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 static const int delay[] = { 0, 1, 10, 20, 40 };
   9
  10 int err_win_to_posix(DWORD winerr)
  11 {
  12         int error = ENOSYS;
  13         switch(winerr) {
  14         case ERROR_ACCESS_DENIED: error = EACCES; break;
  15         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  16         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  17         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  18         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  19         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  20         case ERROR_BAD_COMMAND: error = EIO; break;
  21         case ERROR_BAD_DEVICE: error = ENODEV; break;
  22         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  23         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  24         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  25         case ERROR_BAD_LENGTH: error = EINVAL; break;
  26         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  27         case ERROR_BAD_PIPE: error = EPIPE; break;
  28         case ERROR_BAD_UNIT: error = ENODEV; break;
  29         case ERROR_BAD_USERNAME: error = EINVAL; break;
  30         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  31         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  32         case ERROR_BUSY: error = EBUSY; break;
  33         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  34         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  35         case ERROR_CANNOT_MAKE: error = EACCES; break;
  36         case ERROR_CANTOPEN: error = EIO; break;
  37         case ERROR_CANTREAD: error = EIO; break;
  38         case ERROR_CANTWRITE: error = EIO; break;
  39         case ERROR_CRC: error = EIO; break;
  40         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  41         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  42         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  43         case ERROR_DIRECTORY: error = EINVAL; break;
  44         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  45         case ERROR_DISK_CHANGE: error = EIO; break;
  46         case ERROR_DISK_FULL: error = ENOSPC; break;
  47         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  48         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  49         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  50         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  51         case ERROR_FILE_EXISTS: error = EEXIST; break;
  52         case ERROR_FILE_INVALID: error = ENODEV; break;
  53         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  54         case ERROR_GEN_FAILURE: error = EIO; break;
  55         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  56         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  57         case ERROR_INVALID_ACCESS: error = EACCES; break;
  58         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  59         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  60         case ERROR_INVALID_DATA: error = EINVAL; break;
  61         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  62         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  63         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  64         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  65         case ERROR_INVALID_HANDLE: error = EBADF; break;
  66         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  67         case ERROR_INVALID_NAME: error = EINVAL; break;
  68         case ERROR_INVALID_OWNER: error = EINVAL; break;
  69         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  70         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  71         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  72         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  73         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  74         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  75         case ERROR_IO_DEVICE: error = EIO; break;
  76         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  77         case ERROR_LOCKED: error = EBUSY; break;
  78         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  79         case ERROR_LOGON_FAILURE: error = EACCES; break;
  80         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  81         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  82         case ERROR_MORE_DATA: error = EPIPE; break;
  83         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  84         case ERROR_NOACCESS: error = EFAULT; break;
  85         case ERROR_NONE_MAPPED: error = EINVAL; break;
  86         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  87         case ERROR_NOT_READY: error = EAGAIN; break;
  88         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  89         case ERROR_NO_DATA: error = EPIPE; break;
  90         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  91         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  92         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  93         case ERROR_OPEN_FAILED: error = EIO; break;
  94         case ERROR_OPEN_FILES: error = EBUSY; break;
  95         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  96         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  97         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  98         case ERROR_PATH_BUSY: error = EBUSY; break;
  99         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 100         case ERROR_PIPE_BUSY: error = EBUSY; break;
 101         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 102         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 103         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 104         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 105         case ERROR_READ_FAULT: error = EIO; break;
 106         case ERROR_SEEK: error = EIO; break;
 107         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 108         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 109         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 110         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 111         case ERROR_SWAPERROR: error = ENOENT; break;
 112         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 113         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 114         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 115         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 116         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 117         case ERROR_WRITE_FAULT: error = EIO; break;
 118         case ERROR_WRITE_PROTECT: error = EROFS; break;
 119         }
 120         return error;
 121 }
 122
 123 static int make_hidden(const char *path)
 124 {
 125         DWORD attribs = GetFileAttributes(path);
 126         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 127                 return 0;
 128         errno = err_win_to_posix(GetLastError());
 129         return -1;
 130 }
 131
 132 void mingw_mark_as_git_dir(const char *dir)
 133 {
 134         if (hide_dotfiles != HIDE_DOTFILES_FALSE && make_hidden(dir))
 135                 warning("Failed to make '%s' hidden", dir);
 136         git_config_set("core.hideDotFiles",
 137                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 138                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 139                  "dotGitOnly" : "true"));
 140 }
 141
 142 #undef mkdir
 143 int mingw_mkdir(const char *path, int mode)
 144 {
 145         int ret = mkdir(path);
 146         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 147                 /*
 148                  * In Windows a file or dir starting with a dot is not
 149                  * automatically hidden. So lets mark it as hidden when
 150                  * such a directory is created.
 151                  */
 152                 const char *start = basename((char*)path);
 153                 if (*start == '.')
 154                         return make_hidden(path);
 155         }
 156         return ret;
 157 }
 158
 159 #undef unlink
 160 int mingw_unlink(const char *pathname)
 161 {
 162         int ret, tries = 0;
 163
 164         /* read-only files cannot be removed */
 165         chmod(pathname, 0666);
 166         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 167                 if (errno != EACCES)
 168                         break;
 169                 /*
 170                  * We assume that some other process had the source or
 171                  * destination file open at the wrong moment and retry.
 172                  * In order to give the other process a higher chance to
 173                  * complete its operation, we give up our time slice now.
 174                  * If we have to retry again, we do sleep a bit.
 175                  */
 176                 Sleep(delay[tries]);
 177                 tries++;
 178         }
 179         return ret;
 180 }
 181
 182 #undef open
 183 int mingw_open (const char *filename, int oflags, ...)
