From 6fda4ae759f96519037e71ffd3c8b298d388ff0c Mon Sep 17 00:00:00 2001
From: Richard Braun <rbraun@sceen.net>
Date: Sun, 18 Jun 2017 20:44:58 +0200
Subject: kern/console: add support for scrolling

---
 kern/console.c | 21 ++++++++++++++++++++-
 kern/console.h |  3 +++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/kern/console.c b/kern/console.c
index 00d6e46d..e026ffd5 100644
--- a/kern/console.c
+++ b/kern/console.c
@@ -66,6 +66,21 @@ console_init(struct console *console, const char *name,
     strlcpy(console->name, name, sizeof(console->name));
 }
 
+static int
+console_process_ctrl_char(struct console *console, char c)
+{
+    switch (c) {
+    case CONSOLE_SCROLL_UP:
+    case CONSOLE_SCROLL_DOWN:
+        break;
+    default:
+        return ERROR_INVAL;
+    }
+
+    console->ops->putc(console, c);
+    return 0;
+}
+
 static void
 console_putc(struct console *console, char c)
 {
@@ -96,7 +111,11 @@ console_getc(struct console *console)
         error = cbuf_pop(&console->recvbuf, &c);
 
         if (!error) {
-            break;
+            error = console_process_ctrl_char(console, c);
+
+            if (error) {
+                break;
+            }
         }
 
         thread_sleep(&console->lock, console, "consgetc");
diff --git a/kern/console.h b/kern/console.h
index 7455a051..a5aa478d 100644
--- a/kern/console.h
+++ b/kern/console.h
@@ -26,6 +26,9 @@
 #include <kern/spinlock.h>
 #include <kern/thread.h>
 
+#define CONSOLE_SCROLL_UP   0x12    /* DC2 */
+#define CONSOLE_SCROLL_DOWN 0x14    /* DC4 */
+
 struct console;
 
 struct console_ops {
-- 
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