compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5
   6 int err_win_to_posix(DWORD winerr)
   7 {
   8         int error = ENOSYS;
   9         switch(winerr) {
  10         case ERROR_ACCESS_DENIED: error = EACCES; break;
  11         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  12         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  13         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  14         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  15         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  16         case ERROR_BAD_COMMAND: error = EIO; break;
  17         case ERROR_BAD_DEVICE: error = ENODEV; break;
  18         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  19         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  20         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  21         case ERROR_BAD_LENGTH: error = EINVAL; break;
  22         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  23         case ERROR_BAD_PIPE: error = EPIPE; break;
  24         case ERROR_BAD_UNIT: error = ENODEV; break;
  25         case ERROR_BAD_USERNAME: error = EINVAL; break;
  26         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  27         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  28         case ERROR_BUSY: error = EBUSY; break;
  29         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  30         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  31         case ERROR_CANNOT_MAKE: error = EACCES; break;
  32         case ERROR_CANTOPEN: error = EIO; break;
  33         case ERROR_CANTREAD: error = EIO; break;
  34         case ERROR_CANTWRITE: error = EIO; break;
  35         case ERROR_CRC: error = EIO; break;
  36         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  37         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  38         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  39         case ERROR_DIRECTORY: error = EINVAL; break;
  40         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  41         case ERROR_DISK_CHANGE: error = EIO; break;
  42         case ERROR_DISK_FULL: error = ENOSPC; break;
  43         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  44         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  45         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  46         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  47         case ERROR_FILE_EXISTS: error = EEXIST; break;
  48         case ERROR_FILE_INVALID: error = ENODEV; break;
  49         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  50         case ERROR_GEN_FAILURE: error = EIO; break;
  51         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  52         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  53         case ERROR_INVALID_ACCESS: error = EACCES; break;
  54         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  55         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  56         case ERROR_INVALID_DATA: error = EINVAL; break;
  57         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  58         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  59         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  60         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  61         case ERROR_INVALID_HANDLE: error = EBADF; break;
  62         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  63         case ERROR_INVALID_NAME: error = EINVAL; break;
  64         case ERROR_INVALID_OWNER: error = EINVAL; break;
  65         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  66         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  67         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  68         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  69         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  70         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  71         case ERROR_IO_DEVICE: error = EIO; break;
  72         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  73         case ERROR_LOCKED: error = EBUSY; break;
  74         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  75         case ERROR_LOGON_FAILURE: error = EACCES; break;
  76         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  77         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  78         case ERROR_MORE_DATA: error = EPIPE; break;
  79         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  80         case ERROR_NOACCESS: error = EFAULT; break;
  81         case ERROR_NONE_MAPPED: error = EINVAL; break;
  82         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  83         case ERROR_NOT_READY: error = EAGAIN; break;
  84         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  85         case ERROR_NO_DATA: error = EPIPE; break;
  86         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  87         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  88         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  89         case ERROR_OPEN_FAILED: error = EIO; break;
  90         case ERROR_OPEN_FILES: error = EBUSY; break;
  91         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  92         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  93         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  94         case ERROR_PATH_BUSY: error = EBUSY; break;
  95         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  96         case ERROR_PIPE_BUSY: error = EBUSY; break;
  97         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
  98         case ERROR_PIPE_LISTENING: error = EPIPE; break;
  99         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 100         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 101         case ERROR_READ_FAULT: error = EIO; break;
 102         case ERROR_SEEK: error = EIO; break;
 103         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 104         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 105         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 106         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 107         case ERROR_SWAPERROR: error = ENOENT; break;
 108         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 109         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 110         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 111         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 112         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 113         case ERROR_WRITE_FAULT: error = EIO; break;
 114         case ERROR_WRITE_PROTECT: error = EROFS; break;
 115         }
 116         return error;
 117 }
 118
 119 #undef open
 120 int mingw_open (const char *filename, int oflags, ...)
 121 {
 122         va_list args;
 123         unsigned mode;
 124         int fd;
 125
 126         va_start(args, oflags);
 127         mode = va_arg(args, int);
 128         va_end(args);
 129
 130         if (filename && !strcmp(filename, "/dev/null"))
 131                 filename = "nul";
 132
 133         fd = open(filename, oflags, mode);
 134
 135         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 136                 DWORD attrs = GetFileAttributes(filename);
 137                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 138                         errno = EISDIR;
 139         }
 140         return fd;
 141 }
 142
 143 #undef write
 144 ssize_t mingw_write(int fd, const void *buf, size_t count)
 145 {
 146         /*
 147          * While write() calls to a file on a local disk are translated
 148          * into WriteFile() calls with a maximum size of 64KB on Windows
 149          * XP and 256KB on Vista, no such cap is placed on writes to
 150          * files over the network on Windows XP.  Unfortunately, there
 151          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 152          * bigger writes fail on Windows XP.
 153          * So we cap to a nice 31MB here to avoid write failures over
 154          * the net without changing the number of WriteFile() calls in
 155          * the local case.
 156          */
 157         return write(fd, buf, min(count, 31 * 1024 * 1024));
 158 }
 159
 160 #undef fopen
 161 FILE *mingw_fopen (const char *filename, const char *otype)
 162 {
 163         if (filename && !strcmp(filename, "/dev/null"))
 164                 filename = "nul";
 165         return fopen(filename, otype);
 166 }
 167
 168 #undef freopen
 169 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 170 {
 171         if (filename && !strcmp(filename, "/dev/null"))
 172                 filename = "nul";
 173         return freopen(filename, otype, stream);
 174 }
 175
 176 /*
 177  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 178  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 179  */
 180 static inline long long filetime_to_hnsec(const FILETIME *ft)
 181 {
 182         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 183         /* Windows to Unix Epoch conversion */
 184         return winTime - 116444736000000000LL;
 185 }
 186
 187 static inline time_t filetime_to_time_t(const FILETIME *ft)
 188 {
 189         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 190 }
 191
 192 /* We keep the do_lstat code in a separate function to avoid recursion.
