2 files changed, 35 insertions, 0 deletions

diff --git a/wear_ui.cpp b/wear_ui.cpp
index 50aeb3849..8a57cfffa 100644
--- a/wear_ui.cpp
+++ b/wear_ui.cpp
@@ -36,6 +36,7 @@
 #include "ui.h"
 #include "cutils/properties.h"
 #include "android-base/strings.h"
+#include "android-base/stringprintf.h"
 
 static int char_width;
 static int char_height;
@@ -653,3 +654,35 @@ void WearRecoveryUI::ClearText() {
     }
     pthread_mutex_unlock(&updateMutex);
 }
+
+void WearRecoveryUI::PrintOnScreenOnly(const char *fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    PrintV(fmt, false, ap);
+    va_end(ap);
+}
+
+void WearRecoveryUI::PrintV(const char* fmt, bool copy_to_stdout, va_list ap) {
+    std::string str;
+    android::base::StringAppendV(&str, fmt, ap);
+
+    if (copy_to_stdout) {
+        fputs(str.c_str(), stdout);
+    }
+
+    pthread_mutex_lock(&updateMutex);
+    if (text_rows > 0 && text_cols > 0) {
+        for (const char* ptr = str.c_str(); *ptr != '\0'; ++ptr) {
+            if (*ptr == '\n' || text_col >= text_cols) {
+                text[text_row][text_col] = '\0';
+                text_col = 0;
+                text_row = (text_row + 1) % text_rows;
+                if (text_row == text_top) text_top = (text_top + 1) % text_rows;
+            }
+            if (*ptr != '\n') text[text_row][text_col++] = *ptr;
+        }
+        text[text_row][text_col] = '\0';
+        update_screen_locked();
+    }
+    pthread_mutex_unlock(&updateMutex);
+}
diff --git a/wear_ui.h b/wear_ui.h
index 63c1b6e6e..768141ccc 100644
--- a/wear_ui.h
+++ b/wear_ui.h
@@ -47,6 +47,7 @@ class WearRecoveryUI : public RecoveryUI {
 
     // printing messages
     void Print(const char* fmt, ...);
+    void PrintOnScreenOnly(const char* fmt, ...) __printflike(2, 3);
     void ShowFile(const char* filename);
     void ShowFile(FILE* fp);
 
@@ -133,6 +134,7 @@ class WearRecoveryUI : public RecoveryUI {
     void ClearText();
     void DrawTextLine(int x, int* y, const char* line, bool bold);
     void DrawTextLines(int x, int* y, const char* const* lines);
+    void PrintV(const char*, bool, va_list);
 };
 
 #endif  // RECOVERY_WEAR_UI_H