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Merge branch 'ag/rebase-p'
[git.git] / compat / mingw.c
blob6ded1c859f1b5ae1ffe035ac228c0f8a5298097a
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
9 #define HCAST(type, handle) ((type)(intptr_t)handle)
10
11 static const int delay[] = { 0, 1, 10, 20, 40 };
12
13 int err_win_to_posix(DWORD winerr)
14 {
15 int error = ENOSYS;
16 switch(winerr) {
17 case ERROR_ACCESS_DENIED: error = EACCES; break;
18 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
19 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
20 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
21 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
22 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
23 case ERROR_BAD_COMMAND: error = EIO; break;
24 case ERROR_BAD_DEVICE: error = ENODEV; break;
25 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
26 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
27 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
28 case ERROR_BAD_LENGTH: error = EINVAL; break;
29 case ERROR_BAD_PATHNAME: error = ENOENT; break;
30 case ERROR_BAD_PIPE: error = EPIPE; break;
31 case ERROR_BAD_UNIT: error = ENODEV; break;
32 case ERROR_BAD_USERNAME: error = EINVAL; break;
33 case ERROR_BROKEN_PIPE: error = EPIPE; break;
34 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
35 case ERROR_BUSY: error = EBUSY; break;
36 case ERROR_BUSY_DRIVE: error = EBUSY; break;
37 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
38 case ERROR_CANNOT_MAKE: error = EACCES; break;
39 case ERROR_CANTOPEN: error = EIO; break;
40 case ERROR_CANTREAD: error = EIO; break;
41 case ERROR_CANTWRITE: error = EIO; break;
42 case ERROR_CRC: error = EIO; break;
43 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
44 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
45 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
46 case ERROR_DIRECTORY: error = EINVAL; break;
47 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
48 case ERROR_DISK_CHANGE: error = EIO; break;
49 case ERROR_DISK_FULL: error = ENOSPC; break;
50 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
51 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
52 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
53 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
54 case ERROR_FILE_EXISTS: error = EEXIST; break;
55 case ERROR_FILE_INVALID: error = ENODEV; break;
56 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
57 case ERROR_GEN_FAILURE: error = EIO; break;
58 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
59 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
60 case ERROR_INVALID_ACCESS: error = EACCES; break;
61 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
62 case ERROR_INVALID_BLOCK: error = EFAULT; break;
63 case ERROR_INVALID_DATA: error = EINVAL; break;
64 case ERROR_INVALID_DRIVE: error = ENODEV; break;
65 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
66 case ERROR_INVALID_FLAGS: error = EINVAL; break;
67 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
68 case ERROR_INVALID_HANDLE: error = EBADF; break;
69 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
70 case ERROR_INVALID_NAME: error = EINVAL; break;
71 case ERROR_INVALID_OWNER: error = EINVAL; break;
72 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
73 case ERROR_INVALID_PASSWORD: error = EPERM; break;
74 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
75 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
76 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
77 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
78 case ERROR_IO_DEVICE: error = EIO; break;
79 case ERROR_IO_INCOMPLETE: error = EINTR; break;
80 case ERROR_LOCKED: error = EBUSY; break;
81 case ERROR_LOCK_VIOLATION: error = EACCES; break;
82 case ERROR_LOGON_FAILURE: error = EACCES; break;
83 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
84 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
85 case ERROR_MORE_DATA: error = EPIPE; break;
86 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
87 case ERROR_NOACCESS: error = EFAULT; break;
88 case ERROR_NONE_MAPPED: error = EINVAL; break;
89 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
90 case ERROR_NOT_READY: error = EAGAIN; break;
91 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
92 case ERROR_NO_DATA: error = EPIPE; break;
93 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
94 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
95 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
96 case ERROR_OPEN_FAILED: error = EIO; break;
97 case ERROR_OPEN_FILES: error = EBUSY; break;
98 case ERROR_OPERATION_ABORTED: error = EINTR; break;
99 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
100 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
101 case ERROR_PATH_BUSY: error = EBUSY; break;
102 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
103 case ERROR_PIPE_BUSY: error = EBUSY; break;
104 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
105 case ERROR_PIPE_LISTENING: error = EPIPE; break;
106 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
107 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
108 case ERROR_READ_FAULT: error = EIO; break;
109 case ERROR_SEEK: error = EIO; break;
110 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
111 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
112 case ERROR_SHARING_VIOLATION: error = EACCES; break;
113 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
114 case ERROR_SWAPERROR: error = ENOENT; break;
115 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
116 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
117 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
118 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
119 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
120 case ERROR_WRITE_FAULT: error = EIO; break;
121 case ERROR_WRITE_PROTECT: error = EROFS; break;
122 }
123 return error;
124 }
125
126 static inline int is_file_in_use_error(DWORD errcode)
127 {
128 switch (errcode) {
129 case ERROR_SHARING_VIOLATION:
130 case ERROR_ACCESS_DENIED:
131 return 1;
132 }
133
134 return 0;
135 }
136
137 static int read_yes_no_answer(void)
138 {
139 char answer[1024];
140
141 if (fgets(answer, sizeof(answer), stdin)) {
142 size_t answer_len = strlen(answer);
143 int got_full_line = 0, c;
144
145 /* remove the newline */
146 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
147 answer[answer_len-2] = '\0';
148 got_full_line = 1;
149 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
150 answer[answer_len-1] = '\0';
151 got_full_line = 1;
152 }
153 /* flush the buffer in case we did not get the full line */
154 if (!got_full_line)
155 while ((c = getchar()) != EOF && c != '\n')
156 ;
157 } else
158 /* we could not read, return the
159 * default answer which is no */
160 return 0;
161
162 if (tolower(answer[0]) == 'y' && !answer[1])
163 return 1;
164 if (!strncasecmp(answer, "yes", sizeof(answer)))
165 return 1;
166 if (tolower(answer[0]) == 'n' && !answer[1])
167 return 0;
168 if (!strncasecmp(answer, "no", sizeof(answer)))
169 return 0;
170
171 /* did not find an answer we understand */
172 return -1;
173 }
174
175 static int ask_yes_no_if_possible(const char *format, ...)
176 {
177 char question[4096];
178 const char *retry_hook[] = { NULL, NULL, NULL };
179 va_list args;
180
181 va_start(args, format);
182 vsnprintf(question, sizeof(question), format, args);
183 va_end(args);
184
185 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
186 retry_hook[1] = question;
187 return !run_command_v_opt(retry_hook, 0);
188 }
189
190 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
191 return 0;
192
193 while (1) {
194 int answer;
195 fprintf(stderr, "%s (y/n) ", question);
196
197 if ((answer = read_yes_no_answer()) >= 0)
198 return answer;
199
200 fprintf(stderr, "Sorry, I did not understand your answer. "
201 "Please type 'y' or 'n'\n");
202 }
203 }
204
205 int mingw_unlink(const char *pathname)
206 {
207 int ret, tries = 0;
208 wchar_t wpathname[MAX_PATH];
209 if (xutftowcs_path(wpathname, pathname) < 0)
210 return -1;
211
212 /* read-only files cannot be removed */
213 _wchmod(wpathname, 0666);
214 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
215 if (!is_file_in_use_error(GetLastError()))
216 break;
217 /*
218 * We assume that some other process had the source or
219 * destination file open at the wrong moment and retry.
220 * In order to give the other process a higher chance to
221 * complete its operation, we give up our time slice now.
222 * If we have to retry again, we do sleep a bit.
223 */
224 Sleep(delay[tries]);
225 tries++;
226 }
227 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
228 ask_yes_no_if_possible("Unlink of file '%s' failed. "
229 "Should I try again?", pathname))
230 ret = _wunlink(wpathname);
231 return ret;
232 }
233
234 static int is_dir_empty(const wchar_t *wpath)
235 {
236 WIN32_FIND_DATAW findbuf;
237 HANDLE handle;
238 wchar_t wbuf[MAX_PATH + 2];
239 wcscpy(wbuf, wpath);
240 wcscat(wbuf, L"\\*");
241 handle = FindFirstFileW(wbuf, &findbuf);
242 if (handle == INVALID_HANDLE_VALUE)
243 return GetLastError() == ERROR_NO_MORE_FILES;
244
245 while (!wcscmp(findbuf.cFileName, L".") ||
246 !wcscmp(findbuf.cFileName, L".."))
