/* Python interpreter main program */

#include "Python.h"

#include "osdefs.h"

#include "code.h" /* For CO_FUTURE_DIVISION */

#include "import.h"

#ifdef __VMS

#include <unixlib.h>

#endif

#if defined(MS_WINDOWS) || defined(__CYGWIN__)

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif

#endif

#if (defined(PYOS_OS2) && !defined(PYCC_GCC)) || defined(MS_WINDOWS)

#define PYTHONHOMEHELP "<prefix>\\lib"

#else

#if defined(PYOS_OS2) && defined(PYCC_GCC)

#define PYTHONHOMEHELP "<prefix>/Lib"

#else

#define PYTHONHOMEHELP "<prefix>/pythonX.X"

#endif

#endif

#include "pygetopt.h"

#define COPYRIGHT \

    "Type \"help\", \"copyright\", \"credits\" or \"license\" " \

    "for more information."

#ifdef __cplusplus

extern "C" {

#endif

/* For Py_GetArgcArgv(); set by main() */

static char **orig_argv;

static int  orig_argc;

/* command line options */

#define BASE_OPTS "3bBc:dEhiJm:OQ:sStuUvVW:xX?"

#ifndef RISCOS

#define PROGRAM_OPTS BASE_OPTS

#else /*RISCOS*/

/* extra option saying that we are running under a special task window

   frontend; especially my_readline will behave different */

#define PROGRAM_OPTS BASE_OPTS "w"

/* corresponding flag */

extern int Py_RISCOSWimpFlag;

#endif /*RISCOS*/

/* Short usage message (with %s for argv0) */

static char *usage_line =

"usage: %s [option] ... [-c cmd | -m mod | file | -] [arg] ...\n";

/* Long usage message, split into parts < 512 bytes */

static char *usage_1 = "\

Options and arguments (and corresponding environment variables):\n\

-B     : don't write .py[co] files on import; also PYTHONDONTWRITEBYTECODE=x\n\

-c cmd : program passed in as string (terminates option list)\n\

-d     : debug output from parser; also PYTHONDEBUG=x\n\

-E     : ignore PYTHON* environment variables (such as PYTHONPATH)\n\

-h     : print this help message and exit (also --help)\n\

-i     : inspect interactively after running script; forces a prompt even\n\

";

static char *usage_2 = "\

         if stdin does not appear to be a terminal; also PYTHONINSPECT=x\n\

-m mod : run library module as a script (terminates option list)\n\

-O     : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x\n\

-OO    : remove doc-strings in addition to the -O optimizations\n\

-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew\n\

-s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE\n\

-S     : don't imply 'import site' on initialization\n\

-t     : issue warnings about inconsistent tab usage (-tt: issue errors)\n\

";

static char *usage_3 = "\

-u     : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x\n\

         see man page for details on internal buffering relating to '-u'\n\

-v     : verbose (trace import statements); also PYTHONVERBOSE=x\n\

         can be supplied multiple times to increase verbosity\n\

-V     : print the Python version number and exit (also --version)\n\

-W arg : warning control; arg is action:message:category:module:lineno\n\

-x     : skip first line of source, allowing use of non-Unix forms of #!cmd\n\

";

static char *usage_4 = "\

-3     : warn about Python 3.x incompatibilities\n\

file   : program read from script file\n\

-      : program read from stdin (default; interactive mode if a tty)\n\

arg ...: arguments passed to program in sys.argv[1:]\n\n\

Other environment variables:\n\

PYTHONSTARTUP: file executed on interactive startup (no default)\n\

PYTHONPATH   : '%c'-separated list of directories prefixed to the\n\

               default module search path.  The result is sys.path.\n\

";

static char *usage_5 = "\

PYTHONHOME   : alternate <prefix> directory (or <prefix>%c<exec_prefix>).\n\

               The default module search path uses %s.\n\

PYTHONCASEOK : ignore case in 'import' statements (Windows).\n\

PYTHONIOENCODING: Encoding[:errors] used for stdin/stdout/stderr.\n\

";

static int

usage(int exitcode, char* program)

