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Merge branch 'ea/blame-use-oideq'
[thirdparty/git.git] / compat / mingw.c
1 #include "../git-compat-util.h"
2 #include "win32.h"
3 #include <conio.h>
4 #include <wchar.h>
5 #include "../strbuf.h"
6 #include "../run-command.h"
7 #include "../cache.h"
8 #include "win32/lazyload.h"
9 #include "../config.h"
10 #include "dir.h"
11
12 #define HCAST(type, handle) ((type)(intptr_t)handle)
13
14 static const int delay[] = { 0, 1, 10, 20, 40 };
15
16 void open_in_gdb(void)
17 {
18 static struct child_process cp = CHILD_PROCESS_INIT;
19 extern char *_pgmptr;
20
21 strvec_pushl(&cp.args, "mintty", "gdb", NULL);
22 strvec_pushf(&cp.args, "--pid=%d", getpid());
23 cp.clean_on_exit = 1;
24 if (start_command(&cp) < 0)
25 die_errno("Could not start gdb");
26 sleep(1);
27 }
28
29 int err_win_to_posix(DWORD winerr)
30 {
31 int error = ENOSYS;
32 switch(winerr) {
33 case ERROR_ACCESS_DENIED: error = EACCES; break;
34 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
35 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
36 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
37 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
38 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
39 case ERROR_BAD_COMMAND: error = EIO; break;
40 case ERROR_BAD_DEVICE: error = ENODEV; break;
41 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
42 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
43 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
44 case ERROR_BAD_LENGTH: error = EINVAL; break;
45 case ERROR_BAD_PATHNAME: error = ENOENT; break;
46 case ERROR_BAD_PIPE: error = EPIPE; break;
47 case ERROR_BAD_UNIT: error = ENODEV; break;
48 case ERROR_BAD_USERNAME: error = EINVAL; break;
49 case ERROR_BROKEN_PIPE: error = EPIPE; break;
50 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
51 case ERROR_BUSY: error = EBUSY; break;
52 case ERROR_BUSY_DRIVE: error = EBUSY; break;
53 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
54 case ERROR_CANNOT_MAKE: error = EACCES; break;
55 case ERROR_CANTOPEN: error = EIO; break;
56 case ERROR_CANTREAD: error = EIO; break;
57 case ERROR_CANTWRITE: error = EIO; break;
58 case ERROR_CRC: error = EIO; break;
59 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
60 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
61 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
62 case ERROR_DIRECTORY: error = EINVAL; break;
63 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
64 case ERROR_DISK_CHANGE: error = EIO; break;
65 case ERROR_DISK_FULL: error = ENOSPC; break;
66 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
67 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
68 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
69 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
70 case ERROR_FILE_EXISTS: error = EEXIST; break;
71 case ERROR_FILE_INVALID: error = ENODEV; break;
72 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
73 case ERROR_GEN_FAILURE: error = EIO; break;
74 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
75 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
76 case ERROR_INVALID_ACCESS: error = EACCES; break;
77 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
78 case ERROR_INVALID_BLOCK: error = EFAULT; break;
79 case ERROR_INVALID_DATA: error = EINVAL; break;
80 case ERROR_INVALID_DRIVE: error = ENODEV; break;
81 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
82 case ERROR_INVALID_FLAGS: error = EINVAL; break;
83 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
84 case ERROR_INVALID_HANDLE: error = EBADF; break;
85 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
86 case ERROR_INVALID_NAME: error = EINVAL; break;
87 case ERROR_INVALID_OWNER: error = EINVAL; break;
88 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
89 case ERROR_INVALID_PASSWORD: error = EPERM; break;
90 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
91 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
92 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
93 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
94 case ERROR_IO_DEVICE: error = EIO; break;
95 case ERROR_IO_INCOMPLETE: error = EINTR; break;
96 case ERROR_LOCKED: error = EBUSY; break;
97 case ERROR_LOCK_VIOLATION: error = EACCES; break;
98 case ERROR_LOGON_FAILURE: error = EACCES; break;
99 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
100 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
101 case ERROR_MORE_DATA: error = EPIPE; break;
102 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
103 case ERROR_NOACCESS: error = EFAULT; break;
104 case ERROR_NONE_MAPPED: error = EINVAL; break;
105 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
106 case ERROR_NOT_READY: error = EAGAIN; break;
107 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
108 case ERROR_NO_DATA: error = EPIPE; break;
109 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
110 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
111 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
112 case ERROR_OPEN_FAILED: error = EIO; break;
113 case ERROR_OPEN_FILES: error = EBUSY; break;
114 case ERROR_OPERATION_ABORTED: error = EINTR; break;
115 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
116 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
117 case ERROR_PATH_BUSY: error = EBUSY; break;
118 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
119 case ERROR_PIPE_BUSY: error = EBUSY; break;
120 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
121 case ERROR_PIPE_LISTENING: error = EPIPE; break;
122 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
123 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
124 case ERROR_READ_FAULT: error = EIO; break;
125 case ERROR_SEEK: error = EIO; break;
126 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
127 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
128 case ERROR_SHARING_VIOLATION: error = EACCES; break;
129 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
130 case ERROR_SUCCESS: BUG("err_win_to_posix() called without an error!");
131 case ERROR_SWAPERROR: error = ENOENT; break;
132 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
133 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
134 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
135 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
136 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
137 case ERROR_WRITE_FAULT: error = EIO; break;
138 case ERROR_WRITE_PROTECT: error = EROFS; break;
139 }
140 return error;
141 }
142
143 static inline int is_file_in_use_error(DWORD errcode)
144 {
145 switch (errcode) {
146 case ERROR_SHARING_VIOLATION:
147 case ERROR_ACCESS_DENIED:
148 return 1;
149 }
150
151 return 0;
152 }
153
154 static int read_yes_no_answer(void)
155 {
156 char answer[1024];
157
158 if (fgets(answer, sizeof(answer), stdin)) {
159 size_t answer_len = strlen(answer);
160 int got_full_line = 0, c;
161
162 /* remove the newline */
163 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
164 answer[answer_len-2] = '\0';
165 got_full_line = 1;
166 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
167 answer[answer_len-1] = '\0';
168 got_full_line = 1;
169 }
170 /* flush the buffer in case we did not get the full line */
171 if (!got_full_line)
172 while ((c = getchar()) != EOF && c != '\n')
173 ;
174 } else
175 /* we could not read, return the
176 * default answer which is no */
177 return 0;
178
179 if (tolower(answer[0]) == 'y' && !answer[1])
180 return 1;
181 if (!strncasecmp(answer, "yes", sizeof(answer)))
182 return 1;
183 if (tolower(answer[0]) == 'n' && !answer[1])
184 return 0;
185 if (!strncasecmp(answer, "no", sizeof(answer)))
186 return 0;
187
188 /* did not find an answer we understand */
189 return -1;
190 }
191
192 static int ask_yes_no_if_possible(const char *format, ...)
193 {
194 char question[4096];
195 const char *retry_hook[] = { NULL, NULL, NULL };
196 va_list args;
197
198 va_start(args, format);
199 vsnprintf(question, sizeof(question), format, args);
200 va_end(args);
201
202 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
203 retry_hook[1] = question;
204 return !run_command_v_opt(retry_hook, 0);
205 }
206
207 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
208 return 0;
209
210 while (1) {
211 int answer;
212 fprintf(stderr, "%s (y/n) ", question);
213
214 if ((answer = read_yes_no_answer()) >= 0)
215 return answer;
216
217 fprintf(stderr, "Sorry, I did not understand your answer. "
218 "Please type 'y' or 'n'\n");
219 }
220 }
221
222 /* Windows only */
223 enum hide_dotfiles_type {
224 HIDE_DOTFILES_FALSE = 0,
225 HIDE_DOTFILES_TRUE,
226 HIDE_DOTFILES_DOTGITONLY
227 };
228
229 static int core_restrict_inherited_handles = -1;
230 static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
231 static char *unset_environment_variables;
232
233 int mingw_core_config(const char *var, const char *value, void *cb)
234 {
235 if (!strcmp(var, "core.hidedotfiles")) {
236 if (value && !strcasecmp(value, "dotgitonly"))
237 hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
238 else
239 hide_dotfiles = git_config_bool(var, value);
240 return 0;
241 }
242
243 if (!strcmp(var, "core.unsetenvvars")) {
244 free(unset_environment_variables);
245 unset_environment_variables = xstrdup(value);
246 return 0;
247 }
248
249 if (!strcmp(var, "core.restrictinheritedhandles")) {
250 if (value && !strcasecmp(value, "auto"))
251 core_restrict_inherited_handles = -1;
252 else
253 core_restrict_inherited_handles =
254 git_config_bool(var, value);
255 return 0;
256 }
257
258 return 0;
259 }
260
261 /* Normalizes NT paths as returned by some low-level APIs. */
262 static wchar_t *normalize_ntpath(wchar_t *wbuf)
263 {
264 int i;
265 /* fix absolute path prefixes */
266 if (wbuf[0] == '\\') {
267 /* strip NT namespace prefixes */
268 if (!wcsncmp(wbuf, L"\\??\\", 4) ||
269 !wcsncmp(wbuf, L"\\\\?\\", 4))
270 wbuf += 4;
271 else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
272 wbuf += 12;
273 /* replace remaining '...UNC\' with '\\' */
274 if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
275 wbuf += 2;
276 *wbuf = '\\';
277 }
278 }
279 /* convert backslashes to slashes */
280 for (i = 0; wbuf[i]; i++)
281 if (wbuf[i] == '\\')
282 wbuf[i] = '/';
283 return wbuf;
284 }
285
286 int mingw_unlink(const char *pathname)
287 {
288 int ret, tries = 0;
289 wchar_t wpathname[MAX_PATH];
290 if (xutftowcs_path(wpathname, pathname) < 0)
291 return -1;
292
293 if (DeleteFileW(wpathname))
294 return 0;
295
296 /* read-only files cannot be removed */
297 _wchmod(wpathname, 0666);
298 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
299 if (!is_file_in_use_error(GetLastError()))
300 break;
301 /*
302 * We assume that some other process had the source or
303 * destination file open at the wrong moment and retry.
304 * In order to give the other process a higher chance to
305 * complete its operation, we give up our time slice now.
306 * If we have to retry again, we do sleep a bit.
307 */
308 Sleep(delay[tries]);
309 tries++;
310 }
311 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
312 ask_yes_no_if_possible("Unlink of file '%s' failed. "
313 "Should I try again?", pathname))
314 ret = _wunlink(wpathname);
315 return ret;
316 }
317
318 static int is_dir_empty(const wchar_t *wpath)
319 {
320 WIN32_FIND_DATAW findbuf;
321 HANDLE handle;
322 wchar_t wbuf[MAX_PATH + 2];
323 wcscpy(wbuf, wpath);
324 wcscat(wbuf, L"\\*");
325 handle = FindFirstFileW(wbuf, &findbuf);
326 if (handle == INVALID_HANDLE_VALUE)
327 return GetLastError() == ERROR_NO_MORE_FILES;
328
329 while (!wcscmp(findbuf.cFileName, L".") ||
330 !wcscmp(findbuf.cFileName, L".."))
