compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <winioctl.h>
   5 #include "../strbuf.h"
   6
   7 #include <shellapi.h>
   8
   9 static int err_win_to_posix(DWORD winerr)
  10 {
  11         int error = ENOSYS;
  12         switch(winerr) {
  13         case ERROR_ACCESS_DENIED: error = EACCES; break;
  14         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  15         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  16         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  17         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  18         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  19         case ERROR_BAD_COMMAND: error = EIO; break;
  20         case ERROR_BAD_DEVICE: error = ENODEV; break;
  21         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  22         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  23         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  24         case ERROR_BAD_LENGTH: error = EINVAL; break;
  25         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  26         case ERROR_BAD_PIPE: error = EPIPE; break;
  27         case ERROR_BAD_UNIT: error = ENODEV; break;
  28         case ERROR_BAD_USERNAME: error = EINVAL; break;
  29         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  30         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  31         case ERROR_BUSY: error = EBUSY; break;
  32         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  33         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  34         case ERROR_CANNOT_MAKE: error = EACCES; break;
  35         case ERROR_CANTOPEN: error = EIO; break;
  36         case ERROR_CANTREAD: error = EIO; break;
  37         case ERROR_CANTWRITE: error = EIO; break;
  38         case ERROR_CRC: error = EIO; break;
  39         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  40         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  41         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  42         case ERROR_DIRECTORY: error = EINVAL; break;
  43         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  44         case ERROR_DISK_CHANGE: error = EIO; break;
  45         case ERROR_DISK_FULL: error = ENOSPC; break;
  46         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  47         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  48         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  49         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  50         case ERROR_FILE_EXISTS: error = EEXIST; break;
  51         case ERROR_FILE_INVALID: error = ENODEV; break;
  52         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  53         case ERROR_GEN_FAILURE: error = EIO; break;
  54         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  55         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  56         case ERROR_INVALID_ACCESS: error = EACCES; break;
  57         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  58         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  59         case ERROR_INVALID_DATA: error = EINVAL; break;
  60         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  61         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  62         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  63         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  64         case ERROR_INVALID_HANDLE: error = EBADF; break;
  65         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  66         case ERROR_INVALID_NAME: error = EINVAL; break;
  67         case ERROR_INVALID_OWNER: error = EINVAL; break;
  68         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  69         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  70         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  71         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  72         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  73         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  74         case ERROR_IO_DEVICE: error = EIO; break;
  75         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  76         case ERROR_LOCKED: error = EBUSY; break;
  77         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  78         case ERROR_LOGON_FAILURE: error = EACCES; break;
  79         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  80         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  81         case ERROR_MORE_DATA: error = EPIPE; break;
  82         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  83         case ERROR_NOACCESS: error = EFAULT; break;
  84         case ERROR_NONE_MAPPED: error = EINVAL; break;
  85         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  86         case ERROR_NOT_READY: error = EAGAIN; break;
  87         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  88         case ERROR_NO_DATA: error = EPIPE; break;
  89         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  90         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  91         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  92         case ERROR_OPEN_FAILED: error = EIO; break;
  93         case ERROR_OPEN_FILES: error = EBUSY; break;
  94         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  95         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  96         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  97         case ERROR_PATH_BUSY: error = EBUSY; break;
  98         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  99         case ERROR_PIPE_BUSY: error = EBUSY; break;
 100         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 101         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 102         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 103         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 104         case ERROR_READ_FAULT: error = EIO; break;
 105         case ERROR_SEEK: error = EIO; break;
 106         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 107         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 108         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 109         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 110         case ERROR_SWAPERROR: error = ENOENT; break;
 111         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 112         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 113         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 114         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 115         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 116         case ERROR_WRITE_FAULT: error = EIO; break;
 117         case ERROR_WRITE_PROTECT: error = EROFS; break;
 118         }
 119         return error;
 120 }
 121
 122 #undef open
 123 int mingw_open (const char *filename, int oflags, ...)
 124 {
 125         va_list args;
 126         unsigned mode;
 127         int fd;
 128
 129         va_start(args, oflags);
 130         mode = va_arg(args, int);
 131         va_end(args);
 132
 133         if (!strcmp(filename, "/dev/null"))
 134                 filename = "nul";
 135
 136         fd = open(filename, oflags, mode);
 137
 138         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 139                 DWORD attrs = GetFileAttributes(filename);
 140                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 141                         errno = EISDIR;
 142         }
 143         return fd;
 144 }
 145
 146 static inline time_t filetime_to_time_t(const FILETIME *ft)
 147 {
 148         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 149         winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
 150         winTime /= 10000000;             /* Nano to seconds resolution */
 151         return (time_t)winTime;
 152 }
 153
 154 /* We keep the do_lstat code in a separate function to avoid recursion.
 155  * When a path ends with a slash, the stat will fail with ENOENT. In
 156  * this case, we strip the trailing slashes and stat again.