{

	FILE *f = exitcode ? stderr : stdout;

	fprintf(f, usage_line, program);

	if (exitcode)

		fprintf(f, "Try `python -h' for more information.\n");

	else {

		fprintf(f, usage_1);

		fprintf(f, usage_2);

		fprintf(f, usage_3);

		fprintf(f, usage_4, DELIM);

		fprintf(f, usage_5, DELIM, PYTHONHOMEHELP);

	}

#if defined(__VMS)

	if (exitcode == 0) {

		/* suppress 'error' message */

		return 1;

	}

	else {

		/* STS$M_INHIB_MSG + SS$_ABORT */

		return 0x1000002c;

	}

#else

	return exitcode;

#endif

	/*NOTREACHED*/

}

static void RunStartupFile(PyCompilerFlags *cf)

{

	char *startup = Py_GETENV("PYTHONSTARTUP");

	if (startup != NULL && startup[0] != '\0') {

		FILE *fp = fopen(startup, "r");

		if (fp != NULL) {

			(void) PyRun_SimpleFileExFlags(fp, startup, 0, cf);

			PyErr_Clear();

			fclose(fp);

               } else {

			int save_errno;

			save_errno = errno;

			PySys_WriteStderr("Could not open PYTHONSTARTUP\n");

			errno = save_errno;

			PyErr_SetFromErrnoWithFilename(PyExc_IOError,

						       startup);

			PyErr_Print();

			PyErr_Clear();

		}

	}

}

static int RunModule(char *module, int set_argv0)

{

	PyObject *runpy, *runmodule, *runargs, *result;

	runpy = PyImport_ImportModule("runpy");

	if (runpy == NULL) {

		fprintf(stderr, "Could not import runpy module\n");

		return -1;

	}

	runmodule = PyObject_GetAttrString(runpy, "_run_module_as_main");

	if (runmodule == NULL) {

		fprintf(stderr, "Could not access runpy._run_module_as_main\n");

		Py_DECREF(runpy);

		return -1;

	}

	runargs = Py_BuildValue("(si)", module, set_argv0);

	if (runargs == NULL) {

		fprintf(stderr,

			"Could not create arguments for runpy._run_module_as_main\n");

		Py_DECREF(runpy);

		Py_DECREF(runmodule);

		return -1;

	}

	result = PyObject_Call(runmodule, runargs, NULL);

	if (result == NULL) {

		PyErr_Print();

	}

	Py_DECREF(runpy);

	Py_DECREF(runmodule);

	Py_DECREF(runargs);

	if (result == NULL) {

		return -1;

	}

	Py_DECREF(result);

	return 0;

}

static int RunMainFromImporter(char *filename)

{

	PyObject *argv0 = NULL, *importer = NULL;

	if ((argv0 = PyString_FromString(filename)) && 

	    (importer = PyImport_GetImporter(argv0)) &&

	    (importer->ob_type != &PyNullImporter_Type))

	{

		 /* argv0 is usable as an import source, so

			put it in sys.path[0] and import __main__ */

		PyObject *sys_path = NULL;

		if ((sys_path = PySys_GetObject("path")) &&

		    !PyList_SetItem(sys_path, 0, argv0))

		{

			Py_INCREF(argv0);

			Py_DECREF(importer);

			sys_path = NULL;

			return RunModule("__main__", 0) != 0;

		}

	}

	Py_XDECREF(argv0);

	Py_XDECREF(importer);

	if (PyErr_Occurred()) {

		PyErr_Print();

		return 1;

	}

	return -1;

}

/* Wait until threading._shutdown completes, provided

   the threading module was imported in the first place.

   The shutdown routine will wait until all non-daemon

   "threading" threads have completed. */

#include "abstract.h"

static void

WaitForThreadShutdown(void)

{

#ifdef WITH_THREAD

	PyObject *result;

	PyThreadState *tstate = PyThreadState_GET();

	PyObject *threading = PyMapping_GetItemString(tstate->interp->modules,

						      "threading");

	if (threading == NULL) {

		/* threading not imported */

		PyErr_Clear();

		return;

	}

	result = PyObject_CallMethod(threading, "_shutdown", "");

	if (result == NULL)

		PyErr_WriteUnraisable(threading);

	else

		Py_DECREF(result);

	Py_DECREF(threading);

#endif

}

/* Main program */

int

Py_Main(int argc, char **argv)

