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, attrs);
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 = wcscmp(ip2->version, ip1->version);
429
430 if (result == 0)
431 result = ip2->bits - ip1->bits; /* 64 before 32 */
432 return result;
433 }
434
435 static void
locate_pythons_for_key(HKEY root,REGSAM flags)436 locate_pythons_for_key(HKEY root, REGSAM flags)
437 {
438 _locate_pythons_for_key(root, CORE_PATH, flags, 0, FALSE);
439 }
440
441 static void
locate_store_pythons()442 locate_store_pythons()
443 {
444 #if defined(_M_X64)
445 /* 64bit process, so look in native registry */
446 _locate_pythons_for_key(HKEY_LOCAL_MACHINE, LOOKASIDE_PATH,
447 KEY_READ, 64, TRUE);
448 #else
449 /* 32bit process, so check that we're on 64bit OS */
450 BOOL f64 = FALSE;
451 if (IsWow64Process(GetCurrentProcess(), &f64) && f64) {
452 _locate_pythons_for_key(HKEY_LOCAL_MACHINE, LOOKASIDE_PATH,
453 KEY_READ | KEY_WOW64_64KEY, 64, TRUE);
454 }
455 #endif
456 }
457
458 static void
locate_venv_python()459 locate_venv_python()
460 {
461 static wchar_t venv_python[MAX_PATH];
462 INSTALLED_PYTHON * ip;
463 wchar_t *virtual_env = get_env(L"VIRTUAL_ENV");
464 DWORD attrs;
465
466 /* Check for VIRTUAL_ENV environment variable */
467 if (virtual_env == NULL || virtual_env[0] == L'\0') {
468 return;
469 }
470
471 /* Check for a python executable in the venv */
472 debug(L"Checking for Python executable in virtual env '%ls'\n", virtual_env);
473 _snwprintf_s(venv_python, MAX_PATH, _TRUNCATE,
474 L"%ls\\Scripts\\%ls", virtual_env, PYTHON_EXECUTABLE);
475 attrs = GetFileAttributesW(venv_python);
476 if (attrs == INVALID_FILE_ATTRIBUTES) {
477 debug(L"Python executable %ls missing from virtual env\n", venv_python);
478 return;
479 }
480
481 ip = &installed_pythons[num_installed_pythons++];
482 wcscpy_s(ip->executable, MAX_PATH, venv_python);
483 ip->bits = 0;
484 wcscpy_s(ip->version, MAX_VERSION_SIZE, L"venv");
485 }
486
487 static void
locate_all_pythons()488 locate_all_pythons()
489 {
490 /* venv Python is highest priority */
491 locate_venv_python();
492 #if defined(_M_X64)
493 /* If we are a 64bit process, first hit the 32bit keys. */
494 debug(L"locating Pythons in 32bit registry\n");
495 locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ | KEY_WOW64_32KEY);
496 locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ | KEY_WOW64_32KEY);
497 #else
498 /* If we are a 32bit process on a 64bit Windows, first hit the 64bit keys.*/
499 BOOL f64 = FALSE;
500 if (IsWow64Process(GetCurrentProcess(), &f64) && f64) {
501 debug(L"locating Pythons in 64bit registry\n");
502 locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ | KEY_WOW64_64KEY);
503 locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ | KEY_WOW64_64KEY);
504 }
505 #endif
506 /* now hit the "native" key for this process bittedness. */
507 debug(L"locating Pythons in native registry\n");
508 locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ);
509 locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ);
510 /* Store-installed Python is lowest priority */
511 locate_store_pythons();
512 qsort(installed_pythons, num_installed_pythons, sizeof(INSTALLED_PYTHON),
513 compare_pythons);
514 }
515
516 static INSTALLED_PYTHON *
find_python_by_version(wchar_t const * wanted_ver)517 find_python_by_version(wchar_t const * wanted_ver)
518 {
519 INSTALLED_PYTHON * result = NULL;
520 INSTALLED_PYTHON * ip = installed_pythons;
521 size_t i, n;
522 size_t wlen = wcslen(wanted_ver);
523 int bits = 0;
524
525 if (wcsstr(wanted_ver, L"-32")) {
526 bits = 32;
527 wlen -= wcslen(L"-32");
528 }
529 else if (wcsstr(wanted_ver, L"-64")) { /* Added option to select 64 bit explicitly */
530 bits = 64;
531 wlen -= wcslen(L"-64");
532 }
533 for (i = 0; i < num_installed_pythons; i++, ip++) {
534 n = wcslen(ip->version);
535 if (n > wlen)
536 n = wlen;
537 if ((wcsncmp(ip->version, wanted_ver, n) == 0) &&
538 /* bits == 0 => don't care */
539 ((bits == 0) || (ip->bits == bits))) {
540 result = ip;
541 break;
542 }
543 }
544 return result;
545 }
546
547
548 static wchar_t appdata_ini_path[MAX_PATH];
549 static wchar_t launcher_ini_path[MAX_PATH];
550
551 /*
552 * Get a value either from the environment or a configuration file.
553 * The key passed in will either be "python", "python2" or "python3".
554 */
555 static wchar_t *
get_configured_value(wchar_t * key)556 get_configured_value(wchar_t * key)
557 {
558 /*
559 * Note: this static value is used to return a configured value
560 * obtained either from the environment or configuration file.
561 * This should be OK since there wouldn't be any concurrent calls.
562 */
563 static wchar_t configured_value[MSGSIZE];
564 wchar_t * result = NULL;
565 wchar_t * found_in = L"environment";
566 DWORD size;
567
568 /* First, search the environment. */
569 _snwprintf_s(configured_value, MSGSIZE, _TRUNCATE, L"py_%ls", key);
570 result = get_env(configured_value);
571 if (result == NULL && appdata_ini_path[0]) {
572 /* Not in environment: check local configuration. */
573 size = GetPrivateProfileStringW(L"defaults", key, NULL,
574 configured_value, MSGSIZE,
575 appdata_ini_path);
576 if (size > 0) {
577 result = configured_value;
578 found_in = appdata_ini_path;
579 }
580 }
581 if (result == NULL && launcher_ini_path[0]) {
582 /* Not in environment or local: check global configuration. */
583 size = GetPrivateProfileStringW(L"defaults", key, NULL,
584 configured_value, MSGSIZE,
585 launcher_ini_path);
586 if (size > 0) {
587 result = configured_value;
588 found_in = launcher_ini_path;
589 }
590 }
591 if (result) {
592 debug(L"found configured value '%ls=%ls' in %ls\n",
593 key, result, found_in ? found_in : L"(unknown)");
594 } else {
595 debug(L"found no configured value for '%ls'\n", key);
596 }
597 return result;
598 }
599
600 static INSTALLED_PYTHON *
locate_python(wchar_t * wanted_ver,BOOL from_shebang)601 locate_python(wchar_t * wanted_ver, BOOL from_shebang)
602 {
603 static wchar_t config_key [] = { L"pythonX" };
604 static wchar_t * last_char = &config_key[sizeof(config_key) /
605 sizeof(wchar_t) - 2];
606 INSTALLED_PYTHON * result = NULL;
607 size_t n = wcslen(wanted_ver);
608 wchar_t * configured_value;
609
610 if (num_installed_pythons == 0)
611 locate_all_pythons();
612
613 if (n == 1) { /* just major version specified */
614 *last_char = *wanted_ver;
615 configured_value = get_configured_value(config_key);
616 if (configured_value != NULL)
617 wanted_ver = configured_value;
618 }
619 if (*wanted_ver) {
620 result = find_python_by_version(wanted_ver);
621 debug(L"search for Python version '%ls' found ", wanted_ver);
622 if (result) {
623 debug(L"'%ls'\n", result->executable);
624 } else {
625 debug(L"no interpreter\n");
626 }
627 }
628 else {
629 *last_char = L'\0'; /* look for an overall default */
630 result = find_python_by_version(L"venv");
631 if (result == NULL) {
632 configured_value = get_configured_value(config_key);
633 if (configured_value)
634 result = find_python_by_version(configured_value);
635 }
636 /* Not found a value yet - try by major version.