331 if (!FindNextFileW(handle, &findbuf)) {
332 DWORD err = GetLastError();
333 FindClose(handle);
334 return err == ERROR_NO_MORE_FILES;
335 }
336 FindClose(handle);
337 return 0;
338 }
339
340 int mingw_rmdir(const char *pathname)
341 {
342 int ret, tries = 0;
343 wchar_t wpathname[MAX_PATH];
344 if (xutftowcs_path(wpathname, pathname) < 0)
345 return -1;
346
347 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
348 if (!is_file_in_use_error(GetLastError()))
349 errno = err_win_to_posix(GetLastError());
350 if (errno != EACCES)
351 break;
352 if (!is_dir_empty(wpathname)) {
353 errno = ENOTEMPTY;
354 break;
355 }
356 /*
357 * We assume that some other process had the source or
358 * destination file open at the wrong moment and retry.
359 * In order to give the other process a higher chance to
360 * complete its operation, we give up our time slice now.
361 * If we have to retry again, we do sleep a bit.
362 */
363 Sleep(delay[tries]);
364 tries++;
365 }
366 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
367 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
368 "Should I try again?", pathname))
369 ret = _wrmdir(wpathname);
370 return ret;
371 }
372
373 static inline int needs_hiding(const char *path)
374 {
375 const char *basename;
376
377 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
378 return 0;
379
380 /* We cannot use basename(), as it would remove trailing slashes */
381 win32_skip_dos_drive_prefix((char **)&path);
382 if (!*path)
383 return 0;
384
385 for (basename = path; *path; path++)
386 if (is_dir_sep(*path)) {
387 do {
388 path++;
389 } while (is_dir_sep(*path));
390 /* ignore trailing slashes */
391 if (*path)
392 basename = path;
393 else
394 break;
395 }
396
397 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
398 return *basename == '.';
399
400 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
401 return !strncasecmp(".git", basename, 4) &&
402 (!basename[4] || is_dir_sep(basename[4]));
403 }
404
405 static int set_hidden_flag(const wchar_t *path, int set)
406 {
407 DWORD original = GetFileAttributesW(path), modified;
408 if (set)
409 modified = original | FILE_ATTRIBUTE_HIDDEN;
410 else
411 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
412 if (original == modified || SetFileAttributesW(path, modified))
413 return 0;
414 errno = err_win_to_posix(GetLastError());
415 return -1;
416 }
417
418 int mingw_mkdir(const char *path, int mode)
419 {
420 int ret;
421 wchar_t wpath[MAX_PATH];
422
423 if (!is_valid_win32_path(path, 0)) {
424 errno = EINVAL;
425 return -1;
426 }
427
428 if (xutftowcs_path(wpath, path) < 0)
429 return -1;
430 ret = _wmkdir(wpath);
431 if (!ret && needs_hiding(path))
432 return set_hidden_flag(wpath, 1);
433 return ret;
434 }
435
436 /*
437 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
438 * is documented in [1] as opening a writable file handle in append mode.
439 * (It is believed that) this is atomic since it is maintained by the
440 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
441 *
442 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
443 *
444 * This trick does not appear to work for named pipes. Instead it creates
445 * a named pipe client handle that cannot be written to. Callers should
446 * just use the regular _wopen() for them. (And since client handle gets
447 * bound to a unique server handle, it isn't really an issue.)
448 */
449 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
450 {
451 HANDLE handle;
452 int fd;
453 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
454
455 /* only these flags are supported */
456 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
457 return errno = ENOSYS, -1;
458
459 /*
460 * FILE_SHARE_WRITE is required to permit child processes
461 * to append to the file.
462 */
463 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
464 FILE_SHARE_WRITE | FILE_SHARE_READ,
465 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
466 if (handle == INVALID_HANDLE_VALUE) {
467 DWORD err = GetLastError();
468
469 /*
470 * Some network storage solutions (e.g. Isilon) might return
471 * ERROR_INVALID_PARAMETER instead of expected error
472 * ERROR_PATH_NOT_FOUND, which results in an unknown error. If
473 * so, let's turn the error to ERROR_PATH_NOT_FOUND instead.
474 */
475 if (err == ERROR_INVALID_PARAMETER)
476 err = ERROR_PATH_NOT_FOUND;
477
478 errno = err_win_to_posix(err);
479 return -1;
480 }
481
482 /*
483 * No O_APPEND here, because the CRT uses it only to reset the
484 * file pointer to EOF before each write(); but that is not
485 * necessary (and may lead to races) for a file created with
486 * FILE_APPEND_DATA.
487 */
488 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
489 if (fd < 0)
490 CloseHandle(handle);
491 return fd;
492 }
493
494 /*
495 * Does the pathname map to the local named pipe filesystem?
496 * That is, does it have a "//./pipe/" prefix?
497 */
498 static int is_local_named_pipe_path(const char *filename)
499 {
500 return (is_dir_sep(filename[0]) &&
501 is_dir_sep(filename[1]) &&
502 filename[2] == '.' &&
503 is_dir_sep(filename[3]) &&
504 !strncasecmp(filename+4, "pipe", 4) &&
505 is_dir_sep(filename[8]) &&
506 filename[9]);
507 }
508
509 int mingw_open (const char *filename, int oflags, ...)
510 {
511 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
512 va_list args;
513 unsigned mode;
514 int fd, create = (oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
515 wchar_t wfilename[MAX_PATH];
516 open_fn_t open_fn;
517
518 va_start(args, oflags);
519 mode = va_arg(args, int);
520 va_end(args);
521
522 if (!is_valid_win32_path(filename, !create)) {
523 errno = create ? EINVAL : ENOENT;
524 return -1;
525 }
526
527 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
528 open_fn = mingw_open_append;
529 else
530 open_fn = _wopen;
531
532 if (filename && !strcmp(filename, "/dev/null"))
533 wcscpy(wfilename, L"nul");
534 else if (xutftowcs_path(wfilename, filename) < 0)
535 return -1;
536
537 fd = open_fn(wfilename, oflags, mode);
538
539 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
540 DWORD attrs = GetFileAttributesW(wfilename);
541 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
542 errno = EISDIR;
543 }
544 if ((oflags & O_CREAT) && needs_hiding(filename)) {
545 /*
546 * Internally, _wopen() uses the CreateFile() API which errors
547 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
548 * specified and an already existing file's attributes do not
549 * match *exactly*. As there is no mode or flag we can set that
550 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
551 * again *without* the O_CREAT flag (that corresponds to the
552 * CREATE_ALWAYS flag of CreateFile()).
553 */
554 if (fd < 0 && errno == EACCES)
555 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
556 if (fd >= 0 && set_hidden_flag(wfilename, 1))
557 warning("could not mark '%s' as hidden.", filename);
558 }
559 return fd;
560 }
561
562 static BOOL WINAPI ctrl_ignore(DWORD type)
563 {
564 return TRUE;
565 }
566
567 #undef fgetc
568 int mingw_fgetc(FILE *stream)
569 {
570 int ch;
571 if (!isatty(_fileno(stream)))
572 return fgetc(stream);
573
574 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
575 while (1) {
576 ch = fgetc(stream);
577 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
578 break;
579
580 /* Ctrl+C was pressed, simulate SIGINT and retry */
581 mingw_raise(SIGINT);
582 }
583 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
584 return ch;
585 }
586
587 #undef fopen
588 FILE *mingw_fopen (const char *filename, const char *otype)
589 {
590 int hide = needs_hiding(filename);
591 FILE *file;
592 wchar_t wfilename[MAX_PATH], wotype[4];
593 if (filename && !strcmp(filename, "/dev/null"))
594 wcscpy(wfilename, L"nul");
595 else if (!is_valid_win32_path(filename, 1)) {
596 int create = otype && strchr(otype, 'w');
597 errno = create ? EINVAL : ENOENT;
598 return NULL;
599 } else if (xutftowcs_path(wfilename, filename) < 0)
600 return NULL;
601
602 if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
603 return NULL;
604
605 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
606 error("could not unhide %s", filename);
607 return NULL;
608 }
609 file = _wfopen(wfilename, wotype);
610 if (!file && GetLastError() == ERROR_INVALID_NAME)
611 errno = ENOENT;
612 if (file && hide && set_hidden_flag(wfilename, 1))
613 warning("could not mark '%s' as hidden.", filename);
614 return file;
615 }
616
617 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
618 {
619 int hide = needs_hiding(filename);
620 FILE *file;
621 wchar_t wfilename[MAX_PATH], wotype[4];
622 if (filename && !strcmp(filename, "/dev/null"))
623 wcscpy(wfilename, L"nul");
624 else if (!is_valid_win32_path(filename, 1)) {
625 int create = otype && strchr(otype, 'w');
626 errno = create ? EINVAL : ENOENT;
627 return NULL;
628 } else if (xutftowcs_path(wfilename, filename) < 0)
629 return NULL;
630
631 if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
632 return NULL;
633
634 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
635 error("could not unhide %s", filename);
636 return NULL;
637 }
638 file = _wfreopen(wfilename, wotype, stream);
639 if (file && hide && set_hidden_flag(wfilename, 1))
640 warning("could not mark '%s' as hidden.", filename);
641 return file;
642 }
643
644 #undef fflush
645 int mingw_fflush(FILE *stream)
646 {
647 int ret = fflush(stream);
648
649 /*
650 * write() is used behind the scenes of stdio output functions.
651 * Since git code does not check for errors after each stdio write
652 * operation, it can happen that write() is called by a later
653 * stdio function even if an earlier write() call failed. In the
654 * case of a pipe whose readable end was closed, only the first
655 * call to write() reports EPIPE on Windows. Subsequent write()
656 * calls report EINVAL. It is impossible to notice whether this
657 * fflush invocation triggered such a case, therefore, we have to
658 * catch all EINVAL errors whole-sale.
659 */
660 if (ret && errno == EINVAL)
661 errno = EPIPE;
662
663 return ret;
664 }
665
666 #undef write
667 ssize_t mingw_write(int fd, const void *buf, size_t len)
668 {
669 ssize_t result = write(fd, buf, len);
670
671 if (result < 0 && errno == EINVAL && buf) {
672 /* check if fd is a pipe */
673 HANDLE h = (HANDLE) _get_osfhandle(fd);
674 if (GetFileType(h) == FILE_TYPE_PIPE)
675 errno = EPIPE;
676 else
677 errno = EINVAL;
678 }
679
680 return result;
681 }
682
683 int mingw_access(const char *filename, int mode)
684 {
685 wchar_t wfilename[MAX_PATH];
686 if (xutftowcs_path(wfilename, filename) < 0)
687 return -1;
688 /* X_OK is not supported by the MSVCRT version */
689 return _waccess(wfilename, mode & ~X_OK);
690 }
691
692 int mingw_chdir(const char *dirname)
693 {
694 wchar_t wdirname[MAX_PATH];
695 if (xutftowcs_path(wdirname, dirname) < 0)
696 return -1;
697 return _wchdir(wdirname);
698 }
699
700 int mingw_chmod(const char *filename, int mode)
701 {
702 wchar_t wfilename[MAX_PATH];
703 if (xutftowcs_path(wfilename, filename) < 0)
704 return -1;
705 return _wchmod(wfilename, mode);
706 }
707
708 /*
709 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
710 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
711 */
712 static inline long long filetime_to_hnsec(const FILETIME *ft)
713 {
714 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
715 /* Windows to Unix Epoch conversion */
716 return winTime - 116444736000000000LL;
717 }
718
719 static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
720 {
721 long long hnsec = filetime_to_hnsec(ft);
722 ts->tv_sec = (time_t)(hnsec / 10000000);
723 ts->tv_nsec = (hnsec % 10000000) * 100;
724 }
725
726 /**
727 * Verifies that safe_create_leading_directories() would succeed.
