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 static int compareenv(const void *a, const void *b)
 717 {
 718         char *const *ea = a;
 719         char *const *eb = b;
 720         return strcasecmp(*ea, *eb);
 721 }
 722
 723 static int lookupenv(char **env, const char *name, size_t nmln)
 724 {
 725         int i;
 726
 727         for (i = 0; env[i]; i++) {
 728                 if (!strncasecmp(env[i], name, nmln) && '=' == env[i][nmln])
 729                         /* matches */
 730                         return i;
 731         }
 732         return -1;
 733 }
 734
 735 /*
 736  * If name contains '=', then sets the variable, otherwise it unsets it
 737  */
 738 static char **do_putenv(char **env, const char *name, int free_old)
 739 {
 740         char *eq = strchrnul(name, '=');
 741         int i = lookupenv(env, name, eq-name);
 742
 743         if (i < 0) {
 744                 if (*eq) {
 745                         for (i = 0; env[i]; i++)
 746                                 ;
 747                         env = xrealloc(env, (i+2)*sizeof(*env));
 748                         env[i] = (char*) name;
 749                         env[i+1] = NULL;
 750                 }
 751         }
 752         else {
 753                 if (free_old)
 754                         free(env[i]);
 755                 if (*eq)
 756                         env[i] = (char*) name;
 757                 else
 758                         for (; env[i]; i++)
 759                                 env[i] = env[i+1];
 760         }
 761         return env;
 762 }
 763
 764 #undef getenv
 765 char *mingw_getenv(const char *name)
 766 {
 767         char *result = getenv(name);
 768         if (!result && !strcmp(name, "TMPDIR")) {
 769                 /* on Windows it is TMP and TEMP */
 770                 result = getenv("TMP");
 771                 if (!result)
 772                         result = getenv("TEMP");
 773         }
 774         else if (!result && !strcmp(name, "TERM")) {
 775                 /* simulate TERM to enable auto-color (see color.c) */
 776                 result = "winansi";
 777         }
 778         return result;
 779 }
 780
 781 int mingw_putenv(const char *namevalue)
 782 {
 783         environ = do_putenv(environ, namevalue, 1);
 784         return 0;
 785 }
 786
 787 /*
 788  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 789  * (Parsing C++ Command-Line Arguments)
 790  */
 791 static const char *quote_arg(const char *arg)
 792 {
 793         /* count chars to quote */
 794         int len = 0, n = 0;
 795         int force_quotes = 0;
 796         char *q, *d;
 797         const char *p = arg;
 798         if (!*p) force_quotes = 1;
 799         while (*p) {
 800                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 801                         force_quotes = 1;
 802                 else if (*p == '"')
 803                         n++;
 804                 else if (*p == '\\') {
 805                         int count = 0;
 806                         while (*p == '\\') {
 807                                 count++;
 808                                 p++;
 809                                 len++;
 810                         }
 811                         if (*p == '"')
 812                                 n += count*2 + 1;
 813                         continue;
 814                 }
 815                 len++;
 816                 p++;
 817         }
 818         if (!force_quotes && n == 0)
 819                 return arg;
 820
 821         /* insert \ where necessary */
 822         d = q = xmalloc(len+n+3);
 823         *d++ = '"';
 824         while (*arg) {
 825                 if (*arg == '"')
 826                         *d++ = '\\';
 827                 else if (*arg == '\\') {
 828                         int count = 0;
 829                         while (*arg == '\\') {
 830                                 count++;
 831                                 *d++ = *arg++;
 832                         }
 833                         if (*arg == '"') {
 834                                 while (count-- > 0)
 835                                         *d++ = '\\';
 836                                 *d++ = '\\';
 837                         }
 838                 }
 839                 *d++ = *arg++;
 840         }
 841         *d++ = '"';
 842         *d++ = 0;
 843         return q;
 844 }
 845
 846 static const char *parse_interpreter(const char *cmd)
 847 {
 848         static char buf[100];
 849         char *p, *opt;
 850         int n, fd;
 851
 852         /* don't even try a .exe */
 853         n = strlen(cmd);
 854         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 855                 return NULL;
 856
 857         fd = open(cmd, O_RDONLY);
 858         if (fd < 0)
 859                 return NULL;
 860         n = read(fd, buf, sizeof(buf)-1);
 861         close(fd);
 862         if (n < 4)      /* at least '#!/x' and not error */
 863                 return NULL;
 864
 865         if (buf[0] != '#' || buf[1] != '!')
