Tmp (for lowlevel forum)

#include "kernel.h"

void init(void)
{
    clearscreen(); // Bildschirm löschen
    printf(".....................................\n");
    printf("Halihalo\n");
    printf("nochma\n");
}


############################################################

#include "video.h"

#define videobuffer 2500

/*
 * Standard-Ein/Ausgabe
 * Copyright (c) Tobias Markus 2011
 * BUILDSTAMP 28/05/2011
 */

// 80 Zeichen 25 Zeilen

static unsigned char buffer[videobuffer];
static unsigned char pointerx = 0;
static unsigned char pointery = 0;
static unsigned char pointer;

void printf(char hw[])
{
    printreal((unsigned char*) hw);
}

void printreal(unsigned char hw[])
{
    int i;

    // C-Strings haben ein Nullbyte als Abschluss
    for (i = 0; hw[i] != '\0'; i++) {
        putc(hw[i]);
    }

    if ((pointery == 25 && pointerx == 80) || pointery == 26) { wraparound(); pointery = 25; pointerx = 0; }
}

void putc(unsigned char output)
{
    getpointer();

    if (output != '\n' && output != '\0') {
        // Zeichen in den Buffer kopieren
        buffer[pointer] = (unsigned char) output;

        // 0x07 = Hellgrau auf Schwarz
        buffer[pointer + 1] = 0x07;

        pointerx++;
    } else if (output == '\n') {
        newline();
    }

    if (pointerx == 80) { newline(); }

    refresh();
}

void refresh()
{
    int i;
    char* video = (char*) 0xb8000;

    for (i = 0; i != 2500; i++) {
        video[i] = buffer[i];
    }
}

int getpointer()
{
    pointer = ((pointery * 80) + pointerx) * 2;
    return pointer;
}

char getcharfrompointer()
{
    getpointer();
    return buffer[pointer];
}

void clearscreen()
{
    int i;
    for (i = 0; i != 2000; i++)
    {
        buffer[i] = (int) 0x0;
    }
    refresh();
}

void wraparound()
{
    int i,x;

    for (i = 0; i != 25; i++)
    {
        for (x = 0; x != 80; x++)
        {
            buffer[((i * 80) + x) * 2] = buffer[((i * 80) + x + 80) * 2];
        }
    }
    for (i = 1920; i != 2000; i++)
    {
        buffer[i] = (int) 0x0;
    }
    refresh();
}

void newline()
{
    pointerx = 0;
    pointery++;
}