728 */
729 static int has_valid_directory_prefix(wchar_t *wfilename)
730 {
731 int n = wcslen(wfilename);
732
733 while (n > 0) {
734 wchar_t c = wfilename[--n];
735 DWORD attributes;
736
737 if (!is_dir_sep(c))
738 continue;
739
740 wfilename[n] = L'\0';
741 attributes = GetFileAttributesW(wfilename);
742 wfilename[n] = c;
743 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
744 attributes == FILE_ATTRIBUTE_DEVICE)
745 return 1;
746 if (attributes == INVALID_FILE_ATTRIBUTES)
747 switch (GetLastError()) {
748 case ERROR_PATH_NOT_FOUND:
749 continue;
750 case ERROR_FILE_NOT_FOUND:
751 /* This implies parent directory exists. */
752 return 1;
753 }
754 return 0;
755 }
756 return 1;
757 }
758
759 /* We keep the do_lstat code in a separate function to avoid recursion.
760 * When a path ends with a slash, the stat will fail with ENOENT. In
761 * this case, we strip the trailing slashes and stat again.
762 *
763 * If follow is true then act like stat() and report on the link
764 * target. Otherwise report on the link itself.
765 */
766 static int do_lstat(int follow, const char *file_name, struct stat *buf)
767 {
768 WIN32_FILE_ATTRIBUTE_DATA fdata;
769 wchar_t wfilename[MAX_PATH];
770 if (xutftowcs_path(wfilename, file_name) < 0)
771 return -1;
772
773 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
774 buf->st_ino = 0;
775 buf->st_gid = 0;
776 buf->st_uid = 0;
777 buf->st_nlink = 1;
778 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
779 buf->st_size = fdata.nFileSizeLow |
780 (((off_t)fdata.nFileSizeHigh)<<32);
781 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
782 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
783 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
784 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
785 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
786 WIN32_FIND_DATAW findbuf;
787 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
788 if (handle != INVALID_HANDLE_VALUE) {
789 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
790 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
791 if (follow) {
792 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
793 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
794 } else {
795 buf->st_mode = S_IFLNK;
796 }
797 buf->st_mode |= S_IREAD;
798 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
799 buf->st_mode |= S_IWRITE;
800 }
801 FindClose(handle);
802 }
803 }
804 return 0;
805 }
806 switch (GetLastError()) {
807 case ERROR_ACCESS_DENIED:
808 case ERROR_SHARING_VIOLATION:
809 case ERROR_LOCK_VIOLATION:
810 case ERROR_SHARING_BUFFER_EXCEEDED:
811 errno = EACCES;
812 break;
813 case ERROR_BUFFER_OVERFLOW:
814 errno = ENAMETOOLONG;
815 break;
816 case ERROR_NOT_ENOUGH_MEMORY:
817 errno = ENOMEM;
818 break;
819 case ERROR_PATH_NOT_FOUND:
820 if (!has_valid_directory_prefix(wfilename)) {
821 errno = ENOTDIR;
822 break;
823 }
824 /* fallthru */
825 default:
826 errno = ENOENT;
827 break;
828 }
829 return -1;
830 }
831
832 /* We provide our own lstat/fstat functions, since the provided
833 * lstat/fstat functions are so slow. These stat functions are
834 * tailored for Git's usage (read: fast), and are not meant to be
835 * complete. Note that Git stat()s are redirected to mingw_lstat()
836 * too, since Windows doesn't really handle symlinks that well.
837 */
838 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
839 {
840 int namelen;
841 char alt_name[PATH_MAX];
842
843 if (!do_lstat(follow, file_name, buf))
844 return 0;
845
846 /* if file_name ended in a '/', Windows returned ENOENT;
847 * try again without trailing slashes
848 */
849 if (errno != ENOENT)
850 return -1;
851
852 namelen = strlen(file_name);
853 if (namelen && file_name[namelen-1] != '/')
854 return -1;
855 while (namelen && file_name[namelen-1] == '/')
856 --namelen;
857 if (!namelen || namelen >= PATH_MAX)
858 return -1;
859
860 memcpy(alt_name, file_name, namelen);
861 alt_name[namelen] = 0;
862 return do_lstat(follow, alt_name, buf);
863 }
864
865 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
866 {
867 BY_HANDLE_FILE_INFORMATION fdata;
868
869 if (!GetFileInformationByHandle(hnd, &fdata)) {
870 errno = err_win_to_posix(GetLastError());
871 return -1;
872 }
873
874 buf->st_ino = 0;
875 buf->st_gid = 0;
876 buf->st_uid = 0;
877 buf->st_nlink = 1;
878 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
879 buf->st_size = fdata.nFileSizeLow |
880 (((off_t)fdata.nFileSizeHigh)<<32);
881 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
882 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
883 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
884 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
885 return 0;
886 }
887
888 int mingw_lstat(const char *file_name, struct stat *buf)
889 {
890 return do_stat_internal(0, file_name, buf);
891 }
892 int mingw_stat(const char *file_name, struct stat *buf)
893 {
894 return do_stat_internal(1, file_name, buf);
895 }
896
897 int mingw_fstat(int fd, struct stat *buf)
898 {
899 HANDLE fh = (HANDLE)_get_osfhandle(fd);
900 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
901
902 switch (type) {
903 case FILE_TYPE_DISK:
904 return get_file_info_by_handle(fh, buf);
905
906 case FILE_TYPE_CHAR:
907 case FILE_TYPE_PIPE:
908 /* initialize stat fields */
909 memset(buf, 0, sizeof(*buf));
910 buf->st_nlink = 1;
911
912 if (type == FILE_TYPE_CHAR) {
913 buf->st_mode = _S_IFCHR;
914 } else {
915 buf->st_mode = _S_IFIFO;
916 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
917 buf->st_size = avail;
918 }
919 return 0;
920
921 default:
922 errno = EBADF;
923 return -1;
924 }
925 }
926
927 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
928 {
929 long long winTime = t * 10000000LL + 116444736000000000LL;
930 ft->dwLowDateTime = winTime;
931 ft->dwHighDateTime = winTime >> 32;
932 }
933
934 int mingw_utime (const char *file_name, const struct utimbuf *times)
935 {
936 FILETIME mft, aft;
937 int fh, rc;
938 DWORD attrs;
939 wchar_t wfilename[MAX_PATH];
940 if (xutftowcs_path(wfilename, file_name) < 0)
941 return -1;
942
943 /* must have write permission */
944 attrs = GetFileAttributesW(wfilename);
945 if (attrs != INVALID_FILE_ATTRIBUTES &&
946 (attrs & FILE_ATTRIBUTE_READONLY)) {
947 /* ignore errors here; open() will report them */
948 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
949 }
950
951 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
952 rc = -1;
953 goto revert_attrs;
954 }
955
956 if (times) {
957 time_t_to_filetime(times->modtime, &mft);
958 time_t_to_filetime(times->actime, &aft);
959 } else {
960 GetSystemTimeAsFileTime(&mft);
961 aft = mft;
962 }
963 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
964 errno = EINVAL;
965 rc = -1;
966 } else
967 rc = 0;
968 close(fh);
969
970 revert_attrs:
971 if (attrs != INVALID_FILE_ATTRIBUTES &&
972 (attrs & FILE_ATTRIBUTE_READONLY)) {
973 /* ignore errors again */
974 SetFileAttributesW(wfilename, attrs);
975 }
976 return rc;
977 }
978
979 #undef strftime
980 size_t mingw_strftime(char *s, size_t max,
981 const char *format, const struct tm *tm)
982 {
983 /* a pointer to the original strftime in case we can't find the UCRT version */
984 static size_t (*fallback)(char *, size_t, const char *, const struct tm *) = strftime;
985 size_t ret;
986 DECLARE_PROC_ADDR(ucrtbase.dll, size_t, strftime, char *, size_t,
987 const char *, const struct tm *);
988
989 if (INIT_PROC_ADDR(strftime))
990 ret = strftime(s, max, format, tm);
991 else
992 ret = fallback(s, max, format, tm);
993
994 if (!ret && errno == EINVAL)
995 die("invalid strftime format: '%s'", format);
996 return ret;
997 }
998
999 unsigned int sleep (unsigned int seconds)
1000 {
1001 Sleep(seconds*1000);
1002 return 0;
1003 }
1004
1005 char *mingw_mktemp(char *template)
1006 {
1007 wchar_t wtemplate[MAX_PATH];
1008 if (xutftowcs_path(wtemplate, template) < 0)
1009 return NULL;
1010 if (!_wmktemp(wtemplate))
1011 return NULL;
1012 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
1013 return NULL;
1014 return template;
1015 }
1016
1017 int mkstemp(char *template)
1018 {
1019 char *filename = mktemp(template);
1020 if (filename == NULL)
1021 return -1;
1022 return open(filename, O_RDWR | O_CREAT, 0600);
1023 }
1024
1025 int gettimeofday(struct timeval *tv, void *tz)
1026 {
1027 FILETIME ft;
1028 long long hnsec;
1029
1030 GetSystemTimeAsFileTime(&ft);
1031 hnsec = filetime_to_hnsec(&ft);
1032 tv->tv_sec = hnsec / 10000000;
1033 tv->tv_usec = (hnsec % 10000000) / 10;
1034 return 0;
1035 }
1036
1037 int pipe(int filedes[2])
1038 {
1039 HANDLE h[2];
1040
1041 /* this creates non-inheritable handles */
1042 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
1043 errno = err_win_to_posix(GetLastError());
1044 return -1;
1045 }
1046 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
1047 if (filedes[0] < 0) {
1048 CloseHandle(h[0]);
1049 CloseHandle(h[1]);
1050 return -1;
1051 }
1052 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
1053 if (filedes[1] < 0) {
1054 close(filedes[0]);
1055 CloseHandle(h[1]);
1056 return -1;
1057 }
1058 return 0;
1059 }
1060
1061 struct tm *gmtime_r(const time_t *timep, struct tm *result)
1062 {
1063 if (gmtime_s(result, timep) == 0)
1064 return result;
1065 return NULL;
1066 }
1067
1068 struct tm *localtime_r(const time_t *timep, struct tm *result)
1069 {
1070 if (localtime_s(result, timep) == 0)
1071 return result;
1072 return NULL;
1073 }
1074
1075 char *mingw_getcwd(char *pointer, int len)
1076 {
1077 wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
1078 DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
1079
1080 if (!ret || ret >= ARRAY_SIZE(cwd)) {
1081 errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
1082 return NULL;
1083 }
1084 ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
1085 if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
1086 HANDLE hnd = CreateFileW(cwd, 0,
1087 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
1088 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
1089 if (hnd == INVALID_HANDLE_VALUE)
1090 return NULL;
1091 ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
1092 CloseHandle(hnd);
1093 if (!ret || ret >= ARRAY_SIZE(wpointer))
1094 return NULL;
1095 if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
1096 return NULL;
1097 return pointer;
1098 }
1099 if (!ret || ret >= ARRAY_SIZE(wpointer))
1100 return NULL;
1101 if (xwcstoutf(pointer, wpointer, len) < 0)
1102 return NULL;
1103 convert_slashes(pointer);
1104 return pointer;
1105 }
1106
1107 /*
1108 * See "Parsing C++ Command-Line Arguments" at Microsoft's Docs:
1109 * https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
1110 */
1111 static const char *quote_arg_msvc(const char *arg)
1112 {
1113 /* count chars to quote */
1114 int len = 0, n = 0;
1115 int force_quotes = 0;
1116 char *q, *d;
1117 const char *p = arg;
1118 if (!*p) force_quotes = 1;
1119 while (*p) {
1120 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1121 force_quotes = 1;
1122 else if (*p == '"')
1123 n++;
1124 else if (*p == '\\') {
1125 int count = 0;
1126 while (*p == '\\') {
1127 count++;
1128 p++;
1129 len++;
1130 }
1131 if (*p == '"' || !*p)
1132 n += count*2 + 1;
1133 continue;
1134 }
1135 len++;
1136 p++;
1137 }
1138 if (!force_quotes && n == 0)
1139 return arg;
1140
1141 /* insert \ where necessary */
1142 d = q = xmalloc(st_add3(len, n, 3));
1143 *d++ = '"';
1144 while (*arg) {
1145 if (*arg == '"')
1146 *d++ = '\\';
1147 else if (*arg == '\\') {
1148 int count = 0;
1149 while (*arg == '\\') {
1150 count++;
1151 *d++ = *arg++;
1152 }
1153 if (*arg == '"' || !*arg) {
1154 while (count-- > 0)
1155 *d++ = '\\';
1156 /* don't escape the surrounding end quote */
1157 if (!*arg)
1158 break;
1159 *d++ = '\\';
1160 }
1161 }
1162 *d++ = *arg++;
1163 }
1164 *d++ = '"';
1165 *d++ = '\0';
1166 return q;
1167 }
1168
1169 #include "quote.h"
1170
1171 static const char *quote_arg_msys2(const char *arg)
1172 {
1173 struct strbuf buf = STRBUF_INIT;
1174 const char *p2 = arg, *p;
1175
1176 for (p = arg; *p; p++) {
1177 int ws = isspace(*p);
1178 if (!ws && *p != '\\' && *p != '"' && *p != '{' && *p != '\'' &&
1179 *p != '?' && *p != '*' && *p != '~')
1180 continue;
1181 if (!buf.len)
1182 strbuf_addch(&buf, '"');
1183 if (p != p2)
1184 strbuf_add(&buf, p2, p - p2);
1185 if (*p == '\\' || *p == '"')
1186 strbuf_addch(&buf, '\\');
1187 p2 = p;
1188 }
1189
1190 if (p == arg)
1191 strbuf_addch(&buf, '"');
1192 else if (!buf.len)
1193 return arg;
1194 else
1195 strbuf_add(&buf, p2, p - p2);
1196
1197 strbuf_addch(&buf, '"');
1198 return strbuf_detach(&buf, 0);
1199 }
1200
1201 static const char *parse_interpreter(const char *cmd)
1202 {
1203 static char buf[100];
1204 char *p, *opt;
1205 int n, fd;
1206
1207 /* don't even try a .exe */
1208 n = strlen(cmd);
1209 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1210 return NULL;
1211
1212 fd = open(cmd, O_RDONLY);
1213 if (fd < 0)
1214 return NULL;
1215 n = read(fd, buf, sizeof(buf)-1);
1216 close(fd);
1217 if (n < 4) /* at least '#!/x' and not error */
1218 return NULL;
1219
1220 if (buf[0] != '#' || buf[1] != '!')