 193  * When a path ends with a slash, the stat will fail with ENOENT. In
 194  * this case, we strip the trailing slashes and stat again.
 195  *
 196  * If follow is true then act like stat() and report on the link
 197  * target. Otherwise report on the link itself.
 198  */
 199 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 200 {
 201         WIN32_FILE_ATTRIBUTE_DATA fdata;
 202
 203         if (!(errno = get_file_attr(file_name, &fdata))) {
 204                 buf->st_ino = 0;
 205                 buf->st_gid = 0;
 206                 buf->st_uid = 0;
 207                 buf->st_nlink = 1;
 208                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 209                 buf->st_size = fdata.nFileSizeLow |
 210                         (((off_t)fdata.nFileSizeHigh)<<32);
 211                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 212                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 213                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 214                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 215                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 216                         WIN32_FIND_DATAA findbuf;
 217                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 218                         if (handle != INVALID_HANDLE_VALUE) {
 219                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 220                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 221                                         if (follow) {
 222                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 223                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 224                                         } else {
 225                                                 buf->st_mode = S_IFLNK;
 226                                         }
 227                                         buf->st_mode |= S_IREAD;
 228                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 229                                                 buf->st_mode |= S_IWRITE;
 230                                 }
 231                                 FindClose(handle);
 232                         }
 233                 }
 234                 return 0;
 235         }
 236         return -1;
 237 }
 238
 239 /* We provide our own lstat/fstat functions, since the provided
 240  * lstat/fstat functions are so slow. These stat functions are
 241  * tailored for Git's usage (read: fast), and are not meant to be
 242  * complete. Note that Git stat()s are redirected to mingw_lstat()
 243  * too, since Windows doesn't really handle symlinks that well.
 244  */
 245 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 246 {
 247         int namelen;
 248         static char alt_name[PATH_MAX];
 249
 250         if (!do_lstat(follow, file_name, buf))
 251                 return 0;
 252
 253         /* if file_name ended in a '/', Windows returned ENOENT;
 254          * try again without trailing slashes
 255          */
 256         if (errno != ENOENT)
 257                 return -1;
 258
 259         namelen = strlen(file_name);
 260         if (namelen && file_name[namelen-1] != '/')
 261                 return -1;
 262         while (namelen && file_name[namelen-1] == '/')
 263                 --namelen;
 264         if (!namelen || namelen >= PATH_MAX)
 265                 return -1;
 266
 267         memcpy(alt_name, file_name, namelen);
 268         alt_name[namelen] = 0;
 269         return do_lstat(follow, alt_name, buf);
 270 }
 271
 272 int mingw_lstat(const char *file_name, struct stat *buf)
 273 {
 274         return do_stat_internal(0, file_name, buf);
 275 }
 276 int mingw_stat(const char *file_name, struct stat *buf)
 277 {
 278         return do_stat_internal(1, file_name, buf);
 279 }
 280
 281 #undef fstat
 282 int mingw_fstat(int fd, struct stat *buf)
 283 {
 284         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 285         BY_HANDLE_FILE_INFORMATION fdata;
 286
 287         if (fh == INVALID_HANDLE_VALUE) {
 288                 errno = EBADF;
 289                 return -1;
 290         }
 291         /* direct non-file handles to MS's fstat() */
 292         if (GetFileType(fh) != FILE_TYPE_DISK)
 293                 return _fstati64(fd, buf);
 294
 295         if (GetFileInformationByHandle(fh, &fdata)) {
 296                 buf->st_ino = 0;
 297                 buf->st_gid = 0;
 298                 buf->st_uid = 0;
 299                 buf->st_nlink = 1;
 300                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 301                 buf->st_size = fdata.nFileSizeLow |
 302                         (((off_t)fdata.nFileSizeHigh)<<32);
 303                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 304                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 305                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 306                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 307                 return 0;
 308         }
 309         errno = EBADF;
 310         return -1;
 311 }
 312
 313 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 314 {
 315         long long winTime = t * 10000000LL + 116444736000000000LL;
 316         ft->dwLowDateTime = winTime;
 317         ft->dwHighDateTime = winTime >> 32;
 318 }
 319
 320 int mingw_utime (const char *file_name, const struct utimbuf *times)
 321 {
 322         FILETIME mft, aft;
 323         int fh, rc;
 324
 325         /* must have write permission */
 326         DWORD attrs = GetFileAttributes(file_name);
 327         if (attrs != INVALID_FILE_ATTRIBUTES &&
 328             (attrs & FILE_ATTRIBUTE_READONLY)) {
 329                 /* ignore errors here; open() will report them */
 330                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 331         }
 332
 333         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 334                 rc = -1;
 335                 goto revert_attrs;
 336         }
 337
 338         if (times) {
 339                 time_t_to_filetime(times->modtime, &mft);
 340                 time_t_to_filetime(times->actime, &aft);
 341         } else {
 342                 GetSystemTimeAsFileTime(&mft);
 343                 aft = mft;
 344         }
 345         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 346                 errno = EINVAL;
 347                 rc = -1;
 348         } else
 349                 rc = 0;
 350         close(fh);
 351
 352 revert_attrs:
 353         if (attrs != INVALID_FILE_ATTRIBUTES &&
 354             (attrs & FILE_ATTRIBUTE_READONLY)) {
 355                 /* ignore errors again */
 356                 SetFileAttributes(file_name, attrs);
 357         }
 358         return rc;
 359 }
 360
 361 unsigned int sleep (unsigned int seconds)
 362 {
 363         Sleep(seconds*1000);
 364         return 0;
 365 }
 366
 367 int mkstemp(char *template)
 368 {
 369         char *filename = mktemp(template);
 370         if (filename == NULL)
 371                 return -1;
 372         return open(filename, O_RDWR | O_CREAT, 0600);
 373 }
 374
 375 int gettimeofday(struct timeval *tv, void *tz)
 376 {
 377         FILETIME ft;
 378         long long hnsec;
 379
 380         GetSystemTimeAsFileTime(&ft);
 381         hnsec = filetime_to_hnsec(&ft);
 382         tv->tv_sec = hnsec / 10000000;
 383         tv->tv_usec = (hnsec % 10000000) / 10;
 384         return 0;
 385 }
 386
 387 int pipe(int filedes[2])
 388 {
 389         HANDLE h[2];
 390
 391         /* this creates non-inheritable handles */
 392         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 393                 errno = err_win_to_posix(GetLastError());
 394                 return -1;
 395         }
 396         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 397         if (filedes[0] < 0) {
 398                 CloseHandle(h[0]);
 399                 CloseHandle(h[1]);
 400                 return -1;
 401         }
 402         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 403         if (filedes[0] < 0) {
 404                 close(filedes[0]);
 405                 CloseHandle(h[1]);
 406                 return -1;
 407         }
 408         return 0;
 409 }
 410
 411 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 412 {
 413         int i, pending;
 414
 415         if (timeout >= 0) {
 416                 if (nfds == 0) {
 417                         Sleep(timeout);
 418                         return 0;
 419                 }
 420                 return errno = EINVAL, error("poll timeout not supported");
 421         }
 422
 423         /* When there is only one fd to wait for, then we pretend that
 424          * input is available and let the actual wait happen when the
 425          * caller invokes read().