 184 {
 185         va_list args;
 186         unsigned mode;
 187         int fd;
 188
 189         va_start(args, oflags);
 190         mode = va_arg(args, int);
 191         va_end(args);
 192
 193         if (!strcmp(filename, "/dev/null"))
 194                 filename = "nul";
 195
 196         fd = open(filename, oflags, mode);
 197
 198         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 199                 DWORD attrs = GetFileAttributes(filename);
 200                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 201                         errno = EISDIR;
 202         }
 203         if ((oflags & O_CREAT) && fd >= 0 &&
 204             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 205                 /*
 206                  * In Windows a file or dir starting with a dot is not
 207                  * automatically hidden. So lets mark it as hidden when
 208                  * such a file is created.
 209                  */
 210                 const char *start = basename((char*)filename);
 211                 if (*start == '.' && make_hidden(filename))
 212                         warning("Could not mark '%s' as hidden.", filename);
 213         }
 214         return fd;
 215 }
 216
 217 #undef write
 218 ssize_t mingw_write(int fd, const void *buf, size_t count)
 219 {
 220         /*
 221          * While write() calls to a file on a local disk are translated
 222          * into WriteFile() calls with a maximum size of 64KB on Windows
 223          * XP and 256KB on Vista, no such cap is placed on writes to
 224          * files over the network on Windows XP.  Unfortunately, there
 225          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 226          * bigger writes fail on Windows XP.
 227          * So we cap to a nice 31MB here to avoid write failures over
 228          * the net without changing the number of WriteFile() calls in
 229          * the local case.
 230          */
 231         return write(fd, buf, min(count, 31 * 1024 * 1024));
 232 }
 233
 234 #undef fopen
 235 FILE *mingw_fopen (const char *filename, const char *otype)
 236 {
 237         int hide = 0;
 238         FILE *file;
 239         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 240             basename((char*)filename)[0] == '.')
 241                 hide = access(filename, F_OK);
 242         if (!strcmp(filename, "/dev/null"))
 243                 filename = "nul";
 244         file = fopen(filename, otype);
 245         if (file && hide && make_hidden(filename))
 246                 warning("Could not mark '%s' as hidden.", filename);
 247         return file;
 248 }
 249
 250 #undef freopen
 251 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 252 {
 253         int hide = 0;
 254         FILE *file;
 255         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 256             basename((char*)filename)[0] == '.')
 257                 hide = access(filename, F_OK);
 258         if (filename && !strcmp(filename, "/dev/null"))
 259                 filename = "nul";
 260         file = freopen(filename, otype, stream);
 261         if (file && hide && make_hidden(filename))
 262                 warning("Could not mark '%s' as hidden.", filename);
 263         return file;
 264 }
 265
 266 /*
 267  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 268  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 269  */
 270 static inline long long filetime_to_hnsec(const FILETIME *ft)
 271 {
 272         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 273         /* Windows to Unix Epoch conversion */
 274         return winTime - 116444736000000000LL;
 275 }
 276
 277 static inline time_t filetime_to_time_t(const FILETIME *ft)
 278 {
 279         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 280 }
 281
 282 /* We keep the do_lstat code in a separate function to avoid recursion.
 283  * When a path ends with a slash, the stat will fail with ENOENT. In
 284  * this case, we strip the trailing slashes and stat again.
 285  */
 286 static int do_lstat(const char *file_name, struct stat *buf)
 287 {
 288         WIN32_FILE_ATTRIBUTE_DATA fdata;
 289
 290         if (!(errno = get_file_attr(file_name, &fdata))) {
 291                 buf->st_ino = 0;
 292                 buf->st_gid = 0;
 293                 buf->st_uid = 0;
 294                 buf->st_nlink = 1;
 295                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 296                 buf->st_size = fdata.nFileSizeLow |
 297                         (((off_t)fdata.nFileSizeHigh)<<32);
 298                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 299                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 300                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 301                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 302                 return 0;
 303         }
 304         return -1;
 305 }
 306
 307 /* We provide our own lstat/fstat functions, since the provided
 308  * lstat/fstat functions are so slow. These stat functions are
 309  * tailored for Git's usage (read: fast), and are not meant to be
 310  * complete. Note that Git stat()s are redirected to mingw_lstat()
 311  * too, since Windows doesn't really handle symlinks that well.
 312  */
 313 int mingw_lstat(const char *file_name, struct stat *buf)
 314 {
 315         int namelen;
 316         static char alt_name[PATH_MAX];
 317
 318         if (!do_lstat(file_name, buf))
 319                 return 0;
 320
 321         /* if file_name ended in a '/', Windows returned ENOENT;
 322          * try again without trailing slashes
 323          */
 324         if (errno != ENOENT)
 325                 return -1;
 326
 327         namelen = strlen(file_name);
 328         if (namelen && file_name[namelen-1] != '/')
 329                 return -1;
 330         while (namelen && file_name[namelen-1] == '/')
 331                 --namelen;
 332         if (!namelen || namelen >= PATH_MAX)
 333                 return -1;
 334
 335         memcpy(alt_name, file_name, namelen);
 336         alt_name[namelen] = 0;
 337         return do_lstat(alt_name, buf);
 338 }
 339
 340 #undef fstat
 341 int mingw_fstat(int fd, struct stat *buf)
 342 {
 343         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 344         BY_HANDLE_FILE_INFORMATION fdata;
 345
 346         if (fh == INVALID_HANDLE_VALUE) {
 347                 errno = EBADF;
 348                 return -1;
 349         }