1221 return NULL;
1222 buf[n] = '\0';
1223 p = buf + strcspn(buf, "\r\n");
1224 if (!*p)
1225 return NULL;
1226
1227 *p = '\0';
1228 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1229 return NULL;
1230 /* strip options */
1231 if ((opt = strchr(p+1, ' ')))
1232 *opt = '\0';
1233 return p+1;
1234 }
1235
1236 /*
1237 * exe_only means that we only want to detect .exe files, but not scripts
1238 * (which do not have an extension)
1239 */
1240 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1241 int isexe, int exe_only)
1242 {
1243 char path[MAX_PATH];
1244 wchar_t wpath[MAX_PATH];
1245 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1246
1247 if (xutftowcs_path(wpath, path) < 0)
1248 return NULL;
1249
1250 if (!isexe && _waccess(wpath, F_OK) == 0)
1251 return xstrdup(path);
1252 wpath[wcslen(wpath)-4] = '\0';
1253 if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
1254 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
1255 path[strlen(path)-4] = '\0';
1256 return xstrdup(path);
1257 }
1258 }
1259 return NULL;
1260 }
1261
1262 /*
1263 * Determines the absolute path of cmd using the split path in path.
1264 * If cmd contains a slash or backslash, no lookup is performed.
1265 */
1266 static char *path_lookup(const char *cmd, int exe_only)
1267 {
1268 const char *path;
1269 char *prog = NULL;
1270 int len = strlen(cmd);
1271 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1272
1273 if (strpbrk(cmd, "/\\"))
1274 return xstrdup(cmd);
1275
1276 path = mingw_getenv("PATH");
1277 if (!path)
1278 return NULL;
1279
1280 while (!prog) {
1281 const char *sep = strchrnul(path, ';');
1282 int dirlen = sep - path;
1283 if (dirlen)
1284 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1285 if (!*sep)
1286 break;
1287 path = sep + 1;
1288 }
1289
1290 return prog;
1291 }
1292
1293 static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c)
1294 {
1295 while (*s && *s != c)
1296 s++;
1297 return s;
1298 }
1299
1300 /* Compare only keys */
1301 static int wenvcmp(const void *a, const void *b)
1302 {
1303 wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b;
1304 size_t p_len, q_len;
1305
1306 /* Find the keys */
1307 p_len = wcschrnul(p, L'=') - p;
1308 q_len = wcschrnul(q, L'=') - q;
1309
1310 /* If the length differs, include the shorter key's NUL */
1311 if (p_len < q_len)
1312 p_len++;
1313 else if (p_len > q_len)
1314 p_len = q_len + 1;
1315
1316 return _wcsnicmp(p, q, p_len);
1317 }
1318
1319 /*
1320 * Build an environment block combining the inherited environment
1321 * merged with the given list of settings.
1322 *
1323 * Values of the form "KEY=VALUE" in deltaenv override inherited values.
1324 * Values of the form "KEY" in deltaenv delete inherited values.
1325 *
1326 * Multiple entries in deltaenv for the same key are explicitly allowed.
1327 *
1328 * We return a contiguous block of UNICODE strings with a final trailing
1329 * zero word.
1330 */
1331 static wchar_t *make_environment_block(char **deltaenv)
1332 {
1333 wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p;
1334 size_t wlen, s, delta_size, size;
1335
1336 wchar_t **array = NULL;
1337 size_t alloc = 0, nr = 0, i;
1338
1339 size = 1; /* for extra NUL at the end */
1340
1341 /* If there is no deltaenv to apply, simply return a copy. */
1342 if (!deltaenv || !*deltaenv) {
1343 for (p = wenv; p && *p; ) {
1344 size_t s = wcslen(p) + 1;
1345 size += s;
1346 p += s;
1347 }
1348
1349 ALLOC_ARRAY(result, size);
1350 COPY_ARRAY(result, wenv, size);
1351 FreeEnvironmentStringsW(wenv);
1352 return result;
1353 }
1354
1355 /*
1356 * If there is a deltaenv, let's accumulate all keys into `array`,
1357 * sort them using the stable git_stable_qsort() and then copy,
1358 * skipping duplicate keys
1359 */
1360 for (p = wenv; p && *p; ) {
1361 ALLOC_GROW(array, nr + 1, alloc);
1362 s = wcslen(p) + 1;
1363 array[nr++] = p;
1364 p += s;
1365 size += s;
1366 }
1367
1368 /* (over-)assess size needed for wchar version of deltaenv */
1369 for (delta_size = 0, i = 0; deltaenv[i]; i++)
1370 delta_size += strlen(deltaenv[i]) * 2 + 1;
1371 ALLOC_ARRAY(wdeltaenv, delta_size);
1372
1373 /* convert the deltaenv, appending to array */
1374 for (i = 0, p = wdeltaenv; deltaenv[i]; i++) {
1375 ALLOC_GROW(array, nr + 1, alloc);
1376 wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p);
1377 array[nr++] = p;
1378 p += wlen + 1;
1379 }
1380
1381 git_stable_qsort(array, nr, sizeof(*array), wenvcmp);
1382 ALLOC_ARRAY(result, size + delta_size);
1383
1384 for (p = result, i = 0; i < nr; i++) {
1385 /* Skip any duplicate keys; last one wins */
1386 while (i + 1 < nr && !wenvcmp(array + i, array + i + 1))
1387 i++;
1388
1389 /* Skip "to delete" entry */
1390 if (!wcschr(array[i], L'='))
1391 continue;
1392
1393 size = wcslen(array[i]) + 1;
1394 COPY_ARRAY(p, array[i], size);
1395 p += size;
1396 }
1397 *p = L'\0';
1398
1399 free(array);
1400 free(wdeltaenv);
1401 FreeEnvironmentStringsW(wenv);
1402 return result;
1403 }
1404
1405 static void do_unset_environment_variables(void)
1406 {
1407 static int done;
1408 char *p = unset_environment_variables;
1409
1410 if (done || !p)
1411 return;
1412 done = 1;
1413
1414 for (;;) {
1415 char *comma = strchr(p, ',');
1416
1417 if (comma)
1418 *comma = '\0';
1419 unsetenv(p);
1420 if (!comma)
1421 break;
1422 p = comma + 1;
1423 }
1424 }
1425
1426 struct pinfo_t {
1427 struct pinfo_t *next;
1428 pid_t pid;
1429 HANDLE proc;
1430 };
1431 static struct pinfo_t *pinfo = NULL;
1432 CRITICAL_SECTION pinfo_cs;
1433
1434 /* Used to match and chomp off path components */
1435 static inline int match_last_path_component(const char *path, size_t *len,
1436 const char *component)
1437 {
1438 size_t component_len = strlen(component);
1439 if (*len < component_len + 1 ||
1440 !is_dir_sep(path[*len - component_len - 1]) ||
1441 fspathncmp(path + *len - component_len, component, component_len))
1442 return 0;
1443 *len -= component_len + 1;
1444 /* chomp off repeated dir separators */
1445 while (*len > 0 && is_dir_sep(path[*len - 1]))
1446 (*len)--;
1447 return 1;
1448 }
1449
1450 static int is_msys2_sh(const char *cmd)
1451 {
1452 if (!cmd)
1453 return 0;
1454
1455 if (!strcmp(cmd, "sh")) {
1456 static int ret = -1;
1457 char *p;
1458
1459 if (ret >= 0)
1460 return ret;
1461
1462 p = path_lookup(cmd, 0);
1463 if (!p)
1464 ret = 0;
1465 else {
1466 size_t len = strlen(p);
1467
1468 ret = match_last_path_component(p, &len, "sh.exe") &&
1469 match_last_path_component(p, &len, "bin") &&
1470 match_last_path_component(p, &len, "usr");
1471 free(p);
1472 }
1473 return ret;
1474 }
1475
1476 if (ends_with(cmd, "\\sh.exe")) {
1477 static char *sh;
1478
1479 if (!sh)
1480 sh = path_lookup("sh", 0);
1481
1482 return !fspathcmp(cmd, sh);
1483 }
1484
1485 return 0;
1486 }
1487
1488 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1489 const char *dir,
1490 int prepend_cmd, int fhin, int fhout, int fherr)
1491 {
1492 static int restrict_handle_inheritance = -1;
1493 STARTUPINFOEXW si;
1494 PROCESS_INFORMATION pi;
1495 LPPROC_THREAD_ATTRIBUTE_LIST attr_list = NULL;
1496 HANDLE stdhandles[3];
1497 DWORD stdhandles_count = 0;
1498 SIZE_T size;
1499 struct strbuf args;
1500 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1501 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1502 BOOL ret;
1503 HANDLE cons;
1504 const char *(*quote_arg)(const char *arg) =
1505 is_msys2_sh(cmd ? cmd : *argv) ?
