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streaming: convert open_istream to use struct object_id
[git.git] / compat / mingw.c
blob2d44d21aca8d31f67b16cb9a90245b4db526ff76
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 unsigned int sleep (unsigned int seconds)
765 {
766 Sleep(seconds*1000);
767 return 0;
768 }
769
770 char *mingw_mktemp(char *template)
771 {
772 wchar_t wtemplate[MAX_PATH];
773 if (xutftowcs_path(wtemplate, template) < 0)
774 return NULL;
775 if (!_wmktemp(wtemplate))
776 return NULL;
777 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
778 return NULL;
779 return template;
780 }
781
782 int mkstemp(char *template)
783 {
784 char *filename = mktemp(template);
785 if (filename == NULL)
786 return -1;
787 return open(filename, O_RDWR | O_CREAT, 0600);
788 }
789
790 int gettimeofday(struct timeval *tv, void *tz)
791 {
792 FILETIME ft;
793 long long hnsec;
794
795 GetSystemTimeAsFileTime(&ft);
796 hnsec = filetime_to_hnsec(&ft);
797 tv->tv_sec = hnsec / 10000000;
798 tv->tv_usec = (hnsec % 10000000) / 10;
799 return 0;
800 }
801
802 int pipe(int filedes[2])
803 {
804 HANDLE h[2];
805
806 /* this creates non-inheritable handles */
807 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
808 errno = err_win_to_posix(GetLastError());
809 return -1;
810 }
811 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
812 if (filedes[0] < 0) {
813 CloseHandle(h[0]);
814 CloseHandle(h[1]);
815 return -1;
816 }
817 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
818 if (filedes[1] < 0) {
819 close(filedes[0]);
820 CloseHandle(h[1]);
821 return -1;
822 }
823 return 0;
824 }
825
826 struct tm *gmtime_r(const time_t *timep, struct tm *result)
827 {
828 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
829 memcpy(result, gmtime(timep), sizeof(struct tm));
830 return result;
831 }
832
833 struct tm *localtime_r(const time_t *timep, struct tm *result)
834 {
835 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
836 memcpy(result, localtime(timep), sizeof(struct tm));
837 return result;
838 }
839
840 char *mingw_getcwd(char *pointer, int len)
841 {
842 wchar_t wpointer[MAX_PATH];
843 if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
844 return NULL;
845 if (xwcstoutf(pointer, wpointer, len) < 0)
846 return NULL;
847 convert_slashes(pointer);
848 return pointer;
849 }
850
851 /*
852 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
853 * (Parsing C++ Command-Line Arguments)
854 */
855 static const char *quote_arg(const char *arg)
856 {
857 /* count chars to quote */
858 int len = 0, n = 0;
859 int force_quotes = 0;
860 char *q, *d;
861 const char *p = arg;
862 if (!*p) force_quotes = 1;
863 while (*p) {
864 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
865 force_quotes = 1;
866 else if (*p == '"')
867 n++;
868 else if (*p == '\\') {
869 int count = 0;
870 while (*p == '\\') {
871 count++;
872 p++;
873 len++;
874 }
875 if (*p == '"')
876 n += count*2 + 1;
877 continue;
878 }
879 len++;
880 p++;
881 }
882 if (!force_quotes && n == 0)
883 return arg;
884
885 /* insert \ where necessary */
886 d = q = xmalloc(st_add3(len, n, 3));
887 *d++ = '"';
888 while (*arg) {
889 if (*arg == '"')
890 *d++ = '\\';
891 else if (*arg == '\\') {
892 int count = 0;
893 while (*arg == '\\') {
894 count++;
895 *d++ = *arg++;
896 }
897 if (*arg == '"') {
898 while (count-- > 0)
899 *d++ = '\\';
900 *d++ = '\\';
901 }
902 }
903 *d++ = *arg++;
904 }
905 *d++ = '"';
906 *d++ = 0;
907 return q;
908 }
909
910 static const char *parse_interpreter(const char *cmd)
911 {
912 static char buf[100];
913 char *p, *opt;
914 int n, fd;
915
916 /* don't even try a .exe */
917 n = strlen(cmd);
918 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
919 return NULL;
920
921 fd = open(cmd, O_RDONLY);
922 if (fd < 0)
923 return NULL;
924 n = read(fd, buf, sizeof(buf)-1);
925 close(fd);
926 if (n < 4) /* at least '#!/x' and not error */
927 return NULL;
928
929 if (buf[0] != '#' || buf[1] != '!')
930 return NULL;
931 buf[n] = '\0';
932 p = buf + strcspn(buf, "\r\n");
933 if (!*p)
934 return NULL;
935
936 *p = '\0';
937 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
938 return NULL;
939 /* strip options */
940 if ((opt = strchr(p+1, ' ')))
941 *opt = '\0';
942 return p+1;
943 }
944
945 /*
946 * exe_only means that we only want to detect .exe files, but not scripts
947 * (which do not have an extension)
948 */
949 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
950 int isexe, int exe_only)
951 {
952 char path[MAX_PATH];
953 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
954
955 if (!isexe && access(path, F_OK) == 0)
956 return xstrdup(path);
957 path[strlen(path)-4] = '\0';
958 if ((!exe_only || isexe) && access(path, F_OK) == 0)
959 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
960 return xstrdup(path);
961 return NULL;
962 }
963
964 /*
965 * Determines the absolute path of cmd using the split path in path.
966 * If cmd contains a slash or backslash, no lookup is performed.
