upper bound for lap numbers

3 files changed, 5 insertions, 3 deletions

diff --git a/src/components/stopwatch/StopWatchController.cpp b/src/components/stopwatch/StopWatchController.cpp
index 7af80367..311bccc7 100644
--- a/src/components/stopwatch/StopWatchController.cpp
+++ b/src/components/stopwatch/StopWatchController.cpp
@@ -34,7 +34,7 @@ void StopWatchController::Clear() {
 void StopWatchController::AddLapToHistory() {
   TickType_t lapEnd = GetElapsedTime();
   history[0].timeSinceStart = lapEnd;
-  history[0].number = ++maxLapNumber;
+  history[0].number = ++maxLapNumber % lapNumberBoundary;
   history--;
 }
 
diff --git a/src/components/stopwatch/StopWatchController.h b/src/components/stopwatch/StopWatchController.h
index 800ca1b3..0791701c 100644
--- a/src/components/stopwatch/StopWatchController.h
+++ b/src/components/stopwatch/StopWatchController.h
@@ -55,9 +55,10 @@ namespace Pinetime {
 
       // Maximum number of stored laps
       static constexpr int histSize = 2;
+      static constexpr int lapNumberBoundary = 1000;
       // Lap storage
       Utility::CircularBuffer<LapInfo, histSize> history;
-      // Highest lap number; may exceed histSize
+      // Highest lap number; less than lapNumberBoundary, may exceed histSize
       int maxLapNumber;
     };
   }
diff --git a/src/displayapp/screens/StopWatch.cpp b/src/displayapp/screens/StopWatch.cpp
index 710c4d44..08bc5ddd 100644
--- a/src/displayapp/screens/StopWatch.cpp
+++ b/src/displayapp/screens/StopWatch.cpp
@@ -181,7 +181,8 @@ void StopWatch::RenderLaps() {
     if (lap) {
       TimeSeparated laptime = ConvertTicksToTimeSegments(lap->timeSinceStart);
       char buffer[16];
-      sprintf(buffer, "#%2d   %2d:%02d.%02d\n", lap->number, laptime.mins, laptime.secs, laptime.hundredths);
+      snprintf(buffer, sizeof(buffer), "#%3d  %2d:%02d.%02d\n",
+        lap->number, laptime.mins, laptime.secs, laptime.hundredths);
       lv_label_ins_text(lapText, LV_LABEL_POS_LAST, buffer);
     } else {
       lv_label_ins_text(lapText, LV_LABEL_POS_LAST, "\n");