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] = mingw_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_LONG_PATH];
 208         if (xutftowcs_long_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_LONG_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_LONG_PATH];
 259         if (xutftowcs_long_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_LONG_PATH];
 300         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository())
 301                 if (xutftowcs_long_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_LONG_PATH];
 313         /* CreateDirectoryW path limit is 248 (MAX_PATH - 8.3 file name) */
 314         if (xutftowcs_path_ex(wpath, path, MAX_LONG_PATH, -1, 248,
 315                         core_long_paths) < 0)
 316                 return -1;
 317
 318         ret = _wmkdir(wpath);
 319         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 320                 /*
 321                  * In Windows a file or dir starting with a dot is not
 322                  * automatically hidden. So lets mark it as hidden when
 323                  * such a directory is created.
 324                  */
 325                 const char *start = basename((char*)path);
 326                 if (*start == '.')
 327                         return make_hidden(wpath);
 328         }
 329         return ret;
 330 }
 331
 332 int mingw_open (const char *filename, int oflags, ...)
 333 {
 334         va_list args;
 335         unsigned mode;
 336         int fd;
 337         wchar_t wfilename[MAX_LONG_PATH];
 338
 339         va_start(args, oflags);
 340         mode = va_arg(args, int);
 341         va_end(args);
 342
 343         if (filename && !strcmp(filename, "/dev/null"))
 344                 filename = "nul";
 345
 346         if (xutftowcs_long_path(wfilename, filename) < 0)
 347                 return -1;
 348         fd = _wopen(wfilename, oflags, mode);
 349
 350         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 351                 DWORD attrs = GetFileAttributesW(wfilename);
 352                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 353                         errno = EISDIR;
 354         }
 355         if ((oflags & O_CREAT) && fd >= 0 &&
 356             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 357                 /*
 358                  * In Windows a file or dir starting with a dot is not
 359                  * automatically hidden. So lets mark it as hidden when
 360                  * such a file is created.
 361                  */
 362                 const char *start = basename((char*)filename);
 363                 if (*start == '.' && make_hidden(wfilename))
 364                         warning("Could not mark '%s' as hidden.", filename);
 365         }
 366         return fd;
 367 }
 368
 369 static BOOL WINAPI ctrl_ignore(DWORD type)
 370 {
 371         return TRUE;
 372 }
 373
 374 #undef fgetc
 375 int mingw_fgetc(FILE *stream)
 376 {
 377         int ch;
 378         if (!isatty(_fileno(stream)))
 379                 return fgetc(stream);
 380
 381         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 382         while (1) {
 383                 ch = fgetc(stream);
 384                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 385                         break;
 386
 387                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 388                 mingw_raise(SIGINT);
 389         }
 390         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 391         return ch;
 392 }
 393
 394 #undef fopen
 395 FILE *mingw_fopen (const char *filename, const char *otype)
 396 {
 397         int hide = 0;
 398         FILE *file;
 399         wchar_t wfilename[MAX_LONG_PATH], wotype[4];
 400         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 401             basename((char*)filename)[0] == '.')
 402                 hide = access(filename, F_OK);
 403         if (filename && !strcmp(filename, "/dev/null"))
 404                 filename = "nul";
 405         if (xutftowcs_long_path(wfilename, filename) < 0 ||
 406                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 407                 return NULL;
 408         file = _wfopen(wfilename, wotype);
 409         if (file && hide && make_hidden(wfilename))
 410                 warning("Could not mark '%s' as hidden.", filename);
 411         return file;
 412 }
 413
 414 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 415 {
 416         int hide = 0;
 417         FILE *file;
 418         wchar_t wfilename[MAX_LONG_PATH], wotype[4];
 419         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 420             basename((char*)filename)[0] == '.')
 421                 hide = access(filename, F_OK);
 422         if (filename && !strcmp(filename, "/dev/null"))
 423                 filename = "nul";
 424         if (xutftowcs_long_path(wfilename, filename) < 0 ||
 425                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 426                 return NULL;
 427         file = _wfreopen(wfilename, wotype, stream);
 428         if (file && hide && make_hidden(wfilename))
 429                 warning("Could not mark '%s' as hidden.", filename);
 430         return file;
 431 }
 432
 433 #undef fflush
 434 int mingw_fflush(FILE *stream)
 435 {
 436         int ret = fflush(stream);
 437
 438         /*
 439          * write() is used behind the scenes of stdio output functions.
 440          * Since git code does not check for errors after each stdio write
 441          * operation, it can happen that write() is called by a later
 442          * stdio function even if an earlier write() call failed. In the
 443          * case of a pipe whose readable end was closed, only the first
 444          * call to write() reports EPIPE on Windows. Subsequent write()
 445          * calls report EINVAL. It is impossible to notice whether this
 446          * fflush invocation triggered such a case, therefore, we have to
 447          * catch all EINVAL errors whole-sale.
 448          */
 449         if (ret && errno == EINVAL)
 450                 errno = EPIPE;
 451
 452         return ret;
 453 }
 454
 455 int mingw_access(const char *filename, int mode)
 456 {
 457         wchar_t wfilename[MAX_LONG_PATH];
 458         if (xutftowcs_long_path(wfilename, filename) < 0)
 459                 return -1;
 460         /* X_OK is not supported by the MSVCRT version */
 461         return _waccess(wfilename, mode & ~X_OK);
 462 }
 463
 464 /* cached length of current directory for handle_long_path */
 465 static int current_directory_len = 0;
 466
 467 int mingw_chdir(const char *dirname)
 468 {
 469         int result;
 470         wchar_t wdirname[MAX_PATH];
 471         /* SetCurrentDirectoryW doesn't support long paths */
 472         if (xutftowcs_path(wdirname, dirname) < 0)
 473                 return -1;
 474         result = _wchdir(wdirname);
 475         current_directory_len = GetCurrentDirectoryW(0, NULL);
 476         return result;
 477 }
 478
 479 int mingw_chmod(const char *filename, int mode)
 480 {
 481         wchar_t wfilename[MAX_LONG_PATH];
 482         if (xutftowcs_long_path(wfilename, filename) < 0)
 483                 return -1;
 484         return _wchmod(wfilename, mode);
 485 }
 486
 487 /* We keep the do_lstat code in a separate function to avoid recursion.
