1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*
* Plan9 is defined for plan 9
* V9 is defined for 9th edition
* Sun is defined for sun-os
* Please don't litter the code with ifdefs. The three below (and one in
* getflags) should be enough.
*/
#define Plan9
#ifdef Plan9
#include <u.h>
#include <libc.h>
#undef NSIG
#undef SIGINT
#undef SIGQUIT
#define NSIG 32
#define SIGINT 2
#define SIGQUIT 3
#endif
#ifdef V9
#include <signal.h>
#include <libc.h>
#endif
#ifdef Sun
#include <signal.h>
#endif
#define YYMAXDEPTH 500
#ifndef PAREN
#ifndef YYMAJOR
#include "x.tab.h"
#endif
#endif
#undef pipe /* so that /dev/fd works */
#define searchpath rcsearchpath /* avoid new libc function */
/* some systems define a global "var", "thread" */
#undef var
#define var rcvar
#undef thread
#define thread rcthread
typedef struct tree tree;
typedef struct word word;
typedef struct io io;
typedef union code code;
typedef struct var var;
typedef struct list list;
typedef struct redir redir;
typedef struct thread thread;
typedef struct builtin builtin;
struct tree{
int type;
int rtype, fd0, fd1; /* details of REDIR PIPE DUP tokens */
char *str;
int quoted;
int iskw;
tree *child[3];
tree *next;
};
tree *newtree(void);
tree *token(char*, int), *klook(char*), *tree1(int, tree*);
tree *tree2(int, tree*, tree*), *tree3(int, tree*, tree*, tree*);
tree *mung1(tree*, tree*), *mung2(tree*, tree*, tree*);
tree *mung3(tree*, tree*, tree*, tree*), *epimung(tree*, tree*);
tree *simplemung(tree*), *heredoc(tree*);
void freetree(tree*);
tree *cmdtree;
/*
* The first word of any code vector is a reference count.
* Always create a new reference to a code vector by calling codecopy(.).
* Always call codefree(.) when deleting a reference.
*/
union code{
void (*f)(void);
int i;
char *s;
};
char *promptstr;
#define NTOK 8192
char tok[NTOK];
#define APPEND 1
#define WRITE 2
#define READ 3
#define HERE 4
#define DUPFD 5
#define CLOSE 6
#define RDWR 7
struct var{
char *name; /* ascii name */
word *val; /* value */
int changed;
code *fn; /* pointer to function's code vector */
int fnchanged;
int pc; /* pc of start of function */
var *next; /* next on hash or local list */
void (*changefn)(var*);
};
var *vlook(char*), *gvlook(char*), *newvar(char*, var*);
#define NVAR 521
var *gvar[NVAR]; /* hash for globals */
#define new(type) ((type *)emalloc(sizeof(type)))
char *emalloc(long);
void *Malloc(ulong);
void efree(char*);
#define NOFILE 128 /* should come from <param.h> */
struct here{
tree *tag;
char *name;
struct here *next;
};
int mypid;
/*
* Glob character escape in strings:
* In a string, GLOB must be followed by *?[ or GLOB.
* GLOB* matches any string
* GLOB? matches any single character
* GLOB[...] matches anything in the brackets
* GLOBGLOB matches GLOB
*/
#define GLOB ((char)0x01)
/*
* onebyte(c), twobyte(c), threebyte(c)
* Is c the first character of a one- two- or three-byte utf sequence?
*/
#define onebyte(c) ((c&0x80)==0x00)
#define twobyte(c) ((c&0xe0)==0xc0)
#define threebyte(c) ((c&0xf0)==0xe0)
#define fourbyte(c) ((c&0xf8)==0xf0)
char **argp;
char **args;
int nerror; /* number of errors encountered during compilation */
extern int doprompt; /* is it time for a prompt? */
/*
* Which fds are the reading/writing end of a pipe?
* Unfortunately, this can vary from system to system.
* 9th edition Unix doesn't care, the following defines
* work on plan 9.
*/
#define PRD 0
#define PWR 1
extern char *Rcmain(), Fdprefix[];
#define register
/*
* How many dot commands have we executed?
* Used to ensure that -v flag doesn't print rcmain.
*/
int ndot;
char *getstatus(void);
int lastc;
int lastword;
int kidpid;
|