compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <wchar.h>
   5 #include "../strbuf.h"
   6 #include "../run-command.h"
   7 #include "../cache.h"
   8
   9 static const int delay[] = { 0, 1, 10, 20, 40 };
  10 unsigned int _CRT_fmode = _O_BINARY;
  11
  12 int err_win_to_posix(DWORD winerr)
  13 {
  14         int error = ENOSYS;
  15         switch(winerr) {
  16         case ERROR_ACCESS_DENIED: error = EACCES; break;
  17         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  18         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  19         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  20         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  21         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  22         case ERROR_BAD_COMMAND: error = EIO; break;
  23         case ERROR_BAD_DEVICE: error = ENODEV; break;
  24         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  25         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  27         case ERROR_BAD_LENGTH: error = EINVAL; break;
  28         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  29         case ERROR_BAD_PIPE: error = EPIPE; break;
  30         case ERROR_BAD_UNIT: error = ENODEV; break;
  31         case ERROR_BAD_USERNAME: error = EINVAL; break;
  32         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  33         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  34         case ERROR_BUSY: error = EBUSY; break;
  35         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  36         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  37         case ERROR_CANNOT_MAKE: error = EACCES; break;
  38         case ERROR_CANTOPEN: error = EIO; break;
  39         case ERROR_CANTREAD: error = EIO; break;
  40         case ERROR_CANTWRITE: error = EIO; break;
  41         case ERROR_CRC: error = EIO; break;
  42         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  43         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  44         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  45         case ERROR_DIRECTORY: error = EINVAL; break;
  46         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  47         case ERROR_DISK_CHANGE: error = EIO; break;
  48         case ERROR_DISK_FULL: error = ENOSPC; break;
  49         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  50         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  51         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  52         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  53         case ERROR_FILE_EXISTS: error = EEXIST; break;
  54         case ERROR_FILE_INVALID: error = ENODEV; break;
  55         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  56         case ERROR_GEN_FAILURE: error = EIO; break;
  57         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  58         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  59         case ERROR_INVALID_ACCESS: error = EACCES; break;
  60         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  61         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  62         case ERROR_INVALID_DATA: error = EINVAL; break;
  63         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  64         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  65         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  66         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  67         case ERROR_INVALID_HANDLE: error = EBADF; break;
  68         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  69         case ERROR_INVALID_NAME: error = EINVAL; break;
  70         case ERROR_INVALID_OWNER: error = EINVAL; break;
  71         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  72         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  73         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  74         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  75         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  76         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  77         case ERROR_IO_DEVICE: error = EIO; break;
  78         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  79         case ERROR_LOCKED: error = EBUSY; break;
  80         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  81         case ERROR_LOGON_FAILURE: error = EACCES; break;
  82         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  83         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  84         case ERROR_MORE_DATA: error = EPIPE; break;
  85         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  86         case ERROR_NOACCESS: error = EFAULT; break;
  87         case ERROR_NONE_MAPPED: error = EINVAL; break;
  88         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  89         case ERROR_NOT_READY: error = EAGAIN; break;
  90         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  91         case ERROR_NO_DATA: error = EPIPE; break;
  92         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  93         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  94         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  95         case ERROR_OPEN_FAILED: error = EIO; break;
  96         case ERROR_OPEN_FILES: error = EBUSY; break;
  97         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  98         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  99         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 100         case ERROR_PATH_BUSY: error = EBUSY; break;
 101         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 102         case ERROR_PIPE_BUSY: error = EBUSY; break;
 103         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 104         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 105         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 106         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 107         case ERROR_READ_FAULT: error = EIO; break;
 108         case ERROR_SEEK: error = EIO; break;
 109         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 110         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 111         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 112         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 113         case ERROR_SWAPERROR: error = ENOENT; break;
 114         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 115         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 116         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 117         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 118         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 119         case ERROR_WRITE_FAULT: error = EIO; break;
 120         case ERROR_WRITE_PROTECT: error = EROFS; break;
 121         }
 122         return error;
 123 }
 124
 125 static inline int is_file_in_use_error(DWORD errcode)
 126 {
 127         switch (errcode) {
 128         case ERROR_SHARING_VIOLATION:
 129         case ERROR_ACCESS_DENIED:
 130                 return 1;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static int read_yes_no_answer(void)
 137 {
 138         char answer[1024];
 139
 140         if (fgets(answer, sizeof(answer), stdin)) {
 141                 size_t answer_len = strlen(answer);
 142                 int got_full_line = 0, c;
 143
 144                 /* remove the newline */
 145                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 146                         answer[answer_len-2] = '\0';
 147                         got_full_line = 1;
 148                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 149                         answer[answer_len-1] = '\0';
 150                         got_full_line = 1;
 151                 }
 152                 /* flush the buffer in case we did not get the full line */
 153                 if (!got_full_line)
 154                         while ((c = getchar()) != EOF && c != '\n')
 155                                 ;
 156         } else
 157                 /* we could not read, return the
 158                  * default answer which is no */
 159                 return 0;
 160
 161         if (tolower(answer[0]) == 'y' && !answer[1])
 162                 return 1;
 163         if (!strncasecmp(answer, "yes", sizeof(answer)))
 164                 return 1;
 165         if (tolower(answer[0]) == 'n' && !answer[1])
 166                 return 0;
 167         if (!strncasecmp(answer, "no", sizeof(answer)))
 168                 return 0;
 169
 170         /* did not find an answer we understand */
 171         return -1;
 172 }
 173
 174 static int ask_yes_no_if_possible(const char *format, ...)
 175 {
 176         char question[4096];
 177         const char *retry_hook[] = { NULL, NULL, NULL };
 178         va_list args;
 179
 180         va_start(args, format);
 181         vsnprintf(question, sizeof(question), format, args);
 182         va_end(args);
 183
 184         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 185                 retry_hook[1] = question;
 186                 return !run_command_v_opt(retry_hook, 0);
 187         }
 188
 189         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 190                 return 0;
 191
 192         while (1) {
 193                 int answer;
 194                 fprintf(stderr, "%s (y/n) ", question);
 195
 196                 if ((answer = read_yes_no_answer()) >= 0)
 197                         return answer;
 198
 199                 fprintf(stderr, "Sorry, I did not understand your answer. "
 200                                 "Please type 'y' or 'n'\n");
 201         }
 202 }
 203
 204 int mingw_unlink(const char *pathname)
 205 {
 206         int ret, tries = 0;
 207         wchar_t wpathname[MAX_PATH];
 208         if (xutftowcs_path(wpathname, pathname) < 0)
 209                 return -1;
 210
 211         /* read-only files cannot be removed */
 212         _wchmod(wpathname, 0666);
 213         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 214                 if (!is_file_in_use_error(GetLastError()))
 215                         break;
 216                 /*
 217                  * We assume that some other process had the source or
 218                  * destination file open at the wrong moment and retry.
 219                  * In order to give the other process a higher chance to
 220                  * complete its operation, we give up our time slice now.
 221                  * If we have to retry again, we do sleep a bit.
 222                  */
 223                 Sleep(delay[tries]);
 224                 tries++;
 225         }
 226         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 227                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 228                         "Should I try again?", pathname))
 229                ret = _wunlink(wpathname);
 230         return ret;
 231 }
 232
 233 static int is_dir_empty(const wchar_t *wpath)
 234 {
 235         WIN32_FIND_DATAW findbuf;
 236         HANDLE handle;
 237         wchar_t wbuf[MAX_PATH + 2];
 238         wcscpy(wbuf, wpath);
 239         wcscat(wbuf, L"\\*");
 240         handle = FindFirstFileW(wbuf, &findbuf);
 241         if (handle == INVALID_HANDLE_VALUE)
 242                 return GetLastError() == ERROR_NO_MORE_FILES;
 243
 244         while (!wcscmp(findbuf.cFileName, L".") ||
 245                         !wcscmp(findbuf.cFileName, L".."))
