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authorDanny Holman <dholman@gymli.xyz>2021-01-28 00:05:00 -0600
committerDanny Holman <dholman@gymli.xyz>2021-01-28 00:05:00 -0600
commit12c900f24ebd717c0de79dec804f39b6235d4cfa (patch)
tree5d57a6cf2f587b3333762e46074a218e480a36cd /arch/i386
parentdce1e97e7503e90e1d2fcfc0ab11b8d2c7ad1dfb (diff)
i386: create terminal_scroll function
Add support for scrolling the terminal at the end of the VGA buffer. Signed-off-by: Danny Holman <dholman@gymli.xyz>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/boot/tty.c35
1 files changed, 25 insertions, 10 deletions
diff --git a/arch/i386/boot/tty.c b/arch/i386/boot/tty.c
index ed0aaf4..9244415 100644
--- a/arch/i386/boot/tty.c
+++ b/arch/i386/boot/tty.c
@@ -35,20 +35,35 @@ void tty_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
terminal_buffer[index] = vga_entry(c, color);
}
+void terminal_scroll(void) {
+ for (size_t i = 0; i < VGA_HEIGHT; i++) {
+ for (size_t j = 0; j < VGA_WIDTH; j++)
+ terminal_buffer[i * VGA_WIDTH + j] = terminal_buffer[(i+1) * VGA_WIDTH + j];
+ }
+}
+
void tty_putchar(char c) {
- unsigned char uc = c;
+ unsigned char uc;
+
+ uc = c;
switch (uc) {
case '\n':
terminal_column = 0;
- terminal_row++;
- return;
- }
-
- tty_putentryat(uc, terminal_color, terminal_column, terminal_row);
- if (++terminal_column == VGA_WIDTH) {
- terminal_column = 0;
- if (++terminal_row == VGA_HEIGHT)
- terminal_row = 0;
+ if (++terminal_row == VGA_HEIGHT) {
+ terminal_row--;
+ terminal_scroll();
+ }
+ break;
+ default:
+ tty_putentryat(uc, terminal_color, terminal_column, terminal_row);
+ if (++terminal_column == VGA_WIDTH) {
+ terminal_column = 0;
+ if (++terminal_row == VGA_HEIGHT) {
+ terminal_row--;
+ terminal_scroll();
+ }
+ }
+ break;
}
}