 488  * When a path ends with a slash, the stat will fail with ENOENT. In
 489  * this case, we strip the trailing slashes and stat again.
 490  *
 491  * If follow is true then act like stat() and report on the link
 492  * target. Otherwise report on the link itself.
 493  */
 494 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 495 {
 496         WIN32_FILE_ATTRIBUTE_DATA fdata;
 497         wchar_t wfilename[MAX_LONG_PATH];
 498         if (xutftowcs_long_path(wfilename, file_name) < 0)
 499                 return -1;
 500
 501         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 502                 buf->st_ino = 0;
 503                 buf->st_gid = 0;
 504                 buf->st_uid = 0;
 505                 buf->st_nlink = 1;
 506                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 507                 buf->st_size = fdata.nFileSizeLow |
 508                         (((off_t)fdata.nFileSizeHigh)<<32);
 509                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 510                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 511                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 512                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 513                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 514                         WIN32_FIND_DATAW findbuf;
 515                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 516                         if (handle != INVALID_HANDLE_VALUE) {
 517                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 518                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 519                                         if (follow) {
 520                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 521                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 522                                         } else {
 523                                                 buf->st_mode = S_IFLNK;
 524                                         }
 525                                         buf->st_mode |= S_IREAD;
 526                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 527                                                 buf->st_mode |= S_IWRITE;
 528                                 }
 529                                 FindClose(handle);
 530                         }
 531                 }
 532                 return 0;
 533         }
 534         switch (GetLastError()) {
 535         case ERROR_ACCESS_DENIED:
 536         case ERROR_SHARING_VIOLATION:
 537         case ERROR_LOCK_VIOLATION:
 538         case ERROR_SHARING_BUFFER_EXCEEDED:
 539                 errno = EACCES;
 540                 break;
 541         case ERROR_BUFFER_OVERFLOW:
 542                 errno = ENAMETOOLONG;
 543                 break;
 544         case ERROR_NOT_ENOUGH_MEMORY:
 545                 errno = ENOMEM;
 546                 break;
 547         default:
 548                 errno = ENOENT;
 549                 break;
 550         }
 551         return -1;
 552 }
 553
 554 /* We provide our own lstat/fstat functions, since the provided
 555  * lstat/fstat functions are so slow. These stat functions are
 556  * tailored for Git's usage (read: fast), and are not meant to be
 557  * complete. Note that Git stat()s are redirected to mingw_lstat()
 558  * too, since Windows doesn't really handle symlinks that well.
 559  */
 560 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 561 {
 562         int namelen;
 563         char alt_name[MAX_LONG_PATH];
 564
 565         if (!do_lstat(follow, file_name, buf))
 566                 return 0;
 567
 568         /* if file_name ended in a '/', Windows returned ENOENT;
 569          * try again without trailing slashes
 570          */
 571         if (errno != ENOENT)
 572                 return -1;
 573
 574         namelen = strlen(file_name);
 575         if (namelen && file_name[namelen-1] != '/')
 576                 return -1;
 577         while (namelen && file_name[namelen-1] == '/')
 578                 --namelen;
 579         if (!namelen || namelen >= MAX_LONG_PATH)
 580                 return -1;
 581
 582         memcpy(alt_name, file_name, namelen);
 583         alt_name[namelen] = 0;
 584         return do_lstat(follow, alt_name, buf);
 585 }
 586
 587 int (*lstat)(const char *file_name, struct stat *buf) = mingw_lstat;
 588
 589 int mingw_lstat(const char *file_name, struct stat *buf)
 590 {
 591         return do_stat_internal(0, file_name, buf);
 592 }
 593 int mingw_stat(const char *file_name, struct stat *buf)
 594 {
 595         return do_stat_internal(1, file_name, buf);
 596 }
 597
 598 int mingw_fstat(int fd, struct stat *buf)
 599 {
 600         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 601         BY_HANDLE_FILE_INFORMATION fdata;
 602
 603         if (fh == INVALID_HANDLE_VALUE) {
 604                 errno = EBADF;
 605                 return -1;
 606         }
 607         /* direct non-file handles to MS's fstat() */
 608         if (GetFileType(fh) != FILE_TYPE_DISK)
 609                 return _fstati64(fd, buf);
 610
 611         if (GetFileInformationByHandle(fh, &fdata)) {
 612                 buf->st_ino = 0;
 613                 buf->st_gid = 0;
 614                 buf->st_uid = 0;
 615                 buf->st_nlink = 1;
 616                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 617                 buf->st_size = fdata.nFileSizeLow |
 618                         (((off_t)fdata.nFileSizeHigh)<<32);
 619                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 620                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 621                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 622                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 623                 return 0;
 624         }
 625         errno = EBADF;
 626         return -1;
 627 }
 628
 629 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 630 {
 631         long long winTime = t * 10000000LL + 116444736000000000LL;
 632         ft->dwLowDateTime = winTime;
 633         ft->dwHighDateTime = winTime >> 32;
 634 }
 635
 636 int mingw_utime (const char *file_name, const struct utimbuf *times)
 637 {
 638         FILETIME mft, aft;
 639         int fh, rc;
 640         DWORD attrs;
 641         wchar_t wfilename[MAX_LONG_PATH];
 642         if (xutftowcs_long_path(wfilename, file_name) < 0)
 643                 return -1;
 644
 645         /* must have write permission */
 646         attrs = GetFileAttributesW(wfilename);
 647         if (attrs != INVALID_FILE_ATTRIBUTES &&
 648             (attrs & FILE_ATTRIBUTE_READONLY)) {
 649                 /* ignore errors here; open() will report them */
 650                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 651         }
 652
 653         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 654                 rc = -1;
