Windows: simplify the pipe(2) implementation
[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(const char *cmd, const char **argv, char **env,
619 int prepend_cmd)
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(0);
656 si.hStdOutput = (HANDLE) _get_osfhandle(1);
657 si.hStdError = (HANDLE) _get_osfhandle(2);
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 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
713 {
714 pid_t pid;
715 char **path = get_path_split();
716 char *prog = path_lookup(cmd, path, 0);
717
718 if (!prog) {
719 errno = ENOENT;
720 pid = -1;
721 }
722 else {
723 const char *interpr = parse_interpreter(prog);
724
725 if (interpr) {
726 const char *argv0 = argv[0];
727 char *iprog = path_lookup(interpr, path, 1);
728 argv[0] = prog;
729 if (!iprog) {
730 errno = ENOENT;
731 pid = -1;
732 }
733 else {
734 pid = mingw_spawnve(iprog, argv, env, 1);
735 free(iprog);
736 }
737 argv[0] = argv0;
738 }
739 else
740 pid = mingw_spawnve(prog, argv, env, 0);
741 free(prog);
742 }
743 free_path_split(path);
744 return pid;
745 }
746
747 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
748 {
749 const char *interpr = parse_interpreter(cmd);
750 char **path;
751 char *prog;
752 int pid = 0;
753
754 if (!interpr)
755 return 0;
756 path = get_path_split();
757 prog = path_lookup(interpr, path, 1);
758 if (prog) {
759 int argc = 0;
760 const char **argv2;
761 while (argv[argc]) argc++;
762 argv2 = xmalloc(sizeof(*argv) * (argc+1));
763 argv2[0] = (char *)cmd; /* full path to the script file */
764 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
765 pid = mingw_spawnve(prog, argv2, env, 1);
766 if (pid >= 0) {
767 int status;
768 if (waitpid(pid, &status, 0) < 0)
769 status = 255;
770 exit(status);
771 }
772 pid = 1; /* indicate that we tried but failed */
773 free(prog);
774 free(argv2);
775 }
776 free_path_split(path);
777 return pid;
778 }
779
780 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
781 {
782 /* check if git_command is a shell script */
783 if (!try_shell_exec(cmd, argv, (char **)env)) {
784 int pid, status;
785
786 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
787 if (pid < 0)
788 return;
789 if (waitpid(pid, &status, 0) < 0)
790 status = 255;
791 exit(status);
792 }
793 }
794
795 void mingw_execvp(const char *cmd, char *const *argv)
796 {
797 char **path = get_path_split();
798 char *prog = path_lookup(cmd, path, 0);
799
800 if (prog) {
801 mingw_execve(prog, argv, environ);
802 free(prog);
803 } else
804 errno = ENOENT;
805
806 free_path_split(path);
807 }
808
809 static char **copy_environ(void)
810 {
811 char **env;
812 int i = 0;
813 while (environ[i])
814 i++;
815 env = xmalloc((i+1)*sizeof(*env));
816 for (i = 0; environ[i]; i++)
817 env[i] = xstrdup(environ[i]);
818 env[i] = NULL;
819 return env;
820 }
821
822 void free_environ(char **env)
823 {
824 int i;
825 for (i = 0; env[i]; i++)
826 free(env[i]);
827 free(env);
828 }
829
830 static int lookup_env(char **env, const char *name, size_t nmln)
831 {
832 int i;
833
834 for (i = 0; env[i]; i++) {
835 if (0 == strncmp(env[i], name, nmln)
836 && '=' == env[i][nmln])
837 /* matches */
838 return i;
839 }
840 return -1;
841 }
842
843 /*
844 * If name contains '=', then sets the variable, otherwise it unsets it
845 */
846 static char **env_setenv(char **env, const char *name)
847 {
848 char *eq = strchrnul(name, '=');
849 int i = lookup_env(env, name, eq-name);
850
851 if (i < 0) {
852 if (*eq) {
853 for (i = 0; env[i]; i++)
854 ;
855 env = xrealloc(env, (i+2)*sizeof(*env));
856 env[i] = xstrdup(name);
857 env[i+1] = NULL;
858 }
859 }
860 else {
861 free(env[i]);
862 if (*eq)
863 env[i] = xstrdup(name);
864 else
865 for (; env[i]; i++)
866 env[i] = env[i+1];
867 }
868 return env;
869 }
870
871 /*
872 * Copies global environ and adjusts variables as specified by vars.
