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Fix terminal scroll

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Ole Morud
2024-08-01 18:48:09 +02:00
parent 9c99e7f01f
commit 87aa7c4c44
1 changed files with 7 additions and 3 deletions
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10
src/lib/tty.c
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@@ -47,10 +47,14 @@ void terminal_putentryat(char c, uint8_t color, size_t x, size_t y)
void terminal_scroll(int n) void terminal_scroll(int n)
{ {
constexpr size_t buf_size = VGA_WIDTH * VGA_HEIGHT;
const size_t offset = VGA_WIDTH * n;
const size_t len = buf_size - offset;
memmove(terminal_buf, memmove(terminal_buf,
terminal_buf + VGA_WIDTH * n, terminal_buf + offset,
VGA_WIDTH * (VGA_HEIGHT-n)); len * sizeof *terminal_buf);
for (size_t i = VGA_WIDTH * (VGA_HEIGHT-n); i < VGA_WIDTH * VGA_HEIGHT; i++) { for (size_t i = len; i < buf_size; i++) {
terminal_buf[i] = vga_entry(' ', t.color); terminal_buf[i] = vga_entry(' ', t.color);
} }
t.row -= n; t.row -= n;