 655                 goto revert_attrs;
 656         }
 657
 658         if (times) {
 659                 time_t_to_filetime(times->modtime, &mft);
 660                 time_t_to_filetime(times->actime, &aft);
 661         } else {
 662                 GetSystemTimeAsFileTime(&mft);
 663                 aft = mft;
 664         }
 665         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 666                 errno = EINVAL;
 667                 rc = -1;
 668         } else
 669                 rc = 0;
 670         close(fh);
 671
 672 revert_attrs:
 673         if (attrs != INVALID_FILE_ATTRIBUTES &&
 674             (attrs & FILE_ATTRIBUTE_READONLY)) {
 675                 /* ignore errors again */
 676                 SetFileAttributesW(wfilename, attrs);
 677         }
 678         return rc;
 679 }
 680
 681 unsigned int sleep (unsigned int seconds)
 682 {
 683         Sleep(seconds*1000);
 684         return 0;
 685 }
 686
 687 char *mingw_mktemp(char *template)
 688 {
 689         wchar_t wtemplate[MAX_PATH];
 690         /* we need to return the path, thus no long paths here! */
 691         if (xutftowcs_path(wtemplate, template) < 0)
 692                 return NULL;
 693         if (!_wmktemp(wtemplate))
 694                 return NULL;
 695         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 696                 return NULL;
 697         return template;
 698 }
 699
 700 int mkstemp(char *template)
 701 {
 702         char *filename = mktemp(template);
 703         if (filename == NULL)
 704                 return -1;
 705         return open(filename, O_RDWR | O_CREAT, 0600);
 706 }
 707
 708 int gettimeofday(struct timeval *tv, void *tz)
 709 {
 710         FILETIME ft;
 711         long long hnsec;
 712
 713         GetSystemTimeAsFileTime(&ft);
 714         hnsec = filetime_to_hnsec(&ft);
 715         tv->tv_sec = hnsec / 10000000;
 716         tv->tv_usec = (hnsec % 10000000) / 10;
 717         return 0;
 718 }
 719
 720 int pipe(int filedes[2])
 721 {
 722         HANDLE h[2];
 723
 724         /* this creates non-inheritable handles */
 725         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 726                 errno = err_win_to_posix(GetLastError());
 727                 return -1;
 728         }
 729         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 730         if (filedes[0] < 0) {
 731                 CloseHandle(h[0]);
 732                 CloseHandle(h[1]);
 733                 return -1;
 734         }
 735         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 736         if (filedes[0] < 0) {
 737                 close(filedes[0]);
 738                 CloseHandle(h[1]);
 739                 return -1;
 740         }
 741         return 0;
 742 }
 743
 744 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 745 {
 746         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 747         memcpy(result, gmtime(timep), sizeof(struct tm));
 748         return result;
 749 }
 750
 751 struct tm *localtime_r(const time_t *timep, struct tm *result)
 752 {
 753         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 754         memcpy(result, localtime(timep), sizeof(struct tm));
 755         return result;
 756 }
 757
 758 char *mingw_getcwd(char *pointer, int len)
 759 {
 760         int i;
 761         wchar_t wpointer[MAX_PATH];
 762         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 763                 return NULL;
 764         if (xwcstoutf(pointer, wpointer, len) < 0)
 765                 return NULL;
 766         for (i = 0; pointer[i]; i++)
 767                 if (pointer[i] == '\\')
 768                         pointer[i] = '/';
 769         return pointer;
 770 }
 771
 772 /*
 773  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 774  * (Parsing C++ Command-Line Arguments)
 775  */
 776 static const char *quote_arg(const char *arg)
 777 {
 778         /* count chars to quote */
 779         int len = 0, n = 0;
 780         int force_quotes = 0;
 781         char *q, *d;
 782         const char *p = arg;
 783         if (!*p) force_quotes = 1;
 784         while (*p) {
 785                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 786                         force_quotes = 1;
 787                 else if (*p == '"')
 788                         n++;
 789                 else if (*p == '\\') {
 790                         int count = 0;
 791                         while (*p == '\\') {
 792                                 count++;
 793                                 p++;
 794                                 len++;
 795                         }
 796                         if (*p == '"')
 797                                 n += count*2 + 1;
 798                         continue;
 799                 }
 800                 len++;
 801                 p++;
 802         }
 803         if (!force_quotes && n == 0)
 804                 return arg;
 805
 806         /* insert \ where necessary */
 807         d = q = xmalloc(len+n+3);
 808         *d++ = '"';
 809         while (*arg) {
 810                 if (*arg == '"')
 811                         *d++ = '\\';
 812                 else if (*arg == '\\') {
 813                         int count = 0;
 814                         while (*arg == '\\') {
 815                                 count++;
 816                                 *d++ = *arg++;
 817                         }
 818                         if (*arg == '"') {
 819                                 while (count-- > 0)
 820                                         *d++ = '\\';
 821                                 *d++ = '\\';
 822                         }
 823                 }
 824                 *d++ = *arg++;
 825         }
 826         *d++ = '"';
 827         *d++ = 0;
 828         return q;
 829 }
 830
 831 static const char *parse_interpreter(const char *cmd)
 832 {
 833         static char buf[100];
 834         char *p, *opt;
 835         int n, fd;
 836
 837         /* don't even try a .exe */
 838         n = strlen(cmd);
 839         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 840                 return NULL;
 841
 842         fd = open(cmd, O_RDONLY);
 843         if (fd < 0)
 844                 return NULL;
 845         n = read(fd, buf, sizeof(buf)-1);
 846         close(fd);
 847         if (n < 4)      /* at least '#!/x' and not error */
 848                 return NULL;
 849
 850         if (buf[0] != '#' || buf[1] != '!')
 851                 return NULL;
 852         buf[n] = '\0';
 853         p = buf + strcspn(buf, "\r\n");
 854         if (!*p)
 855                 return NULL;
 856
 857         *p = '\0';
 858         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 859                 return NULL;
 860         /* strip options */
 861         if ((opt = strchr(p+1, ' ')))
 862                 *opt = '\0';
 863         return p+1;
 864 }
 865
 866 /*
 867  * Splits the PATH into parts.