1506 quote_arg_msys2 : quote_arg_msvc;
1507 const char *strace_env;
1508
1509 /* Make sure to override previous errors, if any */
1510 errno = 0;
1511
1512 if (restrict_handle_inheritance < 0)
1513 restrict_handle_inheritance = core_restrict_inherited_handles;
1514 /*
1515 * The following code to restrict which handles are inherited seems
1516 * to work properly only on Windows 7 and later, so let's disable it
1517 * on Windows Vista and 2008.
1518 */
1519 if (restrict_handle_inheritance < 0)
1520 restrict_handle_inheritance = GetVersion() >> 16 >= 7601;
1521
1522 do_unset_environment_variables();
1523
1524 /* Determine whether or not we are associated to a console */
1525 cons = CreateFileW(L"CONOUT$", GENERIC_WRITE,
1526 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1527 FILE_ATTRIBUTE_NORMAL, NULL);
1528 if (cons == INVALID_HANDLE_VALUE) {
1529 /* There is no console associated with this process.
1530 * Since the child is a console process, Windows
1531 * would normally create a console window. But
1532 * since we'll be redirecting std streams, we do
1533 * not need the console.
1534 * It is necessary to use DETACHED_PROCESS
1535 * instead of CREATE_NO_WINDOW to make ssh
1536 * recognize that it has no console.
1537 */
1538 flags |= DETACHED_PROCESS;
1539 } else {
1540 /* There is already a console. If we specified
1541 * DETACHED_PROCESS here, too, Windows would
1542 * disassociate the child from the console.
1543 * The same is true for CREATE_NO_WINDOW.
1544 * Go figure!
1545 */
1546 CloseHandle(cons);
1547 }
1548 memset(&si, 0, sizeof(si));
1549 si.StartupInfo.cb = sizeof(si);
1550 si.StartupInfo.hStdInput = winansi_get_osfhandle(fhin);
1551 si.StartupInfo.hStdOutput = winansi_get_osfhandle(fhout);
1552 si.StartupInfo.hStdError = winansi_get_osfhandle(fherr);
1553
1554 /* The list of handles cannot contain duplicates */
1555 if (si.StartupInfo.hStdInput != INVALID_HANDLE_VALUE)
1556 stdhandles[stdhandles_count++] = si.StartupInfo.hStdInput;
1557 if (si.StartupInfo.hStdOutput != INVALID_HANDLE_VALUE &&
1558 si.StartupInfo.hStdOutput != si.StartupInfo.hStdInput)
1559 stdhandles[stdhandles_count++] = si.StartupInfo.hStdOutput;
1560 if (si.StartupInfo.hStdError != INVALID_HANDLE_VALUE &&
1561 si.StartupInfo.hStdError != si.StartupInfo.hStdInput &&
1562 si.StartupInfo.hStdError != si.StartupInfo.hStdOutput)
1563 stdhandles[stdhandles_count++] = si.StartupInfo.hStdError;
1564 if (stdhandles_count)
1565 si.StartupInfo.dwFlags |= STARTF_USESTDHANDLES;
1566
1567 if (*argv && !strcmp(cmd, *argv))
1568 wcmd[0] = L'\0';
1569 else if (xutftowcs_path(wcmd, cmd) < 0)
1570 return -1;
1571 if (dir && xutftowcs_path(wdir, dir) < 0)
1572 return -1;
1573
1574 /* concatenate argv, quoting args as we go */
1575 strbuf_init(&args, 0);
1576 if (prepend_cmd) {
1577 char *quoted = (char *)quote_arg(cmd);
1578 strbuf_addstr(&args, quoted);
1579 if (quoted != cmd)
1580 free(quoted);
1581 }
1582 for (; *argv; argv++) {
1583 char *quoted = (char *)quote_arg(*argv);
1584 if (*args.buf)
1585 strbuf_addch(&args, ' ');
1586 strbuf_addstr(&args, quoted);
1587 if (quoted != *argv)
1588 free(quoted);
1589 }
1590
1591 strace_env = getenv("GIT_STRACE_COMMANDS");
1592 if (strace_env) {
1593 char *p = path_lookup("strace.exe", 1);
1594 if (!p)
1595 return error("strace not found!");
1596 if (xutftowcs_path(wcmd, p) < 0) {
1597 free(p);
1598 return -1;
1599 }
1600 free(p);
1601 if (!strcmp("1", strace_env) ||
1602 !strcasecmp("yes", strace_env) ||
1603 !strcasecmp("true", strace_env))
1604 strbuf_insert(&args, 0, "strace ", 7);
1605 else {
1606 const char *quoted = quote_arg(strace_env);
1607 struct strbuf buf = STRBUF_INIT;
1608 strbuf_addf(&buf, "strace -o %s ", quoted);
1609 if (quoted != strace_env)
1610 free((char *)quoted);
1611 strbuf_insert(&args, 0, buf.buf, buf.len);
1612 strbuf_release(&buf);
1613 }
1614 }
1615
1616 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1617 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1618 strbuf_release(&args);
1619
1620 wenvblk = make_environment_block(deltaenv);
1621
1622 memset(&pi, 0, sizeof(pi));
1623 if (restrict_handle_inheritance && stdhandles_count &&
1624 (InitializeProcThreadAttributeList(NULL, 1, 0, &size) ||
1625 GetLastError() == ERROR_INSUFFICIENT_BUFFER) &&
1626 (attr_list = (LPPROC_THREAD_ATTRIBUTE_LIST)
1627 (HeapAlloc(GetProcessHeap(), 0, size))) &&
1628 InitializeProcThreadAttributeList(attr_list, 1, 0, &size) &&
1629 UpdateProcThreadAttribute(attr_list, 0,
1630 PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
1631 stdhandles,
1632 stdhandles_count * sizeof(HANDLE),
1633 NULL, NULL)) {
1634 si.lpAttributeList = attr_list;
1635 flags |= EXTENDED_STARTUPINFO_PRESENT;
1636 }
1637
1638 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
1639 stdhandles_count ? TRUE : FALSE,
1640 flags, wenvblk, dir ? wdir : NULL,
1641 &si.StartupInfo, &pi);
1642
1643 /*
1644 * On Windows 2008 R2, it seems that specifying certain types of handles
1645 * (such as FILE_TYPE_CHAR or FILE_TYPE_PIPE) will always produce an
1646 * error. Rather than playing finicky and fragile games, let's just try
1647 * to detect this situation and simply try again without restricting any
1648 * handle inheritance. This is still better than failing to create
1649 * processes.
1650 */
1651 if (!ret && restrict_handle_inheritance && stdhandles_count) {
1652 DWORD err = GetLastError();
1653 struct strbuf buf = STRBUF_INIT;
1654
1655 if (err != ERROR_NO_SYSTEM_RESOURCES &&
1656 /*
1657 * On Windows 7 and earlier, handles on pipes and character
1658 * devices are inherited automatically, and cannot be
1659 * specified in the thread handle list. Rather than trying
1660 * to catch each and every corner case (and running the
1661 * chance of *still* forgetting a few), let's just fall
1662 * back to creating the process without trying to limit the
1663 * handle inheritance.
1664 */
1665 !(err == ERROR_INVALID_PARAMETER &&
1666 GetVersion() >> 16 < 9200) &&
1667 !getenv("SUPPRESS_HANDLE_INHERITANCE_WARNING")) {
1668 DWORD fl = 0;
1669 int i;
1670
1671 setenv("SUPPRESS_HANDLE_INHERITANCE_WARNING", "1", 1);
1672
1673 for (i = 0; i < stdhandles_count; i++) {
1674 HANDLE h = stdhandles[i];
1675 strbuf_addf(&buf, "handle #%d: %p (type %lx, "
1676 "handle info (%d) %lx\n", i, h,
1677 GetFileType(h),
1678 GetHandleInformation(h, &fl),
1679 fl);
1680 }
1681 strbuf_addstr(&buf, "\nThis is a bug; please report it "
1682 "at\nhttps://github.com/git-for-windows/"
1683 "git/issues/new\n\n"
1684 "To suppress this warning, please set "
1685 "the environment variable\n\n"
1686 "\tSUPPRESS_HANDLE_INHERITANCE_WARNING=1"
1687 "\n");
1688 }
1689 restrict_handle_inheritance = 0;
1690 flags &= ~EXTENDED_STARTUPINFO_PRESENT;
1691 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
1692 TRUE, flags, wenvblk, dir ? wdir : NULL,
1693 &si.StartupInfo, &pi);
1694 if (!ret)
1695 errno = err_win_to_posix(GetLastError());
1696 if (ret && buf.len) {
1697 warning("failed to restrict file handles (%ld)\n\n%s",
1698 err, buf.buf);
1699 }
1700 strbuf_release(&buf);
1701 } else if (!ret)
1702 errno = err_win_to_posix(GetLastError());
1703
1704 if (si.lpAttributeList)
1705 DeleteProcThreadAttributeList(si.lpAttributeList);
1706 if (attr_list)
1707 HeapFree(GetProcessHeap(), 0, attr_list);
1708
1709 free(wenvblk);
1710 free(wargs);
1711
1712 if (!ret)
1713 return -1;
1714
1715 CloseHandle(pi.hThread);
1716
1717 /*
1718 * The process ID is the human-readable identifier of the process
1719 * that we want to present in log and error messages. The handle
1720 * is not useful for this purpose. But we cannot close it, either,
1721 * because it is not possible to turn a process ID into a process
1722 * handle after the process terminated.
1723 * Keep the handle in a list for waitpid.