637 * If we're looking for an interpreter specified in a shebang line,
638 * we want to try Python 2 first, then Python 3 (for Unix and backward
639 * compatibility). If we're being called interactively, assume the user
640 * wants the latest version available, so try Python 3 first, then
641 * Python 2.
642 */
643 if (result == NULL)
644 result = find_python_by_version(from_shebang ? L"2" : L"3");
645 if (result == NULL)
646 result = find_python_by_version(from_shebang ? L"3" : L"2");
647 debug(L"search for default Python found ");
648 if (result) {
649 debug(L"version %ls at '%ls'\n",
650 result->version, result->executable);
651 } else {
652 debug(L"no interpreter\n");
653 }
654 }
655 return result;
656 }
657
658 #if defined(SCRIPT_WRAPPER)
659 /*
660 * Check for a script located alongside the executable
661 */
662
663 #if defined(_WINDOWS)
664 #define SCRIPT_SUFFIX L"-script.pyw"
665 #else
666 #define SCRIPT_SUFFIX L"-script.py"
667 #endif
668
669 static wchar_t wrapped_script_path[MAX_PATH];
670
671 /* Locate the script being wrapped.
672 *
673 * This code should store the name of the wrapped script in
674 * wrapped_script_path, or terminate the program with an error if there is no
675 * valid wrapped script file.
676 */
677 static void
locate_wrapped_script()678 locate_wrapped_script()
679 {
680 wchar_t * p;
681 size_t plen;
682 DWORD attrs;
683
684 plen = GetModuleFileNameW(NULL, wrapped_script_path, MAX_PATH);
685 p = wcsrchr(wrapped_script_path, L'.');
686 if (p == NULL) {
687 debug(L"GetModuleFileNameW returned value has no extension: %ls\n",
688 wrapped_script_path);
689 error(RC_NO_SCRIPT, L"Wrapper name '%ls' is not valid.", wrapped_script_path);
690 }
691
692 wcsncpy_s(p, MAX_PATH - (p - wrapped_script_path) + 1, SCRIPT_SUFFIX, _TRUNCATE);
693 attrs = GetFileAttributesW(wrapped_script_path);
694 if (attrs == INVALID_FILE_ATTRIBUTES) {
695 debug(L"File '%ls' non-existent\n", wrapped_script_path);
696 error(RC_NO_SCRIPT, L"Script file '%ls' is not present.", wrapped_script_path);
697 }
698
699 debug(L"Using wrapped script file '%ls'\n", wrapped_script_path);
700 }
701 #endif
702
703 /*
704 * Process creation code
705 */
706
707 static BOOL
safe_duplicate_handle(HANDLE in,HANDLE * pout)708 safe_duplicate_handle(HANDLE in, HANDLE * pout)
709 {
710 BOOL ok;
711 HANDLE process = GetCurrentProcess();
712 DWORD rc;
713
714 *pout = NULL;
715 ok = DuplicateHandle(process, in, process, pout, 0, TRUE,
716 DUPLICATE_SAME_ACCESS);
717 if (!ok) {
718 rc = GetLastError();
719 if (rc == ERROR_INVALID_HANDLE) {
720 debug(L"DuplicateHandle returned ERROR_INVALID_HANDLE\n");
721 ok = TRUE;
722 }
723 else {
724 debug(L"DuplicateHandle returned %d\n", rc);
725 }
726 }
727 return ok;
728 }
729
730 static BOOL WINAPI
ctrl_c_handler(DWORD code)731 ctrl_c_handler(DWORD code)
732 {
733 return TRUE; /* We just ignore all control events. */
734 }
735
736 static void
run_child(wchar_t * cmdline)737 run_child(wchar_t * cmdline)
738 {
739 HANDLE job;
740 JOBOBJECT_EXTENDED_LIMIT_INFORMATION info;
741 DWORD rc;
742 BOOL ok;
743 STARTUPINFOW si;
744 PROCESS_INFORMATION pi;
745
746 #if defined(_WINDOWS)
747 /*
748 When explorer launches a Windows (GUI) application, it displays
749 the "app starting" (the "pointer + hourglass") cursor for a number
750 of seconds, or until the app does something UI-ish (eg, creating a
751 window, or fetching a message). As this launcher doesn't do this
752 directly, that cursor remains even after the child process does these
753 things. We avoid that by doing a simple post+get message.
754 See http://bugs.python.org/issue17290 and
755 https://bitbucket.org/vinay.sajip/pylauncher/issue/20/busy-cursor-for-a-long-time-when-running
756 */
757 MSG msg;
758
759 PostMessage(0, 0, 0, 0);
760 GetMessage(&msg, 0, 0, 0);
761 #endif
762
763 debug(L"run_child: about to run '%ls'\n", cmdline);
764 job = CreateJobObject(NULL, NULL);
765 ok = QueryInformationJobObject(job, JobObjectExtendedLimitInformation,
766 &info, sizeof(info), &rc);
767 if (!ok || (rc != sizeof(info)) || !job)
768 error(RC_CREATE_PROCESS, L"Job information querying failed");
769 info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE |
770 JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK;
771 ok = SetInformationJobObject(job, JobObjectExtendedLimitInformation, &info,
772 sizeof(info));
773 if (!ok)
774 error(RC_CREATE_PROCESS, L"Job information setting failed");
775 memset(&si, 0, sizeof(si));
776 GetStartupInfoW(&si);
777 ok = safe_duplicate_handle(GetStdHandle(STD_INPUT_HANDLE), &si.hStdInput);
778 if (!ok)
779 error(RC_NO_STD_HANDLES, L"stdin duplication failed");
780 ok = safe_duplicate_handle(GetStdHandle(STD_OUTPUT_HANDLE), &si.hStdOutput);
781 if (!ok)
782 error(RC_NO_STD_HANDLES, L"stdout duplication failed");
783 ok = safe_duplicate_handle(GetStdHandle(STD_ERROR_HANDLE), &si.hStdError);
784 if (!ok)
785 error(RC_NO_STD_HANDLES, L"stderr duplication failed");
786
787 ok = SetConsoleCtrlHandler(ctrl_c_handler, TRUE);
788 if (!ok)
789 error(RC_CREATE_PROCESS, L"control handler setting failed");
790
791 si.dwFlags = STARTF_USESTDHANDLES;
792 ok = CreateProcessW(NULL, cmdline, NULL, NULL, TRUE,
793 0, NULL, NULL, &si, &pi);
794 if (!ok)
795 error(RC_CREATE_PROCESS, L"Unable to create process using '%ls'", cmdline);
796 AssignProcessToJobObject(job, pi.hProcess);
797 CloseHandle(pi.hThread);
798 WaitForSingleObjectEx(pi.hProcess, INFINITE, FALSE);
799 ok = GetExitCodeProcess(pi.hProcess, &rc);
800 if (!ok)
801 error(RC_CREATE_PROCESS, L"Failed to get exit code of process");
802 debug(L"child process exit code: %d\n", rc);
803 exit(rc);
804 }
805
806 static void
invoke_child(wchar_t * executable,wchar_t * suffix,wchar_t * cmdline)807 invoke_child(wchar_t * executable, wchar_t * suffix, wchar_t * cmdline)
808 {
809 wchar_t * child_command;
810 size_t child_command_size;
811 BOOL no_suffix = (suffix == NULL) || (*suffix == L'\0');
812 BOOL no_cmdline = (*cmdline == L'\0');
813
814 if (no_suffix && no_cmdline)
815 run_child(executable);
816 else {
817 if (no_suffix) {
818 /* add 2 for space separator + terminating NUL. */
819 child_command_size = wcslen(executable) + wcslen(cmdline) + 2;
820 }
821 else {
822 /* add 3 for 2 space separators + terminating NUL. */
823 child_command_size = wcslen(executable) + wcslen(suffix) +
824 wcslen(cmdline) + 3;
825 }
826 child_command = calloc(child_command_size, sizeof(wchar_t));
827 if (child_command == NULL)
828 error(RC_CREATE_PROCESS, L"unable to allocate %zd bytes for child command.",
829 child_command_size);
830 if (no_suffix)
831 _snwprintf_s(child_command, child_command_size,
832 child_command_size - 1, L"%ls %ls",
833 executable, cmdline);
834 else
835 _snwprintf_s(child_command, child_command_size,
836 child_command_size - 1, L"%ls %ls %ls",
837 executable, suffix, cmdline);
838 run_child(child_command);
839 free(child_command);
840 }
841 }
842
843 typedef struct {
844 wchar_t *shebang;
845 BOOL search;
846 } SHEBANG;
847
848 static SHEBANG builtin_virtual_paths [] = {
849 { L"/usr/bin/env python", TRUE },
850 { L"/usr/bin/python", FALSE },
851 { L"/usr/local/bin/python", FALSE },
852 { L"python", FALSE },
853 { NULL, FALSE },
854 };
855
856 /* For now, a static array of commands. */
857
858 #define MAX_COMMANDS 100
859
860 typedef struct {
861 wchar_t key[MAX_PATH];
862 wchar_t value[MSGSIZE];
863 } COMMAND;
864
865 static COMMAND commands[MAX_COMMANDS];
866 static int num_commands = 0;
867
868 #if defined(SKIP_PREFIX)
869
870 static wchar_t * builtin_prefixes [] = {
871 /* These must be in an order that the longest matches should be found,
872 * i.e. if the prefix is "/usr/bin/env ", it should match that entry
873 * *before* matching "/usr/bin/".
