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                         return GetLastError() == ERROR_NO_MORE_FILES;
 248         FindClose(handle);
 249         return 0;
 250 }
 251
 252 int mingw_rmdir(const char *pathname)
 253 {
 254         int ret, tries = 0;
 255         wchar_t wpathname[MAX_PATH];
 256         if (xutftowcs_path(wpathname, pathname) < 0)
 257                 return -1;
 258
 259         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 260                 if (!is_file_in_use_error(GetLastError()))
 261                         errno = err_win_to_posix(GetLastError());
 262                 if (errno != EACCES)
 263                         break;
 264                 if (!is_dir_empty(wpathname)) {
 265                         errno = ENOTEMPTY;
 266                         break;
 267                 }
 268                 /*
 269                  * We assume that some other process had the source or
 270                  * destination file open at the wrong moment and retry.
 271                  * In order to give the other process a higher chance to
 272                  * complete its operation, we give up our time slice now.
 273                  * If we have to retry again, we do sleep a bit.
 274                  */
 275                 Sleep(delay[tries]);
 276                 tries++;
 277         }
 278         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 279                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 280                         "Should I try again?", pathname))
 281                ret = _wrmdir(wpathname);
 282         return ret;
 283 }
 284
 285 static int make_hidden(const wchar_t *path)
 286 {
 287         DWORD attribs = GetFileAttributesW(path);
 288         if (SetFileAttributesW(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 289                 return 0;
 290         errno = err_win_to_posix(GetLastError());
 291         return -1;
 292 }
 293
 294 void mingw_mark_as_git_dir(const char *dir)
 295 {
 296         wchar_t wdir[MAX_PATH];
 297         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository())
 298                 if (xutftowcs_path(wdir, dir) < 0 || make_hidden(wdir))
 299                         warning("Failed to make '%s' hidden", dir);
 300         git_config_set("core.hideDotFiles",
 301                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 302                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 303                  "dotGitOnly" : "true"));
 304 }
 305
 306 int mingw_mkdir(const char *path, int mode)
 307 {
 308         int ret;
 309         wchar_t wpath[MAX_PATH];
 310         if (xutftowcs_path(wpath, path) < 0)
 311                 return -1;
 312         ret = _wmkdir(wpath);
 313         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 314                 /*
 315                  * In Windows a file or dir starting with a dot is not
 316                  * automatically hidden. So lets mark it as hidden when
 317                  * such a directory is created.
 318                  */
 319                 const char *start = basename((char*)path);
 320                 if (*start == '.')
 321                         return make_hidden(wpath);
 322         }
 323         return ret;
 324 }
 325
 326 int mingw_open (const char *filename, int oflags, ...)
 327 {
 328         va_list args;
 329         unsigned mode;
 330         int fd;
 331         wchar_t wfilename[MAX_PATH];
 332
 333         va_start(args, oflags);
 334         mode = va_arg(args, int);
 335         va_end(args);
 336
 337         if (filename && !strcmp(filename, "/dev/null"))
 338                 filename = "nul";
 339
 340         if (xutftowcs_path(wfilename, filename) < 0)
 341                 return -1;
 342         fd = _wopen(wfilename, oflags, mode);
 343
 344         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 345                 DWORD attrs = GetFileAttributesW(wfilename);
 346                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 347                         errno = EISDIR;
 348         }
 349         if ((oflags & O_CREAT) && fd >= 0 &&
 350             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 351                 /*
 352                  * In Windows a file or dir starting with a dot is not
 353                  * automatically hidden. So lets mark it as hidden when
 354                  * such a file is created.
 355                  */
 356                 const char *start = basename((char*)filename);
 357                 if (*start == '.' && make_hidden(wfilename))
 358                         warning("Could not mark '%s' as hidden.", filename);
 359         }
 360         return fd;
 361 }
 362
 363 #undef write
 364 ssize_t mingw_write(int fd, const void *buf, size_t count)
 365 {
 366         /*
 367          * While write() calls to a file on a local disk are translated
 368          * into WriteFile() calls with a maximum size of 64KB on Windows
 369          * XP and 256KB on Vista, no such cap is placed on writes to
 370          * files over the network on Windows XP.  Unfortunately, there
 371          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 372          * bigger writes fail on Windows XP.
 373          * So we cap to a nice 31MB here to avoid write failures over
 374          * the net without changing the number of WriteFile() calls in
 375          * the local case.
 376          */
 377         return write(fd, buf, min(count, 31 * 1024 * 1024));
 378 }
 379
 380 static BOOL WINAPI ctrl_ignore(DWORD type)
 381 {
 382         return TRUE;
 383 }
 384
 385 #undef fgetc
 386 int mingw_fgetc(FILE *stream)
 387 {
 388         int ch;
 389         if (!isatty(_fileno(stream)))
 390                 return fgetc(stream);
 391
 392         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 393         while (1) {
 394                 ch = fgetc(stream);
 395                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 396                         break;
 397
 398                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 399                 mingw_raise(SIGINT);
 400         }
 401         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 402         return ch;
 403 }
 404
 405 #undef fopen
 406 FILE *mingw_fopen (const char *filename, const char *otype)
 407 {
 408         int hide = 0;
 409         FILE *file;
 410         wchar_t wfilename[MAX_PATH], wotype[4];
 411         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 412             basename((char*)filename)[0] == '.')
 413                 hide = access(filename, F_OK);
 414         if (filename && !strcmp(filename, "/dev/null"))
 415                 filename = "nul";
 416         if (xutftowcs_path(wfilename, filename) < 0 ||
 417                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 418                 return NULL;
 419         file = _wfopen(wfilename, wotype);
 420         if (file && hide && make_hidden(wfilename))
 421                 warning("Could not mark '%s' as hidden.", filename);
 422         return file;
 423 }
 424
 425 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 426 {
 427         int hide = 0;
 428         FILE *file;
 429         wchar_t wfilename[MAX_PATH], wotype[4];
 430         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 431             basename((char*)filename)[0] == '.')
 432                 hide = access(filename, F_OK);
 433         if (filename && !strcmp(filename, "/dev/null"))
 434                 filename = "nul";
 435         if (xutftowcs_path(wfilename, filename) < 0 ||
 436                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 437                 return NULL;
 438         file = _wfreopen(wfilename, wotype, stream);
 439         if (file && hide && make_hidden(wfilename))
 440                 warning("Could not mark '%s' as hidden.", filename);
 441         return file;
 442 }
 443
 444 #undef fflush
 445 int mingw_fflush(FILE *stream)
 446 {
 447         int ret = fflush(stream);
 448
 449         /*
 450          * write() is used behind the scenes of stdio output functions.
 451          * Since git code does not check for errors after each stdio write
 452          * operation, it can happen that write() is called by a later
 453          * stdio function even if an earlier write() call failed. In the
 454          * case of a pipe whose readable end was closed, only the first
 455          * call to write() reports EPIPE on Windows. Subsequent write()
 456          * calls report EINVAL. It is impossible to notice whether this
 457          * fflush invocation triggered such a case, therefore, we have to
 458          * catch all EINVAL errors whole-sale.