 350         /* direct non-file handles to MS's fstat() */
 351         if (GetFileType(fh) != FILE_TYPE_DISK)
 352                 return _fstati64(fd, buf);
 353
 354         if (GetFileInformationByHandle(fh, &fdata)) {
 355                 buf->st_ino = 0;
 356                 buf->st_gid = 0;
 357                 buf->st_uid = 0;
 358                 buf->st_nlink = 1;
 359                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 360                 buf->st_size = fdata.nFileSizeLow |
 361                         (((off_t)fdata.nFileSizeHigh)<<32);
 362                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 363                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 364                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 365                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 366                 return 0;
 367         }
 368         errno = EBADF;
 369         return -1;
 370 }
 371
 372 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 373 {
 374         long long winTime = t * 10000000LL + 116444736000000000LL;
 375         ft->dwLowDateTime = winTime;
 376         ft->dwHighDateTime = winTime >> 32;
 377 }
 378
 379 int mingw_utime (const char *file_name, const struct utimbuf *times)
 380 {
 381         FILETIME mft, aft;
 382         int fh, rc;
 383
 384         /* must have write permission */
 385         DWORD attrs = GetFileAttributes(file_name);
 386         if (attrs != INVALID_FILE_ATTRIBUTES &&
 387             (attrs & FILE_ATTRIBUTE_READONLY)) {
 388                 /* ignore errors here; open() will report them */
 389                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 390         }
 391
 392         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 393                 rc = -1;
 394                 goto revert_attrs;
 395         }
 396
 397         time_t_to_filetime(times->modtime, &mft);
 398         time_t_to_filetime(times->actime, &aft);
 399         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 400                 errno = EINVAL;
 401                 rc = -1;
 402         } else
 403                 rc = 0;
 404         close(fh);
 405
 406 revert_attrs:
 407         if (attrs != INVALID_FILE_ATTRIBUTES &&
 408             (attrs & FILE_ATTRIBUTE_READONLY)) {
 409                 /* ignore errors again */
 410                 SetFileAttributes(file_name, attrs);
 411         }
 412         return rc;
 413 }
 414
 415 unsigned int sleep (unsigned int seconds)
 416 {
 417         Sleep(seconds*1000);
 418         return 0;
 419 }
 420
 421 int mkstemp(char *template)
 422 {
 423         char *filename = mktemp(template);
 424         if (filename == NULL)
 425                 return -1;
 426         return open(filename, O_RDWR | O_CREAT, 0600);
 427 }
 428
 429 int gettimeofday(struct timeval *tv, void *tz)
 430 {
 431         FILETIME ft;
 432         long long hnsec;
 433
 434         GetSystemTimeAsFileTime(&ft);
 435         hnsec = filetime_to_hnsec(&ft);
 436         tv->tv_sec = hnsec / 10000000;
 437         tv->tv_usec = (hnsec % 10000000) / 10;
 438         return 0;
 439 }
 440
 441 int pipe(int filedes[2])
 442 {
 443         HANDLE h[2];
 444
 445         /* this creates non-inheritable handles */
 446         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 447                 errno = err_win_to_posix(GetLastError());
 448                 return -1;
 449         }
 450         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 451         if (filedes[0] < 0) {
 452                 CloseHandle(h[0]);
 453                 CloseHandle(h[1]);
 454                 return -1;
 455         }
 456         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 457         if (filedes[0] < 0) {
 458                 close(filedes[0]);
 459                 CloseHandle(h[1]);
 460                 return -1;
 461         }
 462         return 0;
 463 }
 464
 465 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 466 {
 467         int i, pending;
 468
 469         if (timeout >= 0) {
 470                 if (nfds == 0) {
 471                         Sleep(timeout);
 472                         return 0;
 473                 }
 474                 return errno = EINVAL, error("poll timeout not supported");
 475         }
 476
 477         /* When there is only one fd to wait for, then we pretend that
 478          * input is available and let the actual wait happen when the
 479          * caller invokes read().
 480          */
 481         if (nfds == 1) {
 482                 if (!(ufds[0].events & POLLIN))
 483                         return errno = EINVAL, error("POLLIN not set");
 484                 ufds[0].revents = POLLIN;
 485                 return 0;
 486         }
 487
 488 repeat:
 489         pending = 0;
 490         for (i = 0; i < nfds; i++) {
 491                 DWORD avail = 0;
 492                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 493                 if (h == INVALID_HANDLE_VALUE)
 494                         return -1;      /* errno was set */
 495
 496                 if (!(ufds[i].events & POLLIN))
 497                         return errno = EINVAL, error("POLLIN not set");
 498
 499                 /* this emulation works only for pipes */
 500                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 501                         int err = GetLastError();
 502                         if (err == ERROR_BROKEN_PIPE) {
 503                                 ufds[i].revents = POLLHUP;
 504                                 pending++;
 505                         } else {
 506                                 errno = EINVAL;
 507                                 return error("PeekNamedPipe failed,"
 508                                         " GetLastError: %u", err);
 509                         }
 510                 } else if (avail) {
 511                         ufds[i].revents = POLLIN;
 512                         pending++;
 513                 } else
 514                         ufds[i].revents = 0;
 515         }
 516         if (!pending) {
 517                 /* The only times that we spin here is when the process
 518                  * that is connected through the pipes is waiting for
 519                  * its own input data to become available. But since
 520                  * the process (pack-objects) is itself CPU intensive,
 521                  * it will happily pick up the time slice that we are
 522                  * relinquishing here.
