
                cx--;
            break;
 
        case '\r':
            cx = 0;
            break;
 
        case '\t':
            cx = ROUND_UP (cx + 1, 8);
            if (cx >= COL_CNT)
                newline ();
            break;
 
        default:
            fb[cy][cx][0] = c;
            fb[cy][cx][1] = GRAY_ON_BLACK;
            if (++cx >= COL_CNT)
                newline ();
            break;
    }
 
    /* Update cursor position. */
    move_cursor ();
 
    intr_set_level (old_level);
}

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