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