021ba5091c
to have them, they should work as documented, not cause core dumps, reference after free, incorrect replacements, failing to implement alias after alias, ... The big comment that ended: This is a good idea ------- ***NOT*** and the hack it was describing are gone. Note that most of this was from original CVS version 1.1 code (ie: came from the original import, even before 4.4-Lite was merged. That is, May 1994. And no-one in 24.5 years noticed (or at least complained about) all the bugs (or at least, most of them)). With these changes, aliases ought to work (if you can call it that) as they are expected to by POSIX. Now if only we could get POSIX to delete them (or make them optional)... Changes partly inspired by similar changes made by FreeBSD, (as was the previous change to alias.c, forgot ack in commit log for that one, apologies) but done a little differently, and perhaps with a slightly better outcome.
99 lines
4.0 KiB
C
99 lines
4.0 KiB
C
/* $NetBSD: syntax.h,v 1.11 2018/12/03 06:40:26 kre Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <ctype.h>
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/* Syntax classes */
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#define CWORD 0 /* character is nothing special */
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#define CNL 1 /* newline character */
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#define CBACK 2 /* a backslash character */
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#define CSQUOTE 3 /* single quote */
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#define CDQUOTE 4 /* double quote */
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#define CBQUOTE 5 /* backwards single quote */
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#define CVAR 6 /* a dollar sign */
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#define CENDVAR 7 /* a '}' character */
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#define CLP 8 /* a left paren in arithmetic */
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#define CRP 9 /* a right paren in arithmetic */
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#define CEOF 10 /* end of file */
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#define CSPCL 11 /* these terminate a word */
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#define CCTL 12 /* like CWORD, except it must be escaped */
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#define CSBACK 13 /* a backslash in a single quote syntax */
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#define CFAKE 14 /* a delimiter that does not exist */
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/*
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* note CSBACK == (CCTL|1)
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* the code does not rely upon that, but keeping it allows a
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* smart enough compiler to optimise some tests
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*/
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/* Syntax classes for is_ functions */
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#define ISDIGIT 01 /* a digit */
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#define ISUPPER 02 /* an upper case letter */
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#define ISLOWER 04 /* a lower case letter */
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#define ISUNDER 010 /* an underscore */
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#define ISSPECL 020 /* the name of a special parameter */
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#define ISSPACE 040 /* a white space character */
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#define PEOF (CHAR_MIN - 1)
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#define PFAKE (CHAR_MIN - 2)
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#define SYNBASE (-PFAKE)
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#define BASESYNTAX (basesyntax + SYNBASE)
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#define DQSYNTAX (dqsyntax + SYNBASE)
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#define SQSYNTAX (sqsyntax + SYNBASE)
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#define ARISYNTAX (arisyntax + SYNBASE)
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/* These defines assume that the digits are contiguous (which is guaranteed) */
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#define is_digit(c) ((unsigned)((c) - '0') <= 9)
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#define sh_ctype(c) (is_type+SYNBASE)[(int)(c)]
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#define is_upper(c) (sh_ctype(c) & ISUPPER)
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#define is_lower(c) (sh_ctype(c) & ISLOWER)
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#define is_alpha(c) (sh_ctype(c) & (ISUPPER|ISLOWER))
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#define is_name(c) (sh_ctype(c) & (ISUPPER|ISLOWER|ISUNDER))
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#define is_in_name(c) (sh_ctype(c) & (ISUPPER|ISLOWER|ISUNDER|ISDIGIT))
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#define is_special(c) (sh_ctype(c) & (ISSPECL|ISDIGIT))
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#define is_space(c) (sh_ctype(c) & ISSPACE)
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#define digit_val(c) ((c) - '0')
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/* true if the arg char needs CTLESC to protect it */
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#define NEEDESC(c) (SQSYNTAX[(int)(c)] == CCTL || \
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SQSYNTAX[(int)(c)] == CSBACK)
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extern const char basesyntax[];
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extern const char dqsyntax[];
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extern const char sqsyntax[];
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extern const char arisyntax[];
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extern const char is_type[];
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