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 	void	(*changefn)(var*);
88 };
89 var *vlook(char*), *gvlook(char*), *newvar(char*, var*);
90 #define	NVAR	521
91 var *gvar[NVAR];				/* hash for globals */
92 #define	new(type)	((type *)emalloc(sizeof(type)))
93 char *emalloc(long);
94 void *Malloc(ulong);
95 void efree(char*);
96 #define	NOFILE	128		/* should come from <param.h> */
97 struct here{
98 	tree *tag;
99 	char *name;
100 	struct here *next;
101 };
102 int mypid;
103 /*
104  * Glob character escape in strings:
105  *	In a string, GLOB must be followed by *?[ or GLOB.
106  *	GLOB* matches any string
107  *	GLOB? matches any single character
108  *	GLOB[...] matches anything in the brackets
109  *	GLOBGLOB matches GLOB
110  */
111 #define	GLOB	((char)0x01)
112 /*
113  * onebyte(c), twobyte(c), threebyte(c)
114  * Is c the first character of a one- two- or three-byte utf sequence?
115  */
116 #define	onebyte(c)	((c&0x80)==0x00)
117 #define	twobyte(c)	((c&0xe0)==0xc0)
118 #define	threebyte(c)	((c&0xf0)==0xe0)
119 char **argp;
120 char **args;
121 int nerror;		/* number of errors encountered during compilation */
122 int doprompt;		/* is it time for a prompt? */
123 /*
124  * Which fds are the reading/writing end of a pipe?
125  * Unfortunately, this can vary from system to system.
126  * 9th edition Unix doesn't care, the following defines
127  * work on plan 9.
128  */
129 #define	PRD	0
130 #define	PWR	1
131 extern char *Rcmain(), Fdprefix[];
132 #define	register
133 /*
134  * How many dot commands have we executed?
135  * Used to ensure that -v flag doesn't print rcmain.
136  */
137 int ndot;
138 char *getstatus(void);
139 int lastc;
140 int lastword;
141 int kidpid;