remove binaries

c_os/devices/CGA.cc

@@ -23,6 +23,17 @@ void CGA::setpos (int x, int y) {
 
     /* Hier muess Code eingefuegt werden */
 
+    // NOTE: The cursor addresses positions on screen, not bytes
+    unsigned short pos = x + y * 80;
+    unsigned char cursor_low = pos & 0xFF;
+    unsigned char cursor_high = (pos >> 8) & 0xFF;
+
+    index_port.outb(0xF); // Cursor(low)
+    data_port.outb(cursor_low);
+
+    index_port.outb(0xE); // Cursor(high)
+    data_port.outb(cursor_high);
+
 }
 
 
@@ -34,9 +45,22 @@ void CGA::setpos (int x, int y) {
  * Rückgabewerte:   x und y                                                  *
  *****************************************************************************/
 void CGA::getpos (int &x, int &y) {
-    
+
     /* Hier muess Code eingefuegt werden */
-    
+
+    index_port.outb(0xF); // Cursor(low)
+    unsigned char cursor_low = data_port.inb();
+
+    index_port.outb(0xE); // Cursor(high)
+    unsigned char cursor_high = data_port.inb();
+
+    unsigned short cursor =
+        (cursor_low & 0xFF)
+        | ((cursor_high << 8) & 0xFF00);
+
+    x = cursor % 80;
+    y = (int)(cursor / 80);
+
 }
 
 
@@ -52,9 +76,15 @@ void CGA::getpos (int &x, int &y) {
  *      attrib      Attributbyte fuer das Zeichen                            *
  *****************************************************************************/
 void CGA::show (int x, int y, char character, unsigned char attrib) {
-    
+
     /* Hier muess Code eingefuegt werden */
-    
+
+    char* pos = (char*)(CGA_START + 2 * (x + y * 80)); // cast to char* to make writable
+    *pos = character;
+    *(pos + 1) = attrib;
+
+    // TODO: screen border check
+
 }
 
 
@@ -70,9 +100,33 @@ void CGA::show (int x, int y, char character, unsigned char attrib) {
  *      attrib      Attributbyte fuer alle Zeichen der Zeichenkette          *
  *****************************************************************************/
 void CGA::print (char* string, int n, unsigned char attrib) {
-    
+
     /* Hier muess Code eingefuegt werden */
-    
+
+    int cursor_x, cursor_y;
+    this->getpos(cursor_x, cursor_y);
+
+    for (unsigned short byte = 0; byte < n; ++byte) {
+
+        char current = *(string + byte);
+        if (current == '\n') {
+            // TODO: Screen bounds
+            cursor_x = 0;
+            cursor_y = cursor_y + 1;
+            continue;
+        } else if (current == '\0') {
+            break;
+        }
+
+        this->show(cursor_x, cursor_y, current, attrib);
+        cursor_x = cursor_x + 1;
+    }
+
+    this->setpos(cursor_x, cursor_y);
+
+    // TODO: automatic line breaking, automatic scrolling
+    // TODO: printing doesn't work after first newline character
+
 }
 
 
@@ -84,9 +138,19 @@ void CGA::print (char* string, int n, unsigned char attrib) {
  *                  gefuellt.                                                *
  *****************************************************************************/
 void CGA::scrollup () {
-    
+
     /* Hier muess Code eingefuegt werden */
-    
+
+    // Move up
+    for (unsigned short byte = 2 * 80 * 1; byte < 2 * 80 * 25; ++byte) {
+        *((char*)(CGA_START + byte - 2 * 80 * 1)) = *(CGA_START + byte);
+    }
+
+    // Clear last line
+    for (unsigned short byte = 2 * 80 * 24; byte < 2 * 80 * 25; ++byte) {
+        *((char*)(CGA_START + byte)) = '\0';
+    }
+
 }
 
 
@@ -96,9 +160,12 @@ void CGA::scrollup () {
  * Beschreibung:    Lösche den Textbildschirm.                               *
  *****************************************************************************/
 void CGA::clear () {
-    
+
     /* Hier muess Code eingefuegt werden */
-    
+    for (unsigned short byte = 2 * 80 * 0; byte < 2 * 80 * 25; ++byte) {
+        *((char*)(CGA_START + byte)) = '\0';
+    }
+
 }
 
 
@@ -115,7 +182,7 @@ void CGA::clear () {
  *      blink       ywa/no                                                   *
  *****************************************************************************/
 unsigned char CGA::attribute (CGA::color bg, CGA::color fg, bool blink) {
-    
+
     /* Hier muess Code eingefuegt werden */
     
 }