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 /*
 155  * We keep the do_lstat code in a separate function to avoid recursion.
 156  * When a path ends with a slash, the stat will fail with ENOENT. In
 157  * this case, we strip the trailing slashes and stat again.
 158  */
 159 static int do_lstat(const char *file_name, struct stat *buf)
 160 {
 161         WIN32_FILE_ATTRIBUTE_DATA fdata;
 162
 163         if (!(errno = get_file_attr(file_name, &fdata))) {
 164                 buf->st_ino = 0;
 165                 buf->st_gid = 0;
 166                 buf->st_uid = 0;
 167                 buf->st_nlink = 1;
 168                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 169                 buf->st_size = fdata.nFileSizeLow |
 170                         (((off_t)fdata.nFileSizeHigh)<<32);
 171                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 172                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 173                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 174                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 175                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 176                         WIN32_FIND_DATAA findbuf;
 177                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 178                         if (handle != INVALID_HANDLE_VALUE) {
 179                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 180                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 181                                         char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 182                                         buf->st_mode = S_IREAD | S_IFLNK;
 183                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 184                                                 buf->st_mode |= S_IWRITE;
 185                                         buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 186                                 }
 187                                 FindClose(handle);
 188                         }
 189                 }
 190                 return 0;
 191         }
 192         return -1;
 193 }
 194
 195 /*
 196  * We provide our own lstat/fstat functions, since the provided
 197  * lstat/fstat functions are so slow. These stat functions are
 198  * tailored for Git's usage (read: fast), and are not meant to be
 199  * complete. Note that Git stat()s are redirected to mingw_lstat()
 200  * too, since Windows doesn't really handle symlinks that well.
 201  */
 202 int mingw_lstat(const char *file_name, struct stat *buf)
 203 {
 204         int namelen;
 205         static char alt_name[PATH_MAX];
 206
 207         if (!do_lstat(file_name, buf))
 208                 return 0;
 209
 210         /*
 211          * if file_name ended in a '/', Windows returned ENOENT;
 212          * try again without trailing slashes
 213          */
 214         if (errno != ENOENT)
 215                 return -1;
 216
 217         namelen = strlen(file_name);
 218         if (namelen && file_name[namelen-1] != '/')
 219                 return -1;
 220         while (namelen && file_name[namelen-1] == '/')
 221                 --namelen;
 222         if (!namelen || namelen >= PATH_MAX)
 223                 return -1;
 224
 225         memcpy(alt_name, file_name, namelen);
 226         alt_name[namelen] = 0;
 227         return do_lstat(alt_name, buf);
 228 }
 229
 230 #undef fstat
 231 int mingw_fstat(int fd, struct stat *buf)
 232 {
 233         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 234         BY_HANDLE_FILE_INFORMATION fdata;
 235
 236         if (fh == INVALID_HANDLE_VALUE) {
 237                 errno = EBADF;
 238                 return -1;
 239         }
 240         /* direct non-file handles to MS's fstat() */
 241         if (GetFileType(fh) != FILE_TYPE_DISK)
 242                 return _fstati64(fd, buf);
 243
 244         if (GetFileInformationByHandle(fh, &fdata)) {
 245                 buf->st_ino = 0;
 246                 buf->st_gid = 0;
 247                 buf->st_uid = 0;
 248                 buf->st_nlink = 1;
 249                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 250                 buf->st_size = fdata.nFileSizeLow |
 251                         (((off_t)fdata.nFileSizeHigh)<<32);
 252                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 253                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 254                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 255                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 256                 return 0;
 257         }
 258         errno = EBADF;
 259         return -1;
 260 }
 261
 262 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 263 {
 264         long long winTime = t * 10000000LL + 116444736000000000LL;
 265         ft->dwLowDateTime = winTime;
 266         ft->dwHighDateTime = winTime >> 32;
 267 }
 268
 269 int mingw_utime (const char *file_name, const struct utimbuf *times)
 270 {
 271         FILETIME mft, aft;
 272         int fh, rc;
 273
 274         /* must have write permission */
 275         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 276                 return -1;
 277
 278         time_t_to_filetime(times->modtime, &mft);
 279         time_t_to_filetime(times->actime, &aft);