967 */
968 static char *path_lookup(const char *cmd, int exe_only)
969 {
970 const char *path;
971 char *prog = NULL;
972 int len = strlen(cmd);
973 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
974
975 if (strchr(cmd, '/') || strchr(cmd, '\\'))
976 return xstrdup(cmd);
977
978 path = mingw_getenv("PATH");
979 if (!path)
980 return NULL;
981
982 while (!prog) {
983 const char *sep = strchrnul(path, ';');
984 int dirlen = sep - path;
985 if (dirlen)
986 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
987 if (!*sep)
988 break;
989 path = sep + 1;
990 }
991
992 return prog;
993 }
994
995 static int do_putenv(char **env, const char *name, int size, int free_old);
996
997 /* used number of elements of environ array, including terminating NULL */
998 static int environ_size = 0;
999 /* allocated size of environ array, in bytes */
1000 static int environ_alloc = 0;
1001
1002 /*
1003 * Create environment block suitable for CreateProcess. Merges current
1004 * process environment and the supplied environment changes.
1005 */
1006 static wchar_t *make_environment_block(char **deltaenv)
1007 {
1008 wchar_t *wenvblk = NULL;
1009 char **tmpenv;
1010 int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1011
1012 while (deltaenv && deltaenv[i])
1013 i++;
1014
1015 /* copy the environment, leaving space for changes */
1016 ALLOC_ARRAY(tmpenv, size + i);
1017 memcpy(tmpenv, environ, size * sizeof(char*));
1018
1019 /* merge supplied environment changes into the temporary environment */
1020 for (i = 0; deltaenv && deltaenv[i]; i++)
1021 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1022
1023 /* create environment block from temporary environment */
1024 for (i = 0; tmpenv[i]; i++) {
1025 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1026 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1027 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1028 }
1029 /* add final \0 terminator */
1030 wenvblk[wenvpos] = 0;
1031 free(tmpenv);
1032 return wenvblk;
1033 }
1034
1035 struct pinfo_t {
1036 struct pinfo_t *next;
1037 pid_t pid;
1038 HANDLE proc;
1039 };
1040 static struct pinfo_t *pinfo = NULL;
1041 CRITICAL_SECTION pinfo_cs;
1042
1043 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1044 const char *dir,
1045 int prepend_cmd, int fhin, int fhout, int fherr)
1046 {
1047 STARTUPINFOW si;
1048 PROCESS_INFORMATION pi;
1049 struct strbuf args;
1050 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1051 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1052 BOOL ret;
1053
1054 /* Determine whether or not we are associated to a console */
1055 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1056 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1057 FILE_ATTRIBUTE_NORMAL, NULL);
1058 if (cons == INVALID_HANDLE_VALUE) {
1059 /* There is no console associated with this process.
1060 * Since the child is a console process, Windows
1061 * would normally create a console window. But
1062 * since we'll be redirecting std streams, we do
1063 * not need the console.
1064 * It is necessary to use DETACHED_PROCESS
1065 * instead of CREATE_NO_WINDOW to make ssh
1066 * recognize that it has no console.
1067 */
1068 flags |= DETACHED_PROCESS;
1069 } else {
1070 /* There is already a console. If we specified
1071 * DETACHED_PROCESS here, too, Windows would
1072 * disassociate the child from the console.
1073 * The same is true for CREATE_NO_WINDOW.
1074 * Go figure!
1075 */
1076 CloseHandle(cons);
1077 }
1078 memset(&si, 0, sizeof(si));
1079 si.cb = sizeof(si);
1080 si.dwFlags = STARTF_USESTDHANDLES;
1081 si.hStdInput = winansi_get_osfhandle(fhin);
1082 si.hStdOutput = winansi_get_osfhandle(fhout);
1083 si.hStdError = winansi_get_osfhandle(fherr);
1084
1085 if (xutftowcs_path(wcmd, cmd) < 0)
1086 return -1;
1087 if (dir && xutftowcs_path(wdir, dir) < 0)
1088 return -1;
1089
1090 /* concatenate argv, quoting args as we go */
1091 strbuf_init(&args, 0);
1092 if (prepend_cmd) {
1093 char *quoted = (char *)quote_arg(cmd);
1094 strbuf_addstr(&args, quoted);
1095 if (quoted != cmd)
1096 free(quoted);
1097 }
1098 for (; *argv; argv++) {
1099 char *quoted = (char *)quote_arg(*argv);
1100 if (*args.buf)
1101 strbuf_addch(&args, ' ');
1102 strbuf_addstr(&args, quoted);
1103 if (quoted != *argv)
1104 free(quoted);
1105 }
1106
1107 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1108 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1109 strbuf_release(&args);
1110
1111 wenvblk = make_environment_block(deltaenv);
1112
1113 memset(&pi, 0, sizeof(pi));
1114 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1115 wenvblk, dir ? wdir : NULL, &si, &pi);
1116
1117 free(wenvblk);
1118 free(wargs);
1119
1120 if (!ret) {
1121 errno = ENOENT;
1122 return -1;
1123 }
1124 CloseHandle(pi.hThread);
1125
1126 /*
1127 * The process ID is the human-readable identifier of the process
1128 * that we want to present in log and error messages. The handle
1129 * is not useful for this purpose. But we cannot close it, either,
1130 * because it is not possible to turn a process ID into a process
1131 * handle after the process terminated.
1132 * Keep the handle in a list for waitpid.
