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