compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../cache.h"
   6
   7 unsigned int _CRT_fmode = _O_BINARY;
   8
   9 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 static int make_hidden(const char *path)
 123 {
 124         DWORD attribs = GetFileAttributes(path);
 125         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 126                 return 0;
 127         errno = err_win_to_posix(GetLastError());
 128         return -1;
 129 }
 130
 131 void mingw_mark_as_git_dir(const char *dir)
 132 {
 133         if (hide_dotfiles != HIDE_DOTFILES_FALSE && make_hidden(dir))
 134                 warning("Failed to make '%s' hidden", dir);
 135 }
 136
 137 #undef mkdir
 138 int mingw_mkdir(const char *path, int mode)
 139 {
 140         int ret = mkdir(path);
 141         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 142                 /*
 143                  * In Windows a file or dir starting with a dot is not
 144                  * automatically hidden. So lets mark it as hidden when
 145                  * such a directory is created.
 146                  */
 147                 const char *start = basename((char*)path);
 148                 if (*start == '.')
 149                         return make_hidden(path);
 150         }
 151         return ret;
 152 }
 153
 154 #undef open
 155 int mingw_open (const char *filename, int oflags, ...)
 156 {
 157         va_list args;
 158         unsigned mode;
 159         int fd;
 160
 161         va_start(args, oflags);
 162         mode = va_arg(args, int);
 163         va_end(args);
 164
 165         if (!strcmp(filename, "/dev/null"))
 166                 filename = "nul";
 167
 168         fd = open(filename, oflags, mode);
 169
 170         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 171                 DWORD attrs = GetFileAttributes(filename);
 172                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 173                         errno = EISDIR;
 174         }
 175         if ((oflags & O_CREAT) && fd >= 0 &&
 176             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 177                 /*
 178                  * In Windows a file or dir starting with a dot is not
 179                  * automatically hidden. So lets mark it as hidden when
 180                  * such a file is created.
 181                  */
 182                 const char *start = basename((char*)filename);
 183                 if (*start == '.' && make_hidden(filename))
 184                         warning("Could not mark '%s' as hidden.", filename);
 185         }
 186         return fd;
 187 }
 188
 189 #undef write
 190 ssize_t mingw_write(int fd, const void *buf, size_t count)
 191 {
 192         /*
 193          * While write() calls to a file on a local disk are translated
 194          * into WriteFile() calls with a maximum size of 64KB on Windows
 195          * XP and 256KB on Vista, no such cap is placed on writes to
 196          * files over the network on Windows XP.  Unfortunately, there
 197          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 198          * bigger writes fail on Windows XP.
 199          * So we cap to a nice 31MB here to avoid write failures over
 200          * the net without changing the number of WriteFile() calls in
 201          * the local case.
 202          */
 203         return write(fd, buf, min(count, 31 * 1024 * 1024));
 204 }
 205
 206 #undef fopen
 207 FILE *mingw_fopen (const char *filename, const char *otype)
 208 {
 209         int hide = 0;
 210         FILE *file;
 211         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 212             basename((char*)filename)[0] == '.')
 213                 hide = access(filename, F_OK);
 214         if (!strcmp(filename, "/dev/null"))
 215                 filename = "nul";
 216         file = fopen(filename, otype);
 217         if (file && hide && make_hidden(filename))
 218                 warning("Could not mark '%s' as hidden.", filename);
 219         return file;
 220 }
 221
 222 #undef freopen
 223 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 224 {
 225         int hide = 0;
 226         FILE *file;
 227         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 228             basename((char*)filename)[0] == '.')
 229                 hide = access(filename, F_OK);
 230         if (filename && !strcmp(filename, "/dev/null"))
 231                 filename = "nul";
 232         file = freopen(filename, otype, stream);
 233         if (file && hide && make_hidden(filename))
 234                 warning("Could not mark '%s' as hidden.", filename);
 235         return file;
 236 }
 237
 238 /*
 239  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 240  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 241  */
 242 static inline long long filetime_to_hnsec(const FILETIME *ft)
 243 {
 244         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 245         /* Windows to Unix Epoch conversion */
 246         return winTime - 116444736000000000LL;
 247 }
 248
 249 static inline time_t filetime_to_time_t(const FILETIME *ft)
 250 {
 251         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 252 }
 253
 254 /* We keep the do_lstat code in a separate function to avoid recursion.
 255  * When a path ends with a slash, the stat will fail with ENOENT. In
 256  * this case, we strip the trailing slashes and stat again.
 257  */
 258 static int do_lstat(const char *file_name, struct stat *buf)
 259 {
 260         WIN32_FILE_ATTRIBUTE_DATA fdata;
 261
 262         if (!(errno = get_file_attr(file_name, &fdata))) {
 263                 buf->st_ino = 0;
 264                 buf->st_gid = 0;
 265                 buf->st_uid = 0;
 266                 buf->st_nlink = 1;
 267                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 268                 buf->st_size = fdata.nFileSizeLow |
 269                         (((off_t)fdata.nFileSizeHigh)<<32);
 270                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 271                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 272                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 273                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 274                 return 0;
 275         }
 276         return -1;
 277 }
 278
 279 /* We provide our own lstat/fstat functions, since the provided
 280  * lstat/fstat functions are so slow. These stat functions are
 281  * tailored for Git's usage (read: fast), and are not meant to be
 282  * complete. Note that Git stat()s are redirected to mingw_lstat()
 283  * too, since Windows doesn't really handle symlinks that well.
