Python/sysmodule.c - platform/external/python/cpython2 - Gitiles

 /***********************************************************
 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
 The Netherlands.

                         All Rights Reserved

 Permission to use, copy, modify, and distribute this software and its
 documentation for any purpose and without fee is hereby granted,
 provided that the above copyright notice appear in all copies and that
 both that copyright notice and this permission notice appear in
 supporting documentation, and that the names of Stichting Mathematisch
 Centrum or CWI not be used in advertising or publicity pertaining to
 distribution of the software without specific, written prior permission.

 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 ******************************************************************/

 /* System module */

 /*
 Various bits of information used by the interpreter are collected in
 module 'sys'.
 Function member:
 - exit(sts): raise SystemExit
 Data members:
 - stdin, stdout, stderr: standard file objects
 - modules: the table of modules (dictionary)
 - path: module search path (list of strings)
 - argv: script arguments (list of strings)
 - ps1, ps2: optional primary and secondary prompts (strings)
 */

 #include "allobjects.h"

 #include "sysmodule.h"
 #include "import.h"
 #include "modsupport.h"
 #include "osdefs.h"

 object *sys_trace, *sys_profile;
 int sys_checkinterval = 10;

 static object *sysdict;

 #ifdef MS_COREDLL
 extern void *PyWin_DLLhModule;
 #endif

 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 && is_fileobject(v))
 		fp = getfilefile(v);
 	if (fp == NULL)
 		fp = def;
 	return fp;
 }

 int
 sysset(name, v)
 	char *name;
 	object *v;
 {
 	if (v == NULL) {
 		if (dictlookup(sysdict, name) == NULL)
 			return 0;
 		else
 			return dictremove(sysdict, name);
 	}
 	else
 		return dictinsert(sysdict, name, v);
 }

 static object *
 sys_exit(self, args)
 	object *self;
 	object *args;
 {
 	/* Raise SystemExit so callers may catch it or clean up. */
 	err_setval(SystemExit, args);
 	return NULL;
 }

 static object *
 sys_settrace(self, args)
 	object *self;
 	object *args;
 {
 	if (args == None)
 		args = NULL;
 	else
 		XINCREF(args);
 	XDECREF(sys_trace);
 	sys_trace = args;
 	INCREF(None);
 	return None;
 }

 static object *
 sys_setprofile(self, args)
 	object *self;
 	object *args;
 {
 	if (args == None)
 		args = NULL;
 	else
 		XINCREF(args);
 	XDECREF(sys_profile);
 	sys_profile = args;
 	INCREF(None);
 	return None;
 }

 static object *
 sys_setcheckinterval(self, args)
 	object *self;
 	object *args;
 {
 	if (!newgetargs(args, "i", &sys_checkinterval))
 		return NULL;
 	INCREF(None);
 	return None;
 }

 #ifdef USE_MALLOPT
 /* Link with -lmalloc (or -lmpc) on an SGI */
 #include <malloc.h>

 static object *
 sys_mdebug(self, args)
 	object *self;
 	object *args;
 {
 	int flag;
 	if (!getargs(args, "i", &flag))
 		return NULL;
 	mallopt(M_DEBUG, flag);
 	INCREF(None);
 	return None;
 }
 #endif /* USE_MALLOPT */

 static object *
 sys_getrefcount(self, args)
 	object *self;
 	object *args;
 {
 	object *arg;
 	if (!getargs(args, "O", &arg))
 		return NULL;
 	return newintobject((long) arg->ob_refcnt);
 }

 #ifdef COUNT_ALLOCS
 static PyObject *
 sys_getcounts(self, args)
 	PyObject *self, *args;
 {
 	extern PyObject *get_counts Py_PROTO((void));

 	if (!PyArg_Parse(args, ""))
 		return NULL;
 	return get_counts();
 }
 #endif

 #ifdef Py_TRACE_REFS
 /* Defined in objects.c because it uses static globals if that file */
 extern PyObject *_Py_GetObjects Py_PROTO((PyObject *, PyObject *));
 #endif