 868  */
 869 static char **get_path_split(void)
 870 {
 871         char *p, **path, *envpath = mingw_getenv("PATH");
 872         int i, n = 0;
 873
 874         if (!envpath || !*envpath)
 875                 return NULL;
 876
 877         envpath = xstrdup(envpath);
 878         p = envpath;
 879         while (p) {
 880                 char *dir = p;
 881                 p = strchr(p, ';');
 882                 if (p) *p++ = '\0';
 883                 if (*dir) {     /* not earlier, catches series of ; */
 884                         ++n;
 885                 }
 886         }
 887         if (!n)
 888                 return NULL;
 889
 890         path = xmalloc((n+1)*sizeof(char *));
 891         p = envpath;
 892         i = 0;
 893         do {
 894                 if (*p)
 895                         path[i++] = xstrdup(p);
 896                 p = p+strlen(p)+1;
 897         } while (i < n);
 898         path[i] = NULL;
 899
 900         free(envpath);
 901
 902         return path;
 903 }
 904
 905 static void free_path_split(char **path)
 906 {
 907         char **p = path;
 908
 909         if (!path)
 910                 return;
 911
 912         while (*p)
 913                 free(*p++);
 914         free(path);
 915 }
 916
 917 /*
 918  * exe_only means that we only want to detect .exe files, but not scripts
 919  * (which do not have an extension)
 920  */
 921 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 922 {
 923         char path[MAX_PATH];
 924         wchar_t wpath[MAX_PATH];
 925         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 926
 927         if (xutftowcs_path(wpath, path) < 0)
 928                 return NULL;
 929
 930         if (!isexe && _waccess(wpath, F_OK) == 0)
 931                 return xstrdup(path);
 932         wpath[wcslen(wpath)-4] = '\0';
 933         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
 934                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
 935                         path[strlen(path)-4] = '\0';
 936                         return xstrdup(path);
 937                 }
 938         }
 939         return NULL;
 940 }
 941
 942 /*
 943  * Determines the absolute path of cmd using the split path in path.
 944  * If cmd contains a slash or backslash, no lookup is performed.
 945  */
 946 static char *path_lookup(const char *cmd, char **path, int exe_only)
 947 {
 948         char *prog = NULL;
 949         int len = strlen(cmd);
 950         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 951
 952         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 953                 prog = xstrdup(cmd);
 954
 955         while (!prog && *path)
 956                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 957
 958         return prog;
 959 }
 960
 961 static int do_putenv(char **env, const char *name, int size, int free_old);
 962
 963 /* used number of elements of environ array, including terminating NULL */
 964 static int environ_size = 0;
 965 /* allocated size of environ array, in bytes */
 966 static int environ_alloc = 0;
 967
 968 /*
 969  * Create environment block suitable for CreateProcess. Merges current
 970  * process environment and the supplied environment changes.
 971  */
 972 static wchar_t *make_environment_block(char **deltaenv)
 973 {
 974         wchar_t *wenvblk = NULL;
 975         char **tmpenv;
 976         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
 977
 978         while (deltaenv && deltaenv[i])
 979                 i++;
 980
 981         /* copy the environment, leaving space for changes */
 982         tmpenv = xmalloc((size + i) * sizeof(char*));
 983         memcpy(tmpenv, environ, size * sizeof(char*));
 984
 985         /* merge supplied environment changes into the temporary environment */
 986         for (i = 0; deltaenv && deltaenv[i]; i++)
 987                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
 988
 989         /* create environment block from temporary environment */
 990         for (i = 0; tmpenv[i]; i++) {
 991                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
 992                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
 993                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
 994         }
 995         /* add final \0 terminator */
 996         wenvblk[wenvpos] = 0;
 997         free(tmpenv);
 998         return wenvblk;
 999 }
1000
1001 struct pinfo_t {
1002         struct pinfo_t *next;
1003         pid_t pid;
1004         HANDLE proc;
1005 };
1006 static struct pinfo_t *pinfo = NULL;
1007 CRITICAL_SECTION pinfo_cs;
1008
1009 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1010                               const char *dir,
1011                               int prepend_cmd, int fhin, int fhout, int fherr)
1012 {
1013         STARTUPINFOW si;
1014         PROCESS_INFORMATION pi;
1015         struct strbuf args;
1016         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1017         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
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                 CloseHandle(cons);
1043         }
1044         memset(&si, 0, sizeof(si));
1045         si.cb = sizeof(si);
1046         si.dwFlags = STARTF_USESTDHANDLES;
1047         si.hStdInput = winansi_get_osfhandle(fhin);
1048         si.hStdOutput = winansi_get_osfhandle(fhout);
1049         si.hStdError = winansi_get_osfhandle(fherr);
1050
1051         /* executables and the current directory don't support long paths */
1052         if (xutftowcs_path(wcmd, cmd) < 0)
1053                 return -1;
1054         if (dir && xutftowcs_path(wdir, dir) < 0)
1055                 return -1;
1056
1057         /* concatenate argv, quoting args as we go */
1058         strbuf_init(&args, 0);
1059         if (prepend_cmd) {
1060                 char *quoted = (char *)quote_arg(cmd);
1061                 strbuf_addstr(&args, quoted);
1062                 if (quoted != cmd)
1063                         free(quoted);
1064         }
1065         for (; *argv; argv++) {
1066                 char *quoted = (char *)quote_arg(*argv);
1067                 if (*args.buf)
1068                         strbuf_addch(&args, ' ');
1069                 strbuf_addstr(&args, quoted);
1070                 if (quoted != *argv)
1071                         free(quoted);
1072         }
1073
1074         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1075         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1076         strbuf_release(&args);
1077
1078         wenvblk = make_environment_block(deltaenv);
1079
1080         memset(&pi, 0, sizeof(pi));
1081         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1082                 wenvblk, dir ? wdir : NULL, &si, &pi);
1083
1084         free(wenvblk);
1085         free(wargs);
1086
1087         if (!ret) {
1088                 errno = ENOENT;
1089                 return -1;
1090         }
1091         CloseHandle(pi.hThread);
1092
1093         /*
1094          * The process ID is the human-readable identifier of the process
1095          * that we want to present in log and error messages. The handle
1096          * is not useful for this purpose. But we cannot close it, either,
1097          * because it is not possible to turn a process ID into a process
1098          * handle after the process terminated.