1724 */
1725 EnterCriticalSection(&pinfo_cs);
1726 {
1727 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1728 info->pid = pi.dwProcessId;
1729 info->proc = pi.hProcess;
1730 info->next = pinfo;
1731 pinfo = info;
1732 }
1733 LeaveCriticalSection(&pinfo_cs);
1734
1735 return (pid_t)pi.dwProcessId;
1736 }
1737
1738 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1739 {
1740 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1741 }
1742
1743 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1744 const char *dir,
1745 int fhin, int fhout, int fherr)
1746 {
1747 pid_t pid;
1748 char *prog = path_lookup(cmd, 0);
1749
1750 if (!prog) {
1751 errno = ENOENT;
1752 pid = -1;
1753 }
1754 else {
1755 const char *interpr = parse_interpreter(prog);
1756
1757 if (interpr) {
1758 const char *argv0 = argv[0];
1759 char *iprog = path_lookup(interpr, 1);
1760 argv[0] = prog;
1761 if (!iprog) {
1762 errno = ENOENT;
1763 pid = -1;
1764 }
1765 else {
1766 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1767 fhin, fhout, fherr);
1768 free(iprog);
1769 }
1770 argv[0] = argv0;
1771 }
1772 else
1773 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1774 fhin, fhout, fherr);
1775 free(prog);
1776 }
1777 return pid;
1778 }
1779
1780 static int try_shell_exec(const char *cmd, char *const *argv)
1781 {
1782 const char *interpr = parse_interpreter(cmd);
1783 char *prog;
1784 int pid = 0;
1785
1786 if (!interpr)
1787 return 0;
1788 prog = path_lookup(interpr, 1);
1789 if (prog) {
1790 int exec_id;
1791 int argc = 0;
1792 #ifndef _MSC_VER
1793 const
1794 #endif
1795 char **argv2;
1796 while (argv[argc]) argc++;
1797 ALLOC_ARRAY(argv2, argc + 1);
1798 argv2[0] = (char *)cmd; /* full path to the script file */
1799 COPY_ARRAY(&argv2[1], &argv[1], argc);
1800 exec_id = trace2_exec(prog, argv2);
1801 pid = mingw_spawnv(prog, argv2, 1);
1802 if (pid >= 0) {
1803 int status;
1804 if (waitpid(pid, &status, 0) < 0)
1805 status = 255;
1806 trace2_exec_result(exec_id, status);
1807 exit(status);
1808 }
1809 trace2_exec_result(exec_id, -1);
1810 pid = 1; /* indicate that we tried but failed */
1811 free(prog);
1812 free(argv2);
1813 }
1814 return pid;
1815 }
1816
1817 int mingw_execv(const char *cmd, char *const *argv)
1818 {
1819 /* check if git_command is a shell script */
1820 if (!try_shell_exec(cmd, argv)) {
1821 int pid, status;
1822 int exec_id;
1823
1824 exec_id = trace2_exec(cmd, (const char **)argv);
1825 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1826 if (pid < 0) {
1827 trace2_exec_result(exec_id, -1);
1828 return -1;
1829 }
1830 if (waitpid(pid, &status, 0) < 0)
1831 status = 255;
1832 trace2_exec_result(exec_id, status);
1833 exit(status);
1834 }
1835 return -1;
1836 }
1837
1838 int mingw_execvp(const char *cmd, char *const *argv)
1839 {
1840 char *prog = path_lookup(cmd, 0);
1841
1842 if (prog) {
1843 mingw_execv(prog, argv);
1844 free(prog);
1845 } else
1846 errno = ENOENT;
1847
1848 return -1;
1849 }
1850
1851 int mingw_kill(pid_t pid, int sig)
1852 {
1853 if (pid > 0 && sig == SIGTERM) {
1854 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1855
1856 if (TerminateProcess(h, -1)) {
1857 CloseHandle(h);
1858 return 0;
1859 }
1860
1861 errno = err_win_to_posix(GetLastError());
1862 CloseHandle(h);
1863 return -1;
1864 } else if (pid > 0 && sig == 0) {
1865 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1866 if (h) {
1867 CloseHandle(h);
1868 return 0;
1869 }
1870 }
1871
1872 errno = EINVAL;
1873 return -1;
1874 }
1875
1876 /*
1877 * UTF-8 versions of getenv(), putenv() and unsetenv().
1878 * Internally, they use the CRT's stock UNICODE routines
1879 * to avoid data loss.
1880 */
1881 char *mingw_getenv(const char *name)
1882 {
1883 #define GETENV_MAX_RETAIN 64
1884 static char *values[GETENV_MAX_RETAIN];
1885 static int value_counter;
1886 int len_key, len_value;
1887 wchar_t *w_key;
1888 char *value;
1889 wchar_t w_value[32768];
1890
1891 if (!name || !*name)
1892 return NULL;
1893
1894 len_key = strlen(name) + 1;
1895 /* We cannot use xcalloc() here because that uses getenv() itself */
1896 w_key = calloc(len_key, sizeof(wchar_t));
1897 if (!w_key)
1898 die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
1899 xutftowcs(w_key, name, len_key);
1900 /* GetEnvironmentVariableW() only sets the last error upon failure */
1901 SetLastError(ERROR_SUCCESS);
1902 len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value));
1903 if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
1904 free(w_key);
1905 return NULL;
1906 }
1907 free(w_key);
1908
1909 len_value = len_value * 3 + 1;
1910 /* We cannot use xcalloc() here because that uses getenv() itself */
1911 value = calloc(len_value, sizeof(char));
1912 if (!value)
1913 die("Out of memory, (tried to allocate %u bytes)", len_value);
1914 xwcstoutf(value, w_value, len_value);
1915
1916 /*
1917 * We return `value` which is an allocated value and the caller is NOT
1918 * expecting to have to free it, so we keep a round-robin array,
1919 * invalidating the buffer after GETENV_MAX_RETAIN getenv() calls.
1920 */
1921 free(values[value_counter]);
1922 values[value_counter++] = value;
1923 if (value_counter >= ARRAY_SIZE(values))
1924 value_counter = 0;
1925
1926 return value;
1927 }
1928
1929 int mingw_putenv(const char *namevalue)
1930 {
1931 int size;
1932 wchar_t *wide, *equal;
1933 BOOL result;
1934
1935 if (!namevalue || !*namevalue)
1936 return 0;
1937
1938 size = strlen(namevalue) * 2 + 1;
1939 wide = calloc(size, sizeof(wchar_t));
1940 if (!wide)
1941 die("Out of memory, (tried to allocate %u wchar_t's)", size);
1942 xutftowcs(wide, namevalue, size);
1943 equal = wcschr(wide, L'=');
1944 if (!equal)
1945 result = SetEnvironmentVariableW(wide, NULL);
1946 else {
1947 *equal = L'\0';
1948 result = SetEnvironmentVariableW(wide, equal + 1);
1949 }
1950 free(wide);
1951
1952 if (!result)
1953 errno = err_win_to_posix(GetLastError());
1954
1955 return result ? 0 : -1;
1956 }
1957
1958 static void ensure_socket_initialization(void)
1959 {
1960 WSADATA wsa;
1961 static int initialized = 0;
1962
1963 if (initialized)
1964 return;
1965
1966 if (WSAStartup(MAKEWORD(2,2), &wsa))
1967 die("unable to initialize winsock subsystem, error %d",
1968 WSAGetLastError());
1969
1970 atexit((void(*)(void)) WSACleanup);
1971 initialized = 1;
1972 }
1973
1974 #undef gethostname
1975 int mingw_gethostname(char *name, int namelen)
1976 {
1977 ensure_socket_initialization();
1978 return gethostname(name, namelen);
1979 }
1980
1981 #undef gethostbyname
1982 struct hostent *mingw_gethostbyname(const char *host)
1983 {
1984 ensure_socket_initialization();
1985 return gethostbyname(host);
1986 }
1987
1988 #undef getaddrinfo
1989 int mingw_getaddrinfo(const char *node, const char *service,
1990 const struct addrinfo *hints, struct addrinfo **res)
1991 {
1992 ensure_socket_initialization();
1993 return getaddrinfo(node, service, hints, res);
1994 }
1995
1996 int mingw_socket(int domain, int type, int protocol)
1997 {
1998 int sockfd;
1999 SOCKET s;
2000
2001 ensure_socket_initialization();
2002 s = WSASocket(domain, type, protocol, NULL, 0, 0);
2003 if (s == INVALID_SOCKET) {
2004 /*
2005 * WSAGetLastError() values are regular BSD error codes
2006 * biased by WSABASEERR.
2007 * However, strerror() does not know about networking
2008 * specific errors, which are values beginning at 38 or so.
2009 * Therefore, we choose to leave the biased error code
2010 * in errno so that _if_ someone looks up the code somewhere,
2011 * then it is at least the number that are usually listed.
2012 */
2013 errno = WSAGetLastError();
2014 return -1;
2015 }
2016 /* convert into a file descriptor */
2017 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
2018 closesocket(s);
2019 return error("unable to make a socket file descriptor: %s",
2020 strerror(errno));
2021 }
2022 return sockfd;
2023 }
2024
2025 #undef connect
2026 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
2027 {
2028 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2029 return connect(s, sa, sz);
2030 }
2031
2032 #undef bind
2033 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
2034 {
2035 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2036 return bind(s, sa, sz);
2037 }
2038
2039 #undef setsockopt
2040 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
2041 {
2042 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2043 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
2044 }
2045
2046 #undef shutdown
2047 int mingw_shutdown(int sockfd, int how)
2048 {
2049 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2050 return shutdown(s, how);
2051 }
2052
2053 #undef listen
2054 int mingw_listen(int sockfd, int backlog)
2055 {
2056 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2057 return listen(s, backlog);
2058 }
2059
2060 #undef accept
2061 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
2062 {
2063 int sockfd2;
2064
2065 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
2066 SOCKET s2 = accept(s1, sa, sz);
2067
2068 /* convert into a file descriptor */
2069 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
2070 int err = errno;
2071 closesocket(s2);
2072 return error("unable to make a socket file descriptor: %s",
2073 strerror(err));
2074 }
2075 return sockfd2;
2076 }
2077
2078 #undef rename
2079 int mingw_rename(const char *pold, const char *pnew)
2080 {
2081 DWORD attrs, gle;
2082 int tries = 0;
2083 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
2084 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
2085 return -1;
2086
2087 /*
2088 * Try native rename() first to get errno right.
2089 * It is based on MoveFile(), which cannot overwrite existing files.
2090 */
2091 if (!_wrename(wpold, wpnew))
2092 return 0;
2093 if (errno != EEXIST)
2094 return -1;
2095 repeat:
2096 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
2097 return 0;
2098 /* TODO: translate more errors */
2099 gle = GetLastError();
2100 if (gle == ERROR_ACCESS_DENIED &&
2101 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
2102 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
2103 DWORD attrsold = GetFileAttributesW(wpold);
2104 if (attrsold == INVALID_FILE_ATTRIBUTES ||
2105 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
2106 errno = EISDIR;
2107 else if (!_wrmdir(wpnew))
2108 goto repeat;
2109 return -1;
2110 }
2111 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
2112 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
2113 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
2114 return 0;
2115 gle = GetLastError();
2116 /* revert file attributes on failure */
2117 SetFileAttributesW(wpnew, attrs);
2118 }
2119 }
2120 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
2121 /*
2122 * We assume that some other process had the source or
2123 * destination file open at the wrong moment and retry.
2124 * In order to give the other process a higher chance to
2125 * complete its operation, we give up our time slice now.
2126 * If we have to retry again, we do sleep a bit.
2127 */
2128 Sleep(delay[tries]);
2129 tries++;
2130 goto repeat;
2131 }
2132 if (gle == ERROR_ACCESS_DENIED &&
2133 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
2134 "Should I try again?", pold, pnew))
2135 goto repeat;
2136
2137 errno = EACCES;
2138 return -1;
2139 }
2140
2141 /*
2142 * Note that this doesn't return the actual pagesize, but
2143 * the allocation granularity. If future Windows specific git code
2144 * needs the real getpagesize function, we need to find another solution.