 157  */
 158 static int do_lstat(const char *file_name, struct stat *buf)
 159 {
 160         WIN32_FILE_ATTRIBUTE_DATA fdata;
 161
 162         if (!(errno = get_file_attr(file_name, &fdata))) {
 163                 buf->st_ino = 0;
 164                 buf->st_gid = 0;
 165                 buf->st_uid = 0;
 166                 buf->st_nlink = 1;
 167                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 168                 buf->st_size = fdata.nFileSizeLow |
 169                         (((off_t)fdata.nFileSizeHigh)<<32);
 170                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 171                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 172                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 173                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 174                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 175                         WIN32_FIND_DATAA findbuf;
 176                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 177                         if (handle != INVALID_HANDLE_VALUE) {
 178                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 179                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 180                                         char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 181                                         buf->st_mode = S_IREAD | S_IFLNK;
 182                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 183                                                 buf->st_mode |= S_IWRITE;
 184                                         buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 185                                 }
 186                                 FindClose(handle);
 187                         }
 188                 }
 189                 return 0;
 190         }
 191         return -1;
 192 }
 193
 194 /* We provide our own lstat/fstat functions, since the provided
 195  * lstat/fstat functions are so slow. These stat functions are
 196  * tailored for Git's usage (read: fast), and are not meant to be
 197  * complete. Note that Git stat()s are redirected to mingw_lstat()
 198  * too, since Windows doesn't really handle symlinks that well.
 199  */
 200 int mingw_lstat(const char *file_name, struct stat *buf)
 201 {
 202         int namelen;
 203         static char alt_name[PATH_MAX];
 204
 205         if (!do_lstat(file_name, buf))
 206                 return 0;
 207
 208         /* if file_name ended in a '/', Windows returned ENOENT;
 209          * try again without trailing slashes
 210          */
 211         if (errno != ENOENT)
 212                 return -1;
 213
 214         namelen = strlen(file_name);
 215         if (namelen && file_name[namelen-1] != '/')
 216                 return -1;
 217         while (namelen && file_name[namelen-1] == '/')
 218                 --namelen;
 219         if (!namelen || namelen >= PATH_MAX)
 220                 return -1;
 221
 222         memcpy(alt_name, file_name, namelen);
 223         alt_name[namelen] = 0;
 224         return do_lstat(alt_name, buf);
 225 }
 226
 227 #undef fstat
 228 int mingw_fstat(int fd, struct stat *buf)
 229 {
 230         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 231         BY_HANDLE_FILE_INFORMATION fdata;
 232
 233         if (fh == INVALID_HANDLE_VALUE) {
 234                 errno = EBADF;
 235                 return -1;
 236         }
 237         /* direct non-file handles to MS's fstat() */
 238         if (GetFileType(fh) != FILE_TYPE_DISK)
 239                 return _fstati64(fd, buf);
 240
 241         if (GetFileInformationByHandle(fh, &fdata)) {
 242                 buf->st_ino = 0;
 243                 buf->st_gid = 0;
 244                 buf->st_uid = 0;
 245                 buf->st_nlink = 1;
 246                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 247                 buf->st_size = fdata.nFileSizeLow |
 248                         (((off_t)fdata.nFileSizeHigh)<<32);
 249                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 250                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 251                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 252                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 253                 return 0;
 254         }
 255         errno = EBADF;
 256         return -1;
 257 }
 258
 259 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 260 {
 261         long long winTime = t * 10000000LL + 116444736000000000LL;
 262         ft->dwLowDateTime = winTime;
 263         ft->dwHighDateTime = winTime >> 32;
 264 }
 265
 266 int mingw_utime (const char *file_name, const struct utimbuf *times)
 267 {
 268         FILETIME mft, aft;
 269         int fh, rc;
 270
 271         /* must have write permission */
 272         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 273                 return -1;
 274
 275         time_t_to_filetime(times->modtime, &mft);
 276         time_t_to_filetime(times->actime, &aft);
 277         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 278                 errno = EINVAL;
 279                 rc = -1;
 280         } else
 281                 rc = 0;
 282         close(fh);
 283         return rc;
 284 }
 285
 286 unsigned int sleep (unsigned int seconds)
 287 {
 288         Sleep(seconds*1000);
 289         return 0;
 290 }
 291
 292 int mkstemp(char *template)
 293 {
 294         char *filename = mktemp(template);
 295         if (filename == NULL)
 296                 return -1;
 297         return open(filename, O_RDWR | O_CREAT, 0600);
 298 }
 299
 300 int gettimeofday(struct timeval *tv, void *tz)
 301 {
 302         SYSTEMTIME st;
 303         struct tm tm;
 304         GetSystemTime(&st);
 305         tm.tm_year = st.wYear-1900;
 306         tm.tm_mon = st.wMonth-1;
 307         tm.tm_mday = st.wDay;
 308         tm.tm_hour = st.wHour;
 309         tm.tm_min = st.wMinute;
 310         tm.tm_sec = st.wSecond;
 311         tv->tv_sec = tm_to_time_t(&tm);
 312         if (tv->tv_sec < 0)
 313                 return -1;
 314         tv->tv_usec = st.wMilliseconds*1000;
 315         return 0;
 316 }
 317
 318 int pipe(int filedes[2])
 319 {
 320         int fd;
 321         HANDLE h[2], parent;
 322
 323         if (_pipe(filedes, 8192, 0) < 0)
 324                 return -1;
 325
 326         parent = GetCurrentProcess();
 327
 328         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 329                         parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 330                 close(filedes[0]);
 331                 close(filedes[1]);
 332                 return -1;
 333         }
 334         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 335                         parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 336                 close(filedes[0]);
 337                 close(filedes[1]);
 338                 CloseHandle(h[0]);
 339                 return -1;
 340         }
 341         fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 342         if (fd < 0) {
 343                 close(filedes[0]);
 344                 close(filedes[1]);
 345                 CloseHandle(h[0]);
 346                 CloseHandle(h[1]);
 347                 return -1;
 348         }
 349         close(filedes[0]);
 350         filedes[0] = fd;
 351         fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 352         if (fd < 0) {
 353                 close(filedes[0]);
 354                 close(filedes[1]);
 355                 CloseHandle(h[1]);
 356                 return -1;
 357         }
 358         close(filedes[1]);
 359         filedes[1] = fd;
 360         return 0;
 361 }
 362
 363 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 364 {
 365         int i, pending;
 366
 367         if (timeout >= 0) {
 368                 if (nfds == 0) {
 369                         Sleep(timeout);
 370                         return 0;
 371                 }
 372                 return errno = EINVAL, error("poll timeout not supported");
 373         }
 374
 375         /* When there is only one fd to wait for, then we pretend that
 376          * input is available and let the actual wait happen when the
 377          * caller invokes read().
