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+/* Copyright (C) 1991, 1992, 1994, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/*
+ *	ANSI Standard: 4.2 DIAGNOSTICS	<assert.h>
+ */
+
+#ifdef	_ASSERT_H
+
+#undef	_ASSERT_H
+#undef	assert
+
+#endif /* assert.h	*/
+
+#define	_ASSERT_H	1
+#include <features.h>
+
+/* void assert (int expression);
+
+   If NDEBUG is defined, do nothing.
+   If not, and EXPRESSION is zero, print an error message and abort.  */
+
+#ifdef	NDEBUG
+
+#define	assert(expr)		((void) 0)
+
+/* void assert_perror (int errnum);
+
+   If NDEBUG is defined, do nothing.  If not, and ERRNUM is not zero, print an
+   error message with the error text for ERRNUM and abort.
+   (This is a GNU extension.) */
+
+#ifdef	__USE_GNU
+#define	assert_perror(errnum)	((void) 0)
+#endif
+
+#else /* Not NDEBUG.  */
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/* This prints an "Assertion failed" message and aborts.  */
+extern void __assert_fail __P ((__const char *__assertion,
+				__const char *__file,
+				unsigned int __line,
+				__const char *__function))
+     __attribute__ ((__noreturn__));
+
+/* Likewise, but prints the error text for ERRNUM.  */
+extern void __assert_perror_fail __P ((int __errnum,
+				       __const char *__file,
+				       unsigned int __line,
+				       __const char *__function))
+     __attribute__ ((__noreturn__));
+
+__END_DECLS
+
+#define	assert(expr)							      \
+  ((void) ((expr) ||							      \
+	   (__assert_fail (__STRING(expr),				      \
+			   __FILE__, __LINE__, __ASSERT_FUNCTION), 0)))
+
+#ifdef	__USE_GNU
+#define assert_perror(errnum)						      \
+  ((void) ((errnum) && (__assert_perror_fail ((errnum),			      \
+					      __FILE__, __LINE__,	      \
+					      __ASSERT_FUNCTION), 0)))
+#endif
+
+/* Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'
+   which contains the name of the function currently being defined.
+   This is broken in G++ before version 2.6.  */
+#if (!defined (__GNUC__) || __GNUC__ < 2 || \
+     __GNUC_MINOR__ < (defined (__cplusplus) ? 6 : 4))
+#define __ASSERT_FUNCTION	((__const char *) 0)
+#else
+#define __ASSERT_FUNCTION	__PRETTY_FUNCTION__
+#endif
+
+
+#endif /* NDEBUG.  */
+