1133 */
1134 EnterCriticalSection(&pinfo_cs);
1135 {
1136 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1137 info->pid = pi.dwProcessId;
1138 info->proc = pi.hProcess;
1139 info->next = pinfo;
1140 pinfo = info;
1141 }
1142 LeaveCriticalSection(&pinfo_cs);
1143
1144 return (pid_t)pi.dwProcessId;
1145 }
1146
1147 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1148 {
1149 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1150 }
1151
1152 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1153 const char *dir,
1154 int fhin, int fhout, int fherr)
1155 {
1156 pid_t pid;
1157 char *prog = path_lookup(cmd, 0);
1158
1159 if (!prog) {
1160 errno = ENOENT;
1161 pid = -1;
1162 }
1163 else {
1164 const char *interpr = parse_interpreter(prog);
1165
1166 if (interpr) {
1167 const char *argv0 = argv[0];
1168 char *iprog = path_lookup(interpr, 1);
1169 argv[0] = prog;
1170 if (!iprog) {
1171 errno = ENOENT;
1172 pid = -1;
1173 }
1174 else {
1175 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1176 fhin, fhout, fherr);
1177 free(iprog);
1178 }
1179 argv[0] = argv0;
1180 }
1181 else
1182 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1183 fhin, fhout, fherr);
1184 free(prog);
1185 }
1186 return pid;
1187 }
1188
1189 static int try_shell_exec(const char *cmd, char *const *argv)
1190 {
1191 const char *interpr = parse_interpreter(cmd);
1192 char *prog;
1193 int pid = 0;
1194
1195 if (!interpr)
1196 return 0;
1197 prog = path_lookup(interpr, 1);
1198 if (prog) {
1199 int argc = 0;
1200 const char **argv2;
1201 while (argv[argc]) argc++;
1202 ALLOC_ARRAY(argv2, argc + 1);
1203 argv2[0] = (char *)cmd; /* full path to the script file */
1204 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1205 pid = mingw_spawnv(prog, argv2, 1);
1206 if (pid >= 0) {
1207 int status;
1208 if (waitpid(pid, &status, 0) < 0)
1209 status = 255;
1210 exit(status);
1211 }
1212 pid = 1; /* indicate that we tried but failed */
1213 free(prog);
1214 free(argv2);
1215 }
1216 return pid;
1217 }
1218
1219 int mingw_execv(const char *cmd, char *const *argv)
1220 {
1221 /* check if git_command is a shell script */
1222 if (!try_shell_exec(cmd, argv)) {
1223 int pid, status;
1224
1225 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1226 if (pid < 0)
1227 return -1;
1228 if (waitpid(pid, &status, 0) < 0)
1229 status = 255;
1230 exit(status);
1231 }
1232 return -1;
1233 }
1234
1235 int mingw_execvp(const char *cmd, char *const *argv)
1236 {
1237 char *prog = path_lookup(cmd, 0);
1238
1239 if (prog) {
1240 mingw_execv(prog, argv);
1241 free(prog);
1242 } else
1243 errno = ENOENT;
1244
1245 return -1;
1246 }
1247
1248 int mingw_kill(pid_t pid, int sig)
1249 {
1250 if (pid > 0 && sig == SIGTERM) {
1251 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1252
1253 if (TerminateProcess(h, -1)) {
1254 CloseHandle(h);
1255 return 0;
1256 }
1257
1258 errno = err_win_to_posix(GetLastError());
1259 CloseHandle(h);
1260 return -1;
1261 } else if (pid > 0 && sig == 0) {
1262 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1263 if (h) {
1264 CloseHandle(h);
1265 return 0;
1266 }
1267 }
1268
1269 errno = EINVAL;
1270 return -1;
1271 }
1272
1273 /*
1274 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1275 */
1276 static int compareenv(const void *v1, const void *v2)
1277 {
1278 const char *e1 = *(const char**)v1;
1279 const char *e2 = *(const char**)v2;
1280
1281 for (;;) {
1282 int c1 = *e1++;
1283 int c2 = *e2++;
1284 c1 = (c1 == '=') ? 0 : tolower(c1);
1285 c2 = (c2 == '=') ? 0 : tolower(c2);
1286 if (c1 > c2)
1287 return 1;
1288 if (c1 < c2)
1289 return -1;
1290 if (c1 == 0)
1291 return 0;
1292 }
1293 }
1294
1295 static int bsearchenv(char **env, const char *name, size_t size)
1296 {
1297 unsigned low = 0, high = size;
1298 while (low < high) {
1299 unsigned mid = low + ((high - low) >> 1);
1300 int cmp = compareenv(&env[mid], &name);
1301 if (cmp < 0)
1302 low = mid + 1;
1303 else if (cmp > 0)
1304 high = mid;
1305 else
1306 return mid;
1307 }
1308 return ~low; /* not found, return 1's complement of insert position */
1309 }
1310
1311 /*
1312 * If name contains '=', then sets the variable, otherwise it unsets it
1313 * Size includes the terminating NULL. Env must have room for size + 1 entries
1314 * (in case of insert). Returns the new size. Optionally frees removed entries.