 426          */
 427         if (nfds == 1) {
 428                 if (!(ufds[0].events & POLLIN))
 429                         return errno = EINVAL, error("POLLIN not set");
 430                 ufds[0].revents = POLLIN;
 431                 return 0;
 432         }
 433
 434 repeat:
 435         pending = 0;
 436         for (i = 0; i < nfds; i++) {
 437                 DWORD avail = 0;
 438                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 439                 if (h == INVALID_HANDLE_VALUE)
 440                         return -1;      /* errno was set */
 441
 442                 if (!(ufds[i].events & POLLIN))
 443                         return errno = EINVAL, error("POLLIN not set");
 444
 445                 /* this emulation works only for pipes */
 446                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 447                         int err = GetLastError();
 448                         if (err == ERROR_BROKEN_PIPE) {
 449                                 ufds[i].revents = POLLHUP;
 450                                 pending++;
 451                         } else {
 452                                 errno = EINVAL;
 453                                 return error("PeekNamedPipe failed,"
 454                                         " GetLastError: %u", err);
 455                         }
 456                 } else if (avail) {
 457                         ufds[i].revents = POLLIN;
 458                         pending++;
 459                 } else
 460                         ufds[i].revents = 0;
 461         }
 462         if (!pending) {
 463                 /* The only times that we spin here is when the process
 464                  * that is connected through the pipes is waiting for
 465                  * its own input data to become available. But since
 466                  * the process (pack-objects) is itself CPU intensive,
 467                  * it will happily pick up the time slice that we are
 468                  * relinquishing here.
 469                  */
 470                 Sleep(0);
 471                 goto repeat;
 472         }
 473         return 0;
 474 }
 475
 476 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 477 {
 478         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 479         memcpy(result, gmtime(timep), sizeof(struct tm));
 480         return result;
 481 }
 482
 483 struct tm *localtime_r(const time_t *timep, struct tm *result)
 484 {
 485         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 486         memcpy(result, localtime(timep), sizeof(struct tm));
 487         return result;
 488 }
 489
 490 #undef getcwd
 491 char *mingw_getcwd(char *pointer, int len)
 492 {
 493         int i;
 494         char *ret = getcwd(pointer, len);
 495         if (!ret)
 496                 return ret;
 497         for (i = 0; pointer[i]; i++)
 498                 if (pointer[i] == '\\')
 499                         pointer[i] = '/';
 500         return ret;
 501 }
 502
 503 #undef getenv
 504 char *mingw_getenv(const char *name)
 505 {
 506         char *result = getenv(name);
 507         if (!result && !strcmp(name, "TMPDIR")) {
 508                 /* on Windows it is TMP and TEMP */
 509                 result = getenv("TMP");
 510                 if (!result)
 511                         result = getenv("TEMP");
 512         }
 513         return result;
 514 }
 515
 516 /*
 517  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 518  * (Parsing C++ Command-Line Arguments)
 519  */
 520 static const char *quote_arg(const char *arg)
 521 {
 522         /* count chars to quote */
 523         int len = 0, n = 0;
 524         int force_quotes = 0;
 525         char *q, *d;
 526         const char *p = arg;
 527         if (!*p) force_quotes = 1;
 528         while (*p) {
 529                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 530                         force_quotes = 1;
 531                 else if (*p == '"')
 532                         n++;
 533                 else if (*p == '\\') {
 534                         int count = 0;
 535                         while (*p == '\\') {
 536                                 count++;
 537                                 p++;
 538                                 len++;
 539                         }
 540                         if (*p == '"')
 541                                 n += count*2 + 1;
 542                         continue;
 543                 }
 544                 len++;
 545                 p++;
 546         }
 547         if (!force_quotes && n == 0)
 548                 return arg;
 549
 550         /* insert \ where necessary */
 551         d = q = xmalloc(len+n+3);
 552         *d++ = '"';
 553         while (*arg) {
 554                 if (*arg == '"')
 555                         *d++ = '\\';
 556                 else if (*arg == '\\') {
 557                         int count = 0;
 558                         while (*arg == '\\') {
 559                                 count++;
 560                                 *d++ = *arg++;
 561                         }
 562                         if (*arg == '"') {
 563                                 while (count-- > 0)
 564                                         *d++ = '\\';
 565                                 *d++ = '\\';
 566                         }
 567                 }
 568                 *d++ = *arg++;
 569         }
 570         *d++ = '"';
 571         *d++ = 0;
 572         return q;
 573 }
 574
 575 static const char *parse_interpreter(const char *cmd)
 576 {
 577         static char buf[100];
 578         char *p, *opt;
 579         int n, fd;
 580
 581         /* don't even try a .exe */
 582         n = strlen(cmd);
 583         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 584                 return NULL;
 585
 586         fd = open(cmd, O_RDONLY);
 587         if (fd < 0)
 588                 return NULL;
 589         n = read(fd, buf, sizeof(buf)-1);
 590         close(fd);
 591         if (n < 4)      /* at least '#!/x' and not error */
 592                 return NULL;
 593
 594         if (buf[0] != '#' || buf[1] != '!')