 459          */
 460         if (ret && errno == EINVAL)
 461                 errno = EPIPE;
 462
 463         return ret;
 464 }
 465
 466 int mingw_access(const char *filename, int mode)
 467 {
 468         wchar_t wfilename[MAX_PATH];
 469         if (xutftowcs_path(wfilename, filename) < 0)
 470                 return -1;
 471         /* X_OK is not supported by the MSVCRT version */
 472         return _waccess(wfilename, mode & ~X_OK);
 473 }
 474
 475 int mingw_chdir(const char *dirname)
 476 {
 477         wchar_t wdirname[MAX_PATH];
 478         if (xutftowcs_path(wdirname, dirname) < 0)
 479                 return -1;
 480         return _wchdir(wdirname);
 481 }
 482
 483 int mingw_chmod(const char *filename, int mode)
 484 {
 485         wchar_t wfilename[MAX_PATH];
 486         if (xutftowcs_path(wfilename, filename) < 0)
 487                 return -1;
 488         return _wchmod(wfilename, mode);
 489 }
 490
 491 /*
 492  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 493  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 494  */
 495 static inline long long filetime_to_hnsec(const FILETIME *ft)
 496 {
 497         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 498         /* Windows to Unix Epoch conversion */
 499         return winTime - 116444736000000000LL;
 500 }
 501
 502 static inline time_t filetime_to_time_t(const FILETIME *ft)
 503 {
 504         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 505 }
 506
 507 /* We keep the do_lstat code in a separate function to avoid recursion.
 508  * When a path ends with a slash, the stat will fail with ENOENT. In
 509  * this case, we strip the trailing slashes and stat again.
 510  *
 511  * If follow is true then act like stat() and report on the link
 512  * target. Otherwise report on the link itself.
 513  */
 514 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 515 {
 516         WIN32_FILE_ATTRIBUTE_DATA fdata;
 517         wchar_t wfilename[MAX_PATH];
 518         if (xutftowcs_path(wfilename, file_name) < 0)
 519                 return -1;
 520
 521         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 522                 buf->st_ino = 0;
 523                 buf->st_gid = 0;
 524                 buf->st_uid = 0;
 525                 buf->st_nlink = 1;
 526                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 527                 buf->st_size = fdata.nFileSizeLow |
 528                         (((off_t)fdata.nFileSizeHigh)<<32);
 529                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 530                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 531                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 532                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 533                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 534                         WIN32_FIND_DATAW findbuf;
 535                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 536                         if (handle != INVALID_HANDLE_VALUE) {
 537                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 538                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 539                                         if (follow) {
 540                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 541                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 542                                         } else {
 543                                                 buf->st_mode = S_IFLNK;
 544                                         }
 545                                         buf->st_mode |= S_IREAD;
 546                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 547                                                 buf->st_mode |= S_IWRITE;
 548                                 }
 549                                 FindClose(handle);
 550                         }
 551                 }
 552                 return 0;
 553         }
 554         switch (GetLastError()) {
 555         case ERROR_ACCESS_DENIED:
 556         case ERROR_SHARING_VIOLATION:
 557         case ERROR_LOCK_VIOLATION:
 558         case ERROR_SHARING_BUFFER_EXCEEDED:
 559                 errno = EACCES;
 560                 break;
 561         case ERROR_BUFFER_OVERFLOW:
 562                 errno = ENAMETOOLONG;
 563                 break;
 564         case ERROR_NOT_ENOUGH_MEMORY:
 565                 errno = ENOMEM;
 566                 break;
 567         default:
 568                 errno = ENOENT;
 569                 break;
 570         }
 571         return -1;
 572 }
 573
 574 /* We provide our own lstat/fstat functions, since the provided
 575  * lstat/fstat functions are so slow. These stat functions are
 576  * tailored for Git's usage (read: fast), and are not meant to be
 577  * complete. Note that Git stat()s are redirected to mingw_lstat()
 578  * too, since Windows doesn't really handle symlinks that well.
 579  */
 580 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 581 {
 582         int namelen;
 583         char alt_name[PATH_MAX];
 584
 585         if (!do_lstat(follow, file_name, buf))
 586                 return 0;
 587
 588         /* if file_name ended in a '/', Windows returned ENOENT;
 589          * try again without trailing slashes
 590          */
 591         if (errno != ENOENT)
 592                 return -1;
 593
 594         namelen = strlen(file_name);
 595         if (namelen && file_name[namelen-1] != '/')
 596                 return -1;
 597         while (namelen && file_name[namelen-1] == '/')
 598                 --namelen;
 599         if (!namelen || namelen >= PATH_MAX)
 600                 return -1;
 601
 602         memcpy(alt_name, file_name, namelen);
 603         alt_name[namelen] = 0;
 604         return do_lstat(follow, alt_name, buf);
 605 }
 606
 607 int mingw_lstat(const char *file_name, struct stat *buf)
 608 {
 609         return do_stat_internal(0, file_name, buf);
 610 }
 611 int mingw_stat(const char *file_name, struct stat *buf)
 612 {
 613         return do_stat_internal(1, file_name, buf);
 614 }
 615
 616 #undef fstat
 617 int mingw_fstat(int fd, struct stat *buf)
 618 {
 619         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 620         BY_HANDLE_FILE_INFORMATION fdata;
 621
 622         if (fh == INVALID_HANDLE_VALUE) {
 623                 errno = EBADF;
 624                 return -1;
 625         }
 626         /* direct non-file handles to MS's fstat() */
 627         if (GetFileType(fh) != FILE_TYPE_DISK)
 628                 return _fstati64(fd, buf);
 629
 630         if (GetFileInformationByHandle(fh, &fdata)) {
 631                 buf->st_ino = 0;
 632                 buf->st_gid = 0;
 633                 buf->st_uid = 0;
 634                 buf->st_nlink = 1;
 635                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 636                 buf->st_size = fdata.nFileSizeLow |
 637                         (((off_t)fdata.nFileSizeHigh)<<32);
 638                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 639                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 640                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 641                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 642                 return 0;
 643         }
 644         errno = EBADF;
 645         return -1;
 646 }
 647
 648 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 649 {
 650         long long winTime = t * 10000000LL + 116444736000000000LL;
 651         ft->dwLowDateTime = winTime;
 652         ft->dwHighDateTime = winTime >> 32;
 653 }
 654
 655 int mingw_utime (const char *file_name, const struct utimbuf *times)
 656 {
 657         FILETIME mft, aft;
 658         int fh, rc;
 659         DWORD attrs;
 660         wchar_t wfilename[MAX_PATH];
 661         if (xutftowcs_path(wfilename, file_name) < 0)
 662                 return -1;