 866                 return NULL;
 867         buf[n] = '\0';
 868         p = buf + strcspn(buf, "\r\n");
 869         if (!*p)
 870                 return NULL;
 871
 872         *p = '\0';
 873         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 874                 return NULL;
 875         /* strip options */
 876         if ((opt = strchr(p+1, ' ')))
 877                 *opt = '\0';
 878         return p+1;
 879 }
 880
 881 /*
 882  * Splits the PATH into parts.
 883  */
 884 static char **get_path_split(void)
 885 {
 886         char *p, **path, *envpath = getenv("PATH");
 887         int i, n = 0;
 888
 889         if (!envpath || !*envpath)
 890                 return NULL;
 891
 892         envpath = xstrdup(envpath);
 893         p = envpath;
 894         while (p) {
 895                 char *dir = p;
 896                 p = strchr(p, ';');
 897                 if (p) *p++ = '\0';
 898                 if (*dir) {     /* not earlier, catches series of ; */
 899                         ++n;
 900                 }
 901         }
 902         if (!n)
 903                 return NULL;
 904
 905         path = xmalloc((n+1)*sizeof(char *));
 906         p = envpath;
 907         i = 0;
 908         do {
 909                 if (*p)
 910                         path[i++] = xstrdup(p);
 911                 p = p+strlen(p)+1;
 912         } while (i < n);
 913         path[i] = NULL;
 914
 915         free(envpath);
 916
 917         return path;
 918 }
 919
 920 static void free_path_split(char **path)
 921 {
 922         char **p = path;
 923
 924         if (!path)
 925                 return;
 926
 927         while (*p)
 928                 free(*p++);
 929         free(path);
 930 }
 931
 932 /*
 933  * exe_only means that we only want to detect .exe files, but not scripts
 934  * (which do not have an extension)
 935  */
 936 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 937 {
 938         char path[MAX_PATH];
 939         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 940
 941         if (!isexe && access(path, F_OK) == 0)
 942                 return xstrdup(path);
 943         path[strlen(path)-4] = '\0';
 944         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 945                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 946                         return xstrdup(path);
 947         return NULL;
 948 }
 949
 950 /*
 951  * Determines the absolute path of cmd using the split path in path.
 952  * If cmd contains a slash or backslash, no lookup is performed.
 953  */
 954 static char *path_lookup(const char *cmd, char **path, int exe_only)
 955 {
 956         char *prog = NULL;
 957         int len = strlen(cmd);
 958         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 959
 960         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 961                 prog = xstrdup(cmd);
 962
 963         while (!prog && *path)
 964                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 965
 966         return prog;
 967 }
 968
 969 /*
 970  * Create environment block suitable for CreateProcess. Merges current
 971  * process environment and the supplied environment changes.