1099          * Keep the handle in a list for waitpid.
1100          */
1101         EnterCriticalSection(&pinfo_cs);
1102         {
1103                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1104                 info->pid = pi.dwProcessId;
1105                 info->proc = pi.hProcess;
1106                 info->next = pinfo;
1107                 pinfo = info;
1108         }
1109         LeaveCriticalSection(&pinfo_cs);
1110
1111         return (pid_t)pi.dwProcessId;
1112 }
1113
1114 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1115 {
1116         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1117 }
1118
1119 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1120                      const char *dir,
1121                      int fhin, int fhout, int fherr)
1122 {
1123         pid_t pid;
1124         char **path = get_path_split();
1125         char *prog = path_lookup(cmd, path, 0);
1126
1127         if (!prog) {
1128                 errno = ENOENT;
1129                 pid = -1;
1130         }
1131         else {
1132                 const char *interpr = parse_interpreter(prog);
1133
1134                 if (interpr) {
1135                         const char *argv0 = argv[0];
1136                         char *iprog = path_lookup(interpr, path, 1);
1137                         argv[0] = prog;
1138                         if (!iprog) {
1139                                 errno = ENOENT;
1140                                 pid = -1;
1141                         }
1142                         else {
1143                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1144                                                        fhin, fhout, fherr);
1145                                 free(iprog);
1146                         }
1147                         argv[0] = argv0;
1148                 }
1149                 else
1150                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1151                                                fhin, fhout, fherr);
1152                 free(prog);
1153         }
1154         free_path_split(path);
1155         return pid;
1156 }
1157
1158 static int try_shell_exec(const char *cmd, char *const *argv)
1159 {
1160         const char *interpr = parse_interpreter(cmd);
1161         char **path;
1162         char *prog;
1163         int pid = 0;
1164
1165         if (!interpr)
1166                 return 0;
1167         path = get_path_split();
1168         prog = path_lookup(interpr, path, 1);
1169         if (prog) {
1170                 int argc = 0;
1171                 const char **argv2;
1172                 while (argv[argc]) argc++;
1173                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1174                 argv2[0] = (char *)cmd; /* full path to the script file */
1175                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1176                 pid = mingw_spawnv(prog, argv2, 1);
1177                 if (pid >= 0) {
1178                         int status;
1179                         if (waitpid(pid, &status, 0) < 0)
1180                                 status = 255;
1181                         exit(status);
1182                 }
1183                 pid = 1;        /* indicate that we tried but failed */
1184                 free(prog);
1185                 free(argv2);
1186         }
1187         free_path_split(path);
1188         return pid;
1189 }
1190
1191 int mingw_execv(const char *cmd, char *const *argv)
1192 {
1193         /* check if git_command is a shell script */
1194         if (!try_shell_exec(cmd, argv)) {
1195                 int pid, status;
1196
1197                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1198                 if (pid < 0)
1199                         return -1;
1200                 if (waitpid(pid, &status, 0) < 0)
1201                         status = 255;
1202                 exit(status);
1203         }
1204         return -1;
1205 }
1206
1207 int mingw_execvp(const char *cmd, char *const *argv)
1208 {
1209         char **path = get_path_split();
1210         char *prog = path_lookup(cmd, path, 0);
1211
1212         if (prog) {
1213                 mingw_execv(prog, argv);
1214                 free(prog);
1215         } else
1216                 errno = ENOENT;
1217
1218         free_path_split(path);
1219         return -1;
1220 }
1221
1222 int mingw_kill(pid_t pid, int sig)
1223 {
1224         if (pid > 0 && sig == SIGTERM) {
1225                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1226
1227                 if (TerminateProcess(h, -1)) {
1228                         CloseHandle(h);
1229                         return 0;
1230                 }
1231
1232                 errno = err_win_to_posix(GetLastError());
1233                 CloseHandle(h);
1234                 return -1;
1235         } else if (pid > 0 && sig == 0) {
1236                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1237                 if (h) {
1238                         CloseHandle(h);
1239                         return 0;
1240                 }
1241         }
1242
1243         errno = EINVAL;
1244         return -1;
1245 }
1246
1247 /*
1248  * Compare environment entries by key (i.e. stopping at '=' or '\0').
1249  */
1250 static int compareenv(const void *v1, const void *v2)
1251 {
1252         const char *e1 = *(const char**)v1;
1253         const char *e2 = *(const char**)v2;
1254
1255         for (;;) {
1256                 int c1 = *e1++;
1257                 int c2 = *e2++;
1258                 c1 = (c1 == '=') ? 0 : tolower(c1);
1259                 c2 = (c2 == '=') ? 0 : tolower(c2);
1260                 if (c1 > c2)
1261                         return 1;
1262                 if (c1 < c2)
1263                         return -1;
1264                 if (c1 == 0)
1265                         return 0;
1266         }
1267 }
1268
1269 static int bsearchenv(char **env, const char *name, size_t size)
1270 {
1271         unsigned low = 0, high = size;
1272         while (low < high) {
1273                 unsigned mid = low + ((high - low) >> 1);
1274                 int cmp = compareenv(&env[mid], &name);
1275                 if (cmp < 0)
1276                         low = mid + 1;
1277                 else if (cmp > 0)
1278                         high = mid;
1279                 else
1280                         return mid;
1281         }
1282         return ~low; /* not found, return 1's complement of insert position */
1283 }
1284
1285 /*
1286  * If name contains '=', then sets the variable, otherwise it unsets it
1287  * Size includes the terminating NULL. Env must have room for size + 1 entries
1288  * (in case of insert). Returns the new size. Optionally frees removed entries.