873 */
874 char **make_augmented_environ(const char *const *vars)
875 {
876 char **env = copy_environ();
877
878 while (*vars)
879 env = env_setenv(env, *vars++);
880 return env;
881 }
882
883 /*
884 * Note, this isn't a complete replacement for getaddrinfo. It assumes
885 * that service contains a numerical port, or that it it is null. It
886 * does a simple search using gethostbyname, and returns one IPv4 host
887 * if one was found.
888 */
889 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
890 const struct addrinfo *hints,
891 struct addrinfo **res)
892 {
893 struct hostent *h = gethostbyname(node);
894 struct addrinfo *ai;
895 struct sockaddr_in *sin;
896
897 if (!h)
898 return WSAGetLastError();
899
900 ai = xmalloc(sizeof(struct addrinfo));
901 *res = ai;
902 ai->ai_flags = 0;
903 ai->ai_family = AF_INET;
904 ai->ai_socktype = hints->ai_socktype;
905 switch (hints->ai_socktype) {
906 case SOCK_STREAM:
907 ai->ai_protocol = IPPROTO_TCP;
908 break;
909 case SOCK_DGRAM:
910 ai->ai_protocol = IPPROTO_UDP;
911 break;
912 default:
913 ai->ai_protocol = 0;
914 break;
915 }
916 ai->ai_addrlen = sizeof(struct sockaddr_in);
917 ai->ai_canonname = strdup(h->h_name);
918
919 sin = xmalloc(ai->ai_addrlen);
920 memset(sin, 0, ai->ai_addrlen);
921 sin->sin_family = AF_INET;
922 if (service)
923 sin->sin_port = htons(atoi(service));
924 sin->sin_addr = *(struct in_addr *)h->h_addr;
925 ai->ai_addr = (struct sockaddr *)sin;
926 ai->ai_next = 0;
927 return 0;
928 }
929
930 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
931 {
932 free(res->ai_canonname);
933 free(res->ai_addr);
934 free(res);
935 }
936
937 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
938 char *host, DWORD hostlen,
939 char *serv, DWORD servlen, int flags)
940 {
941 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
942 if (sa->sa_family != AF_INET)
943 return EAI_FAMILY;
944 if (!host && !serv)
945 return EAI_NONAME;
946
947 if (host && hostlen > 0) {
948 struct hostent *ent = NULL;
949 if (!(flags & NI_NUMERICHOST))
950 ent = gethostbyaddr((const char *)&sin->sin_addr,
951 sizeof(sin->sin_addr), AF_INET);
952
953 if (ent)
954 snprintf(host, hostlen, "%s", ent->h_name);
955 else if (flags & NI_NAMEREQD)
956 return EAI_NONAME;
957 else
958 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
959 }
960
961 if (serv && servlen > 0) {
962 struct servent *ent = NULL;
963 if (!(flags & NI_NUMERICSERV))
964 ent = getservbyport(sin->sin_port,
965 flags & NI_DGRAM ? "udp" : "tcp");
966
967 if (ent)
968 snprintf(serv, servlen, "%s", ent->s_name);
969 else
970 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
971 }
972
973 return 0;
974 }
975
976 static HMODULE ipv6_dll = NULL;
977 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
978 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
979 const struct addrinfo *hints,
980 struct addrinfo **res);
981 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
982 char *host, DWORD hostlen,
983 char *serv, DWORD servlen, int flags);
984 /*
985 * gai_strerror is an inline function in the ws2tcpip.h header, so we
986 * don't need to try to load that one dynamically.