 972  */
 973 static wchar_t *make_environment_block(char **deltaenv)
 974 {
 975         wchar_t *wenvblk = NULL;
 976         int count = 0;
 977         char **e, **tmpenv;
 978         int size = 0, wenvsz = 0, wenvpos = 0;
 979
 980         while (environ[count])
 981                 count++;
 982
 983         /* copy the environment */
 984         tmpenv = xmalloc(sizeof(*tmpenv) * (count + 1));
 985         memcpy(tmpenv, environ, sizeof(*tmpenv) * (count + 1));
 986
 987         /* merge supplied environment changes into the temporary environment */
 988         for (e = deltaenv; e && *e; e++)
 989                 tmpenv = do_putenv(tmpenv, *e, 0);
 990
 991         /* environment must be sorted */
 992         for (count = 0; tmpenv[count]; )
 993                 count++;
 994         qsort(tmpenv, count, sizeof(*tmpenv), compareenv);
 995
 996         /* create environment block from temporary environment */
 997         for (e = tmpenv; *e; e++) {
 998                 size = 2 * strlen(*e) + 2; /* +2 for final \0 */
 999                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1000                 wenvpos += xutftowcs(&wenvblk[wenvpos], *e, size) + 1;
1001         }
1002         /* add final \0 terminator */
1003         wenvblk[wenvpos] = 0;
1004         free(tmpenv);
1005         return wenvblk;
1006 }
1007
1008 struct pinfo_t {
1009         struct pinfo_t *next;
1010         pid_t pid;
1011         HANDLE proc;
1012 };
1013 static struct pinfo_t *pinfo = NULL;
1014 CRITICAL_SECTION pinfo_cs;
1015
1016 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1017                               const char *dir,
1018                               int prepend_cmd, int fhin, int fhout, int fherr)
1019 {
1020         STARTUPINFOW si;
1021         PROCESS_INFORMATION pi;
1022         struct strbuf args;
1023         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1024         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1025         BOOL ret;
1026
1027         /* Determine whether or not we are associated to a console */
1028         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1029                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1030                         FILE_ATTRIBUTE_NORMAL, NULL);
1031         if (cons == INVALID_HANDLE_VALUE) {
1032                 /* There is no console associated with this process.
1033                  * Since the child is a console process, Windows
1034                  * would normally create a console window. But
1035                  * since we'll be redirecting std streams, we do
1036                  * not need the console.
1037                  * It is necessary to use DETACHED_PROCESS
1038                  * instead of CREATE_NO_WINDOW to make ssh
1039                  * recognize that it has no console.
1040                  */
1041                 flags |= DETACHED_PROCESS;
1042         } else {
1043                 /* There is already a console. If we specified
1044                  * DETACHED_PROCESS here, too, Windows would
1045                  * disassociate the child from the console.
1046                  * The same is true for CREATE_NO_WINDOW.
1047                  * Go figure!
1048                  */
1049                 CloseHandle(cons);
1050         }
1051         memset(&si, 0, sizeof(si));
1052         si.cb = sizeof(si);
1053         si.dwFlags = STARTF_USESTDHANDLES;
1054         si.hStdInput = winansi_get_osfhandle(fhin);
1055         si.hStdOutput = winansi_get_osfhandle(fhout);
1056         si.hStdError = winansi_get_osfhandle(fherr);
1057
1058         if (xutftowcs_path(wcmd, cmd) < 0)
1059                 return -1;
1060         if (dir && xutftowcs_path(wdir, dir) < 0)
1061                 return -1;
1062
1063         /* concatenate argv, quoting args as we go */
1064         strbuf_init(&args, 0);
1065         if (prepend_cmd) {
1066                 char *quoted = (char *)quote_arg(cmd);
1067                 strbuf_addstr(&args, quoted);
1068                 if (quoted != cmd)
1069                         free(quoted);
1070         }
1071         for (; *argv; argv++) {
1072                 char *quoted = (char *)quote_arg(*argv);
1073                 if (*args.buf)
1074                         strbuf_addch(&args, ' ');
1075                 strbuf_addstr(&args, quoted);
1076                 if (quoted != *argv)
1077                         free(quoted);
1078         }
1079
1080         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1081         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1082         strbuf_release(&args);
1083
1084         wenvblk = make_environment_block(deltaenv);
1085
1086         memset(&pi, 0, sizeof(pi));
1087         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1088                 wenvblk, dir ? wdir : NULL, &si, &pi);
1089
1090         free(wenvblk);
1091         free(wargs);
1092
1093         if (!ret) {
1094                 errno = ENOENT;
1095                 return -1;
1096         }
1097         CloseHandle(pi.hThread);
1098
1099         /*
1100          * The process ID is the human-readable identifier of the process
1101          * that we want to present in log and error messages. The handle
1102          * is not useful for this purpose. But we cannot close it, either,
1103          * because it is not possible to turn a process ID into a process
1104          * handle after the process terminated.