 284  */
 285 int mingw_lstat(const char *file_name, struct stat *buf)
 286 {
 287         int namelen;
 288         static char alt_name[PATH_MAX];
 289
 290         if (!do_lstat(file_name, buf))
 291                 return 0;
 292
 293         /* if file_name ended in a '/', Windows returned ENOENT;
 294          * try again without trailing slashes
 295          */
 296         if (errno != ENOENT)
 297                 return -1;
 298
 299         namelen = strlen(file_name);
 300         if (namelen && file_name[namelen-1] != '/')
 301                 return -1;
 302         while (namelen && file_name[namelen-1] == '/')
 303                 --namelen;
 304         if (!namelen || namelen >= PATH_MAX)
 305                 return -1;
 306
 307         memcpy(alt_name, file_name, namelen);
 308         alt_name[namelen] = 0;
 309         return do_lstat(alt_name, buf);
 310 }
 311
 312 #undef fstat
 313 int mingw_fstat(int fd, struct stat *buf)
 314 {
 315         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 316         BY_HANDLE_FILE_INFORMATION fdata;
 317
 318         if (fh == INVALID_HANDLE_VALUE) {
 319                 errno = EBADF;
 320                 return -1;
 321         }
 322         /* direct non-file handles to MS's fstat() */
 323         if (GetFileType(fh) != FILE_TYPE_DISK)
 324                 return _fstati64(fd, buf);
 325
 326         if (GetFileInformationByHandle(fh, &fdata)) {
 327                 buf->st_ino = 0;
 328                 buf->st_gid = 0;
 329                 buf->st_uid = 0;
 330                 buf->st_nlink = 1;
 331                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 332                 buf->st_size = fdata.nFileSizeLow |
 333                         (((off_t)fdata.nFileSizeHigh)<<32);
 334                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 335                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 336                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 337                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 338                 return 0;
 339         }
 340         errno = EBADF;
 341         return -1;
 342 }
 343
 344 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 345 {
 346         long long winTime = t * 10000000LL + 116444736000000000LL;
 347         ft->dwLowDateTime = winTime;
 348         ft->dwHighDateTime = winTime >> 32;
 349 }
 350
 351 int mingw_utime (const char *file_name, const struct utimbuf *times)
 352 {
 353         FILETIME mft, aft;
 354         int fh, rc;
 355
 356         /* must have write permission */
 357         DWORD attrs = GetFileAttributes(file_name);
 358         if (attrs != INVALID_FILE_ATTRIBUTES &&
 359             (attrs & FILE_ATTRIBUTE_READONLY)) {
 360                 /* ignore errors here; open() will report them */
 361                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 362         }
 363
 364         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 365                 rc = -1;
 366                 goto revert_attrs;
 367         }
 368
 369         time_t_to_filetime(times->modtime, &mft);
 370         time_t_to_filetime(times->actime, &aft);
 371         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 372                 errno = EINVAL;
 373                 rc = -1;
 374         } else
 375                 rc = 0;
 376         close(fh);
 377
 378 revert_attrs:
 379         if (attrs != INVALID_FILE_ATTRIBUTES &&
 380             (attrs & FILE_ATTRIBUTE_READONLY)) {
 381                 /* ignore errors again */
 382                 SetFileAttributes(file_name, attrs);
 383         }
 384         return rc;
 385 }
 386
 387 unsigned int sleep (unsigned int seconds)
 388 {
 389         Sleep(seconds*1000);
 390         return 0;
 391 }
 392
 393 int mkstemp(char *template)
 394 {
 395         char *filename = mktemp(template);
 396         if (filename == NULL)
 397                 return -1;
 398         return open(filename, O_RDWR | O_CREAT, 0600);
 399 }
 400
 401 int gettimeofday(struct timeval *tv, void *tz)
 402 {
 403         FILETIME ft;
 404         long long hnsec;
 405
 406         GetSystemTimeAsFileTime(&ft);
 407         hnsec = filetime_to_hnsec(&ft);
 408         tv->tv_sec = hnsec / 10000000;
 409         tv->tv_usec = (hnsec % 10000000) / 10;
 410         return 0;
 411 }
 412
 413 int pipe(int filedes[2])
 414 {
 415         HANDLE h[2];
 416
 417         /* this creates non-inheritable handles */
 418         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 419                 errno = err_win_to_posix(GetLastError());
 420                 return -1;
 421         }
 422         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 423         if (filedes[0] < 0) {
 424                 CloseHandle(h[0]);
 425                 CloseHandle(h[1]);
 426                 return -1;
 427         }
 428         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 429         if (filedes[0] < 0) {
 430                 close(filedes[0]);
 431                 CloseHandle(h[1]);
 432                 return -1;
 433         }
 434         return 0;
 435 }
 436
 437 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 438 {
 439         int i, pending;
 440
 441         if (timeout >= 0) {
 442                 if (nfds == 0) {
 443                         Sleep(timeout);
 444                         return 0;
 445                 }
 446                 return errno = EINVAL, error("poll timeout not supported");
 447         }
 448
 449         /* When there is only one fd to wait for, then we pretend that
 450          * input is available and let the actual wait happen when the
 451          * caller invokes read().