 523                  */
 524                 Sleep(0);
 525                 goto repeat;
 526         }
 527         return 0;
 528 }
 529
 530 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 531 {
 532         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 533         memcpy(result, gmtime(timep), sizeof(struct tm));
 534         return result;
 535 }
 536
 537 struct tm *localtime_r(const time_t *timep, struct tm *result)
 538 {
 539         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 540         memcpy(result, localtime(timep), sizeof(struct tm));
 541         return result;
 542 }
 543
 544 #undef getcwd
 545 char *mingw_getcwd(char *pointer, int len)
 546 {
 547         int i;
 548         char *ret = getcwd(pointer, len);
 549         if (!ret)
 550                 return ret;
 551         for (i = 0; pointer[i]; i++)
 552                 if (pointer[i] == '\\')
 553                         pointer[i] = '/';
 554         return ret;
 555 }
 556
 557 #undef getenv
 558 char *mingw_getenv(const char *name)
 559 {
 560         char *result = getenv(name);
 561         if (!result && !strcmp(name, "TMPDIR")) {
 562                 /* on Windows it is TMP and TEMP */
 563                 result = getenv("TMP");
 564                 if (!result)
 565                         result = getenv("TEMP");
 566         }
 567         return result;
 568 }
 569
 570 /*
 571  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 572  * (Parsing C++ Command-Line Arguments)
 573  */
 574 static const char *quote_arg(const char *arg)
 575 {
 576         /* count chars to quote */
 577         int len = 0, n = 0;
 578         int force_quotes = 0;
 579         char *q, *d;
 580         const char *p = arg;
 581         if (!*p) force_quotes = 1;
 582         while (*p) {
 583                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 584                         force_quotes = 1;
 585                 else if (*p == '"')
 586                         n++;
 587                 else if (*p == '\\') {
 588                         int count = 0;
 589                         while (*p == '\\') {
 590                                 count++;
 591                                 p++;
 592                                 len++;
 593                         }
 594                         if (*p == '"')
 595                                 n += count*2 + 1;
 596                         continue;
 597                 }
 598                 len++;
 599                 p++;
 600         }
 601         if (!force_quotes && n == 0)
 602                 return arg;
 603
 604         /* insert \ where necessary */
 605         d = q = xmalloc(len+n+3);
 606         *d++ = '"';
 607         while (*arg) {
 608                 if (*arg == '"')
 609                         *d++ = '\\';
 610                 else if (*arg == '\\') {
 611                         int count = 0;
 612                         while (*arg == '\\') {
 613                                 count++;
 614                                 *d++ = *arg++;
 615                         }
 616                         if (*arg == '"') {
 617                                 while (count-- > 0)
 618                                         *d++ = '\\';
 619                                 *d++ = '\\';
 620                         }
 621                 }
 622                 *d++ = *arg++;
 623         }
 624         *d++ = '"';
 625         *d++ = 0;
 626         return q;
 627 }
 628
 629 static const char *parse_interpreter(const char *cmd)
 630 {
 631         static char buf[100];
 632         char *p, *opt;
 633         int n, fd;
 634
 635         /* don't even try a .exe */
 636         n = strlen(cmd);
 637         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 638                 return NULL;
 639
 640         fd = open(cmd, O_RDONLY);
 641         if (fd < 0)
 642                 return NULL;
 643         n = read(fd, buf, sizeof(buf)-1);
 644         close(fd);
 645         if (n < 4)      /* at least '#!/x' and not error */
 646                 return NULL;
 647
 648         if (buf[0] != '#' || buf[1] != '!')
 649                 return NULL;
 650         buf[n] = '\0';
 651         p = buf + strcspn(buf, "\r\n");
 652         if (!*p)
 653                 return NULL;
 654
 655         *p = '\0';
 656         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 657                 return NULL;
 658         /* strip options */
 659         if ((opt = strchr(p+1, ' ')))
 660                 *opt = '\0';
 661         return p+1;
 662 }
 663
 664 /*
 665  * Splits the PATH into parts.
 666  */
 667 static char **get_path_split(void)
 668 {
 669         char *p, **path, *envpath = getenv("PATH");
 670         int i, n = 0;
 671
 672         if (!envpath || !*envpath)
 673                 return NULL;
 674
 675         envpath = xstrdup(envpath);
 676         p = envpath;
 677         while (p) {
 678                 char *dir = p;
 679                 p = strchr(p, ';');
 680                 if (p) *p++ = '\0';
 681                 if (*dir) {     /* not earlier, catches series of ; */
 682                         ++n;
 683                 }
 684         }
 685         if (!n)
 686                 return NULL;
 687
 688         path = xmalloc((n+1)*sizeof(char *));
 689         p = envpath;
 690         i = 0;
 691         do {
 692                 if (*p)
 693                         path[i++] = xstrdup(p);
 694                 p = p+strlen(p)+1;
 695         } while (i < n);
 696         path[i] = NULL;
 697
 698         free(envpath);
 699
 700         return path;
 701 }
 702
 703 static void free_path_split(char **path)
 704 {
 705         char **p = path;
 706
 707         if (!path)
 708                 return;
 709
 710         while (*p)
 711                 free(*p++);
 712         free(path);
 713 }
 714
 715 /*
 716  * exe_only means that we only want to detect .exe files, but not scripts
 717  * (which do not have an extension)
 718  */
 719 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 720 {
 721         char path[MAX_PATH];
 722         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 723
 724         if (!isexe && access(path, F_OK) == 0)
 725                 return xstrdup(path);
 726         path[strlen(path)-4] = '\0';
 727         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 728                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 729                         return xstrdup(path);
 730         return NULL;
 731 }
 732
 733 /*
 734  * Determines the absolute path of cmd using the the split path in path.
 735  * If cmd contains a slash or backslash, no lookup is performed.
 736  */
 737 static char *path_lookup(const char *cmd, char **path, int exe_only)
 738 {
 739         char *prog = NULL;
 740         int len = strlen(cmd);
 741         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 742
 743         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 744                 prog = xstrdup(cmd);
 745
 746         while (!prog && *path)
 747                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 748
 749         return prog;
 750 }
 751
 752 static int env_compare(const void *a, const void *b)
 753 {
 754         char *const *ea = a;
 755         char *const *eb = b;
 756         return strcasecmp(*ea, *eb);
 757 }
 758
 759 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 760                               const char *dir,
 761                               int prepend_cmd, int fhin, int fhout, int fherr)
 762 {
 763         STARTUPINFO si;
 764         PROCESS_INFORMATION pi;
 765         struct strbuf envblk, args;
 766         unsigned flags;
 767         BOOL ret;
 768
 769         /* Determine whether or not we are associated to a console */
 770         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 771                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 772                         FILE_ATTRIBUTE_NORMAL, NULL);
 773         if (cons == INVALID_HANDLE_VALUE) {
 774                 /* There is no console associated with this process.
 775                  * Since the child is a console process, Windows
 776                  * would normally create a console window. But
 777                  * since we'll be redirecting std streams, we do
 778                  * not need the console.
 779                  * It is necessary to use DETACHED_PROCESS
 780                  * instead of CREATE_NO_WINDOW to make ssh
 781                  * recognize that it has no console.
 782                  */
 783                 flags = DETACHED_PROCESS;
 784         } else {
 785                 /* There is already a console. If we specified
 786                  * DETACHED_PROCESS here, too, Windows would
 787                  * disassociate the child from the console.
