1 /*
2 * Copyright (C) 2011-2013 Vinay Sajip.
3 * Licensed to PSF under a contributor agreement.
4 *
5 * Based on the work of:
6 *
7 * Mark Hammond (original author of Python version)
8 * Curt Hagenlocher (job management)
9 */
10
11 #include <windows.h>
12 #include <shlobj.h>
13 #include <stdio.h>
14 #include <tchar.h>
15
16 #define BUFSIZE 256
17 #define MSGSIZE 1024
18
19 /* Build options. */
20 #define SKIP_PREFIX
21 #define SEARCH_PATH
22
23 /* Error codes */
24
25 #define RC_NO_STD_HANDLES 100
26 #define RC_CREATE_PROCESS 101
27 #define RC_BAD_VIRTUAL_PATH 102
28 #define RC_NO_PYTHON 103
29 #define RC_NO_MEMORY 104
30 /*
31 * SCRIPT_WRAPPER is used to choose one of the variants of an executable built
32 * from this source file. If not defined, the PEP 397 Python launcher is built;
33 * if defined, a script launcher of the type used by setuptools is built, which
34 * looks for a script name related to the executable name and runs that script
35 * with the appropriate Python interpreter.
36 *
37 * SCRIPT_WRAPPER should be undefined in the source, and defined in a VS project
38 * which builds the setuptools-style launcher.
39 */
40 #if defined(SCRIPT_WRAPPER)
41 #define RC_NO_SCRIPT 105
42 #endif
43 /*
44 * VENV_REDIRECT is used to choose the variant that looks for an adjacent or
45 * one-level-higher pyvenv.cfg, and uses its "home" property to locate and
46 * launch the original python.exe.
47 */
48 #if defined(VENV_REDIRECT)
49 #define RC_NO_VENV_CFG 106
50 #define RC_BAD_VENV_CFG 107
51 #endif
52
53 /* Just for now - static definition */
54
55 static FILE * log_fp = NULL;
56
57 static wchar_t *
58 skip_whitespace(wchar_t * p)
59 {
60 while (*p && isspace(*p))
61 ++p;
62 return p;
63 }
64
65 static void
66 debug(wchar_t * format, ...)
67 {
68 va_list va;
69
70 if (log_fp != NULL) {
71 va_start(va, format);
72 vfwprintf_s(log_fp, format, va);
73 va_end(va);
74 }
75 }
76
77 static void
78 winerror(int rc, wchar_t * message, int size)
79 {
80 FormatMessageW(
81 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
82 NULL, rc, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
83 message, size, NULL);
84 }
85
86 static void
87 error(int rc, wchar_t * format, ... )
88 {
89 va_list va;
90 wchar_t message[MSGSIZE];
91 wchar_t win_message[MSGSIZE];
92 int len;
93
94 va_start(va, format);
95 len = _vsnwprintf_s(message, MSGSIZE, _TRUNCATE, format, va);
96 va_end(va);
97
98 if (rc == 0) { /* a Windows error */
99 winerror(GetLastError(), win_message, MSGSIZE);
100 if (len >= 0) {
101 _snwprintf_s(&message[len], MSGSIZE - len, _TRUNCATE, L": %ls",
102 win_message);
103 }
104 }
105
106 #if !defined(_WINDOWS)
107 fwprintf(stderr, L"%ls\n", message);
108 #else
109 MessageBoxW(NULL, message, L"Python Launcher is sorry to say ...",
110 MB_OK);
111 #endif
112 exit(rc);
113 }
114
115 /*
116 * This function is here to simplify memory management
117 * and to treat blank values as if they are absent.
118 */
119 static wchar_t * get_env(wchar_t * key)
120 {
121 /* This is not thread-safe, just like getenv */
122 static wchar_t buf[BUFSIZE];
123 DWORD result = GetEnvironmentVariableW(key, buf, BUFSIZE);
124
125 if (result >= BUFSIZE) {
126 /* Large environment variable. Accept some leakage */
127 wchar_t *buf2 = (wchar_t*)malloc(sizeof(wchar_t) * (result+1));
128 if (buf2 == NULL) {
129 error(RC_NO_MEMORY, L"Could not allocate environment buffer");
130 }
131 GetEnvironmentVariableW(key, buf2, result);
132 return buf2;
133 }
134
135 if (result == 0)
136 /* Either some error, e.g. ERROR_ENVVAR_NOT_FOUND,
137 or an empty environment variable. */
138 return NULL;
139
140 return buf;
141 }
142
143 #if defined(_DEBUG)
144 /* Do not define EXECUTABLEPATH_VALUE in debug builds as it'll
145 never point to the debug build. */
146 #if defined(_WINDOWS)
147
148 #define PYTHON_EXECUTABLE L"pythonw_d.exe"
149
150 #else
151
152 #define PYTHON_EXECUTABLE L"python_d.exe"
153
154 #endif
155 #else
156 #if defined(_WINDOWS)
157
158 #define PYTHON_EXECUTABLE L"pythonw.exe"
159 #define EXECUTABLEPATH_VALUE L"WindowedExecutablePath"
160
161 #else
162
163 #define PYTHON_EXECUTABLE L"python.exe"
164 #define EXECUTABLEPATH_VALUE L"ExecutablePath"
165
166 #endif
167 #endif
168
169 #define MAX_VERSION_SIZE 8
170
171 typedef struct {
172 wchar_t version[MAX_VERSION_SIZE]; /* m.n */
173 int bits; /* 32 or 64 */
174 wchar_t executable[MAX_PATH];
175 wchar_t exe_display[MAX_PATH];
176 } INSTALLED_PYTHON;
177
178 /*
179 * To avoid messing about with heap allocations, just assume we can allocate
180 * statically and never have to deal with more versions than this.
181 */
182 #define MAX_INSTALLED_PYTHONS 100
183
184 static INSTALLED_PYTHON installed_pythons[MAX_INSTALLED_PYTHONS];
185
186 static size_t num_installed_pythons = 0;
187
188 /*
189 * To hold SOFTWARE\Python\PythonCore\X.Y...\InstallPath
190 * The version name can be longer than MAX_VERSION_SIZE, but will be
191 * truncated to just X.Y for comparisons.
192 */
193 #define IP_BASE_SIZE 80
194 #define IP_VERSION_SIZE 8
195 #define IP_SIZE (IP_BASE_SIZE + IP_VERSION_SIZE)
196 #define CORE_PATH L"SOFTWARE\\Python\\PythonCore"
197 /*
198 * Installations from the Microsoft Store will set the same registry keys,
199 * but because of a limitation in Windows they cannot be enumerated normally
200 * (unless you have no other Python installations... which is probably false
201 * because that's the most likely way to get this launcher!)
202 * This key is under HKEY_LOCAL_MACHINE
203 */
204 #define LOOKASIDE_PATH L"SOFTWARE\\Microsoft\\AppModel\\Lookaside\\user\\Software\\Python\\PythonCore"
205
206 static wchar_t * location_checks[] = {
207 L"\\",
208 L"\\PCbuild\\win32\\",
209 L"\\PCbuild\\amd64\\",
210 /* To support early 32bit versions of Python that stuck the build binaries
211 * directly in PCbuild... */
212 L"\\PCbuild\\",
213 NULL
214 };
215
216 static INSTALLED_PYTHON *
217 find_existing_python(const wchar_t * path)
218 {
219 INSTALLED_PYTHON * result = NULL;
220 size_t i;
221 INSTALLED_PYTHON * ip;
222
223 for (i = 0, ip = installed_pythons; i < num_installed_pythons; i++, ip++) {
224 if (_wcsicmp(path, ip->executable) == 0) {
225 result = ip;
226 break;
227 }
228 }
229 return result;
230 }
231
232 static INSTALLED_PYTHON *
233 find_existing_python2(int bits, const wchar_t * version)
234 {
235 INSTALLED_PYTHON * result = NULL;
236 size_t i;
237 INSTALLED_PYTHON * ip;
238
239 for (i = 0, ip = installed_pythons; i < num_installed_pythons; i++, ip++) {
240 if (bits == ip->bits && _wcsicmp(version, ip->version) == 0) {
241 result = ip;
242 break;
243 }
244 }
245 return result;
246 }
247
248 static void
249 _locate_pythons_for_key(HKEY root, LPCWSTR subkey, REGSAM flags, int bits,
250 int display_name_only)
251 {
252 HKEY core_root, ip_key;
253 LSTATUS status = RegOpenKeyExW(root, subkey, 0, flags, &core_root);
254 wchar_t message[MSGSIZE];
255 DWORD i;
256 size_t n;
257 BOOL ok, append_name;
258 DWORD type, data_size, attrs;
259 INSTALLED_PYTHON * ip, * pip;
260 wchar_t ip_version[IP_VERSION_SIZE];
261 wchar_t ip_path[IP_SIZE];
262 wchar_t * check;
263 wchar_t ** checkp;
264 wchar_t *key_name = (root == HKEY_LOCAL_MACHINE) ? L"HKLM" : L"HKCU";
265
266 if (status != ERROR_SUCCESS)
267 debug(L"locate_pythons_for_key: unable to open PythonCore key in %ls\n",
268 key_name);
269 else {
270 ip = &installed_pythons[num_installed_pythons];
271 for (i = 0; num_installed_pythons < MAX_INSTALLED_PYTHONS; i++) {
272 status = RegEnumKeyW(core_root, i, ip_version, IP_VERSION_SIZE);
273 if (status != ERROR_SUCCESS) {
274 if (status != ERROR_NO_MORE_ITEMS) {
275 /* unexpected error */
276 winerror(status, message, MSGSIZE);
277 debug(L"Can't enumerate registry key for version %ls: %ls\n",
278 ip_version, message);
279 }
280 break;
281 }
282 else {
283 wcsncpy_s(ip->version, MAX_VERSION_SIZE, ip_version,
284 MAX_VERSION_SIZE-1);
285 /* Still treating version as "x.y" rather than sys.winver
286 * When PEP 514 tags are properly used, we shouldn't need
287 * to strip this off here.