987 */
988
989 static void socket_cleanup(void)
990 {
991 WSACleanup();
992 if (ipv6_dll)
993 FreeLibrary(ipv6_dll);
994 ipv6_dll = NULL;
995 ipv6_freeaddrinfo = freeaddrinfo_stub;
996 ipv6_getaddrinfo = getaddrinfo_stub;
997 ipv6_getnameinfo = getnameinfo_stub;
998 }
999
1000 static void ensure_socket_initialization(void)
1001 {
1002 WSADATA wsa;
1003 static int initialized = 0;
1004 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1005 const char **name;
1006
1007 if (initialized)
1008 return;
1009
1010 if (WSAStartup(MAKEWORD(2,2), &wsa))
1011 die("unable to initialize winsock subsystem, error %d",
1012 WSAGetLastError());
1013
1014 for (name = libraries; *name; name++) {
1015 ipv6_dll = LoadLibrary(*name);
1016 if (!ipv6_dll)
1017 continue;
1018
1019 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1020 GetProcAddress(ipv6_dll, "freeaddrinfo");
1021 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1022 const struct addrinfo *,
1023 struct addrinfo **))
1024 GetProcAddress(ipv6_dll, "getaddrinfo");
1025 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1026 socklen_t, char *, DWORD,
1027 char *, DWORD, int))
1028 GetProcAddress(ipv6_dll, "getnameinfo");
1029 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1030 FreeLibrary(ipv6_dll);
1031 ipv6_dll = NULL;
1032 } else
1033 break;
1034 }
1035 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1036 ipv6_freeaddrinfo = freeaddrinfo_stub;
1037 ipv6_getaddrinfo = getaddrinfo_stub;
1038 ipv6_getnameinfo = getnameinfo_stub;
1039 }
1040
1041 atexit(socket_cleanup);
1042 initialized = 1;
1043 }
1044
1045 #undef gethostbyname
1046 struct hostent *mingw_gethostbyname(const char *host)
1047 {
1048 ensure_socket_initialization();
1049 return gethostbyname(host);
1050 }
1051
1052 void mingw_freeaddrinfo(struct addrinfo *res)
1053 {
1054 ipv6_freeaddrinfo(res);
1055 }
1056
1057 int mingw_getaddrinfo(const char *node, const char *service,
1058 const struct addrinfo *hints, struct addrinfo **res)
1059 {
1060 ensure_socket_initialization();
1061 return ipv6_getaddrinfo(node, service, hints, res);
1062 }
1063
1064 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1065 char *host, DWORD hostlen, char *serv, DWORD servlen,
1066 int flags)
1067 {
1068 ensure_socket_initialization();
1069 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1070 }
1071
1072 int mingw_socket(int domain, int type, int protocol)
1073 {
1074 int sockfd;
1075 SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1076 if (s == INVALID_SOCKET) {
1077 /*
1078 * WSAGetLastError() values are regular BSD error codes
1079 * biased by WSABASEERR.
1080 * However, strerror() does not know about networking
1081 * specific errors, which are values beginning at 38 or so.
1082 * Therefore, we choose to leave the biased error code
1083 * in errno so that _if_ someone looks up the code somewhere,
1084 * then it is at least the number that are usually listed.
1085 */
1086 errno = WSAGetLastError();
1087 return -1;
1088 }
1089 /* convert into a file descriptor */
1090 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1091 closesocket(s);
1092 return error("unable to make a socket file descriptor: %s",
1093 strerror(errno));
1094 }
1095 return sockfd;
1096 }
1097
1098 #undef connect
1099 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1100 {
1101 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1102 return connect(s, sa, sz);
1103 }
1104
1105 #undef rename
1106 int mingw_rename(const char *pold, const char *pnew)
1107 {
1108 DWORD attrs, gle;
1109 int tries = 0;
1110 static const int delay[] = { 0, 1, 10, 20, 40 };
1111
1112 /*
1113 * Try native rename() first to get errno right.
1114 * It is based on MoveFile(), which cannot overwrite existing files.
1115 */
1116 if (!rename(pold, pnew))
1117 return 0;
1118 if (errno != EEXIST)
1119 return -1;
1120 repeat:
1121 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1122 return 0;
1123 /* TODO: translate more errors */
1124 gle = GetLastError();
1125 if (gle == ERROR_ACCESS_DENIED &&
1126 (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1127 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1128 errno = EISDIR;
1129 return -1;
1130 }
1131 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1132 SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1133 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1134 return 0;
1135 gle = GetLastError();
1136 /* revert file attributes on failure */
1137 SetFileAttributes(pnew, attrs);
1138 }
1139 }
1140 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1141 /*
1142 * We assume that some other process had the source or
1143 * destination file open at the wrong moment and retry.
1144 * In order to give the other process a higher chance to
1145 * complete its operation, we give up our time slice now.
1146 * If we have to retry again, we do sleep a bit.
1147 */
1148 Sleep(delay[tries]);
1149 tries++;
1150 goto repeat;
1151 }
1152 errno = EACCES;
1153 return -1;
1154 }
1155
1156 /*
1157 * Note that this doesn't return the actual pagesize, but
1158 * the allocation granularity. If future Windows specific git code
1159 * needs the real getpagesize function, we need to find another solution.