 static struct methodlist sys_methods[] = {
 	{"exit",	sys_exit, 0},
 	{"getrefcount",	sys_getrefcount, 0},
 #ifdef COUNT_ALLOCS
 	{"getcounts",	sys_getcounts, 0},
 #endif
 #ifdef Py_TRACE_REFS
 	{"getobjects",	_Py_GetObjects, 1},
 #endif
 #ifdef USE_MALLOPT
 	{"mdebug",	sys_mdebug, 0},
 #endif
 	{"setprofile",	sys_setprofile, 0},
 	{"settrace",	sys_settrace, 0},
 	{"setcheckinterval",	sys_setcheckinterval, 1},
 	{NULL,		NULL}		/* sentinel */
 };

 static object *sysin, *sysout, *syserr;

 static object *
 list_builtin_module_names()
 {
 	object *list = newlistobject(0);
 	int i;
 	if (list == NULL)
 		return NULL;
 	for (i = 0; inittab[i].name != NULL; i++) {
 		object *name = newstringobject(inittab[i].name);
 		if (name == NULL)
 			break;
 		addlistitem(list, name);
 		DECREF(name);
 	}
 	if (sortlist(list) != 0) {
 		DECREF(list);
 		list = NULL;
 	}
 	return list;
 }

 void
 initsys()
 {
 	extern long getmaxint PROTO((void));
 	extern char *getversion PROTO((void));
 	extern char *getcopyright PROTO((void));
 	extern char *getplatform PROTO((void));
 	extern char *Py_GetPrefix PROTO((void));
 	extern char *Py_GetExecPrefix PROTO((void));
 	extern int fclose PROTO((FILE *));
 	object *m = initmodule("sys", sys_methods);
 	object *v;
 	sysdict = getmoduledict(m);
 	INCREF(sysdict);
 	/* NB keep an extra ref to the std files to avoid closing them
 	   when the user deletes them */
 	sysin = newopenfileobject(stdin, "<stdin>", "r", fclose);
 	sysout = newopenfileobject(stdout, "<stdout>", "w", fclose);
 	syserr = newopenfileobject(stderr, "<stderr>", "w", fclose);
 	if (err_occurred())
 		fatal("can't initialize sys.std{in,out,err}");
 	dictinsert(sysdict, "stdin", sysin);
 	dictinsert(sysdict, "stdout", sysout);
 	dictinsert(sysdict, "stderr", syserr);
 	dictinsert(sysdict, "version", v = newstringobject(getversion()));
 	XDECREF(v);
 	dictinsert(sysdict, "copyright", v = newstringobject(getcopyright()));
 	XDECREF(v);
 	dictinsert(sysdict, "platform", v = newstringobject(getplatform()));
 	XDECREF(v);
 	dictinsert(sysdict, "prefix", v = newstringobject(Py_GetPrefix()));
 	XDECREF(v);
 	dictinsert(sysdict, "exec_prefix",
 		   v = newstringobject(Py_GetExecPrefix()));
 	XDECREF(v);
 	dictinsert(sysdict, "maxint", v = newintobject(getmaxint()));
 	XDECREF(v);
 	dictinsert(sysdict, "modules", get_modules());
 	dictinsert(sysdict, "builtin_module_names",
 		   v = list_builtin_module_names());
 	XDECREF(v);
 #ifdef MS_COREDLL
 	dictinsert(sysdict, "dllhandle", v = newintobject((int)PyWin_DLLhModule));
 	XDECREF(v);
 	dictinsert(sysdict, "winver", v = newstringobject(MS_DLL_ID));
 	XDECREF(v);
 #endif
 	if (err_occurred())
 		fatal("can't insert sys.* objects in sys dict");
 }

 static object *
 makepathobject(path, delim)
 	char *path;
 	int delim;
 {
 	int i, n;
 	char *p;
 	object *v, *w;

 	n = 1;
 	p = path;
 	while ((p = strchr(p, delim)) != NULL) {
 		n++;
 		p++;
 	}
 	v = newlistobject(n);
 	if (v == NULL)
 		return NULL;
 	for (i = 0; ; i++) {
 		p = strchr(path, delim);
 		if (p == NULL)
 			p = strchr(path, '\0'); /* End of string */
 		w = newsizedstringobject(path, (int) (p - path));
 		if (w == NULL) {
 			DECREF(v);
 			return NULL;
 		}
 		setlistitem(v, i, w);
 		if (*p == '\0')
 			break;
 		path = p+1;
 	}
 	return v;
 }