 246                 if (!FindNextFileW(handle, &findbuf)) {
 247                         DWORD err = GetLastError();
 248                         FindClose(handle);
 249                         return err == ERROR_NO_MORE_FILES;
 250                 }
 251         FindClose(handle);
 252         return 0;
 253 }
 254
 255 int mingw_rmdir(const char *pathname)
 256 {
 257         int ret, tries = 0;
 258         wchar_t wpathname[MAX_PATH];
 259         if (xutftowcs_path(wpathname, pathname) < 0)
 260                 return -1;
 261
 262         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 263                 if (!is_file_in_use_error(GetLastError()))
 264                         errno = err_win_to_posix(GetLastError());
 265                 if (errno != EACCES)
 266                         break;
 267                 if (!is_dir_empty(wpathname)) {
 268                         errno = ENOTEMPTY;
 269                         break;
 270                 }
 271                 /*
 272                  * We assume that some other process had the source or
 273                  * destination file open at the wrong moment and retry.
 274                  * In order to give the other process a higher chance to
 275                  * complete its operation, we give up our time slice now.
 276                  * If we have to retry again, we do sleep a bit.
 277                  */
 278                 Sleep(delay[tries]);
 279                 tries++;
 280         }
 281         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 282                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 283                         "Should I try again?", pathname))
 284                ret = _wrmdir(wpathname);
 285         return ret;
 286 }
 287
 288 static int make_hidden(const wchar_t *path)
 289 {
 290         DWORD attribs = GetFileAttributesW(path);
 291         if (SetFileAttributesW(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 292                 return 0;
 293         errno = err_win_to_posix(GetLastError());
 294         return -1;
 295 }
 296
 297 void mingw_mark_as_git_dir(const char *dir)
 298 {
 299         wchar_t wdir[MAX_PATH];
 300         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository())
 301                 if (xutftowcs_path(wdir, dir) < 0 || make_hidden(wdir))
 302                         warning("Failed to make '%s' hidden", dir);
 303         git_config_set("core.hideDotFiles",
 304                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 305                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 306                  "dotGitOnly" : "true"));
 307 }
 308
 309 int mingw_mkdir(const char *path, int mode)
 310 {
 311         int ret;
 312         wchar_t wpath[MAX_PATH];
 313         if (xutftowcs_path(wpath, path) < 0)
 314                 return -1;
 315         ret = _wmkdir(wpath);
 316         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 317                 /*
 318                  * In Windows a file or dir starting with a dot is not
 319                  * automatically hidden. So lets mark it as hidden when
 320                  * such a directory is created.
 321                  */
 322                 const char *start = basename((char*)path);
 323                 if (*start == '.')
 324                         return make_hidden(wpath);
 325         }
 326         return ret;
 327 }
 328
 329 int mingw_open (const char *filename, int oflags, ...)
 330 {
 331         va_list args;
 332         unsigned mode;
 333         int fd;
 334         wchar_t wfilename[MAX_PATH];
 335
 336         va_start(args, oflags);
 337         mode = va_arg(args, int);
 338         va_end(args);
 339
 340         if (filename && !strcmp(filename, "/dev/null"))
 341                 filename = "nul";
 342
 343         if (xutftowcs_path(wfilename, filename) < 0)
 344                 return -1;
 345         fd = _wopen(wfilename, oflags, mode);
 346
 347         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 348                 DWORD attrs = GetFileAttributesW(wfilename);
 349                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 350                         errno = EISDIR;
 351         }
 352         if ((oflags & O_CREAT) && fd >= 0 &&
 353             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 354                 /*
 355                  * In Windows a file or dir starting with a dot is not
 356                  * automatically hidden. So lets mark it as hidden when
 357                  * such a file is created.
 358                  */
 359                 const char *start = basename((char*)filename);
 360                 if (*start == '.' && make_hidden(wfilename))
 361                         warning("Could not mark '%s' as hidden.", filename);
 362         }
 363         return fd;
 364 }
 365
 366 static BOOL WINAPI ctrl_ignore(DWORD type)
 367 {
 368         return TRUE;
 369 }
 370
 371 #undef fgetc
 372 int mingw_fgetc(FILE *stream)
 373 {
 374         int ch;
 375         if (!isatty(_fileno(stream)))
 376                 return fgetc(stream);
 377
 378         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 379         while (1) {
 380                 ch = fgetc(stream);
 381                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 382                         break;
 383
 384                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 385                 mingw_raise(SIGINT);
 386         }
 387         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 388         return ch;
 389 }
 390
 391 #undef fopen
 392 FILE *mingw_fopen (const char *filename, const char *otype)
 393 {
 394         int hide = 0;
 395         FILE *file;
 396         wchar_t wfilename[MAX_PATH], wotype[4];
 397         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 398             basename((char*)filename)[0] == '.')
 399                 hide = access(filename, F_OK);
 400         if (filename && !strcmp(filename, "/dev/null"))
 401                 filename = "nul";
 402         if (xutftowcs_path(wfilename, filename) < 0 ||
 403                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 404                 return NULL;
 405         file = _wfopen(wfilename, wotype);
 406         if (file && hide && make_hidden(wfilename))
 407                 warning("Could not mark '%s' as hidden.", filename);
 408         return file;
 409 }
 410
 411 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 412 {
 413         int hide = 0;
 414         FILE *file;
 415         wchar_t wfilename[MAX_PATH], wotype[4];
 416         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 417             basename((char*)filename)[0] == '.')
 418                 hide = access(filename, F_OK);
 419         if (filename && !strcmp(filename, "/dev/null"))
 420                 filename = "nul";
 421         if (xutftowcs_path(wfilename, filename) < 0 ||
 422                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 423                 return NULL;
 424         file = _wfreopen(wfilename, wotype, stream);
 425         if (file && hide && make_hidden(wfilename))
 426                 warning("Could not mark '%s' as hidden.", filename);
 427         return file;
 428 }
 429
 430 #undef fflush
 431 int mingw_fflush(FILE *stream)
 432 {
 433         int ret = fflush(stream);
 434
 435         /*
 436          * write() is used behind the scenes of stdio output functions.
 437          * Since git code does not check for errors after each stdio write
 438          * operation, it can happen that write() is called by a later
 439          * stdio function even if an earlier write() call failed. In the
 440          * case of a pipe whose readable end was closed, only the first
 441          * call to write() reports EPIPE on Windows. Subsequent write()
 442          * calls report EINVAL. It is impossible to notice whether this
 443          * fflush invocation triggered such a case, therefore, we have to
 444          * catch all EINVAL errors whole-sale.
 445          */
 446         if (ret && errno == EINVAL)
 447                 errno = EPIPE;
 448
 449         return ret;
 450 }
 451
 452 int mingw_access(const char *filename, int mode)
 453 {
 454         wchar_t wfilename[MAX_PATH];
 455         if (xutftowcs_path(wfilename, filename) < 0)
 456                 return -1;
 457         /* X_OK is not supported by the MSVCRT version */
 458         return _waccess(wfilename, mode & ~X_OK);
 459 }
 460
 461 int mingw_chdir(const char *dirname)
 462 {
 463         wchar_t wdirname[MAX_PATH];
 464         if (xutftowcs_path(wdirname, dirname) < 0)
 465                 return -1;
 466         return _wchdir(wdirname);
 467 }
 468
 469 int mingw_chmod(const char *filename, int mode)
 470 {
 471         wchar_t wfilename[MAX_PATH];
 472         if (xutftowcs_path(wfilename, filename) < 0)
 473                 return -1;
 474         return _wchmod(wfilename, mode);
 475 }
 476
 477 /* We keep the do_lstat code in a separate function to avoid recursion.
 478  * When a path ends with a slash, the stat will fail with ENOENT. In
 479  * this case, we strip the trailing slashes and stat again.
 480  *
 481  * If follow is true then act like stat() and report on the link
 482  * target. Otherwise report on the link itself.