 595                 return NULL;
 596         buf[n] = '\0';
 597         p = buf + strcspn(buf, "\r\n");
 598         if (!*p)
 599                 return NULL;
 600
 601         *p = '\0';
 602         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 603                 return NULL;
 604         /* strip options */
 605         if ((opt = strchr(p+1, ' ')))
 606                 *opt = '\0';
 607         return p+1;
 608 }
 609
 610 /*
 611  * Splits the PATH into parts.
 612  */
 613 static char **get_path_split(void)
 614 {
 615         char *p, **path, *envpath = getenv("PATH");
 616         int i, n = 0;
 617
 618         if (!envpath || !*envpath)
 619                 return NULL;
 620
 621         envpath = xstrdup(envpath);
 622         p = envpath;
 623         while (p) {
 624                 char *dir = p;
 625                 p = strchr(p, ';');
 626                 if (p) *p++ = '\0';
 627                 if (*dir) {     /* not earlier, catches series of ; */
 628                         ++n;
 629                 }
 630         }
 631         if (!n)
 632                 return NULL;
 633
 634         path = xmalloc((n+1)*sizeof(char *));
 635         p = envpath;
 636         i = 0;
 637         do {
 638                 if (*p)
 639                         path[i++] = xstrdup(p);
 640                 p = p+strlen(p)+1;
 641         } while (i < n);
 642         path[i] = NULL;
 643
 644         free(envpath);
 645
 646         return path;
 647 }
 648
 649 static void free_path_split(char **path)
 650 {
 651         char **p = path;
 652
 653         if (!path)
 654                 return;
 655
 656         while (*p)
 657                 free(*p++);
 658         free(path);
 659 }
 660
 661 /*
 662  * exe_only means that we only want to detect .exe files, but not scripts
 663  * (which do not have an extension)
 664  */
 665 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 666 {
 667         char path[MAX_PATH];
 668         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 669
 670         if (!isexe && access(path, F_OK) == 0)
 671                 return xstrdup(path);
 672         path[strlen(path)-4] = '\0';
 673         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 674                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 675                         return xstrdup(path);
 676         return NULL;
 677 }
 678
 679 /*
 680  * Determines the absolute path of cmd using the split path in path.
 681  * If cmd contains a slash or backslash, no lookup is performed.
 682  */
 683 static char *path_lookup(const char *cmd, char **path, int exe_only)
 684 {
 685         char *prog = NULL;
 686         int len = strlen(cmd);
 687         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 688
 689         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 690                 prog = xstrdup(cmd);
 691
 692         while (!prog && *path)
 693                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 694
 695         return prog;
 696 }
 697
 698 static int env_compare(const void *a, const void *b)
 699 {
 700         char *const *ea = a;
 701         char *const *eb = b;
 702         return strcasecmp(*ea, *eb);
 703 }
 704
 705 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 706                               const char *dir,
 707                               int prepend_cmd, int fhin, int fhout, int fherr)
 708 {
 709         STARTUPINFO si;
 710         PROCESS_INFORMATION pi;
 711         struct strbuf envblk, args;
 712         unsigned flags;
 713         BOOL ret;
 714
 715         /* Determine whether or not we are associated to a console */
 716         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 717                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 718                         FILE_ATTRIBUTE_NORMAL, NULL);
 719         if (cons == INVALID_HANDLE_VALUE) {
 720                 /* There is no console associated with this process.
 721                  * Since the child is a console process, Windows
 722                  * would normally create a console window. But
 723                  * since we'll be redirecting std streams, we do
 724                  * not need the console.
 725                  * It is necessary to use DETACHED_PROCESS
 726                  * instead of CREATE_NO_WINDOW to make ssh
 727                  * recognize that it has no console.
 728                  */
 729                 flags = DETACHED_PROCESS;
 730         } else {
 731                 /* There is already a console. If we specified
 732                  * DETACHED_PROCESS here, too, Windows would
 733                  * disassociate the child from the console.
 734                  * The same is true for CREATE_NO_WINDOW.
 735                  * Go figure!