874 */
875 L"/usr/bin/env ",
876 L"/usr/bin/",
877 L"/usr/local/bin/",
878 NULL
879 };
880
skip_prefix(wchar_t * name)881 static wchar_t * skip_prefix(wchar_t * name)
882 {
883 wchar_t ** pp = builtin_prefixes;
884 wchar_t * result = name;
885 wchar_t * p;
886 size_t n;
887
888 for (; p = *pp; pp++) {
889 n = wcslen(p);
890 if (_wcsnicmp(p, name, n) == 0) {
891 result += n; /* skip the prefix */
892 if (p[n - 1] == L' ') /* No empty strings in table, so n > 1 */
893 result = skip_whitespace(result);
894 break;
895 }
896 }
897 return result;
898 }
899
900 #endif
901
902 #if defined(SEARCH_PATH)
903
904 static COMMAND path_command;
905
find_on_path(wchar_t * name)906 static COMMAND * find_on_path(wchar_t * name)
907 {
908 wchar_t * pathext;
909 size_t varsize;
910 wchar_t * context = NULL;
911 wchar_t * extension;
912 COMMAND * result = NULL;
913 DWORD len;
914 errno_t rc;
915
916 wcscpy_s(path_command.key, MAX_PATH, name);
917 if (wcschr(name, L'.') != NULL) {
918 /* assume it has an extension. */
919 len = SearchPathW(NULL, name, NULL, MSGSIZE, path_command.value, NULL);
920 if (len) {
921 result = &path_command;
922 }
923 }
924 else {
925 /* No extension - search using registered extensions. */
926 rc = _wdupenv_s(&pathext, &varsize, L"PATHEXT");
927 if (rc == 0) {
928 extension = wcstok_s(pathext, L";", &context);
929 while (extension) {
930 len = SearchPathW(NULL, name, extension, MSGSIZE, path_command.value, NULL);
931 if (len) {
932 result = &path_command;
933 break;
934 }
935 extension = wcstok_s(NULL, L";", &context);
936 }
937 free(pathext);
938 }
939 }
940 return result;
941 }
942
943 #endif
944
find_command(wchar_t * name)945 static COMMAND * find_command(wchar_t * name)
946 {
947 COMMAND * result = NULL;
948 COMMAND * cp = commands;
949 int i;
950
951 for (i = 0; i < num_commands; i++, cp++) {
952 if (_wcsicmp(cp->key, name) == 0) {
953 result = cp;
954 break;
955 }
956 }
957 #if defined(SEARCH_PATH)
958 if (result == NULL)
959 result = find_on_path(name);
960 #endif
961 return result;
962 }
963
964 static void
update_command(COMMAND * cp,wchar_t * name,wchar_t * cmdline)965 update_command(COMMAND * cp, wchar_t * name, wchar_t * cmdline)
966 {
967 wcsncpy_s(cp->key, MAX_PATH, name, _TRUNCATE);
968 wcsncpy_s(cp->value, MSGSIZE, cmdline, _TRUNCATE);
969 }
970
971 static void
add_command(wchar_t * name,wchar_t * cmdline)972 add_command(wchar_t * name, wchar_t * cmdline)
973 {
974 if (num_commands >= MAX_COMMANDS) {
975 debug(L"can't add %ls = '%ls': no room\n", name, cmdline);
976 }
977 else {
978 COMMAND * cp = &commands[num_commands++];
979
980 update_command(cp, name, cmdline);
981 }
982 }
983
984 static void
read_config_file(wchar_t * config_path)985 read_config_file(wchar_t * config_path)
986 {
987 wchar_t keynames[MSGSIZE];
988 wchar_t value[MSGSIZE];
989 DWORD read;
990 wchar_t * key;
991 COMMAND * cp;
992 wchar_t * cmdp;
993
994 read = GetPrivateProfileStringW(L"commands", NULL, NULL, keynames, MSGSIZE,
995 config_path);
996 if (read == MSGSIZE - 1) {
997 debug(L"read_commands: %ls: not enough space for names\n", config_path);
998 }
999 key = keynames;
1000 while (*key) {
1001 read = GetPrivateProfileStringW(L"commands", key, NULL, value, MSGSIZE,
1002 config_path);
1003 if (read == MSGSIZE - 1) {
1004 debug(L"read_commands: %ls: not enough space for %ls\n",
1005 config_path, key);
1006 }
1007 cmdp = skip_whitespace(value);
1008 if (*cmdp) {
1009 cp = find_command(key);
1010 if (cp == NULL)
1011 add_command(key, value);
1012 else
1013 update_command(cp, key, value);
1014 }
1015 key += wcslen(key) + 1;
1016 }
1017 }
1018
read_commands()1019 static void read_commands()
1020 {
1021 if (launcher_ini_path[0])
1022 read_config_file(launcher_ini_path);
1023 if (appdata_ini_path[0])
1024 read_config_file(appdata_ini_path);
1025 }
1026
1027 static BOOL
parse_shebang(wchar_t * shebang_line,int nchars,wchar_t ** command,wchar_t ** suffix,BOOL * search)1028 parse_shebang(wchar_t * shebang_line, int nchars, wchar_t ** command,
1029 wchar_t ** suffix, BOOL *search)
1030 {
1031 BOOL rc = FALSE;
1032 SHEBANG * vpp;
1033 size_t plen;
1034 wchar_t * p;
1035 wchar_t zapped;
1036 wchar_t * endp = shebang_line + nchars - 1;
1037 COMMAND * cp;
1038 wchar_t * skipped;
1039
1040 *command = NULL; /* failure return */
1041 *suffix = NULL;
1042 *search = FALSE;
1043
1044 if ((*shebang_line++ == L'#') && (*shebang_line++ == L'!')) {
1045 shebang_line = skip_whitespace(shebang_line);
1046 if (*shebang_line) {
1047 *command = shebang_line;
1048 for (vpp = builtin_virtual_paths; vpp->shebang; ++vpp) {
1049 plen = wcslen(vpp->shebang);
1050 if (wcsncmp(shebang_line, vpp->shebang, plen) == 0) {
1051 rc = TRUE;
1052 *search = vpp->search;
1053 /* We can do this because all builtin commands contain
1054 * "python".