288 */
289 check = wcsrchr(ip->version, L'-');
290 if (check && !wcscmp(check, L"-32")) {
291 *check = L'\0';
292 }
293 _snwprintf_s(ip_path, IP_SIZE, _TRUNCATE,
294 L"%ls\\%ls\\InstallPath", subkey, ip_version);
295 status = RegOpenKeyExW(root, ip_path, 0, flags, &ip_key);
296 if (status != ERROR_SUCCESS) {
297 winerror(status, message, MSGSIZE);
298 /* Note: 'message' already has a trailing \n*/
299 debug(L"%ls\\%ls: %ls", key_name, ip_path, message);
300 continue;
301 }
302 data_size = sizeof(ip->executable) - 1;
303 append_name = FALSE;
304 #ifdef EXECUTABLEPATH_VALUE
305 status = RegQueryValueExW(ip_key, EXECUTABLEPATH_VALUE, NULL, &type,
306 (LPBYTE)ip->executable, &data_size);
307 #else
308 status = ERROR_FILE_NOT_FOUND; /* actual error doesn't matter */
309 #endif
310 if (status != ERROR_SUCCESS || type != REG_SZ || !data_size) {
311 append_name = TRUE;
312 data_size = sizeof(ip->executable) - 1;
313 status = RegQueryValueExW(ip_key, NULL, NULL, &type,
314 (LPBYTE)ip->executable, &data_size);
315 if (status != ERROR_SUCCESS) {
316 winerror(status, message, MSGSIZE);
317 debug(L"%ls\\%ls: %ls\n", key_name, ip_path, message);
318 RegCloseKey(ip_key);
319 continue;
320 }
321 }
322 RegCloseKey(ip_key);
323 if (type != REG_SZ) {
324 continue;
325 }
326
327 data_size = data_size / sizeof(wchar_t) - 1; /* for NUL */
328 if (ip->executable[data_size - 1] == L'\\')
329 --data_size; /* reg value ended in a backslash */
330 /* ip->executable is data_size long */
331 for (checkp = location_checks; *checkp; ++checkp) {
332 check = *checkp;
333 if (append_name) {
334 _snwprintf_s(&ip->executable[data_size],
335 MAX_PATH - data_size,
336 MAX_PATH - data_size,
337 L"%ls%ls", check, PYTHON_EXECUTABLE);
338 }
339 attrs = GetFileAttributesW(ip->executable);
340 if (attrs == INVALID_FILE_ATTRIBUTES) {
341 winerror(GetLastError(), message, MSGSIZE);
342 debug(L"locate_pythons_for_key: %ls: %ls",
343 ip->executable, message);
344 }
345 else if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
346 debug(L"locate_pythons_for_key: '%ls' is a directory\n",
347 ip->executable);
348 }
349 else if (find_existing_python(ip->executable)) {
350 debug(L"locate_pythons_for_key: %ls: already found\n",
351 ip->executable);
352 }
353 else {
354 /* check the executable type. */
355 if (bits) {
356 ip->bits = bits;
357 } else {
358 ok = GetBinaryTypeW(ip->executable, &attrs);
359 if (!ok) {
360 debug(L"Failure getting binary type: %ls\n",
361 ip->executable);
362 }
363 else {
364 if (attrs == SCS_64BIT_BINARY)
365 ip->bits = 64;
366 else if (attrs == SCS_32BIT_BINARY)
367 ip->bits = 32;
368 else
369 ip->bits = 0;
370 }
371 }
372 if (ip->bits == 0) {
373 debug(L"locate_pythons_for_key: %ls: \
374 invalid binary type: %X\n",
375 ip->executable, attrs);
376 }
377 else {
378 if (display_name_only) {
379 /* display just the executable name. This is
380 * primarily for the Store installs */
381 const wchar_t *name = wcsrchr(ip->executable, L'\\');
382 if (name) {
383 wcscpy_s(ip->exe_display, MAX_PATH, name+1);
384 }
385 }
386 if (wcschr(ip->executable, L' ') != NULL) {
387 /* has spaces, so quote, and set original as
388 * the display name */
389 if (!ip->exe_display[0]) {
390 wcscpy_s(ip->exe_display, MAX_PATH, ip->executable);
391 }
392 n = wcslen(ip->executable);
393 memmove(&ip->executable[1],
394 ip->executable, n * sizeof(wchar_t));
395 ip->executable[0] = L'\"';
396 ip->executable[n + 1] = L'\"';
397 ip->executable[n + 2] = L'\0';
398 }
399 debug(L"locate_pythons_for_key: %ls \
400 is a %dbit executable\n",
401 ip->executable, ip->bits);
402 if (find_existing_python2(ip->bits, ip->version)) {
403 debug(L"locate_pythons_for_key: %ls-%i: already \
404 found\n", ip->version, ip->bits);
405 }
406 else {
407 ++num_installed_pythons;
408 pip = ip++;
409 if (num_installed_pythons >=
410 MAX_INSTALLED_PYTHONS)
411 break;
412 }
413 }
414 }
415 }
416 }
417 }
418 RegCloseKey(core_root);
419 }
420 }
421
422 static int
423 compare_pythons(const void * p1, const void * p2)
424 {
425 INSTALLED_PYTHON * ip1 = (INSTALLED_PYTHON *) p1;
426 INSTALLED_PYTHON * ip2 = (INSTALLED_PYTHON *) p2;
427 /* note reverse sorting on version */
428 int result = CompareStringW(LOCALE_INVARIANT, SORT_DIGITSASNUMBERS,
429 ip2->version, -1, ip1->version, -1);
430 switch (result) {
431 case 0:
432 error(0, L"CompareStringW failed");
433 return 0;
434 case CSTR_LESS_THAN:
435 return -1;
436 case CSTR_EQUAL:
437 return ip2->bits - ip1->bits; /* 64 before 32 */
438 case CSTR_GREATER_THAN:
439 return 1;
440 default:
441 return 0; // This should never be reached.
442 }
443 }
444
445 static void
446 locate_pythons_for_key(HKEY root, REGSAM flags)
447 {
448 _locate_pythons_for_key(root, CORE_PATH, flags, 0, FALSE);
449 }
450
451 static void
452 locate_store_pythons(void)
453 {
454 #if defined(_M_X64)
455 /* 64bit process, so look in native registry */
456 _locate_pythons_for_key(HKEY_LOCAL_MACHINE, LOOKASIDE_PATH,
457 KEY_READ, 64, TRUE);
458 #else
459 /* 32bit process, so check that we're on 64bit OS */
460 BOOL f64 = FALSE;
461 if (IsWow64Process(GetCurrentProcess(), &f64) && f64) {
462 _locate_pythons_for_key(HKEY_LOCAL_MACHINE, LOOKASIDE_PATH,
463 KEY_READ | KEY_WOW64_64KEY, 64, TRUE);
464 }
465 #endif
466 }
467
468 static void
469 locate_venv_python(void)
470 {
471 static wchar_t venv_python[MAX_PATH];
472 INSTALLED_PYTHON * ip;
473 wchar_t *virtual_env = get_env(L"VIRTUAL_ENV");
474 DWORD attrs;
475
476 /* Check for VIRTUAL_ENV environment variable */
477 if (virtual_env == NULL || virtual_env[0] == L'\0') {
478 return;
479 }
480
481 /* Check for a python executable in the venv */
482 debug(L"Checking for Python executable in virtual env '%ls'\n", virtual_env);
483 _snwprintf_s(venv_python, MAX_PATH, _TRUNCATE,
484 L"%ls\\Scripts\\%ls", virtual_env, PYTHON_EXECUTABLE);
485 attrs = GetFileAttributesW(venv_python);
486 if (attrs == INVALID_FILE_ATTRIBUTES) {
487 debug(L"Python executable %ls missing from virtual env\n", venv_python);
488 return;
489 }
490
491 ip = &installed_pythons[num_installed_pythons++];
492 wcscpy_s(ip->executable, MAX_PATH, venv_python);
493 ip->bits = 0;
494 wcscpy_s(ip->version, MAX_VERSION_SIZE, L"venv");
495 }
496
497 static void
498 locate_all_pythons(void)
499 {
500 /* venv Python is highest priority */
501 locate_venv_python();
502 #if defined(_M_X64)
503 /* If we are a 64bit process, first hit the 32bit keys. */
504 debug(L"locating Pythons in 32bit registry\n");
505 locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ | KEY_WOW64_32KEY);
506 locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ | KEY_WOW64_32KEY);
507 #else
508 /* If we are a 32bit process on a 64bit Windows, first hit the 64bit keys.*/
509 BOOL f64 = FALSE;
510 if (IsWow64Process(GetCurrentProcess(), &f64) && f64) {
511 debug(L"locating Pythons in 64bit registry\n");
512 locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ | KEY_WOW64_64KEY);
513 locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ | KEY_WOW64_64KEY);
514 }
515 #endif
516 /* now hit the "native" key for this process bittedness. */
517 debug(L"locating Pythons in native registry\n");
518 locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ);
519 locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ);
520 /* Store-installed Python is lowest priority */
521 locate_store_pythons();
522 qsort(installed_pythons, num_installed_pythons, sizeof(INSTALLED_PYTHON),
523 compare_pythons);
524 }
525
526 static INSTALLED_PYTHON *
527 find_python_by_version(wchar_t const * wanted_ver)
528 {
529 INSTALLED_PYTHON * result = NULL;
530 INSTALLED_PYTHON * ip = installed_pythons;
531 size_t i, n;
532 size_t wlen = wcslen(wanted_ver);
533 int bits = 0;
534
535 if (wcsstr(wanted_ver, L"-32")) {
536 bits = 32;
537 wlen -= wcslen(L"-32");
538 }
539 else if (wcsstr(wanted_ver, L"-64")) { /* Added option to select 64 bit explicitly */
540 bits = 64;
541 wlen -= wcslen(L"-64");
542 }
543 for (i = 0; i < num_installed_pythons; i++, ip++) {
544 n = wcslen(ip->version);
545 /*
546 * If wlen is greater than 1, we're probably trying to find a specific
547 * version and thus want an exact match: 3.1 != 3.10. Otherwise, we
548 * just want a prefix match.