 736                  */
 737                 flags = 0;
 738                 CloseHandle(cons);
 739         }
 740         memset(&si, 0, sizeof(si));
 741         si.cb = sizeof(si);
 742         si.dwFlags = STARTF_USESTDHANDLES;
 743         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 744         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 745         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 746
 747         /* concatenate argv, quoting args as we go */
 748         strbuf_init(&args, 0);
 749         if (prepend_cmd) {
 750                 char *quoted = (char *)quote_arg(cmd);
 751                 strbuf_addstr(&args, quoted);
 752                 if (quoted != cmd)
 753                         free(quoted);
 754         }
 755         for (; *argv; argv++) {
 756                 char *quoted = (char *)quote_arg(*argv);
 757                 if (*args.buf)
 758                         strbuf_addch(&args, ' ');
 759                 strbuf_addstr(&args, quoted);
 760                 if (quoted != *argv)
 761                         free(quoted);
 762         }
 763
 764         if (env) {
 765                 int count = 0;
 766                 char **e, **sorted_env;
 767
 768                 for (e = env; *e; e++)
 769                         count++;
 770
 771                 /* environment must be sorted */
 772                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 773                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 774                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 775
 776                 strbuf_init(&envblk, 0);
 777                 for (e = sorted_env; *e; e++) {
 778                         strbuf_addstr(&envblk, *e);
 779                         strbuf_addch(&envblk, '\0');
 780                 }
 781                 free(sorted_env);
 782         }
 783
 784         memset(&pi, 0, sizeof(pi));
 785         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 786                 env ? envblk.buf : NULL, dir, &si, &pi);
 787
 788         if (env)
 789                 strbuf_release(&envblk);
 790         strbuf_release(&args);
 791
 792         if (!ret) {
 793                 errno = ENOENT;
 794                 return -1;
 795         }
 796         CloseHandle(pi.hThread);
 797         return (pid_t)pi.hProcess;
 798 }
 799
 800 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 801                            int prepend_cmd)
 802 {
 803         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 804 }
 805
 806 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 807                      const char *dir,
 808                      int fhin, int fhout, int fherr)
 809 {
 810         pid_t pid;
 811         char **path = get_path_split();
 812         char *prog = path_lookup(cmd, path, 0);
 813
 814         if (!prog) {
 815                 errno = ENOENT;
 816                 pid = -1;
 817         }
 818         else {
 819                 const char *interpr = parse_interpreter(prog);
 820
 821                 if (interpr) {
 822                         const char *argv0 = argv[0];
 823                         char *iprog = path_lookup(interpr, path, 1);
 824                         argv[0] = prog;
 825                         if (!iprog) {
 826                                 errno = ENOENT;
 827                                 pid = -1;
 828                         }
 829                         else {
 830                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 831                                                        fhin, fhout, fherr);
 832                                 free(iprog);
 833                         }
 834                         argv[0] = argv0;
 835                 }
 836                 else
 837                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 838                                                fhin, fhout, fherr);
 839                 free(prog);
 840         }
 841         free_path_split(path);
 842         return pid;
 843 }
 844
 845 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 846 {
 847         const char *interpr = parse_interpreter(cmd);
 848         char **path;
 849         char *prog;
 850         int pid = 0;
 851
 852         if (!interpr)
 853                 return 0;
 854         path = get_path_split();
 855         prog = path_lookup(interpr, path, 1);
 856         if (prog) {
 857                 int argc = 0;
 858                 const char **argv2;
 859                 while (argv[argc]) argc++;
 860                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 861                 argv2[0] = (char *)cmd; /* full path to the script file */
 862                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 863                 pid = mingw_spawnve(prog, argv2, env, 1);
 864                 if (pid >= 0) {
 865                         int status;
 866                         if (waitpid(pid, &status, 0) < 0)
 867                                 status = 255;
 868                         exit(status);
 869                 }
 870                 pid = 1;        /* indicate that we tried but failed */
 871                 free(prog);
 872                 free(argv2);
 873         }
 874         free_path_split(path);
 875         return pid;
 876 }
 877
 878 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 879 {
 880         /* check if git_command is a shell script */
 881         if (!try_shell_exec(cmd, argv, (char **)env)) {
 882                 int pid, status;
 883
 884                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 885                 if (pid < 0)
 886                         return;
 887                 if (waitpid(pid, &status, 0) < 0)
 888                         status = 255;
 889                 exit(status);
 890         }
 891 }
 892
 893 void mingw_execvp(const char *cmd, char *const *argv)
 894 {
 895         char **path = get_path_split();
 896         char *prog = path_lookup(cmd, path, 0);
 897
 898         if (prog) {
 899                 mingw_execve(prog, argv, environ);
 900                 free(prog);
 901         } else
 902                 errno = ENOENT;
 903
 904         free_path_split(path);
 905 }
 906
 907 void mingw_execv(const char *cmd, char *const *argv)
 908 {
 909         mingw_execve(cmd, argv, environ);
 910 }
 911
 912 static char **copy_environ(void)
 913 {
 914         char **env;
 915         int i = 0;
 916         while (environ[i])
 917                 i++;
 918         env = xmalloc((i+1)*sizeof(*env));
 919         for (i = 0; environ[i]; i++)
 920                 env[i] = xstrdup(environ[i]);
 921         env[i] = NULL;
 922         return env;
 923 }
 924
 925 void free_environ(char **env)
 926 {
 927         int i;
 928         for (i = 0; env[i]; i++)
 929                 free(env[i]);
 930         free(env);
 931 }
 932
 933 static int lookup_env(char **env, const char *name, size_t nmln)
 934 {
 935         int i;
 936
 937         for (i = 0; env[i]; i++) {
 938                 if (0 == strncmp(env[i], name, nmln)
 939                     && '=' == env[i][nmln])
 940                         /* matches */
 941                         return i;
 942         }
 943         return -1;
 944 }
 945
 946 /*
 947  * If name contains '=', then sets the variable, otherwise it unsets it
 948  */
 949 static char **env_setenv(char **env, const char *name)
 950 {
 951         char *eq = strchrnul(name, '=');
 952         int i = lookup_env(env, name, eq-name);
 953
 954         if (i < 0) {
 955                 if (*eq) {
 956                         for (i = 0; env[i]; i++)
 957                                 ;
 958                         env = xrealloc(env, (i+2)*sizeof(*env));
 959                         env[i] = xstrdup(name);
 960                         env[i+1] = NULL;
 961                 }
 962         }
 963         else {
 964                 free(env[i]);
 965                 if (*eq)
 966                         env[i] = xstrdup(name);
 967                 else
 968                         for (; env[i]; i++)
 969                                 env[i] = env[i+1];
 970         }
 971         return env;
 972 }
 973
 974 /*
 975  * Copies global environ and adjusts variables as specified by vars.