247 if (!FindNextFileW(handle, &findbuf)) {
248 DWORD err = GetLastError();
249 FindClose(handle);
250 return err == ERROR_NO_MORE_FILES;
251 }
252 FindClose(handle);
253 return 0;
254 }
255
256 int mingw_rmdir(const char *pathname)
257 {
258 int ret, tries = 0;
259 wchar_t wpathname[MAX_PATH];
260 if (xutftowcs_path(wpathname, pathname) < 0)
261 return -1;
262
263 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
264 if (!is_file_in_use_error(GetLastError()))
265 errno = err_win_to_posix(GetLastError());
266 if (errno != EACCES)
267 break;
268 if (!is_dir_empty(wpathname)) {
269 errno = ENOTEMPTY;
270 break;
271 }
272 /*
273 * We assume that some other process had the source or
274 * destination file open at the wrong moment and retry.
275 * In order to give the other process a higher chance to
276 * complete its operation, we give up our time slice now.
277 * If we have to retry again, we do sleep a bit.
278 */
279 Sleep(delay[tries]);
280 tries++;
281 }
282 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
283 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
284 "Should I try again?", pathname))
285 ret = _wrmdir(wpathname);
286 return ret;
287 }
288
289 static inline int needs_hiding(const char *path)
290 {
291 const char *basename;
292
293 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
294 return 0;
295
296 /* We cannot use basename(), as it would remove trailing slashes */
297 mingw_skip_dos_drive_prefix((char **)&path);
298 if (!*path)
299 return 0;
300
301 for (basename = path; *path; path++)
302 if (is_dir_sep(*path)) {
303 do {
304 path++;
305 } while (is_dir_sep(*path));
306 /* ignore trailing slashes */
307 if (*path)
308 basename = path;
309 }
310
311 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
312 return *basename == '.';
313
314 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
315 return !strncasecmp(".git", basename, 4) &&
316 (!basename[4] || is_dir_sep(basename[4]));
317 }
318
319 static int set_hidden_flag(const wchar_t *path, int set)
320 {
321 DWORD original = GetFileAttributesW(path), modified;
322 if (set)
323 modified = original | FILE_ATTRIBUTE_HIDDEN;
324 else
325 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
326 if (original == modified || SetFileAttributesW(path, modified))
327 return 0;
328 errno = err_win_to_posix(GetLastError());
329 return -1;
330 }
331
332 int mingw_mkdir(const char *path, int mode)
333 {
334 int ret;
335 wchar_t wpath[MAX_PATH];
336 if (xutftowcs_path(wpath, path) < 0)
337 return -1;
338 ret = _wmkdir(wpath);
339 if (!ret && needs_hiding(path))
340 return set_hidden_flag(wpath, 1);
341 return ret;
342 }
343
344 int mingw_open (const char *filename, int oflags, ...)
345 {
346 va_list args;
347 unsigned mode;
348 int fd;
349 wchar_t wfilename[MAX_PATH];
350
351 va_start(args, oflags);
352 mode = va_arg(args, int);
353 va_end(args);
354
355 if (filename && !strcmp(filename, "/dev/null"))
356 filename = "nul";
357
358 if (xutftowcs_path(wfilename, filename) < 0)
359 return -1;
360 fd = _wopen(wfilename, oflags, mode);
361
362 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
363 DWORD attrs = GetFileAttributesW(wfilename);
364 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
365 errno = EISDIR;
366 }
367 if ((oflags & O_CREAT) && needs_hiding(filename)) {
368 /*
369 * Internally, _wopen() uses the CreateFile() API which errors
370 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
371 * specified and an already existing file's attributes do not
372 * match *exactly*. As there is no mode or flag we can set that
373 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
374 * again *without* the O_CREAT flag (that corresponds to the
375 * CREATE_ALWAYS flag of CreateFile()).
376 */
377 if (fd < 0 && errno == EACCES)
378 fd = _wopen(wfilename, oflags & ~O_CREAT, mode);
379 if (fd >= 0 && set_hidden_flag(wfilename, 1))
380 warning("could not mark '%s' as hidden.", filename);
381 }
382 return fd;
383 }
384
385 static BOOL WINAPI ctrl_ignore(DWORD type)
386 {
387 return TRUE;
388 }
389
390 #undef fgetc
391 int mingw_fgetc(FILE *stream)
392 {
393 int ch;
394 if (!isatty(_fileno(stream)))
395 return fgetc(stream);
396
397 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
398 while (1) {
399 ch = fgetc(stream);
400 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
401 break;
402
403 /* Ctrl+C was pressed, simulate SIGINT and retry */
404 mingw_raise(SIGINT);
405 }
406 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
407 return ch;
408 }
409
410 #undef fopen
411 FILE *mingw_fopen (const char *filename, const char *otype)
412 {
413 int hide = needs_hiding(filename);
414 FILE *file;
415 wchar_t wfilename[MAX_PATH], wotype[4];
416 if (filename && !strcmp(filename, "/dev/null"))
417 filename = "nul";
418 if (xutftowcs_path(wfilename, filename) < 0 ||
419 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
420 return NULL;
421 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
422 error("could not unhide %s", filename);
423 return NULL;
424 }
425 file = _wfopen(wfilename, wotype);
426 if (!file && GetLastError() == ERROR_INVALID_NAME)
427 errno = ENOENT;
428 if (file && hide && set_hidden_flag(wfilename, 1))
429 warning("could not mark '%s' as hidden.", filename);
430 return file;
431 }
432
433 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
434 {
435 int hide = needs_hiding(filename);
436 FILE *file;
437 wchar_t wfilename[MAX_PATH], wotype[4];
438 if (filename && !strcmp(filename, "/dev/null"))
439 filename = "nul";
440 if (xutftowcs_path(wfilename, filename) < 0 ||
441 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
442 return NULL;
443 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
444 error("could not unhide %s", filename);
445 return NULL;
446 }
447 file = _wfreopen(wfilename, wotype, stream);
448 if (file && hide && set_hidden_flag(wfilename, 1))
449 warning("could not mark '%s' as hidden.", filename);
450 return file;
451 }
452
453 #undef fflush
454 int mingw_fflush(FILE *stream)
455 {
456 int ret = fflush(stream);
457
458 /*
459 * write() is used behind the scenes of stdio output functions.
460 * Since git code does not check for errors after each stdio write
461 * operation, it can happen that write() is called by a later
462 * stdio function even if an earlier write() call failed. In the
463 * case of a pipe whose readable end was closed, only the first
464 * call to write() reports EPIPE on Windows. Subsequent write()
465 * calls report EINVAL. It is impossible to notice whether this
466 * fflush invocation triggered such a case, therefore, we have to
467 * catch all EINVAL errors whole-sale.
468 */
469 if (ret && errno == EINVAL)
470 errno = EPIPE;
471
472 return ret;
473 }
474
475 #undef write
476 ssize_t mingw_write(int fd, const void *buf, size_t len)
477 {
478 ssize_t result = write(fd, buf, len);
479
480 if (result < 0 && errno == EINVAL && buf) {
481 /* check if fd is a pipe */
482 HANDLE h = (HANDLE) _get_osfhandle(fd);
483 if (GetFileType(h) == FILE_TYPE_PIPE)
484 errno = EPIPE;
485 else
486 errno = EINVAL;
487 }
488
489 return result;
490 }
491
492 int mingw_access(const char *filename, int mode)
493 {
494 wchar_t wfilename[MAX_PATH];
495 if (xutftowcs_path(wfilename, filename) < 0)
496 return -1;
497 /* X_OK is not supported by the MSVCRT version */
498 return _waccess(wfilename, mode & ~X_OK);
499 }
500
501 int mingw_chdir(const char *dirname)
502 {
503 wchar_t wdirname[MAX_PATH];
504 if (xutftowcs_path(wdirname, dirname) < 0)
505 return -1;
506 return _wchdir(wdirname);
507 }
508
509 int mingw_chmod(const char *filename, int mode)
510 {
511 wchar_t wfilename[MAX_PATH];
512 if (xutftowcs_path(wfilename, filename) < 0)
513 return -1;
514 return _wchmod(wfilename, mode);
515 }
516
517 /*
518 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
519 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
520 */
521 static inline long long filetime_to_hnsec(const FILETIME *ft)
522 {
523 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
524 /* Windows to Unix Epoch conversion */
525 return winTime - 116444736000000000LL;
526 }
527
528 static inline time_t filetime_to_time_t(const FILETIME *ft)
529 {
530 return (time_t)(filetime_to_hnsec(ft) / 10000000);
531 }
532
533 /**
534 * Verifies that safe_create_leading_directories() would succeed.
