diff options
| -rw-r--r-- | src/init/ansiterm.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/init/ansiterm.c b/src/init/ansiterm.c index c66d39b..41b313f 100644 --- a/src/init/ansiterm.c +++ b/src/init/ansiterm.c @@ -1,4 +1,5 @@ #include <shared/syscalls.h> +#include <stdbool.h> struct vga_cell { unsigned char c; @@ -10,10 +11,15 @@ static handle_t tty_fd; static handle_t vga_fd; static struct {int x, y;} cursor = {0}; +static bool dirty = false; +static bool pendingFlush = false; +/* TODO unflushed writes mix with the kernel's vga driver */ static void flush(void) { _syscall_write(vga_fd, vga, sizeof vga, 0); + dirty = false; + pendingFlush = false; } static void scroll(void) { @@ -22,6 +28,7 @@ static void scroll(void) { for (size_t i = 80 * 24; i < 80 * 25; i++) vga[i].c = ' '; cursor.y--; + pendingFlush = true; } static void in_char(char c) { @@ -29,6 +36,7 @@ static void in_char(char c) { case '\n': cursor.x = 0; cursor.y++; + pendingFlush = true; break; case '\b': if (--cursor.x < 0) cursor.x = 0; @@ -42,6 +50,7 @@ static void in_char(char c) { cursor.y++; } while (cursor.y >= 25) scroll(); + dirty = true; } void ansiterm_drv(void) { @@ -74,13 +83,14 @@ void ansiterm_drv(void) { _syscall_write(tty_fd, buf, res.len, 0); for (int i = 0; i < res.len; i++) in_char(buf[i]); - flush(); + if (pendingFlush) flush(); _syscall_fs_respond(NULL, res.len); break; case VFSOP_READ: if (res.capacity > sizeof buf) res.capacity = sizeof buf; + if (dirty) flush(); size_t len = _syscall_read(tty_fd, buf, res.capacity, 0); _syscall_fs_respond(buf, len); break; |