 452          */
 453         if (nfds == 1) {
 454                 if (!(ufds[0].events & POLLIN))
 455                         return errno = EINVAL, error("POLLIN not set");
 456                 ufds[0].revents = POLLIN;
 457                 return 0;
 458         }
 459
 460 repeat:
 461         pending = 0;
 462         for (i = 0; i < nfds; i++) {
 463                 DWORD avail = 0;
 464                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 465                 if (h == INVALID_HANDLE_VALUE)
 466                         return -1;      /* errno was set */
 467
 468                 if (!(ufds[i].events & POLLIN))
 469                         return errno = EINVAL, error("POLLIN not set");
 470
 471                 /* this emulation works only for pipes */
 472                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 473                         int err = GetLastError();
 474                         if (err == ERROR_BROKEN_PIPE) {
 475                                 ufds[i].revents = POLLHUP;
 476                                 pending++;
 477                         } else {
 478                                 errno = EINVAL;
 479                                 return error("PeekNamedPipe failed,"
 480                                         " GetLastError: %u", err);
 481                         }
 482                 } else if (avail) {
 483                         ufds[i].revents = POLLIN;
 484                         pending++;
 485                 } else
 486                         ufds[i].revents = 0;
 487         }
 488         if (!pending) {
 489                 /* The only times that we spin here is when the process
 490                  * that is connected through the pipes is waiting for
 491                  * its own input data to become available. But since
 492                  * the process (pack-objects) is itself CPU intensive,
 493                  * it will happily pick up the time slice that we are
 494                  * relinquishing here.
 495                  */
 496                 Sleep(0);
 497                 goto repeat;
 498         }
 499         return 0;
 500 }
 501
 502 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 503 {
 504         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 505         memcpy(result, gmtime(timep), sizeof(struct tm));
 506         return result;
 507 }
 508
 509 struct tm *localtime_r(const time_t *timep, struct tm *result)
 510 {
 511         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 512         memcpy(result, localtime(timep), sizeof(struct tm));
 513         return result;
 514 }
 515
 516 #undef getcwd
 517 char *mingw_getcwd(char *pointer, int len)
 518 {
 519         int i;
 520         char *ret = getcwd(pointer, len);
 521         if (!ret)
 522                 return ret;
 523         for (i = 0; pointer[i]; i++)
 524                 if (pointer[i] == '\\')
 525                         pointer[i] = '/';
 526         return ret;
 527 }
 528
 529 #undef getenv
 530 char *mingw_getenv(const char *name)
 531 {
 532         char *result = getenv(name);
 533         if (!result && !strcmp(name, "TMPDIR")) {
 534                 /* on Windows it is TMP and TEMP */
 535                 result = getenv("TMP");
 536                 if (!result)
 537                         result = getenv("TEMP");
 538         }
 539         return result;
 540 }
 541
 542 /*
 543  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 544  * (Parsing C++ Command-Line Arguments)
 545  */
 546 static const char *quote_arg(const char *arg)
 547 {
 548         /* count chars to quote */
 549         int len = 0, n = 0;
 550         int force_quotes = 0;
 551         char *q, *d;
 552         const char *p = arg;
 553         if (!*p) force_quotes = 1;
 554         while (*p) {
 555                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 556                         force_quotes = 1;
 557                 else if (*p == '"')
 558                         n++;
 559                 else if (*p == '\\') {
 560                         int count = 0;
 561                         while (*p == '\\') {
 562                                 count++;
 563                                 p++;
 564                                 len++;
 565                         }
 566                         if (*p == '"')
 567                                 n += count*2 + 1;
 568                         continue;
 569                 }
 570                 len++;
 571                 p++;
 572         }
 573         if (!force_quotes && n == 0)
 574                 return arg;
 575
 576         /* insert \ where necessary */
 577         d = q = xmalloc(len+n+3);
 578         *d++ = '"';
 579         while (*arg) {
 580                 if (*arg == '"')
 581                         *d++ = '\\';
 582                 else if (*arg == '\\') {
 583                         int count = 0;
 584                         while (*arg == '\\') {
 585                                 count++;
 586                                 *d++ = *arg++;
 587                         }
 588                         if (*arg == '"') {
 589                                 while (count-- > 0)
 590                                         *d++ = '\\';
 591                                 *d++ = '\\';
 592                         }
 593                 }
 594                 *d++ = *arg++;
 595         }
 596         *d++ = '"';
 597         *d++ = 0;
 598         return q;
 599 }
 600
 601 static const char *parse_interpreter(const char *cmd)
 602 {
 603         static char buf[100];
 604         char *p, *opt;
 605         int n, fd;
 606
 607         /* don't even try a .exe */
 608         n = strlen(cmd);
 609         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 610                 return NULL;
 611
 612         fd = open(cmd, O_RDONLY);
 613         if (fd < 0)
 614                 return NULL;
 615         n = read(fd, buf, sizeof(buf)-1);
 616         close(fd);
 617         if (n < 4)      /* at least '#!/x' and not error */
 618                 return NULL;
 619
 620         if (buf[0] != '#' || buf[1] != '!')
 621                 return NULL;
 622         buf[n] = '\0';
 623         p = buf + strcspn(buf, "\r\n");
 624         if (!*p)
 625                 return NULL;
 626
 627         *p = '\0';
 628         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 629                 return NULL;
 630         /* strip options */
 631         if ((opt = strchr(p+1, ' ')))
 632                 *opt = '\0';
 633         return p+1;
 634 }
 635
 636 /*
 637  * Splits the PATH into parts.