1315 */
1316 static int do_putenv(char **env, const char *name, int size, int free_old)
1317 {
1318 int i = bsearchenv(env, name, size - 1);
1319
1320 /* optionally free removed / replaced entry */
1321 if (i >= 0 && free_old)
1322 free(env[i]);
1323
1324 if (strchr(name, '=')) {
1325 /* if new value ('key=value') is specified, insert or replace entry */
1326 if (i < 0) {
1327 i = ~i;
1328 memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1329 size++;
1330 }
1331 env[i] = (char*) name;
1332 } else if (i >= 0) {
1333 /* otherwise ('key') remove existing entry */
1334 size--;
1335 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1336 }
1337 return size;
1338 }
1339
1340 char *mingw_getenv(const char *name)
1341 {
1342 char *value;
1343 int pos = bsearchenv(environ, name, environ_size - 1);
1344 if (pos < 0)
1345 return NULL;
1346 value = strchr(environ[pos], '=');
1347 return value ? &value[1] : NULL;
1348 }
1349
1350 int mingw_putenv(const char *namevalue)
1351 {
1352 ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1353 environ_size = do_putenv(environ, namevalue, environ_size, 1);
1354 return 0;
1355 }
1356
1357 /*
1358 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1359 * that service contains a numerical port, or that it is null. It
1360 * does a simple search using gethostbyname, and returns one IPv4 host
1361 * if one was found.
1362 */
1363 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1364 const struct addrinfo *hints,
1365 struct addrinfo **res)
1366 {
1367 struct hostent *h = NULL;
1368 struct addrinfo *ai;
1369 struct sockaddr_in *sin;
1370
1371 if (node) {
1372 h = gethostbyname(node);
1373 if (!h)
1374 return WSAGetLastError();
1375 }
1376
1377 ai = xmalloc(sizeof(struct addrinfo));
1378 *res = ai;
1379 ai->ai_flags = 0;
1380 ai->ai_family = AF_INET;
1381 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1382 switch (ai->ai_socktype) {
1383 case SOCK_STREAM:
1384 ai->ai_protocol = IPPROTO_TCP;
1385 break;
1386 case SOCK_DGRAM:
1387 ai->ai_protocol = IPPROTO_UDP;
1388 break;
1389 default:
1390 ai->ai_protocol = 0;
1391 break;
1392 }
1393 ai->ai_addrlen = sizeof(struct sockaddr_in);
1394 if (hints && (hints->ai_flags & AI_CANONNAME))
1395 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1396 else
1397 ai->ai_canonname = NULL;
1398
1399 sin = xcalloc(1, ai->ai_addrlen);
1400 sin->sin_family = AF_INET;
1401 /* Note: getaddrinfo is supposed to allow service to be a string,
1402 * which should be looked up using getservbyname. This is
1403 * currently not implemented */
1404 if (service)
1405 sin->sin_port = htons(atoi(service));
1406 if (h)
1407 sin->sin_addr = *(struct in_addr *)h->h_addr;
1408 else if (hints && (hints->ai_flags & AI_PASSIVE))
1409 sin->sin_addr.s_addr = INADDR_ANY;
1410 else
1411 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1412 ai->ai_addr = (struct sockaddr *)sin;
1413 ai->ai_next = NULL;
1414 return 0;
1415 }
1416
1417 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1418 {
1419 free(res->ai_canonname);
1420 free(res->ai_addr);
1421 free(res);
1422 }
1423
1424 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1425 char *host, DWORD hostlen,
1426 char *serv, DWORD servlen, int flags)
1427 {
1428 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1429 if (sa->sa_family != AF_INET)
1430 return EAI_FAMILY;
1431 if (!host && !serv)
1432 return EAI_NONAME;
1433
1434 if (host && hostlen > 0) {
1435 struct hostent *ent = NULL;
1436 if (!(flags & NI_NUMERICHOST))
1437 ent = gethostbyaddr((const char *)&sin->sin_addr,
1438 sizeof(sin->sin_addr), AF_INET);
1439
1440 if (ent)
1441 snprintf(host, hostlen, "%s", ent->h_name);
1442 else if (flags & NI_NAMEREQD)
1443 return EAI_NONAME;
1444 else
1445 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1446 }
1447
1448 if (serv && servlen > 0) {
1449 struct servent *ent = NULL;
1450 if (!(flags & NI_NUMERICSERV))
1451 ent = getservbyport(sin->sin_port,
1452 flags & NI_DGRAM ? "udp" : "tcp");
1453
1454 if (ent)
1455 snprintf(serv, servlen, "%s", ent->s_name);
1456 else
1457 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1458 }
1459
1460 return 0;
1461 }
1462
1463 static HMODULE ipv6_dll = NULL;
1464 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1465 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1466 const struct addrinfo *hints,
1467 struct addrinfo **res);
1468 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1469 char *host, DWORD hostlen,
1470 char *serv, DWORD servlen, int flags);
1471 /*
1472 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1473 * don't need to try to load that one dynamically.