 663
 664         /* must have write permission */
 665         attrs = GetFileAttributesW(wfilename);
 666         if (attrs != INVALID_FILE_ATTRIBUTES &&
 667             (attrs & FILE_ATTRIBUTE_READONLY)) {
 668                 /* ignore errors here; open() will report them */
 669                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 670         }
 671
 672         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 673                 rc = -1;
 674                 goto revert_attrs;
 675         }
 676
 677         if (times) {
 678                 time_t_to_filetime(times->modtime, &mft);
 679                 time_t_to_filetime(times->actime, &aft);
 680         } else {
 681                 GetSystemTimeAsFileTime(&mft);
 682                 aft = mft;
 683         }
 684         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 685                 errno = EINVAL;
 686                 rc = -1;
 687         } else
 688                 rc = 0;
 689         close(fh);
 690
 691 revert_attrs:
 692         if (attrs != INVALID_FILE_ATTRIBUTES &&
 693             (attrs & FILE_ATTRIBUTE_READONLY)) {
 694                 /* ignore errors again */
 695                 SetFileAttributesW(wfilename, attrs);
 696         }
 697         return rc;
 698 }
 699
 700 unsigned int sleep (unsigned int seconds)
 701 {
 702         Sleep(seconds*1000);
 703         return 0;
 704 }
 705
 706 char *mingw_mktemp(char *template)
 707 {
 708         wchar_t wtemplate[MAX_PATH];
 709         if (xutftowcs_path(wtemplate, template) < 0)
 710                 return NULL;
 711         if (!_wmktemp(wtemplate))
 712                 return NULL;
 713         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 714                 return NULL;
 715         return template;
 716 }
 717
 718 int mkstemp(char *template)
 719 {
 720         char *filename = mktemp(template);
 721         if (filename == NULL)
 722                 return -1;
 723         return open(filename, O_RDWR | O_CREAT, 0600);
 724 }
 725
 726 int gettimeofday(struct timeval *tv, void *tz)
 727 {
 728         FILETIME ft;
 729         long long hnsec;
 730
 731         GetSystemTimeAsFileTime(&ft);
 732         hnsec = filetime_to_hnsec(&ft);
 733         tv->tv_sec = hnsec / 10000000;
 734         tv->tv_usec = (hnsec % 10000000) / 10;
 735         return 0;
 736 }
 737
 738 int pipe(int filedes[2])
 739 {
 740         HANDLE h[2];
 741
 742         /* this creates non-inheritable handles */
 743         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 744                 errno = err_win_to_posix(GetLastError());
 745                 return -1;
 746         }
 747         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 748         if (filedes[0] < 0) {
 749                 CloseHandle(h[0]);
 750                 CloseHandle(h[1]);
 751                 return -1;
 752         }
 753         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 754         if (filedes[0] < 0) {
 755                 close(filedes[0]);
 756                 CloseHandle(h[1]);
 757                 return -1;
 758         }
 759         return 0;
 760 }
 761
 762 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 763 {
 764         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 765         memcpy(result, gmtime(timep), sizeof(struct tm));
 766         return result;
 767 }
 768
 769 struct tm *localtime_r(const time_t *timep, struct tm *result)
 770 {
 771         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 772         memcpy(result, localtime(timep), sizeof(struct tm));
 773         return result;
 774 }
 775
 776 char *mingw_getcwd(char *pointer, int len)
 777 {
 778         int i;
 779         wchar_t wpointer[MAX_PATH];
 780         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 781                 return NULL;
 782         if (xwcstoutf(pointer, wpointer, len) < 0)
 783                 return NULL;
 784         for (i = 0; pointer[i]; i++)
 785                 if (pointer[i] == '\\')
 786                         pointer[i] = '/';
 787         return pointer;
 788 }
 789
 790 #undef getenv
 791 char *mingw_getenv(const char *name)
 792 {
 793         char *result = getenv(name);
 794         if (!result && !strcmp(name, "TMPDIR")) {
 795                 /* on Windows it is TMP and TEMP */
 796                 result = getenv("TMP");
 797                 if (!result)
 798                         result = getenv("TEMP");
 799         }
 800         else if (!result && !strcmp(name, "TERM")) {
 801                 /* simulate TERM to enable auto-color (see color.c) */
 802                 result = "winansi";
 803         }
 804         return result;
 805 }
 806
 807 /*
 808  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 809  * (Parsing C++ Command-Line Arguments)
 810  */
 811 static const char *quote_arg(const char *arg)
 812 {
 813         /* count chars to quote */
 814         int len = 0, n = 0;
 815         int force_quotes = 0;
 816         char *q, *d;
 817         const char *p = arg;
 818         if (!*p) force_quotes = 1;
 819         while (*p) {
 820                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 821                         force_quotes = 1;
 822                 else if (*p == '"')
 823                         n++;
 824                 else if (*p == '\\') {
 825                         int count = 0;
 826                         while (*p == '\\') {
 827                                 count++;
 828                                 p++;
 829                                 len++;
 830                         }
 831                         if (*p == '"')
 832                                 n += count*2 + 1;
 833                         continue;
 834                 }
 835                 len++;
 836                 p++;
 837         }
 838         if (!force_quotes && n == 0)
 839                 return arg;
 840
 841         /* insert \ where necessary */
 842         d = q = xmalloc(len+n+3);
 843         *d++ = '"';
 844         while (*arg) {
 845                 if (*arg == '"')
 846                         *d++ = '\\';
 847                 else if (*arg == '\\') {
 848                         int count = 0;
 849                         while (*arg == '\\') {
 850                                 count++;
 851                                 *d++ = *arg++;
 852                         }
 853                         if (*arg == '"') {
 854                                 while (count-- > 0)
 855                                         *d++ = '\\';
 856                                 *d++ = '\\';
 857                         }
 858                 }
 859                 *d++ = *arg++;
 860         }
 861         *d++ = '"';
 862         *d++ = 0;
 863         return q;
 864 }
 865
 866 static const char *parse_interpreter(const char *cmd)
 867 {
 868         static char buf[100];
 869         char *p, *opt;
 870         int n, fd;
 871
 872         /* don't even try a .exe */
 873         n = strlen(cmd);
 874         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 875                 return NULL;
 876
 877         fd = open(cmd, O_RDONLY);
 878         if (fd < 0)
 879                 return NULL;
 880         n = read(fd, buf, sizeof(buf)-1);
 881         close(fd);
 882         if (n < 4)      /* at least '#!/x' and not error */
 883                 return NULL;
 884
 885         if (buf[0] != '#' || buf[1] != '!')
 886                 return NULL;
 887         buf[n] = '\0';
 888         p = buf + strcspn(buf, "\r\n");
 889         if (!*p)
 890                 return NULL;
 891
 892         *p = '\0';
 893         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 894                 return NULL;
 895         /* strip options */
 896         if ((opt = strchr(p+1, ' ')))
 897                 *opt = '\0';
 898         return p+1;
 899 }
 900
 901 /*
 902  * Splits the PATH into parts.
