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 *
skip_whitespace(wchar_t * p)58 skip_whitespace(wchar_t * p)
59 {
60 while (*p && isspace(*p))
61 ++p;
62 return p;
63 }
64
65 static void
debug(wchar_t * format,...)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
winerror(int rc,wchar_t * message,int size)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
error(int rc,wchar_t * format,...)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 */
get_env(wchar_t * key)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 *
find_existing_python(const wchar_t * path)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 *
find_existing_python2(int bits,const wchar_t * version)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
_locate_pythons_for_key(HKEY root,LPCWSTR subkey,REGSAM flags,int bits,int display_name_only)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
compare_pythons(const void * p1,const void * p2)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
locate_pythons_for_key(HKEY root,REGSAM flags)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
locate_store_pythons()452 locate_store_pythons()
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
locate_venv_python()469 locate_venv_python()
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
locate_all_pythons()498 locate_all_pythons()
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 *
find_python_by_version(wchar_t const * wanted_ver)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 *
get_configured_value(wchar_t * key)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 *
locate_python(wchar_t * wanted_ver,BOOL from_shebang)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
locate_wrapped_script()697 locate_wrapped_script()
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
safe_duplicate_handle(HANDLE in,HANDLE * pout)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
ctrl_c_handler(DWORD code)750 ctrl_c_handler(DWORD code)
751 {
752 return TRUE; /* We just ignore all control events. */
753 }
754
755 static void
run_child(wchar_t * cmdline)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 and
774 https://bitbucket.org/vinay.sajip/pylauncher/issue/20/busy-cursor-for-a-long-time-when-running
775 */
776 MSG msg;
777
778 PostMessage(0, 0, 0, 0);
779 GetMessage(&msg, 0, 0, 0);
780 #endif
781
782 debug(L"run_child: about to run '%ls'\n", cmdline);
783 job = CreateJobObject(NULL, NULL);
784 ok = QueryInformationJobObject(job, JobObjectExtendedLimitInformation,
785 &info, sizeof(info), &rc);
786 if (!ok || (rc != sizeof(info)) || !job)
787 error(RC_CREATE_PROCESS, L"Job information querying failed");
788 info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE |
789 JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK;
790 ok = SetInformationJobObject(job, JobObjectExtendedLimitInformation, &info,
791 sizeof(info));
792 if (!ok)
793 error(RC_CREATE_PROCESS, L"Job information setting failed");
794 memset(&si, 0, sizeof(si));
795 GetStartupInfoW(&si);
796 ok = safe_duplicate_handle(GetStdHandle(STD_INPUT_HANDLE), &si.hStdInput);
797 if (!ok)
798 error(RC_NO_STD_HANDLES, L"stdin duplication failed");
799 ok = safe_duplicate_handle(GetStdHandle(STD_OUTPUT_HANDLE), &si.hStdOutput);
800 if (!ok)
801 error(RC_NO_STD_HANDLES, L"stdout duplication failed");
802 ok = safe_duplicate_handle(GetStdHandle(STD_ERROR_HANDLE), &si.hStdError);
803 if (!ok)
804 error(RC_NO_STD_HANDLES, L"stderr duplication failed");
805
806 ok = SetConsoleCtrlHandler(ctrl_c_handler, TRUE);
807 if (!ok)
808 error(RC_CREATE_PROCESS, L"control handler setting failed");
809
810 si.dwFlags = STARTF_USESTDHANDLES;
811 ok = CreateProcessW(NULL, cmdline, NULL, NULL, TRUE,
812 0, NULL, NULL, &si, &pi);
813 if (!ok)
814 error(RC_CREATE_PROCESS, L"Unable to create process using '%ls'", cmdline);
815 AssignProcessToJobObject(job, pi.hProcess);
816 CloseHandle(pi.hThread);
817 WaitForSingleObjectEx(pi.hProcess, INFINITE, FALSE);
818 ok = GetExitCodeProcess(pi.hProcess, &rc);
819 if (!ok)
820 error(RC_CREATE_PROCESS, L"Failed to get exit code of process");
821 debug(L"child process exit code: %d\n", rc);
822 exit(rc);
823 }
824
825 static void
invoke_child(wchar_t * executable,wchar_t * suffix,wchar_t * cmdline)826 invoke_child(wchar_t * executable, wchar_t * suffix, wchar_t * cmdline)
827 {
828 wchar_t * child_command;
829 size_t child_command_size;
830 BOOL no_suffix = (suffix == NULL) || (*suffix == L'\0');
831 BOOL no_cmdline = (*cmdline == L'\0');
832
833 if (no_suffix && no_cmdline)
834 run_child(executable);
835 else {
836 if (no_suffix) {
837 /* add 2 for space separator + terminating NUL. */
838 child_command_size = wcslen(executable) + wcslen(cmdline) + 2;
839 }
840 else {
841 /* add 3 for 2 space separators + terminating NUL. */
842 child_command_size = wcslen(executable) + wcslen(suffix) +
843 wcslen(cmdline) + 3;
844 }
845 child_command = calloc(child_command_size, sizeof(wchar_t));
846 if (child_command == NULL)
847 error(RC_CREATE_PROCESS, L"unable to allocate %zd bytes for child command.",
848 child_command_size);
849 if (no_suffix)
850 _snwprintf_s(child_command, child_command_size,
851 child_command_size - 1, L"%ls %ls",
852 executable, cmdline);
853 else
854 _snwprintf_s(child_command, child_command_size,
855 child_command_size - 1, L"%ls %ls %ls",
856 executable, suffix, cmdline);
857 run_child(child_command);
858 free(child_command);
859 }
860 }
861
862 typedef struct {
863 wchar_t *shebang;
864 BOOL search;
865 } SHEBANG;
866
867 static SHEBANG builtin_virtual_paths [] = {
868 { L"/usr/bin/env python", TRUE },
869 { L"/usr/bin/python", FALSE },
870 { L"/usr/local/bin/python", FALSE },
871 { L"python", FALSE },
872 { NULL, FALSE },
873 };
874
875 /* For now, a static array of commands. */
876
877 #define MAX_COMMANDS 100
878
879 typedef struct {
880 wchar_t key[MAX_PATH];
881 wchar_t value[MSGSIZE];
882 } COMMAND;
883
884 static COMMAND commands[MAX_COMMANDS];
885 static int num_commands = 0;
886
887 #if defined(SKIP_PREFIX)
888
889 static wchar_t * builtin_prefixes [] = {
890 /* These must be in an order that the longest matches should be found,
891 * i.e. if the prefix is "/usr/bin/env ", it should match that entry
892 * *before* matching "/usr/bin/".