549 */
550 if ((wlen > 1) && (n != wlen)) {
551 continue;
552 }
553 if (n > wlen) {
554 n = wlen;
555 }
556 if ((wcsncmp(ip->version, wanted_ver, n) == 0) &&
557 /* bits == 0 => don't care */
558 ((bits == 0) || (ip->bits == bits))) {
559 result = ip;
560 break;
561 }
562 }
563 return result;
564 }
565
566
567 static wchar_t appdata_ini_path[MAX_PATH];
568 static wchar_t launcher_ini_path[MAX_PATH];
569
570 /*
571 * Get a value either from the environment or a configuration file.
572 * The key passed in will either be "python", "python2" or "python3".
573 */
574 static wchar_t *
575 get_configured_value(wchar_t * key)
576 {
577 /*
578 * Note: this static value is used to return a configured value
579 * obtained either from the environment or configuration file.
580 * This should be OK since there wouldn't be any concurrent calls.
581 */
582 static wchar_t configured_value[MSGSIZE];
583 wchar_t * result = NULL;
584 wchar_t * found_in = L"environment";
585 DWORD size;
586
587 /* First, search the environment. */
588 _snwprintf_s(configured_value, MSGSIZE, _TRUNCATE, L"py_%ls", key);
589 result = get_env(configured_value);
590 if (result == NULL && appdata_ini_path[0]) {
591 /* Not in environment: check local configuration. */
592 size = GetPrivateProfileStringW(L"defaults", key, NULL,
593 configured_value, MSGSIZE,
594 appdata_ini_path);
595 if (size > 0) {
596 result = configured_value;
597 found_in = appdata_ini_path;
598 }
599 }
600 if (result == NULL && launcher_ini_path[0]) {
601 /* Not in environment or local: check global configuration. */
602 size = GetPrivateProfileStringW(L"defaults", key, NULL,
603 configured_value, MSGSIZE,
604 launcher_ini_path);
605 if (size > 0) {
606 result = configured_value;
607 found_in = launcher_ini_path;
608 }
609 }
610 if (result) {
611 debug(L"found configured value '%ls=%ls' in %ls\n",
612 key, result, found_in ? found_in : L"(unknown)");
613 } else {
614 debug(L"found no configured value for '%ls'\n", key);
615 }
616 return result;
617 }
618
619 static INSTALLED_PYTHON *
620 locate_python(wchar_t * wanted_ver, BOOL from_shebang)
621 {
622 static wchar_t config_key [] = { L"pythonX" };
623 static wchar_t * last_char = &config_key[sizeof(config_key) /
624 sizeof(wchar_t) - 2];
625 INSTALLED_PYTHON * result = NULL;
626 size_t n = wcslen(wanted_ver);
627 wchar_t * configured_value;
628
629 if (num_installed_pythons == 0)
630 locate_all_pythons();
631
632 if (n == 1) { /* just major version specified */
633 *last_char = *wanted_ver;
634 configured_value = get_configured_value(config_key);
635 if (configured_value != NULL)
636 wanted_ver = configured_value;
637 }
638 if (*wanted_ver) {
639 result = find_python_by_version(wanted_ver);
640 debug(L"search for Python version '%ls' found ", wanted_ver);
641 if (result) {
642 debug(L"'%ls'\n", result->executable);
643 } else {
644 debug(L"no interpreter\n");
645 }
646 }
647 else {
648 *last_char = L'\0'; /* look for an overall default */
649 result = find_python_by_version(L"venv");
650 if (result == NULL) {
651 configured_value = get_configured_value(config_key);
652 if (configured_value)
653 result = find_python_by_version(configured_value);
654 }
655 /* Not found a value yet - try by major version.
656 * If we're looking for an interpreter specified in a shebang line,
657 * we want to try Python 2 first, then Python 3 (for Unix and backward
658 * compatibility). If we're being called interactively, assume the user
659 * wants the latest version available, so try Python 3 first, then
660 * Python 2.
661 */
662 if (result == NULL)
663 result = find_python_by_version(from_shebang ? L"2" : L"3");
664 if (result == NULL)
665 result = find_python_by_version(from_shebang ? L"3" : L"2");
666 debug(L"search for default Python found ");
667 if (result) {
668 debug(L"version %ls at '%ls'\n",
669 result->version, result->executable);
670 } else {
671 debug(L"no interpreter\n");
672 }
673 }
674 return result;
675 }
676
677 #if defined(SCRIPT_WRAPPER)
678 /*
679 * Check for a script located alongside the executable
680 */
681
682 #if defined(_WINDOWS)
683 #define SCRIPT_SUFFIX L"-script.pyw"
684 #else
685 #define SCRIPT_SUFFIX L"-script.py"
686 #endif
687
688 static wchar_t wrapped_script_path[MAX_PATH];
689
690 /* Locate the script being wrapped.
691 *
692 * This code should store the name of the wrapped script in
693 * wrapped_script_path, or terminate the program with an error if there is no
694 * valid wrapped script file.
695 */
696 static void
697 locate_wrapped_script(void)
698 {
699 wchar_t * p;
700 size_t plen;
701 DWORD attrs;
702
703 plen = GetModuleFileNameW(NULL, wrapped_script_path, MAX_PATH);
704 p = wcsrchr(wrapped_script_path, L'.');
705 if (p == NULL) {
706 debug(L"GetModuleFileNameW returned value has no extension: %ls\n",
707 wrapped_script_path);
708 error(RC_NO_SCRIPT, L"Wrapper name '%ls' is not valid.", wrapped_script_path);
709 }
710
711 wcsncpy_s(p, MAX_PATH - (p - wrapped_script_path) + 1, SCRIPT_SUFFIX, _TRUNCATE);
712 attrs = GetFileAttributesW(wrapped_script_path);
713 if (attrs == INVALID_FILE_ATTRIBUTES) {
714 debug(L"File '%ls' non-existent\n", wrapped_script_path);
715 error(RC_NO_SCRIPT, L"Script file '%ls' is not present.", wrapped_script_path);
716 }
717
718 debug(L"Using wrapped script file '%ls'\n", wrapped_script_path);
719 }
720 #endif
721
722 /*
723 * Process creation code
724 */
725
726 static BOOL
727 safe_duplicate_handle(HANDLE in, HANDLE * pout)
728 {
729 BOOL ok;
730 HANDLE process = GetCurrentProcess();
731 DWORD rc;
732
733 *pout = NULL;
734 ok = DuplicateHandle(process, in, process, pout, 0, TRUE,
735 DUPLICATE_SAME_ACCESS);
736 if (!ok) {
737 rc = GetLastError();
738 if (rc == ERROR_INVALID_HANDLE) {
739 debug(L"DuplicateHandle returned ERROR_INVALID_HANDLE\n");
740 ok = TRUE;
741 }
742 else {
743 debug(L"DuplicateHandle returned %d\n", rc);
744 }
745 }
746 return ok;
747 }
748
749 static BOOL WINAPI
750 ctrl_c_handler(DWORD code)
751 {
752 return TRUE; /* We just ignore all control events. */
753 }
754
755 static void
756 run_child(wchar_t * cmdline)
757 {
758 HANDLE job;
759 JOBOBJECT_EXTENDED_LIMIT_INFORMATION info;
760 DWORD rc;
761 BOOL ok;
762 STARTUPINFOW si;
763 PROCESS_INFORMATION pi;
764
765 #if defined(_WINDOWS)
766 /*
767 When explorer launches a Windows (GUI) application, it displays
768 the "app starting" (the "pointer + hourglass") cursor for a number
769 of seconds, or until the app does something UI-ish (eg, creating a
770 window, or fetching a message). As this launcher doesn't do this
771 directly, that cursor remains even after the child process does these
772 things. We avoid that by doing a simple post+get message.
