summaryrefslogtreecommitdiffstats
path: root/Modules/main.c
blob: b4566c94af69ecb0dcdef086d1d0bb7bc77c9313 (plain)
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
/* Python interpreter main program */

#include "Python.h"
#include "osdefs.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef MS_WINDOWS
#include <fcntl.h>
#endif

#if defined(PYOS_OS2) || defined(MS_WINDOWS)
#define PYTHONHOMEHELP "<prefix>\\lib"
#else
#define PYTHONHOMEHELP "<prefix>/python2.0"
#endif

#include "pygetopt.h"

#define COPYRIGHT \
    "Type \"copyright\", \"credits\" or \"license\" for more information."

/* For Py_GetArgcArgv(); set by main() */
static char **orig_argv;
static int  orig_argc;

/* For my_readline when running under RISCOS */
#ifdef RISCOS
extern int Py_RISCOSWimpFlag;
#endif

/* Short usage message (with %s for argv0) */
static char *usage_line =
"usage: %s [option] ... [-c cmd | file | -] [arg] ...\n";

/* Long usage message, split into parts < 512 bytes */
static char *usage_top = "\
Options and arguments (and corresponding environment variables):\n\
-d     : debug output from parser (also PYTHONDEBUG=x)\n\
-i     : inspect interactively after running script, (also PYTHONINSPECT=x)\n\
         and force prompts, even if stdin does not appear to be a terminal\n\
-O     : optimize generated bytecode (a tad; also PYTHONOPTIMIZE=x)\n\
-OO    : remove doc-strings in addition to the -O optimizations\n\
-S     : don't imply 'import site' on initialization\n\
-t     : issue warnings about inconsistent tab usage (-tt: issue errors)\n\
";
static char *usage_mid = "\
-u     : unbuffered binary stdout and stderr (also PYTHONUNBUFFERED=x)\n\
-U     : Unicode literals: treats '...' literals like u'...'\n\
-v     : verbose (trace import statements) (also PYTHONVERBOSE=x)\n\
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd\n\
-h     : print this help message and exit\n\
-V     : print the Python version number and exit\n\
-W arg : warning control (arg is action:message:category:module:lineno)\n\
-c cmd : program passed in as string (terminates option list)\n\
file   : program read from script file\n\
-      : program read from stdin (default; interactive mode if a tty)\n\
";
static char *usage_bot = "\
arg ...: arguments passed to program in sys.argv[1:]\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\
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\
";


static void
usage(int exitcode, char* program)
{
	fprintf(stderr, usage_line, program);
	fprintf(stderr, usage_top);
	fprintf(stderr, usage_mid);
	fprintf(stderr, usage_bot, DELIM, DELIM, PYTHONHOMEHELP);
	exit(exitcode);
	/*NOTREACHED*/
}


/* Main program */

DL_EXPORT(int)
Py_Main(int argc, char **argv)
{
	int c;
	int sts;
	char *command = NULL;
	char *filename = NULL;
	FILE *fp = stdin;
	char *p;
	int inspect = 0;
	int unbuffered = 0;
	int skipfirstline = 0;
	int stdin_is_interactive = 0;
	int help = 0;
	int version = 0;
	PyCompilerFlags cf;

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

#ifdef RISCOS
	Py_RISCOSWimpFlag = 0;
#endif

	if ((p = getenv("PYTHONINSPECT")) && *p != '\0')
		inspect = 1;
	if ((p = getenv("PYTHONUNBUFFERED")) && *p != '\0')
		unbuffered = 1;

	PySys_ResetWarnOptions();

#ifdef RISCOS
	while ((c = getopt(argc, argv, "c:diOStuUvwxXhV")) != EOF) {
#else
	while ((c = _PyOS_GetOpt(argc, argv, "c:diOStuUvxXhVW:")) != EOF) {
#endif
		if (c == 'c') {
			/* -c is the last option; following arguments
			   that look like options are left for the
			   the command to interpret. */
			command = 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;
		}
		
		switch (c) {

		case 'd':
			Py_DebugFlag++;
			break;

		case 'i':
			inspect++;
			Py_InteractiveFlag++;
			break;

		case 'O':
			Py_OptimizeFlag++;
			break;

		case 'S':
			Py_NoSiteFlag++;
			break;

		case 't':
			Py_TabcheckFlag++;
			break;

		case 'u':
			unbuffered++;
			break;

		case 'v':
			Py_VerboseFlag++;
			break;

