static int vt_notifier_call()

in braille/braille_console.c [264:339]

• 72 lines of code
• 20 McCabe index (conditional complexity)

static int vt_notifier_call(struct notifier_block *blk,
			    unsigned long code, void *_param)
{
	struct vt_notifier_param *param = _param;
	struct vc_data *vc = param->vc;

	switch (code) {
	case VT_ALLOCATE:
		break;
	case VT_DEALLOCATE:
		break;
	case VT_WRITE:
	{
		unsigned char c = param->c;

		if (vc->vc_num != fg_console)
			break;
		switch (c) {
		case '\b':
		case 127:
			if (console_cursor > 0) {
				console_cursor--;
				console_buf[console_cursor] = ' ';
			}
			break;
		case '\n':
		case '\v':
		case '\f':
		case '\r':
			console_newline = 1;
			break;
		case '\t':
			c = ' ';
			fallthrough;
		default:
			if (c < 32)
				/* Ignore other control sequences */
				break;
			if (console_newline) {
				memset(console_buf, 0, sizeof(console_buf));
				console_cursor = 0;
				console_newline = 0;
			}
			if (console_cursor == WIDTH)
				memmove(console_buf, &console_buf[1],
					(WIDTH-1) * sizeof(*console_buf));
			else
				console_cursor++;
			console_buf[console_cursor-1] = c;
			break;
		}
		if (console_show)
			braille_write(console_buf);
		else {
			vc_maybe_cursor_moved(vc);
			vc_refresh(vc);
		}
		break;
	}
	case VT_UPDATE:
		/* Maybe a VT switch, flush */
		if (console_show) {
			if (vc->vc_num != lastVC) {
				lastVC = vc->vc_num;
				memset(console_buf, 0, sizeof(console_buf));
				console_cursor = 0;
				braille_write(console_buf);
			}
		} else {
			vc_maybe_cursor_moved(vc);
			vc_refresh(vc);
		}
		break;
	}
	return NOTIFY_OK;
}