 280         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 281                 errno = EINVAL;
 282                 rc = -1;
 283         } else
 284                 rc = 0;
 285         close(fh);
 286         return rc;
 287 }
 288
 289 unsigned int sleep (unsigned int seconds)
 290 {
 291         Sleep(seconds*1000);
 292         return 0;
 293 }
 294
 295 int mkstemp(char *template)
 296 {
 297         char *filename = mktemp(template);
 298         if (filename == NULL)
 299                 return -1;
 300         return open(filename, O_RDWR | O_CREAT, 0600);
 301 }
 302
 303 int gettimeofday(struct timeval *tv, void *tz)
 304 {
 305         SYSTEMTIME st;
 306         struct tm tm;
 307         GetSystemTime(&st);
 308         tm.tm_year = st.wYear-1900;
 309         tm.tm_mon = st.wMonth-1;
 310         tm.tm_mday = st.wDay;
 311         tm.tm_hour = st.wHour;
 312         tm.tm_min = st.wMinute;
 313         tm.tm_sec = st.wSecond;
 314         tv->tv_sec = tm_to_time_t(&tm);
 315         if (tv->tv_sec < 0)
 316                 return -1;
 317         tv->tv_usec = st.wMilliseconds*1000;
 318         return 0;
 319 }
 320
 321 int pipe(int filedes[2])
 322 {
 323         int fd;
 324         HANDLE h[2], parent;
 325
 326         if (_pipe(filedes, 8192, 0) < 0)
 327                 return -1;
 328
 329         parent = GetCurrentProcess();
 330
 331         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 332                         parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 333                 close(filedes[0]);
 334                 close(filedes[1]);
 335                 return -1;
 336         }
 337         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 338                         parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 339                 close(filedes[0]);
 340                 close(filedes[1]);
 341                 CloseHandle(h[0]);
 342                 return -1;
 343         }
 344         fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 345         if (fd < 0) {
 346                 close(filedes[0]);
 347                 close(filedes[1]);
 348                 CloseHandle(h[0]);
 349                 CloseHandle(h[1]);
 350                 return -1;
 351         }
 352         close(filedes[0]);
 353         filedes[0] = fd;
 354         fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 355         if (fd < 0) {
 356                 close(filedes[0]);
 357                 close(filedes[1]);
 358                 CloseHandle(h[1]);
 359                 return -1;
 360         }
 361         close(filedes[1]);
 362         filedes[1] = fd;
 363         return 0;
 364 }
 365
 366 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 367 {
 368         int i, pending;
 369
 370         if (timeout >= 0) {
 371                 if (nfds == 0) {
 372                         Sleep(timeout);
 373                         return 0;
 374                 }
 375                 return errno = EINVAL, error("poll timeout not supported");
 376         }
 377
 378         /*
 379          * When there is only one fd to wait for, then we pretend that
 380          * input is available and let the actual wait happen when the
 381          * caller invokes read().
 382          */
 383         if (nfds == 1) {
 384                 if (!(ufds[0].events & POLLIN))
 385                         return errno = EINVAL, error("POLLIN not set");
 386                 ufds[0].revents = POLLIN;
 387                 return 0;
 388         }
 389
 390 repeat:
 391         pending = 0;
 392         for (i = 0; i < nfds; i++) {
 393                 DWORD avail = 0;
 394                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 395                 if (h == INVALID_HANDLE_VALUE)
 396                         return -1;      /* errno was set */
 397
 398                 if (!(ufds[i].events & POLLIN))
 399                         return errno = EINVAL, error("POLLIN not set");
 400
 401                 /* this emulation works only for pipes */
 402                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 403                         int err = GetLastError();
 404                         if (err == ERROR_BROKEN_PIPE) {
 405                                 ufds[i].revents = POLLHUP;
 406                                 pending++;
 407                         } else {
 408                                 errno = EINVAL;
 409                                 return error("PeekNamedPipe failed,"
 410                                         " GetLastError: %u", err);
 411                         }
 412                 } else if (avail) {
 413                         ufds[i].revents = POLLIN;
 414                         pending++;
 415                 } else
 416                         ufds[i].revents = 0;
 417         }
 418         if (!pending) {
 419                 /*
 420                  * The only times that we spin here is when the process
 421                  * that is connected through the pipes is waiting for
 422                  * its own input data to become available. But since
 423                  * the process (pack-objects) is itself CPU intensive,
 424                  * it will happily pick up the time slice that we are
 425                  * relinquishing here.