 638  */
 639 static char **get_path_split(void)
 640 {
 641         char *p, **path, *envpath = getenv("PATH");
 642         int i, n = 0;
 643
 644         if (!envpath || !*envpath)
 645                 return NULL;
 646
 647         envpath = xstrdup(envpath);
 648         p = envpath;
 649         while (p) {
 650                 char *dir = p;
 651                 p = strchr(p, ';');
 652                 if (p) *p++ = '\0';
 653                 if (*dir) {     /* not earlier, catches series of ; */
 654                         ++n;
 655                 }
 656         }
 657         if (!n)
 658                 return NULL;
 659
 660         path = xmalloc((n+1)*sizeof(char *));
 661         p = envpath;
 662         i = 0;
 663         do {
 664                 if (*p)
 665                         path[i++] = xstrdup(p);
 666                 p = p+strlen(p)+1;
 667         } while (i < n);
 668         path[i] = NULL;
 669
 670         free(envpath);
 671
 672         return path;
 673 }
 674
 675 static void free_path_split(char **path)
 676 {
 677         char **p = path;
 678
 679         if (!path)
 680                 return;
 681
 682         while (*p)
 683                 free(*p++);
 684         free(path);
 685 }
 686
 687 /*
 688  * exe_only means that we only want to detect .exe files, but not scripts
 689  * (which do not have an extension)
 690  */
 691 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 692 {
 693         char path[MAX_PATH];
 694         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 695
 696         if (!isexe && access(path, F_OK) == 0)
 697                 return xstrdup(path);
 698         path[strlen(path)-4] = '\0';
 699         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 700                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 701                         return xstrdup(path);
 702         return NULL;
 703 }
 704
 705 /*
 706  * Determines the absolute path of cmd using the the split path in path.
 707  * If cmd contains a slash or backslash, no lookup is performed.
 708  */
 709 static char *path_lookup(const char *cmd, char **path, int exe_only)
 710 {
 711         char *prog = NULL;
 712         int len = strlen(cmd);
 713         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 714
 715         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 716                 prog = xstrdup(cmd);
 717
 718         while (!prog && *path)
 719                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 720
 721         return prog;
 722 }
 723
 724 static int env_compare(const void *a, const void *b)
 725 {
 726         char *const *ea = a;
 727         char *const *eb = b;
 728         return strcasecmp(*ea, *eb);
 729 }
 730
 731 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 732                               const char *dir,
 733                               int prepend_cmd, int fhin, int fhout, int fherr)
 734 {
 735         STARTUPINFO si;
 736         PROCESS_INFORMATION pi;
 737         struct strbuf envblk, args;
 738         unsigned flags;
 739         BOOL ret;
 740
 741         /* Determine whether or not we are associated to a console */
 742         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 743                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 744                         FILE_ATTRIBUTE_NORMAL, NULL);
 745         if (cons == INVALID_HANDLE_VALUE) {
 746                 /* There is no console associated with this process.
 747                  * Since the child is a console process, Windows
 748                  * would normally create a console window. But
 749                  * since we'll be redirecting std streams, we do
 750                  * not need the console.
 751                  * It is necessary to use DETACHED_PROCESS
 752                  * instead of CREATE_NO_WINDOW to make ssh
 753                  * recognize that it has no console.
 754                  */
 755                 flags = DETACHED_PROCESS;
 756         } else {
 757                 /* There is already a console. If we specified
 758                  * DETACHED_PROCESS here, too, Windows would
 759                  * disassociate the child from the console.
 760                  * The same is true for CREATE_NO_WINDOW.
 761                  * Go figure!
 762                  */
 763                 flags = 0;
 764                 CloseHandle(cons);
 765         }
 766         memset(&si, 0, sizeof(si));
 767         si.cb = sizeof(si);
 768         si.dwFlags = STARTF_USESTDHANDLES;
 769         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 770         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 771         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 772
 773         /* concatenate argv, quoting args as we go */
 774         strbuf_init(&args, 0);
 775         if (prepend_cmd) {
 776                 char *quoted = (char *)quote_arg(cmd);
 777                 strbuf_addstr(&args, quoted);
 778                 if (quoted != cmd)
 779                         free(quoted);
 780         }
 781         for (; *argv; argv++) {
 782                 char *quoted = (char *)quote_arg(*argv);
 783                 if (*args.buf)
 784                         strbuf_addch(&args, ' ');
 785                 strbuf_addstr(&args, quoted);
 786                 if (quoted != *argv)
 787                         free(quoted);
 788         }
 789
 790         if (env) {
 791                 int count = 0;
 792                 char **e, **sorted_env;
 793
 794                 for (e = env; *e; e++)
 795                         count++;
 796
 797                 /* environment must be sorted */
 798                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 799                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 800                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 801
 802                 strbuf_init(&envblk, 0);
 803                 for (e = sorted_env; *e; e++) {
 804                         strbuf_addstr(&envblk, *e);
 805                         strbuf_addch(&envblk, '\0');
 806                 }
 807                 free(sorted_env);
 808         }
 809
 810         memset(&pi, 0, sizeof(pi));
 811         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 812                 env ? envblk.buf : NULL, dir, &si, &pi);
 813
 814         if (env)
 815                 strbuf_release(&envblk);
 816         strbuf_release(&args);
 817