1289  */
1290 static int do_putenv(char **env, const char *name, int size, int free_old)
1291 {
1292         int i = bsearchenv(env, name, size - 1);
1293
1294         /* optionally free removed / replaced entry */
1295         if (i >= 0 && free_old)
1296                 free(env[i]);
1297
1298         if (strchr(name, '=')) {
1299                 /* if new value ('key=value') is specified, insert or replace entry */
1300                 if (i < 0) {
1301                         i = ~i;
1302                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1303                         size++;
1304                 }
1305                 env[i] = (char*) name;
1306         } else if (i >= 0) {
1307                 /* otherwise ('key') remove existing entry */
1308                 size--;
1309                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1310         }
1311         return size;
1312 }
1313
1314 char *mingw_getenv(const char *name)
1315 {
1316         char *value;
1317         int pos = bsearchenv(environ, name, environ_size - 1);
1318         if (pos < 0)
1319                 return NULL;
1320         value = strchr(environ[pos], '=');
1321         return value ? &value[1] : NULL;
1322 }
1323
1324 int mingw_putenv(const char *namevalue)
1325 {
1326         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1327         environ_size = do_putenv(environ, namevalue, environ_size, 1);
1328         return 0;
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 = xcalloc(1, ai->ai_addrlen);
1374         sin->sin_family = AF_INET;
1375         /* Note: getaddrinfo is supposed to allow service to be a string,
1376          * which should be looked up using getservbyname. This is
1377          * currently not implemented */
1378         if (service)
1379                 sin->sin_port = htons(atoi(service));
1380         if (h)
1381                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1382         else if (hints && (hints->ai_flags & AI_PASSIVE))
1383                 sin->sin_addr.s_addr = INADDR_ANY;
1384         else
1385                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1386         ai->ai_addr = (struct sockaddr *)sin;
1387         ai->ai_next = NULL;
1388         return 0;
1389 }
1390
1391 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1392 {
1393         free(res->ai_canonname);
1394         free(res->ai_addr);
1395         free(res);
1396 }
1397
1398 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1399                                    char *host, DWORD hostlen,
1400                                    char *serv, DWORD servlen, int flags)
1401 {
1402         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1403         if (sa->sa_family != AF_INET)
1404                 return EAI_FAMILY;
1405         if (!host && !serv)
1406                 return EAI_NONAME;
1407
1408         if (host && hostlen > 0) {
1409                 struct hostent *ent = NULL;
1410                 if (!(flags & NI_NUMERICHOST))
1411                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1412                                             sizeof(sin->sin_addr), AF_INET);
1413
1414                 if (ent)
1415                         snprintf(host, hostlen, "%s", ent->h_name);
1416                 else if (flags & NI_NAMEREQD)
1417                         return EAI_NONAME;
1418                 else
1419                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1420         }
1421
1422         if (serv && servlen > 0) {
1423                 struct servent *ent = NULL;
1424                 if (!(flags & NI_NUMERICSERV))
1425                         ent = getservbyport(sin->sin_port,
1426                                             flags & NI_DGRAM ? "udp" : "tcp");
1427
1428                 if (ent)
1429                         snprintf(serv, servlen, "%s", ent->s_name);
1430                 else
1431                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1432         }
1433
1434         return 0;
1435 }
1436
1437 static HMODULE ipv6_dll = NULL;
1438 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1439 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1440                                       const struct addrinfo *hints,
1441                                       struct addrinfo **res);
1442 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1443                                       char *host, DWORD hostlen,
1444                                       char *serv, DWORD servlen, int flags);
1445 /*
1446  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1447  * don't need to try to load that one dynamically.
1448  */
1449
1450 static void socket_cleanup(void)
1451 {
1452         WSACleanup();
1453         if (ipv6_dll)
1454                 FreeLibrary(ipv6_dll);
1455         ipv6_dll = NULL;
1456         ipv6_freeaddrinfo = freeaddrinfo_stub;
1457         ipv6_getaddrinfo = getaddrinfo_stub;
1458         ipv6_getnameinfo = getnameinfo_stub;
1459 }
1460
1461 static void ensure_socket_initialization(void)
1462 {
1463         WSADATA wsa;
1464         static int initialized = 0;
1465         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1466         const char **name;
1467
1468         if (initialized)
1469                 return;
1470
1471         if (WSAStartup(MAKEWORD(2,2), &wsa))
1472                 die("unable to initialize winsock subsystem, error %d",
1473                         WSAGetLastError());
1474
1475         for (name = libraries; *name; name++) {
1476                 ipv6_dll = LoadLibrary(*name);
1477                 if (!ipv6_dll)
1478                         continue;
1479
1480                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1481                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1482                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1483                                                    const struct addrinfo *,
1484                                                    struct addrinfo **))
1485                         GetProcAddress(ipv6_dll, "getaddrinfo");
1486                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1487                                                    socklen_t, char *, DWORD,
1488                                                    char *, DWORD, int))
1489                         GetProcAddress(ipv6_dll, "getnameinfo");
1490                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1491                         FreeLibrary(ipv6_dll);
1492                         ipv6_dll = NULL;
1493                 } else
1494                         break;
1495         }
1496         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1497                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1498                 ipv6_getaddrinfo = getaddrinfo_stub;
1499                 ipv6_getnameinfo = getnameinfo_stub;
1500         }
1501
1502         atexit(socket_cleanup);
1503         initialized = 1;
1504 }
1505
1506 #undef gethostname
1507 int mingw_gethostname(char *name, int namelen)
1508 {
1509     ensure_socket_initialization();
1510     return gethostname(name, namelen);
1511 }
1512
1513 #undef gethostbyname
1514 struct hostent *mingw_gethostbyname(const char *host)
1515 {
1516         ensure_socket_initialization();
1517         return gethostbyname(host);
1518 }
1519
1520 void mingw_freeaddrinfo(struct addrinfo *res)
1521 {
1522         ipv6_freeaddrinfo(res);
1523 }
1524
1525 int mingw_getaddrinfo(const char *node, const char *service,
1526                       const struct addrinfo *hints, struct addrinfo **res)
1527 {
1528         ensure_socket_initialization();
1529         return ipv6_getaddrinfo(node, service, hints, res);
1530 }
1531
1532 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1533                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1534                       int flags)
1535 {
1536         ensure_socket_initialization();
1537         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1538 }
1539
1540 int mingw_socket(int domain, int type, int protocol)
1541 {
1542         int sockfd;
1543         SOCKET s;
1544
1545         ensure_socket_initialization();
1546         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1547         if (s == INVALID_SOCKET) {
1548                 /*
1549                  * WSAGetLastError() values are regular BSD error codes
1550                  * biased by WSABASEERR.
