clean up memory leaks

main.c

@@ -70,7 +70,7 @@ struct NewWindow aboutWindowLayout = {
   40, 40,
   ABOUT_WINDOW_WIDTH, ABOUT_WINDOW_HEIGHT,
   0, 1,
-  IDCMP_REFRESHWINDOW | IDCMP_CLOSEWINDOW | BUTTONIDCMP,
+  IDCMP_CLOSEWINDOW,
   WFLG_DRAGBAR | WFLG_DEPTHGADGET | WFLG_CLOSEGADGET | WFLG_ACTIVATE,
   NULL,
   NULL,
@@ -133,6 +133,7 @@ struct Menu *menu;
 struct Device *TimerBase;
 struct timerequest *TimerIO;
 struct timeval currentSystemTime;
+struct MsgPort *timerPort;
 
 // sound stuff
 // get that bell
@@ -155,6 +156,7 @@ ULONG timerStartTime = 0, timerDistance, timerBuild;
 BOOL timerIsRunning = FALSE;
 BOOL timerStarted = FALSE;
 BOOL terminated = FALSE;
+BOOL openAboutWindowNext = FALSE;
 
 /**
  * Initialize system stuff.
@@ -163,8 +165,6 @@ BOOL terminated = FALSE;
 // parameter.
 // http://www.hipooniosamigasite.org/amigadocs/files/LOON-DOCS-DISKS/LOON5/LatticeC.pt3
 int setup(void) {
-  struct MsgPort *timerPort;
-
   // make sure the font exists on the computer
   // http://amigadev.elowar.com/read/ADCD_2.1/Includes_and_Autodocs_3._guide/node0308.html
   if (NULL == (topaz80Font = OpenFont(&Topaz80))) {
@@ -218,15 +218,12 @@ int setup(void) {
  */
 void teardown(void) {
   // http://amigadev.elowar.com/read/ADCD_2.1/Devices_Manual_guide/node0196.html
-  struct MsgPort *tempTimerPort;
-
   if (TimerIO) {
     CloseDevice((struct IORequest *)TimerIO);
-    tempTimerPort = TimerIO->tr_node.io_Message.mn_ReplyPort;
-
-    if (tempTimerPort) {
-      DeletePort(tempTimerPort);
-    }
+    DeleteExtIO((struct IORequest *)TimerIO);
+  }
+  if (timerPort) {
+    DeletePort(timerPort);
   }
   // all right, then. keep your secrets.
   if (visualInfo) FreeVisualInfo(visualInfo);
@@ -527,6 +524,14 @@ int openAboutWindow(void) {
 
   ULONG windowSignal;
   BOOL closeAbout = FALSE;
+
+  // Something is causing a small memory leak when I do this and I don't know
+  // what it is. CodeWatcher reports a bunch of 40 byte blocks, most likely
+  // Intuition messages.
+  //
+  // nope, false positive, checked with avail before and after running and
+  // the used/free counts are exactly the same:
+  // https://eab.abime.net/showthread.php?t=104360
   aboutWindow = OpenWindow(&aboutWindowLayout);
 
   if (!aboutWindow) {
@@ -584,16 +589,21 @@ int openAboutWindow(void) {
   while (!closeAbout) {
     Wait(windowSignal);
 
-    while (!closeAbout && (iMessage = GT_GetIMsg(aboutWindow->UserPort))) {
-      switch (iMessage->Class) {
-        case IDCMP_CLOSEWINDOW:
-          closeAbout = TRUE;
-          break;
-        case IDCMP_REFRESHWINDOW:
-          GT_BeginRefresh(window);
-          GT_EndRefresh(window, TRUE);
-          break;
+    while (iMessage = GT_GetIMsg(aboutWindow->UserPort)) {
+      if (!closeAbout) {
+        switch (iMessage->Class) {
+          case IDCMP_CLOSEWINDOW:
+            closeAbout = TRUE;
+            break;
+          case IDCMP_REFRESHWINDOW:
+            GT_BeginRefresh(window);
+            GT_EndRefresh(window, TRUE);
+            break;
+        }
       }
+
+      // ensure messages are garbage collected
+      GT_ReplyIMsg(iMessage);
     }
   }
 
@@ -648,10 +658,7 @@ void handleIntuitionMessage(struct IntuiMessage *iMessage) {
           terminated = TRUE;
           break;
         case MENU_ABOUT_ID:
-          // yes, this blocks, deal with it
-          // it also returns non-zero if something goes wrong.
-          // in that case, kill the program
-          if (openAboutWindow()) terminated = TRUE;
+          openAboutWindowNext = TRUE;
           break;
       }
       break;
@@ -833,14 +840,26 @@ int main() {
 
     if (foundSignals & windowSignal) {
       // drain the window event queue
-      while ((!terminated) && (iMessage = GT_GetIMsg(window->UserPort))) {
-        handleIntuitionMessage(iMessage);
+      while (iMessage = GT_GetIMsg(window->UserPort)) {
+        if (!terminated) {
+          handleIntuitionMessage(iMessage);
+        }
+
+        // if we don't reply, the event won't be garbage collected.
+        // we still have to drain any other messages that show up
+        GT_ReplyIMsg(iMessage);
       }
     }
 
     if ((foundSignals & timerSignal) && timerIsRunning) {
       handleTimerMessage();
     }
+
+    if (openAboutWindowNext) {
+      if (openAboutWindow()) terminated = TRUE;
+
+      openAboutWindowNext = FALSE;
+    }
   }
 
   clearUI();