535 */
536 static int has_valid_directory_prefix(wchar_t *wfilename)
537 {
538 int n = wcslen(wfilename);
539
540 while (n > 0) {
541 wchar_t c = wfilename[--n];
542 DWORD attributes;
543
544 if (!is_dir_sep(c))
545 continue;
546
547 wfilename[n] = L'\0';
548 attributes = GetFileAttributesW(wfilename);
549 wfilename[n] = c;
550 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
551 attributes == FILE_ATTRIBUTE_DEVICE)
552 return 1;
553 if (attributes == INVALID_FILE_ATTRIBUTES)
554 switch (GetLastError()) {
555 case ERROR_PATH_NOT_FOUND:
556 continue;
557 case ERROR_FILE_NOT_FOUND:
558 /* This implies parent directory exists. */
559 return 1;
560 }
561 return 0;
562 }
563 return 1;
564 }
565
566 /* We keep the do_lstat code in a separate function to avoid recursion.
567 * When a path ends with a slash, the stat will fail with ENOENT. In
568 * this case, we strip the trailing slashes and stat again.
569 *
570 * If follow is true then act like stat() and report on the link
571 * target. Otherwise report on the link itself.
572 */
573 static int do_lstat(int follow, const char *file_name, struct stat *buf)
574 {
575 WIN32_FILE_ATTRIBUTE_DATA fdata;
576 wchar_t wfilename[MAX_PATH];
577 if (xutftowcs_path(wfilename, file_name) < 0)
578 return -1;
579
580 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
581 buf->st_ino = 0;
582 buf->st_gid = 0;
583 buf->st_uid = 0;
584 buf->st_nlink = 1;
585 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
586 buf->st_size = fdata.nFileSizeLow |
587 (((off_t)fdata.nFileSizeHigh)<<32);
588 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
589 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
590 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
591 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
592 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
593 WIN32_FIND_DATAW findbuf;
594 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
595 if (handle != INVALID_HANDLE_VALUE) {
596 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
597 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
598 if (follow) {
599 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
600 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
601 } else {
602 buf->st_mode = S_IFLNK;
603 }
604 buf->st_mode |= S_IREAD;
605 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
606 buf->st_mode |= S_IWRITE;
607 }
608 FindClose(handle);
609 }
610 }
611 return 0;
612 }
613 switch (GetLastError()) {
614 case ERROR_ACCESS_DENIED:
615 case ERROR_SHARING_VIOLATION:
616 case ERROR_LOCK_VIOLATION:
617 case ERROR_SHARING_BUFFER_EXCEEDED:
618 errno = EACCES;
619 break;
620 case ERROR_BUFFER_OVERFLOW:
621 errno = ENAMETOOLONG;
622 break;
623 case ERROR_NOT_ENOUGH_MEMORY:
624 errno = ENOMEM;
625 break;
626 case ERROR_PATH_NOT_FOUND:
627 if (!has_valid_directory_prefix(wfilename)) {
628 errno = ENOTDIR;
629 break;
630 }
631 /* fallthru */
632 default:
633 errno = ENOENT;
634 break;
635 }
636 return -1;
637 }
638
639 /* We provide our own lstat/fstat functions, since the provided
640 * lstat/fstat functions are so slow. These stat functions are
641 * tailored for Git's usage (read: fast), and are not meant to be
642 * complete. Note that Git stat()s are redirected to mingw_lstat()
643 * too, since Windows doesn't really handle symlinks that well.
644 */
645 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
646 {
647 int namelen;
648 char alt_name[PATH_MAX];
649
650 if (!do_lstat(follow, file_name, buf))
651 return 0;
652
653 /* if file_name ended in a '/', Windows returned ENOENT;
654 * try again without trailing slashes
655 */
656 if (errno != ENOENT)
657 return -1;
658
659 namelen = strlen(file_name);
660 if (namelen && file_name[namelen-1] != '/')
661 return -1;
662 while (namelen && file_name[namelen-1] == '/')
663 --namelen;
664 if (!namelen || namelen >= PATH_MAX)
665 return -1;
666
667 memcpy(alt_name, file_name, namelen);
668 alt_name[namelen] = 0;
669 return do_lstat(follow, alt_name, buf);
670 }
671
672 int mingw_lstat(const char *file_name, struct stat *buf)
673 {
674 return do_stat_internal(0, file_name, buf);
675 }
676 int mingw_stat(const char *file_name, struct stat *buf)
677 {
678 return do_stat_internal(1, file_name, buf);
679 }
680
681 int mingw_fstat(int fd, struct stat *buf)
682 {
683 HANDLE fh = (HANDLE)_get_osfhandle(fd);
684 BY_HANDLE_FILE_INFORMATION fdata;
685
686 if (fh == INVALID_HANDLE_VALUE) {
687 errno = EBADF;
688 return -1;
689 }
690 /* direct non-file handles to MS's fstat() */
691 if (GetFileType(fh) != FILE_TYPE_DISK)
692 return _fstati64(fd, buf);
693
694 if (GetFileInformationByHandle(fh, &fdata)) {
695 buf->st_ino = 0;
696 buf->st_gid = 0;
697 buf->st_uid = 0;
698 buf->st_nlink = 1;
699 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
700 buf->st_size = fdata.nFileSizeLow |
701 (((off_t)fdata.nFileSizeHigh)<<32);
702 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
703 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
704 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
705 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
706 return 0;
707 }
708 errno = EBADF;
709 return -1;
710 }
711
712 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
713 {
714 long long winTime = t * 10000000LL + 116444736000000000LL;
715 ft->dwLowDateTime = winTime;
716 ft->dwHighDateTime = winTime >> 32;
717 }
718
719 int mingw_utime (const char *file_name, const struct utimbuf *times)
720 {
721 FILETIME mft, aft;
722 int fh, rc;
723 DWORD attrs;
724 wchar_t wfilename[MAX_PATH];
725 if (xutftowcs_path(wfilename, file_name) < 0)
726 return -1;
727
728 /* must have write permission */
729 attrs = GetFileAttributesW(wfilename);
730 if (attrs != INVALID_FILE_ATTRIBUTES &&
731 (attrs & FILE_ATTRIBUTE_READONLY)) {
732 /* ignore errors here; open() will report them */
733 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
734 }
735
736 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
737 rc = -1;
738 goto revert_attrs;
739 }
740
741 if (times) {
742 time_t_to_filetime(times->modtime, &mft);
743 time_t_to_filetime(times->actime, &aft);
744 } else {
745 GetSystemTimeAsFileTime(&mft);
746 aft = mft;
747 }
748 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
749 errno = EINVAL;
750 rc = -1;
751 } else
752 rc = 0;
753 close(fh);
754
755 revert_attrs:
756 if (attrs != INVALID_FILE_ATTRIBUTES &&
757 (attrs & FILE_ATTRIBUTE_READONLY)) {
758 /* ignore errors again */
759 SetFileAttributesW(wfilename, attrs);
760 }
761 return rc;
762 }
763
764 #undef strftime
765 size_t mingw_strftime(char *s, size_t max,
766 const char *format, const struct tm *tm)
767 {
768 size_t ret = strftime(s, max, format, tm);
769
770 if (!ret && errno == EINVAL)
771 die("invalid strftime format: '%s'", format);
772 return ret;
773 }
774
775 unsigned int sleep (unsigned int seconds)
776 {
777 Sleep(seconds*1000);
778 return 0;
779 }
780
781 char *mingw_mktemp(char *template)
782 {
783 wchar_t wtemplate[MAX_PATH];
784 if (xutftowcs_path(wtemplate, template) < 0)
785 return NULL;
786 if (!_wmktemp(wtemplate))
787 return NULL;
788 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
789 return NULL;
790 return template;
791 }
792
793 int mkstemp(char *template)
794 {
795 char *filename = mktemp(template);
796 if (filename == NULL)
797 return -1;
798 return open(filename, O_RDWR | O_CREAT, 0600);
799 }
800
801 int gettimeofday(struct timeval *tv, void *tz)
802 {
803 FILETIME ft;
804 long long hnsec;
805
806 GetSystemTimeAsFileTime(&ft);
807 hnsec = filetime_to_hnsec(&ft);
808 tv->tv_sec = hnsec / 10000000;
809 tv->tv_usec = (hnsec % 10000000) / 10;
810 return 0;
811 }
812
813 int pipe(int filedes[2])
814 {
815 HANDLE h[2];
816
817 /* this creates non-inheritable handles */
818 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
819 errno = err_win_to_posix(GetLastError());
820 return -1;
821 }
822 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
823 if (filedes[0] < 0) {
824 CloseHandle(h[0]);
825 CloseHandle(h[1]);
826 return -1;
827 }
828 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
829 if (filedes[1] < 0) {
830 close(filedes[0]);
831 CloseHandle(h[1]);
832 return -1;
833 }
834 return 0;
835 }
836
837 struct tm *gmtime_r(const time_t *timep, struct tm *result)
838 {
839 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
