Windows: avoid the "dup dance" when spawning a child process
[git/git.git] / compat / mingw.c
1 #include "../git-compat-util.h"
2 #include "win32.h"
3 #include <conio.h>
4 #include "../strbuf.h"
5
6 static int err_win_to_posix(DWORD winerr)
7 {
8 int error = ENOSYS;
9 switch(winerr) {
10 case ERROR_ACCESS_DENIED: error = EACCES; break;
11 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
12 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
13 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
14 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
15 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
16 case ERROR_BAD_COMMAND: error = EIO; break;
17 case ERROR_BAD_DEVICE: error = ENODEV; break;
18 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
19 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
20 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
21 case ERROR_BAD_LENGTH: error = EINVAL; break;
22 case ERROR_BAD_PATHNAME: error = ENOENT; break;
23 case ERROR_BAD_PIPE: error = EPIPE; break;
24 case ERROR_BAD_UNIT: error = ENODEV; break;
25 case ERROR_BAD_USERNAME: error = EINVAL; break;
26 case ERROR_BROKEN_PIPE: error = EPIPE; break;
27 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
28 case ERROR_BUSY: error = EBUSY; break;
29 case ERROR_BUSY_DRIVE: error = EBUSY; break;
30 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
31 case ERROR_CANNOT_MAKE: error = EACCES; break;
32 case ERROR_CANTOPEN: error = EIO; break;
33 case ERROR_CANTREAD: error = EIO; break;
34 case ERROR_CANTWRITE: error = EIO; break;
35 case ERROR_CRC: error = EIO; break;
36 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
37 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
38 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
39 case ERROR_DIRECTORY: error = EINVAL; break;
40 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
41 case ERROR_DISK_CHANGE: error = EIO; break;
42 case ERROR_DISK_FULL: error = ENOSPC; break;
43 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
44 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
45 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
46 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
47 case ERROR_FILE_EXISTS: error = EEXIST; break;
48 case ERROR_FILE_INVALID: error = ENODEV; break;
49 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
50 case ERROR_GEN_FAILURE: error = EIO; break;
51 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
52 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
53 case ERROR_INVALID_ACCESS: error = EACCES; break;
54 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
55 case ERROR_INVALID_BLOCK: error = EFAULT; break;
56 case ERROR_INVALID_DATA: error = EINVAL; break;
57 case ERROR_INVALID_DRIVE: error = ENODEV; break;
58 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
59 case ERROR_INVALID_FLAGS: error = EINVAL; break;
60 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
61 case ERROR_INVALID_HANDLE: error = EBADF; break;
62 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
63 case ERROR_INVALID_NAME: error = EINVAL; break;
64 case ERROR_INVALID_OWNER: error = EINVAL; break;
65 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
66 case ERROR_INVALID_PASSWORD: error = EPERM; break;
67 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
68 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
69 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
70 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
71 case ERROR_IO_DEVICE: error = EIO; break;
72 case ERROR_IO_INCOMPLETE: error = EINTR; break;
73 case ERROR_LOCKED: error = EBUSY; break;
74 case ERROR_LOCK_VIOLATION: error = EACCES; break;
75 case ERROR_LOGON_FAILURE: error = EACCES; break;
76 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
77 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
78 case ERROR_MORE_DATA: error = EPIPE; break;
79 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
80 case ERROR_NOACCESS: error = EFAULT; break;
81 case ERROR_NONE_MAPPED: error = EINVAL; break;
82 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
83 case ERROR_NOT_READY: error = EAGAIN; break;
84 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
85 case ERROR_NO_DATA: error = EPIPE; break;
86 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
87 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
88 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
89 case ERROR_OPEN_FAILED: error = EIO; break;
90 case ERROR_OPEN_FILES: error = EBUSY; break;
91 case ERROR_OPERATION_ABORTED: error = EINTR; break;
92 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
93 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
94 case ERROR_PATH_BUSY: error = EBUSY; break;
95 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
96 case ERROR_PIPE_BUSY: error = EBUSY; break;
97 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
98 case ERROR_PIPE_LISTENING: error = EPIPE; break;
99 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
100 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
101 case ERROR_READ_FAULT: error = EIO; break;
102 case ERROR_SEEK: error = EIO; break;
103 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
104 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
105 case ERROR_SHARING_VIOLATION: error = EACCES; break;
106 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
107 case ERROR_SWAPERROR: error = ENOENT; break;
108 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
109 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
110 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
111 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
112 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
113 case ERROR_WRITE_FAULT: error = EIO; break;
114 case ERROR_WRITE_PROTECT: error = EROFS; break;
115 }
116 return error;
117 }
118
119 #undef open
120 int mingw_open (const char *filename, int oflags, ...)
121 {
122 va_list args;
123 unsigned mode;
124 int fd;
125
126 va_start(args, oflags);
127 mode = va_arg(args, int);
128 va_end(args);
129
130 if (!strcmp(filename, "/dev/null"))
131 filename = "nul";
132
133 fd = open(filename, oflags, mode);
134
135 if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
136 DWORD attrs = GetFileAttributes(filename);
137 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
138 errno = EISDIR;
139 }
140 return fd;
141 }
142
143 static inline time_t filetime_to_time_t(const FILETIME *ft)
144 {
145 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
146 winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
147 winTime /= 10000000; /* Nano to seconds resolution */
148 return (time_t)winTime;
149 }
150
151 /* We keep the do_lstat code in a separate function to avoid recursion.