773 See http://bugs.python.org/issue17290
774 */
775 MSG msg;
776
777 PostMessage(0, 0, 0, 0);
778 GetMessage(&msg, 0, 0, 0);
779 #endif
780
781 debug(L"run_child: about to run '%ls'\n", cmdline);
782 job = CreateJobObject(NULL, NULL);
783 ok = QueryInformationJobObject(job, JobObjectExtendedLimitInformation,
784 &info, sizeof(info), &rc);
785 if (!ok || (rc != sizeof(info)) || !job)
786 error(RC_CREATE_PROCESS, L"Job information querying failed");
787 info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE |
788 JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK;
789 ok = SetInformationJobObject(job, JobObjectExtendedLimitInformation, &info,
790 sizeof(info));
791 if (!ok)
792 error(RC_CREATE_PROCESS, L"Job information setting failed");
793 memset(&si, 0, sizeof(si));
794 GetStartupInfoW(&si);
795 ok = safe_duplicate_handle(GetStdHandle(STD_INPUT_HANDLE), &si.hStdInput);
796 if (!ok)
797 error(RC_NO_STD_HANDLES, L"stdin duplication failed");
798 ok = safe_duplicate_handle(GetStdHandle(STD_OUTPUT_HANDLE), &si.hStdOutput);
799 if (!ok)
800 error(RC_NO_STD_HANDLES, L"stdout duplication failed");
801 ok = safe_duplicate_handle(GetStdHandle(STD_ERROR_HANDLE), &si.hStdError);
802 if (!ok)
803 error(RC_NO_STD_HANDLES, L"stderr duplication failed");
804
805 ok = SetConsoleCtrlHandler(ctrl_c_handler, TRUE);
806 if (!ok)
807 error(RC_CREATE_PROCESS, L"control handler setting failed");
808
809 si.dwFlags = STARTF_USESTDHANDLES;
810 ok = CreateProcessW(NULL, cmdline, NULL, NULL, TRUE,
811 0, NULL, NULL, &si, &pi);
812 if (!ok)
813 error(RC_CREATE_PROCESS, L"Unable to create process using '%ls'", cmdline);
814 AssignProcessToJobObject(job, pi.hProcess);
815 CloseHandle(pi.hThread);
816 WaitForSingleObjectEx(pi.hProcess, INFINITE, FALSE);
817 ok = GetExitCodeProcess(pi.hProcess, &rc);
818 if (!ok)
819 error(RC_CREATE_PROCESS, L"Failed to get exit code of process");
820 debug(L"child process exit code: %d\n", rc);
821 exit(rc);
822 }
823
824 static void
825 invoke_child(wchar_t * executable, wchar_t * suffix, wchar_t * cmdline)
826 {
827 wchar_t * child_command;
828 size_t child_command_size;
829 BOOL no_suffix = (suffix == NULL) || (*suffix == L'\0');
830 BOOL no_cmdline = (*cmdline == L'\0');
831
832 if (no_suffix && no_cmdline)
833 run_child(executable);
834 else {
835 if (no_suffix) {
836 /* add 2 for space separator + terminating NUL. */
837 child_command_size = wcslen(executable) + wcslen(cmdline) + 2;
838 }
839 else {
840 /* add 3 for 2 space separators + terminating NUL. */
841 child_command_size = wcslen(executable) + wcslen(suffix) +
842 wcslen(cmdline) + 3;
843 }
844 child_command = calloc(child_command_size, sizeof(wchar_t));
845 if (child_command == NULL)
846 error(RC_CREATE_PROCESS, L"unable to allocate %zd bytes for child command.",
847 child_command_size);
848 if (no_suffix)
849 _snwprintf_s(child_command, child_command_size,
850 child_command_size - 1, L"%ls %ls",
851 executable, cmdline);
852 else
853 _snwprintf_s(child_command, child_command_size,
854 child_command_size - 1, L"%ls %ls %ls",
855 executable, suffix, cmdline);
856 run_child(child_command);
857 free(child_command);
858 }
859 }
860
861 typedef struct {
862 wchar_t *shebang;
863 BOOL search;
864 } SHEBANG;
865
866 static SHEBANG builtin_virtual_paths [] = {
867 { L"/usr/bin/env python", TRUE },
868 { L"/usr/bin/python", FALSE },
869 { L"/usr/local/bin/python", FALSE },
870 { L"python", FALSE },
871 { NULL, FALSE },
872 };
873
874 /* For now, a static array of commands. */
875
876 #define MAX_COMMANDS 100
877
878 typedef struct {
879 wchar_t key[MAX_PATH];
880 wchar_t value[MSGSIZE];
881 } COMMAND;
882
883 static COMMAND commands[MAX_COMMANDS];
884 static int num_commands = 0;
885
886 #if defined(SKIP_PREFIX)
887
888 static wchar_t * builtin_prefixes [] = {
889 /* These must be in an order that the longest matches should be found,
890 * i.e. if the prefix is "/usr/bin/env ", it should match that entry
891 * *before* matching "/usr/bin/".
892 */
893 L"/usr/bin/env ",
894 L"/usr/bin/",
895 L"/usr/local/bin/",
896 NULL
897 };
898
899 static wchar_t * skip_prefix(wchar_t * name)
900 {
901 wchar_t ** pp = builtin_prefixes;
902 wchar_t * result = name;
903 wchar_t * p;
904 size_t n;
905
906 for (; p = *pp; pp++) {
907 n = wcslen(p);
908 if (_wcsnicmp(p, name, n) == 0) {
909 result += n; /* skip the prefix */
910 if (p[n - 1] == L' ') /* No empty strings in table, so n > 1 */
911 result = skip_whitespace(result);
912 break;
913 }
914 }
915 return result;
916 }
917
918 #endif
919
920 #if defined(SEARCH_PATH)
921
922 static COMMAND path_command;
923
924 static COMMAND * find_on_path(wchar_t * name)
925 {
926 wchar_t * pathext;
927 size_t varsize;
928 wchar_t * context = NULL;
929 wchar_t * extension;
930 COMMAND * result = NULL;
931 DWORD len;
932 errno_t rc;
933
934 wcscpy_s(path_command.key, MAX_PATH, name);
935 if (wcschr(name, L'.') != NULL) {
936 /* assume it has an extension. */
937 len = SearchPathW(NULL, name, NULL, MSGSIZE, path_command.value, NULL);
938 if (len) {
939 result = &path_command;
940 }
941 }
942 else {
943 /* No extension - search using registered extensions. */
944 rc = _wdupenv_s(&pathext, &varsize, L"PATHEXT");
945 if (rc == 0) {
946 extension = wcstok_s(pathext, L";", &context);
947 while (extension) {
948 len = SearchPathW(NULL, name, extension, MSGSIZE, path_command.value, NULL);
949 if (len) {
950 result = &path_command;
951 break;
952 }
953 extension = wcstok_s(NULL, L";", &context);
954 }
955 free(pathext);
956 }
957 }
958 return result;
959 }
960
961 #endif
962
963 static COMMAND * find_command(wchar_t * name)
964 {
965 COMMAND * result = NULL;
966 COMMAND * cp = commands;
967 int i;
968
969 for (i = 0; i < num_commands; i++, cp++) {
970 if (_wcsicmp(cp->key, name) == 0) {
971 result = cp;
972 break;
973 }
974 }
975 #if defined(SEARCH_PATH)
976 if (result == NULL)
977 result = find_on_path(name);
978 #endif
979 return result;
980 }
981
982 static void
983 update_command(COMMAND * cp, wchar_t * name, wchar_t * cmdline)
984 {
985 wcsncpy_s(cp->key, MAX_PATH, name, _TRUNCATE);
986 wcsncpy_s(cp->value, MSGSIZE, cmdline, _TRUNCATE);
987 }
988
989 static void
990 add_command(wchar_t * name, wchar_t * cmdline)
991 {
992 if (num_commands >= MAX_COMMANDS) {
993 debug(L"can't add %ls = '%ls': no room\n", name, cmdline);
994 }
995 else {
996 COMMAND * cp = &commands[num_commands++];
997
998 update_command(cp, name, cmdline);
999 }
1000 }
1001
1002 static void
1003 read_config_file(wchar_t * config_path)
1004 {
1005 wchar_t keynames[MSGSIZE];
1006 wchar_t value[MSGSIZE];
1007 DWORD read;
1008 wchar_t * key;
1009 COMMAND * cp;
1010 wchar_t * cmdp;
1011
1012 read = GetPrivateProfileStringW(L"commands", NULL, NULL, keynames, MSGSIZE,
1013 config_path);
1014 if (read == MSGSIZE - 1) {
1015 debug(L"read_commands: %ls: not enough space for names\n", config_path);
1016 }
1017 key = keynames;
1018 while (*key) {
1019 read = GetPrivateProfileStringW(L"commands", key, NULL, value, MSGSIZE,
1020 config_path);
1021 if (read == MSGSIZE - 1) {
1022 debug(L"read_commands: %ls: not enough space for %ls\n",
1023 config_path, key);
1024 }
1025 cmdp = skip_whitespace(value);
1026 if (*cmdp) {
1027 cp = find_command(key);
1028 if (cp == NULL)
1029 add_command(key, value);
1030 else
1031 update_command(cp, key, value);
1032 }
1033 key += wcslen(key) + 1;
1034 }
1035 }
1036
1037 static void read_commands(void)
1038 {
1039 if (launcher_ini_path[0])
1040 read_config_file(launcher_ini_path);
1041 if (appdata_ini_path[0])
1042 read_config_file(appdata_ini_path);
1043 }
1044
1045 static BOOL
1046 parse_shebang(wchar_t * shebang_line, int nchars, wchar_t ** command,
1047 wchar_t ** suffix, BOOL *search)
1048 {
1049 BOOL rc = FALSE;
1050 SHEBANG * vpp;
1051 size_t plen;
1052 wchar_t * p;
1053 wchar_t zapped;
1054 wchar_t * endp = shebang_line + nchars - 1;
1055 COMMAND * cp;
1056 wchar_t * skipped;
1057
1058 *command = NULL; /* failure return */
1059 *suffix = NULL;
1060 *search = FALSE;
1061
1062 if ((*shebang_line++ == L'#') && (*shebang_line++ == L'!')) {
1063 shebang_line = skip_whitespace(shebang_line);
1064 if (*shebang_line) {
1065 *command = shebang_line;
1066 for (vpp = builtin_virtual_paths; vpp->shebang; ++vpp) {
1067 plen = wcslen(vpp->shebang);
1068 if (wcsncmp(shebang_line, vpp->shebang, plen) == 0) {
1069 rc = TRUE;
1070 *search = vpp->search;
1071 /* We can do this because all builtin commands contain
1072 * "python".