840 memcpy(result, gmtime(timep), sizeof(struct tm));
841 return result;
842 }
843
844 struct tm *localtime_r(const time_t *timep, struct tm *result)
845 {
846 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
847 memcpy(result, localtime(timep), sizeof(struct tm));
848 return result;
849 }
850
851 char *mingw_getcwd(char *pointer, int len)
852 {
853 wchar_t wpointer[MAX_PATH];
854 if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
855 return NULL;
856 if (xwcstoutf(pointer, wpointer, len) < 0)
857 return NULL;
858 convert_slashes(pointer);
859 return pointer;
860 }
861
862 /*
863 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
864 * (Parsing C++ Command-Line Arguments)
865 */
866 static const char *quote_arg(const char *arg)
867 {
868 /* count chars to quote */
869 int len = 0, n = 0;
870 int force_quotes = 0;
871 char *q, *d;
872 const char *p = arg;
873 if (!*p) force_quotes = 1;
874 while (*p) {
875 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
876 force_quotes = 1;
877 else if (*p == '"')
878 n++;
879 else if (*p == '\\') {
880 int count = 0;
881 while (*p == '\\') {
882 count++;
883 p++;
884 len++;
885 }
886 if (*p == '"')
887 n += count*2 + 1;
888 continue;
889 }
890 len++;
891 p++;
892 }
893 if (!force_quotes && n == 0)
894 return arg;
895
896 /* insert \ where necessary */
897 d = q = xmalloc(st_add3(len, n, 3));
898 *d++ = '"';
899 while (*arg) {
900 if (*arg == '"')
901 *d++ = '\\';
902 else if (*arg == '\\') {
903 int count = 0;
904 while (*arg == '\\') {
905 count++;
906 *d++ = *arg++;
907 }
908 if (*arg == '"') {
909 while (count-- > 0)
910 *d++ = '\\';
911 *d++ = '\\';
912 }
913 }
914 *d++ = *arg++;
915 }
916 *d++ = '"';
917 *d++ = 0;
918 return q;
919 }
920
921 static const char *parse_interpreter(const char *cmd)
922 {
923 static char buf[100];
924 char *p, *opt;
925 int n, fd;
926
927 /* don't even try a .exe */
928 n = strlen(cmd);
929 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
930 return NULL;
931
932 fd = open(cmd, O_RDONLY);
933 if (fd < 0)
934 return NULL;
935 n = read(fd, buf, sizeof(buf)-1);
936 close(fd);
937 if (n < 4) /* at least '#!/x' and not error */
938 return NULL;
939
940 if (buf[0] != '#' || buf[1] != '!')
941 return NULL;
942 buf[n] = '\0';
943 p = buf + strcspn(buf, "\r\n");
944 if (!*p)
945 return NULL;
946
947 *p = '\0';
948 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
949 return NULL;
950 /* strip options */
951 if ((opt = strchr(p+1, ' ')))
952 *opt = '\0';
953 return p+1;
954 }
955
956 /*
957 * exe_only means that we only want to detect .exe files, but not scripts
958 * (which do not have an extension)
959 */
960 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
961 int isexe, int exe_only)
962 {
963 char path[MAX_PATH];
964 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
965
966 if (!isexe && access(path, F_OK) == 0)
967 return xstrdup(path);
968 path[strlen(path)-4] = '\0';
969 if ((!exe_only || isexe) && access(path, F_OK) == 0)
970 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
971 return xstrdup(path);
972 return NULL;
973 }
974
975 /*
976 * Determines the absolute path of cmd using the split path in path.
977 * If cmd contains a slash or backslash, no lookup is performed.
978 */
979 static char *path_lookup(const char *cmd, int exe_only)
980 {
981 const char *path;
982 char *prog = NULL;
983 int len = strlen(cmd);
984 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
985
986 if (strchr(cmd, '/') || strchr(cmd, '\\'))
987 return xstrdup(cmd);
988
989 path = mingw_getenv("PATH");
990 if (!path)
991 return NULL;
992
993 while (!prog) {
994 const char *sep = strchrnul(path, ';');
995 int dirlen = sep - path;
996 if (dirlen)
997 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
998 if (!*sep)
999 break;
1000 path = sep + 1;
1001 }
1002
1003 return prog;
1004 }
1005
1006 static int do_putenv(char **env, const char *name, int size, int free_old);
1007
1008 /* used number of elements of environ array, including terminating NULL */
1009 static int environ_size = 0;
1010 /* allocated size of environ array, in bytes */
1011 static int environ_alloc = 0;
1012
1013 /*
1014 * Create environment block suitable for CreateProcess. Merges current
1015 * process environment and the supplied environment changes.
1016 */
1017 static wchar_t *make_environment_block(char **deltaenv)
1018 {
1019 wchar_t *wenvblk = NULL;
1020 char **tmpenv;
1021 int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1022
1023 while (deltaenv && deltaenv[i])
1024 i++;
1025
1026 /* copy the environment, leaving space for changes */
1027 ALLOC_ARRAY(tmpenv, size + i);
1028 memcpy(tmpenv, environ, size * sizeof(char*));
1029
1030 /* merge supplied environment changes into the temporary environment */
1031 for (i = 0; deltaenv && deltaenv[i]; i++)
1032 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1033
1034 /* create environment block from temporary environment */
1035 for (i = 0; tmpenv[i]; i++) {
1036 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1037 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1038 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1039 }
1040 /* add final \0 terminator */
1041 wenvblk[wenvpos] = 0;
1042 free(tmpenv);
1043 return wenvblk;
1044 }
1045
1046 struct pinfo_t {
1047 struct pinfo_t *next;
1048 pid_t pid;
1049 HANDLE proc;
1050 };
1051 static struct pinfo_t *pinfo = NULL;
1052 CRITICAL_SECTION pinfo_cs;
1053
1054 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1055 const char *dir,
1056 int prepend_cmd, int fhin, int fhout, int fherr)
1057 {
1058 STARTUPINFOW si;
1059 PROCESS_INFORMATION pi;
1060 struct strbuf args;
1061 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1062 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1063 BOOL ret;
1064
1065 /* Determine whether or not we are associated to a console */
1066 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1067 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1068 FILE_ATTRIBUTE_NORMAL, NULL);
1069 if (cons == INVALID_HANDLE_VALUE) {
1070 /* There is no console associated with this process.
1071 * Since the child is a console process, Windows
1072 * would normally create a console window. But
1073 * since we'll be redirecting std streams, we do
1074 * not need the console.
1075 * It is necessary to use DETACHED_PROCESS
1076 * instead of CREATE_NO_WINDOW to make ssh
1077 * recognize that it has no console.
1078 */
1079 flags |= DETACHED_PROCESS;
1080 } else {
1081 /* There is already a console. If we specified
1082 * DETACHED_PROCESS here, too, Windows would
1083 * disassociate the child from the console.
1084 * The same is true for CREATE_NO_WINDOW.
1085 * Go figure!
1086 */
1087 CloseHandle(cons);
1088 }
1089 memset(&si, 0, sizeof(si));
1090 si.cb = sizeof(si);
1091 si.dwFlags = STARTF_USESTDHANDLES;
1092 si.hStdInput = winansi_get_osfhandle(fhin);
1093 si.hStdOutput = winansi_get_osfhandle(fhout);
1094 si.hStdError = winansi_get_osfhandle(fherr);
1095
1096 if (xutftowcs_path(wcmd, cmd) < 0)
1097 return -1;
1098 if (dir && xutftowcs_path(wdir, dir) < 0)
1099 return -1;
1100
1101 /* concatenate argv, quoting args as we go */
1102 strbuf_init(&args, 0);
1103 if (prepend_cmd) {
1104 char *quoted = (char *)quote_arg(cmd);
1105 strbuf_addstr(&args, quoted);
1106 if (quoted != cmd)
1107 free(quoted);
1108 }
1109 for (; *argv; argv++) {
1110 char *quoted = (char *)quote_arg(*argv);
1111 if (*args.buf)
1112 strbuf_addch(&args, ' ');
1113 strbuf_addstr(&args, quoted);
1114 if (quoted != *argv)
1115 free(quoted);
1116 }
1117
1118 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1119 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1120 strbuf_release(&args);
1121
1122 wenvblk = make_environment_block(deltaenv);
1123
1124 memset(&pi, 0, sizeof(pi));
1125 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1126 wenvblk, dir ? wdir : NULL, &si, &pi);
1127
1128 free(wenvblk);
1129 free(wargs);
1130
1131 if (!ret) {
1132 errno = ENOENT;
1133 return -1;
1134 }
1135 CloseHandle(pi.hThread);
1136
1137 /*
1138 * The process ID is the human-readable identifier of the process
1139 * that we want to present in log and error messages. The handle
1140 * is not useful for this purpose. But we cannot close it, either,
1141 * because it is not possible to turn a process ID into a process
1142 * handle after the process terminated.
