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         if (times) {
 370                 time_t_to_filetime(times->modtime, &mft);
 371                 time_t_to_filetime(times->actime, &aft);
 372         } else {
 373                 GetSystemTimeAsFileTime(&mft);
 374                 aft = mft;
 375         }
 376         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 377                 errno = EINVAL;
 378                 rc = -1;
 379         } else
 380                 rc = 0;
 381         close(fh);
 382
 383 revert_attrs:
 384         if (attrs != INVALID_FILE_ATTRIBUTES &&
 385             (attrs & FILE_ATTRIBUTE_READONLY)) {
 386                 /* ignore errors again */
 387                 SetFileAttributes(file_name, attrs);
 388         }
 389         return rc;
 390 }
 391
 392 unsigned int sleep (unsigned int seconds)
 393 {
 394         Sleep(seconds*1000);
 395         return 0;
 396 }
 397
 398 int mkstemp(char *template)
 399 {
 400         char *filename = mktemp(template);
 401         if (filename == NULL)
 402                 return -1;
 403         return open(filename, O_RDWR | O_CREAT, 0600);
 404 }
 405
 406 int gettimeofday(struct timeval *tv, void *tz)
 407 {
 408         FILETIME ft;
 409         long long hnsec;
 410
 411         GetSystemTimeAsFileTime(&ft);
 412         hnsec = filetime_to_hnsec(&ft);
 413         tv->tv_sec = hnsec / 10000000;
 414         tv->tv_usec = (hnsec % 10000000) / 10;
 415         return 0;
 416 }
 417
 418 int pipe(int filedes[2])
 419 {
 420         HANDLE h[2];
 421
 422         /* this creates non-inheritable handles */
 423         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 424                 errno = err_win_to_posix(GetLastError());
 425                 return -1;
 426         }
 427         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 428         if (filedes[0] < 0) {
 429                 CloseHandle(h[0]);
 430                 CloseHandle(h[1]);
 431                 return -1;
 432         }
 433         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 434         if (filedes[0] < 0) {
 435                 close(filedes[0]);
 436                 CloseHandle(h[1]);
 437                 return -1;
 438         }
 439         return 0;
 440 }
 441
 442 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 443 {
 444         int i, pending;
 445
 446         if (timeout >= 0) {
 447                 if (nfds == 0) {
 448                         Sleep(timeout);
 449                         return 0;
 450                 }
 451                 return errno = EINVAL, error("poll timeout not supported");
 452         }
 453
 454         /* When there is only one fd to wait for, then we pretend that
 455          * input is available and let the actual wait happen when the
 456          * caller invokes read().
 457          */
 458         if (nfds == 1) {
 459                 if (!(ufds[0].events & POLLIN))
 460                         return errno = EINVAL, error("POLLIN not set");
 461                 ufds[0].revents = POLLIN;
 462                 return 0;
 463         }
 464
 465 repeat:
 466         pending = 0;
 467         for (i = 0; i < nfds; i++) {
 468                 DWORD avail = 0;
 469                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 470                 if (h == INVALID_HANDLE_VALUE)
 471                         return -1;      /* errno was set */
 472
 473                 if (!(ufds[i].events & POLLIN))
 474                         return errno = EINVAL, error("POLLIN not set");
 475
 476                 /* this emulation works only for pipes */
 477                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 478                         int err = GetLastError();
 479                         if (err == ERROR_BROKEN_PIPE) {
 480                                 ufds[i].revents = POLLHUP;
 481                                 pending++;
 482                         } else {
 483                                 errno = EINVAL;
 484                                 return error("PeekNamedPipe failed,"
 485                                         " GetLastError: %u", err);
 486                         }
 487                 } else if (avail) {
 488                         ufds[i].revents = POLLIN;
 489                         pending++;
 490                 } else
 491                         ufds[i].revents = 0;
 492         }
 493         if (!pending) {
 494                 /* The only times that we spin here is when the process
 495                  * that is connected through the pipes is waiting for
 496                  * its own input data to become available. But since
 497                  * the process (pack-objects) is itself CPU intensive,
 498                  * it will happily pick up the time slice that we are
 499                  * relinquishing here.