 818         if (!ret) {
 819                 errno = ENOENT;
 820                 return -1;
 821         }
 822         CloseHandle(pi.hThread);
 823         return (pid_t)pi.hProcess;
 824 }
 825
 826 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 827                            int prepend_cmd)
 828 {
 829         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 830 }
 831
 832 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 833                      const char *dir,
 834                      int fhin, int fhout, int fherr)
 835 {
 836         pid_t pid;
 837         char **path = get_path_split();
 838         char *prog = path_lookup(cmd, path, 0);
 839
 840         if (!prog) {
 841                 errno = ENOENT;
 842                 pid = -1;
 843         }
 844         else {
 845                 const char *interpr = parse_interpreter(prog);
 846
 847                 if (interpr) {
 848                         const char *argv0 = argv[0];
 849                         char *iprog = path_lookup(interpr, path, 1);
 850                         argv[0] = prog;
 851                         if (!iprog) {
 852                                 errno = ENOENT;
 853                                 pid = -1;
 854                         }
 855                         else {
 856                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 857                                                        fhin, fhout, fherr);
 858                                 free(iprog);
 859                         }
 860                         argv[0] = argv0;
 861                 }
 862                 else
 863                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 864                                                fhin, fhout, fherr);
 865                 free(prog);
 866         }
 867         free_path_split(path);
 868         return pid;
 869 }
 870
 871 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 872 {
 873         const char *interpr = parse_interpreter(cmd);
 874         char **path;
 875         char *prog;
 876         int pid = 0;
 877
 878         if (!interpr)
 879                 return 0;
 880         path = get_path_split();
 881         prog = path_lookup(interpr, path, 1);
 882         if (prog) {
 883                 int argc = 0;
 884                 const char **argv2;
 885                 while (argv[argc]) argc++;
 886                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 887                 argv2[0] = (char *)cmd; /* full path to the script file */
 888                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 889                 pid = mingw_spawnve(prog, argv2, env, 1);
 890                 if (pid >= 0) {
 891                         int status;
 892                         if (waitpid(pid, &status, 0) < 0)
 893                                 status = 255;
 894                         exit(status);
 895                 }
 896                 pid = 1;        /* indicate that we tried but failed */
 897                 free(prog);
 898                 free(argv2);
 899         }
 900         free_path_split(path);
 901         return pid;
 902 }
 903
 904 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 905 {
 906         /* check if git_command is a shell script */
 907         if (!try_shell_exec(cmd, argv, (char **)env)) {
 908                 int pid, status;
 909
 910                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 911                 if (pid < 0)
 912                         return;
 913                 if (waitpid(pid, &status, 0) < 0)
 914                         status = 255;
 915                 exit(status);
 916         }
 917 }
 918
 919 void mingw_execvp(const char *cmd, char *const *argv)
 920 {
 921         char **path = get_path_split();
 922         char *prog = path_lookup(cmd, path, 0);
 923
 924         if (prog) {
 925                 mingw_execve(prog, argv, environ);
 926                 free(prog);
 927         } else
 928                 errno = ENOENT;
 929
 930         free_path_split(path);
 931 }
 932
 933 static char **copy_environ(void)
 934 {
 935         char **env;
 936         int i = 0;
 937         while (environ[i])
 938                 i++;
 939         env = xmalloc((i+1)*sizeof(*env));
 940         for (i = 0; environ[i]; i++)
 941                 env[i] = xstrdup(environ[i]);
 942         env[i] = NULL;
 943         return env;
 944 }
 945
 946 void free_environ(char **env)
 947 {
 948         int i;
 949         for (i = 0; env[i]; i++)
 950                 free(env[i]);
 951         free(env);
 952 }
 953
 954 static int lookup_env(char **env, const char *name, size_t nmln)
 955 {
 956         int i;
 957
 958         for (i = 0; env[i]; i++) {
 959                 if (0 == strncmp(env[i], name, nmln)
 960                     && '=' == env[i][nmln])
 961                         /* matches */
 962                         return i;
 963         }
 964         return -1;
 965 }
 966
 967 /*
 968  * If name contains '=', then sets the variable, otherwise it unsets it
 969  */
 970 static char **env_setenv(char **env, const char *name)
 971 {
 972         char *eq = strchrnul(name, '=');
 973         int i = lookup_env(env, name, eq-name);
 974
 975         if (i < 0) {
 976                 if (*eq) {
 977                         for (i = 0; env[i]; i++)
 978                                 ;
 979                         env = xrealloc(env, (i+2)*sizeof(*env));
 980                         env[i] = xstrdup(name);
 981                         env[i+1] = NULL;
 982                 }
 983         }
 984         else {
 985                 free(env[i]);
 986                 if (*eq)
 987                         env[i] = xstrdup(name);
 988                 else
 989                         for (; env[i]; i++)
 990                                 env[i] = env[i+1];
 991         }
 992         return env;
 993 }
 994
 995 /*
 996  * Copies global environ and adjusts variables as specified by vars.
 997  */
 998 char **make_augmented_environ(const char *const *vars)
 999 {
1000         char **env = copy_environ();
1001
1002         while (*vars)
1003                 env = env_setenv(env, *vars++);
1004         return env;
1005 }
1006
1007 /*
1008  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1009  * that service contains a numerical port, or that it it is null. It
1010  * does a simple search using gethostbyname, and returns one IPv4 host
1011  * if one was found.