 483  */
 484 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 485 {
 486         WIN32_FILE_ATTRIBUTE_DATA fdata;
 487         wchar_t wfilename[MAX_PATH];
 488         if (xutftowcs_path(wfilename, file_name) < 0)
 489                 return -1;
 490
 491         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 492                 buf->st_ino = 0;
 493                 buf->st_gid = 0;
 494                 buf->st_uid = 0;
 495                 buf->st_nlink = 1;
 496                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 497                 buf->st_size = fdata.nFileSizeLow |
 498                         (((off_t)fdata.nFileSizeHigh)<<32);
 499                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 500                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 501                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 502                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 503                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 504                         WIN32_FIND_DATAW findbuf;
 505                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 506                         if (handle != INVALID_HANDLE_VALUE) {
 507                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 508                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 509                                         if (follow) {
 510                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 511                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 512                                         } else {
 513                                                 buf->st_mode = S_IFLNK;
 514                                         }
 515                                         buf->st_mode |= S_IREAD;
 516                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 517                                                 buf->st_mode |= S_IWRITE;
 518                                 }
 519                                 FindClose(handle);
 520                         }
 521                 }
 522                 return 0;
 523         }
 524         switch (GetLastError()) {
 525         case ERROR_ACCESS_DENIED:
 526         case ERROR_SHARING_VIOLATION:
 527         case ERROR_LOCK_VIOLATION:
 528         case ERROR_SHARING_BUFFER_EXCEEDED:
 529                 errno = EACCES;
 530                 break;
 531         case ERROR_BUFFER_OVERFLOW:
 532                 errno = ENAMETOOLONG;
 533                 break;
 534         case ERROR_NOT_ENOUGH_MEMORY:
 535                 errno = ENOMEM;
 536                 break;
 537         default:
 538                 errno = ENOENT;
 539                 break;
 540         }
 541         return -1;
 542 }
 543
 544 /* We provide our own lstat/fstat functions, since the provided
 545  * lstat/fstat functions are so slow. These stat functions are
 546  * tailored for Git's usage (read: fast), and are not meant to be
 547  * complete. Note that Git stat()s are redirected to mingw_lstat()
 548  * too, since Windows doesn't really handle symlinks that well.
 549  */
 550 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 551 {
 552         int namelen;
 553         char alt_name[PATH_MAX];
 554
 555         if (!do_lstat(follow, file_name, buf))
 556                 return 0;
 557
 558         /* if file_name ended in a '/', Windows returned ENOENT;
 559          * try again without trailing slashes
 560          */
 561         if (errno != ENOENT)
 562                 return -1;
 563
 564         namelen = strlen(file_name);
 565         if (namelen && file_name[namelen-1] != '/')
 566                 return -1;
 567         while (namelen && file_name[namelen-1] == '/')
 568                 --namelen;
 569         if (!namelen || namelen >= PATH_MAX)
 570                 return -1;
 571
 572         memcpy(alt_name, file_name, namelen);
 573         alt_name[namelen] = 0;
 574         return do_lstat(follow, alt_name, buf);
 575 }
 576
 577 int (*lstat)(const char *file_name, struct stat *buf) = mingw_lstat;
 578
 579 int mingw_lstat(const char *file_name, struct stat *buf)
 580 {
 581         return do_stat_internal(0, file_name, buf);
 582 }
 583 int mingw_stat(const char *file_name, struct stat *buf)
 584 {
 585         return do_stat_internal(1, file_name, buf);
 586 }
 587
 588 int mingw_fstat(int fd, struct stat *buf)
 589 {
 590         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 591         BY_HANDLE_FILE_INFORMATION fdata;
 592
 593         if (fh == INVALID_HANDLE_VALUE) {
 594                 errno = EBADF;
 595                 return -1;
 596         }
 597         /* direct non-file handles to MS's fstat() */
 598         if (GetFileType(fh) != FILE_TYPE_DISK)
 599                 return _fstati64(fd, buf);
 600
 601         if (GetFileInformationByHandle(fh, &fdata)) {
 602                 buf->st_ino = 0;
 603                 buf->st_gid = 0;
 604                 buf->st_uid = 0;
 605                 buf->st_nlink = 1;
 606                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 607                 buf->st_size = fdata.nFileSizeLow |
 608                         (((off_t)fdata.nFileSizeHigh)<<32);
 609                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 610                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 611                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 612                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 613                 return 0;
 614         }
 615         errno = EBADF;
 616         return -1;
 617 }
 618
 619 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 620 {
 621         long long winTime = t * 10000000LL + 116444736000000000LL;
 622         ft->dwLowDateTime = winTime;
 623         ft->dwHighDateTime = winTime >> 32;
 624 }
 625
 626 int mingw_utime (const char *file_name, const struct utimbuf *times)
 627 {
 628         FILETIME mft, aft;
 629         int fh, rc;
 630         DWORD attrs;
 631         wchar_t wfilename[MAX_PATH];
 632         if (xutftowcs_path(wfilename, file_name) < 0)
 633                 return -1;
 634
 635         /* must have write permission */
 636         attrs = GetFileAttributesW(wfilename);
 637         if (attrs != INVALID_FILE_ATTRIBUTES &&
 638             (attrs & FILE_ATTRIBUTE_READONLY)) {
 639                 /* ignore errors here; open() will report them */
 640                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 641         }
 642
 643         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 644                 rc = -1;
 645                 goto revert_attrs;
 646         }
 647
 648         if (times) {
 649                 time_t_to_filetime(times->modtime, &mft);
 650                 time_t_to_filetime(times->actime, &aft);
 651         } else {
 652                 GetSystemTimeAsFileTime(&mft);
 653                 aft = mft;
 654         }
 655         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 656                 errno = EINVAL;
 657                 rc = -1;
 658         } else
 659                 rc = 0;
 660         close(fh);
 661
 662 revert_attrs:
 663         if (attrs != INVALID_FILE_ATTRIBUTES &&
 664             (attrs & FILE_ATTRIBUTE_READONLY)) {
 665                 /* ignore errors again */
 666                 SetFileAttributesW(wfilename, attrs);
 667         }
 668         return rc;
 669 }
 670
 671 unsigned int sleep (unsigned int seconds)
 672 {
 673         Sleep(seconds*1000);
 674         return 0;
 675 }
 676
 677 char *mingw_mktemp(char *template)
 678 {
 679         wchar_t wtemplate[MAX_PATH];
 680         if (xutftowcs_path(wtemplate, template) < 0)
 681                 return NULL;
 682         if (!_wmktemp(wtemplate))
 683                 return NULL;
 684         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 685                 return NULL;
 686         return template;
 687 }
 688
 689 int mkstemp(char *template)
 690 {
 691         char *filename = mktemp(template);
 692         if (filename == NULL)
 693                 return -1;
 694         return open(filename, O_RDWR | O_CREAT, 0600);
 695 }
 696
 697 int gettimeofday(struct timeval *tv, void *tz)
 698 {
 699         FILETIME ft;
 700         long long hnsec;
 701
 702         GetSystemTimeAsFileTime(&ft);
 703         hnsec = filetime_to_hnsec(&ft);
 704         tv->tv_sec = hnsec / 10000000;
 705         tv->tv_usec = (hnsec % 10000000) / 10;
 706         return 0;
 707 }
 708
 709 int pipe(int filedes[2])
 710 {
 711         HANDLE h[2];
 712
 713         /* this creates non-inheritable handles */
 714         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 715                 errno = err_win_to_posix(GetLastError());
 716                 return -1;
 717         }
 718         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 719         if (filedes[0] < 0) {
 720                 CloseHandle(h[0]);
 721                 CloseHandle(h[1]);
 722                 return -1;
 723         }
 724         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 725         if (filedes[0] < 0) {
 726                 close(filedes[0]);
 727                 CloseHandle(h[1]);
 728                 return -1;
 729         }
 730         return 0;
 731 }
 732
 733 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 734 {
 735         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 736         memcpy(result, gmtime(timep), sizeof(struct tm));
 737         return result;
 738 }
 739
 740 struct tm *localtime_r(const time_t *timep, struct tm *result)
 741 {
 742         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 743         memcpy(result, localtime(timep), sizeof(struct tm));
 744         return result;
 745 }
 746
 747 char *mingw_getcwd(char *pointer, int len)
 748 {
 749         int i;
 750         wchar_t wpointer[MAX_PATH];
 751         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 752                 return NULL;
 753         if (xwcstoutf(pointer, wpointer, len) < 0)
 754                 return NULL;
 755         for (i = 0; pointer[i]; i++)
 756                 if (pointer[i] == '\\')
 757                         pointer[i] = '/';
 758         return pointer;
 759 }
 760
 761 /*
 762  * Compare environment entries by key (i.e. stopping at '=' or '\0').