893 */
894 L"/usr/bin/env ",
895 L"/usr/bin/",
896 L"/usr/local/bin/",
897 NULL
898 };
899
skip_prefix(wchar_t * name)900 static wchar_t * skip_prefix(wchar_t * name)
901 {
902 wchar_t ** pp = builtin_prefixes;
903 wchar_t * result = name;
904 wchar_t * p;
905 size_t n;
906
907 for (; p = *pp; pp++) {
908 n = wcslen(p);
909 if (_wcsnicmp(p, name, n) == 0) {
910 result += n; /* skip the prefix */
911 if (p[n - 1] == L' ') /* No empty strings in table, so n > 1 */
912 result = skip_whitespace(result);
913 break;
914 }
915 }
916 return result;
917 }
918
919 #endif
920
921 #if defined(SEARCH_PATH)
922
923 static COMMAND path_command;
924
find_on_path(wchar_t * name)925 static COMMAND * find_on_path(wchar_t * name)
926 {
927 wchar_t * pathext;
928 size_t varsize;
929 wchar_t * context = NULL;
930 wchar_t * extension;
931 COMMAND * result = NULL;
932 DWORD len;
933 errno_t rc;
934
935 wcscpy_s(path_command.key, MAX_PATH, name);
936 if (wcschr(name, L'.') != NULL) {
937 /* assume it has an extension. */
938 len = SearchPathW(NULL, name, NULL, MSGSIZE, path_command.value, NULL);
939 if (len) {
940 result = &path_command;
941 }
942 }
943 else {
944 /* No extension - search using registered extensions. */
945 rc = _wdupenv_s(&pathext, &varsize, L"PATHEXT");
946 if (rc == 0) {
947 extension = wcstok_s(pathext, L";", &context);
948 while (extension) {
949 len = SearchPathW(NULL, name, extension, MSGSIZE, path_command.value, NULL);
950 if (len) {
951 result = &path_command;
952 break;
953 }
954 extension = wcstok_s(NULL, L";", &context);
955 }
956 free(pathext);
957 }
958 }
959 return result;
960 }
961
962 #endif
963
find_command(wchar_t * name)964 static COMMAND * find_command(wchar_t * name)
965 {
966 COMMAND * result = NULL;
967 COMMAND * cp = commands;
968 int i;
969
970 for (i = 0; i < num_commands; i++, cp++) {
971 if (_wcsicmp(cp->key, name) == 0) {
972 result = cp;
973 break;
974 }
975 }
976 #if defined(SEARCH_PATH)
977 if (result == NULL)
978 result = find_on_path(name);
979 #endif
980 return result;
981 }
982
983 static void
update_command(COMMAND * cp,wchar_t * name,wchar_t * cmdline)984 update_command(COMMAND * cp, wchar_t * name, wchar_t * cmdline)
985 {
986 wcsncpy_s(cp->key, MAX_PATH, name, _TRUNCATE);
987 wcsncpy_s(cp->value, MSGSIZE, cmdline, _TRUNCATE);
988 }
989
990 static void
add_command(wchar_t * name,wchar_t * cmdline)991 add_command(wchar_t * name, wchar_t * cmdline)
992 {
993 if (num_commands >= MAX_COMMANDS) {
994 debug(L"can't add %ls = '%ls': no room\n", name, cmdline);
995 }
996 else {
997 COMMAND * cp = &commands[num_commands++];
998
999 update_command(cp, name, cmdline);
1000 }
1001 }
1002
1003 static void
read_config_file(wchar_t * config_path)1004 read_config_file(wchar_t * config_path)
1005 {
1006 wchar_t keynames[MSGSIZE];
1007 wchar_t value[MSGSIZE];
1008 DWORD read;
1009 wchar_t * key;
1010 COMMAND * cp;
1011 wchar_t * cmdp;
1012
1013 read = GetPrivateProfileStringW(L"commands", NULL, NULL, keynames, MSGSIZE,
1014 config_path);
1015 if (read == MSGSIZE - 1) {
1016 debug(L"read_commands: %ls: not enough space for names\n", config_path);
1017 }
1018 key = keynames;
1019 while (*key) {
1020 read = GetPrivateProfileStringW(L"commands", key, NULL, value, MSGSIZE,
1021 config_path);
1022 if (read == MSGSIZE - 1) {
1023 debug(L"read_commands: %ls: not enough space for %ls\n",
1024 config_path, key);
1025 }
1026 cmdp = skip_whitespace(value);
1027 if (*cmdp) {
1028 cp = find_command(key);
1029 if (cp == NULL)
1030 add_command(key, value);
1031 else
1032 update_command(cp, key, value);
1033 }
1034 key += wcslen(key) + 1;
1035 }
1036 }
1037
read_commands()1038 static void read_commands()
1039 {
1040 if (launcher_ini_path[0])
1041 read_config_file(launcher_ini_path);
1042 if (appdata_ini_path[0])
1043 read_config_file(appdata_ini_path);
1044 }
1045
1046 static BOOL
parse_shebang(wchar_t * shebang_line,int nchars,wchar_t ** command,wchar_t ** suffix,BOOL * search)1047 parse_shebang(wchar_t * shebang_line, int nchars, wchar_t ** command,
1048 wchar_t ** suffix, BOOL *search)
1049 {
1050 BOOL rc = FALSE;
1051 SHEBANG * vpp;
1052 size_t plen;
1053 wchar_t * p;
1054 wchar_t zapped;
1055 wchar_t * endp = shebang_line + nchars - 1;
1056 COMMAND * cp;
1057 wchar_t * skipped;
1058
1059 *command = NULL; /* failure return */
1060 *suffix = NULL;
1061 *search = FALSE;
1062
1063 if ((*shebang_line++ == L'#') && (*shebang_line++ == L'!')) {
1064 shebang_line = skip_whitespace(shebang_line);
1065 if (*shebang_line) {
1066 *command = shebang_line;
1067 for (vpp = builtin_virtual_paths; vpp->shebang; ++vpp) {
1068 plen = wcslen(vpp->shebang);
1069 if (wcsncmp(shebang_line, vpp->shebang, plen) == 0) {
1070 rc = TRUE;
1071 *search = vpp->search;
1072 /* We can do this because all builtin commands contain
1073 * "python".