1012  */
1013 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1014                                    const struct addrinfo *hints,
1015                                    struct addrinfo **res)
1016 {
1017         struct hostent *h = gethostbyname(node);
1018         struct addrinfo *ai;
1019         struct sockaddr_in *sin;
1020
1021         if (!h)
1022                 return WSAGetLastError();
1023
1024         ai = xmalloc(sizeof(struct addrinfo));
1025         *res = ai;
1026         ai->ai_flags = 0;
1027         ai->ai_family = AF_INET;
1028         ai->ai_socktype = hints->ai_socktype;
1029         switch (hints->ai_socktype) {
1030         case SOCK_STREAM:
1031                 ai->ai_protocol = IPPROTO_TCP;
1032                 break;
1033         case SOCK_DGRAM:
1034                 ai->ai_protocol = IPPROTO_UDP;
1035                 break;
1036         default:
1037                 ai->ai_protocol = 0;
1038                 break;
1039         }
1040         ai->ai_addrlen = sizeof(struct sockaddr_in);
1041         ai->ai_canonname = strdup(h->h_name);
1042
1043         sin = xmalloc(ai->ai_addrlen);
1044         memset(sin, 0, ai->ai_addrlen);
1045         sin->sin_family = AF_INET;
1046         if (service)
1047                 sin->sin_port = htons(atoi(service));
1048         sin->sin_addr = *(struct in_addr *)h->h_addr;
1049         ai->ai_addr = (struct sockaddr *)sin;
1050         ai->ai_next = 0;
1051         return 0;
1052 }
1053
1054 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1055 {
1056         free(res->ai_canonname);
1057         free(res->ai_addr);
1058         free(res);
1059 }
1060
1061 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1062                                    char *host, DWORD hostlen,
1063                                    char *serv, DWORD servlen, int flags)
1064 {
1065         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1066         if (sa->sa_family != AF_INET)
1067                 return EAI_FAMILY;
1068         if (!host && !serv)
1069                 return EAI_NONAME;
1070
1071         if (host && hostlen > 0) {
1072                 struct hostent *ent = NULL;
1073                 if (!(flags & NI_NUMERICHOST))
1074                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1075                                             sizeof(sin->sin_addr), AF_INET);
1076
1077                 if (ent)
1078                         snprintf(host, hostlen, "%s", ent->h_name);
1079                 else if (flags & NI_NAMEREQD)
1080                         return EAI_NONAME;
1081                 else
1082                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1083         }
1084
1085         if (serv && servlen > 0) {
1086                 struct servent *ent = NULL;
1087                 if (!(flags & NI_NUMERICSERV))
1088                         ent = getservbyport(sin->sin_port,
1089                                             flags & NI_DGRAM ? "udp" : "tcp");
1090
1091                 if (ent)
1092                         snprintf(serv, servlen, "%s", ent->s_name);
1093                 else
1094                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1095         }
1096
1097         return 0;
1098 }
1099
1100 static HMODULE ipv6_dll = NULL;
1101 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1102 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1103                                       const struct addrinfo *hints,
1104                                       struct addrinfo **res);
1105 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1106                                       char *host, DWORD hostlen,
1107                                       char *serv, DWORD servlen, int flags);
1108 /*
1109  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1110  * don't need to try to load that one dynamically.
1111  */
1112
1113 static void socket_cleanup(void)
1114 {
1115         WSACleanup();
1116         if (ipv6_dll)
1117                 FreeLibrary(ipv6_dll);
1118         ipv6_dll = NULL;
1119         ipv6_freeaddrinfo = freeaddrinfo_stub;
1120         ipv6_getaddrinfo = getaddrinfo_stub;
1121         ipv6_getnameinfo = getnameinfo_stub;
1122 }
1123
1124 static void ensure_socket_initialization(void)
1125 {
1126         WSADATA wsa;
1127         static int initialized = 0;
1128         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1129         const char **name;
1130
1131         if (initialized)
1132                 return;
1133
1134         if (WSAStartup(MAKEWORD(2,2), &wsa))
1135                 die("unable to initialize winsock subsystem, error %d",
1136                         WSAGetLastError());
1137
1138         for (name = libraries; *name; name++) {
1139                 ipv6_dll = LoadLibrary(*name);
1140                 if (!ipv6_dll)
1141                         continue;
1142
1143                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1144                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1145                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1146                                                    const struct addrinfo *,
1147                                                    struct addrinfo **))
1148                         GetProcAddress(ipv6_dll, "getaddrinfo");
1149                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1150                                                    socklen_t, char *, DWORD,
1151                                                    char *, DWORD, int))
1152                         GetProcAddress(ipv6_dll, "getnameinfo");
1153                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1154                         FreeLibrary(ipv6_dll);
1155                         ipv6_dll = NULL;
1156                 } else
1157                         break;
1158         }
1159         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1160                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1161                 ipv6_getaddrinfo = getaddrinfo_stub;
1162                 ipv6_getnameinfo = getnameinfo_stub;
1163         }
1164
1165         atexit(socket_cleanup);
1166         initialized = 1;
1167 }
1168
1169 #undef gethostbyname
1170 struct hostent *mingw_gethostbyname(const char *host)
1171 {
1172         ensure_socket_initialization();
1173         return gethostbyname(host);
1174 }
1175
1176 void mingw_freeaddrinfo(struct addrinfo *res)
1177 {
1178         ipv6_freeaddrinfo(res);
1179 }
1180
1181 int mingw_getaddrinfo(const char *node, const char *service,
1182                       const struct addrinfo *hints, struct addrinfo **res)
1183 {
1184         ensure_socket_initialization();
1185         return ipv6_getaddrinfo(node, service, hints, res);
1186 }
1187
1188 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1189                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1190                       int flags)
1191 {
1192         ensure_socket_initialization();
1193         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1194 }
1195
1196 int mingw_socket(int domain, int type, int protocol)
1197 {
1198         int sockfd;
1199         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1200         if (s == INVALID_SOCKET) {
1201                 /*
1202                  * WSAGetLastError() values are regular BSD error codes
1203                  * biased by WSABASEERR.