 378          */
 379         if (nfds == 1) {
 380                 if (!(ufds[0].events & POLLIN))
 381                         return errno = EINVAL, error("POLLIN not set");
 382                 ufds[0].revents = POLLIN;
 383                 return 0;
 384         }
 385
 386 repeat:
 387         pending = 0;
 388         for (i = 0; i < nfds; i++) {
 389                 DWORD avail = 0;
 390                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 391                 if (h == INVALID_HANDLE_VALUE)
 392                         return -1;      /* errno was set */
 393
 394                 if (!(ufds[i].events & POLLIN))
 395                         return errno = EINVAL, error("POLLIN not set");
 396
 397                 /* this emulation works only for pipes */
 398                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 399                         int err = GetLastError();
 400                         if (err == ERROR_BROKEN_PIPE) {
 401                                 ufds[i].revents = POLLHUP;
 402                                 pending++;
 403                         } else {
 404                                 errno = EINVAL;
 405                                 return error("PeekNamedPipe failed,"
 406                                         " GetLastError: %u", err);
 407                         }
 408                 } else if (avail) {
 409                         ufds[i].revents = POLLIN;
 410                         pending++;
 411                 } else
 412                         ufds[i].revents = 0;
 413         }
 414         if (!pending) {
 415                 /* The only times that we spin here is when the process
 416                  * that is connected through the pipes is waiting for
 417                  * its own input data to become available. But since
 418                  * the process (pack-objects) is itself CPU intensive,
 419                  * it will happily pick up the time slice that we are
 420                  * relinquishing here.
 421                  */
 422                 Sleep(0);
 423                 goto repeat;
 424         }
 425         return 0;
 426 }
 427
 428 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 429 {
 430         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 431         memcpy(result, gmtime(timep), sizeof(struct tm));
 432         return result;
 433 }
 434
 435 struct tm *localtime_r(const time_t *timep, struct tm *result)
 436 {
 437         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 438         memcpy(result, localtime(timep), sizeof(struct tm));
 439         return result;
 440 }
 441
 442 #undef getcwd
 443 char *mingw_getcwd(char *pointer, int len)
 444 {
 445         int i;
 446         char *ret = getcwd(pointer, len);
 447         if (!ret)
 448                 return ret;
 449         for (i = 0; pointer[i]; i++)
 450                 if (pointer[i] == '\\')
 451                         pointer[i] = '/';
 452         return ret;
 453 }
 454
 455 #undef getenv
 456 char *mingw_getenv(const char *name)
 457 {
 458         char *result = getenv(name);
 459         if (!result && !strcmp(name, "TMPDIR")) {
 460                 /* on Windows it is TMP and TEMP */
 461                 result = getenv("TMP");
 462                 if (!result)
 463                         result = getenv("TEMP");
 464         }
 465         return result;
 466 }
 467
 468 /*
 469  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 470  * (Parsing C++ Command-Line Arguments)
 471  */
 472 static const char *quote_arg(const char *arg)
 473 {
 474         /* count chars to quote */
 475         int len = 0, n = 0;
 476         int force_quotes = 0;
 477         char *q, *d;
 478         const char *p = arg;
 479         if (!*p) force_quotes = 1;
 480         while (*p) {
 481                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 482                         force_quotes = 1;
 483                 else if (*p == '"')
 484                         n++;
 485                 else if (*p == '\\') {
 486                         int count = 0;
 487                         while (*p == '\\') {
 488                                 count++;
 489                                 p++;
 490                                 len++;
 491                         }
 492                         if (*p == '"')
 493                                 n += count*2 + 1;
 494                         continue;
 495                 }
 496                 len++;
 497                 p++;
 498         }
 499         if (!force_quotes && n == 0)
 500                 return arg;
 501
 502         /* insert \ where necessary */
 503         d = q = xmalloc(len+n+3);
 504         *d++ = '"';
 505         while (*arg) {
 506                 if (*arg == '"')
 507                         *d++ = '\\';
 508                 else if (*arg == '\\') {
 509                         int count = 0;
 510                         while (*arg == '\\') {
 511                                 count++;
 512                                 *d++ = *arg++;
 513                         }
 514                         if (*arg == '"') {
 515                                 while (count-- > 0)
 516                                         *d++ = '\\';
 517                                 *d++ = '\\';
 518                         }
 519                 }
 520                 *d++ = *arg++;
 521         }
 522         *d++ = '"';
 523         *d++ = 0;
 524         return q;
 525 }
 526
 527 static const char *parse_interpreter(const char *cmd)
 528 {
 529         static char buf[100];
 530         char *p, *opt;
 531         int n, fd;
 532
 533         /* don't even try a .exe */
 534         n = strlen(cmd);
 535         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 536                 return NULL;
 537
 538         fd = open(cmd, O_RDONLY);
 539         if (fd < 0)
 540                 return NULL;
 541         n = read(fd, buf, sizeof(buf)-1);
 542         close(fd);
 543         if (n < 4)      /* at least '#!/x' and not error */
 544                 return NULL;
 545
 546         if (buf[0] != '#' || buf[1] != '!')