 426                  */
 427                 Sleep(0);
 428                 goto repeat;
 429         }
 430         return 0;
 431 }
 432
 433 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 434 {
 435         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 436         memcpy(result, gmtime(timep), sizeof(struct tm));
 437         return result;
 438 }
 439
 440 struct tm *localtime_r(const time_t *timep, struct tm *result)
 441 {
 442         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 443         memcpy(result, localtime(timep), sizeof(struct tm));
 444         return result;
 445 }
 446
 447 #undef getcwd
 448 char *mingw_getcwd(char *pointer, int len)
 449 {
 450         int i;
 451         char *ret = getcwd(pointer, len);
 452         if (!ret)
 453                 return ret;
 454         for (i = 0; pointer[i]; i++)
 455                 if (pointer[i] == '\\')
 456                         pointer[i] = '/';
 457         return ret;
 458 }
 459
 460 #undef getenv
 461 char *mingw_getenv(const char *name)
 462 {
 463         char *result = getenv(name);
 464         if (!result && !strcmp(name, "TMPDIR")) {
 465                 /* on Windows it is TMP and TEMP */
 466                 result = getenv("TMP");
 467                 if (!result)
 468                         result = getenv("TEMP");
 469         }
 470         return result;
 471 }
 472
 473 /*
 474  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 475  * (Parsing C++ Command-Line Arguments)
 476  */
 477 static const char *quote_arg(const char *arg)
 478 {
 479         /* count chars to quote */
 480         int len = 0, n = 0;
 481         int force_quotes = 0;
 482         char *q, *d;
 483         const char *p = arg;
 484         if (!*p) force_quotes = 1;
 485         while (*p) {
 486                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 487                         force_quotes = 1;
 488                 else if (*p == '"')
 489                         n++;
 490                 else if (*p == '\\') {
 491                         int count = 0;
 492                         while (*p == '\\') {
 493                                 count++;
 494                                 p++;
 495                                 len++;
 496                         }
 497                         if (*p == '"')
 498                                 n += count*2 + 1;
 499                         continue;
 500                 }
 501                 len++;
 502                 p++;
 503         }
 504         if (!force_quotes && n == 0)
 505                 return arg;
 506
 507         /* insert \ where necessary */
 508         d = q = xmalloc(len+n+3);
 509         *d++ = '"';
 510         while (*arg) {
 511                 if (*arg == '"')
 512                         *d++ = '\\';
 513                 else if (*arg == '\\') {
 514                         int count = 0;
 515                         while (*arg == '\\') {
 516                                 count++;
 517                                 *d++ = *arg++;
 518                         }
 519                         if (*arg == '"') {
 520                                 while (count-- > 0)
 521                                         *d++ = '\\';
 522                                 *d++ = '\\';
 523                         }
 524                 }
 525                 *d++ = *arg++;
 526         }
 527         *d++ = '"';
 528         *d++ = 0;
 529         return q;
 530 }
 531
 532 static const char *parse_interpreter(const char *cmd)
 533 {
 534         static char buf[100];
 535         char *p, *opt;
 536         int n, fd;
 537
 538         /* don't even try a .exe */
 539         n = strlen(cmd);
 540         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 541                 return NULL;
 542
 543         fd = open(cmd, O_RDONLY);
 544         if (fd < 0)
 545                 return NULL;
 546         n = read(fd, buf, sizeof(buf)-1);
 547         close(fd);
 548         if (n < 4)      /* at least '#!/x' and not error */
 549                 return NULL;
 550
 551         if (buf[0] != '#' || buf[1] != '!')
 552                 return NULL;
 553         buf[n] = '\0';
 554         p = buf + strcspn(buf, "\r\n");
 555         if (!*p)
 556                 return NULL;
 557
 558         *p = '\0';
 559         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 560                 return NULL;
 561         /* strip options */
 562         if ((opt = strchr(p+1, ' ')))
 563                 *opt = '\0';
 564         return p+1;
 565 }
 566
 567 /*
 568  * Splits the PATH into parts.
 569  */
 570 static char **get_path_split(void)
 571 {
 572         char *p, **path, *envpath = getenv("PATH");
 573         int i, n = 0;
 574
 575         if (!envpath || !*envpath)
 576                 return NULL;
 577
 578         envpath = xstrdup(envpath);
 579         p = envpath;
 580         while (p) {
 581                 char *dir = p;
 582                 p = strchr(p, ';');
 583                 if (p) *p++ = '\0';
 584                 if (*dir) {     /* not earlier, catches series of ; */
 585                         ++n;
 586                 }
 587         }
 588         if (!n)
 589                 return NULL;
 590
 591         path = xmalloc((n+1)*sizeof(char *));
 592         p = envpath;
 593         i = 0;
 594         do {
 595                 if (*p)
 596                         path[i++] = xstrdup(p);
 597                 p = p+strlen(p)+1;
 598         } while (i < n);
 599         path[i] = NULL;
 600
 601         free(envpath);
 602
 603         return path;
 604 }
 605
 606 static void free_path_split(char **path)
 607 {
 608         char **p = path;
 609
 610         if (!path)
 611                 return;
 612
 613         while (*p)
 614                 free(*p++);
 615         free(path);
 616 }
 617
 618 /*
 619  * exe_only means that we only want to detect .exe files, but not scripts
 620  * (which do not have an extension)
 621  */
 622 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 623 {
 624         char path[MAX_PATH];
 625         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 626
 627         if (!isexe && access(path, F_OK) == 0)
 628                 return xstrdup(path);
 629         path[strlen(path)-4] = '\0';
 630         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 631                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 632                         return xstrdup(path);
 633         return NULL;
 634 }
 635
 636 /*
 637  * Determines the absolute path of cmd using the the split path in path.
