sysmodule.c revision a0d7a233981ce56c74d3fd6a4fb0cadac08a7654 
1/***********************************************************
2Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
3The Netherlands.
4
5                        All Rights Reserved
6
7Permission to use, copy, modify, and distribute this software and its
8documentation for any purpose and without fee is hereby granted,
9provided that the above copyright notice appear in all copies and that
10both that copyright notice and this permission notice appear in
11supporting documentation, and that the names of Stichting Mathematisch
12Centrum or CWI not be used in advertising or publicity pertaining to
13distribution of the software without specific, written prior permission.
14
15STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
16THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
17FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
18FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
21OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23******************************************************************/
24
25/* System module */
26
27/*
28Various bits of information used by the interpreter are collected in
29module 'sys'.
30Function member:
31- exit(sts): call (C, POSIX) exit(sts)
32Data members:
33- stdin, stdout, stderr: standard file objects
34- modules: the table of modules (dictionary)
35- path: module search path (list of strings)
36- argv: script arguments (list of strings)
37- ps1, ps2: optional primary and secondary prompts (strings)
38*/
39
40#include "allobjects.h"
41
42#include "sysmodule.h"
43#include "import.h"
44#include "modsupport.h"
45#include "osdefs.h"
46
47object *sys_trace, *sys_profile;
48int sys_checkinterval;
49
50static object *sysdict;
51
52object *
53sysget(name)
54	char *name;
55{
56	return dictlookup(sysdict, name);
57}
58
59FILE *
60sysgetfile(name, def)
61	char *name;
62	FILE *def;
63{
64	FILE *fp = NULL;
65	object *v = sysget(name);
66	if (v != NULL && is_fileobject(v))
67		fp = getfilefile(v);
68	if (fp == NULL)
69		fp = def;
70	return fp;
71}
72
73int
74sysset(name, v)
75	char *name;
76	object *v;
77{
78	if (v == NULL) {
79		if (dictlookup(sysdict, name) == NULL)
80			return 0;
81		else
82			return dictremove(sysdict, name);
83	}
84	else
85		return dictinsert(sysdict, name, v);
86}
87
88static object *
89sys_exit(self, args)
90	object *self;
91	object *args;
92{
93	/* Raise SystemExit so callers may catch it or clean up. */
94	err_setval(SystemExit, args);
95	return NULL;
96}
97
98static object *
99sys_settrace(self, args)
100	object *self;
101	object *args;
102{
103	if (args == None)
104		args = NULL;
105	else
106		XINCREF(args);
107	XDECREF(sys_trace);
108	sys_trace = args;
109	INCREF(None);
110	return None;
111}
112
113static object *
114sys_setprofile(self, args)
115	object *self;
116	object *args;
117{
118	if (args == None)
119		args = NULL;
120	else
121		XINCREF(args);
122	XDECREF(sys_profile);
123	sys_profile = args;
124	INCREF(None);
125	return None;
126}
127
128static object *
129sys_setcheckinterval(self, args)
130	object *self;
131	object *args;
132{
133	if (!newgetargs(args, "i", &sys_checkinterval))
134		return NULL;
135	INCREF(None);
136	return None;
137}
138
139#ifdef USE_MALLOPT
140/* Link with -lmalloc (or -lmpc) on an SGI */
141#include <malloc.h>
142
143static object *
144sys_mdebug(self, args)
145	object *self;
146	object *args;
147{
148	int flag;
149	if (!getargs(args, "i", &flag))
150		return NULL;
151	mallopt(M_DEBUG, flag);
152	INCREF(None);
153	return None;
154}
155#endif /* USE_MALLOPT */
156
157static struct methodlist sys_methods[] = {
158	{"exit",	sys_exit},
159#ifdef USE_MALLOPT
160	{"mdebug",	sys_mdebug},
