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