152 * When a path ends with a slash, the stat will fail with ENOENT. In
153 * this case, we strip the trailing slashes and stat again.
154 */
155 static int do_lstat(const char *file_name, struct stat *buf)
156 {
157 WIN32_FILE_ATTRIBUTE_DATA fdata;
158
159 if (!(errno = get_file_attr(file_name, &fdata))) {
160 buf->st_ino = 0;
161 buf->st_gid = 0;
162 buf->st_uid = 0;
163 buf->st_nlink = 1;
164 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
165 buf->st_size = fdata.nFileSizeLow |
166 (((off_t)fdata.nFileSizeHigh)<<32);
167 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
168 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
169 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
170 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
171 return 0;
172 }
173 return -1;
174 }
175
176 /* We provide our own lstat/fstat functions, since the provided
177 * lstat/fstat functions are so slow. These stat functions are
178 * tailored for Git's usage (read: fast), and are not meant to be
179 * complete. Note that Git stat()s are redirected to mingw_lstat()
180 * too, since Windows doesn't really handle symlinks that well.
181 */
182 int mingw_lstat(const char *file_name, struct stat *buf)
183 {
184 int namelen;
185 static char alt_name[PATH_MAX];
186
187 if (!do_lstat(file_name, buf))
188 return 0;
189
190 /* if file_name ended in a '/', Windows returned ENOENT;
191 * try again without trailing slashes
192 */
193 if (errno != ENOENT)
194 return -1;
195
196 namelen = strlen(file_name);
197 if (namelen && file_name[namelen-1] != '/')
198 return -1;
199 while (namelen && file_name[namelen-1] == '/')
200 --namelen;
201 if (!namelen || namelen >= PATH_MAX)
202 return -1;
203
204 memcpy(alt_name, file_name, namelen);
205 alt_name[namelen] = 0;
206 return do_lstat(alt_name, buf);
207 }
208
209 #undef fstat
210 int mingw_fstat(int fd, struct stat *buf)
211 {
212 HANDLE fh = (HANDLE)_get_osfhandle(fd);
213 BY_HANDLE_FILE_INFORMATION fdata;
214
215 if (fh == INVALID_HANDLE_VALUE) {
216 errno = EBADF;
217 return -1;
218 }
219 /* direct non-file handles to MS's fstat() */
220 if (GetFileType(fh) != FILE_TYPE_DISK)
221 return _fstati64(fd, buf);
222
223 if (GetFileInformationByHandle(fh, &fdata)) {
224 buf->st_ino = 0;
225 buf->st_gid = 0;
226 buf->st_uid = 0;
227 buf->st_nlink = 1;
228 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
229 buf->st_size = fdata.nFileSizeLow |
230 (((off_t)fdata.nFileSizeHigh)<<32);
231 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
232 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
233 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
234 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
235 return 0;
236 }
237 errno = EBADF;
238 return -1;
239 }
240
241 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
242 {
243 long long winTime = t * 10000000LL + 116444736000000000LL;
244 ft->dwLowDateTime = winTime;
245 ft->dwHighDateTime = winTime >> 32;
246 }
247
248 int mingw_utime (const char *file_name, const struct utimbuf *times)
249 {
250 FILETIME mft, aft;
251 int fh, rc;
252
253 /* must have write permission */
254 if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
255 return -1;
256
257 time_t_to_filetime(times->modtime, &mft);
258 time_t_to_filetime(times->actime, &aft);
259 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
260 errno = EINVAL;
261 rc = -1;
262 } else
263 rc = 0;
264 close(fh);
265 return rc;
266 }
267
268 unsigned int sleep (unsigned int seconds)
269 {
270 Sleep(seconds*1000);
271 return 0;
272 }
273
274 int mkstemp(char *template)
275 {
276 char *filename = mktemp(template);
277 if (filename == NULL)
278 return -1;
279 return open(filename, O_RDWR | O_CREAT, 0600);
280 }
281
282 int gettimeofday(struct timeval *tv, void *tz)
283 {
284 SYSTEMTIME st;
285 struct tm tm;
286 GetSystemTime(&st);
287 tm.tm_year = st.wYear-1900;
288 tm.tm_mon = st.wMonth-1;
289 tm.tm_mday = st.wDay;
290 tm.tm_hour = st.wHour;
291 tm.tm_min = st.wMinute;
292 tm.tm_sec = st.wSecond;
293 tv->tv_sec = tm_to_time_t(&tm);
294 if (tv->tv_sec < 0)
295 return -1;
296 tv->tv_usec = st.wMilliseconds*1000;
297 return 0;
298 }
299
300 int pipe(int filedes[2])
301 {
302 HANDLE h[2];
303
304 /* this creates non-inheritable handles */
305 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
306 errno = err_win_to_posix(GetLastError());
307 return -1;
308 }
309 filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
310 if (filedes[0] < 0) {
311 CloseHandle(h[0]);
312 CloseHandle(h[1]);
313 return -1;
314 }
315 filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
316 if (filedes[0] < 0) {
317 close(filedes[0]);
318 CloseHandle(h[1]);
319 return -1;
320 }
321 return 0;
322 }
323
324 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
325 {
326 int i, pending;
327
328 if (timeout >= 0) {
329 if (nfds == 0) {
330 Sleep(timeout);
331 return 0;
332 }
333 return errno = EINVAL, error("poll timeout not supported");
334 }
335
336 /* When there is only one fd to wait for, then we pretend that
337 * input is available and let the actual wait happen when the
338 * caller invokes read().