{

	int c;

	int sts;

	char *command = NULL;

	char *filename = NULL;

	char *module = NULL;

	FILE *fp = stdin;

	char *p;

	int unbuffered = 0;

	int skipfirstline = 0;

	int stdin_is_interactive = 0;

	int help = 0;

	int version = 0;

	int saw_unbuffered_flag = 0;

	PyCompilerFlags cf;

	cf.cf_flags = 0;

	orig_argc = argc;	/* For Py_GetArgcArgv() */

	orig_argv = argv;

#ifdef RISCOS

	Py_RISCOSWimpFlag = 0;

#endif

	PySys_ResetWarnOptions();

	while ((c = _PyOS_GetOpt(argc, argv, PROGRAM_OPTS)) != EOF) {

		if (c == 'c') {

			/* -c is the last option; following arguments

			   that look like options are left for the

			   command to interpret. */

			command = (char *)malloc(strlen(_PyOS_optarg) + 2);

			if (command == NULL)

				Py_FatalError(

				   "not enough memory to copy -c argument");

			strcpy(command, _PyOS_optarg);

			strcat(command, "\n");

			break;

		}

		if (c == 'm') {

			/* -m is the last option; following arguments

			   that look like options are left for the

			   module to interpret. */

			module = (char *)malloc(strlen(_PyOS_optarg) + 2);

			if (module == NULL)

				Py_FatalError(

				   "not enough memory to copy -m argument");

			strcpy(module, _PyOS_optarg);

			break;

		}

		switch (c) {

		case 'b':

			Py_BytesWarningFlag++;

			break;

		case 'd':

			Py_DebugFlag++;

			break;

		case '3':

			Py_Py3kWarningFlag++;

			break;

		case 'Q':

			if (strcmp(_PyOS_optarg, "old") == 0) {

				Py_DivisionWarningFlag = 0;

				break;

			}

			if (strcmp(_PyOS_optarg, "warn") == 0) {

				Py_DivisionWarningFlag = 1;

				break;

			}

			if (strcmp(_PyOS_optarg, "warnall") == 0) {

				Py_DivisionWarningFlag = 2;

				break;

			}

			if (strcmp(_PyOS_optarg, "new") == 0) {

				/* This only affects __main__ */

				cf.cf_flags |= CO_FUTURE_DIVISION;

				/* And this tells the eval loop to treat

				   BINARY_DIVIDE as BINARY_TRUE_DIVIDE */

				_Py_QnewFlag = 1;

				break;

			}

			fprintf(stderr,

				"-Q option should be `-Qold', "

				"`-Qwarn', `-Qwarnall', or `-Qnew' only\n");

			return usage(2, argv[0]);

			/* NOTREACHED */

		case 'i':

			Py_InspectFlag++;

			Py_InteractiveFlag++;

			break;

		/* case 'J': reserved for Jython */

		case 'O':

			Py_OptimizeFlag++;

			break;

		case 'B':

			Py_DontWriteBytecodeFlag++;

			break;

		case 's':

			Py_NoUserSiteDirectory++;

			break;

		case 'S':

			Py_NoSiteFlag++;

			break;

		case 'E':

			Py_IgnoreEnvironmentFlag++;

			break;

		case 't':

			Py_TabcheckFlag++;

			break;

		case 'u':

			unbuffered++;

			saw_unbuffered_flag = 1;

			break;

		case 'v':

			Py_VerboseFlag++;

			break;

#ifdef RISCOS

		case 'w':

			Py_RISCOSWimpFlag = 1;

			break;

#endif

		case 'x':

			skipfirstline = 1;

			break;

		/* case 'X': reserved for implementation-specific arguments */

		case 'U':

			Py_UnicodeFlag++;

			break;

		case 'h':

		case '?':

			help++;

			break;

		case 'V':

			version++;

			break;

		case 'W':

			PySys_AddWarnOption(_PyOS_optarg);

			break;

		/* This space reserved for other options */

		default:

			return usage(2, argv[0]);

			/*NOTREACHED*/

		}

	}

	if (help)

		return usage(0, argv[0]);

	if (version) {

		fprintf(stderr, "Python %s\n", PY_VERSION);

		return 0;