 500                  */
 501                 Sleep(0);
 502                 goto repeat;
 503         }
 504         return 0;
 505 }
 506
 507 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 508 {
 509         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 510         memcpy(result, gmtime(timep), sizeof(struct tm));
 511         return result;
 512 }
 513
 514 struct tm *localtime_r(const time_t *timep, struct tm *result)
 515 {
 516         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 517         memcpy(result, localtime(timep), sizeof(struct tm));
 518         return result;
 519 }
 520
 521 #undef getcwd
 522 char *mingw_getcwd(char *pointer, int len)
 523 {
 524         int i;
 525         char *ret = getcwd(pointer, len);
 526         if (!ret)
 527                 return ret;
 528         for (i = 0; pointer[i]; i++)
 529                 if (pointer[i] == '\\')
 530                         pointer[i] = '/';
 531         return ret;
 532 }
 533
 534 #undef getenv
 535 char *mingw_getenv(const char *name)
 536 {
 537         char *result = getenv(name);
 538         if (!result && !strcmp(name, "TMPDIR")) {
 539                 /* on Windows it is TMP and TEMP */
 540                 result = getenv("TMP");
 541                 if (!result)
 542                         result = getenv("TEMP");
 543         }
 544         return result;
 545 }
 546
 547 /*
 548  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 549  * (Parsing C++ Command-Line Arguments)
 550  */
 551 static const char *quote_arg(const char *arg)
 552 {
 553         /* count chars to quote */
 554         int len = 0, n = 0;
 555         int force_quotes = 0;
 556         char *q, *d;
 557         const char *p = arg;
 558         if (!*p) force_quotes = 1;
 559         while (*p) {
 560                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 561                         force_quotes = 1;
 562                 else if (*p == '"')
 563                         n++;
 564                 else if (*p == '\\') {
 565                         int count = 0;
 566                         while (*p == '\\') {
 567                                 count++;
 568                                 p++;
 569                                 len++;
 570                         }
 571                         if (*p == '"')
 572                                 n += count*2 + 1;
 573                         continue;
 574                 }
 575                 len++;
 576                 p++;
 577         }
 578         if (!force_quotes && n == 0)
 579                 return arg;
 580
 581         /* insert \ where necessary */
 582         d = q = xmalloc(len+n+3);
 583         *d++ = '"';
 584         while (*arg) {
 585                 if (*arg == '"')
 586                         *d++ = '\\';
 587                 else if (*arg == '\\') {
 588                         int count = 0;
 589                         while (*arg == '\\') {
 590                                 count++;
 591                                 *d++ = *arg++;
 592                         }
 593                         if (*arg == '"') {
 594                                 while (count-- > 0)
 595                                         *d++ = '\\';
 596                                 *d++ = '\\';
 597                         }
 598                 }
 599                 *d++ = *arg++;
 600         }
 601         *d++ = '"';
 602         *d++ = 0;
 603         return q;
 604 }
 605
 606 static const char *parse_interpreter(const char *cmd)
 607 {
 608         static char buf[100];
 609         char *p, *opt;
 610         int n, fd;
 611
 612         /* don't even try a .exe */
 613         n = strlen(cmd);
 614         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 615                 return NULL;
 616
 617         fd = open(cmd, O_RDONLY);
 618         if (fd < 0)
 619                 return NULL;
 620         n = read(fd, buf, sizeof(buf)-1);
 621         close(fd);
 622         if (n < 4)      /* at least '#!/x' and not error */
 623                 return NULL;
 624
 625         if (buf[0] != '#' || buf[1] != '!')
 626                 return NULL;
 627         buf[n] = '\0';
 628         p = buf + strcspn(buf, "\r\n");
 629         if (!*p)
 630                 return NULL;
 631
 632         *p = '\0';
 633         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 634                 return NULL;
 635         /* strip options */
 636         if ((opt = strchr(p+1, ' ')))
 637                 *opt = '\0';
 638         return p+1;
 639 }
 640
 641 /*
 642  * Splits the PATH into parts.