1105          * Keep the handle in a list for waitpid.
1106          */
1107         EnterCriticalSection(&pinfo_cs);
1108         {
1109                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1110                 info->pid = pi.dwProcessId;
1111                 info->proc = pi.hProcess;
1112                 info->next = pinfo;
1113                 pinfo = info;
1114         }
1115         LeaveCriticalSection(&pinfo_cs);
1116
1117         return (pid_t)pi.dwProcessId;
1118 }
1119
1120 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1121 {
1122         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1123 }
1124
1125 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1126                      const char *dir,
1127                      int fhin, int fhout, int fherr)
1128 {
1129         pid_t pid;
1130         char **path = get_path_split();
1131         char *prog = path_lookup(cmd, path, 0);
1132
1133         if (!prog) {
1134                 errno = ENOENT;
1135                 pid = -1;
1136         }
1137         else {
1138                 const char *interpr = parse_interpreter(prog);
1139
1140                 if (interpr) {
1141                         const char *argv0 = argv[0];
1142                         char *iprog = path_lookup(interpr, path, 1);
1143                         argv[0] = prog;
1144                         if (!iprog) {
1145                                 errno = ENOENT;
1146                                 pid = -1;
1147                         }
1148                         else {
1149                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1150                                                        fhin, fhout, fherr);
1151                                 free(iprog);
1152                         }
1153                         argv[0] = argv0;
1154                 }
1155                 else
1156                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1157                                                fhin, fhout, fherr);
1158                 free(prog);
1159         }
1160         free_path_split(path);
1161         return pid;
1162 }
1163
1164 static int try_shell_exec(const char *cmd, char *const *argv)
1165 {
1166         const char *interpr = parse_interpreter(cmd);
1167         char **path;
1168         char *prog;
1169         int pid = 0;
1170
1171         if (!interpr)
1172                 return 0;
1173         path = get_path_split();
1174         prog = path_lookup(interpr, path, 1);
1175         if (prog) {
1176                 int argc = 0;
1177                 const char **argv2;
1178                 while (argv[argc]) argc++;
1179                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1180                 argv2[0] = (char *)cmd; /* full path to the script file */
1181                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1182                 pid = mingw_spawnv(prog, argv2, 1);
1183                 if (pid >= 0) {
1184                         int status;
1185                         if (waitpid(pid, &status, 0) < 0)
1186                                 status = 255;
1187                         exit(status);
1188                 }
1189                 pid = 1;        /* indicate that we tried but failed */
1190                 free(prog);
1191                 free(argv2);
1192         }
1193         free_path_split(path);
1194         return pid;
1195 }
1196
1197 int mingw_execv(const char *cmd, char *const *argv)
1198 {
1199         /* check if git_command is a shell script */
1200         if (!try_shell_exec(cmd, argv)) {
1201                 int pid, status;
1202
1203                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1204                 if (pid < 0)
1205                         return -1;
1206                 if (waitpid(pid, &status, 0) < 0)
1207                         status = 255;
1208                 exit(status);
1209         }
1210         return -1;
1211 }
1212
1213 int mingw_execvp(const char *cmd, char *const *argv)
1214 {
1215         char **path = get_path_split();
1216         char *prog = path_lookup(cmd, path, 0);
1217
1218         if (prog) {
1219                 mingw_execv(prog, argv);
1220                 free(prog);
1221         } else
1222                 errno = ENOENT;
1223
1224         free_path_split(path);
1225         return -1;
1226 }
1227
1228 int mingw_kill(pid_t pid, int sig)
1229 {
1230         if (pid > 0 && sig == SIGTERM) {
1231                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1232
1233                 if (TerminateProcess(h, -1)) {
1234                         CloseHandle(h);
1235                         return 0;
1236                 }
1237
1238                 errno = err_win_to_posix(GetLastError());
1239                 CloseHandle(h);
1240                 return -1;
1241         } else if (pid > 0 && sig == 0) {
1242                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1243                 if (h) {
1244                         CloseHandle(h);
1245                         return 0;
1246                 }
1247         }
1248
1249         errno = EINVAL;
1250         return -1;
1251 }
1252
1253 /*
1254  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1255  * that service contains a numerical port, or that it is null. It
1256  * does a simple search using gethostbyname, and returns one IPv4 host
1257  * if one was found.