 903  */
 904 static char **get_path_split(void)
 905 {
 906         char *p, **path, *envpath = getenv("PATH");
 907         int i, n = 0;
 908
 909         if (!envpath || !*envpath)
 910                 return NULL;
 911
 912         envpath = xstrdup(envpath);
 913         p = envpath;
 914         while (p) {
 915                 char *dir = p;
 916                 p = strchr(p, ';');
 917                 if (p) *p++ = '\0';
 918                 if (*dir) {     /* not earlier, catches series of ; */
 919                         ++n;
 920                 }
 921         }
 922         if (!n)
 923                 return NULL;
 924
 925         path = xmalloc((n+1)*sizeof(char *));
 926         p = envpath;
 927         i = 0;
 928         do {
 929                 if (*p)
 930                         path[i++] = xstrdup(p);
 931                 p = p+strlen(p)+1;
 932         } while (i < n);
 933         path[i] = NULL;
 934
 935         free(envpath);
 936
 937         return path;
 938 }
 939
 940 static void free_path_split(char **path)
 941 {
 942         char **p = path;
 943
 944         if (!path)
 945                 return;
 946
 947         while (*p)
 948                 free(*p++);
 949         free(path);
 950 }
 951
 952 /*
 953  * exe_only means that we only want to detect .exe files, but not scripts
 954  * (which do not have an extension)
 955  */
 956 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 957 {
 958         char path[MAX_PATH];
 959         wchar_t wpath[MAX_PATH];
 960         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 961
 962         if (xutftowcs_path(wpath, path) < 0)
 963                 return NULL;
 964
 965         if (!isexe && _waccess(wpath, F_OK) == 0)
 966                 return xstrdup(path);
 967         path[strlen(path)-4] = '\0';
 968         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
 969
 970                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY))
 971                         return xstrdup(path);
 972         }
 973         return NULL;
 974 }
 975
 976 /*
 977  * Determines the absolute path of cmd using the split path in path.
 978  * If cmd contains a slash or backslash, no lookup is performed.
 979  */
 980 static char *path_lookup(const char *cmd, char **path, int exe_only)
 981 {
 982         char *prog = NULL;
 983         int len = strlen(cmd);
 984         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 985
 986         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 987                 prog = xstrdup(cmd);
 988
 989         while (!prog && *path)
 990                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 991
 992         return prog;
 993 }
 994
 995 static int env_compare(const void *a, const void *b)
 996 {
 997         char *const *ea = a;
 998         char *const *eb = b;
 999         return strcasecmp(*ea, *eb);
1000 }
1001
1002 struct pinfo_t {
1003         struct pinfo_t *next;
1004         pid_t pid;
1005         HANDLE proc;
1006 };
1007 static struct pinfo_t *pinfo = NULL;
1008 CRITICAL_SECTION pinfo_cs;
1009
1010 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
1011                               const char *dir,
1012                               int prepend_cmd, int fhin, int fhout, int fherr)
1013 {
1014         STARTUPINFO si;
1015         PROCESS_INFORMATION pi;
1016         struct strbuf envblk, args;
1017         unsigned flags;
1018         BOOL ret;
1019
1020         /* Determine whether or not we are associated to a console */
1021         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1022                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1023                         FILE_ATTRIBUTE_NORMAL, NULL);
1024         if (cons == INVALID_HANDLE_VALUE) {
1025                 /* There is no console associated with this process.
1026                  * Since the child is a console process, Windows
1027                  * would normally create a console window. But
1028                  * since we'll be redirecting std streams, we do
1029                  * not need the console.
1030                  * It is necessary to use DETACHED_PROCESS
1031                  * instead of CREATE_NO_WINDOW to make ssh
1032                  * recognize that it has no console.
1033                  */
1034                 flags = DETACHED_PROCESS;
1035         } else {
1036                 /* There is already a console. If we specified
1037                  * DETACHED_PROCESS here, too, Windows would
1038                  * disassociate the child from the console.
1039                  * The same is true for CREATE_NO_WINDOW.
1040                  * Go figure!
1041                  */
1042                 flags = 0;
1043                 CloseHandle(cons);
1044         }
1045         memset(&si, 0, sizeof(si));
1046         si.cb = sizeof(si);
1047         si.dwFlags = STARTF_USESTDHANDLES;
1048         si.hStdInput = winansi_get_osfhandle(fhin);
1049         si.hStdOutput = winansi_get_osfhandle(fhout);
1050         si.hStdError = winansi_get_osfhandle(fherr);
1051
1052         /* concatenate argv, quoting args as we go */
1053         strbuf_init(&args, 0);
1054         if (prepend_cmd) {
1055                 char *quoted = (char *)quote_arg(cmd);
1056                 strbuf_addstr(&args, quoted);
1057                 if (quoted != cmd)
1058                         free(quoted);
1059         }
1060         for (; *argv; argv++) {
1061                 char *quoted = (char *)quote_arg(*argv);
1062                 if (*args.buf)
1063                         strbuf_addch(&args, ' ');
1064                 strbuf_addstr(&args, quoted);
1065                 if (quoted != *argv)
1066                         free(quoted);
1067         }
1068
1069         if (env) {
1070                 int count = 0;
1071                 char **e, **sorted_env;
1072
1073                 for (e = env; *e; e++)
1074                         count++;
1075
1076                 /* environment must be sorted */
1077                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
1078                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
1079                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
1080
1081                 strbuf_init(&envblk, 0);
1082                 for (e = sorted_env; *e; e++) {
1083                         strbuf_addstr(&envblk, *e);
1084                         strbuf_addch(&envblk, '\0');
1085                 }
1086                 free(sorted_env);
1087         }
1088
1089         memset(&pi, 0, sizeof(pi));
1090         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
1091                 env ? envblk.buf : NULL, dir, &si, &pi);
1092
1093         if (env)
1094                 strbuf_release(&envblk);
1095         strbuf_release(&args);
1096
1097         if (!ret) {
1098                 errno = ENOENT;
1099                 return -1;
1100         }
1101         CloseHandle(pi.hThread);
1102
1103         /*
1104          * The process ID is the human-readable identifier of the process
1105          * that we want to present in log and error messages. The handle
1106          * is not useful for this purpose. But we cannot close it, either,
1107          * because it is not possible to turn a process ID into a process
1108          * handle after the process terminated.
1109          * Keep the handle in a list for waitpid.