 638  * If cmd contains a slash or backslash, no lookup is performed.
 639  */
 640 static char *path_lookup(const char *cmd, char **path, int exe_only)
 641 {
 642         char *prog = NULL;
 643         int len = strlen(cmd);
 644         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 645
 646         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 647                 prog = xstrdup(cmd);
 648
 649         while (!prog && *path)
 650                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 651
 652         return prog;
 653 }
 654
 655 static int env_compare(const void *a, const void *b)
 656 {
 657         char *const *ea = a;
 658         char *const *eb = b;
 659         return strcasecmp(*ea, *eb);
 660 }
 661
 662 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 663                            int prepend_cmd)
 664 {
 665         STARTUPINFO si;
 666         PROCESS_INFORMATION pi;
 667         struct strbuf envblk, args;
 668         unsigned flags;
 669         BOOL ret;
 670
 671         /* Determine whether or not we are associated to a console */
 672         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 673                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 674                         FILE_ATTRIBUTE_NORMAL, NULL);
 675         if (cons == INVALID_HANDLE_VALUE) {
 676                 /*
 677                  * There is no console associated with this process.
 678                  * Since the child is a console process, Windows
 679                  * would normally create a console window. But
 680                  * since we'll be redirecting std streams, we do
 681                  * not need the console.
 682                  * It is necessary to use DETACHED_PROCESS
 683                  * instead of CREATE_NO_WINDOW to make ssh
 684                  * recognize that it has no console.
 685                  */
 686                 flags = DETACHED_PROCESS;
 687         } else {
 688                 /*
 689                  * There is already a console. If we specified
 690                  * DETACHED_PROCESS here, too, Windows would
 691                  * disassociate the child from the console.
 692                  * The same is true for CREATE_NO_WINDOW.
 693                  * Go figure!
 694                  */
 695                 flags = 0;
 696                 CloseHandle(cons);
 697         }
 698         memset(&si, 0, sizeof(si));
 699         si.cb = sizeof(si);
 700         si.dwFlags = STARTF_USESTDHANDLES;
 701         si.hStdInput = (HANDLE) _get_osfhandle(0);
 702         si.hStdOutput = (HANDLE) _get_osfhandle(1);
 703         si.hStdError = (HANDLE) _get_osfhandle(2);
 704
 705         /* concatenate argv, quoting args as we go */
 706         strbuf_init(&args, 0);
 707         if (prepend_cmd) {
 708                 char *quoted = (char *)quote_arg(cmd);
 709                 strbuf_addstr(&args, quoted);
 710                 if (quoted != cmd)
 711                         free(quoted);
 712         }
 713         for (; *argv; argv++) {
 714                 char *quoted = (char *)quote_arg(*argv);
 715                 if (*args.buf)
 716                         strbuf_addch(&args, ' ');
 717                 strbuf_addstr(&args, quoted);
 718                 if (quoted != *argv)
 719                         free(quoted);
 720         }
 721
 722         if (env) {
 723                 int count = 0;
 724                 char **e, **sorted_env;
 725
 726                 for (e = env; *e; e++)
 727                         count++;
 728
 729                 /* environment must be sorted */
 730                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 731                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 732                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 733
 734                 strbuf_init(&envblk, 0);
 735                 for (e = sorted_env; *e; e++) {
 736                         strbuf_addstr(&envblk, *e);
 737                         strbuf_addch(&envblk, '\0');
 738                 }
 739                 free(sorted_env);
 740         }
 741
 742         memset(&pi, 0, sizeof(pi));
 743         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 744                 env ? envblk.buf : NULL, NULL, &si, &pi);
 745
 746         if (env)
 747                 strbuf_release(&envblk);
 748         strbuf_release(&args);
 749
 750         if (!ret) {
 751                 errno = ENOENT;
 752                 return -1;
 753         }
 754         CloseHandle(pi.hThread);
 755         return (pid_t)pi.hProcess;
 756 }
 757
 758 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 759 {
 760         pid_t pid;
 761         char **path = get_path_split();
 762         char *prog = path_lookup(cmd, path, 0);
 763
 764         if (!prog) {
 765                 errno = ENOENT;
 766                 pid = -1;
 767         }
 768         else {
 769                 const char *interpr = parse_interpreter(prog);