1258  */
1259 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1260                                    const struct addrinfo *hints,
1261                                    struct addrinfo **res)
1262 {
1263         struct hostent *h = NULL;
1264         struct addrinfo *ai;
1265         struct sockaddr_in *sin;
1266
1267         if (node) {
1268                 h = gethostbyname(node);
1269                 if (!h)
1270                         return WSAGetLastError();
1271         }
1272
1273         ai = xmalloc(sizeof(struct addrinfo));
1274         *res = ai;
1275         ai->ai_flags = 0;
1276         ai->ai_family = AF_INET;
1277         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1278         switch (ai->ai_socktype) {
1279         case SOCK_STREAM:
1280                 ai->ai_protocol = IPPROTO_TCP;
1281                 break;
1282         case SOCK_DGRAM:
1283                 ai->ai_protocol = IPPROTO_UDP;
1284                 break;
1285         default:
1286                 ai->ai_protocol = 0;
1287                 break;
1288         }
1289         ai->ai_addrlen = sizeof(struct sockaddr_in);
1290         if (hints && (hints->ai_flags & AI_CANONNAME))
1291                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1292         else
1293                 ai->ai_canonname = NULL;
1294
1295         sin = xmalloc(ai->ai_addrlen);
1296         memset(sin, 0, ai->ai_addrlen);
1297         sin->sin_family = AF_INET;
1298         /* Note: getaddrinfo is supposed to allow service to be a string,
1299          * which should be looked up using getservbyname. This is
1300          * currently not implemented */
1301         if (service)
1302                 sin->sin_port = htons(atoi(service));
1303         if (h)
1304                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1305         else if (hints && (hints->ai_flags & AI_PASSIVE))
1306                 sin->sin_addr.s_addr = INADDR_ANY;
1307         else
1308                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1309         ai->ai_addr = (struct sockaddr *)sin;
1310         ai->ai_next = NULL;
1311         return 0;
1312 }
1313
1314 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1315 {
1316         free(res->ai_canonname);
1317         free(res->ai_addr);
1318         free(res);
1319 }
1320
1321 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1322                                    char *host, DWORD hostlen,
1323                                    char *serv, DWORD servlen, int flags)
1324 {
1325         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1326         if (sa->sa_family != AF_INET)
1327                 return EAI_FAMILY;
1328         if (!host && !serv)
1329                 return EAI_NONAME;
1330
1331         if (host && hostlen > 0) {
1332                 struct hostent *ent = NULL;
1333                 if (!(flags & NI_NUMERICHOST))
1334                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1335                                             sizeof(sin->sin_addr), AF_INET);
1336
1337                 if (ent)
1338                         snprintf(host, hostlen, "%s", ent->h_name);
1339                 else if (flags & NI_NAMEREQD)
1340                         return EAI_NONAME;
1341                 else
1342                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1343         }
1344
1345         if (serv && servlen > 0) {
1346                 struct servent *ent = NULL;
1347                 if (!(flags & NI_NUMERICSERV))
1348                         ent = getservbyport(sin->sin_port,
1349                                             flags & NI_DGRAM ? "udp" : "tcp");
1350
1351                 if (ent)
1352                         snprintf(serv, servlen, "%s", ent->s_name);
1353                 else
1354                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1355         }
1356
1357         return 0;
1358 }
1359
1360 static HMODULE ipv6_dll = NULL;
1361 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1362 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1363                                       const struct addrinfo *hints,
1364                                       struct addrinfo **res);
1365 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1366                                       char *host, DWORD hostlen,
1367                                       char *serv, DWORD servlen, int flags);
1368 /*
1369  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1370  * don't need to try to load that one dynamically.