1074 */
1075 *command = wcsstr(shebang_line, L"python");
1076 break;
1077 }
1078 }
1079 if (vpp->shebang == NULL) {
1080 /*
1081 * Not found in builtins - look in customized commands.
1082 *
1083 * We can't permanently modify the shebang line in case
1084 * it's not a customized command, but we can temporarily
1085 * stick a NUL after the command while searching for it,
1086 * then put back the char we zapped.
1087 */
1088 #if defined(SKIP_PREFIX)
1089 skipped = skip_prefix(shebang_line);
1090 #else
1091 skipped = shebang_line;
1092 #endif
1093 p = wcspbrk(skipped, L" \t\r\n");
1094 if (p != NULL) {
1095 zapped = *p;
1096 *p = L'\0';
1097 }
1098 cp = find_command(skipped);
1099 if (p != NULL)
1100 *p = zapped;
1101 if (cp != NULL) {
1102 *command = cp->value;
1103 if (p != NULL)
1104 *suffix = skip_whitespace(p);
1105 }
1106 }
1107 /* remove trailing whitespace */
1108 while ((endp > shebang_line) && isspace(*endp))
1109 --endp;
1110 if (endp > shebang_line)
1111 endp[1] = L'\0';
1112 }
1113 }
1114 return rc;
1115 }
1116
1117 /* #define CP_UTF8 65001 defined in winnls.h */
1118 #define CP_UTF16LE 1200
1119 #define CP_UTF16BE 1201
1120 #define CP_UTF32LE 12000
1121 #define CP_UTF32BE 12001
1122
1123 typedef struct {
1124 int length;
1125 char sequence[4];
1126 UINT code_page;
1127 } BOM;
1128
1129 /*
1130 * Strictly, we don't need to handle UTF-16 and UTF-32, since Python itself
1131 * doesn't. Never mind, one day it might - there's no harm leaving it in.
1132 */
1133 static BOM BOMs[] = {
1134 { 3, { 0xEF, 0xBB, 0xBF }, CP_UTF8 }, /* UTF-8 - keep first */
1135 /* Test UTF-32LE before UTF-16LE since UTF-16LE BOM is a prefix
1136 * of UTF-32LE BOM. */
1137 { 4, { 0xFF, 0xFE, 0x00, 0x00 }, CP_UTF32LE }, /* UTF-32LE */
1138 { 4, { 0x00, 0x00, 0xFE, 0xFF }, CP_UTF32BE }, /* UTF-32BE */
1139 { 2, { 0xFF, 0xFE }, CP_UTF16LE }, /* UTF-16LE */
1140 { 2, { 0xFE, 0xFF }, CP_UTF16BE }, /* UTF-16BE */
1141 { 0 } /* sentinel */
1142 };
1143
1144 static BOM *
find_BOM(char * buffer)1145 find_BOM(char * buffer)
1146 {
1147 /*
1148 * Look for a BOM in the input and return a pointer to the
1149 * corresponding structure, or NULL if not found.
1150 */
1151 BOM * result = NULL;
1152 BOM *bom;
1153
1154 for (bom = BOMs; bom->length; bom++) {
1155 if (strncmp(bom->sequence, buffer, bom->length) == 0) {
1156 result = bom;
1157 break;
1158 }
1159 }
1160 return result;
1161 }
1162
1163 static char *
find_terminator(char * buffer,int len,BOM * bom)1164 find_terminator(char * buffer, int len, BOM *bom)
1165 {
1166 char * result = NULL;
1167 char * end = buffer + len;
1168 char * p;
1169 char c;
1170 int cp;
1171
1172 for (p = buffer; p < end; p++) {
1173 c = *p;
1174 if (c == '\r') {
1175 result = p;
1176 break;
1177 }
1178 if (c == '\n') {
1179 result = p;
1180 break;
1181 }
1182 }
1183 if (result != NULL) {
1184 cp = bom->code_page;
1185
1186 /* adjustments to include all bytes of the char */
1187 /* no adjustment needed for UTF-8 or big endian */
1188 if (cp == CP_UTF16LE)
1189 ++result;
1190 else if (cp == CP_UTF32LE)
1191 result += 3;
1192 ++result; /* point just past terminator */
1193 }
1194 return result;
1195 }
1196
1197 static BOOL
validate_version(wchar_t * p)1198 validate_version(wchar_t * p)