1110          */
1111         EnterCriticalSection(&pinfo_cs);
1112         {
1113                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1114                 info->pid = pi.dwProcessId;
1115                 info->proc = pi.hProcess;
1116                 info->next = pinfo;
1117                 pinfo = info;
1118         }
1119         LeaveCriticalSection(&pinfo_cs);
1120
1121         return (pid_t)pi.dwProcessId;
1122 }
1123
1124 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
1125                            int prepend_cmd)
1126 {
1127         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
1128 }
1129
1130 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
1131                      const char *dir,
1132                      int fhin, int fhout, int fherr)
1133 {
1134         pid_t pid;
1135         char **path = get_path_split();
1136         char *prog = path_lookup(cmd, path, 0);
1137
1138         if (!prog) {
1139                 errno = ENOENT;
1140                 pid = -1;
1141         }
1142         else {
1143                 const char *interpr = parse_interpreter(prog);
1144
1145                 if (interpr) {
1146                         const char *argv0 = argv[0];
1147                         char *iprog = path_lookup(interpr, path, 1);
1148                         argv[0] = prog;
1149                         if (!iprog) {
1150                                 errno = ENOENT;
1151                                 pid = -1;
1152                         }
1153                         else {
1154                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1155                                                        fhin, fhout, fherr);
1156                                 free(iprog);
1157                         }
1158                         argv[0] = argv0;
1159                 }
1160                 else
1161                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1162                                                fhin, fhout, fherr);
1163                 free(prog);
1164         }
1165         free_path_split(path);
1166         return pid;
1167 }
1168
1169 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1170 {
1171         const char *interpr = parse_interpreter(cmd);
1172         char **path;
1173         char *prog;
1174         int pid = 0;
1175
1176         if (!interpr)
1177                 return 0;
1178         path = get_path_split();
1179         prog = path_lookup(interpr, path, 1);
1180         if (prog) {
1181                 int argc = 0;
1182                 const char **argv2;
1183                 while (argv[argc]) argc++;
1184                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1185                 argv2[0] = (char *)cmd; /* full path to the script file */
1186                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1187                 pid = mingw_spawnve(prog, argv2, env, 1);
1188                 if (pid >= 0) {
1189                         int status;
1190                         if (waitpid(pid, &status, 0) < 0)
1191                                 status = 255;
1192                         exit(status);
1193                 }
1194                 pid = 1;        /* indicate that we tried but failed */
1195                 free(prog);
1196                 free(argv2);
1197         }
1198         free_path_split(path);
1199         return pid;
1200 }
1201
1202 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1203 {
1204         /* check if git_command is a shell script */
1205         if (!try_shell_exec(cmd, argv, (char **)env)) {
1206                 int pid, status;
1207
1208                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1209                 if (pid < 0)
1210                         return;
1211                 if (waitpid(pid, &status, 0) < 0)
1212                         status = 255;
1213                 exit(status);
1214         }
1215 }
1216
1217 int mingw_execvp(const char *cmd, char *const *argv)
1218 {
1219         char **path = get_path_split();
1220         char *prog = path_lookup(cmd, path, 0);
1221
1222         if (prog) {
1223                 mingw_execve(prog, argv, environ);
1224                 free(prog);
1225         } else
1226                 errno = ENOENT;
1227
1228         free_path_split(path);
1229         return -1;
1230 }
1231
1232 int mingw_execv(const char *cmd, char *const *argv)
1233 {
1234         mingw_execve(cmd, argv, environ);
1235         return -1;
1236 }
1237
1238 int mingw_kill(pid_t pid, int sig)
1239 {
1240         if (pid > 0 && sig == SIGTERM) {
1241                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1242
1243                 if (TerminateProcess(h, -1)) {
1244                         CloseHandle(h);
1245                         return 0;
1246                 }
1247
1248                 errno = err_win_to_posix(GetLastError());
1249                 CloseHandle(h);
1250                 return -1;
1251         }
1252
1253         errno = EINVAL;
1254         return -1;
1255 }
1256
1257 static char **copy_environ(void)
1258 {
1259         char **env;
1260         int i = 0;
1261         while (environ[i])
1262                 i++;
1263         env = xmalloc((i+1)*sizeof(*env));
1264         for (i = 0; environ[i]; i++)
1265                 env[i] = xstrdup(environ[i]);
1266         env[i] = NULL;
1267         return env;
1268 }
1269
1270 void free_environ(char **env)
1271 {
1272         int i;
1273         for (i = 0; env[i]; i++)
1274                 free(env[i]);
1275         free(env);
1276 }
1277
1278 static int lookup_env(char **env, const char *name, size_t nmln)
1279 {
1280         int i;
1281
1282         for (i = 0; env[i]; i++) {
1283                 if (0 == strncmp(env[i], name, nmln)
1284                     && '=' == env[i][nmln])
1285                         /* matches */
1286                         return i;
1287         }
1288         return -1;
1289 }
1290
1291 /*
1292  * If name contains '=', then sets the variable, otherwise it unsets it
1293  */
1294 static char **env_setenv(char **env, const char *name)
1295 {
1296         char *eq = strchrnul(name, '=');
1297         int i = lookup_env(env, name, eq-name);
1298
1299         if (i < 0) {
1300                 if (*eq) {
1301                         for (i = 0; env[i]; i++)
1302                                 ;
1303                         env = xrealloc(env, (i+2)*sizeof(*env));
1304                         env[i] = xstrdup(name);
1305                         env[i+1] = NULL;
1306                 }
1307         }
1308         else {
1309                 free(env[i]);
1310                 if (*eq)
1311                         env[i] = xstrdup(name);
1312                 else
1313                         for (; env[i]; i++)
1314                                 env[i] = env[i+1];
1315         }
1316         return env;
1317 }
1318
1319 /*
1320  * Copies global environ and adjusts variables as specified by vars.
1321  */
1322 char **make_augmented_environ(const char *const *vars)
1323 {
1324         char **env = copy_environ();
1325
1326         while (*vars)
1327                 env = env_setenv(env, *vars++);
1328         return env;
1329 }
1330
1331 /*
1332  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1333  * that service contains a numerical port, or that it is null. It
1334  * does a simple search using gethostbyname, and returns one IPv4 host
1335  * if one was found.
1336  */
1337 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1338                                    const struct addrinfo *hints,
1339                                    struct addrinfo **res)
1340 {
1341         struct hostent *h = NULL;
1342         struct addrinfo *ai;
1343         struct sockaddr_in *sin;
1344
1345         if (node) {
1346                 h = gethostbyname(node);
1347                 if (!h)
1348                         return WSAGetLastError();
1349         }
1350
1351         ai = xmalloc(sizeof(struct addrinfo));
1352         *res = ai;
1353         ai->ai_flags = 0;
1354         ai->ai_family = AF_INET;
1355         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1356         switch (ai->ai_socktype) {
1357         case SOCK_STREAM:
1358                 ai->ai_protocol = IPPROTO_TCP;
1359                 break;
1360         case SOCK_DGRAM:
1361                 ai->ai_protocol = IPPROTO_UDP;
1362                 break;
1363         default:
1364                 ai->ai_protocol = 0;
1365                 break;
1366         }
1367         ai->ai_addrlen = sizeof(struct sockaddr_in);
1368         if (hints && (hints->ai_flags & AI_CANONNAME))
1369                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1370         else
1371                 ai->ai_canonname = NULL;
1372
1373         sin = xmalloc(ai->ai_addrlen);
1374         memset(sin, 0, ai->ai_addrlen);
1375         sin->sin_family = AF_INET;
1376         /* Note: getaddrinfo is supposed to allow service to be a string,
1377          * which should be looked up using getservbyname. This is
1378          * currently not implemented */
1379         if (service)
1380                 sin->sin_port = htons(atoi(service));
1381         if (h)
1382                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1383         else if (hints && (hints->ai_flags & AI_PASSIVE))
1384                 sin->sin_addr.s_addr = INADDR_ANY;
1385         else
1386                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1387         ai->ai_addr = (struct sockaddr *)sin;
1388         ai->ai_next = NULL;
1389         return 0;
1390 }
1391
1392 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1393 {
1394         free(res->ai_canonname);
1395         free(res->ai_addr);
1396         free(res);
1397 }
1398
1399 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1400                                    char *host, DWORD hostlen,
1401                                    char *serv, DWORD servlen, int flags)
1402 {
1403         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1404         if (sa->sa_family != AF_INET)
1405                 return EAI_FAMILY;
1406         if (!host && !serv)
1407                 return EAI_NONAME;
1408
1409         if (host && hostlen > 0) {
1410                 struct hostent *ent = NULL;
1411                 if (!(flags & NI_NUMERICHOST))
1412                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1413                                             sizeof(sin->sin_addr), AF_INET);
1414
1415                 if (ent)
1416                         snprintf(host, hostlen, "%s", ent->h_name);
1417                 else if (flags & NI_NAMEREQD)
1418                         return EAI_NONAME;
1419                 else
1420                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1421         }
1422
1423         if (serv && servlen > 0) {
1424                 struct servent *ent = NULL;
1425                 if (!(flags & NI_NUMERICSERV))
1426                         ent = getservbyport(sin->sin_port,
1427                                             flags & NI_DGRAM ? "udp" : "tcp");
1428
1429                 if (ent)
1430                         snprintf(serv, servlen, "%s", ent->s_name);
1431                 else
1432                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1433         }
1434
1435         return 0;
1436 }
1437
1438 static HMODULE ipv6_dll = NULL;
1439 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1440 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1441                                       const struct addrinfo *hints,
1442                                       struct addrinfo **res);
1443 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1444                                       char *host, DWORD hostlen,
1445                                       char *serv, DWORD servlen, int flags);
1446 /*
1447  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1448  * don't need to try to load that one dynamically.