1055 */
1056 *command = wcsstr(shebang_line, L"python");
1057 break;
1058 }
1059 }
1060 if (vpp->shebang == NULL) {
1061 /*
1062 * Not found in builtins - look in customized commands.
1063 *
1064 * We can't permanently modify the shebang line in case
1065 * it's not a customized command, but we can temporarily
1066 * stick a NUL after the command while searching for it,
1067 * then put back the char we zapped.
1068 */
1069 #if defined(SKIP_PREFIX)
1070 skipped = skip_prefix(shebang_line);
1071 #else
1072 skipped = shebang_line;
1073 #endif
1074 p = wcspbrk(skipped, L" \t\r\n");
1075 if (p != NULL) {
1076 zapped = *p;
1077 *p = L'\0';
1078 }
1079 cp = find_command(skipped);
1080 if (p != NULL)
1081 *p = zapped;
1082 if (cp != NULL) {
1083 *command = cp->value;
1084 if (p != NULL)
1085 *suffix = skip_whitespace(p);
1086 }
1087 }
1088 /* remove trailing whitespace */
1089 while ((endp > shebang_line) && isspace(*endp))
1090 --endp;
1091 if (endp > shebang_line)
1092 endp[1] = L'\0';
1093 }
1094 }
1095 return rc;
1096 }
1097
1098 /* #define CP_UTF8 65001 defined in winnls.h */
1099 #define CP_UTF16LE 1200
1100 #define CP_UTF16BE 1201
1101 #define CP_UTF32LE 12000
1102 #define CP_UTF32BE 12001
1103
1104 typedef struct {
1105 int length;
1106 char sequence[4];
1107 UINT code_page;
1108 } BOM;
1109
1110 /*
1111 * Strictly, we don't need to handle UTF-16 and UTF-32, since Python itself
1112 * doesn't. Never mind, one day it might - there's no harm leaving it in.
1113 */
1114 static BOM BOMs[] = {
1115 { 3, { 0xEF, 0xBB, 0xBF }, CP_UTF8 }, /* UTF-8 - keep first */
1116 /* Test UTF-32LE before UTF-16LE since UTF-16LE BOM is a prefix
1117 * of UTF-32LE BOM. */
1118 { 4, { 0xFF, 0xFE, 0x00, 0x00 }, CP_UTF32LE }, /* UTF-32LE */
1119 { 4, { 0x00, 0x00, 0xFE, 0xFF }, CP_UTF32BE }, /* UTF-32BE */
1120 { 2, { 0xFF, 0xFE }, CP_UTF16LE }, /* UTF-16LE */
1121 { 2, { 0xFE, 0xFF }, CP_UTF16BE }, /* UTF-16BE */
1122 { 0 } /* sentinel */
1123 };
1124
1125 static BOM *
find_BOM(char * buffer)1126 find_BOM(char * buffer)
1127 {
1128 /*
1129 * Look for a BOM in the input and return a pointer to the
1130 * corresponding structure, or NULL if not found.
1131 */
1132 BOM * result = NULL;
1133 BOM *bom;
1134
1135 for (bom = BOMs; bom->length; bom++) {
1136 if (strncmp(bom->sequence, buffer, bom->length) == 0) {
1137 result = bom;
1138 break;
1139 }
1140 }
1141 return result;
1142 }
1143
1144 static char *
find_terminator(char * buffer,int len,BOM * bom)1145 find_terminator(char * buffer, int len, BOM *bom)
1146 {
1147 char * result = NULL;
1148 char * end = buffer + len;
1149 char * p;
1150 char c;
1151 int cp;
1152
1153 for (p = buffer; p < end; p++) {
1154 c = *p;
1155 if (c == '\r') {
1156 result = p;
1157 break;
1158 }
1159 if (c == '\n') {
1160 result = p;
1161 break;
1162 }
1163 }
1164 if (result != NULL) {
1165 cp = bom->code_page;
1166
1167 /* adjustments to include all bytes of the char */
1168 /* no adjustment needed for UTF-8 or big endian */
1169 if (cp == CP_UTF16LE)
1170 ++result;
1171 else if (cp == CP_UTF32LE)
1172 result += 3;
1173 ++result; /* point just past terminator */
1174 }
1175 return result;
1176 }
1177
1178 static BOOL
validate_version(wchar_t * p)1179 validate_version(wchar_t * p)
1180 {
1181 /*
1182 Version information should start with the major version,
1183 Optionally followed by a period and a minor version,
1184 Optionally followed by a minus and one of 32 or 64.
1185 Valid examples:
1186 2
1187 3
1188 2.7
1189 3.6
1190 2.7-32
1191 The intent is to add to the valid patterns:
1192 3.10
1193 3-32
1194 3.6-64
1195 3-64
1196 */
1197 BOOL result = (p != NULL); /* Default to False if null pointer. */
1198
1199 result = result && iswdigit(*p); /* Result = False if first string element is not a digit. */
1200
1201 while (result && iswdigit(*p)) /* Require a major version */
1202 ++p; /* Skip all leading digit(s) */
1203 if (result && (*p == L'.')) /* Allow . for major minor separator.*/
1204 {
1205 result = iswdigit(*++p); /* Must be at least one digit */
1206 while (result && iswdigit(*++p)) ; /* Skip any more Digits */
1207 }
1208 if (result && (*p == L'-')) { /* Allow - for Bits Separator */
1209 switch(*++p){
1210 case L'3': /* 3 is OK */
1211 result = (*++p == L'2') && !*++p; /* only if followed by 2 and ended.*/
1212 break;
1213 case L'6': /* 6 is OK */
1214 result = (*++p == L'4') && !*++p; /* only if followed by 4 and ended.*/
1215 break;
1216 default:
1217 result = FALSE;
1218 break;
1219 }
1220 }
1221 result = result && !*p; /* Must have reached EOS */
1222 return result;
1223
1224 }
1225
1226 typedef struct {
1227 unsigned short min;
1228 unsigned short max;
1229 wchar_t version[MAX_VERSION_SIZE];
1230 } PYC_MAGIC;
1231
1232 static PYC_MAGIC magic_values[] = {
1233 { 50823, 50823, L"2.0" },
1234 { 60202, 60202, L"2.1" },
1235 { 60717, 60717, L"2.2" },
1236 { 62011, 62021, L"2.3" },
1237 { 62041, 62061, L"2.4" },
1238 { 62071, 62131, L"2.5" },
1239 { 62151, 62161, L"2.6" },
1240 { 62171, 62211, L"2.7" },
1241 { 3000, 3131, L"3.0" },
1242 { 3141, 3151, L"3.1" },
1243 { 3160, 3180, L"3.2" },
1244 { 3190, 3230, L"3.3" },
1245 { 3250, 3310, L"3.4" },
1246 { 3320, 3351, L"3.5" },
1247 { 3360, 3379, L"3.6" },
1248 { 3390, 3399, L"3.7" },
1249 { 3400, 3419, L"3.8" },
1250 { 3420, 3429, L"3.9" },
1251 { 0 }
1252 };
1253
1254 static INSTALLED_PYTHON *
find_by_magic(unsigned short magic)1255 find_by_magic(unsigned short magic)
1256 {
1257 INSTALLED_PYTHON * result = NULL;
1258 PYC_MAGIC * mp;
1259
1260 for (mp = magic_values; mp->min; mp++) {
1261 if ((magic >= mp->min) && (magic <= mp->max)) {
1262 result = locate_python(mp->version, FALSE);
1263 if (result != NULL)
1264 break;
1265 }
1266 }
1267 return result;
1268 }
1269
1270 static void
maybe_handle_shebang(wchar_t ** argv,wchar_t * cmdline)1271 maybe_handle_shebang(wchar_t ** argv, wchar_t * cmdline)
1272 {
1273 /*
1274 * Look for a shebang line in the first argument. If found
1275 * and we spawn a child process, this never returns. If it
1276 * does return then we process the args "normally".