339 */
340 if (nfds == 1) {
341 if (!(ufds[0].events & POLLIN))
342 return errno = EINVAL, error("POLLIN not set");
343 ufds[0].revents = POLLIN;
344 return 0;
345 }
346
347 repeat:
348 pending = 0;
349 for (i = 0; i < nfds; i++) {
350 DWORD avail = 0;
351 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
352 if (h == INVALID_HANDLE_VALUE)
353 return -1; /* errno was set */
354
355 if (!(ufds[i].events & POLLIN))
356 return errno = EINVAL, error("POLLIN not set");
357
358 /* this emulation works only for pipes */
359 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
360 int err = GetLastError();
361 if (err == ERROR_BROKEN_PIPE) {
362 ufds[i].revents = POLLHUP;
363 pending++;
364 } else {
365 errno = EINVAL;
366 return error("PeekNamedPipe failed,"
367 " GetLastError: %u", err);
368 }
369 } else if (avail) {
370 ufds[i].revents = POLLIN;
371 pending++;
372 } else
373 ufds[i].revents = 0;
374 }
375 if (!pending) {
376 /* The only times that we spin here is when the process
377 * that is connected through the pipes is waiting for
378 * its own input data to become available. But since
379 * the process (pack-objects) is itself CPU intensive,
380 * it will happily pick up the time slice that we are
381 * relinquishing here.
382 */
383 Sleep(0);
384 goto repeat;
385 }
386 return 0;
387 }
388
389 struct tm *gmtime_r(const time_t *timep, struct tm *result)
390 {
391 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
392 memcpy(result, gmtime(timep), sizeof(struct tm));
393 return result;
394 }
395
396 struct tm *localtime_r(const time_t *timep, struct tm *result)
397 {
398 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
399 memcpy(result, localtime(timep), sizeof(struct tm));
400 return result;
401 }
402
403 #undef getcwd
404 char *mingw_getcwd(char *pointer, int len)
405 {
406 int i;
407 char *ret = getcwd(pointer, len);
408 if (!ret)
409 return ret;
410 for (i = 0; pointer[i]; i++)
411 if (pointer[i] == '\\')
412 pointer[i] = '/';
413 return ret;
414 }
415
416 #undef getenv
417 char *mingw_getenv(const char *name)
418 {
419 char *result = getenv(name);
420 if (!result && !strcmp(name, "TMPDIR")) {
421 /* on Windows it is TMP and TEMP */
422 result = getenv("TMP");
423 if (!result)
424 result = getenv("TEMP");
425 }
426 return result;
427 }
428
429 /*
430 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
431 * (Parsing C++ Command-Line Arguments)
432 */
433 static const char *quote_arg(const char *arg)
434 {
435 /* count chars to quote */
436 int len = 0, n = 0;
437 int force_quotes = 0;
438 char *q, *d;
439 const char *p = arg;
440 if (!*p) force_quotes = 1;
441 while (*p) {
442 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
443 force_quotes = 1;
444 else if (*p == '"')
445 n++;
446 else if (*p == '\\') {
447 int count = 0;
448 while (*p == '\\') {
449 count++;
450 p++;
451 len++;
452 }
453 if (*p == '"')
454 n += count*2 + 1;
455 continue;
456 }
457 len++;
458 p++;
459 }
460 if (!force_quotes && n == 0)
461 return arg;
462
463 /* insert \ where necessary */
464 d = q = xmalloc(len+n+3);
465 *d++ = '"';
466 while (*arg) {
467 if (*arg == '"')
468 *d++ = '\\';
469 else if (*arg == '\\') {
470 int count = 0;
471 while (*arg == '\\') {
472 count++;
473 *d++ = *arg++;
474 }
475 if (*arg == '"') {
476 while (count-- > 0)
477 *d++ = '\\';
478 *d++ = '\\';
479 }
480 }
481 *d++ = *arg++;
482 }
483 *d++ = '"';
484 *d++ = 0;
485 return q;
486 }
487
488 static const char *parse_interpreter(const char *cmd)
489 {
490 static char buf[100];
491 char *p, *opt;
492 int n, fd;
493
494 /* don't even try a .exe */
495 n = strlen(cmd);
496 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
497 return NULL;
498
499 fd = open(cmd, O_RDONLY);
500 if (fd < 0)
501 return NULL;
502 n = read(fd, buf, sizeof(buf)-1);
503 close(fd);
504 if (n < 4) /* at least '#!/x' and not error */
505 return NULL;
506
507 if (buf[0] != '#' || buf[1] != '!')
508 return NULL;
509 buf[n] = '\0';
510 p = buf + strcspn(buf, "\r\n");
511 if (!*p)
512 return NULL;
513
514 *p = '\0';
515 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
516 return NULL;
517 /* strip options */
518 if ((opt = strchr(p+1, ' ')))
519 *opt = '\0';
520 return p+1;
521 }
522
523 /*
524 * Splits the PATH into parts.