1474 */
1475
1476 static void socket_cleanup(void)
1477 {
1478 WSACleanup();
1479 if (ipv6_dll)
1480 FreeLibrary(ipv6_dll);
1481 ipv6_dll = NULL;
1482 ipv6_freeaddrinfo = freeaddrinfo_stub;
1483 ipv6_getaddrinfo = getaddrinfo_stub;
1484 ipv6_getnameinfo = getnameinfo_stub;
1485 }
1486
1487 static void ensure_socket_initialization(void)
1488 {
1489 WSADATA wsa;
1490 static int initialized = 0;
1491 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1492 const char **name;
1493
1494 if (initialized)
1495 return;
1496
1497 if (WSAStartup(MAKEWORD(2,2), &wsa))
1498 die("unable to initialize winsock subsystem, error %d",
1499 WSAGetLastError());
1500
1501 for (name = libraries; *name; name++) {
1502 ipv6_dll = LoadLibrary(*name);
1503 if (!ipv6_dll)
1504 continue;
1505
1506 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1507 GetProcAddress(ipv6_dll, "freeaddrinfo");
1508 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1509 const struct addrinfo *,
1510 struct addrinfo **))
1511 GetProcAddress(ipv6_dll, "getaddrinfo");
1512 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1513 socklen_t, char *, DWORD,
1514 char *, DWORD, int))
1515 GetProcAddress(ipv6_dll, "getnameinfo");
1516 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1517 FreeLibrary(ipv6_dll);
1518 ipv6_dll = NULL;
1519 } else
1520 break;
1521 }
1522 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1523 ipv6_freeaddrinfo = freeaddrinfo_stub;
1524 ipv6_getaddrinfo = getaddrinfo_stub;
1525 ipv6_getnameinfo = getnameinfo_stub;
1526 }
1527
1528 atexit(socket_cleanup);
1529 initialized = 1;
1530 }
1531
1532 #undef gethostname
1533 int mingw_gethostname(char *name, int namelen)
1534 {
1535 ensure_socket_initialization();
1536 return gethostname(name, namelen);
1537 }
1538
1539 #undef gethostbyname
1540 struct hostent *mingw_gethostbyname(const char *host)
1541 {
1542 ensure_socket_initialization();
1543 return gethostbyname(host);
1544 }
1545
1546 void mingw_freeaddrinfo(struct addrinfo *res)
1547 {
1548 ipv6_freeaddrinfo(res);
1549 }
1550
1551 int mingw_getaddrinfo(const char *node, const char *service,
1552 const struct addrinfo *hints, struct addrinfo **res)
1553 {
1554 ensure_socket_initialization();
1555 return ipv6_getaddrinfo(node, service, hints, res);
1556 }
1557
1558 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1559 char *host, DWORD hostlen, char *serv, DWORD servlen,
1560 int flags)
1561 {
1562 ensure_socket_initialization();
1563 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1564 }
1565
1566 int mingw_socket(int domain, int type, int protocol)
1567 {
1568 int sockfd;
1569 SOCKET s;
1570
1571 ensure_socket_initialization();
1572 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1573 if (s == INVALID_SOCKET) {
1574 /*
1575 * WSAGetLastError() values are regular BSD error codes
1576 * biased by WSABASEERR.
1577 * However, strerror() does not know about networking
1578 * specific errors, which are values beginning at 38 or so.
1579 * Therefore, we choose to leave the biased error code
1580 * in errno so that _if_ someone looks up the code somewhere,
1581 * then it is at least the number that are usually listed.
1582 */
1583 errno = WSAGetLastError();
1584 return -1;
1585 }
1586 /* convert into a file descriptor */
1587 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1588 closesocket(s);
1589 return error("unable to make a socket file descriptor: %s",
1590 strerror(errno));
1591 }
1592 return sockfd;
1593 }
1594
1595 #undef connect
1596 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1597 {
1598 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1599 return connect(s, sa, sz);
1600 }
1601
1602 #undef bind
1603 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1604 {
1605 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1606 return bind(s, sa, sz);
1607 }
1608
1609 #undef setsockopt
1610 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1611 {
1612 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1613 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1614 }
1615
1616 #undef shutdown
1617 int mingw_shutdown(int sockfd, int how)
1618 {
1619 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1620 return shutdown(s, how);
1621 }
1622
1623 #undef listen
1624 int mingw_listen(int sockfd, int backlog)
1625 {
1626 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1627 return listen(s, backlog);
1628 }
1629
1630 #undef accept
1631 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1632 {
1633 int sockfd2;
1634
1635 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1636 SOCKET s2 = accept(s1, sa, sz);
1637
1638 /* convert into a file descriptor */
1639 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1640 int err = errno;
1641 closesocket(s2);
1642 return error("unable to make a socket file descriptor: %s",
1643 strerror(err));
1644 }
1645 return sockfd2;
1646 }
1647
1648 #undef rename
1649 int mingw_rename(const char *pold, const char *pnew)
1650 {
1651 DWORD attrs, gle;
1652 int tries = 0;
1653 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1654 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1655 return -1;
1656
1657 /*
1658 * Try native rename() first to get errno right.
1659 * It is based on MoveFile(), which cannot overwrite existing files.
1660 */
1661 if (!_wrename(wpold, wpnew))
1662 return 0;
1663 if (errno != EEXIST)
1664 return -1;
1665 repeat:
1666 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1667 return 0;
1668 /* TODO: translate more errors */
1669 gle = GetLastError();
1670 if (gle == ERROR_ACCESS_DENIED &&
1671 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1672 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1673 DWORD attrsold = GetFileAttributesW(wpold);
1674 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1675 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1676 errno = EISDIR;
1677 else if (!_wrmdir(wpnew))
1678 goto repeat;
1679 return -1;
1680 }
1681 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1682 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1683 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1684 return 0;
1685 gle = GetLastError();
1686 /* revert file attributes on failure */
1687 SetFileAttributesW(wpnew, attrs);
1688 }
1689 }
1690 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1691 /*
1692 * We assume that some other process had the source or
1693 * destination file open at the wrong moment and retry.
1694 * In order to give the other process a higher chance to
1695 * complete its operation, we give up our time slice now.
1696 * If we have to retry again, we do sleep a bit.
1697 */
1698 Sleep(delay[tries]);
1699 tries++;
1700 goto repeat;
1701 }
1702 if (gle == ERROR_ACCESS_DENIED &&
1703 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1704 "Should I try again?", pold, pnew))
1705 goto repeat;
1706
1707 errno = EACCES;
1708 return -1;
1709 }
1710
1711 /*
1712 * Note that this doesn't return the actual pagesize, but
1713 * the allocation granularity. If future Windows specific git code
1714 * needs the real getpagesize function, we need to find another solution.