 643  */
 644 static char **get_path_split(void)
 645 {
 646         char *p, **path, *envpath = getenv("PATH");
 647         int i, n = 0;
 648
 649         if (!envpath || !*envpath)
 650                 return NULL;
 651
 652         envpath = xstrdup(envpath);
 653         p = envpath;
 654         while (p) {
 655                 char *dir = p;
 656                 p = strchr(p, ';');
 657                 if (p) *p++ = '\0';
 658                 if (*dir) {     /* not earlier, catches series of ; */
 659                         ++n;
 660                 }
 661         }
 662         if (!n)
 663                 return NULL;
 664
 665         path = xmalloc((n+1)*sizeof(char *));
 666         p = envpath;
 667         i = 0;
 668         do {
 669                 if (*p)
 670                         path[i++] = xstrdup(p);
 671                 p = p+strlen(p)+1;
 672         } while (i < n);
 673         path[i] = NULL;
 674
 675         free(envpath);
 676
 677         return path;
 678 }
 679
 680 static void free_path_split(char **path)
 681 {
 682         char **p = path;
 683
 684         if (!path)
 685                 return;
 686
 687         while (*p)
 688                 free(*p++);
 689         free(path);
 690 }
 691
 692 /*
 693  * exe_only means that we only want to detect .exe files, but not scripts
 694  * (which do not have an extension)
 695  */
 696 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 697 {
 698         char path[MAX_PATH];
 699         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 700
 701         if (!isexe && access(path, F_OK) == 0)
 702                 return xstrdup(path);
 703         path[strlen(path)-4] = '\0';
 704         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 705                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 706                         return xstrdup(path);
 707         return NULL;
 708 }
 709
 710 /*
 711  * Determines the absolute path of cmd using the split path in path.
 712  * If cmd contains a slash or backslash, no lookup is performed.
 713  */
 714 static char *path_lookup(const char *cmd, char **path, int exe_only)
 715 {
 716         char *prog = NULL;
 717         int len = strlen(cmd);
 718         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 719
 720         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 721                 prog = xstrdup(cmd);
 722
 723         while (!prog && *path)
 724                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 725
 726         return prog;
 727 }
 728
 729 static int env_compare(const void *a, const void *b)
 730 {
 731         char *const *ea = a;
 732         char *const *eb = b;
 733         return strcasecmp(*ea, *eb);
 734 }
 735
 736 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 737                               const char *dir,
 738                               int prepend_cmd, int fhin, int fhout, int fherr)
 739 {
 740         STARTUPINFO si;
 741         PROCESS_INFORMATION pi;
 742         struct strbuf envblk, args;
 743         unsigned flags;
 744         BOOL ret;
 745
 746         /* Determine whether or not we are associated to a console */
 747         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 748                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 749                         FILE_ATTRIBUTE_NORMAL, NULL);
 750         if (cons == INVALID_HANDLE_VALUE) {
 751                 /* There is no console associated with this process.
 752                  * Since the child is a console process, Windows
 753                  * would normally create a console window. But
 754                  * since we'll be redirecting std streams, we do
 755                  * not need the console.
 756                  * It is necessary to use DETACHED_PROCESS
 757                  * instead of CREATE_NO_WINDOW to make ssh
 758                  * recognize that it has no console.
 759                  */
 760                 flags = DETACHED_PROCESS;
 761         } else {
 762                 /* There is already a console. If we specified
 763                  * DETACHED_PROCESS here, too, Windows would
 764                  * disassociate the child from the console.
 765                  * The same is true for CREATE_NO_WINDOW.
 766                  * Go figure!
 767                  */
 768                 flags = 0;
 769                 CloseHandle(cons);
 770         }
 771         memset(&si, 0, sizeof(si));
 772         si.cb = sizeof(si);
 773         si.dwFlags = STARTF_USESTDHANDLES;
 774         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 775         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 776         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 777
 778         /* concatenate argv, quoting args as we go */
 779         strbuf_init(&args, 0);
 780         if (prepend_cmd) {
 781                 char *quoted = (char *)quote_arg(cmd);
 782                 strbuf_addstr(&args, quoted);
 783                 if (quoted != cmd)
 784                         free(quoted);
 785         }
 786         for (; *argv; argv++) {
 787                 char *quoted = (char *)quote_arg(*argv);
 788                 if (*args.buf)
 789                         strbuf_addch(&args, ' ');
 790                 strbuf_addstr(&args, quoted);
 791                 if (quoted != *argv)
 792                         free(quoted);
 793         }
 794
 795         if (env) {
 796                 int count = 0;
 797                 char **e, **sorted_env;
 798
 799                 for (e = env; *e; e++)
 800                         count++;
 801
 802                 /* environment must be sorted */
 803                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 804                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 805                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 806
 807                 strbuf_init(&envblk, 0);
 808                 for (e = sorted_env; *e; e++) {
 809                         strbuf_addstr(&envblk, *e);
 810                         strbuf_addch(&envblk, '\0');
 811                 }
 812                 free(sorted_env);
 813         }
 814
 815         memset(&pi, 0, sizeof(pi));