 763  */
 764 static int compareenv(const void *v1, const void *v2)
 765 {
 766         const char *e1 = *(const char**)v1;
 767         const char *e2 = *(const char**)v2;
 768
 769         for (;;) {
 770                 int c1 = *e1++;
 771                 int c2 = *e2++;
 772                 c1 = (c1 == '=') ? 0 : tolower(c1);
 773                 c2 = (c2 == '=') ? 0 : tolower(c2);
 774                 if (c1 > c2)
 775                         return 1;
 776                 if (c1 < c2)
 777                         return -1;
 778                 if (c1 == 0)
 779                         return 0;
 780         }
 781 }
 782
 783 static int bsearchenv(char **env, const char *name, size_t size)
 784 {
 785         unsigned low = 0, high = size;
 786         while (low < high) {
 787                 unsigned mid = low + ((high - low) >> 1);
 788                 int cmp = compareenv(&env[mid], &name);
 789                 if (cmp < 0)
 790                         low = mid + 1;
 791                 else if (cmp > 0)
 792                         high = mid;
 793                 else
 794                         return mid;
 795         }
 796         return ~low; /* not found, return 1's complement of insert position */
 797 }
 798
 799 /*
 800  * If name contains '=', then sets the variable, otherwise it unsets it
 801  * Size includes the terminating NULL. Env must have room for size + 1 entries
 802  * (in case of insert). Returns the new size. Optionally frees removed entries.
 803  */
 804 static int do_putenv(char **env, const char *name, int size, int free_old)
 805 {
 806         int i = bsearchenv(env, name, size - 1);
 807
 808         /* optionally free removed / replaced entry */
 809         if (i >= 0 && free_old)
 810                 free(env[i]);
 811
 812         if (strchr(name, '=')) {
 813                 /* if new value ('key=value') is specified, insert or replace entry */
 814                 if (i < 0) {
 815                         i = ~i;
 816                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
 817                         size++;
 818                 }
 819                 env[i] = (char*) name;
 820         } else if (i >= 0) {
 821                 /* otherwise ('key') remove existing entry */
 822                 size--;
 823                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
 824         }
 825         return size;
 826 }
 827
 828 /* used number of elements of environ array, including terminating NULL */
 829 static int environ_size = 0;
 830 /* allocated size of environ array, in bytes */
 831 static int environ_alloc = 0;
 832
 833 char *mingw_getenv(const char *name)
 834 {
 835         char *value;
 836         int pos = bsearchenv(environ, name, environ_size - 1);
 837         if (pos < 0)
 838                 return NULL;
 839         value = strchr(environ[pos], '=');
 840         return value ? &value[1] : NULL;
 841 }
 842
 843 int mingw_putenv(const char *namevalue)
 844 {
 845         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
 846         environ_size = do_putenv(environ, namevalue, environ_size, 1);
 847         return 0;
 848 }
 849
 850 /*
 851  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 852  * (Parsing C++ Command-Line Arguments)
 853  */
 854 static const char *quote_arg(const char *arg)
 855 {
 856         /* count chars to quote */
 857         int len = 0, n = 0;
 858         int force_quotes = 0;
 859         char *q, *d;
 860         const char *p = arg;
 861         if (!*p) force_quotes = 1;
 862         while (*p) {
 863                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 864                         force_quotes = 1;
 865                 else if (*p == '"')
 866                         n++;
 867                 else if (*p == '\\') {
 868                         int count = 0;
 869                         while (*p == '\\') {
 870                                 count++;
 871                                 p++;
 872                                 len++;
 873                         }
 874                         if (*p == '"')
 875                                 n += count*2 + 1;
 876                         continue;
 877                 }
 878                 len++;
 879                 p++;
 880         }
 881         if (!force_quotes && n == 0)
 882                 return arg;
 883
 884         /* insert \ where necessary */
 885         d = q = xmalloc(len+n+3);
 886         *d++ = '"';
 887         while (*arg) {
 888                 if (*arg == '"')
 889                         *d++ = '\\';
 890                 else if (*arg == '\\') {
 891                         int count = 0;
 892                         while (*arg == '\\') {
 893                                 count++;
 894                                 *d++ = *arg++;
 895                         }
 896                         if (*arg == '"') {
 897                                 while (count-- > 0)
 898                                         *d++ = '\\';
 899                                 *d++ = '\\';
 900                         }
 901                 }
 902                 *d++ = *arg++;
 903         }
 904         *d++ = '"';
 905         *d++ = 0;
 906         return q;
 907 }
 908
 909 static const char *parse_interpreter(const char *cmd)
 910 {
 911         static char buf[100];
 912         char *p, *opt;
 913         int n, fd;
 914
 915         /* don't even try a .exe */
 916         n = strlen(cmd);
 917         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 918                 return NULL;
 919
 920         fd = open(cmd, O_RDONLY);
 921         if (fd < 0)
 922                 return NULL;
 923         n = read(fd, buf, sizeof(buf)-1);
 924         close(fd);
 925         if (n < 4)      /* at least '#!/x' and not error */
 926                 return NULL;
 927
 928         if (buf[0] != '#' || buf[1] != '!')
 929                 return NULL;
 930         buf[n] = '\0';
 931         p = buf + strcspn(buf, "\r\n");
 932         if (!*p)
 933                 return NULL;
 934
 935         *p = '\0';
 936         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 937                 return NULL;
 938         /* strip options */
 939         if ((opt = strchr(p+1, ' ')))
 940                 *opt = '\0';
 941         return p+1;
 942 }
 943
 944 /*
 945  * Splits the PATH into parts.
 946  */
 947 static char **get_path_split(void)
 948 {
 949         char *p, **path, *envpath = getenv("PATH");
 950         int i, n = 0;
 951
 952         if (!envpath || !*envpath)
 953                 return NULL;
 954
 955         envpath = xstrdup(envpath);
 956         p = envpath;
 957         while (p) {
 958                 char *dir = p;
 959                 p = strchr(p, ';');
 960                 if (p) *p++ = '\0';
 961                 if (*dir) {     /* not earlier, catches series of ; */
 962                         ++n;
 963                 }
 964         }
 965         if (!n)
 966                 return NULL;
 967
 968         path = xmalloc((n+1)*sizeof(char *));
 969         p = envpath;
 970         i = 0;
 971         do {
 972                 if (*p)
 973                         path[i++] = xstrdup(p);
 974                 p = p+strlen(p)+1;
 975         } while (i < n);
 976         path[i] = NULL;
 977
 978         free(envpath);
 979
 980         return path;
 981 }
 982
 983 static void free_path_split(char **path)
 984 {
 985         char **p = path;
 986
 987         if (!path)
 988                 return;
 989
 990         while (*p)
 991                 free(*p++);
 992         free(path);
 993 }
 994
 995 /*
 996  * exe_only means that we only want to detect .exe files, but not scripts
 997  * (which do not have an extension)
 998  */
 999 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
1000 {
1001         char path[MAX_PATH];
1002         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
1003
1004         if (!isexe && access(path, F_OK) == 0)
1005                 return xstrdup(path);
1006         path[strlen(path)-4] = '\0';
1007         if ((!exe_only || isexe) && access(path, F_OK) == 0)
1008                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1009                         return xstrdup(path);
1010         return NULL;
1011 }
1012
1013 /*
1014  * Determines the absolute path of cmd using the split path in path.
1015  * If cmd contains a slash or backslash, no lookup is performed.
1016  */
1017 static char *path_lookup(const char *cmd, char **path, int exe_only)
1018 {
1019         char *prog = NULL;
1020         int len = strlen(cmd);
1021         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1022
1023         if (strchr(cmd, '/') || strchr(cmd, '\\'))
1024                 prog = xstrdup(cmd);
1025
1026         while (!prog && *path)
1027                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
1028
1029         return prog;
1030 }
1031
1032 /*
1033  * Create environment block suitable for CreateProcess. Merges current
1034  * process environment and the supplied environment changes.
1035  */
1036 static wchar_t *make_environment_block(char **deltaenv)
1037 {
1038         wchar_t *wenvblk = NULL;
1039         char **tmpenv;
1040         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1041
1042         while (deltaenv && deltaenv[i])
1043                 i++;
1044
1045         /* copy the environment, leaving space for changes */
1046         tmpenv = xmalloc((size + i) * sizeof(char*));
1047         memcpy(tmpenv, environ, size * sizeof(char*));
1048
1049         /* merge supplied environment changes into the temporary environment */
1050         for (i = 0; deltaenv && deltaenv[i]; i++)
1051                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1052
1053         /* create environment block from temporary environment */
1054         for (i = 0; tmpenv[i]; i++) {
1055                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1056                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1057                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1058         }
1059         /* add final \0 terminator */
1060         wenvblk[wenvpos] = 0;
1061         free(tmpenv);
1062         return wenvblk;
1063 }
1064
1065 struct pinfo_t {
1066         struct pinfo_t *next;
1067         pid_t pid;
1068         HANDLE proc;
1069 };
1070 static struct pinfo_t *pinfo = NULL;
1071 CRITICAL_SECTION pinfo_cs;
1072
1073 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1074                               const char *dir,
1075                               int prepend_cmd, int fhin, int fhout, int fherr)
1076 {
1077         STARTUPINFOW si;
1078         PROCESS_INFORMATION pi;
1079         struct strbuf args;
1080         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1081         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1082         BOOL ret;
1083
1084         /* Determine whether or not we are associated to a console */
1085         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1086                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1087                         FILE_ATTRIBUTE_NORMAL, NULL);
1088         if (cons == INVALID_HANDLE_VALUE) {
1089                 /* There is no console associated with this process.