1715 */
1716 int mingw_getpagesize(void)
1717 {
1718 SYSTEM_INFO si;
1719 GetSystemInfo(&si);
1720 return si.dwAllocationGranularity;
1721 }
1722
1723 struct passwd *getpwuid(int uid)
1724 {
1725 static char user_name[100];
1726 static struct passwd p;
1727
1728 DWORD len = sizeof(user_name);
1729 if (!GetUserName(user_name, &len))
1730 return NULL;
1731 p.pw_name = user_name;
1732 p.pw_gecos = "unknown";
1733 p.pw_dir = NULL;
1734 return &p;
1735 }
1736
1737 static HANDLE timer_event;
1738 static HANDLE timer_thread;
1739 static int timer_interval;
1740 static int one_shot;
1741 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1742
1743 /* The timer works like this:
1744 * The thread, ticktack(), is a trivial routine that most of the time
1745 * only waits to receive the signal to terminate. The main thread tells
1746 * the thread to terminate by setting the timer_event to the signalled
1747 * state.
1748 * But ticktack() interrupts the wait state after the timer's interval
1749 * length to call the signal handler.
1750 */
1751
1752 static unsigned __stdcall ticktack(void *dummy)
1753 {
1754 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1755 mingw_raise(SIGALRM);
1756 if (one_shot)
1757 break;
1758 }
1759 return 0;
1760 }
1761
1762 static int start_timer_thread(void)
1763 {
1764 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1765 if (timer_event) {
1766 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1767 if (!timer_thread )
1768 return errno = ENOMEM,
1769 error("cannot start timer thread");
1770 } else
1771 return errno = ENOMEM,
1772 error("cannot allocate resources for timer");
1773 return 0;
1774 }
1775
1776 static void stop_timer_thread(void)
1777 {
1778 if (timer_event)
1779 SetEvent(timer_event); /* tell thread to terminate */
1780 if (timer_thread) {
1781 int rc = WaitForSingleObject(timer_thread, 1000);
1782 if (rc == WAIT_TIMEOUT)
1783 error("timer thread did not terminate timely");
1784 else if (rc != WAIT_OBJECT_0)
1785 error("waiting for timer thread failed: %lu",
1786 GetLastError());
1787 CloseHandle(timer_thread);
1788 }
1789 if (timer_event)
1790 CloseHandle(timer_event);
1791 timer_event = NULL;
1792 timer_thread = NULL;
1793 }
1794
1795 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1796 {
1797 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1798 }
1799
1800 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1801 {
1802 static const struct timeval zero;
1803 static int atexit_done;
1804
1805 if (out != NULL)
1806 return errno = EINVAL,
1807 error("setitimer param 3 != NULL not implemented");
1808 if (!is_timeval_eq(&in->it_interval, &zero) &&
1809 !is_timeval_eq(&in->it_interval, &in->it_value))
1810 return errno = EINVAL,
1811 error("setitimer: it_interval must be zero or eq it_value");
1812
1813 if (timer_thread)
1814 stop_timer_thread();
1815
1816 if (is_timeval_eq(&in->it_value, &zero) &&
1817 is_timeval_eq(&in->it_interval, &zero))
1818 return 0;
1819
1820 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1821 one_shot = is_timeval_eq(&in->it_interval, &zero);
1822 if (!atexit_done) {
1823 atexit(stop_timer_thread);
1824 atexit_done = 1;
1825 }
1826 return start_timer_thread();
1827 }
1828
1829 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1830 {
1831 if (sig != SIGALRM)
1832 return errno = EINVAL,
1833 error("sigaction only implemented for SIGALRM");
1834 if (out != NULL)
1835 return errno = EINVAL,
1836 error("sigaction: param 3 != NULL not implemented");
1837
1838 timer_fn = in->sa_handler;
1839 return 0;
1840 }
1841
1842 #undef signal
1843 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1844 {
1845 sig_handler_t old;
1846
1847 switch (sig) {
1848 case SIGALRM:
1849 old = timer_fn;
1850 timer_fn = handler;
1851 break;
1852
1853 case SIGINT:
1854 old = sigint_fn;
1855 sigint_fn = handler;
1856 break;
1857
1858 default:
1859 return signal(sig, handler);
1860 }
1861
1862 return old;
1863 }
1864
1865 #undef raise
1866 int mingw_raise(int sig)
1867 {
1868 switch (sig) {
1869 case SIGALRM:
1870 if (timer_fn == SIG_DFL) {
1871 if (isatty(STDERR_FILENO))
1872 fputs("Alarm clock\n", stderr);
1873 exit(128 + SIGALRM);
1874 } else if (timer_fn != SIG_IGN)
1875 timer_fn(SIGALRM);
1876 return 0;
1877
1878 case SIGINT:
1879 if (sigint_fn == SIG_DFL)
1880 exit(128 + SIGINT);
1881 else if (sigint_fn != SIG_IGN)
1882 sigint_fn(SIGINT);
1883 return 0;
1884
1885 default:
1886 return raise(sig);
1887 }
1888 }
1889
1890 int link(const char *oldpath, const char *newpath)
1891 {
1892 typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1893 static T create_hard_link = NULL;
1894 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1895 if (xutftowcs_path(woldpath, oldpath) < 0 ||
1896 xutftowcs_path(wnewpath, newpath) < 0)
1897 return -1;
1898
1899 if (!create_hard_link) {
1900 create_hard_link = (T) GetProcAddress(
1901 GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1902 if (!create_hard_link)
