xref: /freebsd/bin/sh/parser.h (revision 195ebc7e9e4b129de810833791a19dfb4349d6a9)
1 /*-
2  * Copyright (c) 1991, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Kenneth Almquist.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 4. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  *	@(#)parser.h	8.3 (Berkeley) 5/4/95
33  * $FreeBSD$
34  */
35 
36 /* control characters in argument strings */
37 #define CTLESC '\201'
38 #define CTLVAR '\202'
39 #define CTLENDVAR '\203'
40 #define CTLBACKQ '\204'
41 #define CTLQUOTE 01		/* ored with CTLBACKQ code if in quotes */
42 /*	CTLBACKQ | CTLQUOTE == '\205' */
43 #define	CTLARI	'\206'
44 #define	CTLENDARI '\207'
45 #define	CTLQUOTEMARK '\210'
46 
47 /* variable substitution byte (follows CTLVAR) */
48 #define VSTYPE		0x0f	/* type of variable substitution */
49 #define VSNUL		0x10	/* colon--treat the empty string as unset */
50 #define VSLINENO	0x20	/* expansion of $LINENO, the line number \
51 				   follows immediately */
52 #define VSQUOTE		0x80	/* inside double quotes--suppress splitting */
53 
54 /* values of VSTYPE field */
55 #define VSNORMAL	0x1		/* normal variable:  $var or ${var} */
56 #define VSMINUS		0x2		/* ${var-text} */
57 #define VSPLUS		0x3		/* ${var+text} */
58 #define VSQUESTION	0x4		/* ${var?message} */
59 #define VSASSIGN	0x5		/* ${var=text} */
60 #define VSTRIMLEFT	0x6		/* ${var#pattern} */
61 #define VSTRIMLEFTMAX	0x7		/* ${var##pattern} */
62 #define VSTRIMRIGHT	0x8		/* ${var%pattern} */
63 #define VSTRIMRIGHTMAX 	0x9		/* ${var%%pattern} */
64 #define VSLENGTH	0xa		/* ${#var} */
65 #define VSERROR		0xb		/* Syntax error, issue when expanded */
66 
67 
68 /*
69  * NEOF is returned by parsecmd when it encounters an end of file.  It
70  * must be distinct from NULL, so we use the address of a variable that
71  * happens to be handy.
72  */
73 extern int tokpushback;
74 #define NEOF ((union node *)&tokpushback)
75 extern int whichprompt;		/* 1 == PS1, 2 == PS2 */
76 
77 
78 union node *parsecmd(int);
79 void fixredir(union node *, const char *, int);
80 int goodname(char *);
81 char *getprompt(void *);
82