1090                  * Since the child is a console process, Windows
1091                  * would normally create a console window. But
1092                  * since we'll be redirecting std streams, we do
1093                  * not need the console.
1094                  * It is necessary to use DETACHED_PROCESS
1095                  * instead of CREATE_NO_WINDOW to make ssh
1096                  * recognize that it has no console.
1097                  */
1098                 flags |= DETACHED_PROCESS;
1099         } else {
1100                 /* There is already a console. If we specified
1101                  * DETACHED_PROCESS here, too, Windows would
1102                  * disassociate the child from the console.
1103                  * The same is true for CREATE_NO_WINDOW.
1104                  * Go figure!
1105                  */
1106                 CloseHandle(cons);
1107         }
1108         memset(&si, 0, sizeof(si));
1109         si.cb = sizeof(si);
1110         si.dwFlags = STARTF_USESTDHANDLES;
1111         si.hStdInput = winansi_get_osfhandle(fhin);
1112         si.hStdOutput = winansi_get_osfhandle(fhout);
1113         si.hStdError = winansi_get_osfhandle(fherr);
1114
1115         if (xutftowcs_path(wcmd, cmd) < 0)
1116                 return -1;
1117         if (dir && xutftowcs_path(wdir, dir) < 0)
1118                 return -1;
1119
1120         /* concatenate argv, quoting args as we go */
1121         strbuf_init(&args, 0);
1122         if (prepend_cmd) {
1123                 char *quoted = (char *)quote_arg(cmd);
1124                 strbuf_addstr(&args, quoted);
1125                 if (quoted != cmd)
1126                         free(quoted);
1127         }
1128         for (; *argv; argv++) {
1129                 char *quoted = (char *)quote_arg(*argv);
1130                 if (*args.buf)
1131                         strbuf_addch(&args, ' ');
1132                 strbuf_addstr(&args, quoted);
1133                 if (quoted != *argv)
1134                         free(quoted);
1135         }
1136
1137         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1138         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1139         strbuf_release(&args);
1140
1141         wenvblk = make_environment_block(deltaenv);
1142
1143         memset(&pi, 0, sizeof(pi));
1144         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1145                 wenvblk, dir ? wdir : NULL, &si, &pi);
1146
1147         free(wenvblk);
1148         free(wargs);
1149
1150         if (!ret) {
1151                 errno = ENOENT;
1152                 return -1;
1153         }
1154         CloseHandle(pi.hThread);
1155
1156         /*
1157          * The process ID is the human-readable identifier of the process
1158          * that we want to present in log and error messages. The handle
1159          * is not useful for this purpose. But we cannot close it, either,
1160          * because it is not possible to turn a process ID into a process
1161          * handle after the process terminated.
1162          * Keep the handle in a list for waitpid.
1163          */
1164         EnterCriticalSection(&pinfo_cs);
1165         {
1166                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1167                 info->pid = pi.dwProcessId;
1168                 info->proc = pi.hProcess;
1169                 info->next = pinfo;
1170                 pinfo = info;
1171         }
1172         LeaveCriticalSection(&pinfo_cs);
1173
1174         return (pid_t)pi.dwProcessId;
1175 }
1176
1177 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1178 {
1179         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1180 }
1181
1182 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1183                      const char *dir,
1184                      int fhin, int fhout, int fherr)
1185 {
1186         pid_t pid;
1187         char **path = get_path_split();
1188         char *prog = path_lookup(cmd, path, 0);
1189
1190         if (!prog) {
1191                 errno = ENOENT;
1192                 pid = -1;
1193         }
1194         else {
1195                 const char *interpr = parse_interpreter(prog);
1196
1197                 if (interpr) {
1198                         const char *argv0 = argv[0];
1199                         char *iprog = path_lookup(interpr, path, 1);
1200                         argv[0] = prog;
1201                         if (!iprog) {
1202                                 errno = ENOENT;
1203                                 pid = -1;
1204                         }
1205                         else {
1206                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1207                                                        fhin, fhout, fherr);
1208                                 free(iprog);
1209                         }
1210                         argv[0] = argv0;
1211                 }
1212                 else
1213                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1214                                                fhin, fhout, fherr);
1215                 free(prog);
1216         }
1217         free_path_split(path);
1218         return pid;
1219 }
1220
1221 static int try_shell_exec(const char *cmd, char *const *argv)
1222 {
1223         const char *interpr = parse_interpreter(cmd);
1224         char **path;
1225         char *prog;
1226         int pid = 0;
1227
1228         if (!interpr)
1229                 return 0;
1230         path = get_path_split();
1231         prog = path_lookup(interpr, path, 1);
1232         if (prog) {
1233                 int argc = 0;
1234                 const char **argv2;
1235                 while (argv[argc]) argc++;
1236                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1237                 argv2[0] = (char *)cmd; /* full path to the script file */
1238                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1239                 pid = mingw_spawnv(prog, argv2, 1);
1240                 if (pid >= 0) {
1241                         int status;
1242                         if (waitpid(pid, &status, 0) < 0)
1243                                 status = 255;
1244                         exit(status);
1245                 }
1246                 pid = 1;        /* indicate that we tried but failed */
1247                 free(prog);
1248                 free(argv2);
1249         }
1250         free_path_split(path);
1251         return pid;
1252 }
1253
1254 int mingw_execv(const char *cmd, char *const *argv)
1255 {
1256         /* check if git_command is a shell script */
1257         if (!try_shell_exec(cmd, argv)) {
1258                 int pid, status;
1259
1260                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1261                 if (pid < 0)
1262                         return -1;
1263                 if (waitpid(pid, &status, 0) < 0)
1264                         status = 255;
1265                 exit(status);
1266         }
1267         return -1;
1268 }
1269
1270 int mingw_execvp(const char *cmd, char *const *argv)
1271 {
1272         char **path = get_path_split();
1273         char *prog = path_lookup(cmd, path, 0);
1274
1275         if (prog) {
1276                 mingw_execv(prog, argv);
1277                 free(prog);
1278         } else
1279                 errno = ENOENT;
1280
1281         free_path_split(path);
1282         return -1;
1283 }
1284
1285 int mingw_kill(pid_t pid, int sig)
1286 {
1287         if (pid > 0 && sig == SIGTERM) {
1288                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1289
1290                 if (TerminateProcess(h, -1)) {
1291                         CloseHandle(h);
1292                         return 0;
1293                 }
1294
1295                 errno = err_win_to_posix(GetLastError());
1296                 CloseHandle(h);
1297                 return -1;
1298         } else if (pid > 0 && sig == 0) {
1299                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1300                 if (h) {
1301                         CloseHandle(h);
1302                         return 0;
1303                 }
1304         }
1305
1306         errno = EINVAL;
1307         return -1;
1308 }
1309
1310 /*
1311  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1312  * that service contains a numerical port, or that it is null. It
1313  * does a simple search using gethostbyname, and returns one IPv4 host
1314  * if one was found.