1073 */
1074 *command = wcsstr(shebang_line, L"python");
1075 break;
1076 }
1077 }
1078 if (vpp->shebang == NULL) {
1079 /*
1080 * Not found in builtins - look in customized commands.
1081 *
1082 * We can't permanently modify the shebang line in case
1083 * it's not a customized command, but we can temporarily
1084 * stick a NUL after the command while searching for it,
1085 * then put back the char we zapped.
1086 */
1087 #if defined(SKIP_PREFIX)
1088 skipped = skip_prefix(shebang_line);
1089 #else
1090 skipped = shebang_line;
1091 #endif
1092 p = wcspbrk(skipped, L" \t\r\n");
1093 if (p != NULL) {
1094 zapped = *p;
1095 *p = L'\0';
1096 }
1097 cp = find_command(skipped);
1098 if (p != NULL)
1099 *p = zapped;
1100 if (cp != NULL) {
1101 *command = cp->value;
1102 if (p != NULL)
1103 *suffix = skip_whitespace(p);
1104 }
1105 }
1106 /* remove trailing whitespace */
1107 while ((endp > shebang_line) && isspace(*endp))
1108 --endp;
1109 if (endp > shebang_line)
1110 endp[1] = L'\0';
1111 }
1112 }
1113 return rc;
1114 }
1115
1116 /* #define CP_UTF8 65001 defined in winnls.h */
1117 #define CP_UTF16LE 1200
1118 #define CP_UTF16BE 1201
1119 #define CP_UTF32LE 12000
1120 #define CP_UTF32BE 12001
1121
1122 typedef struct {
1123 int length;
1124 char sequence[4];
1125 UINT code_page;
1126 } BOM;
1127
1128 /*
1129 * Strictly, we don't need to handle UTF-16 and UTF-32, since Python itself
1130 * doesn't. Never mind, one day it might - there's no harm leaving it in.
1131 */
1132 static BOM BOMs[] = {
1133 { 3, { 0xEF, 0xBB, 0xBF }, CP_UTF8 }, /* UTF-8 - keep first */
1134 /* Test UTF-32LE before UTF-16LE since UTF-16LE BOM is a prefix
1135 * of UTF-32LE BOM. */
1136 { 4, { 0xFF, 0xFE, 0x00, 0x00 }, CP_UTF32LE }, /* UTF-32LE */
1137 { 4, { 0x00, 0x00, 0xFE, 0xFF }, CP_UTF32BE }, /* UTF-32BE */
1138 { 2, { 0xFF, 0xFE }, CP_UTF16LE }, /* UTF-16LE */
1139 { 2, { 0xFE, 0xFF }, CP_UTF16BE }, /* UTF-16BE */
1140 { 0 } /* sentinel */
1141 };
1142
1143 static BOM *
1144 find_BOM(char * buffer)
1145 {
1146 /*
1147 * Look for a BOM in the input and return a pointer to the
1148 * corresponding structure, or NULL if not found.
1149 */
1150 BOM * result = NULL;
1151 BOM *bom;
1152
1153 for (bom = BOMs; bom->length; bom++) {
1154 if (strncmp(bom->sequence, buffer, bom->length) == 0) {
1155 result = bom;
1156 break;
1157 }
1158 }
1159 return result;
1160 }
1161
1162 static char *
1163 find_terminator(char * buffer, int len, BOM *bom)
1164 {
1165 char * result = NULL;
1166 char * end = buffer + len;
1167 char * p;
1168 char c;
1169 int cp;
1170
1171 for (p = buffer; p < end; p++) {
1172 c = *p;
1173 if (c == '\r') {
1174 result = p;
1175 break;
1176 }
1177 if (c == '\n') {
1178 result = p;
1179 break;
1180 }
1181 }
1182 if (result != NULL) {
1183 cp = bom->code_page;
1184
1185 /* adjustments to include all bytes of the char */
1186 /* no adjustment needed for UTF-8 or big endian */
1187 if (cp == CP_UTF16LE)
1188 ++result;
1189 else if (cp == CP_UTF32LE)
1190 result += 3;
1191 ++result; /* point just past terminator */
1192 }
1193 return result;
1194 }
1195
1196 static BOOL
1197 validate_version(wchar_t * p)
1198 {
1199 /*
1200 Version information should start with the major version,
1201 Optionally followed by a period and a minor version,
1202 Optionally followed by a minus and one of 32 or 64.
1203 Valid examples:
1204 2
1205 3
1206 2.7
1207 3.6
1208 2.7-32
1209 The intent is to add to the valid patterns:
1210 3.10
1211 3-32
1212 3.6-64
1213 3-64
1214 */
1215 BOOL result = (p != NULL); /* Default to False if null pointer. */
1216
1217 result = result && iswdigit(*p); /* Result = False if first string element is not a digit. */
1218
1219 while (result && iswdigit(*p)) /* Require a major version */
1220 ++p; /* Skip all leading digit(s) */
1221 if (result && (*p == L'.')) /* Allow . for major minor separator.*/
1222 {
1223 result = iswdigit(*++p); /* Must be at least one digit */
1224 while (result && iswdigit(*++p)) ; /* Skip any more Digits */
1225 }
1226 if (result && (*p == L'-')) { /* Allow - for Bits Separator */
1227 switch(*++p){
1228 case L'3': /* 3 is OK */
1229 result = (*++p == L'2') && !*++p; /* only if followed by 2 and ended.*/
1230 break;
1231 case L'6': /* 6 is OK */
1232 result = (*++p == L'4') && !*++p; /* only if followed by 4 and ended.*/
1233 break;
1234 default:
1235 result = FALSE;
1236 break;
1237 }
1238 }
1239 result = result && !*p; /* Must have reached EOS */
1240 return result;
1241
1242 }
1243
1244 typedef struct {
1245 unsigned short min;
1246 unsigned short max;
1247 wchar_t version[MAX_VERSION_SIZE];
1248 } PYC_MAGIC;
1249
1250 static PYC_MAGIC magic_values[] = {
1251 { 50823, 50823, L"2.0" },
1252 { 60202, 60202, L"2.1" },
1253 { 60717, 60717, L"2.2" },
1254 { 62011, 62021, L"2.3" },
1255 { 62041, 62061, L"2.4" },
1256 { 62071, 62131, L"2.5" },
1257 { 62151, 62161, L"2.6" },
1258 { 62171, 62211, L"2.7" },
1259 { 3000, 3131, L"3.0" },
1260 { 3141, 3151, L"3.1" },
1261 { 3160, 3180, L"3.2" },
1262 { 3190, 3230, L"3.3" },
1263 { 3250, 3310, L"3.4" },
1264 { 3320, 3351, L"3.5" },
1265 { 3360, 3379, L"3.6" },
1266 { 3390, 3399, L"3.7" },
1267 { 3400, 3419, L"3.8" },
1268 { 3420, 3429, L"3.9" },
1269 { 3430, 3449, L"3.10" },
1270 /* Allow 50 magic numbers per version from here on */
1271 { 3450, 3499, L"3.11" },
1272 { 3500, 3549, L"3.12" },
1273 { 0 }
1274 };
1275
1276 static INSTALLED_PYTHON *
1277 find_by_magic(unsigned short magic)
1278 {
1279 INSTALLED_PYTHON * result = NULL;
1280 PYC_MAGIC * mp;
1281
1282 for (mp = magic_values; mp->min; mp++) {
1283 if ((magic >= mp->min) && (magic <= mp->max)) {
1284 result = locate_python(mp->version, FALSE);
1285 if (result != NULL)
1286 break;
1287 }
1288 }
1289 return result;
1290 }
1291
1292 static void
1293 maybe_handle_shebang(wchar_t ** argv, wchar_t * cmdline)
1294 {
1295 /*
1296 * Look for a shebang line in the first argument. If found
1297 * and we spawn a child process, this never returns. If it
1298 * does return then we process the args "normally".
1299 *
1300 * argv[0] might be a filename with a shebang.
1301 */
1302 FILE * fp;
1303 errno_t rc = _wfopen_s(&fp, *argv, L"rb");
1304 char buffer[BUFSIZE];
1305 wchar_t shebang_line[BUFSIZE + 1];
1306 size_t read;
1307 char *p;
1308 char * start;
1309 char * shebang_alias = (char *) shebang_line;
1310 BOM* bom;
1311 int i, j, nchars = 0;
1312 int header_len;
1313 BOOL is_virt;
1314 BOOL search;
1315 wchar_t * command;
1316 wchar_t * suffix;
1317 COMMAND *cmd = NULL;
1318 INSTALLED_PYTHON * ip;
1319
1320 if (rc == 0) {
1321 read = fread(buffer, sizeof(char), BUFSIZE, fp);
1322 debug(L"maybe_handle_shebang: read %zd bytes\n", read);
1323 fclose(fp);
1324
1325 if ((read >= 4) && (buffer[3] == '\n') && (buffer[2] == '\r')) {
1326 ip = find_by_magic((((unsigned char)buffer[1]) << 8 |
1327 (unsigned char)buffer[0]) & 0xFFFF);
1328 if (ip != NULL) {
1329 debug(L"script file is compiled against Python %ls\n",
1330 ip->version);
1331 invoke_child(ip->executable, NULL, cmdline);
1332 }
1333 }
1334 /* Look for BOM */
1335 bom = find_BOM(buffer);
1336 if (bom == NULL) {
1337 start = buffer;
1338 debug(L"maybe_handle_shebang: BOM not found, using UTF-8\n");
1339 bom = BOMs; /* points to UTF-8 entry - the default */
1340 }
1341 else {
1342 debug(L"maybe_handle_shebang: BOM found, code page %u\n",
1343 bom->code_page);
1344 start = &buffer[bom->length];
1345 }
1346 p = find_terminator(start, BUFSIZE, bom);
1347 /*
1348 * If no CR or LF was found in the heading,
1349 * we assume it's not a shebang file.