1277 *
1278 * argv[0] might be a filename with a shebang.
1279 */
1280 FILE * fp;
1281 errno_t rc = _wfopen_s(&fp, *argv, L"rb");
1282 char buffer[BUFSIZE];
1283 wchar_t shebang_line[BUFSIZE + 1];
1284 size_t read;
1285 char *p;
1286 char * start;
1287 char * shebang_alias = (char *) shebang_line;
1288 BOM* bom;
1289 int i, j, nchars = 0;
1290 int header_len;
1291 BOOL is_virt;
1292 BOOL search;
1293 wchar_t * command;
1294 wchar_t * suffix;
1295 COMMAND *cmd = NULL;
1296 INSTALLED_PYTHON * ip;
1297
1298 if (rc == 0) {
1299 read = fread(buffer, sizeof(char), BUFSIZE, fp);
1300 debug(L"maybe_handle_shebang: read %zd bytes\n", read);
1301 fclose(fp);
1302
1303 if ((read >= 4) && (buffer[3] == '\n') && (buffer[2] == '\r')) {
1304 ip = find_by_magic((((unsigned char)buffer[1]) << 8 |
1305 (unsigned char)buffer[0]) & 0xFFFF);
1306 if (ip != NULL) {
1307 debug(L"script file is compiled against Python %ls\n",
1308 ip->version);
1309 invoke_child(ip->executable, NULL, cmdline);
1310 }
1311 }
1312 /* Look for BOM */
1313 bom = find_BOM(buffer);
1314 if (bom == NULL) {
1315 start = buffer;
1316 debug(L"maybe_handle_shebang: BOM not found, using UTF-8\n");
1317 bom = BOMs; /* points to UTF-8 entry - the default */
1318 }
1319 else {
1320 debug(L"maybe_handle_shebang: BOM found, code page %u\n",
1321 bom->code_page);
1322 start = &buffer[bom->length];
1323 }
1324 p = find_terminator(start, BUFSIZE, bom);
1325 /*
1326 * If no CR or LF was found in the heading,
1327 * we assume it's not a shebang file.
1328 */
1329 if (p == NULL) {
1330 debug(L"maybe_handle_shebang: No line terminator found\n");
1331 }
1332 else {
1333 /*
1334 * Found line terminator - parse the shebang.
1335 *
1336 * Strictly, we don't need to handle UTF-16 anf UTF-32,
1337 * since Python itself doesn't.
1338 * Never mind, one day it might.
1339 */
1340 header_len = (int) (p - start);
1341 switch(bom->code_page) {
1342 case CP_UTF8:
1343 nchars = MultiByteToWideChar(bom->code_page,
1344 0,
1345 start, header_len, shebang_line,
1346 BUFSIZE);
1347 break;
1348 case CP_UTF16BE:
1349 if (header_len % 2 != 0) {
1350 debug(L"maybe_handle_shebang: UTF-16BE, but an odd number \
1351 of bytes: %d\n", header_len);
1352 /* nchars = 0; Not needed - initialised to 0. */
1353 }
1354 else {
1355 for (i = header_len; i > 0; i -= 2) {
1356 shebang_alias[i - 1] = start[i - 2];
1357 shebang_alias[i - 2] = start[i - 1];
1358 }
1359 nchars = header_len / sizeof(wchar_t);
1360 }
1361 break;
1362 case CP_UTF16LE:
1363 if ((header_len % 2) != 0) {
1364 debug(L"UTF-16LE, but an odd number of bytes: %d\n",
1365 header_len);
1366 /* nchars = 0; Not needed - initialised to 0. */
1367 }
1368 else {
1369 /* no actual conversion needed. */
1370 memcpy(shebang_line, start, header_len);
1371 nchars = header_len / sizeof(wchar_t);
1372 }
1373 break;
1374 case CP_UTF32BE:
1375 if (header_len % 4 != 0) {
1376 debug(L"UTF-32BE, but not divisible by 4: %d\n",
1377 header_len);
1378 /* nchars = 0; Not needed - initialised to 0. */
1379 }
1380 else {
1381 for (i = header_len, j = header_len / 2; i > 0; i -= 4,
1382 j -= 2) {
1383 shebang_alias[j - 1] = start[i - 2];
1384 shebang_alias[j - 2] = start[i - 1];
1385 }
1386 nchars = header_len / sizeof(wchar_t);
1387 }
1388 break;
1389 case CP_UTF32LE:
1390 if (header_len % 4 != 0) {
1391 debug(L"UTF-32LE, but not divisible by 4: %d\n",
1392 header_len);
1393 /* nchars = 0; Not needed - initialised to 0. */
1394 }
1395 else {
1396 for (i = header_len, j = header_len / 2; i > 0; i -= 4,
1397 j -= 2) {
1398 shebang_alias[j - 1] = start[i - 3];
1399 shebang_alias[j - 2] = start[i - 4];
1400 }
1401 nchars = header_len / sizeof(wchar_t);
1402 }
1403 break;
1404 }
1405 if (nchars > 0) {
1406 shebang_line[--nchars] = L'\0';
1407 is_virt = parse_shebang(shebang_line, nchars, &command,
1408 &suffix, &search);
1409 if (command != NULL) {
1410 debug(L"parse_shebang: found command: %ls\n", command);
1411 if (!is_virt) {
1412 invoke_child(command, suffix, cmdline);
1413 }
1414 else {
1415 suffix = wcschr(command, L' ');
1416 if (suffix != NULL) {
1417 *suffix++ = L'\0';
1418 suffix = skip_whitespace(suffix);
1419 }
1420 if (wcsncmp(command, L"python", 6))
1421 error(RC_BAD_VIRTUAL_PATH, L"Unknown virtual \
1422 path '%ls'", command);
1423 command += 6; /* skip past "python" */
1424 if (search && ((*command == L'\0') || isspace(*command))) {
1425 /* Command is eligible for path search, and there
1426 * is no version specification.
1427 */
1428 debug(L"searching PATH for python executable\n");
1429 cmd = find_on_path(PYTHON_EXECUTABLE);
1430 debug(L"Python on path: %ls\n", cmd ? cmd->value : L"<not found>");
1431 if (cmd) {
1432 debug(L"located python on PATH: %ls\n", cmd->value);
1433 invoke_child(cmd->value, suffix, cmdline);
1434 /* Exit here, as we have found the command */
1435 return;
1436 }
1437 /* FALL THROUGH: No python found on PATH, so fall
1438 * back to locating the correct installed python.