 816         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 817                 env ? envblk.buf : NULL, dir, &si, &pi);
 818
 819         if (env)
 820                 strbuf_release(&envblk);
 821         strbuf_release(&args);
 822
 823         if (!ret) {
 824                 errno = ENOENT;
 825                 return -1;
 826         }
 827         CloseHandle(pi.hThread);
 828         return (pid_t)pi.hProcess;
 829 }
 830
 831 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 832                            int prepend_cmd)
 833 {
 834         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 835 }
 836
 837 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 838                      const char *dir,
 839                      int fhin, int fhout, int fherr)
 840 {
 841         pid_t pid;
 842         char **path = get_path_split();
 843         char *prog = path_lookup(cmd, path, 0);
 844
 845         if (!prog) {
 846                 errno = ENOENT;
 847                 pid = -1;
 848         }
 849         else {
 850                 const char *interpr = parse_interpreter(prog);
 851
 852                 if (interpr) {
 853                         const char *argv0 = argv[0];
 854                         char *iprog = path_lookup(interpr, path, 1);
 855                         argv[0] = prog;
 856                         if (!iprog) {
 857                                 errno = ENOENT;
 858                                 pid = -1;
 859                         }
 860                         else {
 861                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 862                                                        fhin, fhout, fherr);
 863                                 free(iprog);
 864                         }
 865                         argv[0] = argv0;
 866                 }
 867                 else
 868                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 869                                                fhin, fhout, fherr);
 870                 free(prog);
 871         }
 872         free_path_split(path);
 873         return pid;
 874 }
 875
 876 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 877 {
 878         const char *interpr = parse_interpreter(cmd);
 879         char **path;
 880         char *prog;
 881         int pid = 0;
 882
 883         if (!interpr)
 884                 return 0;
 885         path = get_path_split();
 886         prog = path_lookup(interpr, path, 1);
 887         if (prog) {
 888                 int argc = 0;
 889                 const char **argv2;
 890                 while (argv[argc]) argc++;
 891                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 892                 argv2[0] = (char *)cmd; /* full path to the script file */
 893                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 894                 pid = mingw_spawnve(prog, argv2, env, 1);
 895                 if (pid >= 0) {
 896                         int status;
 897                         if (waitpid(pid, &status, 0) < 0)
 898                                 status = 255;
 899                         exit(status);
 900                 }
 901                 pid = 1;        /* indicate that we tried but failed */
 902                 free(prog);
 903                 free(argv2);
 904         }
 905         free_path_split(path);
 906         return pid;
 907 }
 908
 909 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 910 {
 911         /* check if git_command is a shell script */
 912         if (!try_shell_exec(cmd, argv, (char **)env)) {
 913                 int pid, status;
 914
 915                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 916                 if (pid < 0)
 917                         return;
 918                 if (waitpid(pid, &status, 0) < 0)
 919                         status = 255;
 920                 exit(status);
 921         }
 922 }
 923
 924 void mingw_execvp(const char *cmd, char *const *argv)
 925 {
 926         char **path = get_path_split();
 927         char *prog = path_lookup(cmd, path, 0);
 928
 929         if (prog) {
 930                 mingw_execve(prog, argv, environ);
 931                 free(prog);
 932         } else
 933                 errno = ENOENT;
 934
 935         free_path_split(path);
 936 }
 937
 938 static char **copy_environ(void)
 939 {
 940         char **env;
 941         int i = 0;
 942         while (environ[i])
 943                 i++;
 944         env = xmalloc((i+1)*sizeof(*env));
 945         for (i = 0; environ[i]; i++)
 946                 env[i] = xstrdup(environ[i]);
 947         env[i] = NULL;
 948         return env;
 949 }
 950
 951 void free_environ(char **env)
 952 {
 953         int i;
 954         for (i = 0; env[i]; i++)
 955                 free(env[i]);
 956         free(env);
 957 }
 958
 959 static int lookup_env(char **env, const char *name, size_t nmln)
 960 {
 961         int i;
 962
 963         for (i = 0; env[i]; i++) {
 964                 if (0 == strncmp(env[i], name, nmln)
 965                     && '=' == env[i][nmln])
 966                         /* matches */
 967                         return i;
 968         }
 969         return -1;
 970 }
 971
 972 /*
 973  * If name contains '=', then sets the variable, otherwise it unsets it
 974  */
 975 static char **env_setenv(char **env, const char *name)
 976 {
 977         char *eq = strchrnul(name, '=');
 978         int i = lookup_env(env, name, eq-name);
 979
 980         if (i < 0) {
 981                 if (*eq) {
 982                         for (i = 0; env[i]; i++)
 983                                 ;
 984                         env = xrealloc(env, (i+2)*sizeof(*env));
 985                         env[i] = xstrdup(name);
 986                         env[i+1] = NULL;
 987                 }
 988         }
 989         else {
 990                 free(env[i]);
 991                 if (*eq)
 992                         env[i] = xstrdup(name);
 993                 else
 994                         for (; env[i]; i++)
 995                                 env[i] = env[i+1];
 996         }
 997         return env;
 998 }
 999
1000 /*
1001  * Copies global environ and adjusts variables as specified by vars.
