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      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 
     42 MAKE_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 
     51 const 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