1143 * Keep the handle in a list for waitpid.
1144 */
1145 EnterCriticalSection(&pinfo_cs);
1146 {
1147 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1148 info->pid = pi.dwProcessId;
1149 info->proc = pi.hProcess;
1150 info->next = pinfo;
1151 pinfo = info;
1152 }
1153 LeaveCriticalSection(&pinfo_cs);
1154
1155 return (pid_t)pi.dwProcessId;
1156 }
1157
1158 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1159 {
1160 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1161 }
1162
1163 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1164 const char *dir,
1165 int fhin, int fhout, int fherr)
1166 {
1167 pid_t pid;
1168 char *prog = path_lookup(cmd, 0);
1169
1170 if (!prog) {
1171 errno = ENOENT;
1172 pid = -1;
1173 }
1174 else {
1175 const char *interpr = parse_interpreter(prog);
1176
1177 if (interpr) {
1178 const char *argv0 = argv[0];
1179 char *iprog = path_lookup(interpr, 1);
1180 argv[0] = prog;
1181 if (!iprog) {
1182 errno = ENOENT;
1183 pid = -1;
1184 }
1185 else {
1186 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1187 fhin, fhout, fherr);
1188 free(iprog);
1189 }
1190 argv[0] = argv0;
1191 }
1192 else
1193 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1194 fhin, fhout, fherr);
1195 free(prog);
1196 }
1197 return pid;
1198 }
1199
1200 static int try_shell_exec(const char *cmd, char *const *argv)
1201 {
1202 const char *interpr = parse_interpreter(cmd);
1203 char *prog;
1204 int pid = 0;
1205
1206 if (!interpr)
1207 return 0;
1208 prog = path_lookup(interpr, 1);
1209 if (prog) {
1210 int argc = 0;
1211 const char **argv2;
1212 while (argv[argc]) argc++;
1213 ALLOC_ARRAY(argv2, argc + 1);
1214 argv2[0] = (char *)cmd; /* full path to the script file */
1215 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1216 pid = mingw_spawnv(prog, argv2, 1);
1217 if (pid >= 0) {
1218 int status;
1219 if (waitpid(pid, &status, 0) < 0)
1220 status = 255;
1221 exit(status);
1222 }
1223 pid = 1; /* indicate that we tried but failed */
1224 free(prog);
1225 free(argv2);
1226 }
1227 return pid;
1228 }
1229
1230 int mingw_execv(const char *cmd, char *const *argv)
1231 {
1232 /* check if git_command is a shell script */
1233 if (!try_shell_exec(cmd, argv)) {
1234 int pid, status;
1235
1236 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1237 if (pid < 0)
1238 return -1;
1239 if (waitpid(pid, &status, 0) < 0)
1240 status = 255;
1241 exit(status);
1242 }
1243 return -1;
1244 }
1245
1246 int mingw_execvp(const char *cmd, char *const *argv)
1247 {
1248 char *prog = path_lookup(cmd, 0);
1249
1250 if (prog) {
1251 mingw_execv(prog, argv);
1252 free(prog);
1253 } else
1254 errno = ENOENT;
1255
1256 return -1;
1257 }
1258
1259 int mingw_kill(pid_t pid, int sig)
1260 {
1261 if (pid > 0 && sig == SIGTERM) {
1262 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1263
1264 if (TerminateProcess(h, -1)) {
1265 CloseHandle(h);
1266 return 0;
1267 }
1268
1269 errno = err_win_to_posix(GetLastError());
1270 CloseHandle(h);
1271 return -1;
1272 } else if (pid > 0 && sig == 0) {
1273 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1274 if (h) {
1275 CloseHandle(h);
1276 return 0;
1277 }
1278 }
1279
1280 errno = EINVAL;
1281 return -1;
1282 }
1283
1284 /*
1285 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1286 */
1287 static int compareenv(const void *v1, const void *v2)
1288 {
1289 const char *e1 = *(const char**)v1;
1290 const char *e2 = *(const char**)v2;
1291
1292 for (;;) {
1293 int c1 = *e1++;
1294 int c2 = *e2++;
1295 c1 = (c1 == '=') ? 0 : tolower(c1);
1296 c2 = (c2 == '=') ? 0 : tolower(c2);
1297 if (c1 > c2)
1298 return 1;
1299 if (c1 < c2)
1300 return -1;
1301 if (c1 == 0)
1302 return 0;
1303 }
1304 }
1305
1306 static int bsearchenv(char **env, const char *name, size_t size)
1307 {
1308 unsigned low = 0, high = size;
1309 while (low < high) {
1310 unsigned mid = low + ((high - low) >> 1);
1311 int cmp = compareenv(&env[mid], &name);
1312 if (cmp < 0)
1313 low = mid + 1;
1314 else if (cmp > 0)
1315 high = mid;
1316 else
1317 return mid;
1318 }
1319 return ~low; /* not found, return 1's complement of insert position */
1320 }
1321
1322 /*
1323 * If name contains '=', then sets the variable, otherwise it unsets it
1324 * Size includes the terminating NULL. Env must have room for size + 1 entries
1325 * (in case of insert). Returns the new size. Optionally frees removed entries.
1326 */
1327 static int do_putenv(char **env, const char *name, int size, int free_old)
1328 {
1329 int i = bsearchenv(env, name, size - 1);
1330
1331 /* optionally free removed / replaced entry */
1332 if (i >= 0 && free_old)
1333 free(env[i]);
1334
1335 if (strchr(name, '=')) {
1336 /* if new value ('key=value') is specified, insert or replace entry */
1337 if (i < 0) {
1338 i = ~i;
1339 memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1340 size++;
1341 }
1342 env[i] = (char*) name;
1343 } else if (i >= 0) {
1344 /* otherwise ('key') remove existing entry */
1345 size--;
1346 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1347 }
1348 return size;
1349 }
1350
1351 char *mingw_getenv(const char *name)
1352 {
1353 char *value;
1354 int pos = bsearchenv(environ, name, environ_size - 1);
1355 if (pos < 0)
1356 return NULL;
1357 value = strchr(environ[pos], '=');
1358 return value ? &value[1] : NULL;
1359 }
1360
1361 int mingw_putenv(const char *namevalue)
1362 {
1363 ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1364 environ_size = do_putenv(environ, namevalue, environ_size, 1);
1365 return 0;
1366 }
1367
1368 /*
1369 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1370 * that service contains a numerical port, or that it is null. It
1371 * does a simple search using gethostbyname, and returns one IPv4 host
1372 * if one was found.