1002  */
1003 char **make_augmented_environ(const char *const *vars)
1004 {
1005         char **env = copy_environ();
1006
1007         while (*vars)
1008                 env = env_setenv(env, *vars++);
1009         return env;
1010 }
1011
1012 /*
1013  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1014  * that service contains a numerical port, or that it it is null. It
1015  * does a simple search using gethostbyname, and returns one IPv4 host
1016  * if one was found.
1017  */
1018 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1019                                    const struct addrinfo *hints,
1020                                    struct addrinfo **res)
1021 {
1022         struct hostent *h = gethostbyname(node);
1023         struct addrinfo *ai;
1024         struct sockaddr_in *sin;
1025
1026         if (!h)
1027                 return WSAGetLastError();
1028
1029         ai = xmalloc(sizeof(struct addrinfo));
1030         *res = ai;
1031         ai->ai_flags = 0;
1032         ai->ai_family = AF_INET;
1033         ai->ai_socktype = hints->ai_socktype;
1034         switch (hints->ai_socktype) {
1035         case SOCK_STREAM:
1036                 ai->ai_protocol = IPPROTO_TCP;
1037                 break;
1038         case SOCK_DGRAM:
1039                 ai->ai_protocol = IPPROTO_UDP;
1040                 break;
1041         default:
1042                 ai->ai_protocol = 0;
1043                 break;
1044         }
1045         ai->ai_addrlen = sizeof(struct sockaddr_in);
1046         ai->ai_canonname = strdup(h->h_name);
1047
1048         sin = xmalloc(ai->ai_addrlen);
1049         memset(sin, 0, ai->ai_addrlen);
1050         sin->sin_family = AF_INET;
1051         if (service)
1052                 sin->sin_port = htons(atoi(service));
1053         sin->sin_addr = *(struct in_addr *)h->h_addr;
1054         ai->ai_addr = (struct sockaddr *)sin;
1055         ai->ai_next = 0;
1056         return 0;
1057 }
1058
1059 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1060 {
1061         free(res->ai_canonname);
1062         free(res->ai_addr);
1063         free(res);
1064 }
1065
1066 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1067                                    char *host, DWORD hostlen,
1068                                    char *serv, DWORD servlen, int flags)
1069 {
1070         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1071         if (sa->sa_family != AF_INET)
1072                 return EAI_FAMILY;
1073         if (!host && !serv)
1074                 return EAI_NONAME;
1075
1076         if (host && hostlen > 0) {
1077                 struct hostent *ent = NULL;
1078                 if (!(flags & NI_NUMERICHOST))
1079                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1080                                             sizeof(sin->sin_addr), AF_INET);
1081
1082                 if (ent)
1083                         snprintf(host, hostlen, "%s", ent->h_name);
1084                 else if (flags & NI_NAMEREQD)
1085                         return EAI_NONAME;
1086                 else
1087                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1088         }
1089
1090         if (serv && servlen > 0) {
1091                 struct servent *ent = NULL;
1092                 if (!(flags & NI_NUMERICSERV))
1093                         ent = getservbyport(sin->sin_port,
1094                                             flags & NI_DGRAM ? "udp" : "tcp");
1095
1096                 if (ent)
1097                         snprintf(serv, servlen, "%s", ent->s_name);
1098                 else
1099                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1100         }
1101
1102         return 0;
1103 }
1104
1105 static HMODULE ipv6_dll = NULL;
1106 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1107 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1108                                       const struct addrinfo *hints,
1109                                       struct addrinfo **res);
1110 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1111                                       char *host, DWORD hostlen,
1112                                       char *serv, DWORD servlen, int flags);
1113 /*
1114  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1115  * don't need to try to load that one dynamically.