 770
 771                 if (interpr) {
 772                         const char *argv0 = argv[0];
 773                         char *iprog = path_lookup(interpr, path, 1);
 774                         argv[0] = prog;
 775                         if (!iprog) {
 776                                 errno = ENOENT;
 777                                 pid = -1;
 778                         }
 779                         else {
 780                                 pid = mingw_spawnve(iprog, argv, env, 1);
 781                                 free(iprog);
 782                         }
 783                         argv[0] = argv0;
 784                 }
 785                 else
 786                         pid = mingw_spawnve(prog, argv, env, 0);
 787                 free(prog);
 788         }
 789         free_path_split(path);
 790         return pid;
 791 }
 792
 793 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 794 {
 795         const char *interpr = parse_interpreter(cmd);
 796         char **path;
 797         char *prog;
 798         int pid = 0;
 799
 800         if (!interpr)
 801                 return 0;
 802         path = get_path_split();
 803         prog = path_lookup(interpr, path, 1);
 804         if (prog) {
 805                 int argc = 0;
 806                 const char **argv2;
 807                 while (argv[argc]) argc++;
 808                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 809                 argv2[0] = (char *)cmd; /* full path to the script file */
 810                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 811                 pid = mingw_spawnve(prog, argv2, env, 1);
 812                 if (pid >= 0) {
 813                         int status;
 814                         if (waitpid(pid, &status, 0) < 0)
 815                                 status = 255;
 816                         exit(status);
 817                 }
 818                 pid = 1;        /* indicate that we tried but failed */
 819                 free(prog);
 820                 free(argv2);
 821         }
 822         free_path_split(path);
 823         return pid;
 824 }
 825
 826 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 827 {
 828         /* check if git_command is a shell script */
 829         if (!try_shell_exec(cmd, argv, (char **)env)) {
 830                 int pid, status;
 831
 832                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 833                 if (pid < 0)
 834                         return;
 835                 if (waitpid(pid, &status, 0) < 0)
 836                         status = 255;
 837                 exit(status);
 838         }
 839 }
 840
 841 void mingw_execvp(const char *cmd, char *const *argv)
 842 {
 843         char **path = get_path_split();
 844         char *prog = path_lookup(cmd, path, 0);
 845
 846         if (prog) {
 847                 mingw_execve(prog, argv, environ);
 848                 free(prog);
 849         } else
 850                 errno = ENOENT;
 851
 852         free_path_split(path);
 853 }
 854
 855 static char **copy_environ(void)
 856 {
 857         char **env;
 858         int i = 0;
 859         while (environ[i])
 860                 i++;
 861         env = xmalloc((i+1)*sizeof(*env));
 862         for (i = 0; environ[i]; i++)
 863                 env[i] = xstrdup(environ[i]);
 864         env[i] = NULL;
 865         return env;
 866 }
 867
 868 void free_environ(char **env)
 869 {
 870         int i;
 871         for (i = 0; env[i]; i++)
 872                 free(env[i]);
 873         free(env);
 874 }
 875
 876 static int lookup_env(char **env, const char *name, size_t nmln)
 877 {
 878         int i;
 879
 880         for (i = 0; env[i]; i++) {
 881                 if (0 == strncmp(env[i], name, nmln)
 882                     && '=' == env[i][nmln])
 883                         /* matches */
 884                         return i;
 885         }
 886         return -1;
 887 }
 888
 889 /*
 890  * If name contains '=', then sets the variable, otherwise it unsets it
 891  */
 892 static char **env_setenv(char **env, const char *name)
 893 {
 894         char *eq = strchrnul(name, '=');
 895         int i = lookup_env(env, name, eq-name);
 896
 897         if (i < 0) {
 898                 if (*eq) {
 899                         for (i = 0; env[i]; i++)
 900                                 ;
 901                         env = xrealloc(env, (i+2)*sizeof(*env));
 902                         env[i] = xstrdup(name);
 903                         env[i+1] = NULL;
 904                 }
 905         }
 906         else {
 907                 free(env[i]);
 908                 if (*eq)
 909                         env[i] = xstrdup(name);
 910                 else
 911                         for (; env[i]; i++)
 912                                 env[i] = env[i+1];
 913         }
 914         return env;
 915 }
 916
 917 /*
 918  * Copies global environ and adjusts variables as specified by vars.