1551                  * However, strerror() does not know about networking
1552                  * specific errors, which are values beginning at 38 or so.
1553                  * Therefore, we choose to leave the biased error code
1554                  * in errno so that _if_ someone looks up the code somewhere,
1555                  * then it is at least the number that are usually listed.
1556                  */
1557                 errno = WSAGetLastError();
1558                 return -1;
1559         }
1560         /* convert into a file descriptor */
1561         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1562                 closesocket(s);
1563                 return error("unable to make a socket file descriptor: %s",
1564                         strerror(errno));
1565         }
1566         return sockfd;
1567 }
1568
1569 #undef connect
1570 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1571 {
1572         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1573         return connect(s, sa, sz);
1574 }
1575
1576 #undef bind
1577 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1578 {
1579         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1580         return bind(s, sa, sz);
1581 }
1582
1583 #undef setsockopt
1584 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1585 {
1586         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1587         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1588 }
1589
1590 #undef shutdown
1591 int mingw_shutdown(int sockfd, int how)
1592 {
1593         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1594         return shutdown(s, how);
1595 }
1596
1597 #undef listen
1598 int mingw_listen(int sockfd, int backlog)
1599 {
1600         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1601         return listen(s, backlog);
1602 }
1603
1604 #undef accept
1605 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1606 {
1607         int sockfd2;
1608
1609         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1610         SOCKET s2 = accept(s1, sa, sz);
1611
1612         /* convert into a file descriptor */
1613         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1614                 int err = errno;
1615                 closesocket(s2);
1616                 return error("unable to make a socket file descriptor: %s",
1617                         strerror(err));
1618         }
1619         return sockfd2;
1620 }
1621
1622 #undef rename
1623 int mingw_rename(const char *pold, const char *pnew)
1624 {
1625         DWORD attrs, gle;
1626         int tries = 0;
1627         wchar_t wpold[MAX_LONG_PATH], wpnew[MAX_LONG_PATH];
1628         if (xutftowcs_long_path(wpold, pold) < 0 ||
1629             xutftowcs_long_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_LONG_PATH], wnewpath[MAX_LONG_PATH];
1906         if (xutftowcs_long_path(woldpath, oldpath) < 0 ||
1907             xutftowcs_long_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 int mingw_offset_1st_component(const char *path)
1980 {
1981         int offset = 0;
1982         if (has_dos_drive_prefix(path))
1983                 offset = 2;
1984
1985         /* unc paths */
1986         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1987
1988                 /* skip server name */
1989                 char *pos = strpbrk(path + 2, "\\/");
1990                 if (!pos)
1991                         return 0; /* Error: malformed unc path */
1992
1993                 do {
1994                         pos++;
1995                 } while (*pos && !is_dir_sep(*pos));
1996
1997                 offset = pos - path;
1998         }
1999
2000         return offset + is_dir_sep(path[offset]);
2001 }
2002
2003 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2004 {
2005         int upos = 0, wpos = 0;
2006         const unsigned char *utf = (const unsigned char*) utfs;
2007         if (!utf || !wcs || wcslen < 1) {
2008                 errno = EINVAL;
2009                 return -1;
2010         }
2011         /* reserve space for \0 */
2012         wcslen--;
2013         if (utflen < 0)
2014                 utflen = INT_MAX;
2015
2016         while (upos < utflen) {
2017                 int c = utf[upos++] & 0xff;
2018                 if (utflen == INT_MAX && c == 0)
2019                         break;
2020
2021                 if (wpos >= wcslen) {
2022                         wcs[wpos] = 0;
2023                         errno = ERANGE;
2024                         return -1;
2025                 }
2026
2027                 if (c < 0x80) {
2028                         /* ASCII */
2029                         wcs[wpos++] = c;
2030                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2031                                 (utf[upos] & 0xc0) == 0x80) {
2032                         /* 2-byte utf-8 */
2033                         c = ((c & 0x1f) << 6);
2034                         c |= (utf[upos++] & 0x3f);
2035                         wcs[wpos++] = c;
2036                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2037                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2038                                 (utf[upos] & 0xc0) == 0x80 &&
2039                                 (utf[upos + 1] & 0xc0) == 0x80) {
2040                         /* 3-byte utf-8 */
2041                         c = ((c & 0x0f) << 12);
2042                         c |= ((utf[upos++] & 0x3f) << 6);
2043                         c |= (utf[upos++] & 0x3f);
2044                         wcs[wpos++] = c;
2045                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2046                                 wpos + 1 < wcslen &&
2047                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2048                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2049                                 (utf[upos] & 0xc0) == 0x80 &&
2050                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2051                                 (utf[upos + 2] & 0xc0) == 0x80) {
2052                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2053                         c = ((c & 0x07) << 18);
2054                         c |= ((utf[upos++] & 0x3f) << 12);
2055                         c |= ((utf[upos++] & 0x3f) << 6);
2056                         c |= (utf[upos++] & 0x3f);
2057                         c -= 0x10000;
2058                         wcs[wpos++] = 0xd800 | (c >> 10);
2059                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2060                 } else if (c >= 0xa0) {
2061                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2062                         wcs[wpos++] = c;
2063                 } else {
2064                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2065                         static const char *hex = "0123456789abcdef";
2066                         wcs[wpos++] = hex[c >> 4];
2067                         if (wpos < wcslen)
2068                                 wcs[wpos++] = hex[c & 0x0f];
2069                 }
2070         }
2071         wcs[wpos] = 0;
2072         return wpos;
2073 }
2074
2075 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2076 {
2077         if (!wcs || !utf || utflen < 1) {
2078                 errno = EINVAL;
2079                 return -1;
2080         }
2081         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2082         if (utflen)
2083                 return utflen - 1;
2084         errno = ERANGE;
2085         return -1;
2086 }
2087
2088 int handle_long_path(wchar_t *path, int len, int max_path, int expand)
2089 {
2090         int result;
2091         wchar_t buf[MAX_LONG_PATH];
2092
2093         /*
2094          * we don't need special handling if path is relative to the current
2095          * directory, and current directory + path don't exceed the desired
2096          * max_path limit. This should cover > 99 % of cases with minimal
2097          * performance impact (git almost always uses relative paths).