 547                 return NULL;
 548         buf[n] = '\0';
 549         p = buf + strcspn(buf, "\r\n");
 550         if (!*p)
 551                 return NULL;
 552
 553         *p = '\0';
 554         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 555                 return NULL;
 556         /* strip options */
 557         if ((opt = strchr(p+1, ' ')))
 558                 *opt = '\0';
 559         return p+1;
 560 }
 561
 562 /*
 563  * Splits the PATH into parts.
 564  */
 565 static char **get_path_split(void)
 566 {
 567         char *p, **path, *envpath = getenv("PATH");
 568         int i, n = 0;
 569
 570         if (!envpath || !*envpath)
 571                 return NULL;
 572
 573         envpath = xstrdup(envpath);
 574         p = envpath;
 575         while (p) {
 576                 char *dir = p;
 577                 p = strchr(p, ';');
 578                 if (p) *p++ = '\0';
 579                 if (*dir) {     /* not earlier, catches series of ; */
 580                         ++n;
 581                 }
 582         }
 583         if (!n)
 584                 return NULL;
 585
 586         path = xmalloc((n+1)*sizeof(char *));
 587         p = envpath;
 588         i = 0;
 589         do {
 590                 if (*p)
 591                         path[i++] = xstrdup(p);
 592                 p = p+strlen(p)+1;
 593         } while (i < n);
 594         path[i] = NULL;
 595
 596         free(envpath);
 597
 598         return path;
 599 }
 600
 601 static void free_path_split(char **path)
 602 {
 603         char **p = path;
 604
 605         if (!path)
 606                 return;
 607
 608         while (*p)
 609                 free(*p++);
 610         free(path);
 611 }
 612
 613 /*
 614  * exe_only means that we only want to detect .exe files, but not scripts
 615  * (which do not have an extension)
 616  */
 617 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 618 {
 619         char path[MAX_PATH];
 620         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 621
 622         if (!isexe && access(path, F_OK) == 0)
 623                 return xstrdup(path);
 624         path[strlen(path)-4] = '\0';
 625         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 626                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 627                         return xstrdup(path);
 628         return NULL;
 629 }
 630
 631 /*
 632  * Determines the absolute path of cmd using the the split path in path.
 633  * If cmd contains a slash or backslash, no lookup is performed.
 634  */
 635 static char *path_lookup(const char *cmd, char **path, int exe_only)
 636 {
 637         char *prog = NULL;
 638         int len = strlen(cmd);
 639         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 640
 641         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 642                 prog = xstrdup(cmd);
 643
 644         while (!prog && *path)
 645                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 646
 647         return prog;
 648 }
 649
 650 static int env_compare(const void *a, const void *b)
 651 {
 652         char *const *ea = a;
 653         char *const *eb = b;
 654         return strcasecmp(*ea, *eb);
 655 }
 656
 657 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 658                            int prepend_cmd)
 659 {
 660         STARTUPINFO si;
 661         PROCESS_INFORMATION pi;
 662         struct strbuf envblk, args;
 663         unsigned flags;
 664         BOOL ret;
 665
 666         /* Determine whether or not we are associated to a console */
 667         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 668                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 669                         FILE_ATTRIBUTE_NORMAL, NULL);
 670         if (cons == INVALID_HANDLE_VALUE) {
 671                 /* There is no console associated with this process.
 672                  * Since the child is a console process, Windows
 673                  * would normally create a console window. But
 674                  * since we'll be redirecting std streams, we do
 675                  * not need the console.
 676                  * It is necessary to use DETACHED_PROCESS
 677                  * instead of CREATE_NO_WINDOW to make ssh
 678                  * recognize that it has no console.