 919  */
 920 char **make_augmented_environ(const char *const *vars)
 921 {
 922         char **env = copy_environ();
 923
 924         while (*vars)
 925                 env = env_setenv(env, *vars++);
 926         return env;
 927 }
 928
 929 /* this is the first function to call into WS_32; initialize it */
 930 #undef gethostbyname
 931 struct hostent *mingw_gethostbyname(const char *host)
 932 {
 933         WSADATA wsa;
 934
 935         if (WSAStartup(MAKEWORD(2,2), &wsa))
 936                 die("unable to initialize winsock subsystem, error %d",
 937                         WSAGetLastError());
 938         atexit((void(*)(void)) WSACleanup);
 939         return gethostbyname(host);
 940 }
 941
 942 int mingw_socket(int domain, int type, int protocol)
 943 {
 944         int sockfd;
 945         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
 946         if (s == INVALID_SOCKET) {
 947                 /*
 948                  * WSAGetLastError() values are regular BSD error codes
 949                  * biased by WSABASEERR.
 950                  * However, strerror() does not know about networking
 951                  * specific errors, which are values beginning at 38 or so.
 952                  * Therefore, we choose to leave the biased error code
 953                  * in errno so that _if_ someone looks up the code somewhere,
 954                  * then it is at least the number that are usually listed.
 955                  */
 956                 errno = WSAGetLastError();
 957                 return -1;
 958         }
 959         /* convert into a file descriptor */
 960         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
 961                 closesocket(s);
 962                 return error("unable to make a socket file descriptor: %s",
 963                         strerror(errno));
 964         }
 965         return sockfd;
 966 }
 967
 968 #undef connect
 969 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
 970 {
 971         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
 972         return connect(s, sa, sz);
 973 }
 974
 975 #undef rename
 976 int mingw_rename(const char *pold, const char *pnew)
 977 {
 978         DWORD attrs, gle;
 979         int tries = 0;
 980         static const int delay[] = { 0, 1, 10, 20, 40 };
 981
 982         /*
 983          * Try native rename() first to get errno right.
 984          * It is based on MoveFile(), which cannot overwrite existing files.
 985          */
 986         if (!rename(pold, pnew))
 987                 return 0;
 988         if (errno != EEXIST)
 989                 return -1;
 990 repeat:
 991         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 992                 return 0;
 993         /* TODO: translate more errors */
 994         gle = GetLastError();
 995         if (gle == ERROR_ACCESS_DENIED &&
 996             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
 997                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
 998                         errno = EISDIR;
 999                         return -1;
1000                 }
1001                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1002                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1003                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1004                                 return 0;
1005                         gle = GetLastError();
1006                         /* revert file attributes on failure */
1007                         SetFileAttributes(pnew, attrs);
1008                 }
1009         }
1010         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1011                 /*
1012                  * We assume that some other process had the source or
1013                  * destination file open at the wrong moment and retry.
1014                  * In order to give the other process a higher chance to
1015                  * complete its operation, we give up our time slice now.
1016                  * If we have to retry again, we do sleep a bit.
1017                  */
1018                 Sleep(delay[tries]);
1019                 tries++;
1020                 goto repeat;
1021         }
1022         errno = EACCES;
1023         return -1;
1024 }
1025
1026 struct passwd *getpwuid(int uid)
1027 {
1028         static char user_name[100];
1029         static struct passwd p;
1030
1031         DWORD len = sizeof(user_name);
1032         if (!GetUserName(user_name, &len))
1033                 return NULL;
1034         p.pw_name = user_name;
1035         p.pw_gecos = "unknown";
1036         p.pw_dir = NULL;
1037         return &p;
1038 }
1039
1040 static HANDLE timer_event;
1041 static HANDLE timer_thread;
1042 static int timer_interval;
1043 static int one_shot;
1044 static sig_handler_t timer_fn = SIG_DFL;
1045
1046 /*
1047  * The timer works like this:
1048  * The thread, ticktack(), is a trivial routine that most of the time
1049  * only waits to receive the signal to terminate. The main thread tells
1050  * the thread to terminate by setting the timer_event to the signalled
1051  * state.
1052  * But ticktack() interrupts the wait state after the timer's interval
1053  * length to call the signal handler.