 void
 setpythonpath(path)
 	char *path;
 {
 	object *v;
 	if ((v = makepathobject(path, DELIM)) == NULL)
 		fatal("can't create sys.path");
 	if (sysset("path", v) != 0)
 		fatal("can't assign sys.path");
 	DECREF(v);
 }

 static object *
 makeargvobject(argc, argv)
 	int argc;
 	char **argv;
 {
 	object *av;
 	if (argc <= 0 || argv == NULL) {
 		/* Ensure at least one (empty) argument is seen */
 		static char *empty_argv[1] = {""};
 		argv = empty_argv;
 		argc = 1;
 	}
 	av = newlistobject(argc);
 	if (av != NULL) {
 		int i;
 		for (i = 0; i < argc; i++) {
 			object *v = newstringobject(argv[i]);
 			if (v == NULL) {
 				DECREF(av);
 				av = NULL;
 				break;
 			}
 			setlistitem(av, i, v);
 		}
 	}
 	return av;
 }

 void
 setpythonargv(argc, argv)
 	int argc;
 	char **argv;
 {
 	object *av = makeargvobject(argc, argv);
 	object *path = sysget("path");
 	if (av == NULL)
 		fatal("no mem for sys.argv");
 	if (sysset("argv", av) != 0)
 		fatal("can't assign sys.argv");
 	if (path != NULL) {
 		char *p = NULL;
 		int n = 0;
 		object *a;
 #if SEP == '\\' /* Special case for MS filename syntax */
 		if (argc > 0 && argv[0] != NULL) {
 			char *q;
 			p = strrchr(argv[0], SEP);
 			/* Test for alternate separator */
 			q = strrchr(p ? p : argv[0], '/');
 			if (q != NULL)
 				p = q;
 			if (p != NULL) {
 				n = p + 1 - argv[0];
 				if (n > 1 && p[-1] != ':')
 					n--; /* Drop trailing separator */
 			}
 		}
 #else /* All other filename syntaxes */
 		if (argc > 0 && argv[0] != NULL)
 			p = strrchr(argv[0], SEP);
 		if (p != NULL) {
 			n = p + 1 - argv[0];
 #if SEP == '/' /* Special case for Unix filename syntax */
 			if (n > 1)
 				n--; /* Drop trailing separator */
 #endif /* Unix */
 		}
 #endif /* All others */
 		a = newsizedstringobject(argv[0], n);
 		if (a == NULL)
 			fatal("no mem for sys.path insertion");
 		if (inslistitem(path, 0, a) < 0)
 			fatal("sys.path.insert(0) failed");
 		DECREF(a);
 	}
 	DECREF(av);
 }
	/***********************************************************
	Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
	The Netherlands.

	All Rights Reserved

	Permission to use, copy, modify, and distribute this software and its
	documentation for any purpose and without fee is hereby granted,
	provided that the above copyright notice appear in all copies and that
	both that copyright notice and this permission notice appear in
	supporting documentation, and that the names of Stichting Mathematisch
	Centrum or CWI not be used in advertising or publicity pertaining to
	distribution of the software without specific, written prior permission.

	STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
	THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
	FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
	FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

	******************************************************************/

	/* System module */

	/*
	Various bits of information used by the interpreter are collected in
	module 'sys'.
	Function member:
	- exit(sts): raise SystemExit
	Data members:
	- stdin, stdout, stderr: standard file objects
	- modules: the table of modules (dictionary)
	- path: module search path (list of strings)
	- argv: script arguments (list of strings)
	- ps1, ps2: optional primary and secondary prompts (strings)
	*/

	#include "allobjects.h"

	#include "sysmodule.h"
	#include "import.h"
	#include "modsupport.h"
	#include "osdefs.h"

	object sys_trace, sys_profile;
	int sys_checkinterval = 10;

	static object *sysdict;