1439 */
1440 }
1441 if (*command && !validate_version(command))
1442 error(RC_BAD_VIRTUAL_PATH, L"Invalid version \
1443 specification: '%ls'.\nIn the first line of the script, 'python' needs to be \
1444 followed by a valid version specifier.\nPlease check the documentation.",
1445 command);
1446 /* TODO could call validate_version(command) */
1447 ip = locate_python(command, TRUE);
1448 if (ip == NULL) {
1449 error(RC_NO_PYTHON, L"Requested Python version \
1450 (%ls) is not installed", command);
1451 }
1452 else {
1453 invoke_child(ip->executable, suffix, cmdline);
1454 }
1455 }
1456 }
1457 }
1458 }
1459 }
1460 }
1461
1462 static wchar_t *
skip_me(wchar_t * cmdline)1463 skip_me(wchar_t * cmdline)
1464 {
1465 BOOL quoted;
1466 wchar_t c;
1467 wchar_t * result = cmdline;
1468
1469 quoted = cmdline[0] == L'\"';
1470 if (!quoted)
1471 c = L' ';
1472 else {
1473 c = L'\"';
1474 ++result;
1475 }
1476 result = wcschr(result, c);
1477 if (result == NULL) /* when, for example, just exe name on command line */
1478 result = L"";
1479 else {
1480 ++result; /* skip past space or closing quote */
1481 result = skip_whitespace(result);
1482 }
1483 return result;
1484 }
1485
1486 static DWORD version_high = 0;
1487 static DWORD version_low = 0;
1488
1489 static void
get_version_info(wchar_t * version_text,size_t size)1490 get_version_info(wchar_t * version_text, size_t size)
1491 {
1492 WORD maj, min, rel, bld;
1493
1494 if (!version_high && !version_low)
1495 wcsncpy_s(version_text, size, L"0.1", _TRUNCATE); /* fallback */
1496 else {
1497 maj = HIWORD(version_high);
1498 min = LOWORD(version_high);
1499 rel = HIWORD(version_low);
1500 bld = LOWORD(version_low);
1501 _snwprintf_s(version_text, size, _TRUNCATE, L"%d.%d.%d.%d", maj,
1502 min, rel, bld);
1503 }
1504 }
1505
1506 static void
show_help_text(wchar_t ** argv)1507 show_help_text(wchar_t ** argv)
1508 {
1509 wchar_t version_text [MAX_PATH];
1510 #if defined(_M_X64)
1511 BOOL canDo64bit = TRUE;
1512 #else
1513 /* If we are a 32bit process on a 64bit Windows, first hit the 64bit keys. */
1514 BOOL canDo64bit = FALSE;
1515 IsWow64Process(GetCurrentProcess(), &canDo64bit);
1516 #endif
1517
1518 get_version_info(version_text, MAX_PATH);
1519 fwprintf(stdout, L"\
1520 Python Launcher for Windows Version %ls\n\n", version_text);
1521 fwprintf(stdout, L"\
1522 usage:\n\
1523 %ls [launcher-args] [python-args] [script [script-args]]\n\n", argv[0]);
1524 fputws(L"\
1525 Launcher arguments:\n\n\
1526 -2 : Launch the latest Python 2.x version\n\
1527 -3 : Launch the latest Python 3.x version\n\
1528 -X.Y : Launch the specified Python version\n", stdout);
1529 if (canDo64bit) {
1530 fputws(L"\
1531 The above all default to 64 bit if a matching 64 bit python is present.\n\
1532 -X.Y-32: Launch the specified 32bit Python version\n\
1533 -X-32 : Launch the latest 32bit Python X version\n\
1534 -X.Y-64: Launch the specified 64bit Python version\n\
1535 -X-64 : Launch the latest 64bit Python X version", stdout);
1536 }
1537 fputws(L"\n-0 --list : List the available pythons", stdout);
1538 fputws(L"\n-0p --list-paths : List with paths", stdout);
1539 fputws(L"\n\n If no script is specified the specified interpreter is opened.", stdout);
1540 fputws(L"\nIf an exact version is not given, using the latest version can be overridden by", stdout);
1541 fputws(L"\nany of the following, (in priority order):", stdout);
1542 fputws(L"\n An active virtual environment", stdout);
1543 fputws(L"\n A shebang line in the script (if present)", stdout);
1544 fputws(L"\n With -2 or -3 flag a matching PY_PYTHON2 or PY_PYTHON3 Enviroment variable", stdout);
1545 fputws(L"\n A PY_PYTHON Enviroment variable", stdout);
1546 fputws(L"\n From [defaults] in py.ini in your %LOCALAPPDATA%\\py.ini", stdout);
1547 fputws(L"\n From [defaults] in py.ini beside py.exe (use `where py` to locate)", stdout);
1548 fputws(L"\n\nThe following help text is from Python:\n\n", stdout);
1549 fflush(stdout);
1550 }
1551
1552 static BOOL
show_python_list(wchar_t ** argv)1553 show_python_list(wchar_t ** argv)
1554 {
1555 /*
1556 * Display options -0
1557 */
1558 INSTALLED_PYTHON * result = NULL;
1559 INSTALLED_PYTHON * ip = installed_pythons; /* List of installed pythons */
1560 INSTALLED_PYTHON * defpy = locate_python(L"", FALSE);
1561 size_t i = 0;
1562 wchar_t *p = argv[1];
1563 wchar_t *ver_fmt = L"-%ls-%d";
1564 wchar_t *fmt = L"\n %ls";
1565 wchar_t *defind = L" *"; /* Default indicator */
1566
1567 /*
1568 * Output informational messages to stderr to keep output
1569 * clean for use in pipes, etc.
1570 */
1571 fwprintf(stderr,
1572 L"Installed Pythons found by %s Launcher for Windows", argv[0]);
1573 if (!_wcsicmp(p, L"-0p") || !_wcsicmp(p, L"--list-paths"))
1574 fmt = L"\n %-15ls%ls"; /* include path */
1575
1576 if (num_installed_pythons == 0) /* We have somehow got here without searching for pythons */
1577 locate_all_pythons(); /* Find them, Populates installed_pythons */
1578
1579 if (num_installed_pythons == 0) /* No pythons found */
1580 fwprintf(stderr, L"\nNo Installed Pythons Found!");
1581 else
1582 {
1583 for (i = 0; i < num_installed_pythons; i++, ip++) {
1584 wchar_t version[BUFSIZ];
1585 if (wcscmp(ip->version, L"venv") == 0) {
1586 wcscpy_s(version, BUFSIZ, L"(venv)");
1587 }
1588 else {
1589 swprintf_s(version, BUFSIZ, ver_fmt, ip->version, ip->bits);
1590 }
1591
1592 if (ip->exe_display[0]) {
1593 fwprintf(stdout, fmt, version, ip->exe_display);
1594 }
1595 else {
1596 fwprintf(stdout, fmt, version, ip->executable);
1597 }
1598 /* If there is a default indicate it */
1599 if (defpy == ip)
1600 fwprintf(stderr, defind);
1601 }
1602 }
1603
1604 if ((defpy == NULL) && (num_installed_pythons > 0))
1605 /* We have pythons but none is the default */
1606 fwprintf(stderr, L"\n\nCan't find a Default Python.\n\n");
1607 else
1608 fwprintf(stderr, L"\n\n"); /* End with a blank line */
1609 return FALSE; /* If this has been called we cannot continue */
1610 }
1611
1612 #if defined(VENV_REDIRECT)
1613
1614 static int
find_home_value(const char * buffer,const char ** start,DWORD * length)1615 find_home_value(const char *buffer, const char **start, DWORD *length)
1616 {
1617 for (const char *s = strstr(buffer, "home"); s; s = strstr(s + 1, "\nhome")) {