161#endif
162	{"setprofile",	sys_setprofile},
163	{"settrace",	sys_settrace},
164	{"setcheckinterval",	sys_setcheckinterval},
165	{NULL,		NULL}		/* sentinel */
166};
167
168static object *sysin, *sysout, *syserr;
169
170static object *
171list_builtin_module_names()
172{
173	object *list = newlistobject(0);
174	int i;
175	if (list == NULL)
176		return NULL;
177	for (i = 0; inittab[i].name != NULL; i++) {
178		object *name = newstringobject(inittab[i].name);
179		if (name == NULL)
180			break;
181		addlistitem(list, name);
182		DECREF(name);
183	}
184	if (sortlist(list) != 0) {
185		DECREF(list);
186		list = NULL;
187	}
188	return list;
189}
190
191void
192initsys()
193{
194	extern long getmaxint PROTO((void));
195	extern char *getversion PROTO((void));
196	extern char *getcopyright PROTO((void));
197	extern int fclose PROTO((FILE *));
198	object *m = initmodule("sys", sys_methods);
199	object *v;
200	sysdict = getmoduledict(m);
201	INCREF(sysdict);
202	/* NB keep an extra ref to the std files to avoid closing them
203	   when the user deletes them */
204	sysin = newopenfileobject(stdin, "<stdin>", "r", fclose);
205	sysout = newopenfileobject(stdout, "<stdout>", "w", fclose);
206	syserr = newopenfileobject(stderr, "<stderr>", "w", fclose);
207	if (err_occurred())
208		fatal("can't initialize sys.std{in,out,err}");
209	dictinsert(sysdict, "stdin", sysin);
210	dictinsert(sysdict, "stdout", sysout);
211	dictinsert(sysdict, "stderr", syserr);
212	dictinsert(sysdict, "version", v = newstringobject(getversion()));
213	XDECREF(v);
214	dictinsert(sysdict, "copyright", v = newstringobject(getcopyright()));
215	XDECREF(v);
216	dictinsert(sysdict, "maxint", v = newintobject(getmaxint()));
217	XDECREF(v);
218	dictinsert(sysdict, "modules", get_modules());
219	dictinsert(sysdict, "builtin_module_names",
220		   v = list_builtin_module_names());
221	XDECREF(v);
222	if (err_occurred())
223		fatal("can't insert sys.* objects in sys dict");
224}
225
226static object *
227makepathobject(path, delim)
228	char *path;
229	int delim;
230{
231	int i, n;
232	char *p;
233	object *v, *w;
234
235	n = 1;
236	p = path;
237	while ((p = strchr(p, delim)) != NULL) {
238		n++;
239		p++;
240	}
241	v = newlistobject(n);
242	if (v == NULL)
243		return NULL;
244	for (i = 0; ; i++) {
245		p = strchr(path, delim);
246		if (p == NULL)
247			p = strchr(path, '\0'); /* End of string */
248		w = newsizedstringobject(path, (int) (p - path));
249		if (w == NULL) {
250			DECREF(v);
251			return NULL;
252		}
253		setlistitem(v, i, w);
254		if (*p == '\0')
255			break;
256		path = p+1;
257	}
258	return v;
259}
260
261void
262setpythonpath(path)
263	char *path;
264{
265	object *v;
266	if ((v = makepathobject(path, DELIM)) == NULL)
267		fatal("can't create sys.path");
268	if (sysset("path", v) != 0)
269		fatal("can't assign sys.path");
270	DECREF(v);
271}
272
273static object *
274makeargvobject(argc, argv)
275	int argc;
276	char **argv;
277{
278	object *av;
279	if (argc <= 0 || argv == NULL) {
280		/* Ensure at least one (empty) argument is seen */
281		static char *empty_argv[1] = {""};
282		argv = empty_argv;
283		argc = 1;
284	}
285	av = newlistobject(argc);
286	if (av != NULL) {
287		int i;
288		for (i = 0; i < argc; i++) {
289			object *v = newstringobject(argv[i]);
290			if (v == NULL) {
291				DECREF(av);
292				av = NULL;
293				break;
294			}
295			setlistitem(av, i, v);
296		}
297	}
298	return av;
299}
300
301void
302setpythonargv(argc, argv)
303	int argc;
304	char **argv;
305{
306	object *av = makeargvobject(argc, argv);
307	if (av == NULL)
308		fatal("no mem for sys.argv");
309	if (sysset("argv", av) != 0)
310		fatal("can't assign sys.argv");
311	DECREF(av);
312}
313