compat/mingw.c

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