1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 1997-2005
5 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	@(#)shell.h	8.2 (Berkeley) 5/4/95
35 */
36
37/*
38 * The follow should be set to reflect the type of system you have:
39 *	JOBS -> 1 if you have Berkeley job control, 0 otherwise.
40 *	SHORTNAMES -> 1 if your linker cannot handle long names.
41 *	define BSD if you are running 4.2 BSD or later.
42 *	define SYSV if you are running under System V.
43 *	define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
44 *	define DEBUG=2 to compile in and turn on debugging.
45 *	define DO_SHAREDVFORK to indicate that vfork(2) shares its address
46 *	       with its parent.
47 *
48 * When debugging is on, debugging info will be written to ./trace and
49 * a quit signal will generate a core dump.
50 */
51
52#include <zircon/compiler.h>
53#include <sys/param.h>
54
55#ifndef JOBS
56#define JOBS 1
57#endif
58#ifndef BSD
59#define BSD 1
60#endif
61
62#ifndef DO_SHAREDVFORK
63#if __NetBSD_Version__ >= 104000000
64#define DO_SHAREDVFORK
65#endif
66#endif
67
68typedef void *pointer;
69#ifndef NULL
70#define NULL (void *)0
71#endif
72#define STATIC static
73#define MKINIT	/* empty */
74
75extern char nullstr[1];		/* null string */
76
77
78#ifdef DEBUG
79#define TRACE(param)	trace param
80#define TRACEV(param)	tracev param
81#else
82#define TRACE(param)
83#define TRACEV(param)
84#endif
85
86#if defined(__GNUC__) && __GNUC__ < 3
87#define va_copy __va_copy
88#endif
89
90#if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
91#define __builtin_expect(x, expected_value) (x)
92#endif
93
94#ifndef likely
95#define likely(x)	__builtin_expect(!!(x),1)
96#endif
97
98#ifndef unlikely
99#define unlikely(x)	__builtin_expect(!!(x),0)
100#endif
101
102/*
103 * Hack to calculate maximum length.
104 * (length * 8 - 1) * log10(2) + 1 + 1 + 12
105 * The second 1 is for the minus sign and the 12 is a safety margin.
106 */
107static inline int max_int_length(int bytes)
108{
109	return (bytes * 8 - 1) * 0.30102999566398119521 + 14;
110}
111