 788                  * The same is true for CREATE_NO_WINDOW.
 789                  * Go figure!
 790                  */
 791                 flags = 0;
 792                 CloseHandle(cons);
 793         }
 794         memset(&si, 0, sizeof(si));
 795         si.cb = sizeof(si);
 796         si.dwFlags = STARTF_USESTDHANDLES;
 797         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 798         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 799         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 800
 801         /* concatenate argv, quoting args as we go */
 802         strbuf_init(&args, 0);
 803         if (prepend_cmd) {
 804                 char *quoted = (char *)quote_arg(cmd);
 805                 strbuf_addstr(&args, quoted);
 806                 if (quoted != cmd)
 807                         free(quoted);
 808         }
 809         for (; *argv; argv++) {
 810                 char *quoted = (char *)quote_arg(*argv);
 811                 if (*args.buf)
 812                         strbuf_addch(&args, ' ');
 813                 strbuf_addstr(&args, quoted);
 814                 if (quoted != *argv)
 815                         free(quoted);
 816         }
 817
 818         if (env) {
 819                 int count = 0;
 820                 char **e, **sorted_env;
 821
 822                 for (e = env; *e; e++)
 823                         count++;
 824
 825                 /* environment must be sorted */
 826                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 827                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 828                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 829
 830                 strbuf_init(&envblk, 0);
 831                 for (e = sorted_env; *e; e++) {
 832                         strbuf_addstr(&envblk, *e);
 833                         strbuf_addch(&envblk, '\0');
 834                 }
 835                 free(sorted_env);
 836         }
 837
 838         memset(&pi, 0, sizeof(pi));
 839         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 840                 env ? envblk.buf : NULL, dir, &si, &pi);
 841
 842         if (env)
 843                 strbuf_release(&envblk);
 844         strbuf_release(&args);
 845
 846         if (!ret) {
 847                 errno = ENOENT;
 848                 return -1;
 849         }
 850         CloseHandle(pi.hThread);
 851         return (pid_t)pi.hProcess;
 852 }
 853
 854 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 855                            int prepend_cmd)
 856 {
 857         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 858 }
 859
 860 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 861                      const char *dir,
 862                      int fhin, int fhout, int fherr)
 863 {
 864         pid_t pid;
 865         char **path = get_path_split();
 866         char *prog = path_lookup(cmd, path, 0);
 867
 868         if (!prog) {
 869                 errno = ENOENT;
 870                 pid = -1;
 871         }
 872         else {
 873                 const char *interpr = parse_interpreter(prog);
 874
 875                 if (interpr) {
 876                         const char *argv0 = argv[0];
 877                         char *iprog = path_lookup(interpr, path, 1);
 878                         argv[0] = prog;
 879                         if (!iprog) {
 880                                 errno = ENOENT;
 881                                 pid = -1;
 882                         }
 883                         else {
 884                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 885                                                        fhin, fhout, fherr);
 886                                 free(iprog);
 887                         }
 888                         argv[0] = argv0;
 889                 }
 890                 else
 891                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 892                                                fhin, fhout, fherr);
 893                 free(prog);
 894         }
 895         free_path_split(path);
 896         return pid;
 897 }
 898
 899 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 900 {
 901         const char *interpr = parse_interpreter(cmd);
 902         char **path;
 903         char *prog;
 904         int pid = 0;
 905
 906         if (!interpr)
 907                 return 0;
 908         path = get_path_split();
 909         prog = path_lookup(interpr, path, 1);
 910         if (prog) {
 911                 int argc = 0;
 912                 const char **argv2;
 913                 while (argv[argc]) argc++;
 914                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 915                 argv2[0] = (char *)cmd; /* full path to the script file */
 916                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 917                 pid = mingw_spawnve(prog, argv2, env, 1);
 918                 if (pid >= 0) {
 919                         int status;
 920                         if (waitpid(pid, &status, 0) < 0)
 921                                 status = 255;
 922                         exit(status);
 923                 }
 924                 pid = 1;        /* indicate that we tried but failed */
 925                 free(prog);
 926                 free(argv2);
 927         }
 928         free_path_split(path);
 929         return pid;
 930 }
 931
 932 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 933 {
 934         /* check if git_command is a shell script */
 935         if (!try_shell_exec(cmd, argv, (char **)env)) {
 936                 int pid, status;
 937
 938                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 939                 if (pid < 0)
 940                         return;
 941                 if (waitpid(pid, &status, 0) < 0)
 942                         status = 255;
 943                 exit(status);
 944         }
 945 }
 946
 947 void mingw_execvp(const char *cmd, char *const *argv)
 948 {
 949         char **path = get_path_split();
 950         char *prog = path_lookup(cmd, path, 0);
 951
 952         if (prog) {
 953                 mingw_execve(prog, argv, environ);
 954                 free(prog);
 955         } else
 956                 errno = ENOENT;
 957
 958         free_path_split(path);
 959 }
 960
 961 static char **copy_environ(void)
 962 {
 963         char **env;
 964         int i = 0;
 965         while (environ[i])
 966                 i++;
 967         env = xmalloc((i+1)*sizeof(*env));
 968         for (i = 0; environ[i]; i++)
 969                 env[i] = xstrdup(environ[i]);
 970         env[i] = NULL;
 971         return env;
 972 }
 973
 974 void free_environ(char **env)
 975 {
 976         int i;
 977         for (i = 0; env[i]; i++)
 978                 free(env[i]);
 979         free(env);
 980 }
 981
 982 static int lookup_env(char **env, const char *name, size_t nmln)
 983 {
 984         int i;
 985
 986         for (i = 0; env[i]; i++) {
 987                 if (0 == strncmp(env[i], name, nmln)
 988                     && '=' == env[i][nmln])
 989                         /* matches */
 990                         return i;
 991         }
 992         return -1;
 993 }
 994
 995 /*
 996  * If name contains '=', then sets the variable, otherwise it unsets it
 997  */
 998 static char **env_setenv(char **env, const char *name)
 999 {
1000         char *eq = strchrnul(name, '=');
1001         int i = lookup_env(env, name, eq-name);
1002
1003         if (i < 0) {
1004                 if (*eq) {
1005                         for (i = 0; env[i]; i++)
1006                                 ;
1007                         env = xrealloc(env, (i+2)*sizeof(*env));
1008                         env[i] = xstrdup(name);
1009                         env[i+1] = NULL;
1010                 }
1011         }
1012         else {
1013                 free(env[i]);
1014                 if (*eq)
1015                         env[i] = xstrdup(name);
1016                 else
1017                         for (; env[i]; i++)
1018                                 env[i] = env[i+1];
1019         }
1020         return env;
1021 }
1022
1023 /*
1024  * Copies global environ and adjusts variables as specified by vars.
