1 /*
2  * Plan9 is defined for plan 9
3  * V9 is defined for 9th edition
4  * Sun is defined for sun-os
5  * Please don't litter the code with ifdefs.  The three below (and one in
6  * getflags) should be enough.
7  */
8 #define	Plan9
9 #ifdef	Plan9
10 #include <u.h>
11 #include <libc.h>
12 #define	NSIG	32
13 #define	SIGINT	2
14 #define	SIGQUIT	3
15 #endif
16 #ifdef	V9
17 #include <signal.h>
18 #include <libc.h>
19 #endif
20 #ifdef Sun
21 #include <signal.h>
22 #endif
23 #define	YYMAXDEPTH	500
24 #ifndef PAREN
25 #ifndef YYMAJOR
26 #include "x.tab.h"
27 #endif
28 #endif
29 typedef struct tree tree;
30 typedef struct word word;
31 typedef struct io io;
32 typedef union code code;
33 typedef struct var var;
34 typedef struct list list;
35 typedef struct redir redir;
36 typedef struct thread thread;
37 typedef struct builtin builtin;
38 
39 struct tree{
40 	int type;
41 	int rtype, fd0, fd1;		/* details of REDIR PIPE DUP tokens */
42 	char *str;
43 	int quoted;
44 	int iskw;
45 	tree *child[3];
46 	tree *next;
47 };
48 tree *newtree(void);
49 tree *token(char*, int), *klook(char*), *tree1(int, tree*);
50 tree *tree2(int, tree*, tree*), *tree3(int, tree*, tree*, tree*);
51 tree *mung1(tree*, tree*), *mung2(tree*, tree*, tree*);
52 tree *mung3(tree*, tree*, tree*, tree*), *epimung(tree*, tree*);
53 tree *simplemung(tree*), *heredoc(tree*);
54 void freetree(tree*);
55 tree *cmdtree;
56 /*
57  * The first word of any code vector is a reference count.
58  * Always create a new reference to a code vector by calling codecopy(.).
59  * Always call codefree(.) when deleting a reference.
60  */
61 union code{
62 	void (*f)(void);
63 	int i;
64 	char *s;
65 };
66 char *promptstr;
67 int doprompt;
68 #define	NTOK	8192
69 char tok[NTOK];
70 #define	APPEND	1
71 #define	WRITE	2
72 #define	READ	3
73 #define	HERE	4
74 #define	DUPFD	5
75 #define	CLOSE	6
76 struct var{
77 	char *name;		/* ascii name */
78 	word *val;	/* value */
79 	int changed;
80 	code *fn;		/* pointer to function's code vector */
81 	int fnchanged;
82 	int pc;			/* pc of start of function */
83 	var *next;	/* next on hash or local list */
84 };
85 var *vlook(char*), *gvlook(char*), *newvar(char*, var*);
86 #define	NVAR	521
87 var *gvar[NVAR];				/* hash for globals */
88 #define	new(type)	((type *)emalloc(sizeof(type)))
89 char *emalloc(long);
90 void *Malloc(ulong);
91 void efree(char*);
92 #define	NOFILE	128		/* should come from <param.h> */
93 struct here{
94 	tree *tag;
95 	char *name;
96 	struct here *next;
97 };
98 int mypid;
99 /*
100  * Glob character escape in strings:
101  *	In a string, GLOB must be followed by *?[ or GLOB.
102  *	GLOB* matches any string
103  *	GLOB? matches any single character
104  *	GLOB[...] matches anything in the brackets
105  *	GLOBGLOB matches GLOB
106  */
107 #define	GLOB	((char)0x01)
108 /*
109  * onebyte(c), twobyte(c), threebyte(c)
110  * Is c the first character of a one- two- or three-byte utf sequence?
111  */
112 #define	onebyte(c)	((c&0x80)==0x00)
113 #define	twobyte(c)	((c&0xe0)==0xc0)
114 #define	threebyte(c)	((c&0xf0)==0xe0)
115 char **argp;
116 char **args;
117 int nerror;		/* number of errors encountered during compilation */
118 int doprompt;		/* is it time for a prompt? */
119 /*
120  * Which fds are the reading/writing end of a pipe?
121  * Unfortunately, this can vary from system to system.
122  * 9th edition Unix doesn't care, the following defines
123  * work on plan 9.
124  */
125 #define	PRD	0
126 #define	PWR	1
127 extern char *Rcmain(), Fdprefix[];
128 #define	register
129 /*
130  * How many dot commands have we executed?
131  * Used to ensure that -v flag doesn't print rcmain.
132  */
133 int ndot;
134 char *getstatus(void);
135 int lastc;
136 int lastword;