Initial revision

include/assert.h

@@ -0,0 +1,40 @@
+/* The <assert.h> header contains a macro called "assert" that allows 
+ * programmers to put assertions in the code.  These assertions can be verified
+ * at run time.  If an assertion fails, an error message is printed and the
+ * program aborts.
+ * Assertion checking can be disabled by adding the statement
+ *
+ *	#define NDEBUG
+ *
+ * to the program before the 
+ *
+ *	#include <assert.h>
+ *
+ * statement.
+ */
+
+#undef assert
+
+#ifndef _ANSI_H
+#include <ansi.h>
+#endif
+
+
+#ifdef NDEBUG
+/* Debugging disabled -- do not evaluate assertions. */
+#define assert(expr)  ((void) 0)
+#else
+/* Debugging enabled -- verify assertions at run time. */
+#ifdef _ANSI
+#define	__str(x)	# x
+#define	__xstr(x)	__str(x)
+
+_PROTOTYPE( void __bad_assertion, (const char *_mess) );
+#define	assert(expr)	((expr)? (void)0 : \
+				__bad_assertion("Assertion \"" #expr \
+				    "\" failed, file " __xstr(__FILE__) \
+				    ", line " __xstr(__LINE__) "\n"))
+#else
+#define assert(expr) ((void) ((expr) ? 0 : __assert( __FILE__,  __LINE__)))
+#endif /* _ANSI */
+#endif