1449  */
1450
1451 static void socket_cleanup(void)
1452 {
1453         WSACleanup();
1454         if (ipv6_dll)
1455                 FreeLibrary(ipv6_dll);
1456         ipv6_dll = NULL;
1457         ipv6_freeaddrinfo = freeaddrinfo_stub;
1458         ipv6_getaddrinfo = getaddrinfo_stub;
1459         ipv6_getnameinfo = getnameinfo_stub;
1460 }
1461
1462 static void ensure_socket_initialization(void)
1463 {
1464         WSADATA wsa;
1465         static int initialized = 0;
1466         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1467         const char **name;
1468
1469         if (initialized)
1470                 return;
1471
1472         if (WSAStartup(MAKEWORD(2,2), &wsa))
1473                 die("unable to initialize winsock subsystem, error %d",
1474                         WSAGetLastError());
1475
1476         for (name = libraries; *name; name++) {
1477                 ipv6_dll = LoadLibrary(*name);
1478                 if (!ipv6_dll)
1479                         continue;
1480
1481                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1482                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1483                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1484                                                    const struct addrinfo *,
1485                                                    struct addrinfo **))
1486                         GetProcAddress(ipv6_dll, "getaddrinfo");
1487                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1488                                                    socklen_t, char *, DWORD,
1489                                                    char *, DWORD, int))
1490                         GetProcAddress(ipv6_dll, "getnameinfo");
1491                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1492                         FreeLibrary(ipv6_dll);
1493                         ipv6_dll = NULL;
1494                 } else
1495                         break;
1496         }
1497         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1498                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1499                 ipv6_getaddrinfo = getaddrinfo_stub;
1500                 ipv6_getnameinfo = getnameinfo_stub;
1501         }
1502
1503         atexit(socket_cleanup);
1504         initialized = 1;
1505 }
1506
1507 #undef gethostname
1508 int mingw_gethostname(char *name, int namelen)
1509 {
1510     ensure_socket_initialization();
1511     return gethostname(name, namelen);
1512 }
1513
1514 #undef gethostbyname
1515 struct hostent *mingw_gethostbyname(const char *host)
1516 {
1517         ensure_socket_initialization();
1518         return gethostbyname(host);
1519 }
1520
1521 void mingw_freeaddrinfo(struct addrinfo *res)
1522 {
1523         ipv6_freeaddrinfo(res);
1524 }
1525
1526 int mingw_getaddrinfo(const char *node, const char *service,
1527                       const struct addrinfo *hints, struct addrinfo **res)
1528 {
1529         ensure_socket_initialization();
1530         return ipv6_getaddrinfo(node, service, hints, res);
1531 }
1532
1533 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1534                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1535                       int flags)
1536 {
1537         ensure_socket_initialization();
1538         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1539 }
1540
1541 int mingw_socket(int domain, int type, int protocol)
1542 {
1543         int sockfd;
1544         SOCKET s;
1545
1546         ensure_socket_initialization();
1547         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1548         if (s == INVALID_SOCKET) {
1549                 /*
1550                  * WSAGetLastError() values are regular BSD error codes
1551                  * biased by WSABASEERR.
1552                  * However, strerror() does not know about networking
1553                  * specific errors, which are values beginning at 38 or so.
1554                  * Therefore, we choose to leave the biased error code
1555                  * in errno so that _if_ someone looks up the code somewhere,
1556                  * then it is at least the number that are usually listed.
1557                  */
1558                 errno = WSAGetLastError();
1559                 return -1;
1560         }
1561         /* convert into a file descriptor */
1562         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1563                 closesocket(s);
1564                 return error("unable to make a socket file descriptor: %s",
1565                         strerror(errno));
1566         }
1567         return sockfd;
1568 }
1569
1570 #undef connect
1571 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1572 {
1573         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1574         return connect(s, sa, sz);
1575 }
1576
1577 #undef bind
1578 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1579 {
1580         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1581         return bind(s, sa, sz);
1582 }
1583
1584 #undef setsockopt
1585 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1586 {
1587         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1588         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1589 }
1590
1591 #undef shutdown
1592 int mingw_shutdown(int sockfd, int how)
1593 {
1594         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1595         return shutdown(s, how);
1596 }
1597
1598 #undef listen
1599 int mingw_listen(int sockfd, int backlog)
1600 {
1601         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1602         return listen(s, backlog);
1603 }
1604
1605 #undef accept
1606 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1607 {
1608         int sockfd2;
1609
1610         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1611         SOCKET s2 = accept(s1, sa, sz);
1612
1613         /* convert into a file descriptor */
1614         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1615                 int err = errno;
1616                 closesocket(s2);
1617                 return error("unable to make a socket file descriptor: %s",
1618                         strerror(err));
1619         }
1620         return sockfd2;
1621 }
1622
1623 #undef rename
1624 int mingw_rename(const char *pold, const char *pnew)
1625 {
1626         DWORD attrs, gle;
1627         int tries = 0;
1628         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1629         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1630                 return -1;
1631
1632         /*
1633          * Try native rename() first to get errno right.
1634          * It is based on MoveFile(), which cannot overwrite existing files.
1635          */
1636         if (!_wrename(wpold, wpnew))
1637                 return 0;
1638         if (errno != EEXIST)
1639                 return -1;
1640 repeat:
1641         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1642                 return 0;
1643         /* TODO: translate more errors */
1644         gle = GetLastError();
1645         if (gle == ERROR_ACCESS_DENIED &&
1646             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1647                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1648                         errno = EISDIR;
1649                         return -1;
1650                 }
1651                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1652                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1653                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1654                                 return 0;
1655                         gle = GetLastError();
1656                         /* revert file attributes on failure */
1657                         SetFileAttributesW(wpnew, attrs);
1658                 }
1659         }
1660         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1661                 /*
1662                  * We assume that some other process had the source or
1663                  * destination file open at the wrong moment and retry.