1315  */
1316 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1317                                    const struct addrinfo *hints,
1318                                    struct addrinfo **res)
1319 {
1320         struct hostent *h = NULL;
1321         struct addrinfo *ai;
1322         struct sockaddr_in *sin;
1323
1324         if (node) {
1325                 h = gethostbyname(node);
1326                 if (!h)
1327                         return WSAGetLastError();
1328         }
1329
1330         ai = xmalloc(sizeof(struct addrinfo));
1331         *res = ai;
1332         ai->ai_flags = 0;
1333         ai->ai_family = AF_INET;
1334         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1335         switch (ai->ai_socktype) {
1336         case SOCK_STREAM:
1337                 ai->ai_protocol = IPPROTO_TCP;
1338                 break;
1339         case SOCK_DGRAM:
1340                 ai->ai_protocol = IPPROTO_UDP;
1341                 break;
1342         default:
1343                 ai->ai_protocol = 0;
1344                 break;
1345         }
1346         ai->ai_addrlen = sizeof(struct sockaddr_in);
1347         if (hints && (hints->ai_flags & AI_CANONNAME))
1348                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1349         else
1350                 ai->ai_canonname = NULL;
1351
1352         sin = xmalloc(ai->ai_addrlen);
1353         memset(sin, 0, ai->ai_addrlen);
1354         sin->sin_family = AF_INET;
1355         /* Note: getaddrinfo is supposed to allow service to be a string,
1356          * which should be looked up using getservbyname. This is
1357          * currently not implemented */
1358         if (service)
1359                 sin->sin_port = htons(atoi(service));
1360         if (h)
1361                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1362         else if (hints && (hints->ai_flags & AI_PASSIVE))
1363                 sin->sin_addr.s_addr = INADDR_ANY;
1364         else
1365                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1366         ai->ai_addr = (struct sockaddr *)sin;
1367         ai->ai_next = NULL;
1368         return 0;
1369 }
1370
1371 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1372 {
1373         free(res->ai_canonname);
1374         free(res->ai_addr);
1375         free(res);
1376 }
1377
1378 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1379                                    char *host, DWORD hostlen,
1380                                    char *serv, DWORD servlen, int flags)
1381 {
1382         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1383         if (sa->sa_family != AF_INET)
1384                 return EAI_FAMILY;
1385         if (!host && !serv)
1386                 return EAI_NONAME;
1387
1388         if (host && hostlen > 0) {
1389                 struct hostent *ent = NULL;
1390                 if (!(flags & NI_NUMERICHOST))
1391                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1392                                             sizeof(sin->sin_addr), AF_INET);
1393
1394                 if (ent)
1395                         snprintf(host, hostlen, "%s", ent->h_name);
1396                 else if (flags & NI_NAMEREQD)
1397                         return EAI_NONAME;
1398                 else
1399                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1400         }
1401
1402         if (serv && servlen > 0) {
1403                 struct servent *ent = NULL;
1404                 if (!(flags & NI_NUMERICSERV))
1405                         ent = getservbyport(sin->sin_port,
1406                                             flags & NI_DGRAM ? "udp" : "tcp");
1407
1408                 if (ent)
1409                         snprintf(serv, servlen, "%s", ent->s_name);
1410                 else
1411                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1412         }
1413
1414         return 0;
1415 }
1416
1417 static HMODULE ipv6_dll = NULL;
1418 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1419 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1420                                       const struct addrinfo *hints,
1421                                       struct addrinfo **res);
1422 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1423                                       char *host, DWORD hostlen,
1424                                       char *serv, DWORD servlen, int flags);
1425 /*
1426  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1427  * don't need to try to load that one dynamically.
1428  */
1429
1430 static void socket_cleanup(void)
1431 {
1432         WSACleanup();
1433         if (ipv6_dll)
1434                 FreeLibrary(ipv6_dll);
1435         ipv6_dll = NULL;
1436         ipv6_freeaddrinfo = freeaddrinfo_stub;
1437         ipv6_getaddrinfo = getaddrinfo_stub;
1438         ipv6_getnameinfo = getnameinfo_stub;
1439 }
1440
1441 static void ensure_socket_initialization(void)
1442 {
1443         WSADATA wsa;
1444         static int initialized = 0;
1445         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1446         const char **name;
1447
1448         if (initialized)
1449                 return;
1450
1451         if (WSAStartup(MAKEWORD(2,2), &wsa))
1452                 die("unable to initialize winsock subsystem, error %d",
1453                         WSAGetLastError());
1454
1455         for (name = libraries; *name; name++) {
1456                 ipv6_dll = LoadLibrary(*name);
1457                 if (!ipv6_dll)
1458                         continue;
1459
1460                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1461                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1462                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1463                                                    const struct addrinfo *,
1464                                                    struct addrinfo **))
1465                         GetProcAddress(ipv6_dll, "getaddrinfo");
1466                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1467                                                    socklen_t, char *, DWORD,
1468                                                    char *, DWORD, int))
1469                         GetProcAddress(ipv6_dll, "getnameinfo");
1470                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1471                         FreeLibrary(ipv6_dll);
1472                         ipv6_dll = NULL;
1473                 } else
1474                         break;
1475         }
1476         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1477                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1478                 ipv6_getaddrinfo = getaddrinfo_stub;
1479                 ipv6_getnameinfo = getnameinfo_stub;
1480         }
1481
1482         atexit(socket_cleanup);
1483         initialized = 1;
1484 }
1485
1486 #undef gethostname
1487 int mingw_gethostname(char *name, int namelen)
1488 {
1489     ensure_socket_initialization();
1490     return gethostname(name, namelen);
1491 }
1492
1493 #undef gethostbyname
1494 struct hostent *mingw_gethostbyname(const char *host)
1495 {
1496         ensure_socket_initialization();
1497         return gethostbyname(host);
1498 }
1499
1500 void mingw_freeaddrinfo(struct addrinfo *res)
1501 {
1502         ipv6_freeaddrinfo(res);
1503 }
1504
1505 int mingw_getaddrinfo(const char *node, const char *service,
1506                       const struct addrinfo *hints, struct addrinfo **res)
1507 {
1508         ensure_socket_initialization();
1509         return ipv6_getaddrinfo(node, service, hints, res);
1510 }
1511
1512 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1513                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1514                       int flags)
1515 {
1516         ensure_socket_initialization();
1517         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1518 }
1519
1520 int mingw_socket(int domain, int type, int protocol)
1521 {
1522         int sockfd;
1523         SOCKET s;
1524
1525         ensure_socket_initialization();
1526         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1527         if (s == INVALID_SOCKET) {
1528                 /*
1529                  * WSAGetLastError() values are regular BSD error codes
1530                  * biased by WSABASEERR.
1531                  * However, strerror() does not know about networking
1532                  * specific errors, which are values beginning at 38 or so.
1533                  * Therefore, we choose to leave the biased error code
1534                  * in errno so that _if_ someone looks up the code somewhere,
1535                  * then it is at least the number that are usually listed.
1536                  */
1537                 errno = WSAGetLastError();
1538                 return -1;
1539         }
1540         /* convert into a file descriptor */
1541         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1542                 closesocket(s);
1543                 return error("unable to make a socket file descriptor: %s",
1544                         strerror(errno));
1545         }
1546         return sockfd;
1547 }
1548
1549 #undef connect
1550 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1551 {
1552         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1553         return connect(s, sa, sz);
1554 }
1555
1556 #undef bind
1557 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1558 {
1559         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1560         return bind(s, sa, sz);
1561 }
1562
1563 #undef setsockopt
1564 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1565 {
1566         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1567         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1568 }
1569
1570 #undef shutdown
1571 int mingw_shutdown(int sockfd, int how)
1572 {
1573         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1574         return shutdown(s, how);
1575 }
1576
1577 #undef listen
1578 int mingw_listen(int sockfd, int backlog)
1579 {
1580         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1581         return listen(s, backlog);
1582 }
1583
1584 #undef accept
1585 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1586 {
1587         int sockfd2;
1588
1589         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1590         SOCKET s2 = accept(s1, sa, sz);
1591
1592         /* convert into a file descriptor */
1593         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1594                 int err = errno;
1595                 closesocket(s2);
1596                 return error("unable to make a socket file descriptor: %s",
1597                         strerror(err));
1598         }
1599         return sockfd2;
1600 }
1601
1602 #undef rename
1603 int mingw_rename(const char *pold, const char *pnew)
1604 {
1605         DWORD attrs, gle;
1606         int tries = 0;
1607         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1608         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1609                 return -1;
1610
1611         /*
1612          * Try native rename() first to get errno right.
1613          * It is based on MoveFile(), which cannot overwrite existing files.