1373 */
1374 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1375 const struct addrinfo *hints,
1376 struct addrinfo **res)
1377 {
1378 struct hostent *h = NULL;
1379 struct addrinfo *ai;
1380 struct sockaddr_in *sin;
1381
1382 if (node) {
1383 h = gethostbyname(node);
1384 if (!h)
1385 return WSAGetLastError();
1386 }
1387
1388 ai = xmalloc(sizeof(struct addrinfo));
1389 *res = ai;
1390 ai->ai_flags = 0;
1391 ai->ai_family = AF_INET;
1392 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1393 switch (ai->ai_socktype) {
1394 case SOCK_STREAM:
1395 ai->ai_protocol = IPPROTO_TCP;
1396 break;
1397 case SOCK_DGRAM:
1398 ai->ai_protocol = IPPROTO_UDP;
1399 break;
1400 default:
1401 ai->ai_protocol = 0;
1402 break;
1403 }
1404 ai->ai_addrlen = sizeof(struct sockaddr_in);
1405 if (hints && (hints->ai_flags & AI_CANONNAME))
1406 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1407 else
1408 ai->ai_canonname = NULL;
1409
1410 sin = xcalloc(1, ai->ai_addrlen);
1411 sin->sin_family = AF_INET;
1412 /* Note: getaddrinfo is supposed to allow service to be a string,
1413 * which should be looked up using getservbyname. This is
1414 * currently not implemented */
1415 if (service)
1416 sin->sin_port = htons(atoi(service));
1417 if (h)
1418 sin->sin_addr = *(struct in_addr *)h->h_addr;
1419 else if (hints && (hints->ai_flags & AI_PASSIVE))
1420 sin->sin_addr.s_addr = INADDR_ANY;
1421 else
1422 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1423 ai->ai_addr = (struct sockaddr *)sin;
1424 ai->ai_next = NULL;
1425 return 0;
1426 }
1427
1428 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1429 {
1430 free(res->ai_canonname);
1431 free(res->ai_addr);
1432 free(res);
1433 }
1434
1435 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1436 char *host, DWORD hostlen,
1437 char *serv, DWORD servlen, int flags)
1438 {
1439 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1440 if (sa->sa_family != AF_INET)
1441 return EAI_FAMILY;
1442 if (!host && !serv)
1443 return EAI_NONAME;
1444
1445 if (host && hostlen > 0) {
1446 struct hostent *ent = NULL;
1447 if (!(flags & NI_NUMERICHOST))
1448 ent = gethostbyaddr((const char *)&sin->sin_addr,
1449 sizeof(sin->sin_addr), AF_INET);
1450
1451 if (ent)
1452 snprintf(host, hostlen, "%s", ent->h_name);
1453 else if (flags & NI_NAMEREQD)
1454 return EAI_NONAME;
1455 else
1456 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1457 }
1458
1459 if (serv && servlen > 0) {
1460 struct servent *ent = NULL;
1461 if (!(flags & NI_NUMERICSERV))
1462 ent = getservbyport(sin->sin_port,
1463 flags & NI_DGRAM ? "udp" : "tcp");
1464
1465 if (ent)
1466 snprintf(serv, servlen, "%s", ent->s_name);
1467 else
1468 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1469 }
1470
1471 return 0;
1472 }
1473
1474 static HMODULE ipv6_dll = NULL;
1475 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1476 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1477 const struct addrinfo *hints,
1478 struct addrinfo **res);
1479 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1480 char *host, DWORD hostlen,
1481 char *serv, DWORD servlen, int flags);
1482 /*
1483 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1484 * don't need to try to load that one dynamically.
1485 */
1486
1487 static void socket_cleanup(void)
1488 {
1489 WSACleanup();
1490 if (ipv6_dll)
1491 FreeLibrary(ipv6_dll);
1492 ipv6_dll = NULL;
1493 ipv6_freeaddrinfo = freeaddrinfo_stub;
1494 ipv6_getaddrinfo = getaddrinfo_stub;
1495 ipv6_getnameinfo = getnameinfo_stub;
1496 }
1497
1498 static void ensure_socket_initialization(void)
1499 {
1500 WSADATA wsa;
1501 static int initialized = 0;
1502 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1503 const char **name;
1504
1505 if (initialized)
1506 return;
1507
1508 if (WSAStartup(MAKEWORD(2,2), &wsa))
1509 die("unable to initialize winsock subsystem, error %d",
1510 WSAGetLastError());
1511
1512 for (name = libraries; *name; name++) {
1513 ipv6_dll = LoadLibrary(*name);
1514 if (!ipv6_dll)
1515 continue;
1516
1517 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1518 GetProcAddress(ipv6_dll, "freeaddrinfo");
1519 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1520 const struct addrinfo *,
1521 struct addrinfo **))
1522 GetProcAddress(ipv6_dll, "getaddrinfo");
1523 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1524 socklen_t, char *, DWORD,
1525 char *, DWORD, int))
1526 GetProcAddress(ipv6_dll, "getnameinfo");
1527 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1528 FreeLibrary(ipv6_dll);
1529 ipv6_dll = NULL;
1530 } else
1531 break;
1532 }
1533 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1534 ipv6_freeaddrinfo = freeaddrinfo_stub;
1535 ipv6_getaddrinfo = getaddrinfo_stub;
1536 ipv6_getnameinfo = getnameinfo_stub;
1537 }
1538
1539 atexit(socket_cleanup);
1540 initialized = 1;
1541 }
1542
1543 #undef gethostname
1544 int mingw_gethostname(char *name, int namelen)
1545 {
1546 ensure_socket_initialization();
1547 return gethostname(name, namelen);
1548 }
1549
1550 #undef gethostbyname
1551 struct hostent *mingw_gethostbyname(const char *host)
1552 {
1553 ensure_socket_initialization();
1554 return gethostbyname(host);
1555 }
1556
1557 void mingw_freeaddrinfo(struct addrinfo *res)
1558 {
1559 ipv6_freeaddrinfo(res);
1560 }
1561
1562 int mingw_getaddrinfo(const char *node, const char *service,
1563 const struct addrinfo *hints, struct addrinfo **res)
1564 {
1565 ensure_socket_initialization();
1566 return ipv6_getaddrinfo(node, service, hints, res);
1567 }
1568
1569 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1570 char *host, DWORD hostlen, char *serv, DWORD servlen,
1571 int flags)
1572 {
1573 ensure_socket_initialization();
1574 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1575 }
1576
1577 int mingw_socket(int domain, int type, int protocol)
1578 {
1579 int sockfd;
1580 SOCKET s;
1581
1582 ensure_socket_initialization();
1583 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1584 if (s == INVALID_SOCKET) {
1585 /*
1586 * WSAGetLastError() values are regular BSD error codes
1587 * biased by WSABASEERR.
1588 * However, strerror() does not know about networking
1589 * specific errors, which are values beginning at 38 or so.
1590 * Therefore, we choose to leave the biased error code
1591 * in errno so that _if_ someone looks up the code somewhere,
1592 * then it is at least the number that are usually listed.
1593 */
1594 errno = WSAGetLastError();
1595 return -1;
1596 }
1597 /* convert into a file descriptor */
1598 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1599 closesocket(s);
1600 return error("unable to make a socket file descriptor: %s",
1601 strerror(errno));
1602 }
1603 return sockfd;
1604 }
1605
1606 #undef connect
1607 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1608 {
1609 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1610 return connect(s, sa, sz);
1611 }
1612
1613 #undef bind
1614 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1615 {
1616 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1617 return bind(s, sa, sz);
1618 }
1619
1620 #undef setsockopt
1621 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1622 {
1623 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1624 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1625 }
1626
1627 #undef shutdown
1628 int mingw_shutdown(int sockfd, int how)
1629 {
1630 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1631 return shutdown(s, how);
1632 }
1633
1634 #undef listen
1635 int mingw_listen(int sockfd, int backlog)
1636 {
1637 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1638 return listen(s, backlog);
1639 }
1640
1641 #undef accept
1642 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1643 {
1644 int sockfd2;
1645
1646 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1647 SOCKET s2 = accept(s1, sa, sz);
1648
1649 /* convert into a file descriptor */
1650 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1651 int err = errno;
1652 closesocket(s2);
1653 return error("unable to make a socket file descriptor: %s",
1654 strerror(err));
1655 }
1656 return sockfd2;
1657 }
1658
1659 #undef rename
1660 int mingw_rename(const char *pold, const char *pnew)
1661 {
1662 DWORD attrs, gle;
1663 int tries = 0;
1664 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1665 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1666 return -1;
1667
1668 /*
1669 * Try native rename() first to get errno right.
1670 * It is based on MoveFile(), which cannot overwrite existing files.
1671 */
1672 if (!_wrename(wpold, wpnew))
1673 return 0;
1674 if (errno != EEXIST)
1675 return -1;
1676 repeat:
1677 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1678 return 0;
1679 /* TODO: translate more errors */
1680 gle = GetLastError();
1681 if (gle == ERROR_ACCESS_DENIED &&
1682 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1683 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1684 DWORD attrsold = GetFileAttributesW(wpold);
1685 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1686 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1687 errno = EISDIR;
1688 else if (!_wrmdir(wpnew))
1689 goto repeat;
1690 return -1;
1691 }
1692 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1693 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1694 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1695 return 0;
1696 gle = GetLastError();
1697 /* revert file attributes on failure */
1698 SetFileAttributesW(wpnew, attrs);
1699 }
1700 }
1701 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1702 /*
1703 * We assume that some other process had the source or
1704 * destination file open at the wrong moment and retry.
1705 * In order to give the other process a higher chance to
1706 * complete its operation, we give up our time slice now.
1707 * If we have to retry again, we do sleep a bit.
