xref: /dragonfly/bin/sh/parser.h (revision a31d3627)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
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  * $FreeBSD: head/bin/sh/parser.h 326025 2017-11-20 19:49:47Z pfg $
36  */
37 
38 /* control characters in argument strings */
39 #define CTLESC '\300'
40 #define CTLVAR '\301'
41 #define CTLENDVAR '\371'
42 #define CTLBACKQ '\372'
43 #define CTLQUOTE 01		/* ored with CTLBACKQ code if in quotes */
44 /*	CTLBACKQ | CTLQUOTE == '\373' */
45 #define	CTLARI	'\374'
46 #define	CTLENDARI '\375'
47 #define	CTLQUOTEMARK '\376'
48 #define	CTLQUOTEEND '\377' /* only for ${v+-...} */
49 
50 /* variable substitution byte (follows CTLVAR) */
51 #define VSTYPE		0x0f	/* type of variable substitution */
52 #define VSNUL		0x10	/* colon--treat the empty string as unset */
53 #define VSLINENO	0x20	/* expansion of $LINENO, the line number \
54 				   follows immediately */
55 #define VSQUOTE		0x80	/* inside double quotes--suppress splitting */
56 
57 /* values of VSTYPE field */
58 #define VSNORMAL	0x1		/* normal variable:  $var or ${var} */
59 #define VSMINUS		0x2		/* ${var-text} */
60 #define VSPLUS		0x3		/* ${var+text} */
61 #define VSQUESTION	0x4		/* ${var?message} */
62 #define VSASSIGN	0x5		/* ${var=text} */
63 #define VSTRIMLEFT	0x6		/* ${var#pattern} */
64 #define VSTRIMLEFTMAX	0x7		/* ${var##pattern} */
65 #define VSTRIMRIGHT	0x8		/* ${var%pattern} */
66 #define VSTRIMRIGHTMAX 	0x9		/* ${var%%pattern} */
67 #define VSLENGTH	0xa		/* ${#var} */
68 #define VSERROR		0xb		/* Syntax error, issue when expanded */
69 
70 
71 /*
72  * NEOF is returned by parsecmd when it encounters an end of file.  It
73  * must be distinct from NULL.
74  */
75 #define NEOF ((union node *)-1)
76 extern int whichprompt;		/* 1 == PS1, 2 == PS2 */
77 extern const char *const parsekwd[];
78 
79 
80 union node *parsecmd(int);
81 union node *parsewordexp(void);
82 void forcealias(void);
83 void fixredir(union node *, const char *, int);
84 int goodname(const char *);
85 int isassignment(const char *);
86 char *getprompt(void *);
87 const char *expandstr(const char *);
88