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+/*	$NetBSD: shell.h,v 1.16 2003/01/22 20:36:04 dsl Exp $	*/
+
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)shell.h	8.2 (Berkeley) 5/4/95
+ */
+
+/*
+ * The follow should be set to reflect the type of system you have:
+ *	JOBS -> 1 if you have Berkeley job control, 0 otherwise.
+ *	SHORTNAMES -> 1 if your linker cannot handle long names.
+ *	define BSD if you are running 4.2 BSD or later.
+ *	define SYSV if you are running under System V.
+ *	define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
+ *	define DEBUG=2 to compile in and turn on debugging.
+ *	define DO_SHAREDVFORK to indicate that vfork(2) shares its address
+ *	       with its parent.
+ *
+ * When debugging is on, debugging info will be written to ./trace and
+ * a quit signal will generate a core dump.
+ */
+
+#include <sys/param.h>
+
+#ifndef JOBS
+#define JOBS 1
+#endif
+#ifndef BSD
+#define BSD 1
+#endif
+
+#ifndef DO_SHAREDVFORK
+#if __NetBSD_Version__ >= 104000000
+#define DO_SHAREDVFORK
+#endif
+#endif
+
+typedef void *pointer;
+#ifndef NULL
+#define NULL (void *)0
+#endif
+#define STATIC static
+#define MKINIT	/* empty */
+
+#include <sys/cdefs.h>
+
+extern char nullstr[1];		/* null string */
+
+
+#ifdef DEBUG
+#define TRACE(param)	trace param
+#define TRACEV(param)	tracev param
+#else
+#define TRACE(param)
+#define TRACEV(param)
+#endif
+
+#if defined(__GNUC__) && __GNUC__ < 3
+#define va_copy __va_copy
+#endif
+
+#if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
+#define __builtin_expect(x, expected_value) (x)
+#endif
+
+#define likely(x)	__builtin_expect((x),1)
+#define unlikely(x)	__builtin_expect((x),0)