1708 */
1709 Sleep(delay[tries]);
1710 tries++;
1711 goto repeat;
1712 }
1713 if (gle == ERROR_ACCESS_DENIED &&
1714 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1715 "Should I try again?", pold, pnew))
1716 goto repeat;
1717
1718 errno = EACCES;
1719 return -1;
1720 }
1721
1722 /*
1723 * Note that this doesn't return the actual pagesize, but
1724 * the allocation granularity. If future Windows specific git code
1725 * needs the real getpagesize function, we need to find another solution.
1726 */
1727 int mingw_getpagesize(void)
1728 {
1729 SYSTEM_INFO si;
1730 GetSystemInfo(&si);
1731 return si.dwAllocationGranularity;
1732 }
1733
1734 struct passwd *getpwuid(int uid)
1735 {
1736 static char user_name[100];
1737 static struct passwd p;
1738
1739 DWORD len = sizeof(user_name);
1740 if (!GetUserName(user_name, &len))
1741 return NULL;
1742 p.pw_name = user_name;
1743 p.pw_gecos = "unknown";
1744 p.pw_dir = NULL;
1745 return &p;
1746 }
1747
1748 static HANDLE timer_event;
1749 static HANDLE timer_thread;
1750 static int timer_interval;
1751 static int one_shot;
1752 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1753
1754 /* The timer works like this:
1755 * The thread, ticktack(), is a trivial routine that most of the time
1756 * only waits to receive the signal to terminate. The main thread tells
1757 * the thread to terminate by setting the timer_event to the signalled
1758 * state.
1759 * But ticktack() interrupts the wait state after the timer's interval
1760 * length to call the signal handler.
1761 */
1762
1763 static unsigned __stdcall ticktack(void *dummy)
1764 {
1765 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1766 mingw_raise(SIGALRM);
1767 if (one_shot)
1768 break;
1769 }
1770 return 0;
1771 }
1772
1773 static int start_timer_thread(void)
1774 {
1775 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1776 if (timer_event) {
1777 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1778 if (!timer_thread )
1779 return errno = ENOMEM,
1780 error("cannot start timer thread");
1781 } else
1782 return errno = ENOMEM,
1783 error("cannot allocate resources for timer");
1784 return 0;
1785 }
1786
1787 static void stop_timer_thread(void)
1788 {
1789 if (timer_event)
1790 SetEvent(timer_event); /* tell thread to terminate */
1791 if (timer_thread) {
1792 int rc = WaitForSingleObject(timer_thread, 1000);
1793 if (rc == WAIT_TIMEOUT)
1794 error("timer thread did not terminate timely");
1795 else if (rc != WAIT_OBJECT_0)
1796 error("waiting for timer thread failed: %lu",
1797 GetLastError());
1798 CloseHandle(timer_thread);
1799 }
1800 if (timer_event)
1801 CloseHandle(timer_event);
1802 timer_event = NULL;
1803 timer_thread = NULL;
1804 }
1805
1806 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1807 {
1808 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1809 }
1810
1811 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1812 {
1813 static const struct timeval zero;
1814 static int atexit_done;
1815
1816 if (out != NULL)
1817 return errno = EINVAL,
1818 error("setitimer param 3 != NULL not implemented");
1819 if (!is_timeval_eq(&in->it_interval, &zero) &&
1820 !is_timeval_eq(&in->it_interval, &in->it_value))
1821 return errno = EINVAL,
1822 error("setitimer: it_interval must be zero or eq it_value");
1823
1824 if (timer_thread)
1825 stop_timer_thread();
1826
1827 if (is_timeval_eq(&in->it_value, &zero) &&
1828 is_timeval_eq(&in->it_interval, &zero))
1829 return 0;
1830
1831 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1832 one_shot = is_timeval_eq(&in->it_interval, &zero);
1833 if (!atexit_done) {
1834 atexit(stop_timer_thread);
1835 atexit_done = 1;
1836 }
1837 return start_timer_thread();
1838 }
1839
1840 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1841 {
1842 if (sig != SIGALRM)
1843 return errno = EINVAL,
1844 error("sigaction only implemented for SIGALRM");
1845 if (out != NULL)
1846 return errno = EINVAL,
1847 error("sigaction: param 3 != NULL not implemented");
1848
1849 timer_fn = in->sa_handler;
1850 return 0;
1851 }
1852
1853 #undef signal
1854 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1855 {
1856 sig_handler_t old;
1857
1858 switch (sig) {
1859 case SIGALRM:
1860 old = timer_fn;
1861 timer_fn = handler;
1862 break;
1863
1864 case SIGINT:
1865 old = sigint_fn;
1866 sigint_fn = handler;
1867 break;
1868
1869 default:
1870 return signal(sig, handler);
1871 }
1872
1873 return old;
1874 }
1875
1876 #undef raise
1877 int mingw_raise(int sig)
1878 {
1879 switch (sig) {
1880 case SIGALRM:
1881 if (timer_fn == SIG_DFL) {
1882 if (isatty(STDERR_FILENO))
1883 fputs("Alarm clock\n", stderr);
1884 exit(128 + SIGALRM);
1885 } else if (timer_fn != SIG_IGN)
1886 timer_fn(SIGALRM);
1887 return 0;
1888
1889 case SIGINT:
1890 if (sigint_fn == SIG_DFL)
1891 exit(128 + SIGINT);
1892 else if (sigint_fn != SIG_IGN)
1893 sigint_fn(SIGINT);
1894 return 0;
1895
1896 default:
1897 return raise(sig);
1898 }
1899 }
1900
1901 int link(const char *oldpath, const char *newpath)
1902 {
1903 typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1904 static T create_hard_link = NULL;
1905 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1906 if (xutftowcs_path(woldpath, oldpath) < 0 ||
1907 xutftowcs_path(wnewpath, newpath) < 0)
1908 return -1;
1909
1910 if (!create_hard_link) {
1911 create_hard_link = (T) GetProcAddress(
1912 GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1913 if (!create_hard_link)
1914 create_hard_link = (T)-1;
1915 }
1916 if (create_hard_link == (T)-1) {
1917 errno = ENOSYS;
1918 return -1;
1919 }
1920 if (!create_hard_link(wnewpath, woldpath, NULL)) {
1921 errno = err_win_to_posix(GetLastError());
1922 return -1;
1923 }
1924 return 0;
1925 }
1926
1927 pid_t waitpid(pid_t pid, int *status, int options)
1928 {
1929 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1930 FALSE, pid);
1931 if (!h) {
1932 errno = ECHILD;
1933 return -1;
1934 }
1935
1936 if (pid > 0 && options & WNOHANG) {
1937 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1938 CloseHandle(h);
1939 return 0;
1940 }
1941 options &= ~WNOHANG;
1942 }
1943
1944 if (options == 0) {
1945 struct pinfo_t **ppinfo;
1946 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1947 CloseHandle(h);
1948 return 0;
1949 }
1950
1951 if (status)
1952 GetExitCodeProcess(h, (LPDWORD)status);
1953
1954 EnterCriticalSection(&pinfo_cs);
1955
1956 ppinfo = &pinfo;
1957 while (*ppinfo) {
1958 struct pinfo_t *info = *ppinfo;
1959 if (info->pid == pid) {
1960 CloseHandle(info->proc);
1961 *ppinfo = info->next;
1962 free(info);
1963 break;
1964 }
1965 ppinfo = &info->next;
1966 }
1967
1968 LeaveCriticalSection(&pinfo_cs);
1969
1970 CloseHandle(h);
1971 return pid;
1972 }
1973 CloseHandle(h);
1974
1975 errno = EINVAL;
1976 return -1;
1977 }
1978
1979 int mingw_skip_dos_drive_prefix(char **path)
1980 {
1981 int ret = has_dos_drive_prefix(*path);
1982 *path += ret;
1983 return ret;
1984 }
1985
1986 int mingw_offset_1st_component(const char *path)
1987 {
1988 char *pos = (char *)path;
1989
1990 /* unc paths */
1991 if (!skip_dos_drive_prefix(&pos) &&
1992 is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
1993 /* skip server name */
1994 pos = strpbrk(pos + 2, "\\/");
1995 if (!pos)
1996 return 0; /* Error: malformed unc path */
1997
1998 do {
1999 pos++;
2000 } while (*pos && !is_dir_sep(*pos));
2001 }
2002
2003 return pos + is_dir_sep(*pos) - path;
2004 }
2005
2006 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2007 {
2008 int upos = 0, wpos = 0;
2009 const unsigned char *utf = (const unsigned char*) utfs;
2010 if (!utf || !wcs || wcslen < 1) {
2011 errno = EINVAL;
2012 return -1;
2013 }
2014 /* reserve space for \0 */
2015 wcslen--;
2016 if (utflen < 0)
2017 utflen = INT_MAX;
2018
2019 while (upos < utflen) {
2020 int c = utf[upos++] & 0xff;