2145 */
2146 int mingw_getpagesize(void)
2147 {
2148 SYSTEM_INFO si;
2149 GetSystemInfo(&si);
2150 return si.dwAllocationGranularity;
2151 }
2152
2153 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
2154 enum EXTENDED_NAME_FORMAT {
2155 NameDisplay = 3,
2156 NameUserPrincipal = 8
2157 };
2158
2159 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
2160 {
2161 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
2162 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
2163 static wchar_t wbuffer[1024];
2164 DWORD len;
2165
2166 if (!INIT_PROC_ADDR(GetUserNameExW))
2167 return NULL;
2168
2169 len = ARRAY_SIZE(wbuffer);
2170 if (GetUserNameExW(type, wbuffer, &len)) {
2171 char *converted = xmalloc((len *= 3));
2172 if (xwcstoutf(converted, wbuffer, len) >= 0)
2173 return converted;
2174 free(converted);
2175 }
2176
2177 return NULL;
2178 }
2179
2180 char *mingw_query_user_email(void)
2181 {
2182 return get_extended_user_info(NameUserPrincipal);
2183 }
2184
2185 struct passwd *getpwuid(int uid)
2186 {
2187 static unsigned initialized;
2188 static char user_name[100];
2189 static struct passwd *p;
2190 wchar_t buf[100];
2191 DWORD len;
2192
2193 if (initialized)
2194 return p;
2195
2196 len = ARRAY_SIZE(buf);
2197 if (!GetUserNameW(buf, &len)) {
2198 initialized = 1;
2199 return NULL;
2200 }
2201
2202 if (xwcstoutf(user_name, buf, sizeof(user_name)) < 0) {
2203 initialized = 1;
2204 return NULL;
2205 }
2206
2207 p = xmalloc(sizeof(*p));
2208 p->pw_name = user_name;
2209 p->pw_gecos = get_extended_user_info(NameDisplay);
2210 if (!p->pw_gecos)
2211 p->pw_gecos = "unknown";
2212 p->pw_dir = NULL;
2213
2214 initialized = 1;
2215 return p;
2216 }
2217
2218 static HANDLE timer_event;
2219 static HANDLE timer_thread;
2220 static int timer_interval;
2221 static int one_shot;
2222 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
2223
2224 /* The timer works like this:
2225 * The thread, ticktack(), is a trivial routine that most of the time
2226 * only waits to receive the signal to terminate. The main thread tells
2227 * the thread to terminate by setting the timer_event to the signalled
2228 * state.
2229 * But ticktack() interrupts the wait state after the timer's interval
2230 * length to call the signal handler.
2231 */
2232
2233 static unsigned __stdcall ticktack(void *dummy)
2234 {
2235 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
2236 mingw_raise(SIGALRM);
2237 if (one_shot)
2238 break;
2239 }
2240 return 0;
2241 }
2242
2243 static int start_timer_thread(void)
2244 {
2245 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
2246 if (timer_event) {
2247 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
2248 if (!timer_thread )
2249 return errno = ENOMEM,
2250 error("cannot start timer thread");
2251 } else
2252 return errno = ENOMEM,
2253 error("cannot allocate resources for timer");
2254 return 0;
2255 }
2256
2257 static void stop_timer_thread(void)
2258 {
2259 if (timer_event)
2260 SetEvent(timer_event); /* tell thread to terminate */
2261 if (timer_thread) {
2262 int rc = WaitForSingleObject(timer_thread, 10000);
2263 if (rc == WAIT_TIMEOUT)
2264 error("timer thread did not terminate timely");
2265 else if (rc != WAIT_OBJECT_0)
2266 error("waiting for timer thread failed: %lu",
2267 GetLastError());
2268 CloseHandle(timer_thread);
2269 }
2270 if (timer_event)
2271 CloseHandle(timer_event);
2272 timer_event = NULL;
2273 timer_thread = NULL;
2274 }
2275
2276 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
2277 {
2278 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
2279 }
2280
2281 int setitimer(int type, struct itimerval *in, struct itimerval *out)
2282 {
2283 static const struct timeval zero;
2284 static int atexit_done;
2285
2286 if (out != NULL)
2287 return errno = EINVAL,
2288 error("setitimer param 3 != NULL not implemented");
2289 if (!is_timeval_eq(&in->it_interval, &zero) &&
2290 !is_timeval_eq(&in->it_interval, &in->it_value))
2291 return errno = EINVAL,
2292 error("setitimer: it_interval must be zero or eq it_value");
2293
2294 if (timer_thread)
2295 stop_timer_thread();
2296
2297 if (is_timeval_eq(&in->it_value, &zero) &&
2298 is_timeval_eq(&in->it_interval, &zero))
2299 return 0;
2300
2301 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2302 one_shot = is_timeval_eq(&in->it_interval, &zero);
2303 if (!atexit_done) {
2304 atexit(stop_timer_thread);
2305 atexit_done = 1;
2306 }
2307 return start_timer_thread();
2308 }
2309
2310 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2311 {
2312 if (sig != SIGALRM)
2313 return errno = EINVAL,
2314 error("sigaction only implemented for SIGALRM");
2315 if (out != NULL)
2316 return errno = EINVAL,
2317 error("sigaction: param 3 != NULL not implemented");
2318
2319 timer_fn = in->sa_handler;
2320 return 0;
2321 }
2322
2323 #undef signal
2324 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2325 {
2326 sig_handler_t old;
2327
2328 switch (sig) {
2329 case SIGALRM:
2330 old = timer_fn;
2331 timer_fn = handler;
2332 break;
2333
2334 case SIGINT:
2335 old = sigint_fn;
2336 sigint_fn = handler;
2337 break;
2338
2339 default:
2340 return signal(sig, handler);
2341 }
2342
2343 return old;
2344 }
2345
2346 #undef raise
2347 int mingw_raise(int sig)
2348 {
2349 switch (sig) {
2350 case SIGALRM:
2351 if (timer_fn == SIG_DFL) {
2352 if (isatty(STDERR_FILENO))
2353 fputs("Alarm clock\n", stderr);
2354 exit(128 + SIGALRM);
2355 } else if (timer_fn != SIG_IGN)
2356 timer_fn(SIGALRM);
2357 return 0;
2358
2359 case SIGINT:
2360 if (sigint_fn == SIG_DFL)
2361 exit(128 + SIGINT);
2362 else if (sigint_fn != SIG_IGN)
2363 sigint_fn(SIGINT);
2364 return 0;
2365
2366 #if defined(_MSC_VER)
2367 case SIGILL:
2368 case SIGFPE:
2369 case SIGSEGV:
2370 case SIGTERM:
2371 case SIGBREAK:
2372 case SIGABRT:
2373 case SIGABRT_COMPAT:
2374 /*
2375 * The <signal.h> header in the MS C Runtime defines 8 signals
2376 * as being supported on the platform. Anything else causes an
2377 * "Invalid signal or error" (which in DEBUG builds causes the
2378 * Abort/Retry/Ignore dialog). We by-pass the CRT for things we
2379 * already know will fail.
2380 */
2381 return raise(sig);
2382 default:
2383 errno = EINVAL;
2384 return -1;
2385
2386 #else
2387
2388 default:
2389 return raise(sig);
2390
2391 #endif
2392
2393 }
2394 }
2395
2396 int link(const char *oldpath, const char *newpath)
2397 {
2398 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2399 if (xutftowcs_path(woldpath, oldpath) < 0 ||
2400 xutftowcs_path(wnewpath, newpath) < 0)
2401 return -1;
2402
2403 if (!CreateHardLinkW(wnewpath, woldpath, NULL)) {
2404 errno = err_win_to_posix(GetLastError());
2405 return -1;
2406 }
2407 return 0;
2408 }
2409
2410 pid_t waitpid(pid_t pid, int *status, int options)
2411 {
2412 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2413 FALSE, pid);
2414 if (!h) {
2415 errno = ECHILD;
2416 return -1;
2417 }
2418
2419 if (pid > 0 && options & WNOHANG) {
2420 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2421 CloseHandle(h);
2422 return 0;
2423 }
2424 options &= ~WNOHANG;
2425 }
2426
2427 if (options == 0) {
2428 struct pinfo_t **ppinfo;
2429 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2430 CloseHandle(h);
2431 return 0;
2432 }
2433
2434 if (status)
2435 GetExitCodeProcess(h, (LPDWORD)status);
2436
2437 EnterCriticalSection(&pinfo_cs);
2438
2439 ppinfo = &pinfo;
2440 while (*ppinfo) {
2441 struct pinfo_t *info = *ppinfo;
2442 if (info->pid == pid) {
2443 CloseHandle(info->proc);
2444 *ppinfo = info->next;
2445 free(info);
2446 break;
2447 }
2448 ppinfo = &info->next;
2449 }
2450
2451 LeaveCriticalSection(&pinfo_cs);
2452
2453 CloseHandle(h);
2454 return pid;
2455 }
2456 CloseHandle(h);
2457
2458 errno = EINVAL;
2459 return -1;
2460 }
2461
2462 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2463 {
2464 int upos = 0, wpos = 0;
2465 const unsigned char *utf = (const unsigned char*) utfs;
2466 if (!utf || !wcs || wcslen < 1) {
2467 errno = EINVAL;
2468 return -1;
2469 }
2470 /* reserve space for \0 */
2471 wcslen--;
2472 if (utflen < 0)
2473 utflen = INT_MAX;
2474
2475 while (upos < utflen) {
2476 int c = utf[upos++] & 0xff;
2477 if (utflen == INT_MAX && c == 0)
2478 break;
2479
2480 if (wpos >= wcslen) {
2481 wcs[wpos] = 0;
2482 errno = ERANGE;
2483 return -1;
2484 }
2485
2486 if (c < 0x80) {
2487 /* ASCII */
2488 wcs[wpos++] = c;
2489 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2490 (utf[upos] & 0xc0) == 0x80) {
2491 /* 2-byte utf-8 */
2492 c = ((c & 0x1f) << 6);
2493 c |= (utf[upos++] & 0x3f);
2494 wcs[wpos++] = c;
2495 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2496 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2497 (utf[upos] & 0xc0) == 0x80 &&
2498 (utf[upos + 1] & 0xc0) == 0x80) {
2499 /* 3-byte utf-8 */
2500 c = ((c & 0x0f) << 12);
2501 c |= ((utf[upos++] & 0x3f) << 6);
2502 c |= (utf[upos++] & 0x3f);
2503 wcs[wpos++] = c;
2504 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2505 wpos + 1 < wcslen &&
2506 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2507 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2508 (utf[upos] & 0xc0) == 0x80 &&
2509 (utf[upos + 1] & 0xc0) == 0x80 &&
2510 (utf[upos + 2] & 0xc0) == 0x80) {
2511 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2512 c = ((c & 0x07) << 18);
2513 c |= ((utf[upos++] & 0x3f) << 12);
2514 c |= ((utf[upos++] & 0x3f) << 6);
2515 c |= (utf[upos++] & 0x3f);
2516 c -= 0x10000;
2517 wcs[wpos++] = 0xd800 | (c >> 10);
2518 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2519 } else if (c >= 0xa0) {
2520 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2521 wcs[wpos++] = c;
2522 } else {
2523 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2524 static const char *hex = "0123456789abcdef";
2525 wcs[wpos++] = hex[c >> 4];
2526 if (wpos < wcslen)
2527 wcs[wpos++] = hex[c & 0x0f];
2528 }
2529 }
2530 wcs[wpos] = 0;
2531 return wpos;
2532 }
2533
2534 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2535 {
2536 if (!wcs || !utf || utflen < 1) {
2537 errno = EINVAL;
2538 return -1;
2539 }
2540 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2541 if (utflen)
2542 return utflen - 1;
2543 errno = ERANGE;
2544 return -1;
2545 }
2546
2547 static void setup_windows_environment(void)
2548 {
2549 char *tmp = getenv("TMPDIR");
2550
2551 /* on Windows it is TMP and TEMP */
2552 if (!tmp) {
2553 if (!(tmp = getenv("TMP")))
2554 tmp = getenv("TEMP");
2555 if (tmp) {
2556 setenv("TMPDIR", tmp, 1);
2557 tmp = getenv("TMPDIR");
2558 }
2559 }
2560
2561 if (tmp) {
2562 /*
2563 * Convert all dir separators to forward slashes,
2564 * to help shell commands called from the Git
2565 * executable (by not mistaking the dir separators
2566 * for escape characters).