 976  */
 977 char **make_augmented_environ(const char *const *vars)
 978 {
 979         char **env = copy_environ();
 980
 981         while (*vars)
 982                 env = env_setenv(env, *vars++);
 983         return env;
 984 }
 985
 986 /*
 987  * Note, this isn't a complete replacement for getaddrinfo. It assumes
 988  * that service contains a numerical port, or that it it is null. It
 989  * does a simple search using gethostbyname, and returns one IPv4 host
 990  * if one was found.
 991  */
 992 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 993                                    const struct addrinfo *hints,
 994                                    struct addrinfo **res)
 995 {
 996         struct hostent *h = gethostbyname(node);
 997         struct addrinfo *ai;
 998         struct sockaddr_in *sin;
 999
1000         if (!h)
1001                 return WSAGetLastError();
1002
1003         ai = xmalloc(sizeof(struct addrinfo));
1004         *res = ai;
1005         ai->ai_flags = 0;
1006         ai->ai_family = AF_INET;
1007         ai->ai_socktype = hints->ai_socktype;
1008         switch (hints->ai_socktype) {
1009         case SOCK_STREAM:
1010                 ai->ai_protocol = IPPROTO_TCP;
1011                 break;
1012         case SOCK_DGRAM:
1013                 ai->ai_protocol = IPPROTO_UDP;
1014                 break;
1015         default:
1016                 ai->ai_protocol = 0;
1017                 break;
1018         }
1019         ai->ai_addrlen = sizeof(struct sockaddr_in);
1020         ai->ai_canonname = strdup(h->h_name);
1021
1022         sin = xmalloc(ai->ai_addrlen);
1023         memset(sin, 0, ai->ai_addrlen);
1024         sin->sin_family = AF_INET;
1025         if (service)
1026                 sin->sin_port = htons(atoi(service));
1027         sin->sin_addr = *(struct in_addr *)h->h_addr;
1028         ai->ai_addr = (struct sockaddr *)sin;
1029         ai->ai_next = 0;
1030         return 0;
1031 }
1032
1033 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1034 {
1035         free(res->ai_canonname);
1036         free(res->ai_addr);
1037         free(res);
1038 }
1039
1040 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1041                                    char *host, DWORD hostlen,
1042                                    char *serv, DWORD servlen, int flags)
1043 {
1044         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1045         if (sa->sa_family != AF_INET)
1046                 return EAI_FAMILY;
1047         if (!host && !serv)
1048                 return EAI_NONAME;
1049
1050         if (host && hostlen > 0) {
1051                 struct hostent *ent = NULL;
1052                 if (!(flags & NI_NUMERICHOST))
1053                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1054                                             sizeof(sin->sin_addr), AF_INET);
1055
1056                 if (ent)
1057                         snprintf(host, hostlen, "%s", ent->h_name);
1058                 else if (flags & NI_NAMEREQD)
1059                         return EAI_NONAME;
1060                 else
1061                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1062         }
1063
1064         if (serv && servlen > 0) {
1065                 struct servent *ent = NULL;
1066                 if (!(flags & NI_NUMERICSERV))
1067                         ent = getservbyport(sin->sin_port,
1068                                             flags & NI_DGRAM ? "udp" : "tcp");
1069
1070                 if (ent)
1071                         snprintf(serv, servlen, "%s", ent->s_name);
1072                 else
1073                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1074         }
1075
1076         return 0;
1077 }
1078
1079 static HMODULE ipv6_dll = NULL;
1080 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1081 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1082                                       const struct addrinfo *hints,
1083                                       struct addrinfo **res);
1084 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1085                                       char *host, DWORD hostlen,
1086                                       char *serv, DWORD servlen, int flags);
1087 /*
1088  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1089  * don't need to try to load that one dynamically.
1090  */
1091
1092 static void socket_cleanup(void)
1093 {
1094         WSACleanup();
1095         if (ipv6_dll)
1096                 FreeLibrary(ipv6_dll);
1097         ipv6_dll = NULL;
1098         ipv6_freeaddrinfo = freeaddrinfo_stub;
1099         ipv6_getaddrinfo = getaddrinfo_stub;
1100         ipv6_getnameinfo = getnameinfo_stub;
1101 }
1102
1103 static void ensure_socket_initialization(void)
1104 {
1105         WSADATA wsa;
1106         static int initialized = 0;
1107         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1108         const char **name;
1109
1110         if (initialized)
1111                 return;
1112
1113         if (WSAStartup(MAKEWORD(2,2), &wsa))
1114                 die("unable to initialize winsock subsystem, error %d",
1115                         WSAGetLastError());
1116
1117         for (name = libraries; *name; name++) {
1118                 ipv6_dll = LoadLibrary(*name);
1119                 if (!ipv6_dll)
1120                         continue;
1121
1122                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1123                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1124                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1125                                                    const struct addrinfo *,
1126                                                    struct addrinfo **))
1127                         GetProcAddress(ipv6_dll, "getaddrinfo");
1128                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1129                                                    socklen_t, char *, DWORD,
1130                                                    char *, DWORD, int))
1131                         GetProcAddress(ipv6_dll, "getnameinfo");
1132                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1133                         FreeLibrary(ipv6_dll);
1134                         ipv6_dll = NULL;
1135                 } else
1136                         break;
1137         }
1138         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1139                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1140                 ipv6_getaddrinfo = getaddrinfo_stub;
1141                 ipv6_getnameinfo = getnameinfo_stub;
1142         }
1143
1144         atexit(socket_cleanup);
1145         initialized = 1;
1146 }
1147
1148 #undef gethostbyname
1149 struct hostent *mingw_gethostbyname(const char *host)
1150 {
1151         ensure_socket_initialization();
1152         return gethostbyname(host);
1153 }
1154
1155 void mingw_freeaddrinfo(struct addrinfo *res)
1156 {
1157         ipv6_freeaddrinfo(res);
1158 }
1159
1160 int mingw_getaddrinfo(const char *node, const char *service,
1161                       const struct addrinfo *hints, struct addrinfo **res)
1162 {
1163         ensure_socket_initialization();
1164         return ipv6_getaddrinfo(node, service, hints, res);
1165 }
1166
1167 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1168                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1169                       int flags)
1170 {
1171         ensure_socket_initialization();
1172         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1173 }
1174
1175 int mingw_socket(int domain, int type, int protocol)
1176 {
1177         int sockfd;
1178         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1179         if (s == INVALID_SOCKET) {
1180                 /*
1181                  * WSAGetLastError() values are regular BSD error codes
1182                  * biased by WSABASEERR.