1199 {
1200 /*
1201 Version information should start with the major version,
1202 Optionally followed by a period and a minor version,
1203 Optionally followed by a minus and one of 32 or 64.
1204 Valid examples:
1205 2
1206 3
1207 2.7
1208 3.6
1209 2.7-32
1210 The intent is to add to the valid patterns:
1211 3.10
1212 3-32
1213 3.6-64
1214 3-64
1215 */
1216 BOOL result = (p != NULL); /* Default to False if null pointer. */
1217
1218 result = result && iswdigit(*p); /* Result = False if first string element is not a digit. */
1219
1220 while (result && iswdigit(*p)) /* Require a major version */
1221 ++p; /* Skip all leading digit(s) */
1222 if (result && (*p == L'.')) /* Allow . for major minor separator.*/
1223 {
1224 result = iswdigit(*++p); /* Must be at least one digit */
1225 while (result && iswdigit(*++p)) ; /* Skip any more Digits */
1226 }
1227 if (result && (*p == L'-')) { /* Allow - for Bits Separator */
1228 switch(*++p){
1229 case L'3': /* 3 is OK */
1230 result = (*++p == L'2') && !*++p; /* only if followed by 2 and ended.*/
1231 break;
1232 case L'6': /* 6 is OK */
1233 result = (*++p == L'4') && !*++p; /* only if followed by 4 and ended.*/
1234 break;
1235 default:
1236 result = FALSE;
1237 break;
1238 }
1239 }
1240 result = result && !*p; /* Must have reached EOS */
1241 return result;
1242
1243 }
1244
1245 typedef struct {
1246 unsigned short min;
1247 unsigned short max;
1248 wchar_t version[MAX_VERSION_SIZE];
1249 } PYC_MAGIC;
1250
1251 static PYC_MAGIC magic_values[] = {
1252 { 50823, 50823, L"2.0" },
1253 { 60202, 60202, L"2.1" },
1254 { 60717, 60717, L"2.2" },
1255 { 62011, 62021, L"2.3" },
1256 { 62041, 62061, L"2.4" },
1257 { 62071, 62131, L"2.5" },
1258 { 62151, 62161, L"2.6" },
1259 { 62171, 62211, L"2.7" },
1260 { 3000, 3131, L"3.0" },
1261 { 3141, 3151, L"3.1" },
1262 { 3160, 3180, L"3.2" },
1263 { 3190, 3230, L"3.3" },
1264 { 3250, 3310, L"3.4" },
1265 { 3320, 3351, L"3.5" },
1266 { 3360, 3379, L"3.6" },
1267 { 3390, 3399, L"3.7" },
1268 { 3400, 3419, L"3.8" },
1269 { 3420, 3429, L"3.9" },
1270 { 3430, 3439, L"3.10" },
1271 { 0 }
1272 };
1273
1274 static INSTALLED_PYTHON *
find_by_magic(unsigned short magic)1275 find_by_magic(unsigned short magic)
1276 {
1277 INSTALLED_PYTHON * result = NULL;
1278 PYC_MAGIC * mp;
1279
1280 for (mp = magic_values; mp->min; mp++) {
1281 if ((magic >= mp->min) && (magic <= mp->max)) {
1282 result = locate_python(mp->version, FALSE);
1283 if (result != NULL)
1284 break;
1285 }
1286 }
1287 return result;
1288 }
1289
1290 static void
maybe_handle_shebang(wchar_t ** argv,wchar_t * cmdline)1291 maybe_handle_shebang(wchar_t ** argv, wchar_t * cmdline)
1292 {
1293 /*
1294 * Look for a shebang line in the first argument. If found
1295 * and we spawn a child process, this never returns. If it
1296 * does return then we process the args "normally".
1297 *
1298 * argv[0] might be a filename with a shebang.
1299 */
1300 FILE * fp;
1301 errno_t rc = _wfopen_s(&fp, *argv, L"rb");
1302 char buffer[BUFSIZE];
1303 wchar_t shebang_line[BUFSIZE + 1];
1304 size_t read;
1305 char *p;
1306 char * start;
1307 char * shebang_alias = (char *) shebang_line;
1308 BOM* bom;
1309 int i, j, nchars = 0;
1310 int header_len;
1311 BOOL is_virt;
1312 BOOL search;
1313 wchar_t * command;
1314 wchar_t * suffix;
1315 COMMAND *cmd = NULL;
1316 INSTALLED_PYTHON * ip;
1317
1318 if (rc == 0) {
1319 read = fread(buffer, sizeof(char), BUFSIZE, fp);
1320 debug(L"maybe_handle_shebang: read %zd bytes\n", read);
1321 fclose(fp);
1322
1323 if ((read >= 4) && (buffer[3] == '\n') && (buffer[2] == '\r')) {
1324 ip = find_by_magic((((unsigned char)buffer[1]) << 8 |
1325 (unsigned char)buffer[0]) & 0xFFFF);
1326 if (ip != NULL) {
1327 debug(L"script file is compiled against Python %ls\n",
1328 ip->version);
1329 invoke_child(ip->executable, NULL, cmdline);
1330 }
1331 }
1332 /* Look for BOM */
1333 bom = find_BOM(buffer);
1334 if (bom == NULL) {
1335 start = buffer;
1336 debug(L"maybe_handle_shebang: BOM not found, using UTF-8\n");
1337 bom = BOMs; /* points to UTF-8 entry - the default */
1338 }
1339 else {
1340 debug(L"maybe_handle_shebang: BOM found, code page %u\n",
1341 bom->code_page);
1342 start = &buffer[bom->length];
1343 }
1344 p = find_terminator(start, BUFSIZE, bom);
1345 /*
1346 * If no CR or LF was found in the heading,
1347 * we assume it's not a shebang file.
1348 */
1349 if (p == NULL) {
1350 debug(L"maybe_handle_shebang: No line terminator found\n");
1351 }
1352 else {
1353 /*
1354 * Found line terminator - parse the shebang.
1355 *
1356 * Strictly, we don't need to handle UTF-16 anf UTF-32,
1357 * since Python itself doesn't.
1358 * Never mind, one day it might.
1359 */
1360 header_len = (int) (p - start);
1361 switch(bom->code_page) {
1362 case CP_UTF8:
1363 nchars = MultiByteToWideChar(bom->code_page,
1364 0,
1365 start, header_len, shebang_line,
1366 BUFSIZE);
1367 break;
1368 case CP_UTF16BE:
1369 if (header_len % 2 != 0) {
1370 debug(L"maybe_handle_shebang: UTF-16BE, but an odd number \
1371 of bytes: %d\n", header_len);
1372 /* nchars = 0; Not needed - initialised to 0. */
1373 }
1374 else {
1375 for (i = header_len; i > 0; i -= 2) {
1376 shebang_alias[i - 1] = start[i - 2];
1377 shebang_alias[i - 2] = start[i - 1];
1378 }
1379 nchars = header_len / sizeof(wchar_t);
1380 }
1381 break;
1382 case CP_UTF16LE:
1383 if ((header_len % 2) != 0) {
1384 debug(L"UTF-16LE, but an odd number of bytes: %d\n",
1385 header_len);
1386 /* nchars = 0; Not needed - initialised to 0. */
1387 }
1388 else {
1389 /* no actual conversion needed. */
1390 memcpy(shebang_line, start, header_len);
1391 nchars = header_len / sizeof(wchar_t);
1392 }
1393 break;
1394 case CP_UTF32BE:
1395 if (header_len % 4 != 0) {
1396 debug(L"UTF-32BE, but not divisible by 4: %d\n",
1397 header_len);
1398 /* nchars = 0; Not needed - initialised to 0. */
1399 }
1400 else {
1401 for (i = header_len, j = header_len / 2; i > 0; i -= 4,
1402 j -= 2) {
1403 shebang_alias[j - 1] = start[i - 2];
1404 shebang_alias[j - 2] = start[i - 1];
1405 }
1406 nchars = header_len / sizeof(wchar_t);
1407 }
1408 break;
1409 case CP_UTF32LE:
1410 if (header_len % 4 != 0) {
1411 debug(L"UTF-32LE, but not divisible by 4: %d\n",
1412 header_len);
1413 /* nchars = 0; Not needed - initialised to 0. */
1414 }
1415 else {
1416 for (i = header_len, j = header_len / 2; i > 0; i -= 4,
1417 j -= 2) {
1418 shebang_alias[j - 1] = start[i - 3];
1419 shebang_alias[j - 2] = start[i - 4];
1420 }
1421 nchars = header_len / sizeof(wchar_t);
1422 }
1423 break;
1424 }
1425 if (nchars > 0) {
1426 shebang_line[--nchars] = L'\0';
1427 is_virt = parse_shebang(shebang_line, nchars, &command,
1428 &suffix, &search);
1429 if (command != NULL) {
1430 debug(L"parse_shebang: found command: %ls\n", command);
1431 if (!is_virt) {
1432 invoke_child(command, suffix, cmdline);
1433 }
1434 else {
1435 suffix = wcschr(command, L' ');
1436 if (suffix != NULL) {
1437 *suffix++ = L'\0';
1438 suffix = skip_whitespace(suffix);
1439 }
1440 if (wcsncmp(command, L"python", 6))
1441 error(RC_BAD_VIRTUAL_PATH, L"Unknown virtual \
1442 path '%ls'", command);
1443 command += 6; /* skip past "python" */
1444 if (search && ((*command == L'\0') || isspace(*command))) {
1445 /* Command is eligible for path search, and there
1446 * is no version specification.
