1/*	$NetBSD: metachar.c,v 1.10 2021/06/21 18:54:41 rillig Exp $	*/
2
3/*
4 * Copyright (c) 2015 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#if HAVE_NBTOOL_CONFIG_H
33#include "nbtool_config.h"
34#endif
35
36#if defined(MAKE_NATIVE) || defined(HAVE_NBTOOL_CONFIG_H)
37#include <sys/cdefs.h>
38#endif
39
40#include "metachar.h"
41
42MAKE_RCSID("$NetBSD: metachar.c,v 1.10 2021/06/21 18:54:41 rillig Exp $");
43
44/*
45 * The following array is used to make a fast determination of which
46 * characters are interpreted specially by the shell.  If a command
47 * contains any of these characters, it is executed by the shell, not
48 * directly by us.
49 */
50
51const unsigned char _metachar[128] = {
52/*    nul   soh   stx   etx   eot   enq   ack   bel */
53	1,    0,    0,    0,    0,    0,    0,    0,
54/*     bs    ht    nl    vt    np    cr    so    si */
55	0,    0,    1,    0,	0,    0,    0,    0,
56/*    dle   dc1   dc2   dc3   dc4   nak   syn   etb */
57	0,    0,    0,    0,    0,    0,    0,    0,
58/*    can    em   sub   esc    fs    gs    rs    us */
59	0,    0,    0,    0,    0,    0,    0,    0,
60/*     sp     !     "     #     $     %     &     ' */
61	0,    1,    1,    1,    1,    0,    1,    1,
62/*      (     )     *     +     ,     -     .     / */
63	1,    1,    1,    0,    0,    0,    0,    0,
64/*      0     1     2     3     4     5     6     7 */
65	0,    0,    0,    0,    0,    0,    0,    0,
66/*      8     9     :     ;     <     =     >     ? */
67	0,    0,    0,    1,    1,    0,    1,    1,
68/*      @     A     B     C     D     E     F     G */
69	0,    0,    0,    0,    0,    0,    0,    0,
70/*      H     I     J     K     L     M     N     O */
71	0,    0,    0,    0,    0,    0,    0,    0,
72/*      P     Q     R     S     T     U     V     W */
73	0,    0,    0,    0,    0,    0,    0,    0,
74/*      X     Y     Z     [     \     ]     ^     _ */
75	0,    0,    0,    1,    1,    1,    1,    0,
76/*      `     a     b     c     d     e     f     g */
77	1,    0,    0,    0,    0,    0,    0,    0,
78/*      h     i     j     k     l     m     n     o */
79	0,    0,    0,    0,    0,    0,    0,    0,
80/*      p     q     r     s     t     u     v     w */
81	0,    0,    0,    0,    0,    0,    0,    0,
82/*      x     y     z     {     |     }     ~   del */
83	0,    0,    0,    1,    1,    1,    1,    0,
84};
85