 679                  */
 680                 flags = DETACHED_PROCESS;
 681         } else {
 682                 /* There is already a console. If we specified
 683                  * DETACHED_PROCESS here, too, Windows would
 684                  * disassociate the child from the console.
 685                  * The same is true for CREATE_NO_WINDOW.
 686                  * Go figure!
 687                  */
 688                 flags = 0;
 689                 CloseHandle(cons);
 690         }
 691         memset(&si, 0, sizeof(si));
 692         si.cb = sizeof(si);
 693         si.dwFlags = STARTF_USESTDHANDLES;
 694         si.hStdInput = (HANDLE) _get_osfhandle(0);
 695         si.hStdOutput = (HANDLE) _get_osfhandle(1);
 696         si.hStdError = (HANDLE) _get_osfhandle(2);
 697
 698         /* concatenate argv, quoting args as we go */
 699         strbuf_init(&args, 0);
 700         if (prepend_cmd) {
 701                 char *quoted = (char *)quote_arg(cmd);
 702                 strbuf_addstr(&args, quoted);
 703                 if (quoted != cmd)
 704                         free(quoted);
 705         }
 706         for (; *argv; argv++) {
 707                 char *quoted = (char *)quote_arg(*argv);
 708                 if (*args.buf)
 709                         strbuf_addch(&args, ' ');
 710                 strbuf_addstr(&args, quoted);
 711                 if (quoted != *argv)
 712                         free(quoted);
 713         }
 714
 715         if (env) {
 716                 int count = 0;
 717                 char **e, **sorted_env;
 718
 719                 for (e = env; *e; e++)
 720                         count++;
 721
 722                 /* environment must be sorted */
 723                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 724                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 725                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 726
 727                 strbuf_init(&envblk, 0);
 728                 for (e = sorted_env; *e; e++) {
 729                         strbuf_addstr(&envblk, *e);
 730                         strbuf_addch(&envblk, '\0');
 731                 }
 732                 free(sorted_env);
 733         }
 734
 735         memset(&pi, 0, sizeof(pi));
 736         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 737                 env ? envblk.buf : NULL, NULL, &si, &pi);
 738
 739         if (env)
 740                 strbuf_release(&envblk);
 741         strbuf_release(&args);
 742
 743         if (!ret) {
 744                 errno = ENOENT;
 745                 return -1;
 746         }
 747         CloseHandle(pi.hThread);
 748         return (pid_t)pi.hProcess;
 749 }
 750
 751 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 752 {
 753         pid_t pid;
 754         char **path = get_path_split();
 755         char *prog = path_lookup(cmd, path, 0);
 756
 757         if (!prog) {
 758                 errno = ENOENT;
 759                 pid = -1;
 760         }
 761         else {
 762                 const char *interpr = parse_interpreter(prog);
 763
 764                 if (interpr) {
 765                         const char *argv0 = argv[0];
 766                         char *iprog = path_lookup(interpr, path, 1);
 767                         argv[0] = prog;
 768                         if (!iprog) {
 769                                 errno = ENOENT;
 770                                 pid = -1;
 771                         }
 772                         else {
 773                                 pid = mingw_spawnve(iprog, argv, env, 1);
 774                                 free(iprog);
 775                         }
 776                         argv[0] = argv0;
 777                 }
 778                 else
 779                         pid = mingw_spawnve(prog, argv, env, 0);
 780                 free(prog);
 781         }
 782         free_path_split(path);
 783         return pid;
 784 }
 785
 786 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 787 {
 788         const char *interpr = parse_interpreter(cmd);
 789         char **path;
 790         char *prog;
 791         int pid = 0;
 792
 793         if (!interpr)
 794                 return 0;
 795         path = get_path_split();
 796         prog = path_lookup(interpr, path, 1);
 797         if (prog) {
 798                 int argc = 0;
 799                 const char **argv2;
 800                 while (argv[argc]) argc++;
 801                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 802                 argv2[0] = (char *)cmd; /* full path to the script file */
 803                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 804                 pid = mingw_spawnve(prog, argv2, env, 1);
 805                 if (pid >= 0) {
 806                         int status;
 807                         if (waitpid(pid, &status, 0) < 0)
 808                                 status = 255;
 809                         exit(status);
 810                 }
 811                 pid = 1;        /* indicate that we tried but failed */
 812                 free(prog);
 813                 free(argv2);
 814         }
 815         free_path_split(path);
 816         return pid;
 817 }
 818
 819 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 820 {
 821         /* check if git_command is a shell script */
 822         if (!try_shell_exec(cmd, argv, (char **)env)) {
 823                 int pid, status;
 824
 825                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 826                 if (pid < 0)
 827                         return;
 828                 if (waitpid(pid, &status, 0) < 0)
 829                         status = 255;
 830                 exit(status);
 831         }
 832 }
 833
 834 void mingw_execvp(const char *cmd, char *const *argv)
 835 {
 836         char **path = get_path_split();
 837         char *prog = path_lookup(cmd, path, 0);
 838
 839         if (prog) {
 840                 mingw_execve(prog, argv, environ);
 841                 free(prog);
 842         } else
