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