#ifdef RISCOS
		case 'w':
			Py_RISCOSWimpFlag = 1;
			break;
#endif

		case 'x':
			skipfirstline = 1;
			break;

		case 'U':
			Py_UnicodeFlag++;
			break;
		case 'h':
			help++;
			break;
		case 'V':
			version++;
			break;

		case 'W':
			PySys_AddWarnOption(_PyOS_optarg);
			break;

		/* This space reserved for other options */

		default:
			usage(2, argv[0]);
			/*NOTREACHED*/

		}
	}

	if (help)
		usage(0, argv[0]);

	if (version) {
		fprintf(stderr, "Python %s\n", PY_VERSION);
		exit(0);
	}

	if (command == NULL && _PyOS_optind < argc &&
	    strcmp(argv[_PyOS_optind], "-") != 0)
	{
		filename = argv[_PyOS_optind];
		if (filename != NULL) {
			if ((fp = fopen(filename, "r")) == NULL) {
				fprintf(stderr, "%s: can't open file '%s'\n",
					argv[0], filename);
				exit(2);
			}
			else if (skipfirstline) {
				int ch;
				/* Push back first newline so line numbers
				   remain the same */
				while ((ch = getc(fp)) != EOF) {
					if (ch == '\n') {
						(void)ungetc(ch, fp);
						break;
					}
				}
			}
		}
	}

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

	if (unbuffered) {
#ifdef MS_WINDOWS
		_setmode(fileno(stdin), O_BINARY);
		_setmode(fileno(stdout), O_BINARY);
#endif
#ifndef MPW
#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 /* MPW */
		/* On MPW (3.2) unbuffered seems to hang */
		setvbuf(stdin,  (char *)NULL, _IOLBF, BUFSIZ);
		setvbuf(stdout, (char *)NULL, _IOLBF, BUFSIZ);
		setvbuf(stderr, (char *)NULL, _IOLBF, BUFSIZ);
#endif /* MPW */
	}
	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. */
  	}

	Py_SetProgramName(argv[0]);
	Py_Initialize();

	if (Py_VerboseFlag ||
	    (command == NULL && filename == NULL && stdin_is_interactive))
		fprintf(stderr, "Python %s on %s\n%s\n",
			Py_GetVersion(), Py_GetPlatform(), COPYRIGHT);
	
	
	if (command != NULL) {
		/* Backup _PyOS_optind and force sys.argv[0] = '-c' */
		_PyOS_optind--;
		argv[_PyOS_optind] = "-c";
	}

	PySys_SetArgv(argc-_PyOS_optind, argv+_PyOS_optind);

	if ((inspect || (command == NULL && filename == NULL)) &&
	    isatty(fileno(stdin))) {
		PyObject *v;
		v = PyImport_ImportModule("readline");
		if (v == NULL)
			PyErr_Clear();
		else
			Py_DECREF(v);
	}

	cf.cf_nested_scopes = 0;

	if (command) {
		sts = PyRun_SimpleString(command) != 0;
		free(command);
	}
	else {
		if (filename == NULL && stdin_is_interactive) {
			char *startup = getenv("PYTHONSTARTUP");
			if (startup != NULL && startup[0] != '\0') {
				FILE *fp = fopen(startup, "r");
				if (fp != NULL) {
					(void) PyRun_SimpleFile(fp, startup);
					PyErr_Clear();
					fclose(fp);
				}
			}
		}
		/* XXX */
		sts = PyRun_AnyFileExFlags(
			fp,
			filename == NULL ? "<stdin>" : filename,
			filename != NULL, &cf) != 0;
	}

	if (inspect && stdin_is_interactive &&
	    (filename != NULL || command != NULL))
		/* XXX */
		sts = PyRun_AnyFileFlags(stdin, "<stdin>", &cf) != 0;

	Py_Finalize();
#ifdef RISCOS
	if(Py_RISCOSWimpFlag)
                fprintf(stderr, "\x0cq\x0c"); /* make frontend quit */
#endif

#ifdef __INSURE__
	/* Insure++ is a memory analysis tool that aids in discovering
	 * memory leaks and other memory problems.  On Python exit, the
	 * interned string dictionary is flagged as being in use at exit
	 * (which it is).  Under normal circumstances, this is fine because
	 * the memory will be automatically reclaimed by the system.  Under
	 * memory debugging, it's a huge source of useless noise, so we
	 * trade off slower shutdown for less distraction in the memory
	 * reports.  -baw
	 */
	_Py_ReleaseInternedStrings();
#endif /* __INSURE__ */

	return sts;
}


/* Make the *original* argc/argv available to other modules.
   This is rare, but it is needed by the secureware extension. */

void
Py_GetArgcArgv(int *argc, char ***argv)
{
	*argc = orig_argc;
	*argv = orig_argv;
}