1350 */
1351 if (p == NULL) {
1352 debug(L"maybe_handle_shebang: No line terminator found\n");
1353 }
1354 else {
1355 /*
1356 * Found line terminator - parse the shebang.
1357 *
1358 * Strictly, we don't need to handle UTF-16 anf UTF-32,
1359 * since Python itself doesn't.
1360 * Never mind, one day it might.
1361 */
1362 header_len = (int) (p - start);
1363 switch(bom->code_page) {
1364 case CP_UTF8:
1365 nchars = MultiByteToWideChar(bom->code_page,
1366 0,
1367 start, header_len, shebang_line,
1368 BUFSIZE);
1369 break;
1370 case CP_UTF16BE:
1371 if (header_len % 2 != 0) {
1372 debug(L"maybe_handle_shebang: UTF-16BE, but an odd number \
1373 of bytes: %d\n", header_len);
1374 /* nchars = 0; Not needed - initialised to 0. */
1375 }
1376 else {
1377 for (i = header_len; i > 0; i -= 2) {
1378 shebang_alias[i - 1] = start[i - 2];
1379 shebang_alias[i - 2] = start[i - 1];
1380 }
1381 nchars = header_len / sizeof(wchar_t);
1382 }
1383 break;
1384 case CP_UTF16LE:
1385 if ((header_len % 2) != 0) {
1386 debug(L"UTF-16LE, but an odd number of bytes: %d\n",
1387 header_len);
1388 /* nchars = 0; Not needed - initialised to 0. */
1389 }
1390 else {
1391 /* no actual conversion needed. */
1392 memcpy(shebang_line, start, header_len);
1393 nchars = header_len / sizeof(wchar_t);
1394 }
1395 break;
1396 case CP_UTF32BE:
1397 if (header_len % 4 != 0) {
1398 debug(L"UTF-32BE, but not divisible by 4: %d\n",
1399 header_len);
1400 /* nchars = 0; Not needed - initialised to 0. */
1401 }
1402 else {
1403 for (i = header_len, j = header_len / 2; i > 0; i -= 4,
1404 j -= 2) {
1405 shebang_alias[j - 1] = start[i - 2];
1406 shebang_alias[j - 2] = start[i - 1];
1407 }
1408 nchars = header_len / sizeof(wchar_t);
1409 }
1410 break;
1411 case CP_UTF32LE:
1412 if (header_len % 4 != 0) {
1413 debug(L"UTF-32LE, but not divisible by 4: %d\n",
1414 header_len);
1415 /* nchars = 0; Not needed - initialised to 0. */
1416 }
1417 else {
1418 for (i = header_len, j = header_len / 2; i > 0; i -= 4,
1419 j -= 2) {
1420 shebang_alias[j - 1] = start[i - 3];
1421 shebang_alias[j - 2] = start[i - 4];
1422 }
1423 nchars = header_len / sizeof(wchar_t);
1424 }
1425 break;
1426 }
1427 if (nchars > 0) {
1428 shebang_line[--nchars] = L'\0';
1429 is_virt = parse_shebang(shebang_line, nchars, &command,
1430 &suffix, &search);
1431 if (command != NULL) {
1432 debug(L"parse_shebang: found command: %ls\n", command);
1433 if (!is_virt) {
1434 invoke_child(command, suffix, cmdline);
1435 }
1436 else {
1437 suffix = wcschr(command, L' ');
1438 if (suffix != NULL) {
1439 *suffix++ = L'\0';
1440 suffix = skip_whitespace(suffix);
1441 }
1442 if (wcsncmp(command, L"python", 6))
1443 error(RC_BAD_VIRTUAL_PATH, L"Unknown virtual \
1444 path '%ls'", command);
1445 command += 6; /* skip past "python" */
1446 if (search && ((*command == L'\0') || isspace(*command))) {
1447 /* Command is eligible for path search, and there
1448 * is no version specification.
1449 */
1450 debug(L"searching PATH for python executable\n");
1451 cmd = find_on_path(PYTHON_EXECUTABLE);
1452 debug(L"Python on path: %ls\n", cmd ? cmd->value : L"<not found>");
1453 if (cmd) {
1454 debug(L"located python on PATH: %ls\n", cmd->value);
1455 invoke_child(cmd->value, suffix, cmdline);
1456 /* Exit here, as we have found the command */
1457 return;
1458 }
1459 /* FALL THROUGH: No python found on PATH, so fall
1460 * back to locating the correct installed python.
1461 */
1462 }
1463 if (*command && !validate_version(command))
1464 error(RC_BAD_VIRTUAL_PATH, L"Invalid version \
1465 specification: '%ls'.\nIn the first line of the script, 'python' needs to be \
1466 followed by a valid version specifier.\nPlease check the documentation.",
1467 command);
1468 /* TODO could call validate_version(command) */
1469 ip = locate_python(command, TRUE);
1470 if (ip == NULL) {
1471 error(RC_NO_PYTHON, L"Requested Python version \
1472 (%ls) is not installed", command);
1473 }
1474 else {
1475 invoke_child(ip->executable, suffix, cmdline);
1476 }
1477 }
1478 }
1479 }
1480 }
1481 }
1482 }
1483
1484 static wchar_t *
1485 skip_me(wchar_t * cmdline)
1486 {
1487 BOOL quoted;
1488 wchar_t c;
1489 wchar_t * result = cmdline;
1490
1491 quoted = cmdline[0] == L'\"';
1492 if (!quoted)
1493 c = L' ';
1494 else {
1495 c = L'\"';
1496 ++result;
1497 }
1498 result = wcschr(result, c);
1499 if (result == NULL) /* when, for example, just exe name on command line */
1500 result = L"";
1501 else {
1502 ++result; /* skip past space or closing quote */
1503 result = skip_whitespace(result);
1504 }
1505 return result;
1506 }
1507
1508 static DWORD version_high = 0;
1509 static DWORD version_low = 0;
1510
1511 static void
1512 get_version_info(wchar_t * version_text, size_t size)
1513 {
1514 WORD maj, min, rel, bld;
1515
1516 if (!version_high && !version_low)
1517 wcsncpy_s(version_text, size, L"0.1", _TRUNCATE); /* fallback */
1518 else {
1519 maj = HIWORD(version_high);
1520 min = LOWORD(version_high);
1521 rel = HIWORD(version_low);
1522 bld = LOWORD(version_low);
1523 _snwprintf_s(version_text, size, _TRUNCATE, L"%d.%d.%d.%d", maj,
1524 min, rel, bld);
1525 }
1526 }
1527
1528 static void
1529 show_help_text(wchar_t ** argv)
1530 {
1531 wchar_t version_text [MAX_PATH];
1532 #if defined(_M_X64)
1533 BOOL canDo64bit = TRUE;
1534 #else
1535 /* If we are a 32bit process on a 64bit Windows, first hit the 64bit keys. */
1536 BOOL canDo64bit = FALSE;
1537 IsWow64Process(GetCurrentProcess(), &canDo64bit);
1538 #endif
1539
1540 get_version_info(version_text, MAX_PATH);
1541 fwprintf(stdout, L"\
1542 Python Launcher for Windows Version %ls\n\n", version_text);
1543 fwprintf(stdout, L"\
1544 usage:\n\
1545 %ls [launcher-args] [python-args] [script [script-args]]\n\n", argv[0]);
1546 fputws(L"\
1547 Launcher arguments:\n\n\
1548 -2 : Launch the latest Python 2.x version\n\
1549 -3 : Launch the latest Python 3.x version\n\
1550 -X.Y : Launch the specified Python version\n", stdout);
1551 if (canDo64bit) {
1552 fputws(L"\
1553 The above all default to 64 bit if a matching 64 bit python is present.\n\
1554 -X.Y-32: Launch the specified 32bit Python version\n\
1555 -X-32 : Launch the latest 32bit Python X version\n\
1556 -X.Y-64: Launch the specified 64bit Python version\n\
1557 -X-64 : Launch the latest 64bit Python X version", stdout);
1558 }
1559 fputws(L"\n-0 --list : List the available pythons", stdout);
1560 fputws(L"\n-0p --list-paths : List with paths", stdout);
1561 fputws(L"\n\n If no script is specified the specified interpreter is opened.", stdout);
1562 fputws(L"\nIf an exact version is not given, using the latest version can be overridden by", stdout);
1563 fputws(L"\nany of the following, (in priority order):", stdout);
1564 fputws(L"\n An active virtual environment", stdout);
1565 fputws(L"\n A shebang line in the script (if present)", stdout);
1566 fputws(L"\n With -2 or -3 flag a matching PY_PYTHON2 or PY_PYTHON3 Environment variable", stdout);
1567 fputws(L"\n A PY_PYTHON Environment variable", stdout);
1568 fputws(L"\n From [defaults] in py.ini in your %LOCALAPPDATA%\\py.ini", stdout);
1569 fputws(L"\n From [defaults] in py.ini beside py.exe (use `where py` to locate)", stdout);
1570 fputws(L"\n\nThe following help text is from Python:\n\n", stdout);
1571 fflush(stdout);
1572 }
1573
1574 static BOOL
1575 show_python_list(wchar_t ** argv)
1576 {
1577 /*
1578 * Display options -0
1579 */
1580 INSTALLED_PYTHON * result = NULL;
1581 INSTALLED_PYTHON * ip = installed_pythons; /* List of installed pythons */
1582 INSTALLED_PYTHON * defpy = locate_python(L"", FALSE);
1583 size_t i = 0;
1584 wchar_t *p = argv[1];
1585 wchar_t *ver_fmt = L"-%ls-%d";
1586 wchar_t *fmt = L"\n %ls";
1587 wchar_t *defind = L" *"; /* Default indicator */
1588
1589 /*
1590 * Output informational messages to stderr to keep output
1591 * clean for use in pipes, etc.
