centralize shell metachar handling.
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christos
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/* $NetBSD: metachar.c,v 1.1 2015/06/17 15:34:55 christos Exp $ */
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/*-
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* Copyright (c) 2015 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: metachar.c,v 1.1 2015/06/17 15:34:55 christos Exp $");
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#include "metachar.h"
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/*
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* The following array is used to make a fast determination of which
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* characters are interpreted specially by the shell. If a command
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* contains any of these characters, it is executed by the shell, not
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* directly by us.
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*
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* perhaps move it to ctype?
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*/
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unsigned char _metachar[128] = {
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// nul soh stx etx eot enq ack bel
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1, 0, 0, 0, 0, 0, 0, 0,
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// bs ht nl vt np cr so si
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0, 1, 1, 0, 0, 0, 0, 0,
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// dle dc1 dc2 dc3 dc4 nak syn etb
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0, 0, 0, 0, 0, 0, 0, 0,
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// can em sub esc fs gs rs us
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0, 0, 0, 0, 0, 0, 0, 0,
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// sp ! " # $ % & '
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1, 1, 1, 1, 1, 0, 1, 1,
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// ( ) * + , - . /
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1, 1, 1, 0, 0, 0, 0, 0,
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// 0 1 2 3 4 5 6 7
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0, 0, 0, 0, 0, 0, 0, 0,
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// 8 9 : ; < = > ?
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0, 0, 0, 1, 1, 0, 1, 1,
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// @ A B C D E F G
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0, 0, 0, 0, 0, 0, 0, 0,
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// H I J K L M N O
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0, 0, 0, 0, 0, 0, 0, 0,
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// P Q R S T U V W
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0, 0, 0, 0, 0, 0, 0, 0,
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// X Y Z [ \ ] ^ _
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0, 0, 0, 1, 1, 1, 1, 0,
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// ` a b c d e f g
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1, 0, 0, 0, 0, 0, 0, 0,
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// h i j k l m n o
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0, 0, 0, 0, 0, 0, 0, 0,
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// p q r s t u v w
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0, 0, 0, 0, 0, 0, 0, 0,
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// x y z { | } ~ del
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0, 0, 0, 1, 1, 1, 1, 0,
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};
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@ -0,0 +1,51 @@
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/* $NetBSD: metachar.h,v 1.1 2015/06/17 15:34:55 christos Exp $ */
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/*-
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* Copyright (c) 2015 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _METACHAR_H
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#define _METACHAR_H
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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extern unsigned char _metachar[];
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#define ismeta(c) _metachar[(c) & 0x7f]
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static inline int
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hasmeta(const char *cmd)
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{
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while (!ismeta(*cmd))
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cmd++;
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return *cmd != '\0';
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}
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__END_DECLS
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#endif /* _METACHAR_H */
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