summaryrefslogtreecommitdiff
path: root/table.h
blob: add68efd3672827d2c1f6ba2f52a68670902f6ad (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
/* $NetBSD: table.h,v 1.4 2018/06/03 12:18:29 kamil Exp $ */

/*
 * generic hashed associative table for commands and variables.
 */

struct table {
	Area   *areap;		/* area to allocate entries */
	short	size, nfree;	/* hash size (always 2^^n), free entries */
	struct	tbl **tbls;	/* hashed table items */
};

struct tbl {			/* table item */
	Tflag	flag;		/* flags */
	int	type;		/* command type (see below), base (if INTEGER),
				 * or offset from val.s of value (if EXPORT) */
	Area	*areap;		/* area to allocate from */
	union {
		char *s;	/* string */
		long i;		/* integer */
		int (*f) ARGS((char **));	/* int function */
		struct op *t;	/* "function" tree */
	} val;			/* value */
	int	index;		/* index for an array */
	union {
	    int	field;		/* field with for -L/-R/-Z */
	    int errno_;		/* CEXEC/CTALIAS */
	} u2;
	union {
		struct tbl *array;	/* array values */
		char *fpath;		/* temporary path to undef function */
	} u;
	char	name[4];	/* name -- variable length */
};

/* common flag bits */
#define	ALLOC		BIT(0)	/* val.s has been allocated */
#define	DEFINED		BIT(1)	/* is defined in block */
#define	ISSET		BIT(2)	/* has value, vp->val.[si] */
#define	EXPORT		BIT(3)	/* exported variable/function */
#define	TRACE		BIT(4)	/* var: user flagged, func: execution tracing */
/* (start non-common flags at 8) */
/* flag bits used for variables */
#define	SPECIAL		BIT(8)	/* PATH, IFS, SECONDS, etc */
#define	INTEGER		BIT(9)	/* val.i contains integer value */
#define	RDONLY		BIT(10)	/* read-only variable */
#define	LOCAL		BIT(11)	/* for local typeset() */
#define ARRAY		BIT(13)	/* array */
#define LJUST		BIT(14)	/* left justify */
#define RJUST		BIT(15)	/* right justify */
#define ZEROFIL		BIT(16)	/* 0 filled if RJUSTIFY, strip 0s if LJUSTIFY */
#define LCASEV		BIT(17)	/* convert to lower case */
#define UCASEV_AL	BIT(18)/* convert to upper case / autoload function */
#define INT_U		BIT(19)	/* unsigned integer */
#define INT_L		BIT(20)	/* long integer (no-op) */
#define IMPORT		BIT(21)	/* flag to typeset(): no arrays, must have = */
#define LOCAL_COPY	BIT(22)	/* with LOCAL - copy attrs from existing var */
#define EXPRINEVAL	BIT(23)	/* contents currently being evaluated */
#define EXPRLVALUE	BIT(24)	/* useable as lvalue (temp flag) */
/* flag bits used for taliases/builtins/aliases/keywords/functions */
#define KEEPASN		BIT(8)	/* keep command assignments (eg, var=x cmd) */
#define FINUSE		BIT(9)	/* function being executed */
#define FDELETE		BIT(10)	/* function deleted while it was executing */
#define FKSH		BIT(11)	/* function defined with function x (vs x()) */
#define SPEC_BI		BIT(12)	/* a POSIX special builtin */
#define REG_BI		BIT(13)	/* a POSIX regular builtin */
/* Attributes that can be set by the user (used to decide if an unset param
 * should be repoted by set/typeset).  Does not include ARRAY or LOCAL.
 */
#define USERATTRIB	(EXPORT|INTEGER|RDONLY|LJUST|RJUST|ZEROFIL\
			 |LCASEV|UCASEV_AL|INT_U|INT_L)

/* command types */
#define	CNONE	0		/* undefined */
#define	CSHELL	1		/* built-in */
#define	CFUNC	2		/* function */
#define	CEXEC	4		/* executable command */
#define	CALIAS	5		/* alias */
#define	CKEYWD	6		/* keyword */
#define CTALIAS	7		/* tracked alias */

/* Flags for findcom()/comexec() */
#define FC_SPECBI	BIT(0)	/* special builtin */
#define FC_FUNC		BIT(1)	/* function builtin */
#define FC_REGBI	BIT(2)	/* regular builtin */
#define FC_UNREGBI	BIT(3)	/* un-regular builtin (!special,!regular) */
#define FC_BI		(FC_SPECBI|FC_REGBI|FC_UNREGBI)
#define FC_PATH		BIT(4)	/* do path search */
#define FC_DEFPATH	BIT(5)	/* use default path in path search */


#define AF_ARGV_ALLOC	0x1	/* argv[] array allocated */
#define AF_ARGS_ALLOCED	0x2	/* argument strings allocated */
#define AI_ARGV(a, i)	((i) == 0 ? (a).argv[0] : (a).argv[(i) - (a).skip])
#define AI_ARGC(a)	((a).argc_ - (a).skip)

/* Argument info.  Used for $#, $* for shell, functions, includes, etc. */
struct arg_info {
	int flags;	/* AF_* */
	char **argv;
	int argc_;
	int skip;	/* first arg is argv[0], second is argv[1 + skip] */
};

/*
 * activation record for function blocks
 */
struct block {
	Area	area;		/* area to allocate things */
	/*struct arg_info argi;*/
	char	**argv;
	int	argc;
	int	flags;		/* see BF_* */
	struct	table vars;	/* local variables */
	struct	table funs;	/* local functions */
	Getopt	getopts_state;
#if 1
	char *	error;		/* error handler */
	char *	exit;		/* exit handler */
#else
	Trap	error, exit;
#endif
	struct	block *next;	/* enclosing block */
};

/* Values for struct block.flags */
#define BF_DOGETOPTS	BIT(0)	/* save/restore getopts state */

/*
 * Used by ksh_twalk() and tnext() routines.
 */
struct tstate {
	int left;
	struct tbl **next;
};


EXTERN	struct table taliases;	/* tracked aliases */
EXTERN	struct table builtins;	/* built-in commands */
EXTERN	struct table aliases;	/* aliases */
EXTERN	struct table keywords;	/* keywords */
EXTERN	struct table homedirs;	/* homedir() cache */

struct builtin {
	const char   *name;
	int  (*func) ARGS((char **));
};

/* these really are externs! Look in table.c for them */
extern const struct builtin shbuiltins [], kshbuiltins [];

/* var spec values */
#define	V_NONE			0
#define	V_PATH			1
#define	V_IFS			2
#define	V_SECONDS		3
#define	V_OPTIND		4
#define	V_MAIL			5
#define	V_MAILPATH		6
#define	V_MAILCHECK		7
#define	V_RANDOM		8
#define V_HISTSIZE		9
#define V_HISTFILE		10
#define V_VISUAL		11
#define V_EDITOR		12
#define V_COLUMNS		13
#define V_POSIXLY_CORRECT	14
#define V_TMOUT			15
#define V_TMPDIR		16
#define V_LINENO		17

/* values for set_prompt() */
#define PS1	0		/* command */
#define PS2	1		/* command continuation */

EXTERN char *path;		/* copy of either PATH or def_path */
EXTERN const char *def_path;	/* path to use if PATH not set */
EXTERN char *tmpdir;		/* TMPDIR value */
EXTERN const char *prompt;
EXTERN int cur_prompt;		/* PS1 or PS2 */
EXTERN int current_lineno;	/* LINENO value */