move user stuff to user

c_os/user/ScrollbackBuffer.h

@@ -0,0 +1,31 @@
+#ifndef __SCROLLBACKBUFFER_INCLUDE_H_
+#define __SCROLLBACKBUFFER_INCLUDE_H_
+
+#include "devices/CGA.h"
+#include "user/MyLib.h"
+#include <memory>
+#include <stddef.h>
+
+class ScrollbackBuffer {
+private:
+    std::unique_ptr<CGA::cga_page_t[]> buffer;  // Circular buffer to store lines that left the screen
+    unsigned int pos;                           // Buffer write position
+
+    ScrollbackBuffer(const ScrollbackBuffer&) = delete;
+
+public:
+    const unsigned int pages;  // Number of pages in buffer
+    const unsigned int rows;   // Number of lines in buffer
+
+    ScrollbackBuffer(unsigned char rows, unsigned char pages)
+      : pos(0), pages(pages), rows(rows * pages) {
+        this->buffer = std::make_unique<CGA::cga_page_t[]>(pages);  // Allocate with new because it's quite large (and I want to use the allocator)
+        this->clear();                                              // Null out the buffer so no crap gets displayed
+    }
+
+    void put(CGA::cga_line_t* line);
+    void get(CGA::cga_line_t* destination, unsigned char page) const;
+    void clear();
+};
+
+#endif