525 */
526 static char **get_path_split(void)
527 {
528 char *p, **path, *envpath = getenv("PATH");
529 int i, n = 0;
530
531 if (!envpath || !*envpath)
532 return NULL;
533
534 envpath = xstrdup(envpath);
535 p = envpath;
536 while (p) {
537 char *dir = p;
538 p = strchr(p, ';');
539 if (p) *p++ = '\0';
540 if (*dir) { /* not earlier, catches series of ; */
541 ++n;
542 }
543 }
544 if (!n)
545 return NULL;
546
547 path = xmalloc((n+1)*sizeof(char *));
548 p = envpath;
549 i = 0;
550 do {
551 if (*p)
552 path[i++] = xstrdup(p);
553 p = p+strlen(p)+1;
554 } while (i < n);
555 path[i] = NULL;
556
557 free(envpath);
558
559 return path;
560 }
561
562 static void free_path_split(char **path)
563 {
564 char **p = path;
565
566 if (!path)
567 return;
568
569 while (*p)
570 free(*p++);
571 free(path);
572 }
573
574 /*
575 * exe_only means that we only want to detect .exe files, but not scripts
576 * (which do not have an extension)
577 */
578 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
579 {
580 char path[MAX_PATH];
581 snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
582
583 if (!isexe && access(path, F_OK) == 0)
584 return xstrdup(path);
585 path[strlen(path)-4] = '\0';
586 if ((!exe_only || isexe) && access(path, F_OK) == 0)
587 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
588 return xstrdup(path);
589 return NULL;
590 }
591
592 /*
593 * Determines the absolute path of cmd using the the split path in path.
594 * If cmd contains a slash or backslash, no lookup is performed.
595 */
596 static char *path_lookup(const char *cmd, char **path, int exe_only)
597 {
598 char *prog = NULL;
599 int len = strlen(cmd);
600 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
601
602 if (strchr(cmd, '/') || strchr(cmd, '\\'))
603 prog = xstrdup(cmd);
604
605 while (!prog && *path)
606 prog = lookup_prog(*path++, cmd, isexe, exe_only);
607
608 return prog;
609 }
610
611 static int env_compare(const void *a, const void *b)
612 {
613 char *const *ea = a;
614 char *const *eb = b;
615 return strcasecmp(*ea, *eb);
616 }
617
618 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
619 int prepend_cmd, int fhin, int fhout, int fherr)
620 {
621 STARTUPINFO si;
622 PROCESS_INFORMATION pi;
623 struct strbuf envblk, args;
624 unsigned flags;
625 BOOL ret;
626
627 /* Determine whether or not we are associated to a console */
628 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
629 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
630 FILE_ATTRIBUTE_NORMAL, NULL);
631 if (cons == INVALID_HANDLE_VALUE) {
632 /* There is no console associated with this process.
633 * Since the child is a console process, Windows
634 * would normally create a console window. But
635 * since we'll be redirecting std streams, we do
636 * not need the console.
637 * It is necessary to use DETACHED_PROCESS
638 * instead of CREATE_NO_WINDOW to make ssh
639 * recognize that it has no console.
640 */
641 flags = DETACHED_PROCESS;
642 } else {
643 /* There is already a console. If we specified
644 * DETACHED_PROCESS here, too, Windows would
645 * disassociate the child from the console.
646 * The same is true for CREATE_NO_WINDOW.
647 * Go figure!
648 */
649 flags = 0;
650 CloseHandle(cons);
651 }
652 memset(&si, 0, sizeof(si));
653 si.cb = sizeof(si);
654 si.dwFlags = STARTF_USESTDHANDLES;
655 si.hStdInput = (HANDLE) _get_osfhandle(fhin);
656 si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
657 si.hStdError = (HANDLE) _get_osfhandle(fherr);
658
659 /* concatenate argv, quoting args as we go */
660 strbuf_init(&args, 0);
661 if (prepend_cmd) {
662 char *quoted = (char *)quote_arg(cmd);
663 strbuf_addstr(&args, quoted);
664 if (quoted != cmd)
665 free(quoted);
666 }
667 for (; *argv; argv++) {
668 char *quoted = (char *)quote_arg(*argv);
669 if (*args.buf)
670 strbuf_addch(&args, ' ');
671 strbuf_addstr(&args, quoted);
672 if (quoted != *argv)
673 free(quoted);
674 }
675
676 if (env) {
677 int count = 0;
678 char **e, **sorted_env;
679
680 for (e = env; *e; e++)
681 count++;
682
683 /* environment must be sorted */
684 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
685 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
686 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
687
688 strbuf_init(&envblk, 0);
689 for (e = sorted_env; *e; e++) {
690 strbuf_addstr(&envblk, *e);
691 strbuf_addch(&envblk, '\0');
692 }
693 free(sorted_env);
694 }
695
696 memset(&pi, 0, sizeof(pi));