1054  */
1055
1056 static unsigned __stdcall ticktack(void *dummy)
1057 {
1058         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1059                 if (timer_fn == SIG_DFL)
1060                         die("Alarm");
1061                 if (timer_fn != SIG_IGN)
1062                         timer_fn(SIGALRM);
1063                 if (one_shot)
1064                         break;
1065         }
1066         return 0;
1067 }
1068
1069 static int start_timer_thread(void)
1070 {
1071         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1072         if (timer_event) {
1073                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1074                 if (!timer_thread )
1075                         return errno = ENOMEM,
1076                                 error("cannot start timer thread");
1077         } else
1078                 return errno = ENOMEM,
1079                         error("cannot allocate resources for timer");
1080         return 0;
1081 }
1082
1083 static void stop_timer_thread(void)
1084 {
1085         if (timer_event)
1086                 SetEvent(timer_event);  /* tell thread to terminate */
1087         if (timer_thread) {
1088                 int rc = WaitForSingleObject(timer_thread, 1000);
1089                 if (rc == WAIT_TIMEOUT)
1090                         error("timer thread did not terminate timely");
1091                 else if (rc != WAIT_OBJECT_0)
1092                         error("waiting for timer thread failed: %lu",
1093                               GetLastError());
1094                 CloseHandle(timer_thread);
1095         }
1096         if (timer_event)
1097                 CloseHandle(timer_event);
1098         timer_event = NULL;
1099         timer_thread = NULL;
1100 }
1101
1102 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1103 {
1104         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1105 }
1106
1107 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1108 {
1109         static const struct timeval zero;
1110         static int atexit_done;
1111
1112         if (out != NULL)
1113                 return errno = EINVAL,
1114                         error("setitimer param 3 != NULL not implemented");
1115         if (!is_timeval_eq(&in->it_interval, &zero) &&
1116             !is_timeval_eq(&in->it_interval, &in->it_value))
1117                 return errno = EINVAL,
1118                         error("setitimer: it_interval must be zero or eq it_value");
1119
1120         if (timer_thread)
1121                 stop_timer_thread();
1122
1123         if (is_timeval_eq(&in->it_value, &zero) &&
1124             is_timeval_eq(&in->it_interval, &zero))
1125                 return 0;
1126
1127         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1128         one_shot = is_timeval_eq(&in->it_interval, &zero);
1129         if (!atexit_done) {
1130                 atexit(stop_timer_thread);
1131                 atexit_done = 1;
1132         }
1133         return start_timer_thread();
1134 }
1135
1136 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1137 {
1138         if (sig != SIGALRM)
1139                 return errno = EINVAL,
1140                         error("sigaction only implemented for SIGALRM");
1141         if (out != NULL)
1142                 return errno = EINVAL,
1143                         error("sigaction: param 3 != NULL not implemented");
1144
1145         timer_fn = in->sa_handler;
1146         return 0;
1147 }
1148
1149 #undef signal
1150 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1151 {
1152         sig_handler_t old = timer_fn;
1153         if (sig != SIGALRM)
1154                 return signal(sig, handler);
1155         timer_fn = handler;
1156         return old;
1157 }
1158
1159 static const char *make_backslash_path(const char *path)
1160 {
1161         static char buf[PATH_MAX + 1];
1162         char *c;
1163
1164         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1165                 die("Too long path: %.*s", 60, path);
1166
1167         for (c = buf; *c; c++) {
1168                 if (*c == '/')
1169                         *c = '\\';
1170         }
1171         return buf;
1172 }
1173
1174 void mingw_open_html(const char *unixpath)
1175 {
1176         const char *htmlpath = make_backslash_path(unixpath);
1177         printf("Launching default browser to display HTML ...\n");
1178         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1179 }
1180
1181 int link(const char *oldpath, const char *newpath)
1182 {
1183         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1184         static T create_hard_link = NULL;
1185         if (!create_hard_link) {
1186                 create_hard_link = (T) GetProcAddress(
1187                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1188                 if (!create_hard_link)
1189                         create_hard_link = (T)-1;
1190         }
1191         if (create_hard_link == (T)-1) {
1192                 errno = ENOSYS;
1193                 return -1;
1194         }
1195         if (!create_hard_link(newpath, oldpath, NULL)) {
1196                 errno = err_win_to_posix(GetLastError());
1197                 return -1;
1198         }
1199         return 0;
1200 }
1201
1202 int symlink(const char *oldpath, const char *newpath)
1203 {
1204         typedef BOOL WINAPI (*symlink_fn)(const char*, const char*, DWORD);
1205         static symlink_fn create_symbolic_link = NULL;
