xref: /original-bsd/bin/sh/parser.h (revision 14dedd6e)
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  * %sccs.include.redist.c%
9  *
10  *	@(#)parser.h	8.3 (Berkeley) 05/04/95
11  */
12 
13 /* control characters in argument strings */
14 #define CTLESC '\201'
15 #define CTLVAR '\202'
16 #define CTLENDVAR '\203'
17 #define CTLBACKQ '\204'
18 #define CTLQUOTE 01		/* ored with CTLBACKQ code if in quotes */
19 /*	CTLBACKQ | CTLQUOTE == '\205' */
20 #define	CTLARI	'\206'
21 #define	CTLENDARI '\207'
22 
23 /* variable substitution byte (follows CTLVAR) */
24 #define VSTYPE	0x0f		/* type of variable substitution */
25 #define VSNUL	0x10		/* colon--treat the empty string as unset */
26 #define VSQUOTE 0x80		/* inside double quotes--suppress splitting */
27 
28 /* values of VSTYPE field */
29 #define VSNORMAL	0x1		/* normal variable:  $var or ${var} */
30 #define VSMINUS		0x2		/* ${var-text} */
31 #define VSPLUS		0x3		/* ${var+text} */
32 #define VSQUESTION	0x4		/* ${var?message} */
33 #define VSASSIGN	0x5		/* ${var=text} */
34 #define VSTRIMLEFT	0x6		/* ${var#pattern} */
35 #define VSTRIMLEFTMAX	0x7		/* ${var##pattern} */
36 #define VSTRIMRIGHT	0x8		/* ${var%pattern} */
37 #define VSTRIMRIGHTMAX 	0x9		/* ${var%%pattern} */
38 #define VSLENGTH	0xa		/* ${#var} */
39 
40 
41 /*
42  * NEOF is returned by parsecmd when it encounters an end of file.  It
43  * must be distinct from NULL, so we use the address of a variable that
44  * happens to be handy.
45  */
46 extern int tokpushback;
47 #define NEOF ((union node *)&tokpushback)
48 extern int whichprompt;		/* 1 == PS1, 2 == PS2 */
49 
50 
51 union node *parsecmd __P((int));
52 void fixredir __P((union node *, const char *, int));
53 int goodname __P((char *));
54 char *getprompt __P((void *));
55