697 ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
698 env ? envblk.buf : NULL, NULL, &si, &pi);
699
700 if (env)
701 strbuf_release(&envblk);
702 strbuf_release(&args);
703
704 if (!ret) {
705 errno = ENOENT;
706 return -1;
707 }
708 CloseHandle(pi.hThread);
709 return (pid_t)pi.hProcess;
710 }
711
712 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
713 int prepend_cmd)
714 {
715 return mingw_spawnve_fd(cmd, argv, env, prepend_cmd, 0, 1, 2);
716 }
717
718 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
719 int fhin, int fhout, int fherr)
720 {
721 pid_t pid;
722 char **path = get_path_split();
723 char *prog = path_lookup(cmd, path, 0);
724
725 if (!prog) {
726 errno = ENOENT;
727 pid = -1;
728 }
729 else {
730 const char *interpr = parse_interpreter(prog);
731
732 if (interpr) {
733 const char *argv0 = argv[0];
734 char *iprog = path_lookup(interpr, path, 1);
735 argv[0] = prog;
736 if (!iprog) {
737 errno = ENOENT;
738 pid = -1;
739 }
740 else {
741 pid = mingw_spawnve_fd(iprog, argv, env, 1,
742 fhin, fhout, fherr);
743 free(iprog);
744 }
745 argv[0] = argv0;
746 }
747 else
748 pid = mingw_spawnve_fd(prog, argv, env, 0,
749 fhin, fhout, fherr);
750 free(prog);
751 }
752 free_path_split(path);
753 return pid;
754 }
755
756 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
757 {
758 const char *interpr = parse_interpreter(cmd);
759 char **path;
760 char *prog;
761 int pid = 0;
762
763 if (!interpr)
764 return 0;
765 path = get_path_split();
766 prog = path_lookup(interpr, path, 1);
767 if (prog) {
768 int argc = 0;
769 const char **argv2;
770 while (argv[argc]) argc++;
771 argv2 = xmalloc(sizeof(*argv) * (argc+1));
772 argv2[0] = (char *)cmd; /* full path to the script file */
773 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
774 pid = mingw_spawnve(prog, argv2, env, 1);
775 if (pid >= 0) {
776 int status;
777 if (waitpid(pid, &status, 0) < 0)
778 status = 255;
779 exit(status);
780 }
781 pid = 1; /* indicate that we tried but failed */
782 free(prog);
783 free(argv2);
784 }
785 free_path_split(path);
786 return pid;
787 }
788
789 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
790 {
791 /* check if git_command is a shell script */
792 if (!try_shell_exec(cmd, argv, (char **)env)) {
793 int pid, status;
794
795 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
796 if (pid < 0)
797 return;
798 if (waitpid(pid, &status, 0) < 0)
799 status = 255;
800 exit(status);
801 }
802 }
803
804 void mingw_execvp(const char *cmd, char *const *argv)
805 {
806 char **path = get_path_split();
807 char *prog = path_lookup(cmd, path, 0);
808
809 if (prog) {
810 mingw_execve(prog, argv, environ);
811 free(prog);
812 } else
813 errno = ENOENT;
814
815 free_path_split(path);
816 }
817
818 static char **copy_environ(void)
819 {
820 char **env;
821 int i = 0;
822 while (environ[i])
823 i++;
824 env = xmalloc((i+1)*sizeof(*env));
825 for (i = 0; environ[i]; i++)
826 env[i] = xstrdup(environ[i]);
827 env[i] = NULL;
828 return env;
829 }
830
831 void free_environ(char **env)
832 {
833 int i;
834 for (i = 0; env[i]; i++)
835 free(env[i]);
836 free(env);
837 }
838
839 static int lookup_env(char **env, const char *name, size_t nmln)
840 {
841 int i;
842
843 for (i = 0; env[i]; i++) {
844 if (0 == strncmp(env[i], name, nmln)
845 && '=' == env[i][nmln])
846 /* matches */
847 return i;
848 }
849 return -1;
850 }
851
852 /*
853 * If name contains '=', then sets the variable, otherwise it unsets it
854 */
855 static char **env_setenv(char **env, const char *name)
856 {
857 char *eq = strchrnul(name, '=');
858 int i = lookup_env(env, name, eq-name);
859
860 if (i < 0) {
861 if (*eq) {
862 for (i = 0; env[i]; i++)
863 ;
864 env = xrealloc(env, (i+2)*sizeof(*env));
865 env[i] = xstrdup(name);
866 env[i+1] = NULL;
867 }
868 }
869 else {
870 free(env[i]);
871 if (*eq)
872 env[i] = xstrdup(name);
873 else
874 for (; env[i]; i++)
875 env[i] = env[i+1];
876 }
877 return env;
878 }
879
880 /*
881 * Copies global environ and adjusts variables as specified by vars.
882 */
883 char **make_augmented_environ(const char *const *vars)
884 {
885 char **env = copy_environ();
886
887 while (*vars)
888 env = env_setenv(env, *vars++);
889 return env;
890 }
891
892 /*
893 * Note, this isn't a complete replacement for getaddrinfo. It assumes
894 * that service contains a numerical port, or that it it is null. It
895 * does a simple search using gethostbyname, and returns one IPv4 host
896 * if one was found.
