Advanced MT_assert macro.

It will attempt to break into the debugger instead of aborting the program.  On Windows you have a nice MessageBox function, so you can choose to break, ignore, or permanently ignore the assert.

intern/moto/include/MT_assert.h

@@ -38,9 +38,53 @@
 
 #else 
 
-#include <assert.h>
+#include <signal.h>
+#include <stdlib.h>
 
-#define MT_assert(predicate) assert(predicate)
+// BREAKPOINT() will cause a break into the debugger
+#if defined(__i386) && defined(__GNUC__)
+// gcc on intel...
+#define BREAKPOINT() \
+	asm("int $3")
+#elif defined(_MSC_VER)
+// Visual C++ (on Intel)
+#define BREAKPOINT() \
+	{ _asm int 3 }
+#elif defined(SIGTRAP)
+// POSIX compatible...
+#define BREAKPOINT() \
+	raise(SIGTRAP);
+#else
+// FIXME: Don't know how to do a decent break!
+// Add some code for your cpu type, or get a posix
+// system.
+// abort instead
+#define BREAKPOINT() \
+	abort();
+#endif
+	
+// So it can be used from C
+#ifdef __cplusplus
+#define MT_CDECL extern "C"
+#else
+#define MT_CDECL
+#endif
+
+// Ask the user if they wish to abort/break, ignore, or ignore for good.
+// file, line, predicate form the message to ask, *do_assert should be set
+// to 0 to ignore.
+// returns 1 to break, false to ignore
+MT_CDECL int MT_QueryAssert(char *file, int line, char *predicate, int *do_assert);
+
+// Abort the program if predicate is not true
+#define MT_assert(predicate) 									\
+{ 												\
+	static int do_assert = 1; 								\
+	if (!(predicate) && MT_QueryAssert(__FILE__, __LINE__, #predicate, &do_assert))		\
+	{											\
+		BREAKPOINT();									\
+	}											\
+}
 
 #endif /* MT_NDEBUG */
 

intern/moto/intern/MT_Assert.cpp

@@ -0,0 +1,65 @@
+/**
+ * $Id$
+ * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ */
+
+#include <stdio.h>
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include "MT_assert.h"
+
+#ifdef _MSC_VER
+#define _snprintf snprintf
+#endif
+
+// Query the user if they want to break/abort the program, ignore the assert, or ignore all future
+// occurance of the assert.
+int MT_QueryAssert(char *file, int line, char *predicate, int *do_assert)
+{
+#ifdef _WIN32
+	if (*do_assert)
+	{
+		char buffer[1024];
+		snprintf(buffer, 1024, "ASSERT %s:%d: %s failed.\nWould you like to debug? (Cancel = ignore)", file, line, predicate);
+		int result = MessageBox(NULL, buffer, "ASSERT failed.", MB_YESNOCANCEL|MB_ICONERROR);
+		if (result == IDCANCEL)
+		{
+			*do_assert = 0;
+			return 0;
+		}
+		
+		return result == IDYES;
+	}
+#endif
+	printf("ASSERT %s:%d: %s failed.\n", file, line, predicate);
+	return *do_assert;
+}