christoph/lecture-operating-system-development
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cleanup cga

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This commit is contained in:
Christoph Urlacher
2022-07-23 21:51:29 +02:00
parent 94cc244868
commit 226a247043
3 changed files with 33 additions and 29 deletions
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33
c_os/devices/CGA.cc
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@ -19,7 +19,7 @@
*---------------------------------------------------------------------------*
* Beschreibung: Setzen des Cursors in Spalte x und Zeile y. *
*****************************************************************************/
void CGA::setpos(int x, int y) {
void CGA::setpos(unsigned int x, unsigned int y) {
/* Hier muess Code eingefuegt werden */
@ -42,7 +42,7 @@ void CGA::setpos(int x, int y) {
* *
* Rückgabewerte: x und y *
*****************************************************************************/
void CGA::getpos(int& x, int& y) const {
void CGA::getpos(unsigned int& x, unsigned int& y) const {
/* Hier muess Code eingefuegt werden */
@ -70,7 +70,7 @@ void CGA::getpos(int& x, int& y) const {
* character Das auszugebende Zeichen *
* attrib Attributbyte fuer das Zeichen *
*****************************************************************************/
void CGA::show(int x, int y, char character, unsigned char attrib) {
void CGA::show(unsigned int x, unsigned int y, char character, unsigned char attrib) {
/* Hier muess Code eingefuegt werden */
@ -79,7 +79,7 @@ void CGA::show(int x, int y, char character, unsigned char attrib) {
return;
}
cga_char_t* pos = (cga_char_t*)CGA_START + x + y * COLUMNS;
cga_char_t* pos = reinterpret_cast<cga_char_t*>(CGA_START) + x + y * COLUMNS;
pos->cga_char = character;
pos->cga_attribute = attrib;
}
@ -95,12 +95,13 @@ void CGA::show(int x, int y, char character, unsigned char attrib) {
* n Laenger der Zeichenkette *
* attrib Attributbyte fuer alle Zeichen der Zeichenkette *
*****************************************************************************/
void CGA::print(char* string, int n, unsigned char attrib) {
void CGA::print(char* string, unsigned int n, unsigned char attrib) {
/* Hier muess Code eingefuegt werden */
int cursor_x, cursor_y; // Don't poll registers every stroke
this->getpos(cursor_x, cursor_y);
unsigned int cursor_x = 0;
unsigned int cursor_y = 0; // Don't poll registers every stroke
getpos(cursor_x, cursor_y);
for (int byte = 0; byte < n; ++byte) {
char current = *(string + byte);
@ -110,7 +111,7 @@ void CGA::print(char* string, int n, unsigned char attrib) {
if (cursor_y >= ROWS) {
// Bottom of screen reached
this->scrollup();
scrollup();
cursor_y = cursor_y - 1;
}
@ -122,7 +123,7 @@ void CGA::print(char* string, int n, unsigned char attrib) {
break;
}
this->show(cursor_x, cursor_y, current, attrib);
show(cursor_x, cursor_y, current, attrib);
cursor_x = cursor_x + 1;
if (cursor_x >= COLUMNS) {
@ -132,13 +133,13 @@ void CGA::print(char* string, int n, unsigned char attrib) {
if (cursor_y >= ROWS) {
// Bottom of screen reached
this->scrollup();
scrollup();
cursor_y = cursor_y - 1;
}
}
}
this->setpos(cursor_x, cursor_y);
setpos(cursor_x, cursor_y);
}
/*****************************************************************************
@ -153,10 +154,12 @@ void CGA::scrollup() {
/* Hier muss Code eingefuegt werden */
// Move up
bse::memcpy<cga_line_t>((cga_line_t*)CGA_START, (cga_line_t*)CGA_START + 1, ROWS - 1);
bse::memcpy<cga_line_t>(reinterpret_cast<cga_line_t*>(CGA_START),
reinterpret_cast<cga_line_t*>(CGA_START) + 1,
ROWS - 1);
// Clear last line
bse::zero<cga_line_t>((cga_line_t*)CGA_START + ROWS - 1);
bse::zero<cga_line_t>(reinterpret_cast<cga_line_t*>(CGA_START) + ROWS - 1);
}
/*****************************************************************************
@ -168,8 +171,8 @@ void CGA::clear() {
/* Hier muess Code eingefuegt werden */
bse::zero<cga_page_t>((cga_page_t*)CGA_START);
this->setpos(0, 0);
bse::zero<cga_page_t>(reinterpret_cast<cga_page_t*>(CGA_START));
setpos(0, 0);
}
/*****************************************************************************