 843                 errno = ENOENT;
 844
 845         free_path_split(path);
 846 }
 847
 848 static char **copy_environ(void)
 849 {
 850         char **env;
 851         int i = 0;
 852         while (environ[i])
 853                 i++;
 854         env = xmalloc((i+1)*sizeof(*env));
 855         for (i = 0; environ[i]; i++)
 856                 env[i] = xstrdup(environ[i]);
 857         env[i] = NULL;
 858         return env;
 859 }
 860
 861 void free_environ(char **env)
 862 {
 863         int i;
 864         for (i = 0; env[i]; i++)
 865                 free(env[i]);
 866         free(env);
 867 }
 868
 869 static int lookup_env(char **env, const char *name, size_t nmln)
 870 {
 871         int i;
 872
 873         for (i = 0; env[i]; i++) {
 874                 if (0 == strncmp(env[i], name, nmln)
 875                     && '=' == env[i][nmln])
 876                         /* matches */
 877                         return i;
 878         }
 879         return -1;
 880 }
 881
 882 /*
 883  * If name contains '=', then sets the variable, otherwise it unsets it
 884  */
 885 static char **env_setenv(char **env, const char *name)
 886 {
 887         char *eq = strchrnul(name, '=');
 888         int i = lookup_env(env, name, eq-name);
 889
 890         if (i < 0) {
 891                 if (*eq) {
 892                         for (i = 0; env[i]; i++)
 893                                 ;
 894                         env = xrealloc(env, (i+2)*sizeof(*env));
 895                         env[i] = xstrdup(name);
 896                         env[i+1] = NULL;
 897                 }
 898         }
 899         else {
 900                 free(env[i]);
 901                 if (*eq)
 902                         env[i] = xstrdup(name);
 903                 else
 904                         for (; env[i]; i++)
 905                                 env[i] = env[i+1];
 906         }
 907         return env;
 908 }
 909
 910 /*
 911  * Copies global environ and adjusts variables as specified by vars.
 912  */
 913 char **make_augmented_environ(const char *const *vars)
 914 {
 915         char **env = copy_environ();
 916
 917         while (*vars)
 918                 env = env_setenv(env, *vars++);
 919         return env;
 920 }
 921
 922 /* this is the first function to call into WS_32; initialize it */
 923 #undef gethostbyname
 924 struct hostent *mingw_gethostbyname(const char *host)
 925 {
 926         WSADATA wsa;
 927
 928         if (WSAStartup(MAKEWORD(2,2), &wsa))
 929                 die("unable to initialize winsock subsystem, error %d",
 930                         WSAGetLastError());
 931         atexit((void(*)(void)) WSACleanup);
 932         return gethostbyname(host);
 933 }
 934
 935 int mingw_socket(int domain, int type, int protocol)
 936 {
 937         int sockfd;
 938         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
 939         if (s == INVALID_SOCKET) {
 940                 /*
 941                  * WSAGetLastError() values are regular BSD error codes
 942                  * biased by WSABASEERR.
 943                  * However, strerror() does not know about networking
 944                  * specific errors, which are values beginning at 38 or so.
 945                  * Therefore, we choose to leave the biased error code
 946                  * in errno so that _if_ someone looks up the code somewhere,
 947                  * then it is at least the number that are usually listed.
 948                  */
 949                 errno = WSAGetLastError();
 950                 return -1;
 951         }
 952         /* convert into a file descriptor */
 953         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
 954                 closesocket(s);
 955                 return error("unable to make a socket file descriptor: %s",
 956                         strerror(errno));
 957         }
 958         return sockfd;
 959 }
 960
 961 #undef connect
 962 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
 963 {
 964         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
 965         return connect(s, sa, sz);
 966 }
 967
 968 #undef rename
 969 int mingw_rename(const char *pold, const char *pnew)
 970 {
 971         DWORD attrs, gle;
 972         int tries = 0;
 973         static const int delay[] = { 0, 1, 10, 20, 40 };
 974
 975         /*
 976          * Try native rename() first to get errno right.
 977          * It is based on MoveFile(), which cannot overwrite existing files.
 978          */
 979         if (!rename(pold, pnew))
 980                 return 0;
 981         if (errno != EEXIST)
 982                 return -1;
 983 repeat:
 984         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 985                 return 0;
 986         /* TODO: translate more errors */
 987         gle = GetLastError();
 988         if (gle == ERROR_ACCESS_DENIED &&
 989             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
 990                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
 991                         errno = EISDIR;
 992                         return -1;
 993                 }
 994                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
 995                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
 996                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 997                                 return 0;
 998                         gle = GetLastError();
 999                         /* revert file attributes on failure */
1000                         SetFileAttributes(pnew, attrs);
1001                 }
1002         }
1003         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1004                 /*
1005                  * We assume that some other process had the source or
1006                  * destination file open at the wrong moment and retry.
1007                  * In order to give the other process a higher chance to
1008                  * complete its operation, we give up our time slice now.
1009                  * If we have to retry again, we do sleep a bit.