897 */
898 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
899 const struct addrinfo *hints,
900 struct addrinfo **res)
901 {
902 struct hostent *h = gethostbyname(node);
903 struct addrinfo *ai;
904 struct sockaddr_in *sin;
905
906 if (!h)
907 return WSAGetLastError();
908
909 ai = xmalloc(sizeof(struct addrinfo));
910 *res = ai;
911 ai->ai_flags = 0;
912 ai->ai_family = AF_INET;
913 ai->ai_socktype = hints->ai_socktype;
914 switch (hints->ai_socktype) {
915 case SOCK_STREAM:
916 ai->ai_protocol = IPPROTO_TCP;
917 break;
918 case SOCK_DGRAM:
919 ai->ai_protocol = IPPROTO_UDP;
920 break;
921 default:
922 ai->ai_protocol = 0;
923 break;
924 }
925 ai->ai_addrlen = sizeof(struct sockaddr_in);
926 ai->ai_canonname = strdup(h->h_name);
927
928 sin = xmalloc(ai->ai_addrlen);
929 memset(sin, 0, ai->ai_addrlen);
930 sin->sin_family = AF_INET;
931 if (service)
932 sin->sin_port = htons(atoi(service));
933 sin->sin_addr = *(struct in_addr *)h->h_addr;
934 ai->ai_addr = (struct sockaddr *)sin;
935 ai->ai_next = 0;
936 return 0;
937 }
938
939 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
940 {
941 free(res->ai_canonname);
942 free(res->ai_addr);
943 free(res);
944 }
945
946 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
947 char *host, DWORD hostlen,
948 char *serv, DWORD servlen, int flags)
949 {
950 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
951 if (sa->sa_family != AF_INET)
952 return EAI_FAMILY;
953 if (!host && !serv)
954 return EAI_NONAME;
955
956 if (host && hostlen > 0) {
957 struct hostent *ent = NULL;
958 if (!(flags & NI_NUMERICHOST))
959 ent = gethostbyaddr((const char *)&sin->sin_addr,
960 sizeof(sin->sin_addr), AF_INET);
961
962 if (ent)
963 snprintf(host, hostlen, "%s", ent->h_name);
964 else if (flags & NI_NAMEREQD)
965 return EAI_NONAME;
966 else
967 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
968 }
969
970 if (serv && servlen > 0) {
971 struct servent *ent = NULL;
972 if (!(flags & NI_NUMERICSERV))
973 ent = getservbyport(sin->sin_port,
974 flags & NI_DGRAM ? "udp" : "tcp");
975
976 if (ent)
977 snprintf(serv, servlen, "%s", ent->s_name);
978 else
979 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
980 }
981
982 return 0;
983 }
984
985 static HMODULE ipv6_dll = NULL;
986 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
987 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
988 const struct addrinfo *hints,
989 struct addrinfo **res);
990 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
991 char *host, DWORD hostlen,
992 char *serv, DWORD servlen, int flags);
993 /*
994 * gai_strerror is an inline function in the ws2tcpip.h header, so we
995 * don't need to try to load that one dynamically.
996 */
997
998 static void socket_cleanup(void)
999 {
1000 WSACleanup();
1001 if (ipv6_dll)
1002 FreeLibrary(ipv6_dll);
1003 ipv6_dll = NULL;
1004 ipv6_freeaddrinfo = freeaddrinfo_stub;
1005 ipv6_getaddrinfo = getaddrinfo_stub;
1006 ipv6_getnameinfo = getnameinfo_stub;
1007 }
1008
1009 static void ensure_socket_initialization(void)
1010 {
1011 WSADATA wsa;
1012 static int initialized = 0;
1013 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1014 const char **name;
1015
1016 if (initialized)
1017 return;
1018
1019 if (WSAStartup(MAKEWORD(2,2), &wsa))
1020 die("unable to initialize winsock subsystem, error %d",
1021 WSAGetLastError());
1022
1023 for (name = libraries; *name; name++) {
1024 ipv6_dll = LoadLibrary(*name);
1025 if (!ipv6_dll)
1026 continue;
1027
1028 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1029 GetProcAddress(ipv6_dll, "freeaddrinfo");
1030 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1031 const struct addrinfo *,
1032 struct addrinfo **))
1033 GetProcAddress(ipv6_dll, "getaddrinfo");
1034 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1035 socklen_t, char *, DWORD,
1036 char *, DWORD, int))
1037 GetProcAddress(ipv6_dll, "getnameinfo");
1038 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1039 FreeLibrary(ipv6_dll);
1040 ipv6_dll = NULL;
1041 } else
1042 break;
1043 }
1044 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1045 ipv6_freeaddrinfo = freeaddrinfo_stub;
1046 ipv6_getaddrinfo = getaddrinfo_stub;
1047 ipv6_getnameinfo = getnameinfo_stub;
1048 }
1049
1050 atexit(socket_cleanup);
1051 initialized = 1;
1052 }
1053
1054 #undef gethostbyname
1055 struct hostent *mingw_gethostbyname(const char *host)
1056 {
1057 ensure_socket_initialization();
1058 return gethostbyname(host);
1059 }
1060
1061 void mingw_freeaddrinfo(struct addrinfo *res)
1062 {
1063 ipv6_freeaddrinfo(res);
1064 }
1065
1066 int mingw_getaddrinfo(const char *node, const char *service,
1067 const struct addrinfo *hints, struct addrinfo **res)
1068 {
1069 ensure_socket_initialization();
1070 return ipv6_getaddrinfo(node, service, hints, res);
1071 }
1072
1073 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1074 char *host, DWORD hostlen, char *serv, DWORD servlen,
1075 int flags)
1076 {
1077 ensure_socket_initialization();
1078 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1079 }
1080
1081 int mingw_socket(int domain, int type, int protocol)
1082 {
1083 int sockfd;
1084 SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1085 if (s == INVALID_SOCKET) {
1086 /*
1087 * WSAGetLastError() values are regular BSD error codes
1088 * biased by WSABASEERR.
1089 * However, strerror() does not know about networking
1090 * specific errors, which are values beginning at 38 or so.