1664                  * In order to give the other process a higher chance to
1665                  * complete its operation, we give up our time slice now.
1666                  * If we have to retry again, we do sleep a bit.
1667                  */
1668                 Sleep(delay[tries]);
1669                 tries++;
1670                 goto repeat;
1671         }
1672         if (gle == ERROR_ACCESS_DENIED &&
1673                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1674                        "Should I try again?", pold, pnew))
1675                 goto repeat;
1676
1677         errno = EACCES;
1678         return -1;
1679 }
1680
1681 /*
1682  * Note that this doesn't return the actual pagesize, but
1683  * the allocation granularity. If future Windows specific git code
1684  * needs the real getpagesize function, we need to find another solution.
1685  */
1686 int mingw_getpagesize(void)
1687 {
1688         SYSTEM_INFO si;
1689         GetSystemInfo(&si);
1690         return si.dwAllocationGranularity;
1691 }
1692
1693 struct passwd *getpwuid(int uid)
1694 {
1695         static char user_name[100];
1696         static struct passwd p;
1697
1698         DWORD len = sizeof(user_name);
1699         if (!GetUserName(user_name, &len))
1700                 return NULL;
1701         p.pw_name = user_name;
1702         p.pw_gecos = "unknown";
1703         p.pw_dir = NULL;
1704         return &p;
1705 }
1706
1707 static HANDLE timer_event;
1708 static HANDLE timer_thread;
1709 static int timer_interval;
1710 static int one_shot;
1711 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1712
1713 /* The timer works like this:
1714  * The thread, ticktack(), is a trivial routine that most of the time
1715  * only waits to receive the signal to terminate. The main thread tells
1716  * the thread to terminate by setting the timer_event to the signalled
1717  * state.
1718  * But ticktack() interrupts the wait state after the timer's interval
1719  * length to call the signal handler.
1720  */
1721
1722 static unsigned __stdcall ticktack(void *dummy)
1723 {
1724         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1725                 mingw_raise(SIGALRM);
1726                 if (one_shot)
1727                         break;
1728         }
1729         return 0;
1730 }
1731
1732 static int start_timer_thread(void)
1733 {
1734         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1735         if (timer_event) {
1736                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1737                 if (!timer_thread )
1738                         return errno = ENOMEM,
1739                                 error("cannot start timer thread");
1740         } else
1741                 return errno = ENOMEM,
1742                         error("cannot allocate resources for timer");
1743         return 0;
1744 }
1745
1746 static void stop_timer_thread(void)
1747 {
1748         if (timer_event)
1749                 SetEvent(timer_event);  /* tell thread to terminate */
1750         if (timer_thread) {
1751                 int rc = WaitForSingleObject(timer_thread, 1000);
1752                 if (rc == WAIT_TIMEOUT)
1753                         error("timer thread did not terminate timely");
1754                 else if (rc != WAIT_OBJECT_0)
1755                         error("waiting for timer thread failed: %lu",
1756                               GetLastError());
1757                 CloseHandle(timer_thread);
1758         }
1759         if (timer_event)
1760                 CloseHandle(timer_event);
1761         timer_event = NULL;
1762         timer_thread = NULL;
1763 }
1764
1765 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1766 {
1767         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1768 }
1769
1770 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1771 {
1772         static const struct timeval zero;
1773         static int atexit_done;
1774
1775         if (out != NULL)
1776                 return errno = EINVAL,
1777                         error("setitimer param 3 != NULL not implemented");
1778         if (!is_timeval_eq(&in->it_interval, &zero) &&
1779             !is_timeval_eq(&in->it_interval, &in->it_value))
1780                 return errno = EINVAL,
1781                         error("setitimer: it_interval must be zero or eq it_value");
1782
1783         if (timer_thread)
1784                 stop_timer_thread();
1785
1786         if (is_timeval_eq(&in->it_value, &zero) &&
1787             is_timeval_eq(&in->it_interval, &zero))
1788                 return 0;
1789
1790         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1791         one_shot = is_timeval_eq(&in->it_interval, &zero);
1792         if (!atexit_done) {
1793                 atexit(stop_timer_thread);
1794                 atexit_done = 1;
1795         }
1796         return start_timer_thread();
1797 }
1798
1799 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1800 {
1801         if (sig != SIGALRM)
1802                 return errno = EINVAL,
1803                         error("sigaction only implemented for SIGALRM");
1804         if (out != NULL)
1805                 return errno = EINVAL,
1806                         error("sigaction: param 3 != NULL not implemented");
1807
1808         timer_fn = in->sa_handler;
1809         return 0;
1810 }
1811
1812 #undef signal
1813 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1814 {
1815         sig_handler_t old;
1816
1817         switch (sig) {
1818         case SIGALRM:
1819                 old = timer_fn;
1820                 timer_fn = handler;
1821                 break;
1822
1823         case SIGINT:
1824                 old = sigint_fn;
1825                 sigint_fn = handler;
1826                 break;
1827
1828         default:
1829                 return signal(sig, handler);
1830         }
1831
1832         return old;
1833 }
1834
1835 #undef raise
1836 int mingw_raise(int sig)
1837 {
1838         switch (sig) {
1839         case SIGALRM:
1840                 if (timer_fn == SIG_DFL) {
1841                         if (isatty(STDERR_FILENO))
1842                                 fputs("Alarm clock\n", stderr);
1843                         exit(128 + SIGALRM);
1844                 } else if (timer_fn != SIG_IGN)
1845                         timer_fn(SIGALRM);
1846                 return 0;
1847
1848         case SIGINT:
1849                 if (sigint_fn == SIG_DFL)
1850                         exit(128 + SIGINT);
1851                 else if (sigint_fn != SIG_IGN)
1852                         sigint_fn(SIGINT);
1853                 return 0;
1854
1855         default:
1856                 return raise(sig);
1857         }
1858 }
1859
1860
1861 static const char *make_backslash_path(const char *path)
1862 {
1863         static char buf[PATH_MAX + 1];
1864         char *c;
1865
1866         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1867                 die("Too long path: %.*s", 60, path);
1868
1869         for (c = buf; *c; c++) {
1870                 if (*c == '/')
1871                         *c = '\\';
1872         }
1873         return buf;
1874 }
1875
1876 void mingw_open_html(const char *unixpath)
1877 {
1878         const char *htmlpath = make_backslash_path(unixpath);
1879         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1880                         const char *, const char *, const char *, INT);
1881         T ShellExecute;
1882         HMODULE shell32;
1883         int r;
1884
1885         shell32 = LoadLibrary("shell32.dll");
1886         if (!shell32)
1887                 die("cannot load shell32.dll");
1888         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1889         if (!ShellExecute)
1890                 die("cannot run browser");
1891
1892         printf("Launching default browser to display HTML ...\n");
1893         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1894         FreeLibrary(shell32);
1895         /* see the MSDN documentation referring to the result codes here */
1896         if (r <= 32) {
1897                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1898         }
1899 }
1900
1901 int link(const char *oldpath, const char *newpath)
1902 {
1903         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1904         static T create_hard_link = NULL;