1025  */
1026 char **make_augmented_environ(const char *const *vars)
1027 {
1028         char **env = copy_environ();
1029
1030         while (*vars)
1031                 env = env_setenv(env, *vars++);
1032         return env;
1033 }
1034
1035 /*
1036  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1037  * that service contains a numerical port, or that it it is null. It
1038  * does a simple search using gethostbyname, and returns one IPv4 host
1039  * if one was found.
1040  */
1041 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1042                                    const struct addrinfo *hints,
1043                                    struct addrinfo **res)
1044 {
1045         struct hostent *h = gethostbyname(node);
1046         struct addrinfo *ai;
1047         struct sockaddr_in *sin;
1048
1049         if (!h)
1050                 return WSAGetLastError();
1051
1052         ai = xmalloc(sizeof(struct addrinfo));
1053         *res = ai;
1054         ai->ai_flags = 0;
1055         ai->ai_family = AF_INET;
1056         ai->ai_socktype = hints->ai_socktype;
1057         switch (hints->ai_socktype) {
1058         case SOCK_STREAM:
1059                 ai->ai_protocol = IPPROTO_TCP;
1060                 break;
1061         case SOCK_DGRAM:
1062                 ai->ai_protocol = IPPROTO_UDP;
1063                 break;
1064         default:
1065                 ai->ai_protocol = 0;
1066                 break;
1067         }
1068         ai->ai_addrlen = sizeof(struct sockaddr_in);
1069         ai->ai_canonname = strdup(h->h_name);
1070
1071         sin = xmalloc(ai->ai_addrlen);
1072         memset(sin, 0, ai->ai_addrlen);
1073         sin->sin_family = AF_INET;
1074         if (service)
1075                 sin->sin_port = htons(atoi(service));
1076         sin->sin_addr = *(struct in_addr *)h->h_addr;
1077         ai->ai_addr = (struct sockaddr *)sin;
1078         ai->ai_next = 0;
1079         return 0;
1080 }
1081
1082 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1083 {
1084         free(res->ai_canonname);
1085         free(res->ai_addr);
1086         free(res);
1087 }
1088
1089 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1090                                    char *host, DWORD hostlen,
1091                                    char *serv, DWORD servlen, int flags)
1092 {
1093         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1094         if (sa->sa_family != AF_INET)
1095                 return EAI_FAMILY;
1096         if (!host && !serv)
1097                 return EAI_NONAME;
1098
1099         if (host && hostlen > 0) {
1100                 struct hostent *ent = NULL;
1101                 if (!(flags & NI_NUMERICHOST))
1102                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1103                                             sizeof(sin->sin_addr), AF_INET);
1104
1105                 if (ent)
1106                         snprintf(host, hostlen, "%s", ent->h_name);
1107                 else if (flags & NI_NAMEREQD)
1108                         return EAI_NONAME;
1109                 else
1110                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1111         }
1112
1113         if (serv && servlen > 0) {
1114                 struct servent *ent = NULL;
1115                 if (!(flags & NI_NUMERICSERV))
1116                         ent = getservbyport(sin->sin_port,
1117                                             flags & NI_DGRAM ? "udp" : "tcp");
1118
1119                 if (ent)
1120                         snprintf(serv, servlen, "%s", ent->s_name);
1121                 else
1122                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1123         }
1124
1125         return 0;
1126 }
1127
1128 static HMODULE ipv6_dll = NULL;
1129 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1130 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1131                                       const struct addrinfo *hints,
1132                                       struct addrinfo **res);
1133 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1134                                       char *host, DWORD hostlen,
1135                                       char *serv, DWORD servlen, int flags);
1136 /*
1137  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1138  * don't need to try to load that one dynamically.
1139  */
1140
1141 static void socket_cleanup(void)
1142 {
1143         WSACleanup();
1144         if (ipv6_dll)
1145                 FreeLibrary(ipv6_dll);
1146         ipv6_dll = NULL;
1147         ipv6_freeaddrinfo = freeaddrinfo_stub;
1148         ipv6_getaddrinfo = getaddrinfo_stub;
1149         ipv6_getnameinfo = getnameinfo_stub;
1150 }
1151
1152 static void ensure_socket_initialization(void)
1153 {
1154         WSADATA wsa;
1155         static int initialized = 0;
1156         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1157         const char **name;
1158
1159         if (initialized)
1160                 return;
1161
1162         if (WSAStartup(MAKEWORD(2,2), &wsa))
1163                 die("unable to initialize winsock subsystem, error %d",
1164                         WSAGetLastError());
1165
1166         for (name = libraries; *name; name++) {
1167                 ipv6_dll = LoadLibrary(*name);
1168                 if (!ipv6_dll)
1169                         continue;
1170
1171                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1172                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1173                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1174                                                    const struct addrinfo *,
1175                                                    struct addrinfo **))
1176                         GetProcAddress(ipv6_dll, "getaddrinfo");
1177                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1178                                                    socklen_t, char *, DWORD,
1179                                                    char *, DWORD, int))
1180                         GetProcAddress(ipv6_dll, "getnameinfo");
1181                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1182                         FreeLibrary(ipv6_dll);
1183                         ipv6_dll = NULL;
1184                 } else
1185                         break;
1186         }
1187         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1188                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1189                 ipv6_getaddrinfo = getaddrinfo_stub;
1190                 ipv6_getnameinfo = getnameinfo_stub;
1191         }
1192
1193         atexit(socket_cleanup);
1194         initialized = 1;
1195 }
1196
1197 #undef gethostbyname
1198 struct hostent *mingw_gethostbyname(const char *host)
1199 {
1200         ensure_socket_initialization();
1201         return gethostbyname(host);
1202 }
1203
1204 void mingw_freeaddrinfo(struct addrinfo *res)
1205 {
1206         ipv6_freeaddrinfo(res);
1207 }
1208
1209 int mingw_getaddrinfo(const char *node, const char *service,
1210                       const struct addrinfo *hints, struct addrinfo **res)
1211 {
1212         ensure_socket_initialization();
1213         return ipv6_getaddrinfo(node, service, hints, res);
1214 }
1215
1216 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1217                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1218                       int flags)
1219 {
1220         ensure_socket_initialization();
1221         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1222 }
1223
1224 int mingw_socket(int domain, int type, int protocol)
1225 {
1226         int sockfd;
1227         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1228         if (s == INVALID_SOCKET) {
1229                 /*
1230                  * WSAGetLastError() values are regular BSD error codes
1231                  * biased by WSABASEERR.