1592 */
1593 fwprintf(stderr,
1594 L"Installed Pythons found by %s Launcher for Windows", argv[0]);
1595 if (!_wcsicmp(p, L"-0p") || !_wcsicmp(p, L"--list-paths"))
1596 fmt = L"\n %-15ls%ls"; /* include path */
1597
1598 if (num_installed_pythons == 0) /* We have somehow got here without searching for pythons */
1599 locate_all_pythons(); /* Find them, Populates installed_pythons */
1600
1601 if (num_installed_pythons == 0) /* No pythons found */
1602 fwprintf(stderr, L"\nNo Installed Pythons Found!");
1603 else
1604 {
1605 for (i = 0; i < num_installed_pythons; i++, ip++) {
1606 wchar_t version[BUFSIZ];
1607 if (wcscmp(ip->version, L"venv") == 0) {
1608 wcscpy_s(version, BUFSIZ, L"(venv)");
1609 }
1610 else {
1611 swprintf_s(version, BUFSIZ, ver_fmt, ip->version, ip->bits);
1612 }
1613
1614 if (ip->exe_display[0]) {
1615 fwprintf(stdout, fmt, version, ip->exe_display);
1616 }
1617 else {
1618 fwprintf(stdout, fmt, version, ip->executable);
1619 }
1620 /* If there is a default indicate it */
1621 if (defpy == ip)
1622 fwprintf(stderr, defind);
1623 }
1624 }
1625
1626 if ((defpy == NULL) && (num_installed_pythons > 0))
1627 /* We have pythons but none is the default */
1628 fwprintf(stderr, L"\n\nCan't find a Default Python.\n\n");
1629 else
1630 fwprintf(stderr, L"\n\n"); /* End with a blank line */
1631 return FALSE; /* If this has been called we cannot continue */
1632 }
1633
1634 #if defined(VENV_REDIRECT)
1635
1636 static int
1637 find_home_value(const char *buffer, const char **start, DWORD *length)
1638 {
1639 for (const char *s = strstr(buffer, "home"); s; s = strstr(s + 1, "\nhome")) {
1640 if (*s == '\n') {
1641 ++s;
1642 }
1643 for (int i = 4; i > 0 && *s; --i, ++s);
1644
1645 while (*s && iswspace(*s)) {
1646 ++s;
1647 }
1648 if (*s != L'=') {
1649 continue;
1650 }
1651
1652 do {
1653 ++s;
1654 } while (*s && iswspace(*s));
1655
1656 *start = s;
1657 char *nl = strchr(s, '\n');
1658 if (nl) {
1659 *length = (DWORD)((ptrdiff_t)nl - (ptrdiff_t)s);
1660 } else {
1661 *length = (DWORD)strlen(s);
1662 }
1663 return 1;
1664 }
1665 return 0;
1666 }
1667 #endif
1668
1669 static wchar_t *
1670 wcsdup_pad(const wchar_t *s, int padding, int *newlen)
1671 {
1672 size_t len = wcslen(s);
1673 len += 1 + padding;
1674 wchar_t *r = (wchar_t *)malloc(len * sizeof(wchar_t));
1675 if (!r) {
1676 return NULL;
1677 }
1678 if (wcscpy_s(r, len, s)) {
1679 free(r);
1680 return NULL;
1681 }
1682 *newlen = len < MAXINT ? (int)len : MAXINT;
1683 return r;
1684 }
1685
1686 static wchar_t *
1687 get_process_name(void)
1688 {
1689 DWORD bufferLen = MAX_PATH;
1690 DWORD len = bufferLen;
1691 wchar_t *r = NULL;
1692
1693 while (!r) {
1694 r = (wchar_t *)malloc(bufferLen * sizeof(wchar_t));
1695 if (!r) {
1696 error(RC_NO_MEMORY, L"out of memory");
1697 return NULL;
1698 }
1699 len = GetModuleFileNameW(NULL, r, bufferLen);
1700 if (len == 0) {
1701 free(r);
1702 error(0, L"Failed to get module name");
1703 return NULL;
1704 } else if (len == bufferLen &&
1705 GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
1706 free(r);
1707 r = NULL;
1708 bufferLen *= 2;
1709 }
1710 }
1711
1712 return r;
1713 }
1714
1715 static int
1716 process(int argc, wchar_t ** argv)
1717 {
1718 wchar_t * wp;
1719 wchar_t * command;
1720 wchar_t * executable;
1721 wchar_t * p;
1722 wchar_t * argv0;
1723 int rc = 0;
1724 INSTALLED_PYTHON * ip;
1725 BOOL valid;
1726 DWORD size, attrs;
1727 wchar_t message[MSGSIZE];
1728 void * version_data;
1729 VS_FIXEDFILEINFO * file_info;
1730 UINT block_size;
1731 #if defined(VENV_REDIRECT)
1732 wchar_t * venv_cfg_path;
1733 int newlen;
1734 #elif defined(SCRIPT_WRAPPER)
1735 wchar_t * newcommand;
1736 wchar_t * av[2];
1737 int newlen;
1738 HRESULT hr;
1739 int index;
1740 #else
1741 HRESULT hr;
1742 int index;
1743 #endif
1744
1745 setvbuf(stderr, (char *)NULL, _IONBF, 0);
1746 wp = get_env(L"PYLAUNCH_DEBUG");
1747 if ((wp != NULL) && (*wp != L'\0'))
1748 log_fp = stderr;
1749
1750 #if defined(_M_X64)
1751 debug(L"launcher build: 64bit\n");
1752 #else
1753 debug(L"launcher build: 32bit\n");
1754 #endif
1755 #if defined(_WINDOWS)
1756 debug(L"launcher executable: Windows\n");
1757 #else
1758 debug(L"launcher executable: Console\n");
1759 #endif
1760 #if !defined(VENV_REDIRECT)
1761 /* Get the local appdata folder (non-roaming) */
1762 hr = SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA,
1763 NULL, 0, appdata_ini_path);
1764 if (hr != S_OK) {
1765 debug(L"SHGetFolderPath failed: %X\n", hr);
1766 appdata_ini_path[0] = L'\0';
1767 }
1768 else {
1769 wcsncat_s(appdata_ini_path, MAX_PATH, L"\\py.ini", _TRUNCATE);
1770 attrs = GetFileAttributesW(appdata_ini_path);
1771 if (attrs == INVALID_FILE_ATTRIBUTES) {
1772 debug(L"File '%ls' non-existent\n", appdata_ini_path);
1773 appdata_ini_path[0] = L'\0';
1774 } else {
1775 debug(L"Using local configuration file '%ls'\n", appdata_ini_path);
1776 }
1777 }
1778 #endif
1779 argv0 = get_process_name();
1780 size = GetFileVersionInfoSizeW(argv0, &size);
1781 if (size == 0) {
1782 winerror(GetLastError(), message, MSGSIZE);
1783 debug(L"GetFileVersionInfoSize failed: %ls\n", message);
1784 }
1785 else {
1786 version_data = malloc(size);
1787 if (version_data) {
1788 valid = GetFileVersionInfoW(argv0, 0, size,
1789 version_data);
1790 if (!valid)
1791 debug(L"GetFileVersionInfo failed: %X\n", GetLastError());
1792 else {
1793 valid = VerQueryValueW(version_data, L"\\",
1794 (LPVOID *) &file_info, &block_size);
1795 if (!valid)
1796 debug(L"VerQueryValue failed: %X\n", GetLastError());
1797 else {
1798 version_high = file_info->dwFileVersionMS;
1799 version_low = file_info->dwFileVersionLS;
1800 }
1801 }
1802 free(version_data);
1803 }
1804 }
1805
1806 #if defined(VENV_REDIRECT)
1807 /* Allocate some extra space for new filenames */
1808 venv_cfg_path = wcsdup_pad(argv0, 32, &newlen);
1809 if (!venv_cfg_path) {
1810 error(RC_NO_MEMORY, L"Failed to copy module name");
1811 }
1812 p = wcsrchr(venv_cfg_path, L'\\');
1813
1814 if (p == NULL) {
1815 error(RC_NO_VENV_CFG, L"No pyvenv.cfg file");
1816 }
1817 p[0] = L'\0';
1818 wcscat_s(venv_cfg_path, newlen, L"\\pyvenv.cfg");
1819 attrs = GetFileAttributesW(venv_cfg_path);
1820 if (attrs == INVALID_FILE_ATTRIBUTES) {
1821 debug(L"File '%ls' non-existent\n", venv_cfg_path);
1822 p[0] = '\0';
1823 p = wcsrchr(venv_cfg_path, L'\\');
1824 if (p != NULL) {
1825 p[0] = '\0';
1826 wcscat_s(venv_cfg_path, newlen, L"\\pyvenv.cfg");
1827 attrs = GetFileAttributesW(venv_cfg_path);
1828 if (attrs == INVALID_FILE_ATTRIBUTES) {
1829 debug(L"File '%ls' non-existent\n", venv_cfg_path);
1830 error(RC_NO_VENV_CFG, L"No pyvenv.cfg file");
1831 }
1832 }
1833 }
1834 debug(L"Using venv configuration file '%ls'\n", venv_cfg_path);
1835 #else
1836 /* Allocate some extra space for new filenames */
1837 if (wcscpy_s(launcher_ini_path, MAX_PATH, argv0)) {
1838 error(RC_NO_MEMORY, L"Failed to copy module name");
1839 }
1840 p = wcsrchr(launcher_ini_path, L'\\');
1841
1842 if (p == NULL) {
1843 debug(L"GetModuleFileNameW returned value has no backslash: %ls\n",
1844 launcher_ini_path);
1845 launcher_ini_path[0] = L'\0';
1846 }
1847 else {
1848 p[0] = L'\0';
1849 wcscat_s(launcher_ini_path, MAX_PATH, L"\\py.ini");
1850 attrs = GetFileAttributesW(launcher_ini_path);
1851 if (attrs == INVALID_FILE_ATTRIBUTES) {
1852 debug(L"File '%ls' non-existent\n", launcher_ini_path);
1853 launcher_ini_path[0] = L'\0';
1854 } else {
1855 debug(L"Using global configuration file '%ls'\n", launcher_ini_path);
1856 }
1857 }
1858 #endif
1859
1860 command = skip_me(GetCommandLineW());
1861 debug(L"Called with command line: %ls\n", command);
1862
1863 #if !defined(VENV_REDIRECT)
1864 /* bpo-35811: The __PYVENV_LAUNCHER__ variable is used to
1865 * override sys.executable and locate the original prefix path.