	#ifdef MS_COREDLL
	extern void *PyWin_DLLhModule;
	#endif

	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 && is_fileobject(v))
	fp = getfilefile(v);
	if (fp == NULL)
	fp = def;
	return fp;
	}

	int
	sysset(name, v)
	char *name;
	object *v;
	{
	if (v == NULL) {
	if (dictlookup(sysdict, name) == NULL)
	return 0;
	else
	return dictremove(sysdict, name);
	}
	else
	return dictinsert(sysdict, name, v);
	}

	static object *
	sys_exit(self, args)
	object *self;
	object *args;
	{
	/* Raise SystemExit so callers may catch it or clean up. */
	err_setval(SystemExit, args);
	return NULL;
	}

	static object *
	sys_settrace(self, args)
	object *self;
	object *args;
	{
	if (args == None)
	args = NULL;
	else
	XINCREF(args);
	XDECREF(sys_trace);
	sys_trace = args;
	INCREF(None);
	return None;
	}

	static object *
	sys_setprofile(self, args)
	object *self;
	object *args;
	{
	if (args == None)
	args = NULL;
	else
	XINCREF(args);
	XDECREF(sys_profile);
	sys_profile = args;
	INCREF(None);
	return None;
	}

	static object *
	sys_setcheckinterval(self, args)
	object *self;
	object *args;
	{
	if (!newgetargs(args, "i", &sys_checkinterval))
	return NULL;
	INCREF(None);
	return None;
	}

	#ifdef USE_MALLOPT
	/* Link with -lmalloc (or -lmpc) on an SGI */
	#include <malloc.h>

	static object *
	sys_mdebug(self, args)
	object *self;
	object *args;
	{
	int flag;
	if (!getargs(args, "i", &flag))
	return NULL;
	mallopt(M_DEBUG, flag);
	INCREF(None);
	return None;
	}
	#endif /* USE_MALLOPT */

	static object *
	sys_getrefcount(self, args)
	object *self;
	object *args;
	{
	object *arg;
	if (!getargs(args, "O", &arg))
	return NULL;
	return newintobject((long) arg->ob_refcnt);
	}

	#ifdef COUNT_ALLOCS
	static PyObject *
	sys_getcounts(self, args)
	PyObject self, args;
	{
	extern PyObject *get_counts Py_PROTO((void));

	if (!PyArg_Parse(args, ""))
	return NULL;
	return get_counts();
	}
	#endif

	#ifdef Py_TRACE_REFS
	/* Defined in objects.c because it uses static globals if that file */
	extern PyObject _Py_GetObjects Py_PROTO((PyObject , PyObject *));
	#endif

	static struct methodlist sys_methods[] = {
	{"exit", sys_exit, 0},
	{"getrefcount", sys_getrefcount, 0},
	#ifdef COUNT_ALLOCS
	{"getcounts", sys_getcounts, 0},
	#endif
	#ifdef Py_TRACE_REFS
	{"getobjects", _Py_GetObjects, 1},
	#endif
	#ifdef USE_MALLOPT
	{"mdebug", sys_mdebug, 0},
	#endif
	{"setprofile", sys_setprofile, 0},
	{"settrace", sys_settrace, 0},
	{"setcheckinterval", sys_setcheckinterval, 1},
	{NULL, NULL} /* sentinel */
	};

	static object sysin, sysout, *syserr;

	static object *
	list_builtin_module_names()
	{
	object *list = newlistobject(0);
	int i;
	if (list == NULL)
	return NULL;
	for (i = 0; inittab[i].name != NULL; i++) {
	object *name = newstringobject(inittab[i].name);
	if (name == NULL)
	break;
	addlistitem(list, name);
	DECREF(name);
	}
	if (sortlist(list) != 0) {
	DECREF(list);
	list = NULL;
	}
	return list;
	}

	void
	initsys()
	{
	extern long getmaxint PROTO((void));
	extern char *getversion PROTO((void));
	extern char *getcopyright PROTO((void));
	extern char *getplatform PROTO((void));
	extern char *Py_GetPrefix PROTO((void));
	extern char *Py_GetExecPrefix PROTO((void));
	extern int fclose PROTO((FILE *));
	object *m = initmodule("sys", sys_methods);
	object *v;
	sysdict = getmoduledict(m);
	INCREF(sysdict);
	/* NB keep an extra ref to the std files to avoid closing them
	when the user deletes them */
	sysin = newopenfileobject(stdin, "<stdin>", "r", fclose);
	sysout = newopenfileobject(stdout, "<stdout>", "w", fclose);
	syserr = newopenfileobject(stderr, "<stderr>", "w", fclose);
	if (err_occurred())
	fatal("can't initialize sys.std{in,out,err}");
	dictinsert(sysdict, "stdin", sysin);
	dictinsert(sysdict, "stdout", sysout);
	dictinsert(sysdict, "stderr", syserr);
	dictinsert(sysdict, "version", v = newstringobject(getversion()));
	XDECREF(v);
	dictinsert(sysdict, "copyright", v = newstringobject(getcopyright()));
	XDECREF(v);
	dictinsert(sysdict, "platform", v = newstringobject(getplatform()));
	XDECREF(v);
	dictinsert(sysdict, "prefix", v = newstringobject(Py_GetPrefix()));
	XDECREF(v);
	dictinsert(sysdict, "exec_prefix",
	v = newstringobject(Py_GetExecPrefix()));
	XDECREF(v);
	dictinsert(sysdict, "maxint", v = newintobject(getmaxint()));
	XDECREF(v);
	dictinsert(sysdict, "modules", get_modules());
	dictinsert(sysdict, "builtin_module_names",
	v = list_builtin_module_names());
	XDECREF(v);
	#ifdef MS_COREDLL
	dictinsert(sysdict, "dllhandle", v = newintobject((int)PyWin_DLLhModule));
	XDECREF(v);
	dictinsert(sysdict, "winver", v = newstringobject(MS_DLL_ID));
	XDECREF(v);
	#endif
	if (err_occurred())
	fatal("can't insert sys.* objects in sys dict");
	}