1903 create_hard_link = (T)-1;
1904 }
1905 if (create_hard_link == (T)-1) {
1906 errno = ENOSYS;
1907 return -1;
1908 }
1909 if (!create_hard_link(wnewpath, woldpath, NULL)) {
1910 errno = err_win_to_posix(GetLastError());
1911 return -1;
1912 }
1913 return 0;
1914 }
1915
1916 pid_t waitpid(pid_t pid, int *status, int options)
1917 {
1918 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1919 FALSE, pid);
1920 if (!h) {
1921 errno = ECHILD;
1922 return -1;
1923 }
1924
1925 if (pid > 0 && options & WNOHANG) {
1926 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1927 CloseHandle(h);
1928 return 0;
1929 }
1930 options &= ~WNOHANG;
1931 }
1932
1933 if (options == 0) {
1934 struct pinfo_t **ppinfo;
1935 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1936 CloseHandle(h);
1937 return 0;
1938 }
1939
1940 if (status)
1941 GetExitCodeProcess(h, (LPDWORD)status);
1942
1943 EnterCriticalSection(&pinfo_cs);
1944
1945 ppinfo = &pinfo;
1946 while (*ppinfo) {
1947 struct pinfo_t *info = *ppinfo;
1948 if (info->pid == pid) {
1949 CloseHandle(info->proc);
1950 *ppinfo = info->next;
1951 free(info);
1952 break;
1953 }
1954 ppinfo = &info->next;
1955 }
1956
1957 LeaveCriticalSection(&pinfo_cs);
1958
1959 CloseHandle(h);
1960 return pid;
1961 }
1962 CloseHandle(h);
1963
1964 errno = EINVAL;
1965 return -1;
1966 }
1967
1968 int mingw_skip_dos_drive_prefix(char **path)
1969 {
1970 int ret = has_dos_drive_prefix(*path);
1971 *path += ret;
1972 return ret;
1973 }
1974
1975 int mingw_offset_1st_component(const char *path)
1976 {
1977 char *pos = (char *)path;
1978
1979 /* unc paths */
1980 if (!skip_dos_drive_prefix(&pos) &&
1981 is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
1982 /* skip server name */
1983 pos = strpbrk(pos + 2, "\\/");
1984 if (!pos)
1985 return 0; /* Error: malformed unc path */
1986
1987 do {
1988 pos++;
1989 } while (*pos && !is_dir_sep(*pos));
1990 }
1991
1992 return pos + is_dir_sep(*pos) - path;
1993 }
1994
1995 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1996 {
1997 int upos = 0, wpos = 0;
1998 const unsigned char *utf = (const unsigned char*) utfs;
1999 if (!utf || !wcs || wcslen < 1) {
2000 errno = EINVAL;
2001 return -1;
2002 }
2003 /* reserve space for \0 */
2004 wcslen--;
2005 if (utflen < 0)
2006 utflen = INT_MAX;
2007
2008 while (upos < utflen) {
2009 int c = utf[upos++] & 0xff;
2010 if (utflen == INT_MAX && c == 0)
2011 break;
2012
2013 if (wpos >= wcslen) {
2014 wcs[wpos] = 0;
2015 errno = ERANGE;
2016 return -1;
2017 }
2018
2019 if (c < 0x80) {
2020 /* ASCII */
2021 wcs[wpos++] = c;
2022 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2023 (utf[upos] & 0xc0) == 0x80) {
2024 /* 2-byte utf-8 */
2025 c = ((c & 0x1f) << 6);
2026 c |= (utf[upos++] & 0x3f);
2027 wcs[wpos++] = c;
2028 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2029 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2030 (utf[upos] & 0xc0) == 0x80 &&
2031 (utf[upos + 1] & 0xc0) == 0x80) {
2032 /* 3-byte utf-8 */
2033 c = ((c & 0x0f) << 12);
2034 c |= ((utf[upos++] & 0x3f) << 6);
2035 c |= (utf[upos++] & 0x3f);
2036 wcs[wpos++] = c;
2037 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2038 wpos + 1 < wcslen &&
2039 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2040 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2041 (utf[upos] & 0xc0) == 0x80 &&
2042 (utf[upos + 1] & 0xc0) == 0x80 &&
2043 (utf[upos + 2] & 0xc0) == 0x80) {
2044 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2045 c = ((c & 0x07) << 18);
2046 c |= ((utf[upos++] & 0x3f) << 12);
2047 c |= ((utf[upos++] & 0x3f) << 6);
2048 c |= (utf[upos++] & 0x3f);
2049 c -= 0x10000;
2050 wcs[wpos++] = 0xd800 | (c >> 10);
2051 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2052 } else if (c >= 0xa0) {
2053 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2054 wcs[wpos++] = c;
2055 } else {
2056 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2057 static const char *hex = "0123456789abcdef";
2058 wcs[wpos++] = hex[c >> 4];
2059 if (wpos < wcslen)
2060 wcs[wpos++] = hex[c & 0x0f];
2061 }
2062 }
2063 wcs[wpos] = 0;
2064 return wpos;
2065 }
2066
2067 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2068 {
2069 if (!wcs || !utf || utflen < 1) {
2070 errno = EINVAL;
2071 return -1;
2072 }
2073 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2074 if (utflen)
2075 return utflen - 1;
2076 errno = ERANGE;
2077 return -1;
2078 }
2079
2080 static void setup_windows_environment(void)
2081 {
2082 char *tmp = getenv("TMPDIR");
2083
2084 /* on Windows it is TMP and TEMP */
2085 if (!tmp) {
2086 if (!(tmp = getenv("TMP")))
2087 tmp = getenv("TEMP");
2088 if (tmp) {
2089 setenv("TMPDIR", tmp, 1);
2090 tmp = getenv("TMPDIR");
2091 }
2092 }
2093
2094 if (tmp) {
2095 /*
2096 * Convert all dir separators to forward slashes,
2097 * to help shell commands called from the Git
2098 * executable (by not mistaking the dir separators
2099 * for escape characters).