1447 */
1448 debug(L"searching PATH for python executable\n");
1449 cmd = find_on_path(PYTHON_EXECUTABLE);
1450 debug(L"Python on path: %ls\n", cmd ? cmd->value : L"<not found>");
1451 if (cmd) {
1452 debug(L"located python on PATH: %ls\n", cmd->value);
1453 invoke_child(cmd->value, suffix, cmdline);
1454 /* Exit here, as we have found the command */
1455 return;
1456 }
1457 /* FALL THROUGH: No python found on PATH, so fall
1458 * back to locating the correct installed python.
1459 */
1460 }
1461 if (*command && !validate_version(command))
1462 error(RC_BAD_VIRTUAL_PATH, L"Invalid version \
1463 specification: '%ls'.\nIn the first line of the script, 'python' needs to be \
1464 followed by a valid version specifier.\nPlease check the documentation.",
1465 command);
1466 /* TODO could call validate_version(command) */
1467 ip = locate_python(command, TRUE);
1468 if (ip == NULL) {
1469 error(RC_NO_PYTHON, L"Requested Python version \
1470 (%ls) is not installed", command);
1471 }
1472 else {
1473 invoke_child(ip->executable, suffix, cmdline);
1474 }
1475 }
1476 }
1477 }
1478 }
1479 }
1480 }
1481
1482 static wchar_t *
skip_me(wchar_t * cmdline)1483 skip_me(wchar_t * cmdline)
1484 {
1485 BOOL quoted;
1486 wchar_t c;
1487 wchar_t * result = cmdline;
1488
1489 quoted = cmdline[0] == L'\"';
1490 if (!quoted)
1491 c = L' ';
1492 else {
1493 c = L'\"';
1494 ++result;
1495 }
1496 result = wcschr(result, c);
1497 if (result == NULL) /* when, for example, just exe name on command line */
1498 result = L"";
1499 else {
1500 ++result; /* skip past space or closing quote */
1501 result = skip_whitespace(result);
1502 }
1503 return result;
1504 }
1505
1506 static DWORD version_high = 0;
1507 static DWORD version_low = 0;
1508
1509 static void
get_version_info(wchar_t * version_text,size_t size)1510 get_version_info(wchar_t * version_text, size_t size)
1511 {
1512 WORD maj, min, rel, bld;
1513
1514 if (!version_high && !version_low)
1515 wcsncpy_s(version_text, size, L"0.1", _TRUNCATE); /* fallback */
1516 else {
1517 maj = HIWORD(version_high);
1518 min = LOWORD(version_high);
1519 rel = HIWORD(version_low);
1520 bld = LOWORD(version_low);
1521 _snwprintf_s(version_text, size, _TRUNCATE, L"%d.%d.%d.%d", maj,
1522 min, rel, bld);
1523 }
1524 }
1525
1526 static void
show_help_text(wchar_t ** argv)1527 show_help_text(wchar_t ** argv)
1528 {
1529 wchar_t version_text [MAX_PATH];
1530 #if defined(_M_X64)
1531 BOOL canDo64bit = TRUE;
1532 #else
1533 /* If we are a 32bit process on a 64bit Windows, first hit the 64bit keys. */
1534 BOOL canDo64bit = FALSE;
1535 IsWow64Process(GetCurrentProcess(), &canDo64bit);
1536 #endif
1537
1538 get_version_info(version_text, MAX_PATH);
1539 fwprintf(stdout, L"\
1540 Python Launcher for Windows Version %ls\n\n", version_text);
1541 fwprintf(stdout, L"\
1542 usage:\n\
1543 %ls [launcher-args] [python-args] [script [script-args]]\n\n", argv[0]);
1544 fputws(L"\
1545 Launcher arguments:\n\n\
1546 -2 : Launch the latest Python 2.x version\n\
1547 -3 : Launch the latest Python 3.x version\n\
1548 -X.Y : Launch the specified Python version\n", stdout);
1549 if (canDo64bit) {
1550 fputws(L"\
1551 The above all default to 64 bit if a matching 64 bit python is present.\n\
1552 -X.Y-32: Launch the specified 32bit Python version\n\
1553 -X-32 : Launch the latest 32bit Python X version\n\
1554 -X.Y-64: Launch the specified 64bit Python version\n\
1555 -X-64 : Launch the latest 64bit Python X version", stdout);
1556 }
1557 fputws(L"\n-0 --list : List the available pythons", stdout);
1558 fputws(L"\n-0p --list-paths : List with paths", stdout);
1559 fputws(L"\n\n If no script is specified the specified interpreter is opened.", stdout);
1560 fputws(L"\nIf an exact version is not given, using the latest version can be overridden by", stdout);
1561 fputws(L"\nany of the following, (in priority order):", stdout);
1562 fputws(L"\n An active virtual environment", stdout);
1563 fputws(L"\n A shebang line in the script (if present)", stdout);
1564 fputws(L"\n With -2 or -3 flag a matching PY_PYTHON2 or PY_PYTHON3 Environment variable", stdout);
1565 fputws(L"\n A PY_PYTHON Environment variable", stdout);
1566 fputws(L"\n From [defaults] in py.ini in your %LOCALAPPDATA%\\py.ini", stdout);
1567 fputws(L"\n From [defaults] in py.ini beside py.exe (use `where py` to locate)", stdout);
1568 fputws(L"\n\nThe following help text is from Python:\n\n", stdout);
1569 fflush(stdout);
1570 }
1571
1572 static BOOL
show_python_list(wchar_t ** argv)1573 show_python_list(wchar_t ** argv)
1574 {
1575 /*
1576 * Display options -0
1577 */
1578 INSTALLED_PYTHON * result = NULL;
1579 INSTALLED_PYTHON * ip = installed_pythons; /* List of installed pythons */
1580 INSTALLED_PYTHON * defpy = locate_python(L"", FALSE);
1581 size_t i = 0;
1582 wchar_t *p = argv[1];
1583 wchar_t *ver_fmt = L"-%ls-%d";
1584 wchar_t *fmt = L"\n %ls";
1585 wchar_t *defind = L" *"; /* Default indicator */
1586
1587 /*
1588 * Output informational messages to stderr to keep output
1589 * clean for use in pipes, etc.