1091 * Therefore, we choose to leave the biased error code
1092 * in errno so that _if_ someone looks up the code somewhere,
1093 * then it is at least the number that are usually listed.
1094 */
1095 errno = WSAGetLastError();
1096 return -1;
1097 }
1098 /* convert into a file descriptor */
1099 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1100 closesocket(s);
1101 return error("unable to make a socket file descriptor: %s",
1102 strerror(errno));
1103 }
1104 return sockfd;
1105 }
1106
1107 #undef connect
1108 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1109 {
1110 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1111 return connect(s, sa, sz);
1112 }
1113
1114 #undef rename
1115 int mingw_rename(const char *pold, const char *pnew)
1116 {
1117 DWORD attrs, gle;
1118 int tries = 0;
1119 static const int delay[] = { 0, 1, 10, 20, 40 };
1120
1121 /*
1122 * Try native rename() first to get errno right.
1123 * It is based on MoveFile(), which cannot overwrite existing files.
1124 */
1125 if (!rename(pold, pnew))
1126 return 0;
1127 if (errno != EEXIST)
1128 return -1;
1129 repeat:
1130 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1131 return 0;
1132 /* TODO: translate more errors */
1133 gle = GetLastError();
1134 if (gle == ERROR_ACCESS_DENIED &&
1135 (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1136 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1137 errno = EISDIR;
1138 return -1;
1139 }
1140 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1141 SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1142 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1143 return 0;
1144 gle = GetLastError();
1145 /* revert file attributes on failure */
1146 SetFileAttributes(pnew, attrs);
1147 }
1148 }
1149 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1150 /*
1151 * We assume that some other process had the source or
1152 * destination file open at the wrong moment and retry.
1153 * In order to give the other process a higher chance to
1154 * complete its operation, we give up our time slice now.
1155 * If we have to retry again, we do sleep a bit.
1156 */
1157 Sleep(delay[tries]);
1158 tries++;
1159 goto repeat;
1160 }
1161 errno = EACCES;
1162 return -1;
1163 }
1164
1165 /*
1166 * Note that this doesn't return the actual pagesize, but
1167 * the allocation granularity. If future Windows specific git code
1168 * needs the real getpagesize function, we need to find another solution.
1169 */
1170 int mingw_getpagesize(void)
1171 {
1172 SYSTEM_INFO si;
1173 GetSystemInfo(&si);
1174 return si.dwAllocationGranularity;
1175 }
1176
1177 struct passwd *getpwuid(int uid)
1178 {
1179 static char user_name[100];
1180 static struct passwd p;
1181
1182 DWORD len = sizeof(user_name);
1183 if (!GetUserName(user_name, &len))
1184 return NULL;
1185 p.pw_name = user_name;
1186 p.pw_gecos = "unknown";
1187 p.pw_dir = NULL;
1188 return &p;
1189 }
1190
1191 static HANDLE timer_event;
1192 static HANDLE timer_thread;
1193 static int timer_interval;
1194 static int one_shot;
1195 static sig_handler_t timer_fn = SIG_DFL;
1196
1197 /* The timer works like this:
1198 * The thread, ticktack(), is a trivial routine that most of the time
1199 * only waits to receive the signal to terminate. The main thread tells
1200 * the thread to terminate by setting the timer_event to the signalled
1201 * state.
1202 * But ticktack() interrupts the wait state after the timer's interval
1203 * length to call the signal handler.
1204 */
1205
1206 static unsigned __stdcall ticktack(void *dummy)
1207 {
1208 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1209 if (timer_fn == SIG_DFL)
1210 die("Alarm");
1211 if (timer_fn != SIG_IGN)
1212 timer_fn(SIGALRM);
1213 if (one_shot)
1214 break;
1215 }
1216 return 0;
1217 }
1218
1219 static int start_timer_thread(void)
1220 {
1221 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1222 if (timer_event) {
1223 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1224 if (!timer_thread )
1225 return errno = ENOMEM,
1226 error("cannot start timer thread");
1227 } else
1228 return errno = ENOMEM,
1229 error("cannot allocate resources for timer");
1230 return 0;
1231 }
1232
1233 static void stop_timer_thread(void)
1234 {
1235 if (timer_event)
1236 SetEvent(timer_event); /* tell thread to terminate */
1237 if (timer_thread) {
1238 int rc = WaitForSingleObject(timer_thread, 1000);
1239 if (rc == WAIT_TIMEOUT)
1240 error("timer thread did not terminate timely");
1241 else if (rc != WAIT_OBJECT_0)
1242 error("waiting for timer thread failed: %lu",
1243 GetLastError());
1244 CloseHandle(timer_thread);
1245 }
1246 if (timer_event)
1247 CloseHandle(timer_event);
1248 timer_event = NULL;
1249 timer_thread = NULL;
1250 }
1251
1252 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1253 {
1254 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1255 }
1256
1257 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1258 {
1259 static const struct timeval zero;
1260 static int atexit_done;
1261
1262 if (out != NULL)
1263 return errno = EINVAL,
1264 error("setitimer param 3 != NULL not implemented");