1614          */
1615         if (!_wrename(wpold, wpnew))
1616                 return 0;
1617         if (errno != EEXIST)
1618                 return -1;
1619 repeat:
1620         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1621                 return 0;
1622         /* TODO: translate more errors */
1623         gle = GetLastError();
1624         if (gle == ERROR_ACCESS_DENIED &&
1625             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1626                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1627                         errno = EISDIR;
1628                         return -1;
1629                 }
1630                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1631                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1632                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1633                                 return 0;
1634                         gle = GetLastError();
1635                         /* revert file attributes on failure */
1636                         SetFileAttributesW(wpnew, attrs);
1637                 }
1638         }
1639         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1640                 /*
1641                  * We assume that some other process had the source or
1642                  * destination file open at the wrong moment and retry.
1643                  * In order to give the other process a higher chance to
1644                  * complete its operation, we give up our time slice now.
1645                  * If we have to retry again, we do sleep a bit.
1646                  */
1647                 Sleep(delay[tries]);
1648                 tries++;
1649                 goto repeat;
1650         }
1651         if (gle == ERROR_ACCESS_DENIED &&
1652                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1653                        "Should I try again?", pold, pnew))
1654                 goto repeat;
1655
1656         errno = EACCES;
1657         return -1;
1658 }
1659
1660 /*
1661  * Note that this doesn't return the actual pagesize, but
1662  * the allocation granularity. If future Windows specific git code
1663  * needs the real getpagesize function, we need to find another solution.
1664  */
1665 int mingw_getpagesize(void)
1666 {
1667         SYSTEM_INFO si;
1668         GetSystemInfo(&si);
1669         return si.dwAllocationGranularity;
1670 }
1671
1672 struct passwd *getpwuid(int uid)
1673 {
1674         static char user_name[100];
1675         static struct passwd p;
1676
1677         DWORD len = sizeof(user_name);
1678         if (!GetUserName(user_name, &len))
1679                 return NULL;
1680         p.pw_name = user_name;
1681         p.pw_gecos = "unknown";
1682         p.pw_dir = NULL;
1683         return &p;
1684 }
1685
1686 static HANDLE timer_event;
1687 static HANDLE timer_thread;
1688 static int timer_interval;
1689 static int one_shot;
1690 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1691
1692 /* The timer works like this:
1693  * The thread, ticktack(), is a trivial routine that most of the time
1694  * only waits to receive the signal to terminate. The main thread tells
1695  * the thread to terminate by setting the timer_event to the signalled
1696  * state.
1697  * But ticktack() interrupts the wait state after the timer's interval
1698  * length to call the signal handler.
1699  */
1700
1701 static unsigned __stdcall ticktack(void *dummy)
1702 {
1703         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1704                 mingw_raise(SIGALRM);
1705                 if (one_shot)
1706                         break;
1707         }
1708         return 0;
1709 }
1710
1711 static int start_timer_thread(void)
1712 {
1713         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1714         if (timer_event) {
1715                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1716                 if (!timer_thread )
1717                         return errno = ENOMEM,
1718                                 error("cannot start timer thread");
1719         } else
1720                 return errno = ENOMEM,
1721                         error("cannot allocate resources for timer");
1722         return 0;
1723 }
1724
1725 static void stop_timer_thread(void)
1726 {
1727         if (timer_event)
1728                 SetEvent(timer_event);  /* tell thread to terminate */
1729         if (timer_thread) {
1730                 int rc = WaitForSingleObject(timer_thread, 1000);
1731                 if (rc == WAIT_TIMEOUT)
1732                         error("timer thread did not terminate timely");
1733                 else if (rc != WAIT_OBJECT_0)
1734                         error("waiting for timer thread failed: %lu",
1735                               GetLastError());
1736                 CloseHandle(timer_thread);
1737         }
1738         if (timer_event)
1739                 CloseHandle(timer_event);
1740         timer_event = NULL;
1741         timer_thread = NULL;
1742 }
1743
1744 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1745 {
1746         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1747 }
1748
1749 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1750 {
1751         static const struct timeval zero;
1752         static int atexit_done;
1753
1754         if (out != NULL)
1755                 return errno = EINVAL,
1756                         error("setitimer param 3 != NULL not implemented");
1757         if (!is_timeval_eq(&in->it_interval, &zero) &&
1758             !is_timeval_eq(&in->it_interval, &in->it_value))
1759                 return errno = EINVAL,
1760                         error("setitimer: it_interval must be zero or eq it_value");
1761
1762         if (timer_thread)
1763                 stop_timer_thread();
1764
1765         if (is_timeval_eq(&in->it_value, &zero) &&
1766             is_timeval_eq(&in->it_interval, &zero))
1767                 return 0;
1768
1769         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1770         one_shot = is_timeval_eq(&in->it_interval, &zero);
1771         if (!atexit_done) {
1772                 atexit(stop_timer_thread);
1773                 atexit_done = 1;
1774         }
1775         return start_timer_thread();
1776 }
1777
1778 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1779 {
1780         if (sig != SIGALRM)
1781                 return errno = EINVAL,
1782                         error("sigaction only implemented for SIGALRM");
1783         if (out != NULL)
1784                 return errno = EINVAL,
1785                         error("sigaction: param 3 != NULL not implemented");
1786
1787         timer_fn = in->sa_handler;
1788         return 0;
1789 }
1790
1791 #undef signal
1792 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1793 {
1794         sig_handler_t old;
1795
1796         switch (sig) {
1797         case SIGALRM:
1798                 old = timer_fn;
1799                 timer_fn = handler;
1800                 break;
1801
1802         case SIGINT:
1803                 old = sigint_fn;
1804                 sigint_fn = handler;
1805                 break;
1806
1807         default:
1808                 return signal(sig, handler);
1809         }
1810
1811         return old;
1812 }
1813
1814 #undef raise
1815 int mingw_raise(int sig)
1816 {
1817         switch (sig) {
1818         case SIGALRM:
1819                 if (timer_fn == SIG_DFL) {
1820                         if (isatty(STDERR_FILENO))
1821                                 fputs("Alarm clock\n", stderr);
1822                         exit(128 + SIGALRM);
1823                 } else if (timer_fn != SIG_IGN)
1824                         timer_fn(SIGALRM);
1825                 return 0;
1826
1827         case SIGINT:
1828                 if (sigint_fn == SIG_DFL)
1829                         exit(128 + SIGINT);
1830                 else if (sigint_fn != SIG_IGN)
1831                         sigint_fn(SIGINT);
1832                 return 0;
1833
1834         default:
1835                 return raise(sig);
1836         }
1837 }
1838
1839
1840 static const char *make_backslash_path(const char *path)
1841 {
1842         static char buf[PATH_MAX + 1];
1843         char *c;
1844
1845         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1846                 die("Too long path: %.*s", 60, path);
1847
1848         for (c = buf; *c; c++) {
1849                 if (*c == '/')
1850                         *c = '\\';
1851         }
1852         return buf;
1853 }
1854
1855 void mingw_open_html(const char *unixpath)
1856 {
1857         const char *htmlpath = make_backslash_path(unixpath);
1858         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1859                         const char *, const char *, const char *, INT);
1860         T ShellExecute;
1861         HMODULE shell32;
1862         int r;
1863
1864         shell32 = LoadLibrary("shell32.dll");
1865         if (!shell32)
1866                 die("cannot load shell32.dll");
1867         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1868         if (!ShellExecute)
1869                 die("cannot run browser");
1870
1871         printf("Launching default browser to display HTML ...\n");
1872         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1873         FreeLibrary(shell32);
1874         /* see the MSDN documentation referring to the result codes here */
1875         if (r <= 32) {
1876                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1877         }
1878 }
1879
1880 int link(const char *oldpath, const char *newpath)
1881 {
1882         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1883         static T create_hard_link = NULL;
1884         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1885         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1886                 xutftowcs_path(wnewpath, newpath) < 0)
1887                 return -1;
1888
1889         if (!create_hard_link) {
1890                 create_hard_link = (T) GetProcAddress(
1891                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1892                 if (!create_hard_link)
1893                         create_hard_link = (T)-1;
1894         }
1895         if (create_hard_link == (T)-1) {
1896                 errno = ENOSYS;
1897                 return -1;
1898         }
1899         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1900                 errno = err_win_to_posix(GetLastError());
1901                 return -1;
1902         }
1903         return 0;