1590 */
1591 fwprintf(stderr,
1592 L"Installed Pythons found by %s Launcher for Windows", argv[0]);
1593 if (!_wcsicmp(p, L"-0p") || !_wcsicmp(p, L"--list-paths"))
1594 fmt = L"\n %-15ls%ls"; /* include path */
1595
1596 if (num_installed_pythons == 0) /* We have somehow got here without searching for pythons */
1597 locate_all_pythons(); /* Find them, Populates installed_pythons */
1598
1599 if (num_installed_pythons == 0) /* No pythons found */
1600 fwprintf(stderr, L"\nNo Installed Pythons Found!");
1601 else
1602 {
1603 for (i = 0; i < num_installed_pythons; i++, ip++) {
1604 wchar_t version[BUFSIZ];
1605 if (wcscmp(ip->version, L"venv") == 0) {
1606 wcscpy_s(version, BUFSIZ, L"(venv)");
1607 }
1608 else {
1609 swprintf_s(version, BUFSIZ, ver_fmt, ip->version, ip->bits);
1610 }
1611
1612 if (ip->exe_display[0]) {
1613 fwprintf(stdout, fmt, version, ip->exe_display);
1614 }
1615 else {
1616 fwprintf(stdout, fmt, version, ip->executable);
1617 }
1618 /* If there is a default indicate it */
1619 if (defpy == ip)
1620 fwprintf(stderr, defind);
1621 }
1622 }
1623
1624 if ((defpy == NULL) && (num_installed_pythons > 0))
1625 /* We have pythons but none is the default */
1626 fwprintf(stderr, L"\n\nCan't find a Default Python.\n\n");
1627 else
1628 fwprintf(stderr, L"\n\n"); /* End with a blank line */
1629 return FALSE; /* If this has been called we cannot continue */
1630 }
1631
1632 #if defined(VENV_REDIRECT)
1633
1634 static int
find_home_value(const char * buffer,const char ** start,DWORD * length)1635 find_home_value(const char *buffer, const char **start, DWORD *length)
1636 {
1637 for (const char *s = strstr(buffer, "home"); s; s = strstr(s + 1, "\nhome")) {
1638 if (*s == '\n') {
1639 ++s;
1640 }
1641 for (int i = 4; i > 0 && *s; --i, ++s);
1642
1643 while (*s && iswspace(*s)) {
1644 ++s;
1645 }
1646 if (*s != L'=') {
1647 continue;
1648 }
1649
1650 do {
1651 ++s;
1652 } while (*s && iswspace(*s));
1653
1654 *start = s;
1655 char *nl = strchr(s, '\n');
1656 if (nl) {
1657 *length = (DWORD)((ptrdiff_t)nl - (ptrdiff_t)s);
1658 } else {
1659 *length = (DWORD)strlen(s);
1660 }
1661 return 1;
1662 }
1663 return 0;
1664 }
1665 #endif
1666
1667 static wchar_t *
wcsdup_pad(const wchar_t * s,int padding,int * newlen)1668 wcsdup_pad(const wchar_t *s, int padding, int *newlen)
1669 {
1670 size_t len = wcslen(s);
1671 len += 1 + padding;
1672 wchar_t *r = (wchar_t *)malloc(len * sizeof(wchar_t));
1673 if (!r) {
1674 return NULL;
1675 }
1676 if (wcscpy_s(r, len, s)) {
1677 free(r);
1678 return NULL;
1679 }
1680 *newlen = len < MAXINT ? (int)len : MAXINT;
1681 return r;
1682 }
1683
1684 static wchar_t *
get_process_name()1685 get_process_name()
1686 {
1687 DWORD bufferLen = MAX_PATH;
1688 DWORD len = bufferLen;
1689 wchar_t *r = NULL;
1690
1691 while (!r) {
1692 r = (wchar_t *)malloc(bufferLen * sizeof(wchar_t));
1693 if (!r) {
1694 error(RC_NO_MEMORY, L"out of memory");
1695 return NULL;
1696 }
1697 len = GetModuleFileNameW(NULL, r, bufferLen);
1698 if (len == 0) {
1699 free(r);
1700 error(0, L"Failed to get module name");
1701 return NULL;
1702 } else if (len == bufferLen &&
1703 GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
1704 free(r);
1705 r = NULL;
1706 bufferLen *= 2;
1707 }
1708 }
1709
1710 return r;
1711 }
1712
1713 static int
process(int argc,wchar_t ** argv)1714 process(int argc, wchar_t ** argv)
1715 {
1716 wchar_t * wp;
1717 wchar_t * command;
1718 wchar_t * executable;
1719 wchar_t * p;
1720 wchar_t * argv0;
1721 int rc = 0;
1722 INSTALLED_PYTHON * ip;
1723 BOOL valid;
1724 DWORD size, attrs;
1725 wchar_t message[MSGSIZE];
1726 void * version_data;
1727 VS_FIXEDFILEINFO * file_info;
1728 UINT block_size;
1729 #if defined(VENV_REDIRECT)
1730 wchar_t * venv_cfg_path;
1731 int newlen;
1732 #elif defined(SCRIPT_WRAPPER)
1733 wchar_t * newcommand;
1734 wchar_t * av[2];
1735 int newlen;
1736 HRESULT hr;
1737 int index;
1738 #else
1739 HRESULT hr;
1740 int index;
1741 #endif
1742
1743 setvbuf(stderr, (char *)NULL, _IONBF, 0);
1744 wp = get_env(L"PYLAUNCH_DEBUG");
1745 if ((wp != NULL) && (*wp != L'\0'))
1746 log_fp = stderr;
1747
1748 #if defined(_M_X64)
1749 debug(L"launcher build: 64bit\n");
1750 #else
1751 debug(L"launcher build: 32bit\n");
1752 #endif
1753 #if defined(_WINDOWS)
1754 debug(L"launcher executable: Windows\n");