1265 if (!is_timeval_eq(&in->it_interval, &zero) &&
1266 !is_timeval_eq(&in->it_interval, &in->it_value))
1267 return errno = EINVAL,
1268 error("setitimer: it_interval must be zero or eq it_value");
1269
1270 if (timer_thread)
1271 stop_timer_thread();
1272
1273 if (is_timeval_eq(&in->it_value, &zero) &&
1274 is_timeval_eq(&in->it_interval, &zero))
1275 return 0;
1276
1277 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1278 one_shot = is_timeval_eq(&in->it_interval, &zero);
1279 if (!atexit_done) {
1280 atexit(stop_timer_thread);
1281 atexit_done = 1;
1282 }
1283 return start_timer_thread();
1284 }
1285
1286 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1287 {
1288 if (sig != SIGALRM)
1289 return errno = EINVAL,
1290 error("sigaction only implemented for SIGALRM");
1291 if (out != NULL)
1292 return errno = EINVAL,
1293 error("sigaction: param 3 != NULL not implemented");
1294
1295 timer_fn = in->sa_handler;
1296 return 0;
1297 }
1298
1299 #undef signal
1300 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1301 {
1302 sig_handler_t old = timer_fn;
1303 if (sig != SIGALRM)
1304 return signal(sig, handler);
1305 timer_fn = handler;
1306 return old;
1307 }
1308
1309 static const char *make_backslash_path(const char *path)
1310 {
1311 static char buf[PATH_MAX + 1];
1312 char *c;
1313
1314 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1315 die("Too long path: %.*s", 60, path);
1316
1317 for (c = buf; *c; c++) {
1318 if (*c == '/')
1319 *c = '\\';
1320 }
1321 return buf;
1322 }
1323
1324 void mingw_open_html(const char *unixpath)
1325 {
1326 const char *htmlpath = make_backslash_path(unixpath);
1327 typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1328 const char *, const char *, const char *, INT);
1329 T ShellExecute;
1330 HMODULE shell32;
1331
1332 shell32 = LoadLibrary("shell32.dll");
1333 if (!shell32)
1334 die("cannot load shell32.dll");
1335 ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1336 if (!ShellExecute)
1337 die("cannot run browser");
1338
1339 printf("Launching default browser to display HTML ...\n");
1340 ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1341
1342 FreeLibrary(shell32);
1343 }
1344
1345 int link(const char *oldpath, const char *newpath)
1346 {
1347 typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1348 static T create_hard_link = NULL;
1349 if (!create_hard_link) {
1350 create_hard_link = (T) GetProcAddress(
1351 GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1352 if (!create_hard_link)
1353 create_hard_link = (T)-1;
1354 }
1355 if (create_hard_link == (T)-1) {
1356 errno = ENOSYS;
1357 return -1;
1358 }
1359 if (!create_hard_link(newpath, oldpath, NULL)) {
1360 errno = err_win_to_posix(GetLastError());
1361 return -1;
1362 }
1363 return 0;
1364 }
1365
1366 char *getpass(const char *prompt)
1367 {
1368 struct strbuf buf = STRBUF_INIT;
1369
1370 fputs(prompt, stderr);
1371 for (;;) {
1372 char c = _getch();
1373 if (c == '\r' || c == '\n')
1374 break;
1375 strbuf_addch(&buf, c);
1376 }
1377 fputs("\n", stderr);
1378 return strbuf_detach(&buf, NULL);
1379 }
1380
1381 #ifndef NO_MINGW_REPLACE_READDIR
1382 /* MinGW readdir implementation to avoid extra lstats for Git */
1383 struct mingw_DIR
1384 {
1385 struct _finddata_t dd_dta; /* disk transfer area for this dir */
1386 struct mingw_dirent dd_dir; /* Our own implementation, including d_type */
1387 long dd_handle; /* _findnext handle */
1388 int dd_stat; /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1389 char dd_name[1]; /* given path for dir with search pattern (struct is extended) */
1390 };
1391
1392 struct dirent *mingw_readdir(DIR *dir)
1393 {
1394 WIN32_FIND_DATAA buf;
1395 HANDLE handle;
1396 struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1397
1398 if (!dir->dd_handle) {
1399 errno = EBADF; /* No set_errno for mingw */
1400 return NULL;
1401 }
1402
1403 if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1404 {
1405 DWORD lasterr;
1406 handle = FindFirstFileA(dir->dd_name, &buf);
1407 lasterr = GetLastError();
1408 dir->dd_handle = (long)handle;
1409 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1410 errno = err_win_to_posix(lasterr);
1411 return NULL;
1412 }
1413 } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1414 return NULL;
1415 } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1416 DWORD lasterr = GetLastError();
1417 FindClose((HANDLE)dir->dd_handle);
1418 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1419 /* POSIX says you shouldn't set errno when readdir can't
1420 find any more files; so, if another error we leave it set. */
1421 if (lasterr != ERROR_NO_MORE_FILES)
1422 errno = err_win_to_posix(lasterr);
1423 return NULL;
1424 }
1425
1426 /* We get here if `buf' contains valid data. */
1427 strcpy(dir->dd_dir.d_name, buf.cFileName);
1428 ++dir->dd_stat;
1429
1430 /* Set file type, based on WIN32_FIND_DATA */
1431 mdir->dd_dir.d_type = 0;
1432 if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1433 mdir->dd_dir.d_type |= DT_DIR;
1434 else
1435 mdir->dd_dir.d_type |= DT_REG;
1436
1437 return (struct dirent*)&dir->dd_dir;
1438 }
1439 #endif // !NO_MINGW_REPLACE_READDIR