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Add console scrolling

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This commit is contained in:
Braiden Vasco 2017-11-04 08:53:01 +00:00
parent ff3fc403f1
commit 857e48770c
1 changed files with 22 additions and 5 deletions
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27
arch/console.c
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@ -16,6 +16,8 @@ static unsigned char vga_entry_color(enum vga_color fg, enum vga_color bg);
static unsigned short vga_entry(unsigned char uc, unsigned char color);
static void console_putentryat(char c, unsigned char color, unsigned int x, unsigned int y);
static void console_scroll();
void console_initialize() {
console_row = 0;
console_column = 0;
@ -38,8 +40,9 @@ void console_putc(const char c) {
if (c == '\n') {
console_column = 0;
if (++console_row == console_height) {
console_row = 0;
if (++console_row >= console_height) {
console_row = console_height - 1;
console_scroll();
}
return;
@ -47,11 +50,12 @@ void console_putc(const char c) {
console_putentryat(c, console_color, console_column, console_row);
if (++console_column == console_width) {
if (++console_column >= console_width) {
console_column = 0;
if (++console_row == console_height) {
console_row = 0;
if (++console_row >= console_height) {
console_row = console_height - 1;
console_scroll();
}
}
}
@ -84,3 +88,16 @@ void console_putentryat(char c, unsigned char color, unsigned int x, unsigned in
const unsigned int index = y * console_width + x;
console_buffer[index] = vga_entry(c, color);
}
void console_scroll()
{
for (unsigned int row = 1; row < console_height; ++row) {
for (unsigned int col = 0; col < console_width; ++col) {
console_buffer[(row - 1) * console_width + col] = console_buffer[row * console_width + col];
}
}
for(unsigned int col = 0; col < console_width; ++col) {
console_buffer[(console_height - 1) * console_width + col] = ' ';
}
}