1905         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1906         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1907                 xutftowcs_path(wnewpath, newpath) < 0)
1908                 return -1;
1909
1910         if (!create_hard_link) {
1911                 create_hard_link = (T) GetProcAddress(
1912                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1913                 if (!create_hard_link)
1914                         create_hard_link = (T)-1;
1915         }
1916         if (create_hard_link == (T)-1) {
1917                 errno = ENOSYS;
1918                 return -1;
1919         }
1920         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1921                 errno = err_win_to_posix(GetLastError());
1922                 return -1;
1923         }
1924         return 0;
1925 }
1926
1927 pid_t waitpid(pid_t pid, int *status, int options)
1928 {
1929         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1930             FALSE, pid);
1931         if (!h) {
1932                 errno = ECHILD;
1933                 return -1;
1934         }
1935
1936         if (pid > 0 && options & WNOHANG) {
1937                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1938                         CloseHandle(h);
1939                         return 0;
1940                 }
1941                 options &= ~WNOHANG;
1942         }
1943
1944         if (options == 0) {
1945                 struct pinfo_t **ppinfo;
1946                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1947                         CloseHandle(h);
1948                         return 0;
1949                 }
1950
1951                 if (status)
1952                         GetExitCodeProcess(h, (LPDWORD)status);
1953
1954                 EnterCriticalSection(&pinfo_cs);
1955
1956                 ppinfo = &pinfo;
1957                 while (*ppinfo) {
1958                         struct pinfo_t *info = *ppinfo;
1959                         if (info->pid == pid) {
1960                                 CloseHandle(info->proc);
1961                                 *ppinfo = info->next;
1962                                 free(info);
1963                                 break;
1964                         }
1965                         ppinfo = &info->next;
1966                 }
1967
1968                 LeaveCriticalSection(&pinfo_cs);
1969
1970                 CloseHandle(h);
1971                 return pid;
1972         }
1973         CloseHandle(h);
1974
1975         errno = EINVAL;
1976         return -1;
1977 }
1978
1979 const char *get_windows_home_directory(void)
1980 {
1981         static const char *home_directory = NULL;
1982         struct strbuf buf = STRBUF_INIT;
1983
1984         if (home_directory)
1985                 return home_directory;
1986
1987         home_directory = getenv("HOME");
1988         if (home_directory && *home_directory)
1989                 return home_directory;
1990
1991         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1992         home_directory = strbuf_detach(&buf, NULL);
1993
1994         return home_directory;
1995 }
1996
1997 int mingw_offset_1st_component(const char *path)
1998 {
1999         int offset = 0;
2000         if (has_dos_drive_prefix(path))
2001                 offset = 2;
2002
2003         /* unc paths */
2004         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
2005
2006                 /* skip server name */
2007                 char *pos = strpbrk(path + 2, "\\/");
2008                 if (!pos)
2009                         return 0; /* Error: malformed unc path */
2010
2011                 do {
2012                         pos++;
2013                 } while (*pos && !is_dir_sep(*pos));
2014
2015                 offset = pos - path;
2016         }
2017
2018         return offset + is_dir_sep(path[offset]);
2019 }
2020
2021 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2022 {
2023         int upos = 0, wpos = 0;
2024         const unsigned char *utf = (const unsigned char*) utfs;
2025         if (!utf || !wcs || wcslen < 1) {
2026                 errno = EINVAL;
2027                 return -1;
2028         }
2029         /* reserve space for \0 */
2030         wcslen--;
2031         if (utflen < 0)
2032                 utflen = INT_MAX;
2033
2034         while (upos < utflen) {
2035                 int c = utf[upos++] & 0xff;
2036                 if (utflen == INT_MAX && c == 0)
2037                         break;
2038
2039                 if (wpos >= wcslen) {
2040                         wcs[wpos] = 0;
2041                         errno = ERANGE;
2042                         return -1;
2043                 }
2044
2045                 if (c < 0x80) {
2046                         /* ASCII */
2047                         wcs[wpos++] = c;
2048                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2049                                 (utf[upos] & 0xc0) == 0x80) {
2050                         /* 2-byte utf-8 */
2051                         c = ((c & 0x1f) << 6);
2052                         c |= (utf[upos++] & 0x3f);
2053                         wcs[wpos++] = c;
2054                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2055                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2056                                 (utf[upos] & 0xc0) == 0x80 &&
2057                                 (utf[upos + 1] & 0xc0) == 0x80) {
2058                         /* 3-byte utf-8 */
2059                         c = ((c & 0x0f) << 12);
2060                         c |= ((utf[upos++] & 0x3f) << 6);
2061                         c |= (utf[upos++] & 0x3f);
2062                         wcs[wpos++] = c;
2063                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2064                                 wpos + 1 < wcslen &&
2065                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2066                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2067                                 (utf[upos] & 0xc0) == 0x80 &&
2068                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2069                                 (utf[upos + 2] & 0xc0) == 0x80) {
2070                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2071                         c = ((c & 0x07) << 18);
2072                         c |= ((utf[upos++] & 0x3f) << 12);
2073                         c |= ((utf[upos++] & 0x3f) << 6);
2074                         c |= (utf[upos++] & 0x3f);
2075                         c -= 0x10000;
2076                         wcs[wpos++] = 0xd800 | (c >> 10);
2077                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2078                 } else if (c >= 0xa0) {
2079                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2080                         wcs[wpos++] = c;
2081                 } else {
2082                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2083                         static const char *hex = "0123456789abcdef";
2084                         wcs[wpos++] = hex[c >> 4];
2085                         if (wpos < wcslen)
2086                                 wcs[wpos++] = hex[c & 0x0f];
2087                 }
2088         }
2089         wcs[wpos] = 0;
2090         return wpos;
2091 }
2092
2093 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2094 {
2095         if (!wcs || !utf || utflen < 1) {
2096                 errno = EINVAL;
2097                 return -1;
2098         }
2099         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2100         if (utflen)
2101                 return utflen - 1;
2102         errno = ERANGE;
2103         return -1;
2104 }
2105
2106 /*
2107  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2108  * mingw startup code, see init.c in mingw runtime).
2109  */
2110 int _CRT_glob = 0;
2111
2112 void mingw_startup()
2113 {
2114         /* copy executable name to argv[0] */
2115         __argv[0] = xstrdup(_pgmptr);
2116
2117         /* initialize critical section for waitpid pinfo_t list */
2118         InitializeCriticalSection(&pinfo_cs);
2119
2120         /* set up default file mode and file modes for stdin/out/err */
2121         _fmode = _O_BINARY;
2122         _setmode(_fileno(stdin), _O_BINARY);
2123         _setmode(_fileno(stdout), _O_BINARY);
2124         _setmode(_fileno(stderr), _O_BINARY);
2125
2126         /* initialize Unicode console */
2127         winansi_init();
2128 }