1116  */
1117
1118 static void socket_cleanup(void)
1119 {
1120         WSACleanup();
1121         if (ipv6_dll)
1122                 FreeLibrary(ipv6_dll);
1123         ipv6_dll = NULL;
1124         ipv6_freeaddrinfo = freeaddrinfo_stub;
1125         ipv6_getaddrinfo = getaddrinfo_stub;
1126         ipv6_getnameinfo = getnameinfo_stub;
1127 }
1128
1129 static void ensure_socket_initialization(void)
1130 {
1131         WSADATA wsa;
1132         static int initialized = 0;
1133         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1134         const char **name;
1135
1136         if (initialized)
1137                 return;
1138
1139         if (WSAStartup(MAKEWORD(2,2), &wsa))
1140                 die("unable to initialize winsock subsystem, error %d",
1141                         WSAGetLastError());
1142
1143         for (name = libraries; *name; name++) {
1144                 ipv6_dll = LoadLibrary(*name);
1145                 if (!ipv6_dll)
1146                         continue;
1147
1148                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1149                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1150                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1151                                                    const struct addrinfo *,
1152                                                    struct addrinfo **))
1153                         GetProcAddress(ipv6_dll, "getaddrinfo");
1154                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1155                                                    socklen_t, char *, DWORD,
1156                                                    char *, DWORD, int))
1157                         GetProcAddress(ipv6_dll, "getnameinfo");
1158                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1159                         FreeLibrary(ipv6_dll);
1160                         ipv6_dll = NULL;
1161                 } else
1162                         break;
1163         }
1164         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1165                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1166                 ipv6_getaddrinfo = getaddrinfo_stub;
1167                 ipv6_getnameinfo = getnameinfo_stub;
1168         }
1169
1170         atexit(socket_cleanup);
1171         initialized = 1;
1172 }
1173
1174 #undef gethostbyname
1175 struct hostent *mingw_gethostbyname(const char *host)
1176 {
1177         ensure_socket_initialization();
1178         return gethostbyname(host);
1179 }
1180
1181 void mingw_freeaddrinfo(struct addrinfo *res)
1182 {
1183         ipv6_freeaddrinfo(res);
1184 }
1185
1186 int mingw_getaddrinfo(const char *node, const char *service,
1187                       const struct addrinfo *hints, struct addrinfo **res)
1188 {
1189         ensure_socket_initialization();
1190         return ipv6_getaddrinfo(node, service, hints, res);
1191 }
1192
1193 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1194                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1195                       int flags)
1196 {
1197         ensure_socket_initialization();
1198         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1199 }
1200
1201 int mingw_socket(int domain, int type, int protocol)
1202 {
1203         int sockfd;
1204         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1205         if (s == INVALID_SOCKET) {
1206                 /*
1207                  * WSAGetLastError() values are regular BSD error codes
1208                  * biased by WSABASEERR.
1209                  * However, strerror() does not know about networking
1210                  * specific errors, which are values beginning at 38 or so.
1211                  * Therefore, we choose to leave the biased error code
1212                  * in errno so that _if_ someone looks up the code somewhere,
1213                  * then it is at least the number that are usually listed.
1214                  */
1215                 errno = WSAGetLastError();
1216                 return -1;
1217         }
1218         /* convert into a file descriptor */
1219         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1220                 closesocket(s);
1221                 return error("unable to make a socket file descriptor: %s",
1222                         strerror(errno));
1223         }
1224         return sockfd;
1225 }
1226
1227 #undef connect
1228 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1229 {
1230         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1231         return connect(s, sa, sz);
1232 }
1233
1234 #undef rename
1235 int mingw_rename(const char *pold, const char *pnew)
1236 {
1237         DWORD attrs, gle;
1238         int tries = 0;
1239         static const int delay[] = { 0, 1, 10, 20, 40 };
1240
1241         /*
1242          * Try native rename() first to get errno right.
1243          * It is based on MoveFile(), which cannot overwrite existing files.
1244          */
1245         if (!rename(pold, pnew))
1246                 return 0;
1247         if (errno != EEXIST)
1248                 return -1;
1249 repeat:
1250         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1251                 return 0;
1252         /* TODO: translate more errors */
1253         gle = GetLastError();
1254         if (gle == ERROR_ACCESS_DENIED &&
1255             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1256                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1257                         errno = EISDIR;
1258                         return -1;
1259                 }
1260                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1261                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1262                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1263                                 return 0;
1264                         gle = GetLastError();
1265                         /* revert file attributes on failure */
1266                         SetFileAttributes(pnew, attrs);
1267                 }
1268         }
1269         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1270                 /*
1271                  * We assume that some other process had the source or
1272                  * destination file open at the wrong moment and retry.