1904 }
1905
1906 pid_t waitpid(pid_t pid, int *status, int options)
1907 {
1908         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1909             FALSE, pid);
1910         if (!h) {
1911                 errno = ECHILD;
1912                 return -1;
1913         }
1914
1915         if (pid > 0 && options & WNOHANG) {
1916                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1917                         CloseHandle(h);
1918                         return 0;
1919                 }
1920                 options &= ~WNOHANG;
1921         }
1922
1923         if (options == 0) {
1924                 struct pinfo_t **ppinfo;
1925                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1926                         CloseHandle(h);
1927                         return 0;
1928                 }
1929
1930                 if (status)
1931                         GetExitCodeProcess(h, (LPDWORD)status);
1932
1933                 EnterCriticalSection(&pinfo_cs);
1934
1935                 ppinfo = &pinfo;
1936                 while (*ppinfo) {
1937                         struct pinfo_t *info = *ppinfo;
1938                         if (info->pid == pid) {
1939                                 CloseHandle(info->proc);
1940                                 *ppinfo = info->next;
1941                                 free(info);
1942                                 break;
1943                         }
1944                         ppinfo = &info->next;
1945                 }
1946
1947                 LeaveCriticalSection(&pinfo_cs);
1948
1949                 CloseHandle(h);
1950                 return pid;
1951         }
1952         CloseHandle(h);
1953
1954         errno = EINVAL;
1955         return -1;
1956 }
1957
1958 const char *get_windows_home_directory(void)
1959 {
1960         static const char *home_directory = NULL;
1961         struct strbuf buf = STRBUF_INIT;
1962
1963         if (home_directory)
1964                 return home_directory;
1965
1966         home_directory = getenv("HOME");
1967         if (home_directory && *home_directory)
1968                 return home_directory;
1969
1970         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1971         home_directory = strbuf_detach(&buf, NULL);
1972
1973         return home_directory;
1974 }
1975 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1976 {
1977         int upos = 0, wpos = 0;
1978         const unsigned char *utf = (const unsigned char*) utfs;
1979         if (!utf || !wcs || wcslen < 1) {
1980                 errno = EINVAL;
1981                 return -1;
1982         }
1983         /* reserve space for \0 */
1984         wcslen--;
1985         if (utflen < 0)
1986                 utflen = INT_MAX;
1987
1988         while (upos < utflen) {
1989                 int c = utf[upos++] & 0xff;
1990                 if (utflen == INT_MAX && c == 0)
1991                         break;
1992
1993                 if (wpos >= wcslen) {
1994                         wcs[wpos] = 0;
1995                         errno = ERANGE;
1996                         return -1;
1997                 }
1998
1999                 if (c < 0x80) {
2000                         /* ASCII */
2001                         wcs[wpos++] = c;
2002                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2003                                 (utf[upos] & 0xc0) == 0x80) {
2004                         /* 2-byte utf-8 */
2005                         c = ((c & 0x1f) << 6);
2006                         c |= (utf[upos++] & 0x3f);
2007                         wcs[wpos++] = c;
2008                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2009                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2010                                 (utf[upos] & 0xc0) == 0x80 &&
2011                                 (utf[upos + 1] & 0xc0) == 0x80) {
2012                         /* 3-byte utf-8 */
2013                         c = ((c & 0x0f) << 12);
2014                         c |= ((utf[upos++] & 0x3f) << 6);
2015                         c |= (utf[upos++] & 0x3f);
2016                         wcs[wpos++] = c;
2017                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2018                                 wpos + 1 < wcslen &&
2019                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2020                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2021                                 (utf[upos] & 0xc0) == 0x80 &&
2022                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2023                                 (utf[upos + 2] & 0xc0) == 0x80) {
2024                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2025                         c = ((c & 0x07) << 18);
2026                         c |= ((utf[upos++] & 0x3f) << 12);
2027                         c |= ((utf[upos++] & 0x3f) << 6);
2028                         c |= (utf[upos++] & 0x3f);
2029                         c -= 0x10000;
2030                         wcs[wpos++] = 0xd800 | (c >> 10);
2031                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2032                 } else if (c >= 0xa0) {
2033                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2034                         wcs[wpos++] = c;
2035                 } else {
2036                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2037                         static const char *hex = "0123456789abcdef";
2038                         wcs[wpos++] = hex[c >> 4];
2039                         if (wpos < wcslen)
2040                                 wcs[wpos++] = hex[c & 0x0f];
2041                 }
2042         }
2043         wcs[wpos] = 0;
2044         return wpos;
2045 }
2046
2047 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2048 {
2049         if (!wcs || !utf || utflen < 1) {
2050                 errno = EINVAL;
2051                 return -1;
2052         }
2053         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2054         if (utflen)
2055                 return utflen - 1;
2056         errno = ERANGE;
2057         return -1;
2058 }
2059
2060 /*
2061  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2062  * mingw startup code, see init.c in mingw runtime).
2063  */
2064 int _CRT_glob = 0;
2065
2066 typedef struct {
2067         int newmode;
2068 } _startupinfo;
2069
2070 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2071                 _startupinfo *si);
2072
2073 static NORETURN void die_startup()
2074 {
2075         fputs("fatal: not enough memory for initialization", stderr);
2076         exit(128);
2077 }
2078
2079 static void *malloc_startup(size_t size)
2080 {
2081         void *result = malloc(size);
2082         if (!result)
2083                 die_startup();
2084         return result;
2085 }
2086
2087 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2088 {
2089         len = xwcstoutf(buffer, wcs, len) + 1;
2090         return memcpy(malloc_startup(len), buffer, len);
2091 }
2092
2093 void mingw_startup()
2094 {
2095         int i, maxlen, argc;
2096         char *buffer;
2097         wchar_t **wenv, **wargv;
2098         _startupinfo si;
2099
2100         /* get wide char arguments and environment */
2101         si.newmode = 0;
2102         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2103                 die_startup();
2104
2105         /* determine size of argv and environ conversion buffer */
2106         maxlen = wcslen(_wpgmptr);
2107         for (i = 1; i < argc; i++)
2108                 maxlen = max(maxlen, wcslen(wargv[i]));
2109         for (i = 0; wenv[i]; i++)
2110                 maxlen = max(maxlen, wcslen(wenv[i]));
2111
2112         /*
2113          * nedmalloc can't free CRT memory, allocate resizable environment
2114          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2115          * use it while initializing the environment itself.
2116          */
2117         environ_size = i + 1;
2118         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2119         environ = malloc_startup(environ_alloc);
2120
2121         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2122         maxlen = 3 * maxlen + 1;
2123         buffer = malloc_startup(maxlen);
2124
2125         /* convert command line arguments and environment to UTF-8 */
2126         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2127         for (i = 1; i < argc; i++)
2128                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2129         for (i = 0; wenv[i]; i++)
2130                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2131         environ[i] = NULL;
2132         free(buffer);
2133
2134         /* sort environment for O(log n) getenv / putenv */
2135         qsort(environ, i, sizeof(char*), compareenv);
2136
2137         /* fix Windows specific environment settings */
2138
2139         /* on Windows it is TMP and TEMP */
2140         if (!getenv("TMPDIR")) {
2141                 const char *tmp = getenv("TMP");
2142                 if (!tmp)
2143                         tmp = getenv("TEMP");
2144                 if (tmp)
2145                         setenv("TMPDIR", tmp, 1);
2146         }
2147
2148         /* simulate TERM to enable auto-color (see color.c) */
2149         if (!getenv("TERM"))
2150                 setenv("TERM", "winansi", 1);
2151
2152         /* initialize critical section for waitpid pinfo_t list */
2153         InitializeCriticalSection(&pinfo_cs);
2154
2155         /* set up default file mode and file modes for stdin/out/err */
2156         _fmode = _O_BINARY;
2157         _setmode(_fileno(stdin), _O_BINARY);
2158         _setmode(_fileno(stdout), _O_BINARY);
2159         _setmode(_fileno(stderr), _O_BINARY);
2160
2161         /* initialize Unicode console */
2162         winansi_init();
2163 }
2164
2165 int mingw_offset_1st_component(const char *path)
2166 {
2167         int offset = 0;
2168         if (has_dos_drive_prefix(path))
2169                 offset = 2;
2170
2171         /* unc paths */
2172         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
2173
2174                 /* skip server name */
2175                 char *pos = strpbrk(path + 2, "\\/");
2176                 if (!pos)
2177                         return 0; /* Error: malformed unc path */
2178
2179                 do {
2180                         pos++;
2181                 } while (*pos && !is_dir_sep(*pos));
2182
2183                 offset = pos - path;
2184         }
2185
2186         return offset + is_dir_sep(path[offset]);
2187 }