turn recovery into a C++ binary

Change-Id: I423a23581048d451d53eef46e5f5eac485b77555
diff --git a/common.h b/common.h
index ef2fe9f..88807b8 100644
--- a/common.h
+++ b/common.h
@@ -19,61 +19,12 @@
 #include <stdio.h>
-// Initialize the graphics system.
-void ui_init();
+#ifdef __cplusplus
+extern "C" {
-// Use KEY_* codes from <linux/input.h> or KEY_DREAM_* from "minui/minui.h".
-int ui_wait_key();            // waits for a key/button press, returns the code
-int ui_key_pressed(int key);  // returns >0 if the code is currently pressed
-int ui_text_visible();        // returns >0 if text log is currently visible
-int ui_text_ever_visible();   // returns >0 if text log was ever visible
-void ui_show_text(int visible);
-void ui_clear_key_queue();
-// Write a message to the on-screen log shown with Alt-L (also to stderr).
-// The screen is small, and users may need to report these messages to support,
-// so keep the output short and not too cryptic.
-void ui_print(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
-// Display some header text followed by a menu of items, which appears
-// at the top of the screen (in place of any scrolling ui_print()
-// output, if necessary).
-void ui_start_menu(char** headers, char** items, int initial_selection);
-// Set the menu highlight to the given index, and return it (capped to
-// the range [0..numitems).
-int ui_menu_select(int sel);
-// End menu mode, resetting the text overlay so that ui_print()
-// statements will be displayed.
-void ui_end_menu();
-// Set the icon (normally the only thing visible besides the progress bar).
-enum {
-void ui_set_background(int icon);
-// Show a progress bar and define the scope of the next operation:
-//   portion - fraction of the progress bar the next operation will use
-//   seconds - expected time interval (progress bar moves at this minimum rate)
-void ui_show_progress(float portion, int seconds);
-void ui_set_progress(float fraction);  // 0.0 - 1.0 within the defined scope
-// Default allocation of progress bar segments to operations
-static const int VERIFICATION_PROGRESS_TIME = 60;
-static const float VERIFICATION_PROGRESS_FRACTION = 0.25;
-static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4;
-static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1;
-// Show a rotating "barberpole" for ongoing operations.  Updates automatically.
-void ui_show_indeterminate_progress();
-// Hide and reset the progress bar.
-void ui_reset_progress();
-#define LOGE(...) ui_print("E:" __VA_ARGS__)
+// TODO: restore ui_print for LOGE
+#define LOGE(...) fprintf(stdout, "E:" __VA_ARGS__)
 #define LOGW(...) fprintf(stdout, "W:" __VA_ARGS__)
 #define LOGI(...) fprintf(stdout, "I:" __VA_ARGS__)
@@ -129,4 +80,8 @@
 // fopen a file, mounting volumes and making parent dirs as necessary.
 FILE* fopen_path(const char *path, const char *mode);
+#ifdef __cplusplus