From a2a5593fcc9eb8f373a0515a23ca2ac61eaa3b78 Mon Sep 17 00:00:00 2001
From: bjarni <bjarni@openttd.org>
Date: Thu, 28 Jul 2005 21:47:41 +0000
Subject: (svn r2741) -Feature: [OSX] added a window to display asserts on OSX
 (Tobin)

---
 os/macosx/macos.h | 15 ++++++++++++++-
 os/macosx/macos.m | 11 +++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

(limited to 'os')

diff --git a/os/macosx/macos.h b/os/macosx/macos.h
index c01bfe84c..491f4ff09 100644
--- a/os/macosx/macos.h
+++ b/os/macosx/macos.h
@@ -2,5 +2,18 @@
 #define MACOS_H
 
 void ShowMacDialog ( const char *title, const char *message, const char *buttonLabel );
+void ShowMacAssertDialog ( const char *function, const char *file, const int line, const char *expression );
 
-#endif /* MACOS_H */
\ No newline at end of file
+// Since MacOS X users will never see an assert unless they started the game from a terminal
+// we're using a custom assert(e) macro.
+#undef assert
+
+#ifdef NDEBUG
+#define assert(e)       ((void)0)
+#else
+
+#define assert(e) \
+		(__builtin_expect(!(e), 0) ? ShowMacAssertDialog ( __func__, __FILE__, __LINE__, #e ): (void)0 )
+#endif
+
+#endif /* MACOS_H */
diff --git a/os/macosx/macos.m b/os/macosx/macos.m
index f09a8d3d4..936aaa7a0 100644
--- a/os/macosx/macos.m
+++ b/os/macosx/macos.m
@@ -13,3 +13,14 @@ void ShowMacDialog ( const char *title, const char *message, const char *buttonL
 	NSRunAlertPanel([NSString stringWithCString: title], [NSString stringWithCString: message], [NSString stringWithCString: buttonLabel], nil, nil);
 }
 
+void ShowMacAssertDialog ( const char *function, const char *file, const int line, const char *expression )
+{
+	const char *buffer = 
+			[[NSString stringWithFormat:@"An assertion has failed and OpenTTD must quit.\n%s in %s (line %d)\n\"%s\"\n\nYou should report this error the OpenTTD developers if you think you found a bug.",
+			function, file, line, expression] cStringUsingEncoding:NSASCIIStringEncoding];
+	NSLog(@"%s", buffer);
+	ShowMacDialog( "Assertion Failed", buffer, "Quit" );
+	
+	// abort so that a debugger has a chance to notice
+	abort();
+}
-- 
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