parser.h revision 1.20 
1/*	$NetBSD: parser.h,v 1.20 2016/03/27 14:39:33 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  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 *	@(#)parser.h	8.3 (Berkeley) 5/4/95
35 */
36
37/* control characters in argument strings */
38#define CTL_FIRST '\201'	/* first 'special' character */
39#define CTLESC '\201'		/* escape next character */
40#define CTLVAR '\202'		/* variable defn */
41#define CTLENDVAR '\203'
42#define CTLBACKQ '\204'
43#define CTLQUOTE 01		/* ored with CTLBACKQ code if in quotes */
44/*	CTLBACKQ | CTLQUOTE == '\205' */
45#define	CTLARI	'\206'		/* arithmetic expression */
46#define	CTLENDARI '\207'
47#define	CTLQUOTEMARK '\210'
48#define	CTLQUOTEEND '\211'	/* only inside ${...} */
49#define	CTL_LAST '\211'		/* last 'special' character */
50
51/* variable substitution byte (follows CTLVAR) */
52#define VSTYPE		0x0f	/* type of variable substitution */
53#define VSNUL		0x10	/* colon--treat the empty string as unset */
54#define VSLINENO	0x20	/* expansion of $LINENO, the line number
55				   follows immediately */
56#define VSPATQ		0x40	/* ensure correct pattern quoting in ${x#pat} */
57#define VSQUOTE	 	0x80	/* inside double quotes--suppress splitting */
58
59/* values of VSTYPE field */
60#define VSNORMAL	0x1		/* normal variable:  $var or ${var} */
61#define VSMINUS		0x2		/* ${var-text} */
62#define VSPLUS		0x3		/* ${var+text} */
63#define VSQUESTION	0x4		/* ${var?message} */
64#define VSASSIGN	0x5		/* ${var=text} */
65#define VSTRIMLEFT	0x6		/* ${var#pattern} */
66#define VSTRIMLEFTMAX	0x7		/* ${var##pattern} */
67#define VSTRIMRIGHT	0x8		/* ${var%pattern} */
68#define VSTRIMRIGHTMAX 	0x9		/* ${var%%pattern} */
69#define VSLENGTH	0xa		/* ${#var} */
70
71
72/*
73 * NEOF is returned by parsecmd when it encounters an end of file.  It
74 * must be distinct from NULL, so we use the address of a variable that
75 * happens to be handy.
76 */
77extern int tokpushback;
78#define NEOF ((union node *)&tokpushback)
79extern int whichprompt;		/* 1 == PS1, 2 == PS2 */
80
81
82union node *parsecmd(int);
83void fixredir(union node *, const char *, int);
84void parse_heredoc(union node *);
85int goodname(char *);
86const char *getprompt(void *);
87