1206         if (!create_symbolic_link) {
1207                 create_symbolic_link = (symlink_fn) GetProcAddress(
1208                                 GetModuleHandle("kernel32.dll"), "CreateSymbolicLinkA");
1209                 if (!create_symbolic_link)
1210                         create_symbolic_link = (symlink_fn)-1;
1211         }
1212         if (create_symbolic_link == (symlink_fn)-1) {
1213                 errno = ENOSYS;
1214                 return -1;
1215         }
1216
1217         if (!create_symbolic_link(newpath, oldpath, 0)) {
1218                 errno = err_win_to_posix(GetLastError());
1219                 return -1;
1220         }
1221         return 0;
1222 }
1223
1224 int readlink(const char *path, char *buf, size_t bufsiz)
1225 {
1226         HANDLE handle = CreateFile(path, GENERIC_READ,
1227                         FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
1228                         NULL, OPEN_EXISTING,
1229                         FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
1230                         NULL);
1231
1232         if (handle != INVALID_HANDLE_VALUE) {
1233                 unsigned char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
1234                 DWORD dummy = 0;
1235                 if (DeviceIoControl(handle, FSCTL_GET_REPARSE_POINT, NULL, 0, buffer,
1236                         MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &dummy, NULL)) {
1237                         REPARSE_DATA_BUFFER *b = (REPARSE_DATA_BUFFER *) buffer;
1238                         if (b->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
1239                                 int len = b->SymbolicLinkReparseBuffer.SubstituteNameLength / sizeof(wchar_t);
1240                                 int offset = b->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(wchar_t);
1241                                 snprintf(buf, bufsiz, "%*ls", len,  & b->SymbolicLinkReparseBuffer.PathBuffer[offset]);
1242                                 CloseHandle(handle);
1243                                 return len;
1244                         }
1245                 }
1246
1247                 CloseHandle(handle);
1248         }
1249
1250         errno = EINVAL;
1251         return -1;
1252 }
1253
1254 char *getpass(const char *prompt)
1255 {
1256         struct strbuf buf = STRBUF_INIT;
1257
1258         fputs(prompt, stderr);
1259         for (;;) {
1260                 char c = _getch();
1261                 if (c == '\r' || c == '\n')
1262                         break;
1263                 strbuf_addch(&buf, c);
1264         }
1265         fputs("\n", stderr);
1266         return strbuf_detach(&buf, NULL);
1267 }
1268
1269 #ifndef NO_MINGW_REPLACE_READDIR
1270 /* MinGW readdir implementation to avoid extra lstats for Git */
1271 struct mingw_DIR
1272 {
1273         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1274         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1275         long                    dd_handle;      /* _findnext handle */
1276         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1277         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1278 };
1279
1280 struct dirent *mingw_readdir(DIR *dir)
1281 {
1282         WIN32_FIND_DATAA buf;
1283         HANDLE handle;
1284         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1285
1286         if (!dir->dd_handle) {
1287                 errno = EBADF; /* No set_errno for mingw */
1288                 return NULL;
1289         }
1290
1291         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1292         {
1293                 DWORD lasterr;
1294                 handle = FindFirstFileA(dir->dd_name, &buf);
1295                 lasterr = GetLastError();
1296                 dir->dd_handle = (long)handle;
1297                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1298                         errno = err_win_to_posix(lasterr);
1299                         return NULL;
1300                 }
1301         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1302                 return NULL;
1303         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1304                 DWORD lasterr = GetLastError();
1305                 FindClose((HANDLE)dir->dd_handle);
1306                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1307                 /*
1308                  * POSIX says you shouldn't set errno when readdir can't
1309                  * find any more files; so, if another error we leave it set.
1310                  */
1311                 if (lasterr != ERROR_NO_MORE_FILES)
1312                         errno = err_win_to_posix(lasterr);
1313                 return NULL;
1314         }
1315
1316         /* We get here if `buf' contains valid data.  */
1317         strcpy(dir->dd_dir.d_name, buf.cFileName);
1318         ++dir->dd_stat;
1319
1320         /* Set file type, based on WIN32_FIND_DATA */
1321         mdir->dd_dir.d_type = 0;
1322         if ((buf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
1323                         (buf.dwReserved0 == IO_REPARSE_TAG_SYMLINK))
1324                 mdir->dd_dir.d_type |= DT_LNK;
1325         else if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1326                 mdir->dd_dir.d_type |= DT_DIR;
1327         else
1328                 mdir->dd_dir.d_type |= DT_REG;
1329
1330         return (struct dirent*)&dir->dd_dir;
1331 }
1332 #endif // !NO_MINGW_REPLACE_READDIR