2567 */
2568 convert_slashes(tmp);
2569 }
2570
2571 /* simulate TERM to enable auto-color (see color.c) */
2572 if (!getenv("TERM"))
2573 setenv("TERM", "cygwin", 1);
2574
2575 /* calculate HOME if not set */
2576 if (!getenv("HOME")) {
2577 /*
2578 * try $HOMEDRIVE$HOMEPATH - the home share may be a network
2579 * location, thus also check if the path exists (i.e. is not
2580 * disconnected)
2581 */
2582 if ((tmp = getenv("HOMEDRIVE"))) {
2583 struct strbuf buf = STRBUF_INIT;
2584 strbuf_addstr(&buf, tmp);
2585 if ((tmp = getenv("HOMEPATH"))) {
2586 strbuf_addstr(&buf, tmp);
2587 if (is_directory(buf.buf))
2588 setenv("HOME", buf.buf, 1);
2589 else
2590 tmp = NULL; /* use $USERPROFILE */
2591 }
2592 strbuf_release(&buf);
2593 }
2594 /* use $USERPROFILE if the home share is not available */
2595 if (!tmp && (tmp = getenv("USERPROFILE")))
2596 setenv("HOME", tmp, 1);
2597 }
2598 }
2599
2600 int is_valid_win32_path(const char *path, int allow_literal_nul)
2601 {
2602 const char *p = path;
2603 int preceding_space_or_period = 0, i = 0, periods = 0;
2604
2605 if (!protect_ntfs)
2606 return 1;
2607
2608 skip_dos_drive_prefix((char **)&path);
2609 goto segment_start;
2610
2611 for (;;) {
2612 char c = *(path++);
2613 switch (c) {
2614 case '\0':
2615 case '/': case '\\':
2616 /* cannot end in ` ` or `.`, except for `.` and `..` */
2617 if (preceding_space_or_period &&
2618 (i != periods || periods > 2))
2619 return 0;
2620 if (!c)
2621 return 1;
2622
2623 i = periods = preceding_space_or_period = 0;
2624
2625 segment_start:
2626 switch (*path) {
2627 case 'a': case 'A': /* AUX */
2628 if (((c = path[++i]) != 'u' && c != 'U') ||
2629 ((c = path[++i]) != 'x' && c != 'X')) {
2630 not_a_reserved_name:
2631 path += i;
2632 continue;
2633 }
2634 break;
2635 case 'c': case 'C':
2636 /* COM1 ... COM9, CON, CONIN$, CONOUT$ */
2637 if ((c = path[++i]) != 'o' && c != 'O')
2638 goto not_a_reserved_name;
2639 c = path[++i];
2640 if (c == 'm' || c == 'M') { /* COM1 ... COM9 */
2641 c = path[++i];
2642 if (c < '1' || c > '9')
2643 goto not_a_reserved_name;
2644 } else if (c == 'n' || c == 'N') { /* CON */
2645 c = path[i + 1];
2646 if ((c == 'i' || c == 'I') &&
2647 ((c = path[i + 2]) == 'n' ||
2648 c == 'N') &&
2649 path[i + 3] == '$')
2650 i += 3; /* CONIN$ */
2651 else if ((c == 'o' || c == 'O') &&
2652 ((c = path[i + 2]) == 'u' ||
2653 c == 'U') &&
2654 ((c = path[i + 3]) == 't' ||
2655 c == 'T') &&
2656 path[i + 4] == '$')
2657 i += 4; /* CONOUT$ */
2658 } else
2659 goto not_a_reserved_name;
2660 break;
2661 case 'l': case 'L': /* LPT<N> */
2662 if (((c = path[++i]) != 'p' && c != 'P') ||
2663 ((c = path[++i]) != 't' && c != 'T') ||
2664 !isdigit(path[++i]))
2665 goto not_a_reserved_name;
2666 break;
2667 case 'n': case 'N': /* NUL */
2668 if (((c = path[++i]) != 'u' && c != 'U') ||
2669 ((c = path[++i]) != 'l' && c != 'L') ||
2670 (allow_literal_nul &&
2671 !path[i + 1] && p == path))
2672 goto not_a_reserved_name;
2673 break;
2674 case 'p': case 'P': /* PRN */
2675 if (((c = path[++i]) != 'r' && c != 'R') ||
2676 ((c = path[++i]) != 'n' && c != 'N'))
2677 goto not_a_reserved_name;
2678 break;
2679 default:
2680 continue;
2681 }
2682
2683 /*
2684 * So far, this looks like a reserved name. Let's see
2685 * whether it actually is one: trailing spaces, a file
2686 * extension, or an NTFS Alternate Data Stream do not
2687 * matter, the name is still reserved if any of those
2688 * follow immediately after the actual name.
2689 */
2690 i++;
2691 if (path[i] == ' ') {
2692 preceding_space_or_period = 1;
2693 while (path[++i] == ' ')
2694 ; /* skip all spaces */
2695 }
2696
2697 c = path[i];
2698 if (c && c != '.' && c != ':' && c != '/' && c != '\\')
2699 goto not_a_reserved_name;
2700
2701 /* contains reserved name */
2702 return 0;
2703 case '.':
2704 periods++;
2705 /* fallthru */
2706 case ' ':
2707 preceding_space_or_period = 1;
2708 i++;
2709 continue;
2710 case ':': /* DOS drive prefix was already skipped */
2711 case '<': case '>': case '"': case '|': case '?': case '*':
2712 /* illegal character */
2713 return 0;
2714 default:
2715 if (c > '\0' && c < '\x20')
2716 /* illegal character */
2717 return 0;
2718 }
2719 preceding_space_or_period = 0;
2720 i++;
2721 }
2722 }
2723
2724 #if !defined(_MSC_VER)
2725 /*
2726 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2727 * mingw startup code, see init.c in mingw runtime).
2728 */
2729 int _CRT_glob = 0;
2730 #endif
2731
2732 static NORETURN void die_startup(void)
2733 {
2734 fputs("fatal: not enough memory for initialization", stderr);
2735 exit(128);
2736 }
2737
2738 static void *malloc_startup(size_t size)
2739 {
2740 void *result = malloc(size);
2741 if (!result)
2742 die_startup();
2743 return result;
2744 }
2745
2746 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2747 {
2748 len = xwcstoutf(buffer, wcs, len) + 1;
2749 return memcpy(malloc_startup(len), buffer, len);
2750 }
2751
2752 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2753 DWORD desired_access, DWORD flags)
2754 {
2755 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2756 wchar_t buf[MAX_PATH];
2757 DWORD max = ARRAY_SIZE(buf);
2758 HANDLE handle;
2759 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2760
2761 if (!ret || ret >= max)
2762 return;
2763
2764 /* make sure this does not leak into child processes */
2765 SetEnvironmentVariableW(key, NULL);
2766 if (!wcscmp(buf, L"off")) {
2767 close(fd);
2768 handle = GetStdHandle(std_id);
2769 if (handle != INVALID_HANDLE_VALUE)
2770 CloseHandle(handle);
2771 return;
2772 }
2773 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2774 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2775 if (handle == INVALID_HANDLE_VALUE) {
2776 close(fd);
2777 handle = GetStdHandle(std_id);
2778 if (handle != INVALID_HANDLE_VALUE)
2779 CloseHandle(handle);
2780 } else {
2781 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2782 SetStdHandle(std_id, handle);
2783 dup2(new_fd, fd);
2784 /* do *not* close the new_fd: that would close stdout */
2785 }
2786 return;
2787 }
2788 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2789 flags, NULL);
2790 if (handle != INVALID_HANDLE_VALUE) {
2791 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2792 SetStdHandle(std_id, handle);
2793 dup2(new_fd, fd);
2794 close(new_fd);
2795 }
2796 }
2797
2798 static void maybe_redirect_std_handles(void)
2799 {
2800 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2801 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2802 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2803 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2804 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2805 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2806 }
2807
2808 #ifdef _MSC_VER
2809 #ifdef _DEBUG
2810 #include <crtdbg.h>
2811 #endif
2812 #endif
2813
2814 /*
2815 * We implement wmain() and compile with -municode, which would
2816 * normally ignore main(), but we call the latter from the former
2817 * so that we can handle non-ASCII command-line parameters
2818 * appropriately.
2819 *
2820 * To be more compatible with the core git code, we convert
2821 * argv into UTF8 and pass them directly to main().
2822 */
2823 int wmain(int argc, const wchar_t **wargv)
2824 {
2825 int i, maxlen, exit_status;
2826 char *buffer, **save;
2827 const char **argv;
2828
2829 trace2_initialize_clock();
2830
2831 #ifdef _MSC_VER
2832 #ifdef _DEBUG
2833 _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
2834 #endif
2835
2836 #ifdef USE_MSVC_CRTDBG
2837 _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
2838 #endif
2839 #endif
2840
2841 maybe_redirect_std_handles();
2842
2843 /* determine size of argv and environ conversion buffer */
2844 maxlen = wcslen(wargv[0]);
2845 for (i = 1; i < argc; i++)
2846 maxlen = max(maxlen, wcslen(wargv[i]));
2847
2848 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2849 maxlen = 3 * maxlen + 1;
2850 buffer = malloc_startup(maxlen);
2851
2852 /*
2853 * Create a UTF-8 version of w_argv. Also create a "save" copy
2854 * to remember all the string pointers because parse_options()
2855 * will remove claimed items from the argv that we pass down.
2856 */
2857 ALLOC_ARRAY(argv, argc + 1);
2858 ALLOC_ARRAY(save, argc + 1);
2859 for (i = 0; i < argc; i++)
2860 argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2861 argv[i] = save[i] = NULL;
2862 free(buffer);
2863
2864 /* fix Windows specific environment settings */
2865 setup_windows_environment();
2866
2867 unset_environment_variables = xstrdup("PERL5LIB");
2868
2869 /* initialize critical section for waitpid pinfo_t list */
2870 InitializeCriticalSection(&pinfo_cs);
2871
2872 /* set up default file mode and file modes for stdin/out/err */
2873 _fmode = _O_BINARY;
2874 _setmode(_fileno(stdin), _O_BINARY);
2875 _setmode(_fileno(stdout), _O_BINARY);
2876 _setmode(_fileno(stderr), _O_BINARY);
2877
2878 /* initialize Unicode console */
2879 winansi_init();
2880
2881 /* invoke the real main() using our utf8 version of argv. */
2882 exit_status = main(argc, argv);
2883
2884 for (i = 0; i < argc; i++)
2885 free(save[i]);
2886 free(save);
2887 free(argv);
2888
2889 return exit_status;
2890 }
2891
2892 int uname(struct utsname *buf)
2893 {
2894 unsigned v = (unsigned)GetVersion();
2895 memset(buf, 0, sizeof(*buf));
2896 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2897 xsnprintf(buf->release, sizeof(buf->release),
2898 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2899 /* assuming NT variants only.. */
2900 xsnprintf(buf->version, sizeof(buf->version),
2901 "%u", (v >> 16) & 0x7fff);
2902 return 0;
2903 }
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