1232                  * However, strerror() does not know about networking
1233                  * specific errors, which are values beginning at 38 or so.
1234                  * Therefore, we choose to leave the biased error code
1235                  * in errno so that _if_ someone looks up the code somewhere,
1236                  * then it is at least the number that are usually listed.
1237                  */
1238                 errno = WSAGetLastError();
1239                 return -1;
1240         }
1241         /* convert into a file descriptor */
1242         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1243                 closesocket(s);
1244                 return error("unable to make a socket file descriptor: %s",
1245                         strerror(errno));
1246         }
1247         return sockfd;
1248 }
1249
1250 #undef connect
1251 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1252 {
1253         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1254         return connect(s, sa, sz);
1255 }
1256
1257 #undef rename
1258 int mingw_rename(const char *pold, const char *pnew)
1259 {
1260         DWORD attrs, gle;
1261         int tries = 0;
1262
1263         /*
1264          * Try native rename() first to get errno right.
1265          * It is based on MoveFile(), which cannot overwrite existing files.
1266          */
1267         if (!rename(pold, pnew))
1268                 return 0;
1269         if (errno != EEXIST)
1270                 return -1;
1271 repeat:
1272         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1273                 return 0;
1274         /* TODO: translate more errors */
1275         gle = GetLastError();
1276         if (gle == ERROR_ACCESS_DENIED &&
1277             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1278                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1279                         errno = EISDIR;
1280                         return -1;
1281                 }
1282                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1283                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1284                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1285                                 return 0;
1286                         gle = GetLastError();
1287                         /* revert file attributes on failure */
1288                         SetFileAttributes(pnew, attrs);
1289                 }
1290         }
1291         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1292                 /*
1293                  * We assume that some other process had the source or
1294                  * destination file open at the wrong moment and retry.
1295                  * In order to give the other process a higher chance to
1296                  * complete its operation, we give up our time slice now.
1297                  * If we have to retry again, we do sleep a bit.
1298                  */
1299                 Sleep(delay[tries]);
1300                 tries++;
1301                 goto repeat;
1302         }
1303         errno = EACCES;
1304         return -1;
1305 }
1306
1307 /*
1308  * Note that this doesn't return the actual pagesize, but
1309  * the allocation granularity. If future Windows specific git code
1310  * needs the real getpagesize function, we need to find another solution.
1311  */
1312 int mingw_getpagesize(void)
1313 {
1314         SYSTEM_INFO si;
1315         GetSystemInfo(&si);
1316         return si.dwAllocationGranularity;
1317 }
1318
1319 struct passwd *getpwuid(int uid)
1320 {
1321         static char user_name[100];
1322         static struct passwd p;
1323
1324         DWORD len = sizeof(user_name);
1325         if (!GetUserName(user_name, &len))
1326                 return NULL;
1327         p.pw_name = user_name;
1328         p.pw_gecos = "unknown";
1329         p.pw_dir = NULL;
1330         return &p;
1331 }
1332
1333 static HANDLE timer_event;
1334 static HANDLE timer_thread;
1335 static int timer_interval;
1336 static int one_shot;
1337 static sig_handler_t timer_fn = SIG_DFL;
1338
1339 /* The timer works like this:
1340  * The thread, ticktack(), is a trivial routine that most of the time
1341  * only waits to receive the signal to terminate. The main thread tells
1342  * the thread to terminate by setting the timer_event to the signalled
1343  * state.
1344  * But ticktack() interrupts the wait state after the timer's interval
1345  * length to call the signal handler.
