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 #undef NSIG
13 #undef SIGINT
14 #undef SIGQUIT
15 #define	NSIG	32
16 #define	SIGINT	2
17 #define	SIGQUIT	3
18 #endif
19 #ifdef	V9
20 #include <signal.h>
21 #include <libc.h>
22 #endif
23 #ifdef Sun
24 #include <signal.h>
25 #endif
26 #define	YYMAXDEPTH	500
27 #ifndef PAREN
28 #ifndef YYMAJOR
29 #include "x.tab.h"
30 #endif
31 #endif
32 
33 #undef pipe	/* so that /dev/fd works */
34 #define searchpath rcsearchpath	/* avoid new libc function */
35 
36 /* some systems define a global "var", "thread" */
37 #undef var
38 #define var rcvar
39 #undef thread
40 #define thread rcthread
41 
42 typedef struct tree tree;
43 typedef struct word word;
44 typedef struct io io;
45 typedef union code code;
46 typedef struct var var;
47 typedef struct list list;
48 typedef struct redir redir;
49 typedef struct thread thread;
50 typedef struct builtin builtin;
51 
52 struct tree{
53 	int type;
54 	int rtype, fd0, fd1;		/* details of REDIR PIPE DUP tokens */
55 	char *str;
56 	int quoted;
57 	int iskw;
58 	tree *child[3];
59 	tree *next;
60 };
61 tree *newtree(void);
62 tree *token(char*, int), *klook(char*), *tree1(int, tree*);
63 tree *tree2(int, tree*, tree*), *tree3(int, tree*, tree*, tree*);
64 tree *mung1(tree*, tree*), *mung2(tree*, tree*, tree*);
65 tree *mung3(tree*, tree*, tree*, tree*), *epimung(tree*, tree*);
66 tree *simplemung(tree*), *heredoc(tree*);
67 void freetree(tree*);
68 tree *cmdtree;
69 /*
70  * The first word of any code vector is a reference count.
71  * Always create a new reference to a code vector by calling codecopy(.).
72  * Always call codefree(.) when deleting a reference.
73  */
74 union code{
75 	void (*f)(void);
76 	int i;
77 	char *s;
78 };
79 char *promptstr;
80 #define	NTOK	8192
81 char tok[NTOK];
82 #define	APPEND	1
83 #define	WRITE	2
84 #define	READ	3
85 #define	HERE	4
86 #define	DUPFD	5
87 #define	CLOSE	6
88 #define	RDWR	7
89 struct var{
90 	char *name;		/* ascii name */
91 	word *val;	/* value */
92 	int changed;
93 	code *fn;		/* pointer to function's code vector */
94 	int fnchanged;
95 	int pc;			/* pc of start of function */
96 	var *next;	/* next on hash or local list */
97 	void	(*changefn)(var*);
98 };
99 var *vlook(char*), *gvlook(char*), *newvar(char*, var*);
100 #define	NVAR	521
101 var *gvar[NVAR];				/* hash for globals */
102 #define	new(type)	((type *)emalloc(sizeof(type)))
103 char *emalloc(long);
104 void *Malloc(ulong);
105 void efree(char*);
106 #define	NOFILE	128		/* should come from <param.h> */
107 struct here{
108 	tree *tag;
109 	char *name;
110 	struct here *next;
111 };
112 int mypid;
113 /*
114  * Glob character escape in strings:
115  *	In a string, GLOB must be followed by *?[ or GLOB.
116  *	GLOB* matches any string
117  *	GLOB? matches any single character
118  *	GLOB[...] matches anything in the brackets
119  *	GLOBGLOB matches GLOB
120  */
121 #define	GLOB	((char)0x01)
122 /*
123  * onebyte(c), twobyte(c), threebyte(c)
124  * Is c the first character of a one- two- or three-byte utf sequence?
125  */
126 #define	onebyte(c)	((c&0x80)==0x00)
127 #define	twobyte(c)	((c&0xe0)==0xc0)
128 #define	threebyte(c)	((c&0xf0)==0xe0)
129 #define	fourbyte(c)	((c&0xf8)==0xf0)
130 
131 char **argp;
132 char **args;
133 int nerror;		/* number of errors encountered during compilation */
134 extern int doprompt;		/* is it time for a prompt? */
135 /*
136  * Which fds are the reading/writing end of a pipe?
137  * Unfortunately, this can vary from system to system.
138  * 9th edition Unix doesn't care, the following defines
139  * work on plan 9.
140  */
141 #define	PRD	0
142 #define	PWR	1
143 extern char *Rcmain(), Fdprefix[];
144 #define	register
145 /*
146  * How many dot commands have we executed?
147  * Used to ensure that -v flag doesn't print rcmain.
148  */
149 int ndot;
150 char *getstatus(void);
151 int lastc;
152 int lastword;
153 int kidpid;