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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/* System module */
/*
Various bits of information used by the interpreter are collected in
module 'sys'.
Data members:
- stdin, stdout, stderr: standard file objects
- ps1, ps2: primary and secondary prompts (strings)
- path: module search path (list of strings)
- modules: the table of modules (dictionary)
Function members:
- exit(sts): call exit()
*/
#include <stdio.h>
#include "PROTO.h"
#include "object.h"
#include "stringobject.h"
#include "listobject.h"
#include "dictobject.h"
#include "fileobject.h"
#include "moduleobject.h"
#include "sysmodule.h"
#include "node.h" /* For context.h */
#include "context.h" /* For import.h */
#include "import.h"
#include "methodobject.h"
#include "modsupport.h"
#include "errors.h"
static object *sysdict;
object *
sysget(name)
char *name;
{
return dictlookup(sysdict, name);
}
FILE *
sysgetfile(name, def)
char *name;
FILE *def;
{
FILE *fp = NULL;
object *v = sysget(name);
if (v != NULL)
fp = getfilefile(v);
if (fp == NULL)
fp = def;
return fp;
}
int
sysset(name, v)
char *name;
object *v;
{
if (v == NULL)
return dictremove(sysdict, name);
else
return dictinsert(sysdict, name, v);
}
static object *
makeargv(argc, argv)
int argc;
char **argv;
{
int i;
object *av, *v;
if (argc < 0 || argv == NULL)
argc = 0;
av = newlistobject(argc);
if (av != NULL) {
for (i = 0; i < argc; i++) {
v = newstringobject(argv[i]);
if (v == NULL) {
DECREF(av);
av = NULL;
break;
}
setlistitem(av, i, v);
}
}
if (av == NULL)
fatal("no mem for sys.argv");
return av;
}
/* sys.exit method */
static object *
sys_exit(self, args)
object *self;
object *args;
{
int sts;
if (!getintarg(args, &sts))
return NULL;
goaway(sts);
exit(sts); /* Just in case */
/* NOTREACHED */
}
static object *sysin, *sysout, *syserr;
void
initsys(argc, argv)
int argc;
char **argv;
{
object *v;
object *exit;
if ((sysdict = newdictobject()) == NULL)
fatal("can't create sys dict");
/* NB keep an extra ref to the std files to avoid closing them
when the user deletes them */
sysin = newopenfileobject(stdin, "<stdin>", "r");
sysout = newopenfileobject(stdout, "<stdout>", "w");
syserr = newopenfileobject(stderr, "<stderr>", "w");
v = makeargv(argc, argv);
exit = newmethodobject("exit", sys_exit, (object *)NULL);
if (err_occurred())
fatal("can't create sys.* objects");
dictinsert(sysdict, "stdin", sysin);
dictinsert(sysdict, "stdout", sysout);
dictinsert(sysdict, "stderr", syserr);
dictinsert(sysdict, "argv", v);
dictinsert(sysdict, "exit", exit);
if (err_occurred())
fatal("can't insert sys.* objects in sys dict");
DECREF(exit);
DECREF(v);
/* The other symbols are added elsewhere */
/* Only now can we initialize the import stuff, after which
we can turn ourselves into a module */
initimport();
if ((v = new_module("sys")) == NULL)
fatal("can't create sys module");
if (setmoduledict(v, sysdict) != 0)
fatal("can't assign sys dict to sys module");
DECREF(v);
}
static void
cleardict(d)
object *d;
{
int i;
for (i = getdictsize(d); --i >= 0; ) {
char *k;
k = getdictkey(d, i);
if (k != NULL) {
(void) dictremove(d, k);
}
}
}
void
closesys()
{
object *modules;
modules = sysget("modules");
if (modules != NULL && is_dictobject(modules)) {
int i;
/* Explicitly erase all modules; this is the safest way
to get rid of at least *some* circular dependencies */
INCREF(modules);
for (i = getdictsize(modules); --i >= 0; ) {
char *k;
k = getdictkey(modules, i);
if (k != NULL) {
object *m;
m = dictlookup(modules, k);
if (m != NULL && is_moduleobject(m)) {
object *d;
d = getmoduledict(m);
if (d != NULL && is_dictobject(d)) {
cleardict(d);
}
}
}
}
cleardict(modules);
DECREF(modules);
}
DECREF(sysdict);
}
|
