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Solved cursor bug in screen

This commit is contained in:
lucic71 2022-06-28 19:40:51 +03:00
parent 7cd7c93166
commit 2a9c322991
1 changed files with 17 additions and 0 deletions
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17
kernel/screen/src/screen_internals.c
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@ -64,6 +64,11 @@ void _screen_scroll_up(void) {
* Wrapper function over _screen_putchar_at. Puts the character in framebuffer and
* has support for newline characters.
*
* If the routine writes to the last position of a line then the cursor will be
* moved on the first position of the following line. If the routine writes to
* the last column of the last line the screen will be scrolled and the cursor
* will be put on the next free line.
*
* Side efects:
* scrolls up the screen whenever there is no more space
* moves the cursor after each displayed characte
@ -72,6 +77,18 @@ void _screen_scroll_up(void) {
void _screen_putchar(char c) {
if (screen_column == VGA_WIDTH - 1 && screen_row == VGA_HEIGHT - 1) {
_screen_putchar_at(c, screen_color, screen_column, screen_row);
_screen_scroll_up();
screen_column = 0;
_screen_move_cursor(screen_column, screen_row);
return;
}
if (screen_column == VGA_WIDTH || c == '\n') {
screen_column = 0;