1755 #else
1756 debug(L"launcher executable: Console\n");
1757 #endif
1758 #if !defined(VENV_REDIRECT)
1759 /* Get the local appdata folder (non-roaming) */
1760 hr = SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA,
1761 NULL, 0, appdata_ini_path);
1762 if (hr != S_OK) {
1763 debug(L"SHGetFolderPath failed: %X\n", hr);
1764 appdata_ini_path[0] = L'\0';
1765 }
1766 else {
1767 wcsncat_s(appdata_ini_path, MAX_PATH, L"\\py.ini", _TRUNCATE);
1768 attrs = GetFileAttributesW(appdata_ini_path);
1769 if (attrs == INVALID_FILE_ATTRIBUTES) {
1770 debug(L"File '%ls' non-existent\n", appdata_ini_path);
1771 appdata_ini_path[0] = L'\0';
1772 } else {
1773 debug(L"Using local configuration file '%ls'\n", appdata_ini_path);
1774 }
1775 }
1776 #endif
1777 argv0 = get_process_name();
1778 size = GetFileVersionInfoSizeW(argv0, &size);
1779 if (size == 0) {
1780 winerror(GetLastError(), message, MSGSIZE);
1781 debug(L"GetFileVersionInfoSize failed: %ls\n", message);
1782 }
1783 else {
1784 version_data = malloc(size);
1785 if (version_data) {
1786 valid = GetFileVersionInfoW(argv0, 0, size,
1787 version_data);
1788 if (!valid)
1789 debug(L"GetFileVersionInfo failed: %X\n", GetLastError());
1790 else {
1791 valid = VerQueryValueW(version_data, L"\\",
1792 (LPVOID *) &file_info, &block_size);
1793 if (!valid)
1794 debug(L"VerQueryValue failed: %X\n", GetLastError());
1795 else {
1796 version_high = file_info->dwFileVersionMS;
1797 version_low = file_info->dwFileVersionLS;
1798 }
1799 }
1800 free(version_data);
1801 }
1802 }
1803
1804 #if defined(VENV_REDIRECT)
1805 /* Allocate some extra space for new filenames */
1806 venv_cfg_path = wcsdup_pad(argv0, 32, &newlen);
1807 if (!venv_cfg_path) {
1808 error(RC_NO_MEMORY, L"Failed to copy module name");
1809 }
1810 p = wcsrchr(venv_cfg_path, L'\\');
1811
1812 if (p == NULL) {
1813 error(RC_NO_VENV_CFG, L"No pyvenv.cfg file");
1814 }
1815 p[0] = L'\0';
1816 wcscat_s(venv_cfg_path, newlen, L"\\pyvenv.cfg");
1817 attrs = GetFileAttributesW(venv_cfg_path);
1818 if (attrs == INVALID_FILE_ATTRIBUTES) {
1819 debug(L"File '%ls' non-existent\n", venv_cfg_path);
1820 p[0] = '\0';
1821 p = wcsrchr(venv_cfg_path, L'\\');
1822 if (p != NULL) {
1823 p[0] = '\0';
1824 wcscat_s(venv_cfg_path, newlen, L"\\pyvenv.cfg");
1825 attrs = GetFileAttributesW(venv_cfg_path);
1826 if (attrs == INVALID_FILE_ATTRIBUTES) {
1827 debug(L"File '%ls' non-existent\n", venv_cfg_path);
1828 error(RC_NO_VENV_CFG, L"No pyvenv.cfg file");
1829 }
1830 }
1831 }
1832 debug(L"Using venv configuration file '%ls'\n", venv_cfg_path);
1833 #else
1834 /* Allocate some extra space for new filenames */
1835 if (wcscpy_s(launcher_ini_path, MAX_PATH, argv0)) {
1836 error(RC_NO_MEMORY, L"Failed to copy module name");
1837 }
1838 p = wcsrchr(launcher_ini_path, L'\\');
1839
1840 if (p == NULL) {
1841 debug(L"GetModuleFileNameW returned value has no backslash: %ls\n",
1842 launcher_ini_path);
1843 launcher_ini_path[0] = L'\0';
1844 }
1845 else {
1846 p[0] = L'\0';
1847 wcscat_s(launcher_ini_path, MAX_PATH, L"\\py.ini");
1848 attrs = GetFileAttributesW(launcher_ini_path);
1849 if (attrs == INVALID_FILE_ATTRIBUTES) {
1850 debug(L"File '%ls' non-existent\n", launcher_ini_path);
1851 launcher_ini_path[0] = L'\0';
1852 } else {
1853 debug(L"Using global configuration file '%ls'\n", launcher_ini_path);
1854 }
1855 }
1856 #endif
1857
1858 command = skip_me(GetCommandLineW());
1859 debug(L"Called with command line: %ls\n", command);
1860
1861 #if !defined(VENV_REDIRECT)
1862 /* bpo-35811: The __PYVENV_LAUNCHER__ variable is used to
1863 * override sys.executable and locate the original prefix path.
1864 * However, if it is silently inherited by a non-venv Python
1865 * process, that process will believe it is running in the venv
1866 * still. This is the only place where *we* can clear it (that is,
1867 * when py.exe is being used to launch Python), so we do.
1868 */
1869 SetEnvironmentVariableW(L"__PYVENV_LAUNCHER__", NULL);
1870 #endif
1871
1872 #if defined(SCRIPT_WRAPPER)
1873 /* The launcher is being used in "script wrapper" mode.
1874 * There should therefore be a Python script named <exename>-script.py in
1875 * the same directory as the launcher executable.
1876 * Put the script name into argv as the first (script name) argument.