1204                  * However, strerror() does not know about networking
1205                  * specific errors, which are values beginning at 38 or so.
1206                  * Therefore, we choose to leave the biased error code
1207                  * in errno so that _if_ someone looks up the code somewhere,
1208                  * then it is at least the number that are usually listed.
1209                  */
1210                 errno = WSAGetLastError();
1211                 return -1;
1212         }
1213         /* convert into a file descriptor */
1214         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1215                 closesocket(s);
1216                 return error("unable to make a socket file descriptor: %s",
1217                         strerror(errno));
1218         }
1219         return sockfd;
1220 }
1221
1222 #undef connect
1223 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1224 {
1225         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1226         return connect(s, sa, sz);
1227 }
1228
1229 #undef rename
1230 int mingw_rename(const char *pold, const char *pnew)
1231 {
1232         DWORD attrs, gle;
1233         int tries = 0;
1234         static const int delay[] = { 0, 1, 10, 20, 40 };
1235
1236         /*
1237          * Try native rename() first to get errno right.
1238          * It is based on MoveFile(), which cannot overwrite existing files.
1239          */
1240         if (!rename(pold, pnew))
1241                 return 0;
1242         if (errno != EEXIST)
1243                 return -1;
1244 repeat:
1245         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1246                 return 0;
1247         /* TODO: translate more errors */
1248         gle = GetLastError();
1249         if (gle == ERROR_ACCESS_DENIED &&
1250             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1251                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1252                         errno = EISDIR;
1253                         return -1;
1254                 }
1255                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1256                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1257                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1258                                 return 0;
1259                         gle = GetLastError();
1260                         /* revert file attributes on failure */
1261                         SetFileAttributes(pnew, attrs);
1262                 }
1263         }
1264         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1265                 /*
1266                  * We assume that some other process had the source or
1267                  * destination file open at the wrong moment and retry.
1268                  * In order to give the other process a higher chance to
1269                  * complete its operation, we give up our time slice now.
1270                  * If we have to retry again, we do sleep a bit.
1271                  */
1272                 Sleep(delay[tries]);
1273                 tries++;
1274                 goto repeat;
1275         }
1276         errno = EACCES;
1277         return -1;
1278 }
1279
1280 /*
1281  * Note that this doesn't return the actual pagesize, but
1282  * the allocation granularity. If future Windows specific git code
1283  * needs the real getpagesize function, we need to find another solution.
1284  */
1285 int mingw_getpagesize(void)
1286 {
1287         SYSTEM_INFO si;
1288         GetSystemInfo(&si);
1289         return si.dwAllocationGranularity;
1290 }
1291
1292 struct passwd *getpwuid(int uid)
1293 {
1294         static char user_name[100];
1295         static struct passwd p;
1296
1297         DWORD len = sizeof(user_name);
1298         if (!GetUserName(user_name, &len))
1299                 return NULL;
1300         p.pw_name = user_name;
1301         p.pw_gecos = "unknown";
1302         p.pw_dir = NULL;
1303         return &p;
1304 }
1305
1306 static HANDLE timer_event;
1307 static HANDLE timer_thread;
1308 static int timer_interval;
1309 static int one_shot;
1310 static sig_handler_t timer_fn = SIG_DFL;
1311
1312 /* The timer works like this:
1313  * The thread, ticktack(), is a trivial routine that most of the time
1314  * only waits to receive the signal to terminate. The main thread tells
1315  * the thread to terminate by setting the timer_event to the signalled
1316  * state.
1317  * But ticktack() interrupts the wait state after the timer's interval
1318  * length to call the signal handler.
1319  */
1320
1321 static unsigned __stdcall ticktack(void *dummy)
1322 {
1323         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1324                 if (timer_fn == SIG_DFL)
1325                         die("Alarm");
1326                 if (timer_fn != SIG_IGN)
1327                         timer_fn(SIGALRM);
1328                 if (one_shot)
1329                         break;
1330         }
1331         return 0;
1332 }
1333
1334 static int start_timer_thread(void)
1335 {
1336         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1337         if (timer_event) {
1338                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1339                 if (!timer_thread )
1340                         return errno = ENOMEM,
1341                                 error("cannot start timer thread");
1342         } else
1343                 return errno = ENOMEM,
1344                         error("cannot allocate resources for timer");
1345         return 0;
1346 }
1347
1348 static void stop_timer_thread(void)
1349 {
1350         if (timer_event)
1351                 SetEvent(timer_event);  /* tell thread to terminate */
1352         if (timer_thread) {
1353                 int rc = WaitForSingleObject(timer_thread, 1000);
1354                 if (rc == WAIT_TIMEOUT)
1355                         error("timer thread did not terminate timely");
1356                 else if (rc != WAIT_OBJECT_0)
1357                         error("waiting for timer thread failed: %lu",
1358                               GetLastError());
1359                 CloseHandle(timer_thread);
1360         }
1361         if (timer_event)
1362                 CloseHandle(timer_event);
1363         timer_event = NULL;
1364         timer_thread = NULL;
1365 }
1366
1367 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1368 {
1369         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1370 }
1371
1372 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1373 {
1374         static const struct timeval zero;
1375         static int atexit_done;
1376
1377         if (out != NULL)