1273                  * In order to give the other process a higher chance to
1274                  * complete its operation, we give up our time slice now.
1275                  * If we have to retry again, we do sleep a bit.
1276                  */
1277                 Sleep(delay[tries]);
1278                 tries++;
1279                 goto repeat;
1280         }
1281         errno = EACCES;
1282         return -1;
1283 }
1284
1285 /*
1286  * Note that this doesn't return the actual pagesize, but
1287  * the allocation granularity. If future Windows specific git code
1288  * needs the real getpagesize function, we need to find another solution.
1289  */
1290 int mingw_getpagesize(void)
1291 {
1292         SYSTEM_INFO si;
1293         GetSystemInfo(&si);
1294         return si.dwAllocationGranularity;
1295 }
1296
1297 struct passwd *getpwuid(int uid)
1298 {
1299         static char user_name[100];
1300         static struct passwd p;
1301
1302         DWORD len = sizeof(user_name);
1303         if (!GetUserName(user_name, &len))
1304                 return NULL;
1305         p.pw_name = user_name;
1306         p.pw_gecos = "unknown";
1307         p.pw_dir = NULL;
1308         return &p;
1309 }
1310
1311 static HANDLE timer_event;
1312 static HANDLE timer_thread;
1313 static int timer_interval;
1314 static int one_shot;
1315 static sig_handler_t timer_fn = SIG_DFL;
1316
1317 /* The timer works like this:
1318  * The thread, ticktack(), is a trivial routine that most of the time
1319  * only waits to receive the signal to terminate. The main thread tells
1320  * the thread to terminate by setting the timer_event to the signalled
1321  * state.
1322  * But ticktack() interrupts the wait state after the timer's interval
1323  * length to call the signal handler.
1324  */
1325
1326 static unsigned __stdcall ticktack(void *dummy)
1327 {
1328         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1329                 if (timer_fn == SIG_DFL)
1330                         die("Alarm");
1331                 if (timer_fn != SIG_IGN)
1332                         timer_fn(SIGALRM);
1333                 if (one_shot)
1334                         break;
1335         }
1336         return 0;
1337 }
1338
1339 static int start_timer_thread(void)
1340 {
1341         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1342         if (timer_event) {
1343                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1344                 if (!timer_thread )
1345                         return errno = ENOMEM,
1346                                 error("cannot start timer thread");
1347         } else
1348                 return errno = ENOMEM,
1349                         error("cannot allocate resources for timer");
1350         return 0;
1351 }
1352
1353 static void stop_timer_thread(void)
1354 {
1355         if (timer_event)
1356                 SetEvent(timer_event);  /* tell thread to terminate */
1357         if (timer_thread) {
1358                 int rc = WaitForSingleObject(timer_thread, 1000);
1359                 if (rc == WAIT_TIMEOUT)
1360                         error("timer thread did not terminate timely");
1361                 else if (rc != WAIT_OBJECT_0)
1362                         error("waiting for timer thread failed: %lu",
1363                               GetLastError());
1364                 CloseHandle(timer_thread);
1365         }
1366         if (timer_event)
1367                 CloseHandle(timer_event);
1368         timer_event = NULL;
1369         timer_thread = NULL;
1370 }
1371
1372 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1373 {
1374         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1375 }
1376
1377 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1378 {
1379         static const struct timeval zero;
1380         static int atexit_done;
1381
1382         if (out != NULL)
1383                 return errno = EINVAL,
1384                         error("setitimer param 3 != NULL not implemented");
1385         if (!is_timeval_eq(&in->it_interval, &zero) &&
1386             !is_timeval_eq(&in->it_interval, &in->it_value))
1387                 return errno = EINVAL,
1388                         error("setitimer: it_interval must be zero or eq it_value");
1389
1390         if (timer_thread)
1391                 stop_timer_thread();
1392
1393         if (is_timeval_eq(&in->it_value, &zero) &&
1394             is_timeval_eq(&in->it_interval, &zero))
1395                 return 0;
1396
1397         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1398         one_shot = is_timeval_eq(&in->it_interval, &zero);
1399         if (!atexit_done) {
1400                 atexit(stop_timer_thread);
1401                 atexit_done = 1;
1402         }
1403         return start_timer_thread();
1404 }
1405
1406 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1407 {
1408         if (sig != SIGALRM)
1409                 return errno = EINVAL,
1410                         error("sigaction only implemented for SIGALRM");
1411         if (out != NULL)
1412                 return errno = EINVAL,
1413                         error("sigaction: param 3 != NULL not implemented");
1414
1415         timer_fn = in->sa_handler;
1416         return 0;
1417 }
1418