1183                  * However, strerror() does not know about networking
1184                  * specific errors, which are values beginning at 38 or so.
1185                  * Therefore, we choose to leave the biased error code
1186                  * in errno so that _if_ someone looks up the code somewhere,
1187                  * then it is at least the number that are usually listed.
1188                  */
1189                 errno = WSAGetLastError();
1190                 return -1;
1191         }
1192         /* convert into a file descriptor */
1193         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1194                 closesocket(s);
1195                 return error("unable to make a socket file descriptor: %s",
1196                         strerror(errno));
1197         }
1198         return sockfd;
1199 }
1200
1201 #undef connect
1202 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1203 {
1204         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1205         return connect(s, sa, sz);
1206 }
1207
1208 #undef rename
1209 int mingw_rename(const char *pold, const char *pnew)
1210 {
1211         DWORD attrs, gle;
1212         int tries = 0;
1213         static const int delay[] = { 0, 1, 10, 20, 40 };
1214
1215         /*
1216          * Try native rename() first to get errno right.
1217          * It is based on MoveFile(), which cannot overwrite existing files.
1218          */
1219         if (!rename(pold, pnew))
1220                 return 0;
1221         if (errno != EEXIST)
1222                 return -1;
1223 repeat:
1224         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1225                 return 0;
1226         /* TODO: translate more errors */
1227         gle = GetLastError();
1228         if (gle == ERROR_ACCESS_DENIED &&
1229             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1230                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1231                         errno = EISDIR;
1232                         return -1;
1233                 }
1234                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1235                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1236                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1237                                 return 0;
1238                         gle = GetLastError();
1239                         /* revert file attributes on failure */
1240                         SetFileAttributes(pnew, attrs);
1241                 }
1242         }
1243         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1244                 /*
1245                  * We assume that some other process had the source or
1246                  * destination file open at the wrong moment and retry.
1247                  * In order to give the other process a higher chance to
1248                  * complete its operation, we give up our time slice now.
1249                  * If we have to retry again, we do sleep a bit.
1250                  */
1251                 Sleep(delay[tries]);
1252                 tries++;
1253                 goto repeat;
1254         }
1255         errno = EACCES;
1256         return -1;
1257 }
1258
1259 /*
1260  * Note that this doesn't return the actual pagesize, but
1261  * the allocation granularity. If future Windows specific git code
1262  * needs the real getpagesize function, we need to find another solution.
1263  */
1264 int mingw_getpagesize(void)
1265 {
1266         SYSTEM_INFO si;
1267         GetSystemInfo(&si);
1268         return si.dwAllocationGranularity;
1269 }
1270
1271 struct passwd *getpwuid(int uid)
1272 {
1273         static char user_name[100];
1274         static struct passwd p;
1275
1276         DWORD len = sizeof(user_name);
1277         if (!GetUserName(user_name, &len))
1278                 return NULL;
1279         p.pw_name = user_name;
1280         p.pw_gecos = "unknown";
1281         p.pw_dir = NULL;
1282         return &p;
1283 }
1284
1285 static HANDLE timer_event;
1286 static HANDLE timer_thread;
1287 static int timer_interval;
1288 static int one_shot;
1289 static sig_handler_t timer_fn = SIG_DFL;
1290
1291 /* The timer works like this:
1292  * The thread, ticktack(), is a trivial routine that most of the time
1293  * only waits to receive the signal to terminate. The main thread tells
1294  * the thread to terminate by setting the timer_event to the signalled
1295  * state.
1296  * But ticktack() interrupts the wait state after the timer's interval
1297  * length to call the signal handler.
