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
68 typedef void *pointer;
69 #ifndef NULL
70 #define NULL (void *)0
71 #endif
72 #define STATIC static
73 #define MKINIT /* empty */
74
75 extern 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 */
max_int_length(int bytes)107 static inline int max_int_length(int bytes)
108 {
109 return (bytes * 8 - 1) * 0.30102999566398119521 + 14;
110 }
111