	}

	if (!Py_InspectFlag &&

	    (p = Py_GETENV("PYTHONINSPECT")) && *p != '\0')

		Py_InspectFlag = 1;

	if (!saw_unbuffered_flag &&

	    (p = Py_GETENV("PYTHONUNBUFFERED")) && *p != '\0')

		unbuffered = 1;

	if (!Py_NoUserSiteDirectory &&

	    (p = Py_GETENV("PYTHONNOUSERSITE")) && *p != '\0')

		Py_NoUserSiteDirectory = 1;

	if (command == NULL && module == NULL && _PyOS_optind < argc &&

	    strcmp(argv[_PyOS_optind], "-") != 0)

	{

#ifdef __VMS

		filename = decc$translate_vms(argv[_PyOS_optind]);

		if (filename == (char *)0 || filename == (char *)-1)

			filename = argv[_PyOS_optind];

#else

		filename = argv[_PyOS_optind];

#endif

	}

	stdin_is_interactive = Py_FdIsInteractive(stdin, (char *)0);

	if (unbuffered) {

#if defined(MS_WINDOWS) || defined(__CYGWIN__)

		_setmode(fileno(stdin), O_BINARY);

		_setmode(fileno(stdout), O_BINARY);

#endif

#ifdef HAVE_SETVBUF

		setvbuf(stdin,  (char *)NULL, _IONBF, BUFSIZ);

		setvbuf(stdout, (char *)NULL, _IONBF, BUFSIZ);

		setvbuf(stderr, (char *)NULL, _IONBF, BUFSIZ);

#else /* !HAVE_SETVBUF */

		setbuf(stdin,  (char *)NULL);

		setbuf(stdout, (char *)NULL);

		setbuf(stderr, (char *)NULL);

#endif /* !HAVE_SETVBUF */

	}

	else if (Py_InteractiveFlag) {

#ifdef MS_WINDOWS

		/* Doesn't have to have line-buffered -- use unbuffered */

		/* Any set[v]buf(stdin, ...) screws up Tkinter :-( */

		setvbuf(stdout, (char *)NULL, _IONBF, BUFSIZ);

#else /* !MS_WINDOWS */

#ifdef HAVE_SETVBUF

		setvbuf(stdin,  (char *)NULL, _IOLBF, BUFSIZ);

		setvbuf(stdout, (char *)NULL, _IOLBF, BUFSIZ);

#endif /* HAVE_SETVBUF */

#endif /* !MS_WINDOWS */

		/* Leave stderr alone - it should be unbuffered anyway. */

  	}

#ifdef __VMS

	else {

		setvbuf (stdout, (char *)NULL, _IOLBF, BUFSIZ);

	}

#endif /* __VMS */

#ifdef __APPLE__

	/* On MacOS X, when the Python interpreter is embedded in an

	   application bundle, it gets executed by a bootstrapping script

	   that does os.execve() with an argv[0] that's different from the

	   actual Python executable. This is needed to keep the Finder happy,

	   or rather, to work around Apple's overly strict requirements of

	   the process name. However, we still need a usable sys.executable,

	   so the actual executable path is passed in an environment variable.

	   See Lib/plat-mac/bundlebuiler.py for details about the bootstrap

	   script. */

	if ((p = Py_GETENV("PYTHONEXECUTABLE")) && *p != '\0')

		Py_SetProgramName(p);

	else

		Py_SetProgramName(argv[0]);

#else

	Py_SetProgramName(argv[0]);

#endif

	Py_Initialize();

	if (Py_VerboseFlag ||

	    (command == NULL && filename == NULL && module == NULL && stdin_is_interactive)) {

		fprintf(stderr, "Python %s on %s\n",

			Py_GetVersion(), Py_GetPlatform());

 		if (!Py_NoSiteFlag)

 			fprintf(stderr, "%s\n", COPYRIGHT);

	}

	if (command != NULL) {

		/* Backup _PyOS_optind and force sys.argv[0] = '-c' */

		_PyOS_optind--;

		argv[_PyOS_optind] = "-c";

	}

	if (module != NULL) {

		/* Backup _PyOS_optind and force sys.argv[0] = '-c'

		   so that PySys_SetArgv correctly sets sys.path[0] to ''*/