1419 #undef signal
1420 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1421 {
1422         sig_handler_t old = timer_fn;
1423         if (sig != SIGALRM)
1424                 return signal(sig, handler);
1425         timer_fn = handler;
1426         return old;
1427 }
1428
1429 static const char *make_backslash_path(const char *path)
1430 {
1431         static char buf[PATH_MAX + 1];
1432         char *c;
1433
1434         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1435                 die("Too long path: %.*s", 60, path);
1436
1437         for (c = buf; *c; c++) {
1438                 if (*c == '/')
1439                         *c = '\\';
1440         }
1441         return buf;
1442 }
1443
1444 void mingw_open_html(const char *unixpath)
1445 {
1446         const char *htmlpath = make_backslash_path(unixpath);
1447         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1448                         const char *, const char *, const char *, INT);
1449         T ShellExecute;
1450         HMODULE shell32;
1451
1452         shell32 = LoadLibrary("shell32.dll");
1453         if (!shell32)
1454                 die("cannot load shell32.dll");
1455         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1456         if (!ShellExecute)
1457                 die("cannot run browser");
1458
1459         printf("Launching default browser to display HTML ...\n");
1460         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1461
1462         FreeLibrary(shell32);
1463 }
1464
1465 int link(const char *oldpath, const char *newpath)
1466 {
1467         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1468         static T create_hard_link = NULL;
1469         if (!create_hard_link) {
1470                 create_hard_link = (T) GetProcAddress(
1471                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1472                 if (!create_hard_link)
1473                         create_hard_link = (T)-1;
1474         }
1475         if (create_hard_link == (T)-1) {
1476                 errno = ENOSYS;
1477                 return -1;
1478         }
1479         if (!create_hard_link(newpath, oldpath, NULL)) {
1480                 errno = err_win_to_posix(GetLastError());
1481                 return -1;
1482         }
1483         return 0;
1484 }
1485
1486 char *getpass(const char *prompt)
1487 {
1488         struct strbuf buf = STRBUF_INIT;
1489
1490         fputs(prompt, stderr);
1491         for (;;) {
1492                 char c = _getch();
1493                 if (c == '\r' || c == '\n')
1494                         break;
1495                 strbuf_addch(&buf, c);
1496         }
1497         fputs("\n", stderr);
1498         return strbuf_detach(&buf, NULL);
1499 }
1500
1501 #ifndef NO_MINGW_REPLACE_READDIR
1502 /* MinGW readdir implementation to avoid extra lstats for Git */
1503 struct mingw_DIR
1504 {
1505         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1506         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1507         long                    dd_handle;      /* _findnext handle */
1508         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1509         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1510 };
1511
1512 struct dirent *mingw_readdir(DIR *dir)
1513 {
1514         WIN32_FIND_DATAA buf;
1515         HANDLE handle;
1516         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1517
1518         if (!dir->dd_handle) {
1519                 errno = EBADF; /* No set_errno for mingw */
1520                 return NULL;
1521         }
1522
1523         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1524         {
1525                 DWORD lasterr;
1526                 handle = FindFirstFileA(dir->dd_name, &buf);
1527                 lasterr = GetLastError();
1528                 dir->dd_handle = (long)handle;
1529                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1530                         errno = err_win_to_posix(lasterr);
1531                         return NULL;
1532                 }
1533         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1534                 return NULL;
1535         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1536                 DWORD lasterr = GetLastError();
1537                 FindClose((HANDLE)dir->dd_handle);
1538                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1539                 /* POSIX says you shouldn't set errno when readdir can't
1540                    find any more files; so, if another error we leave it set. */
1541                 if (lasterr != ERROR_NO_MORE_FILES)
1542                         errno = err_win_to_posix(lasterr);
1543                 return NULL;
1544         }
1545
1546         /* We get here if `buf' contains valid data.  */
1547         strcpy(dir->dd_dir.d_name, buf.cFileName);
1548         ++dir->dd_stat;
1549
1550         /* Set file type, based on WIN32_FIND_DATA */
1551         mdir->dd_dir.d_type = 0;
1552         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1553                 mdir->dd_dir.d_type |= DT_DIR;
1554         else
1555                 mdir->dd_dir.d_type |= DT_REG;
1556
1557         return (struct dirent*)&dir->dd_dir;
1558 }
1559 #endif // !NO_MINGW_REPLACE_READDIR