1298  */
1299
1300 static unsigned __stdcall ticktack(void *dummy)
1301 {
1302         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1303                 if (timer_fn == SIG_DFL)
1304                         die("Alarm");
1305                 if (timer_fn != SIG_IGN)
1306                         timer_fn(SIGALRM);
1307                 if (one_shot)
1308                         break;
1309         }
1310         return 0;
1311 }
1312
1313 static int start_timer_thread(void)
1314 {
1315         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1316         if (timer_event) {
1317                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1318                 if (!timer_thread )
1319                         return errno = ENOMEM,
1320                                 error("cannot start timer thread");
1321         } else
1322                 return errno = ENOMEM,
1323                         error("cannot allocate resources for timer");
1324         return 0;
1325 }
1326
1327 static void stop_timer_thread(void)
1328 {
1329         if (timer_event)
1330                 SetEvent(timer_event);  /* tell thread to terminate */
1331         if (timer_thread) {
1332                 int rc = WaitForSingleObject(timer_thread, 1000);
1333                 if (rc == WAIT_TIMEOUT)
1334                         error("timer thread did not terminate timely");
1335                 else if (rc != WAIT_OBJECT_0)
1336                         error("waiting for timer thread failed: %lu",
1337                               GetLastError());
1338                 CloseHandle(timer_thread);
1339         }
1340         if (timer_event)
1341                 CloseHandle(timer_event);
1342         timer_event = NULL;
1343         timer_thread = NULL;
1344 }
1345
1346 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1347 {
1348         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1349 }
1350
1351 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1352 {
1353         static const struct timeval zero;
1354         static int atexit_done;
1355
1356         if (out != NULL)
1357                 return errno = EINVAL,
1358                         error("setitimer param 3 != NULL not implemented");
1359         if (!is_timeval_eq(&in->it_interval, &zero) &&
1360             !is_timeval_eq(&in->it_interval, &in->it_value))
1361                 return errno = EINVAL,
1362                         error("setitimer: it_interval must be zero or eq it_value");
1363
1364         if (timer_thread)
1365                 stop_timer_thread();
1366
1367         if (is_timeval_eq(&in->it_value, &zero) &&
1368             is_timeval_eq(&in->it_interval, &zero))
1369                 return 0;
1370
1371         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1372         one_shot = is_timeval_eq(&in->it_interval, &zero);
1373         if (!atexit_done) {
1374                 atexit(stop_timer_thread);
1375                 atexit_done = 1;
1376         }
1377         return start_timer_thread();
1378 }
1379
1380 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1381 {
1382         if (sig != SIGALRM)
1383                 return errno = EINVAL,
1384                         error("sigaction only implemented for SIGALRM");
1385         if (out != NULL)
1386                 return errno = EINVAL,
1387                         error("sigaction: param 3 != NULL not implemented");
1388
1389         timer_fn = in->sa_handler;
1390         return 0;
1391 }
1392
1393 #undef signal
1394 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1395 {
1396         sig_handler_t old = timer_fn;
1397         if (sig != SIGALRM)
1398                 return signal(sig, handler);
1399         timer_fn = handler;
1400         return old;
1401 }
1402
1403 static const char *make_backslash_path(const char *path)
1404 {
1405         static char buf[PATH_MAX + 1];
1406         char *c;
1407
1408         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1409                 die("Too long path: %.*s", 60, path);
1410
1411         for (c = buf; *c; c++) {
1412                 if (*c == '/')
1413                         *c = '\\';
1414         }
1415         return buf;
1416 }
1417
1418 void mingw_open_html(const char *unixpath)
1419 {
1420         const char *htmlpath = make_backslash_path(unixpath);
1421         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1422                         const char *, const char *, const char *, INT);
1423         T ShellExecute;
1424         HMODULE shell32;
1425         int r;
1426
1427         shell32 = LoadLibrary("shell32.dll");
1428         if (!shell32)
1429                 die("cannot load shell32.dll");
1430         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1431         if (!ShellExecute)
1432                 die("cannot run browser");
1433
1434         printf("Launching default browser to display HTML ...\n");
1435         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1436         FreeLibrary(shell32);
1437         /* see the MSDN documentation referring to the result codes here */
1438         if (r <= 32) {
1439                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1440         }
1441 }
1442
1443 int link(const char *oldpath, const char *newpath)
1444 {
1445         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1446         static T create_hard_link = NULL;
1447         if (!create_hard_link) {
1448                 create_hard_link = (T) GetProcAddress(
1449                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1450                 if (!create_hard_link)
1451                         create_hard_link = (T)-1;
1452         }
1453         if (create_hard_link == (T)-1) {
1454                 errno = ENOSYS;
1455                 return -1;
1456         }
1457         if (!create_hard_link(newpath, oldpath, NULL)) {
1458                 errno = err_win_to_posix(GetLastError());
1459                 return -1;
1460         }
1461         return 0;
1462 }
1463
1464 char *getpass(const char *prompt)
1465 {
1466         struct strbuf buf = STRBUF_INIT;
1467
1468         fputs(prompt, stderr);
1469         for (;;) {
1470                 char c = _getch();
1471                 if (c == '\r' || c == '\n')
1472                         break;
1473                 strbuf_addch(&buf, c);
1474         }
1475         fputs("\n", stderr);
1476         return strbuf_detach(&buf, NULL);
1477 }
1478
1479 #ifndef NO_MINGW_REPLACE_READDIR
1480 /* MinGW readdir implementation to avoid extra lstats for Git */
1481 struct mingw_DIR
1482 {
1483         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1484         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1485         long                    dd_handle;      /* _findnext handle */
1486         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1487         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1488 };
1489
1490 struct dirent *mingw_readdir(DIR *dir)
1491 {
1492         WIN32_FIND_DATAA buf;
1493         HANDLE handle;
1494         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1495
1496         if (!dir->dd_handle) {
1497                 errno = EBADF; /* No set_errno for mingw */
1498                 return NULL;
1499         }
1500
1501         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1502         {
1503                 DWORD lasterr;
1504                 handle = FindFirstFileA(dir->dd_name, &buf);
1505                 lasterr = GetLastError();
1506                 dir->dd_handle = (long)handle;
1507                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1508                         errno = err_win_to_posix(lasterr);
1509                         return NULL;
1510                 }
1511         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1512                 return NULL;
1513         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1514                 DWORD lasterr = GetLastError();
1515                 FindClose((HANDLE)dir->dd_handle);
1516                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1517                 /* POSIX says you shouldn't set errno when readdir can't
1518                    find any more files; so, if another error we leave it set. */
1519                 if (lasterr != ERROR_NO_MORE_FILES)
1520                         errno = err_win_to_posix(lasterr);
1521                 return NULL;
1522         }
1523
1524         /* We get here if `buf' contains valid data.  */
1525         strcpy(dir->dd_dir.d_name, buf.cFileName);
1526         ++dir->dd_stat;
1527
1528         /* Set file type, based on WIN32_FIND_DATA */
1529         mdir->dd_dir.d_type = 0;
1530         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1531                 mdir->dd_dir.d_type |= DT_DIR;
1532         else
1533                 mdir->dd_dir.d_type |= DT_REG;
1534
1535         return (struct dirent*)&dir->dd_dir;
1536 }
1537 #endif // !NO_MINGW_REPLACE_READDIR