1866 * However, if it is silently inherited by a non-venv Python
1867 * process, that process will believe it is running in the venv
1868 * still. This is the only place where *we* can clear it (that is,
1869 * when py.exe is being used to launch Python), so we do.
1870 */
1871 SetEnvironmentVariableW(L"__PYVENV_LAUNCHER__", NULL);
1872 #endif
1873
1874 #if defined(SCRIPT_WRAPPER)
1875 /* The launcher is being used in "script wrapper" mode.
1876 * There should therefore be a Python script named <exename>-script.py in
1877 * the same directory as the launcher executable.
1878 * Put the script name into argv as the first (script name) argument.
1879 */
1880
1881 /* Get the wrapped script name - if the script is not present, this will
1882 * terminate the program with an error.
1883 */
1884 locate_wrapped_script();
1885
1886 /* Add the wrapped script to the start of command */
1887 newlen = wcslen(wrapped_script_path) + wcslen(command) + 2; /* ' ' + NUL */
1888 newcommand = malloc(sizeof(wchar_t) * newlen);
1889 if (!newcommand) {
1890 error(RC_NO_MEMORY, L"Could not allocate new command line");
1891 }
1892 else {
1893 wcscpy_s(newcommand, newlen, wrapped_script_path);
1894 wcscat_s(newcommand, newlen, L" ");
1895 wcscat_s(newcommand, newlen, command);
1896 debug(L"Running wrapped script with command line '%ls'\n", newcommand);
1897 read_commands();
1898 av[0] = wrapped_script_path;
1899 av[1] = NULL;
1900 maybe_handle_shebang(av, newcommand);
1901 /* Returns if no shebang line - pass to default processing */
1902 command = newcommand;
1903 valid = FALSE;
1904 }
1905 #elif defined(VENV_REDIRECT)
1906 {
1907 FILE *f;
1908 char buffer[4096]; /* 4KB should be enough for anybody */
1909 char *start;
1910 DWORD len, cch, cch_actual;
1911 size_t cb;
1912 if (_wfopen_s(&f, venv_cfg_path, L"r")) {
1913 error(RC_BAD_VENV_CFG, L"Cannot read '%ls'", venv_cfg_path);
1914 }
1915 cb = fread_s(buffer, sizeof(buffer), sizeof(buffer[0]),
1916 sizeof(buffer) / sizeof(buffer[0]), f);
1917 fclose(f);
1918
1919 if (!find_home_value(buffer, &start, &len)) {
1920 error(RC_BAD_VENV_CFG, L"Cannot find home in '%ls'",
1921 venv_cfg_path);
1922 }
1923
1924 cch = MultiByteToWideChar(CP_UTF8, 0, start, len, NULL, 0);
1925 if (!cch) {
1926 error(0, L"Cannot determine memory for home path");
1927 }
1928 cch += (DWORD)wcslen(PYTHON_EXECUTABLE) + 4; /* include sep, null and quotes */
1929 executable = (wchar_t *)malloc(cch * sizeof(wchar_t));
1930 if (executable == NULL) {
1931 error(RC_NO_MEMORY, L"A memory allocation failed");
1932 }
1933 /* start with a quote - we'll skip this ahead, but want it for the final string */
1934 executable[0] = L'"';
1935 cch_actual = MultiByteToWideChar(CP_UTF8, 0, start, len, &executable[1], cch - 1);
1936 if (!cch_actual) {
1937 error(RC_BAD_VENV_CFG, L"Cannot decode home path in '%ls'",
1938 venv_cfg_path);
1939 }
1940 cch_actual += 1; /* account for the first quote */
1941 executable[cch_actual] = L'\0';
1942 if (executable[cch_actual - 1] != L'\\') {
1943 executable[cch_actual++] = L'\\';
1944 executable[cch_actual] = L'\0';
1945 }
1946 if (wcscat_s(&executable[1], cch - 1, PYTHON_EXECUTABLE)) {
1947 error(RC_BAD_VENV_CFG, L"Cannot create executable path from '%ls'",
1948 venv_cfg_path);
1949 }
1950 /* there's no trailing quote, so we only have to skip one character for the test */
1951 if (GetFileAttributesW(&executable[1]) == INVALID_FILE_ATTRIBUTES) {
1952 error(RC_NO_PYTHON, L"No Python at '%ls'", executable);
1953 }
1954 /* now append the final quote */
1955 wcscat_s(executable, cch, L"\"");
1956 /* smuggle our original path through */
1957 if (!SetEnvironmentVariableW(L"__PYVENV_LAUNCHER__", argv0)) {
1958 error(0, L"Failed to set launcher environment");
1959 }
1960 valid = 1;
1961 }
1962 #else
1963 if (argc <= 1) {
1964 valid = FALSE;
1965 p = NULL;
1966 }
1967 else {
1968 p = argv[1];
1969 if ((argc == 2) && // list version args
1970 (!wcsncmp(p, L"-0", wcslen(L"-0")) ||
1971 !wcsncmp(p, L"--list", wcslen(L"--list"))))
1972 {
1973 show_python_list(argv);
1974 return rc;
1975 }
1976 valid = valid && (*p == L'-') && validate_version(&p[1]);
1977 if (valid) {
1978 ip = locate_python(&p[1], FALSE);
1979 if (ip == NULL)
1980 {
1981 fwprintf(stdout, \
1982 L"Python %ls not found!\n", &p[1]);
1983 valid = show_python_list(argv);
1984 error(RC_NO_PYTHON, L"Requested Python version (%ls) not \
1985 installed, use -0 for available pythons", &p[1]);
1986 }
1987 executable = ip->executable;
1988 command += wcslen(p);
1989 command = skip_whitespace(command);
1990 }
1991 else {
1992 for (index = 1; index < argc; ++index) {
1993 if (*argv[index] != L'-')
1994 break;
1995 }
1996 if (index < argc) {
1997 read_commands();
1998 maybe_handle_shebang(&argv[index], command);
1999 }
2000 }
2001 }
2002 #endif
2003
2004 if (!valid) {
2005 if ((argc == 2) && (!_wcsicmp(p, L"-h") || !_wcsicmp(p, L"--help")))
2006 show_help_text(argv);
2007 if ((argc == 2) &&
2008 (!_wcsicmp(p, L"-0") || !_wcsicmp(p, L"--list") ||
2009 !_wcsicmp(p, L"-0p") || !_wcsicmp(p, L"--list-paths")))
2010 {
2011 executable = NULL; /* Info call only */
2012 }
2013 else {
2014 /* look for the default Python */
2015 ip = locate_python(L"", FALSE);
2016 if (ip == NULL)
2017 error(RC_NO_PYTHON, L"Can't find a default Python.");
2018 executable = ip->executable;
2019 }
2020 }
2021 if (executable != NULL)
2022 invoke_child(executable, NULL, command);
2023 else
2024 rc = RC_NO_PYTHON;
2025 return rc;
2026 }
2027
2028 #if defined(_WINDOWS)
2029
2030 int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
2031 LPWSTR lpstrCmd, int nShow)
2032 {
2033 return process(__argc, __wargv);
2034 }
2035
2036 #else
2037
2038 int cdecl wmain(int argc, wchar_t ** argv)
2039 {
2040 return process(argc, argv);
2041 }
2042
2043 #endif