2100 */
2101 convert_slashes(tmp);
2102 }
2103
2104 /* simulate TERM to enable auto-color (see color.c) */
2105 if (!getenv("TERM"))
2106 setenv("TERM", "cygwin", 1);
2107 }
2108
2109 /*
2110 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2111 * mingw startup code, see init.c in mingw runtime).
2112 */
2113 int _CRT_glob = 0;
2114
2115 typedef struct {
2116 int newmode;
2117 } _startupinfo;
2118
2119 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2120 _startupinfo *si);
2121
2122 static NORETURN void die_startup(void)
2123 {
2124 fputs("fatal: not enough memory for initialization", stderr);
2125 exit(128);
2126 }
2127
2128 static void *malloc_startup(size_t size)
2129 {
2130 void *result = malloc(size);
2131 if (!result)
2132 die_startup();
2133 return result;
2134 }
2135
2136 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2137 {
2138 len = xwcstoutf(buffer, wcs, len) + 1;
2139 return memcpy(malloc_startup(len), buffer, len);
2140 }
2141
2142 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2143 DWORD desired_access, DWORD flags)
2144 {
2145 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2146 wchar_t buf[MAX_PATH];
2147 DWORD max = ARRAY_SIZE(buf);
2148 HANDLE handle;
2149 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2150
2151 if (!ret || ret >= max)
2152 return;
2153
2154 /* make sure this does not leak into child processes */
2155 SetEnvironmentVariableW(key, NULL);
2156 if (!wcscmp(buf, L"off")) {
2157 close(fd);
2158 handle = GetStdHandle(std_id);
2159 if (handle != INVALID_HANDLE_VALUE)
2160 CloseHandle(handle);
2161 return;
2162 }
2163 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2164 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2165 if (handle == INVALID_HANDLE_VALUE) {
2166 close(fd);
2167 handle = GetStdHandle(std_id);
2168 if (handle != INVALID_HANDLE_VALUE)
2169 CloseHandle(handle);
2170 } else {
2171 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2172 SetStdHandle(std_id, handle);
2173 dup2(new_fd, fd);
2174 /* do *not* close the new_fd: that would close stdout */
2175 }
2176 return;
2177 }
2178 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2179 flags, NULL);
2180 if (handle != INVALID_HANDLE_VALUE) {
2181 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2182 SetStdHandle(std_id, handle);
2183 dup2(new_fd, fd);
2184 close(new_fd);
2185 }
2186 }
2187
2188 static void maybe_redirect_std_handles(void)
2189 {
2190 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2191 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2192 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2193 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2194 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2195 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2196 }
2197
2198 void mingw_startup(void)
2199 {
2200 int i, maxlen, argc;
2201 char *buffer;
2202 wchar_t **wenv, **wargv;
2203 _startupinfo si;
2204
2205 maybe_redirect_std_handles();
2206
2207 /* get wide char arguments and environment */
2208 si.newmode = 0;
2209 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2210 die_startup();
2211
2212 /* determine size of argv and environ conversion buffer */
2213 maxlen = wcslen(_wpgmptr);
2214 for (i = 1; i < argc; i++)
2215 maxlen = max(maxlen, wcslen(wargv[i]));
2216 for (i = 0; wenv[i]; i++)
2217 maxlen = max(maxlen, wcslen(wenv[i]));
2218
2219 /*
2220 * nedmalloc can't free CRT memory, allocate resizable environment
2221 * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2222 * use it while initializing the environment itself.
2223 */
2224 environ_size = i + 1;
2225 environ_alloc = alloc_nr(environ_size * sizeof(char*));
2226 environ = malloc_startup(environ_alloc);
2227
2228 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2229 maxlen = 3 * maxlen + 1;
2230 buffer = malloc_startup(maxlen);
2231
2232 /* convert command line arguments and environment to UTF-8 */
2233 __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2234 for (i = 1; i < argc; i++)
2235 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2236 for (i = 0; wenv[i]; i++)
2237 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2238 environ[i] = NULL;
2239 free(buffer);
2240
2241 /* sort environment for O(log n) getenv / putenv */
2242 qsort(environ, i, sizeof(char*), compareenv);
2243
2244 /* fix Windows specific environment settings */
2245 setup_windows_environment();
2246
2247 /* initialize critical section for waitpid pinfo_t list */
2248 InitializeCriticalSection(&pinfo_cs);
2249
2250 /* set up default file mode and file modes for stdin/out/err */
2251 _fmode = _O_BINARY;
2252 _setmode(_fileno(stdin), _O_BINARY);
2253 _setmode(_fileno(stdout), _O_BINARY);
2254 _setmode(_fileno(stderr), _O_BINARY);
2255
2256 /* initialize Unicode console */
2257 winansi_init();
2258 }
2259
2260 int uname(struct utsname *buf)
2261 {
2262 unsigned v = (unsigned)GetVersion();
2263 memset(buf, 0, sizeof(*buf));
2264 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2265 xsnprintf(buf->release, sizeof(buf->release),
2266 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2267 /* assuming NT variants only.. */
2268 xsnprintf(buf->version, sizeof(buf->version),
2269 "%u", (v >> 16) & 0x7fff);
2270 return 0;
2271 }
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