1378                 return errno = EINVAL,
1379                         error("setitimer param 3 != NULL not implemented");
1380         if (!is_timeval_eq(&in->it_interval, &zero) &&
1381             !is_timeval_eq(&in->it_interval, &in->it_value))
1382                 return errno = EINVAL,
1383                         error("setitimer: it_interval must be zero or eq it_value");
1384
1385         if (timer_thread)
1386                 stop_timer_thread();
1387
1388         if (is_timeval_eq(&in->it_value, &zero) &&
1389             is_timeval_eq(&in->it_interval, &zero))
1390                 return 0;
1391
1392         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1393         one_shot = is_timeval_eq(&in->it_interval, &zero);
1394         if (!atexit_done) {
1395                 atexit(stop_timer_thread);
1396                 atexit_done = 1;
1397         }
1398         return start_timer_thread();
1399 }
1400
1401 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1402 {
1403         if (sig != SIGALRM)
1404                 return errno = EINVAL,
1405                         error("sigaction only implemented for SIGALRM");
1406         if (out != NULL)
1407                 return errno = EINVAL,
1408                         error("sigaction: param 3 != NULL not implemented");
1409
1410         timer_fn = in->sa_handler;
1411         return 0;
1412 }
1413
1414 #undef signal
1415 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1416 {
1417         sig_handler_t old = timer_fn;
1418         if (sig != SIGALRM)
1419                 return signal(sig, handler);
1420         timer_fn = handler;
1421         return old;
1422 }
1423
1424 static const char *make_backslash_path(const char *path)
1425 {
1426         static char buf[PATH_MAX + 1];
1427         char *c;
1428
1429         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1430                 die("Too long path: %.*s", 60, path);
1431
1432         for (c = buf; *c; c++) {
1433                 if (*c == '/')
1434                         *c = '\\';
1435         }
1436         return buf;
1437 }
1438
1439 void mingw_open_html(const char *unixpath)
1440 {
1441         const char *htmlpath = make_backslash_path(unixpath);
1442         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1443                         const char *, const char *, const char *, INT);
1444         T ShellExecute;
1445         HMODULE shell32;
1446
1447         shell32 = LoadLibrary("shell32.dll");
1448         if (!shell32)
1449                 die("cannot load shell32.dll");
1450         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1451         if (!ShellExecute)
1452                 die("cannot run browser");
1453
1454         printf("Launching default browser to display HTML ...\n");
1455         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1456
1457         FreeLibrary(shell32);
1458 }
1459
1460 int link(const char *oldpath, const char *newpath)
1461 {
1462         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1463         static T create_hard_link = NULL;
1464         if (!create_hard_link) {
1465                 create_hard_link = (T) GetProcAddress(
1466                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1467                 if (!create_hard_link)
1468                         create_hard_link = (T)-1;
1469         }
1470         if (create_hard_link == (T)-1) {
1471                 errno = ENOSYS;
1472                 return -1;
1473         }
1474         if (!create_hard_link(newpath, oldpath, NULL)) {
1475                 errno = err_win_to_posix(GetLastError());
1476                 return -1;
1477         }
1478         return 0;
1479 }
1480
1481 char *getpass(const char *prompt)
1482 {
1483         struct strbuf buf = STRBUF_INIT;
1484
1485         fputs(prompt, stderr);
1486         for (;;) {
1487                 char c = _getch();
1488                 if (c == '\r' || c == '\n')
1489                         break;
1490                 strbuf_addch(&buf, c);
1491         }
1492         fputs("\n", stderr);
1493         return strbuf_detach(&buf, NULL);
1494 }
1495
1496 #ifndef NO_MINGW_REPLACE_READDIR
1497 /* MinGW readdir implementation to avoid extra lstats for Git */
1498 struct mingw_DIR
1499 {
1500         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1501         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1502         long                    dd_handle;      /* _findnext handle */
1503         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1504         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1505 };
1506
1507 struct dirent *mingw_readdir(DIR *dir)
1508 {
1509         WIN32_FIND_DATAA buf;
1510         HANDLE handle;
1511         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1512
1513         if (!dir->dd_handle) {
1514                 errno = EBADF; /* No set_errno for mingw */
1515                 return NULL;
1516         }
1517
1518         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1519         {
1520                 DWORD lasterr;
1521                 handle = FindFirstFileA(dir->dd_name, &buf);
1522                 lasterr = GetLastError();
1523                 dir->dd_handle = (long)handle;
1524                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1525                         errno = err_win_to_posix(lasterr);
1526                         return NULL;
1527                 }
1528         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1529                 return NULL;
1530         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1531                 DWORD lasterr = GetLastError();
1532                 FindClose((HANDLE)dir->dd_handle);
1533                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1534                 /* POSIX says you shouldn't set errno when readdir can't
1535                    find any more files; so, if another error we leave it set. */
1536                 if (lasterr != ERROR_NO_MORE_FILES)
1537                         errno = err_win_to_posix(lasterr);
1538                 return NULL;
1539         }
1540
1541         /* We get here if `buf' contains valid data.  */
1542         strcpy(dir->dd_dir.d_name, buf.cFileName);
1543         ++dir->dd_stat;
1544
1545         /* Set file type, based on WIN32_FIND_DATA */
1546         mdir->dd_dir.d_type = 0;
1547         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1548                 mdir->dd_dir.d_type |= DT_DIR;
1549         else
1550                 mdir->dd_dir.d_type |= DT_REG;
1551
1552         return (struct dirent*)&dir->dd_dir;
1553 }
1554 #endif // !NO_MINGW_REPLACE_READDIR