2021 if (utflen == INT_MAX && c == 0)
2022 break;
2023
2024 if (wpos >= wcslen) {
2025 wcs[wpos] = 0;
2026 errno = ERANGE;
2027 return -1;
2028 }
2029
2030 if (c < 0x80) {
2031 /* ASCII */
2032 wcs[wpos++] = c;
2033 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2034 (utf[upos] & 0xc0) == 0x80) {
2035 /* 2-byte utf-8 */
2036 c = ((c & 0x1f) << 6);
2037 c |= (utf[upos++] & 0x3f);
2038 wcs[wpos++] = c;
2039 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2040 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2041 (utf[upos] & 0xc0) == 0x80 &&
2042 (utf[upos + 1] & 0xc0) == 0x80) {
2043 /* 3-byte utf-8 */
2044 c = ((c & 0x0f) << 12);
2045 c |= ((utf[upos++] & 0x3f) << 6);
2046 c |= (utf[upos++] & 0x3f);
2047 wcs[wpos++] = c;
2048 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2049 wpos + 1 < wcslen &&
2050 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2051 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2052 (utf[upos] & 0xc0) == 0x80 &&
2053 (utf[upos + 1] & 0xc0) == 0x80 &&
2054 (utf[upos + 2] & 0xc0) == 0x80) {
2055 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2056 c = ((c & 0x07) << 18);
2057 c |= ((utf[upos++] & 0x3f) << 12);
2058 c |= ((utf[upos++] & 0x3f) << 6);
2059 c |= (utf[upos++] & 0x3f);
2060 c -= 0x10000;
2061 wcs[wpos++] = 0xd800 | (c >> 10);
2062 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2063 } else if (c >= 0xa0) {
2064 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2065 wcs[wpos++] = c;
2066 } else {
2067 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2068 static const char *hex = "0123456789abcdef";
2069 wcs[wpos++] = hex[c >> 4];
2070 if (wpos < wcslen)
2071 wcs[wpos++] = hex[c & 0x0f];
2072 }
2073 }
2074 wcs[wpos] = 0;
2075 return wpos;
2076 }
2077
2078 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2079 {
2080 if (!wcs || !utf || utflen < 1) {
2081 errno = EINVAL;
2082 return -1;
2083 }
2084 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2085 if (utflen)
2086 return utflen - 1;
2087 errno = ERANGE;
2088 return -1;
2089 }
2090
2091 static void setup_windows_environment(void)
2092 {
2093 char *tmp = getenv("TMPDIR");
2094
2095 /* on Windows it is TMP and TEMP */
2096 if (!tmp) {
2097 if (!(tmp = getenv("TMP")))
2098 tmp = getenv("TEMP");
2099 if (tmp) {
2100 setenv("TMPDIR", tmp, 1);
2101 tmp = getenv("TMPDIR");
2102 }
2103 }
2104
2105 if (tmp) {
2106 /*
2107 * Convert all dir separators to forward slashes,
2108 * to help shell commands called from the Git
2109 * executable (by not mistaking the dir separators
2110 * for escape characters).
2111 */
2112 convert_slashes(tmp);
2113 }
2114
2115 /* simulate TERM to enable auto-color (see color.c) */
2116 if (!getenv("TERM"))
2117 setenv("TERM", "cygwin", 1);
2118 }
2119
2120 /*
2121 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2122 * mingw startup code, see init.c in mingw runtime).
2123 */
2124 int _CRT_glob = 0;
2125
2126 typedef struct {
2127 int newmode;
2128 } _startupinfo;
2129
2130 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2131 _startupinfo *si);
2132
2133 static NORETURN void die_startup(void)
2134 {
2135 fputs("fatal: not enough memory for initialization", stderr);
2136 exit(128);
2137 }
2138
2139 static void *malloc_startup(size_t size)
2140 {
2141 void *result = malloc(size);
2142 if (!result)
2143 die_startup();
2144 return result;
2145 }
2146
2147 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2148 {
2149 len = xwcstoutf(buffer, wcs, len) + 1;
2150 return memcpy(malloc_startup(len), buffer, len);
2151 }
2152
2153 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2154 DWORD desired_access, DWORD flags)
2155 {
2156 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2157 wchar_t buf[MAX_PATH];
2158 DWORD max = ARRAY_SIZE(buf);
2159 HANDLE handle;
2160 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2161
2162 if (!ret || ret >= max)
2163 return;
2164
2165 /* make sure this does not leak into child processes */
2166 SetEnvironmentVariableW(key, NULL);
2167 if (!wcscmp(buf, L"off")) {
2168 close(fd);
2169 handle = GetStdHandle(std_id);
2170 if (handle != INVALID_HANDLE_VALUE)
2171 CloseHandle(handle);
2172 return;
2173 }
2174 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2175 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2176 if (handle == INVALID_HANDLE_VALUE) {
2177 close(fd);
2178 handle = GetStdHandle(std_id);
2179 if (handle != INVALID_HANDLE_VALUE)
2180 CloseHandle(handle);
2181 } else {
2182 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2183 SetStdHandle(std_id, handle);
2184 dup2(new_fd, fd);
2185 /* do *not* close the new_fd: that would close stdout */
2186 }
2187 return;
2188 }
2189 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2190 flags, NULL);
2191 if (handle != INVALID_HANDLE_VALUE) {
2192 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2193 SetStdHandle(std_id, handle);
2194 dup2(new_fd, fd);
2195 close(new_fd);
2196 }
2197 }
2198
2199 static void maybe_redirect_std_handles(void)
2200 {
2201 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2202 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2203 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2204 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2205 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2206 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2207 }
2208
2209 void mingw_startup(void)
2210 {
2211 int i, maxlen, argc;
2212 char *buffer;
2213 wchar_t **wenv, **wargv;
2214 _startupinfo si;
2215
2216 maybe_redirect_std_handles();
2217
2218 /* get wide char arguments and environment */
2219 si.newmode = 0;
2220 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2221 die_startup();
2222
2223 /* determine size of argv and environ conversion buffer */
2224 maxlen = wcslen(wargv[0]);
2225 for (i = 1; i < argc; i++)
2226 maxlen = max(maxlen, wcslen(wargv[i]));
2227 for (i = 0; wenv[i]; i++)
2228 maxlen = max(maxlen, wcslen(wenv[i]));
2229
2230 /*
2231 * nedmalloc can't free CRT memory, allocate resizable environment
2232 * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2233 * use it while initializing the environment itself.
2234 */
2235 environ_size = i + 1;
2236 environ_alloc = alloc_nr(environ_size * sizeof(char*));
2237 environ = malloc_startup(environ_alloc);
2238
2239 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2240 maxlen = 3 * maxlen + 1;
2241 buffer = malloc_startup(maxlen);
2242
2243 /* convert command line arguments and environment to UTF-8 */
2244 for (i = 0; i < argc; i++)
2245 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2246 for (i = 0; wenv[i]; i++)
2247 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2248 environ[i] = NULL;
2249 free(buffer);
2250
2251 /* sort environment for O(log n) getenv / putenv */
2252 qsort(environ, i, sizeof(char*), compareenv);
2253
2254 /* fix Windows specific environment settings */
2255 setup_windows_environment();
2256
2257 /* initialize critical section for waitpid pinfo_t list */
2258 InitializeCriticalSection(&pinfo_cs);
2259
2260 /* set up default file mode and file modes for stdin/out/err */
2261 _fmode = _O_BINARY;
2262 _setmode(_fileno(stdin), _O_BINARY);
2263 _setmode(_fileno(stdout), _O_BINARY);
2264 _setmode(_fileno(stderr), _O_BINARY);
2265
2266 /* initialize Unicode console */
2267 winansi_init();
2268 }
2269
2270 int uname(struct utsname *buf)
2271 {
2272 unsigned v = (unsigned)GetVersion();
2273 memset(buf, 0, sizeof(*buf));
2274 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2275 xsnprintf(buf->release, sizeof(buf->release),
2276 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2277 /* assuming NT variants only.. */
2278 xsnprintf(buf->version, sizeof(buf->version),
2279 "%u", (v >> 16) & 0x7fff);
2280 return 0;
2281 }
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