1618 if (*s == '\n') {
1619 ++s;
1620 }
1621 for (int i = 4; i > 0 && *s; --i, ++s);
1622
1623 while (*s && iswspace(*s)) {
1624 ++s;
1625 }
1626 if (*s != L'=') {
1627 continue;
1628 }
1629
1630 do {
1631 ++s;
1632 } while (*s && iswspace(*s));
1633
1634 *start = s;
1635 char *nl = strchr(s, '\n');
1636 if (nl) {
1637 *length = (DWORD)((ptrdiff_t)nl - (ptrdiff_t)s);
1638 } else {
1639 *length = (DWORD)strlen(s);
1640 }
1641 return 1;
1642 }
1643 return 0;
1644 }
1645 #endif
1646
1647 static wchar_t *
wcsdup_pad(const wchar_t * s,int padding,int * newlen)1648 wcsdup_pad(const wchar_t *s, int padding, int *newlen)
1649 {
1650 size_t len = wcslen(s);
1651 len += 1 + padding;
1652 wchar_t *r = (wchar_t *)malloc(len * sizeof(wchar_t));
1653 if (!r) {
1654 return NULL;
1655 }
1656 if (wcscpy_s(r, len, s)) {
1657 free(r);
1658 return NULL;
1659 }
1660 *newlen = len < MAXINT ? (int)len : MAXINT;
1661 return r;
1662 }
1663
1664 static wchar_t *
get_process_name()1665 get_process_name()
1666 {
1667 DWORD bufferLen = MAX_PATH;
1668 DWORD len = bufferLen;
1669 wchar_t *r = NULL;
1670
1671 while (!r) {
1672 r = (wchar_t *)malloc(bufferLen * sizeof(wchar_t));
1673 if (!r) {
1674 error(RC_NO_MEMORY, L"out of memory");
1675 return NULL;
1676 }
1677 len = GetModuleFileNameW(NULL, r, bufferLen);
1678 if (len == 0) {
1679 free(r);
1680 error(0, L"Failed to get module name");
1681 return NULL;
1682 } else if (len == bufferLen &&
1683 GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
1684 free(r);
1685 r = NULL;
1686 bufferLen *= 2;
1687 }
1688 }
1689
1690 return r;
1691 }
1692
1693 static int
process(int argc,wchar_t ** argv)1694 process(int argc, wchar_t ** argv)
1695 {
1696 wchar_t * wp;
1697 wchar_t * command;
1698 wchar_t * executable;
1699 wchar_t * p;
1700 wchar_t * argv0;
1701 int rc = 0;
1702 INSTALLED_PYTHON * ip;
1703 BOOL valid;
1704 DWORD size, attrs;
1705 wchar_t message[MSGSIZE];
1706 void * version_data;
1707 VS_FIXEDFILEINFO * file_info;
1708 UINT block_size;
1709 #if defined(VENV_REDIRECT)
1710 wchar_t * venv_cfg_path;
1711 int newlen;
1712 #elif defined(SCRIPT_WRAPPER)
1713 wchar_t * newcommand;
1714 wchar_t * av[2];
1715 int newlen;
1716 HRESULT hr;
1717 int index;
1718 #else
1719 HRESULT hr;
1720 int index;
1721 #endif
1722
1723 setvbuf(stderr, (char *)NULL, _IONBF, 0);
1724 wp = get_env(L"PYLAUNCH_DEBUG");
1725 if ((wp != NULL) && (*wp != L'\0'))
1726 log_fp = stderr;
1727
1728 #if defined(_M_X64)
1729 debug(L"launcher build: 64bit\n");
1730 #else
1731 debug(L"launcher build: 32bit\n");
1732 #endif
1733 #if defined(_WINDOWS)
1734 debug(L"launcher executable: Windows\n");
1735 #else
1736 debug(L"launcher executable: Console\n");
1737 #endif
1738 #if !defined(VENV_REDIRECT)
1739 /* Get the local appdata folder (non-roaming) */
1740 hr = SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA,
1741 NULL, 0, appdata_ini_path);
1742 if (hr != S_OK) {
1743 debug(L"SHGetFolderPath failed: %X\n", hr);
1744 appdata_ini_path[0] = L'\0';
1745 }
1746 else {
1747 wcsncat_s(appdata_ini_path, MAX_PATH, L"\\py.ini", _TRUNCATE);
1748 attrs = GetFileAttributesW(appdata_ini_path);
1749 if (attrs == INVALID_FILE_ATTRIBUTES) {
1750 debug(L"File '%ls' non-existent\n", appdata_ini_path);
1751 appdata_ini_path[0] = L'\0';
1752 } else {
1753 debug(L"Using local configuration file '%ls'\n", appdata_ini_path);
1754 }
1755 }
1756 #endif
1757 argv0 = get_process_name();
1758 size = GetFileVersionInfoSizeW(argv0, &size);
1759 if (size == 0) {
1760 winerror(GetLastError(), message, MSGSIZE);
1761 debug(L"GetFileVersionInfoSize failed: %ls\n", message);
1762 }
1763 else {
1764 version_data = malloc(size);
1765 if (version_data) {
1766 valid = GetFileVersionInfoW(argv0, 0, size,
1767 version_data);
1768 if (!valid)
1769 debug(L"GetFileVersionInfo failed: %X\n", GetLastError());
1770 else {
1771 valid = VerQueryValueW(version_data, L"\\",
1772 (LPVOID *) &file_info, &block_size);
1773 if (!valid)
1774 debug(L"VerQueryValue failed: %X\n", GetLastError());
1775 else {
1776 version_high = file_info->dwFileVersionMS;
1777 version_low = file_info->dwFileVersionLS;
1778 }
1779 }
1780 free(version_data);
1781 }
1782 }
1783
1784 #if defined(VENV_REDIRECT)
1785 /* Allocate some extra space for new filenames */
1786 venv_cfg_path = wcsdup_pad(argv0, 32, &newlen);
1787 if (!venv_cfg_path) {
1788 error(RC_NO_MEMORY, L"Failed to copy module name");
1789 }
1790 p = wcsrchr(venv_cfg_path, L'\\');
1791
1792 if (p == NULL) {
1793 error(RC_NO_VENV_CFG, L"No pyvenv.cfg file");
1794 }
1795 p[0] = L'\0';
1796 wcscat_s(venv_cfg_path, newlen, L"\\pyvenv.cfg");
1797 attrs = GetFileAttributesW(venv_cfg_path);
1798 if (attrs == INVALID_FILE_ATTRIBUTES) {
1799 debug(L"File '%ls' non-existent\n", venv_cfg_path);
1800 p[0] = '\0';
1801 p = wcsrchr(venv_cfg_path, L'\\');
1802 if (p != NULL) {
1803 p[0] = '\0';
1804 wcscat_s(venv_cfg_path, newlen, L"\\pyvenv.cfg");
1805 attrs = GetFileAttributesW(venv_cfg_path);
1806 if (attrs == INVALID_FILE_ATTRIBUTES) {
1807 debug(L"File '%ls' non-existent\n", venv_cfg_path);
1808 error(RC_NO_VENV_CFG, L"No pyvenv.cfg file");
1809 }
1810 }
1811 }
1812 debug(L"Using venv configuration file '%ls'\n", venv_cfg_path);
1813 #else
1814 /* Allocate some extra space for new filenames */
1815 if (wcscpy_s(launcher_ini_path, MAX_PATH, argv0)) {
1816 error(RC_NO_MEMORY, L"Failed to copy module name");
1817 }
1818 p = wcsrchr(launcher_ini_path, L'\\');
1819
1820 if (p == NULL) {
1821 debug(L"GetModuleFileNameW returned value has no backslash: %ls\n",
1822 launcher_ini_path);
1823 launcher_ini_path[0] = L'\0';
1824 }
1825 else {
1826 p[0] = L'\0';
1827 wcscat_s(launcher_ini_path, MAX_PATH, L"\\py.ini");
1828 attrs = GetFileAttributesW(launcher_ini_path);
1829 if (attrs == INVALID_FILE_ATTRIBUTES) {
1830 debug(L"File '%ls' non-existent\n", launcher_ini_path);
1831 launcher_ini_path[0] = L'\0';
1832 } else {
1833 debug(L"Using global configuration file '%ls'\n", launcher_ini_path);
1834 }
1835 }
1836 #endif
1837
1838 command = skip_me(GetCommandLineW());
1839 debug(L"Called with command line: %ls\n", command);
1840
1841 #if !defined(VENV_REDIRECT)
1842 /* bpo-35811: The __PYVENV_LAUNCHER__ variable is used to
1843 * override sys.executable and locate the original prefix path.