1346  */
1347
1348 static unsigned __stdcall ticktack(void *dummy)
1349 {
1350         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1351                 if (timer_fn == SIG_DFL)
1352                         die("Alarm");
1353                 if (timer_fn != SIG_IGN)
1354                         timer_fn(SIGALRM);
1355                 if (one_shot)
1356                         break;
1357         }
1358         return 0;
1359 }
1360
1361 static int start_timer_thread(void)
1362 {
1363         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1364         if (timer_event) {
1365                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1366                 if (!timer_thread )
1367                         return errno = ENOMEM,
1368                                 error("cannot start timer thread");
1369         } else
1370                 return errno = ENOMEM,
1371                         error("cannot allocate resources for timer");
1372         return 0;
1373 }
1374
1375 static void stop_timer_thread(void)
1376 {
1377         if (timer_event)
1378                 SetEvent(timer_event);  /* tell thread to terminate */
1379         if (timer_thread) {
1380                 int rc = WaitForSingleObject(timer_thread, 1000);
1381                 if (rc == WAIT_TIMEOUT)
1382                         error("timer thread did not terminate timely");
1383                 else if (rc != WAIT_OBJECT_0)
1384                         error("waiting for timer thread failed: %lu",
1385                               GetLastError());
1386                 CloseHandle(timer_thread);
1387         }
1388         if (timer_event)
1389                 CloseHandle(timer_event);
1390         timer_event = NULL;
1391         timer_thread = NULL;
1392 }
1393
1394 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1395 {
1396         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1397 }
1398
1399 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1400 {
1401         static const struct timeval zero;
1402         static int atexit_done;
1403
1404         if (out != NULL)
1405                 return errno = EINVAL,
1406                         error("setitimer param 3 != NULL not implemented");
1407         if (!is_timeval_eq(&in->it_interval, &zero) &&
1408             !is_timeval_eq(&in->it_interval, &in->it_value))
1409                 return errno = EINVAL,
1410                         error("setitimer: it_interval must be zero or eq it_value");
1411
1412         if (timer_thread)
1413                 stop_timer_thread();
1414
1415         if (is_timeval_eq(&in->it_value, &zero) &&
1416             is_timeval_eq(&in->it_interval, &zero))
1417                 return 0;
1418
1419         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1420         one_shot = is_timeval_eq(&in->it_interval, &zero);
1421         if (!atexit_done) {
1422                 atexit(stop_timer_thread);
1423                 atexit_done = 1;
1424         }
1425         return start_timer_thread();
1426 }
1427
1428 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1429 {
1430         if (sig != SIGALRM)
1431                 return errno = EINVAL,
1432                         error("sigaction only implemented for SIGALRM");
1433         if (out != NULL)
1434                 return errno = EINVAL,
1435                         error("sigaction: param 3 != NULL not implemented");
1436
1437         timer_fn = in->sa_handler;
1438         return 0;
1439 }
1440
1441 #undef signal
1442 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1443 {
1444         sig_handler_t old = timer_fn;
1445         if (sig != SIGALRM)
1446                 return signal(sig, handler);
1447         timer_fn = handler;
1448         return old;
1449 }
1450
1451 static const char *make_backslash_path(const char *path)
1452 {
1453         static char buf[PATH_MAX + 1];
1454         char *c;
1455
1456         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1457                 die("Too long path: %.*s", 60, path);
1458
1459         for (c = buf; *c; c++) {
1460                 if (*c == '/')
1461                         *c = '\\';
1462         }
1463         return buf;
1464 }
1465
1466 void mingw_open_html(const char *unixpath)
1467 {
1468         const char *htmlpath = make_backslash_path(unixpath);
1469         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1470                         const char *, const char *, const char *, INT);
1471         T ShellExecute;
1472         HMODULE shell32;
1473
1474         shell32 = LoadLibrary("shell32.dll");
1475         if (!shell32)
1476                 die("cannot load shell32.dll");
1477         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1478         if (!ShellExecute)
1479                 die("cannot run browser");
1480
1481         printf("Launching default browser to display HTML ...\n");
1482         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1483
1484         FreeLibrary(shell32);
1485 }
1486
1487 int link(const char *oldpath, const char *newpath)
1488 {
1489         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1490         static T create_hard_link = NULL;
1491         if (!create_hard_link) {
1492                 create_hard_link = (T) GetProcAddress(
1493                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1494                 if (!create_hard_link)
1495                         create_hard_link = (T)-1;
1496         }
1497         if (create_hard_link == (T)-1) {
1498                 errno = ENOSYS;
1499                 return -1;
1500         }
1501         if (!create_hard_link(newpath, oldpath, NULL)) {
1502                 errno = err_win_to_posix(GetLastError());
1503                 return -1;
1504         }
1505         return 0;
1506 }
1507
1508 char *getpass(const char *prompt)
1509 {
1510         struct strbuf buf = STRBUF_INIT;
1511
1512         fputs(prompt, stderr);
1513         for (;;) {
1514                 char c = _getch();
1515                 if (c == '\r' || c == '\n')
1516                         break;
1517                 strbuf_addch(&buf, c);
1518         }
1519         fputs("\n", stderr);
1520         return strbuf_detach(&buf, NULL);
1521 }
1522
1523 #ifndef NO_MINGW_REPLACE_READDIR
1524 /* MinGW readdir implementation to avoid extra lstats for Git */
1525 struct mingw_DIR
1526 {
1527         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1528         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1529         long                    dd_handle;      /* _findnext handle */
1530         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1531         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1532 };
1533
1534 struct dirent *mingw_readdir(DIR *dir)
1535 {
1536         WIN32_FIND_DATAA buf;
1537         HANDLE handle;
1538         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1539
1540         if (!dir->dd_handle) {
1541                 errno = EBADF; /* No set_errno for mingw */
1542                 return NULL;
1543         }
1544
1545         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1546         {
1547                 DWORD lasterr;
1548                 handle = FindFirstFileA(dir->dd_name, &buf);
1549                 lasterr = GetLastError();
1550                 dir->dd_handle = (long)handle;
1551                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1552                         errno = err_win_to_posix(lasterr);
1553                         return NULL;
1554                 }
1555         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1556                 return NULL;
1557         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1558                 DWORD lasterr = GetLastError();
1559                 FindClose((HANDLE)dir->dd_handle);
1560                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1561                 /* POSIX says you shouldn't set errno when readdir can't
1562                    find any more files; so, if another error we leave it set. */
1563                 if (lasterr != ERROR_NO_MORE_FILES)
1564                         errno = err_win_to_posix(lasterr);
1565                 return NULL;
1566         }
1567
1568         /* We get here if `buf' contains valid data.  */
1569         strcpy(dir->dd_dir.d_name, buf.cFileName);
1570         ++dir->dd_stat;
1571
1572         /* Set file type, based on WIN32_FIND_DATA */
1573         mdir->dd_dir.d_type = 0;
1574         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1575                 mdir->dd_dir.d_type |= DT_DIR;
1576         else
1577                 mdir->dd_dir.d_type |= DT_REG;
1578
1579         return (struct dirent*)&dir->dd_dir;
1580 }
1581 #endif // !NO_MINGW_REPLACE_READDIR