2098          */
2099         if ((len < 2 || (!is_dir_sep(path[0]) && path[1] != ':')) &&
2100             (current_directory_len + len < max_path))
2101                 return len;
2102
2103         /*
2104          * handle everything else:
2105          * - absolute paths: "C:\dir\file"
2106          * - absolute UNC paths: "\\server\share\dir\file"
2107          * - absolute paths on current drive: "\dir\file"
2108          * - relative paths on other drive: "X:file"
2109          * - prefixed paths: "\\?\...", "\\.\..."
2110          */
2111
2112         /* convert to absolute path using GetFullPathNameW */
2113         result = GetFullPathNameW(path, MAX_LONG_PATH, buf, NULL);
2114         if (!result) {
2115                 errno = err_win_to_posix(GetLastError());
2116                 return -1;
2117         }
2118
2119         /*
2120          * return absolute path if it fits within max_path (even if
2121          * "cwd + path" doesn't due to '..' components)
2122          */
2123         if (result < max_path) {
2124                 wcscpy(path, buf);
2125                 return result;
2126         }
2127
2128         /* error out if we shouldn't expand the path or buf is too small */
2129         if (!expand || result >= MAX_LONG_PATH - 6) {
2130                 errno = ENAMETOOLONG;
2131                 return -1;
2132         }
2133
2134         /* prefix full path with "\\?\" or "\\?\UNC\" */
2135         if (buf[0] == '\\') {
2136                 /* ...unless already prefixed */
2137                 if (buf[1] == '\\' && (buf[2] == '?' || buf[2] == '.'))
2138                         return len;
2139
2140                 wcscpy(path, L"\\\\?\\UNC\\");
2141                 wcscpy(path + 8, buf + 2);
2142                 return result + 6;
2143         } else {
2144                 wcscpy(path, L"\\\\?\\");
2145                 wcscpy(path + 4, buf);
2146                 return result + 4;
2147         }
2148 }
2149
2150 /*
2151  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2152  * mingw startup code, see init.c in mingw runtime).
2153  */
2154 int _CRT_glob = 0;
2155
2156 typedef struct {
2157         int newmode;
2158 } _startupinfo;
2159
2160 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2161                 _startupinfo *si);
2162
2163 static NORETURN void die_startup()
2164 {
2165         fputs("fatal: not enough memory for initialization", stderr);
2166         exit(128);
2167 }
2168
2169 static void *malloc_startup(size_t size)
2170 {
2171         void *result = malloc(size);
2172         if (!result)
2173                 die_startup();
2174         return result;
2175 }
2176
2177 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2178 {
2179         len = xwcstoutf(buffer, wcs, len) + 1;
2180         return memcpy(malloc_startup(len), buffer, len);
2181 }
2182
2183 void mingw_startup()
2184 {
2185         int i, maxlen, argc;
2186         char *buffer;
2187         wchar_t **wenv, **wargv;
2188         _startupinfo si;
2189
2190         /* get wide char arguments and environment */
2191         si.newmode = 0;
2192         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2193                 die_startup();
2194
2195         /* determine size of argv and environ conversion buffer */
2196         maxlen = wcslen(_wpgmptr);
2197         for (i = 1; i < argc; i++)
2198                 maxlen = max(maxlen, wcslen(wargv[i]));
2199         for (i = 0; wenv[i]; i++)
2200                 maxlen = max(maxlen, wcslen(wenv[i]));
2201
2202         /*
2203          * nedmalloc can't free CRT memory, allocate resizable environment
2204          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2205          * use it while initializing the environment itself.
2206          */
2207         environ_size = i + 1;
2208         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2209         environ = malloc_startup(environ_alloc);
2210
2211         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2212         maxlen = 3 * maxlen + 1;
2213         buffer = malloc_startup(maxlen);
2214
2215         /* convert command line arguments and environment to UTF-8 */
2216         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2217         for (i = 1; i < argc; i++)
2218                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2219         for (i = 0; wenv[i]; i++)
2220                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2221         environ[i] = NULL;
2222         free(buffer);
2223
2224         /* sort environment for O(log n) getenv / putenv */
2225         qsort(environ, i, sizeof(char*), compareenv);
2226
2227         /* fix Windows specific environment settings */
2228
2229         /* on Windows it is TMP and TEMP */
2230         if (!mingw_getenv("TMPDIR")) {
2231                 const char *tmp = mingw_getenv("TMP");
2232                 if (!tmp)
2233                         tmp = mingw_getenv("TEMP");
2234                 if (tmp)
2235                         setenv("TMPDIR", tmp, 1);
2236         }
2237
2238         /* simulate TERM to enable auto-color (see color.c) */
2239         if (!getenv("TERM"))
2240                 setenv("TERM", "cygwin", 1);
2241
2242         /* initialize critical section for waitpid pinfo_t list */
2243         InitializeCriticalSection(&pinfo_cs);
2244
2245         /* set up default file mode and file modes for stdin/out/err */
2246         _fmode = _O_BINARY;
2247         _setmode(_fileno(stdin), _O_BINARY);
2248         _setmode(_fileno(stdout), _O_BINARY);
2249         _setmode(_fileno(stderr), _O_BINARY);
2250
2251         /* initialize Unicode console */
2252         winansi_init();
2253
2254         /* init length of current directory for handle_long_path */
2255         current_directory_len = GetCurrentDirectoryW(0, NULL);
2256 }