1844 * However, if it is silently inherited by a non-venv Python
1845 * process, that process will believe it is running in the venv
1846 * still. This is the only place where *we* can clear it (that is,
1847 * when py.exe is being used to launch Python), so we do.
1848 */
1849 SetEnvironmentVariableW(L"__PYVENV_LAUNCHER__", NULL);
1850 #endif
1851
1852 #if defined(SCRIPT_WRAPPER)
1853 /* The launcher is being used in "script wrapper" mode.
1854 * There should therefore be a Python script named <exename>-script.py in
1855 * the same directory as the launcher executable.
1856 * Put the script name into argv as the first (script name) argument.
1857 */
1858
1859 /* Get the wrapped script name - if the script is not present, this will
1860 * terminate the program with an error.
1861 */
1862 locate_wrapped_script();
1863
1864 /* Add the wrapped script to the start of command */
1865 newlen = wcslen(wrapped_script_path) + wcslen(command) + 2; /* ' ' + NUL */
1866 newcommand = malloc(sizeof(wchar_t) * newlen);
1867 if (!newcommand) {
1868 error(RC_NO_MEMORY, L"Could not allocate new command line");
1869 }
1870 else {
1871 wcscpy_s(newcommand, newlen, wrapped_script_path);
1872 wcscat_s(newcommand, newlen, L" ");
1873 wcscat_s(newcommand, newlen, command);
1874 debug(L"Running wrapped script with command line '%ls'\n", newcommand);
1875 read_commands();
1876 av[0] = wrapped_script_path;
1877 av[1] = NULL;
1878 maybe_handle_shebang(av, newcommand);
1879 /* Returns if no shebang line - pass to default processing */
1880 command = newcommand;
1881 valid = FALSE;
1882 }
1883 #elif defined(VENV_REDIRECT)
1884 {
1885 FILE *f;
1886 char buffer[4096]; /* 4KB should be enough for anybody */
1887 char *start;
1888 DWORD len, cch, cch_actual;
1889 size_t cb;
1890 if (_wfopen_s(&f, venv_cfg_path, L"r")) {
1891 error(RC_BAD_VENV_CFG, L"Cannot read '%ls'", venv_cfg_path);
1892 }
1893 cb = fread_s(buffer, sizeof(buffer), sizeof(buffer[0]),
1894 sizeof(buffer) / sizeof(buffer[0]), f);
1895 fclose(f);
1896
1897 if (!find_home_value(buffer, &start, &len)) {
1898 error(RC_BAD_VENV_CFG, L"Cannot find home in '%ls'",
1899 venv_cfg_path);
1900 }
1901
1902 cch = MultiByteToWideChar(CP_UTF8, 0, start, len, NULL, 0);
1903 if (!cch) {
1904 error(0, L"Cannot determine memory for home path");
1905 }
1906 cch += (DWORD)wcslen(PYTHON_EXECUTABLE) + 1 + 1; /* include sep and null */
1907 executable = (wchar_t *)malloc(cch * sizeof(wchar_t));
1908 if (executable == NULL) {
1909 error(RC_NO_MEMORY, L"A memory allocation failed");
1910 }
1911 cch_actual = MultiByteToWideChar(CP_UTF8, 0, start, len, executable, cch);
1912 if (!cch_actual) {
1913 error(RC_BAD_VENV_CFG, L"Cannot decode home path in '%ls'",
1914 venv_cfg_path);
1915 }
1916 if (executable[cch_actual - 1] != L'\\') {
1917 executable[cch_actual++] = L'\\';
1918 executable[cch_actual] = L'\0';
1919 }
1920 if (wcscat_s(executable, cch, PYTHON_EXECUTABLE)) {
1921 error(RC_BAD_VENV_CFG, L"Cannot create executable path from '%ls'",
1922 venv_cfg_path);
1923 }
1924 if (GetFileAttributesW(executable) == INVALID_FILE_ATTRIBUTES) {
1925 error(RC_NO_PYTHON, L"No Python at '%ls'", executable);
1926 }
1927 if (!SetEnvironmentVariableW(L"__PYVENV_LAUNCHER__", argv0)) {
1928 error(0, L"Failed to set launcher environment");
1929 }
1930 valid = 1;
1931 }
1932 #else
1933 if (argc <= 1) {
1934 valid = FALSE;
1935 p = NULL;
1936 }
1937 else {
1938 p = argv[1];
1939 if ((argc == 2) && // list version args
1940 (!wcsncmp(p, L"-0", wcslen(L"-0")) ||
1941 !wcsncmp(p, L"--list", wcslen(L"--list"))))
1942 {
1943 show_python_list(argv);
1944 return rc;
1945 }
1946 valid = valid && (*p == L'-') && validate_version(&p[1]);
1947 if (valid) {
1948 ip = locate_python(&p[1], FALSE);
1949 if (ip == NULL)
1950 {
1951 fwprintf(stdout, \
1952 L"Python %ls not found!\n", &p[1]);
1953 valid = show_python_list(argv);
1954 error(RC_NO_PYTHON, L"Requested Python version (%ls) not \
1955 installed, use -0 for available pythons", &p[1]);
1956 }
1957 executable = ip->executable;
1958 command += wcslen(p);
1959 command = skip_whitespace(command);
1960 }
1961 else {
1962 for (index = 1; index < argc; ++index) {
1963 if (*argv[index] != L'-')
1964 break;
1965 }
1966 if (index < argc) {
1967 read_commands();
1968 maybe_handle_shebang(&argv[index], command);
1969 }
1970 }
1971 }
1972 #endif
1973
1974 if (!valid) {
1975 if ((argc == 2) && (!_wcsicmp(p, L"-h") || !_wcsicmp(p, L"--help")))
1976 show_help_text(argv);
1977 if ((argc == 2) &&
1978 (!_wcsicmp(p, L"-0") || !_wcsicmp(p, L"--list") ||
1979 !_wcsicmp(p, L"-0p") || !_wcsicmp(p, L"--list-paths")))
1980 {
1981 executable = NULL; /* Info call only */
1982 }
1983 else {
1984 /* look for the default Python */
1985 ip = locate_python(L"", FALSE);
1986 if (ip == NULL)
1987 error(RC_NO_PYTHON, L"Can't find a default Python.");
1988 executable = ip->executable;
1989 }
1990 }
1991 if (executable != NULL)
1992 invoke_child(executable, NULL, command);
1993 else
1994 rc = RC_NO_PYTHON;
1995 return rc;
1996 }
1997
1998 #if defined(_WINDOWS)
1999
wWinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPWSTR lpstrCmd,int nShow)2000 int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
2001 LPWSTR lpstrCmd, int nShow)
2002 {
2003 return process(__argc, __wargv);
2004 }
2005
2006 #else
2007
wmain(int argc,wchar_t ** argv)2008 int cdecl wmain(int argc, wchar_t ** argv)
2009 {
2010 return process(argc, argv);
2011 }
2012
2013 #endif
2014