1010                  */
1011                 Sleep(delay[tries]);
1012                 tries++;
1013                 goto repeat;
1014         }
1015         errno = EACCES;
1016         return -1;
1017 }
1018
1019 struct passwd *getpwuid(int uid)
1020 {
1021         static char user_name[100];
1022         static struct passwd p;
1023
1024         DWORD len = sizeof(user_name);
1025         if (!GetUserName(user_name, &len))
1026                 return NULL;
1027         p.pw_name = user_name;
1028         p.pw_gecos = "unknown";
1029         p.pw_dir = NULL;
1030         return &p;
1031 }
1032
1033 static HANDLE timer_event;
1034 static HANDLE timer_thread;
1035 static int timer_interval;
1036 static int one_shot;
1037 static sig_handler_t timer_fn = SIG_DFL;
1038
1039 /* The timer works like this:
1040  * The thread, ticktack(), is a trivial routine that most of the time
1041  * only waits to receive the signal to terminate. The main thread tells
1042  * the thread to terminate by setting the timer_event to the signalled
1043  * state.
1044  * But ticktack() interrupts the wait state after the timer's interval
1045  * length to call the signal handler.
1046  */
1047
1048 static unsigned __stdcall ticktack(void *dummy)
1049 {
1050         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1051                 if (timer_fn == SIG_DFL)
1052                         die("Alarm");
1053                 if (timer_fn != SIG_IGN)
1054                         timer_fn(SIGALRM);
1055                 if (one_shot)
1056                         break;
1057         }
1058         return 0;
1059 }
1060
1061 static int start_timer_thread(void)
1062 {
1063         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1064         if (timer_event) {
1065                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1066                 if (!timer_thread )
1067                         return errno = ENOMEM,
1068                                 error("cannot start timer thread");
1069         } else
1070                 return errno = ENOMEM,
1071                         error("cannot allocate resources for timer");
1072         return 0;
1073 }
1074
1075 static void stop_timer_thread(void)
1076 {
1077         if (timer_event)
1078                 SetEvent(timer_event);  /* tell thread to terminate */
1079         if (timer_thread) {
1080                 int rc = WaitForSingleObject(timer_thread, 1000);
1081                 if (rc == WAIT_TIMEOUT)
1082                         error("timer thread did not terminate timely");
1083                 else if (rc != WAIT_OBJECT_0)
1084                         error("waiting for timer thread failed: %lu",
1085                               GetLastError());
1086                 CloseHandle(timer_thread);
1087         }
1088         if (timer_event)
1089                 CloseHandle(timer_event);
1090         timer_event = NULL;
1091         timer_thread = NULL;
1092 }
1093
1094 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1095 {
1096         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1097 }
1098
1099 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1100 {
1101         static const struct timeval zero;
1102         static int atexit_done;
1103
1104         if (out != NULL)
1105                 return errno = EINVAL,
1106                         error("setitimer param 3 != NULL not implemented");
1107         if (!is_timeval_eq(&in->it_interval, &zero) &&
1108             !is_timeval_eq(&in->it_interval, &in->it_value))
1109                 return errno = EINVAL,
1110                         error("setitimer: it_interval must be zero or eq it_value");
1111
1112         if (timer_thread)
1113                 stop_timer_thread();
1114
1115         if (is_timeval_eq(&in->it_value, &zero) &&
1116             is_timeval_eq(&in->it_interval, &zero))
1117                 return 0;
1118
1119         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1120         one_shot = is_timeval_eq(&in->it_interval, &zero);
1121         if (!atexit_done) {
1122                 atexit(stop_timer_thread);
1123                 atexit_done = 1;
1124         }
1125         return start_timer_thread();
1126 }
1127
1128 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1129 {
1130         if (sig != SIGALRM)
1131                 return errno = EINVAL,
1132                         error("sigaction only implemented for SIGALRM");
1133         if (out != NULL)
1134                 return errno = EINVAL,
1135                         error("sigaction: param 3 != NULL not implemented");
1136
1137         timer_fn = in->sa_handler;
1138         return 0;
1139 }
1140
1141 #undef signal
1142 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1143 {
1144         sig_handler_t old = timer_fn;
1145         if (sig != SIGALRM)
1146                 return signal(sig, handler);
1147         timer_fn = handler;
1148         return old;
1149 }
1150
1151 static const char *make_backslash_path(const char *path)
1152 {
1153         static char buf[PATH_MAX + 1];
1154         char *c;
1155
1156         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1157                 die("Too long path: %.*s", 60, path);
1158
1159         for (c = buf; *c; c++) {
1160                 if (*c == '/')
1161                         *c = '\\';
1162         }
1163         return buf;
1164 }
1165
1166 void mingw_open_html(const char *unixpath)
1167 {
1168         const char *htmlpath = make_backslash_path(unixpath);
1169         printf("Launching default browser to display HTML ...\n");
1170         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1171 }
1172
1173 int link(const char *oldpath, const char *newpath)
1174 {
1175         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1176         static T create_hard_link = NULL;
1177         if (!create_hard_link) {
1178                 create_hard_link = (T) GetProcAddress(
1179                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1180                 if (!create_hard_link)