1160 */
1161 int mingw_getpagesize(void)
1162 {
1163 SYSTEM_INFO si;
1164 GetSystemInfo(&si);
1165 return si.dwAllocationGranularity;
1166 }
1167
1168 struct passwd *getpwuid(int uid)
1169 {
1170 static char user_name[100];
1171 static struct passwd p;
1172
1173 DWORD len = sizeof(user_name);
1174 if (!GetUserName(user_name, &len))
1175 return NULL;
1176 p.pw_name = user_name;
1177 p.pw_gecos = "unknown";
1178 p.pw_dir = NULL;
1179 return &p;
1180 }
1181
1182 static HANDLE timer_event;
1183 static HANDLE timer_thread;
1184 static int timer_interval;
1185 static int one_shot;
1186 static sig_handler_t timer_fn = SIG_DFL;
1187
1188 /* The timer works like this:
1189 * The thread, ticktack(), is a trivial routine that most of the time
1190 * only waits to receive the signal to terminate. The main thread tells
1191 * the thread to terminate by setting the timer_event to the signalled
1192 * state.
1193 * But ticktack() interrupts the wait state after the timer's interval
1194 * length to call the signal handler.
1195 */
1196
1197 static unsigned __stdcall ticktack(void *dummy)
1198 {
1199 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1200 if (timer_fn == SIG_DFL)
1201 die("Alarm");
1202 if (timer_fn != SIG_IGN)
1203 timer_fn(SIGALRM);
1204 if (one_shot)
1205 break;
1206 }
1207 return 0;
1208 }
1209
1210 static int start_timer_thread(void)
1211 {
1212 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1213 if (timer_event) {
1214 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1215 if (!timer_thread )
1216 return errno = ENOMEM,
1217 error("cannot start timer thread");
1218 } else
1219 return errno = ENOMEM,
1220 error("cannot allocate resources for timer");
1221 return 0;
1222 }
1223
1224 static void stop_timer_thread(void)
1225 {
1226 if (timer_event)
1227 SetEvent(timer_event); /* tell thread to terminate */
1228 if (timer_thread) {
1229 int rc = WaitForSingleObject(timer_thread, 1000);
1230 if (rc == WAIT_TIMEOUT)
1231 error("timer thread did not terminate timely");
1232 else if (rc != WAIT_OBJECT_0)
1233 error("waiting for timer thread failed: %lu",
1234 GetLastError());
1235 CloseHandle(timer_thread);
1236 }
1237 if (timer_event)
1238 CloseHandle(timer_event);
1239 timer_event = NULL;
1240 timer_thread = NULL;
1241 }
1242
1243 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1244 {
1245 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1246 }
1247
1248 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1249 {
1250 static const struct timeval zero;
1251 static int atexit_done;
1252
1253 if (out != NULL)
1254 return errno = EINVAL,
1255 error("setitimer param 3 != NULL not implemented");
1256 if (!is_timeval_eq(&in->it_interval, &zero) &&
1257 !is_timeval_eq(&in->it_interval, &in->it_value))
1258 return errno = EINVAL,
1259 error("setitimer: it_interval must be zero or eq it_value");
1260
1261 if (timer_thread)
1262 stop_timer_thread();
1263
1264 if (is_timeval_eq(&in->it_value, &zero) &&
1265 is_timeval_eq(&in->it_interval, &zero))
1266 return 0;
1267
1268 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1269 one_shot = is_timeval_eq(&in->it_interval, &zero);
1270 if (!atexit_done) {
1271 atexit(stop_timer_thread);
1272 atexit_done = 1;
1273 }
1274 return start_timer_thread();
1275 }
1276
1277 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1278 {
1279 if (sig != SIGALRM)
1280 return errno = EINVAL,
1281 error("sigaction only implemented for SIGALRM");
1282 if (out != NULL)
1283 return errno = EINVAL,
1284 error("sigaction: param 3 != NULL not implemented");
1285
1286 timer_fn = in->sa_handler;
1287 return 0;
1288 }
1289
1290 #undef signal
1291 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1292 {
1293 sig_handler_t old = timer_fn;
1294 if (sig != SIGALRM)
1295 return signal(sig, handler);
1296 timer_fn = handler;
1297 return old;
1298 }
1299
1300 static const char *make_backslash_path(const char *path)