	static object *
	makepathobject(path, delim)
	char *path;
	int delim;
	{
	int i, n;
	char *p;
	object v, w;

	n = 1;
	p = path;
	while ((p = strchr(p, delim)) != NULL) {
	n++;
	p++;
	}
	v = newlistobject(n);
	if (v == NULL)
	return NULL;
	for (i = 0; ; i++) {
	p = strchr(path, delim);
	if (p == NULL)
	p = strchr(path, '\0'); /* End of string */
	w = newsizedstringobject(path, (int) (p - path));
	if (w == NULL) {
	DECREF(v);
	return NULL;
	}
	setlistitem(v, i, w);
	if (*p == '\0')
	break;
	path = p+1;
	}
	return v;
	}

	void
	setpythonpath(path)
	char *path;
	{
	object *v;
	if ((v = makepathobject(path, DELIM)) == NULL)
	fatal("can't create sys.path");
	if (sysset("path", v) != 0)
	fatal("can't assign sys.path");
	DECREF(v);
	}

	static object *
	makeargvobject(argc, argv)
	int argc;
	char **argv;
	{
	object *av;
	if (argc <= 0 \|\| argv == NULL) {
	/* Ensure at least one (empty) argument is seen */
	static char *empty_argv[1] = {""};
	argv = empty_argv;
	argc = 1;
	}
	av = newlistobject(argc);
	if (av != NULL) {
	int i;
	for (i = 0; i < argc; i++) {
	object *v = newstringobject(argv[i]);
	if (v == NULL) {
	DECREF(av);
	av = NULL;
	break;
	}
	setlistitem(av, i, v);
	}
	}
	return av;
	}

	void
	setpythonargv(argc, argv)
	int argc;
	char **argv;
	{
	object *av = makeargvobject(argc, argv);
	object *path = sysget("path");
	if (av == NULL)
	fatal("no mem for sys.argv");
	if (sysset("argv", av) != 0)
	fatal("can't assign sys.argv");
	if (path != NULL) {
	char *p = NULL;
	int n = 0;
	object *a;
	#if SEP == '\\' /* Special case for MS filename syntax */
	if (argc > 0 && argv[0] != NULL) {
	char *q;
	p = strrchr(argv[0], SEP);
	/* Test for alternate separator */
	q = strrchr(p ? p : argv[0], '/');
	if (q != NULL)
	p = q;
	if (p != NULL) {
	n = p + 1 - argv[0];
	if (n > 1 && p[-1] != ':')
	n--; /* Drop trailing separator */
	}
	}
	#else /* All other filename syntaxes */
	if (argc > 0 && argv[0] != NULL)
	p = strrchr(argv[0], SEP);
	if (p != NULL) {
	n = p + 1 - argv[0];
	#if SEP == '/' /* Special case for Unix filename syntax */
	if (n > 1)
	n--; /* Drop trailing separator */
	#endif /* Unix */
	}
	#endif /* All others */
	a = newsizedstringobject(argv[0], n);
	if (a == NULL)
	fatal("no mem for sys.path insertion");
	if (inslistitem(path, 0, a) < 0)
	fatal("sys.path.insert(0) failed");
	DECREF(a);
	}
	DECREF(av);
	}