1181                         create_hard_link = (T)-1;
1182         }
1183         if (create_hard_link == (T)-1) {
1184                 errno = ENOSYS;
1185                 return -1;
1186         }
1187         if (!create_hard_link(newpath, oldpath, NULL)) {
1188                 errno = err_win_to_posix(GetLastError());
1189                 return -1;
1190         }
1191         return 0;
1192 }
1193
1194 int symlink(const char *oldpath, const char *newpath)
1195 {
1196         typedef BOOL WINAPI (*symlink_fn)(const char*, const char*, DWORD);
1197         static symlink_fn create_symbolic_link = NULL;
1198         if (!create_symbolic_link) {
1199                 create_symbolic_link = (symlink_fn) GetProcAddress(
1200                                 GetModuleHandle("kernel32.dll"), "CreateSymbolicLinkA");
1201                 if (!create_symbolic_link)
1202                         create_symbolic_link = (symlink_fn)-1;
1203         }
1204         if (create_symbolic_link == (symlink_fn)-1) {
1205                 errno = ENOSYS;
1206                 return -1;
1207         }
1208
1209         if (!create_symbolic_link(newpath, oldpath, 0)) {
1210                 errno = err_win_to_posix(GetLastError());
1211                 return -1;
1212         }
1213         return 0;
1214 }
1215
1216 int readlink(const char *path, char *buf, size_t bufsiz)
1217 {
1218         HANDLE handle = CreateFile(path, GENERIC_READ,
1219                         FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
1220                         NULL, OPEN_EXISTING,
1221                         FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
1222                         NULL);
1223
1224         if (handle != INVALID_HANDLE_VALUE) {
1225                 unsigned char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
1226                 DWORD dummy = 0;
1227                 if (DeviceIoControl(handle, FSCTL_GET_REPARSE_POINT, NULL, 0, buffer,
1228                         MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &dummy, NULL)) {
1229                         REPARSE_DATA_BUFFER *b = (REPARSE_DATA_BUFFER *) buffer;
1230                         if (b->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
1231                                 int len = b->SymbolicLinkReparseBuffer.SubstituteNameLength / sizeof(wchar_t);
1232                                 int offset = b->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(wchar_t);
1233                                 snprintf(buf, bufsiz, "%*ls", len,  & b->SymbolicLinkReparseBuffer.PathBuffer[offset]);
1234                                 CloseHandle(handle);
1235                                 return len;
1236                         }
1237                 }
1238
1239                 CloseHandle(handle);
1240         }
1241
1242         errno = EINVAL;
1243         return -1;
1244 }
1245
1246 char *getpass(const char *prompt)
1247 {
1248         struct strbuf buf = STRBUF_INIT;
1249
1250         fputs(prompt, stderr);
1251         for (;;) {
1252                 char c = _getch();
1253                 if (c == '\r' || c == '\n')
1254                         break;
1255                 strbuf_addch(&buf, c);
1256         }
1257         fputs("\n", stderr);
1258         return strbuf_detach(&buf, NULL);
1259 }
1260
1261 #ifndef NO_MINGW_REPLACE_READDIR
1262 /* MinGW readdir implementation to avoid extra lstats for Git */
1263 struct mingw_DIR
1264 {
1265         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1266         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1267         long                    dd_handle;      /* _findnext handle */
1268         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1269         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1270 };
1271
1272 struct dirent *mingw_readdir(DIR *dir)
1273 {
1274         WIN32_FIND_DATAA buf;
1275         HANDLE handle;
1276         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1277
1278         if (!dir->dd_handle) {
1279                 errno = EBADF; /* No set_errno for mingw */
1280                 return NULL;
1281         }
1282
1283         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1284         {
1285                 DWORD lasterr;
1286                 handle = FindFirstFileA(dir->dd_name, &buf);
1287                 lasterr = GetLastError();
1288                 dir->dd_handle = (long)handle;
1289                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1290                         errno = err_win_to_posix(lasterr);
1291                         return NULL;
1292                 }
1293         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1294                 return NULL;
1295         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1296                 DWORD lasterr = GetLastError();
1297                 FindClose((HANDLE)dir->dd_handle);
1298                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1299                 /* POSIX says you shouldn't set errno when readdir can't
1300                    find any more files; so, if another error we leave it set. */
1301                 if (lasterr != ERROR_NO_MORE_FILES)
1302                         errno = err_win_to_posix(lasterr);
1303                 return NULL;
1304         }
1305
1306         /* We get here if `buf' contains valid data.  */
1307         strcpy(dir->dd_dir.d_name, buf.cFileName);
1308         ++dir->dd_stat;
1309
1310         /* Set file type, based on WIN32_FIND_DATA */
1311         mdir->dd_dir.d_type = 0;
1312         if ((buf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
1313                         (buf.dwReserved0 == IO_REPARSE_TAG_SYMLINK))
1314                 mdir->dd_dir.d_type |= DT_LNK;
1315         else if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1316                 mdir->dd_dir.d_type |= DT_DIR;
1317         else
1318                 mdir->dd_dir.d_type |= DT_REG;
1319
1320         return (struct dirent*)&dir->dd_dir;
1321 }
1322 #endif // !NO_MINGW_REPLACE_READDIR