1301 {
1302 static char buf[PATH_MAX + 1];
1303 char *c;
1304
1305 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1306 die("Too long path: %.*s", 60, path);
1307
1308 for (c = buf; *c; c++) {
1309 if (*c == '/')
1310 *c = '\\';
1311 }
1312 return buf;
1313 }
1314
1315 void mingw_open_html(const char *unixpath)
1316 {
1317 const char *htmlpath = make_backslash_path(unixpath);
1318 typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1319 const char *, const char *, const char *, INT);
1320 T ShellExecute;
1321 HMODULE shell32;
1322
1323 shell32 = LoadLibrary("shell32.dll");
1324 if (!shell32)
1325 die("cannot load shell32.dll");
1326 ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1327 if (!ShellExecute)
1328 die("cannot run browser");
1329
1330 printf("Launching default browser to display HTML ...\n");
1331 ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1332
1333 FreeLibrary(shell32);
1334 }
1335
1336 int link(const char *oldpath, const char *newpath)
1337 {
1338 typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1339 static T create_hard_link = NULL;
1340 if (!create_hard_link) {
1341 create_hard_link = (T) GetProcAddress(
1342 GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1343 if (!create_hard_link)
1344 create_hard_link = (T)-1;
1345 }
1346 if (create_hard_link == (T)-1) {
1347 errno = ENOSYS;
1348 return -1;
1349 }
1350 if (!create_hard_link(newpath, oldpath, NULL)) {
1351 errno = err_win_to_posix(GetLastError());
1352 return -1;
1353 }
1354 return 0;
1355 }
1356
1357 char *getpass(const char *prompt)
1358 {
1359 struct strbuf buf = STRBUF_INIT;
1360
1361 fputs(prompt, stderr);
1362 for (;;) {
1363 char c = _getch();
1364 if (c == '\r' || c == '\n')
1365 break;
1366 strbuf_addch(&buf, c);
1367 }
1368 fputs("\n", stderr);
1369 return strbuf_detach(&buf, NULL);
1370 }
1371
1372 #ifndef NO_MINGW_REPLACE_READDIR
1373 /* MinGW readdir implementation to avoid extra lstats for Git */
1374 struct mingw_DIR
1375 {
1376 struct _finddata_t dd_dta; /* disk transfer area for this dir */
1377 struct mingw_dirent dd_dir; /* Our own implementation, including d_type */
1378 long dd_handle; /* _findnext handle */
1379 int dd_stat; /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1380 char dd_name[1]; /* given path for dir with search pattern (struct is extended) */
1381 };
1382
1383 struct dirent *mingw_readdir(DIR *dir)
1384 {
1385 WIN32_FIND_DATAA buf;
1386 HANDLE handle;
1387 struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1388
1389 if (!dir->dd_handle) {
1390 errno = EBADF; /* No set_errno for mingw */
1391 return NULL;
1392 }
1393
1394 if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1395 {
1396 DWORD lasterr;
1397 handle = FindFirstFileA(dir->dd_name, &buf);
1398 lasterr = GetLastError();
1399 dir->dd_handle = (long)handle;
1400 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1401 errno = err_win_to_posix(lasterr);
1402 return NULL;
1403 }
1404 } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1405 return NULL;
1406 } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1407 DWORD lasterr = GetLastError();
1408 FindClose((HANDLE)dir->dd_handle);
1409 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1410 /* POSIX says you shouldn't set errno when readdir can't
1411 find any more files; so, if another error we leave it set. */
1412 if (lasterr != ERROR_NO_MORE_FILES)
1413 errno = err_win_to_posix(lasterr);
1414 return NULL;
1415 }
1416
1417 /* We get here if `buf' contains valid data. */
1418 strcpy(dir->dd_dir.d_name, buf.cFileName);
1419 ++dir->dd_stat;
1420
1421 /* Set file type, based on WIN32_FIND_DATA */
1422 mdir->dd_dir.d_type = 0;
1423 if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1424 mdir->dd_dir.d_type |= DT_DIR;
1425 else
1426 mdir->dd_dir.d_type |= DT_REG;
1427
1428 return (struct dirent*)&dir->dd_dir;
1429 }
1430 #endif // !NO_MINGW_REPLACE_READDIR