1877 */
1878
1879 /* Get the wrapped script name - if the script is not present, this will
1880 * terminate the program with an error.
1881 */
1882 locate_wrapped_script();
1883
1884 /* Add the wrapped script to the start of command */
1885 newlen = wcslen(wrapped_script_path) + wcslen(command) + 2; /* ' ' + NUL */
1886 newcommand = malloc(sizeof(wchar_t) * newlen);
1887 if (!newcommand) {
1888 error(RC_NO_MEMORY, L"Could not allocate new command line");
1889 }
1890 else {
1891 wcscpy_s(newcommand, newlen, wrapped_script_path);
1892 wcscat_s(newcommand, newlen, L" ");
1893 wcscat_s(newcommand, newlen, command);
1894 debug(L"Running wrapped script with command line '%ls'\n", newcommand);
1895 read_commands();
1896 av[0] = wrapped_script_path;
1897 av[1] = NULL;
1898 maybe_handle_shebang(av, newcommand);
1899 /* Returns if no shebang line - pass to default processing */
1900 command = newcommand;
1901 valid = FALSE;
1902 }
1903 #elif defined(VENV_REDIRECT)
1904 {
1905 FILE *f;
1906 char buffer[4096]; /* 4KB should be enough for anybody */
1907 char *start;
1908 DWORD len, cch, cch_actual;
1909 size_t cb;
1910 if (_wfopen_s(&f, venv_cfg_path, L"r")) {
1911 error(RC_BAD_VENV_CFG, L"Cannot read '%ls'", venv_cfg_path);
1912 }
1913 cb = fread_s(buffer, sizeof(buffer), sizeof(buffer[0]),
1914 sizeof(buffer) / sizeof(buffer[0]), f);
1915 fclose(f);
1916
1917 if (!find_home_value(buffer, &start, &len)) {
1918 error(RC_BAD_VENV_CFG, L"Cannot find home in '%ls'",
1919 venv_cfg_path);
1920 }
1921
1922 cch = MultiByteToWideChar(CP_UTF8, 0, start, len, NULL, 0);
1923 if (!cch) {
1924 error(0, L"Cannot determine memory for home path");
1925 }
1926 cch += (DWORD)wcslen(PYTHON_EXECUTABLE) + 1 + 1; /* include sep and null */
1927 executable = (wchar_t *)malloc(cch * sizeof(wchar_t));
1928 if (executable == NULL) {
1929 error(RC_NO_MEMORY, L"A memory allocation failed");
1930 }
1931 cch_actual = MultiByteToWideChar(CP_UTF8, 0, start, len, executable, cch);
1932 if (!cch_actual) {
1933 error(RC_BAD_VENV_CFG, L"Cannot decode home path in '%ls'",
1934 venv_cfg_path);
1935 }
1936 if (executable[cch_actual - 1] != L'\\') {
1937 executable[cch_actual++] = L'\\';
1938 executable[cch_actual] = L'\0';
1939 }
1940 if (wcscat_s(executable, cch, PYTHON_EXECUTABLE)) {
1941 error(RC_BAD_VENV_CFG, L"Cannot create executable path from '%ls'",
1942 venv_cfg_path);
1943 }
1944 if (GetFileAttributesW(executable) == INVALID_FILE_ATTRIBUTES) {
1945 error(RC_NO_PYTHON, L"No Python at '%ls'", executable);
1946 }
1947 if (!SetEnvironmentVariableW(L"__PYVENV_LAUNCHER__", argv0)) {
1948 error(0, L"Failed to set launcher environment");
1949 }
1950 valid = 1;
1951 }
1952 #else
1953 if (argc <= 1) {
1954 valid = FALSE;
1955 p = NULL;
1956 }
1957 else {
1958 p = argv[1];
1959 if ((argc == 2) && // list version args
1960 (!wcsncmp(p, L"-0", wcslen(L"-0")) ||
1961 !wcsncmp(p, L"--list", wcslen(L"--list"))))
1962 {
1963 show_python_list(argv);
1964 return rc;
1965 }
1966 valid = valid && (*p == L'-') && validate_version(&p[1]);
1967 if (valid) {
1968 ip = locate_python(&p[1], FALSE);
1969 if (ip == NULL)
1970 {
1971 fwprintf(stdout, \
1972 L"Python %ls not found!\n", &p[1]);
1973 valid = show_python_list(argv);
1974 error(RC_NO_PYTHON, L"Requested Python version (%ls) not \
1975 installed, use -0 for available pythons", &p[1]);
1976 }
1977 executable = ip->executable;
1978 command += wcslen(p);
1979 command = skip_whitespace(command);
1980 }
1981 else {
1982 for (index = 1; index < argc; ++index) {
1983 if (*argv[index] != L'-')
1984 break;
1985 }
1986 if (index < argc) {
1987 read_commands();
1988 maybe_handle_shebang(&argv[index], command);
1989 }
1990 }
1991 }
1992 #endif
1993
1994 if (!valid) {
1995 if ((argc == 2) && (!_wcsicmp(p, L"-h") || !_wcsicmp(p, L"--help")))
1996 show_help_text(argv);
1997 if ((argc == 2) &&
1998 (!_wcsicmp(p, L"-0") || !_wcsicmp(p, L"--list") ||
1999 !_wcsicmp(p, L"-0p") || !_wcsicmp(p, L"--list-paths")))
2000 {
2001 executable = NULL; /* Info call only */
2002 }
2003 else {
2004 /* look for the default Python */
2005 ip = locate_python(L"", FALSE);
2006 if (ip == NULL)
2007 error(RC_NO_PYTHON, L"Can't find a default Python.");
2008 executable = ip->executable;
2009 }
2010 }
2011 if (executable != NULL)
2012 invoke_child(executable, NULL, command);
2013 else
2014 rc = RC_NO_PYTHON;
2015 return rc;
2016 }
2017
2018 #if defined(_WINDOWS)
2019
wWinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPWSTR lpstrCmd,int nShow)2020 int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
2021 LPWSTR lpstrCmd, int nShow)
2022 {
2023 return process(__argc, __wargv);
2024 }
2025
2026 #else
2027
wmain(int argc,wchar_t ** argv)2028 int cdecl wmain(int argc, wchar_t ** argv)
2029 {
2030 return process(argc, argv);
2031 }
2032
2033 #endif
2034