1371  */
1372
1373 static void socket_cleanup(void)
1374 {
1375         WSACleanup();
1376         if (ipv6_dll)
1377                 FreeLibrary(ipv6_dll);
1378         ipv6_dll = NULL;
1379         ipv6_freeaddrinfo = freeaddrinfo_stub;
1380         ipv6_getaddrinfo = getaddrinfo_stub;
1381         ipv6_getnameinfo = getnameinfo_stub;
1382 }
1383
1384 static void ensure_socket_initialization(void)
1385 {
1386         WSADATA wsa;
1387         static int initialized = 0;
1388         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1389         const char **name;
1390
1391         if (initialized)
1392                 return;
1393
1394         if (WSAStartup(MAKEWORD(2,2), &wsa))
1395                 die("unable to initialize winsock subsystem, error %d",
1396                         WSAGetLastError());
1397
1398         for (name = libraries; *name; name++) {
1399                 ipv6_dll = LoadLibrary(*name);
1400                 if (!ipv6_dll)
1401                         continue;
1402
1403                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1404                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1405                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1406                                                    const struct addrinfo *,
1407                                                    struct addrinfo **))
1408                         GetProcAddress(ipv6_dll, "getaddrinfo");
1409                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1410                                                    socklen_t, char *, DWORD,
1411                                                    char *, DWORD, int))
1412                         GetProcAddress(ipv6_dll, "getnameinfo");
1413                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1414                         FreeLibrary(ipv6_dll);
1415                         ipv6_dll = NULL;
1416                 } else
1417                         break;
1418         }
1419         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1420                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1421                 ipv6_getaddrinfo = getaddrinfo_stub;
1422                 ipv6_getnameinfo = getnameinfo_stub;
1423         }
1424
1425         atexit(socket_cleanup);
1426         initialized = 1;
1427 }
1428
1429 #undef gethostname
1430 int mingw_gethostname(char *name, int namelen)
1431 {
1432     ensure_socket_initialization();
1433     return gethostname(name, namelen);
1434 }
1435
1436 #undef gethostbyname
1437 struct hostent *mingw_gethostbyname(const char *host)
1438 {
1439         ensure_socket_initialization();
1440         return gethostbyname(host);
1441 }
1442
1443 void mingw_freeaddrinfo(struct addrinfo *res)
1444 {
1445         ipv6_freeaddrinfo(res);
1446 }
1447
1448 int mingw_getaddrinfo(const char *node, const char *service,
1449                       const struct addrinfo *hints, struct addrinfo **res)
1450 {
1451         ensure_socket_initialization();
1452         return ipv6_getaddrinfo(node, service, hints, res);
1453 }
1454
1455 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1456                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1457                       int flags)
1458 {
1459         ensure_socket_initialization();
1460         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1461 }
1462
1463 int mingw_socket(int domain, int type, int protocol)
1464 {
1465         int sockfd;
1466         SOCKET s;
1467
1468         ensure_socket_initialization();
1469         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1470         if (s == INVALID_SOCKET) {
1471                 /*
1472                  * WSAGetLastError() values are regular BSD error codes
1473                  * biased by WSABASEERR.
1474                  * However, strerror() does not know about networking
1475                  * specific errors, which are values beginning at 38 or so.
1476                  * Therefore, we choose to leave the biased error code
1477                  * in errno so that _if_ someone looks up the code somewhere,
1478                  * then it is at least the number that are usually listed.
1479                  */
1480                 errno = WSAGetLastError();
1481                 return -1;
1482         }
1483         /* convert into a file descriptor */
1484         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1485                 closesocket(s);
1486                 return error("unable to make a socket file descriptor: %s",
1487                         strerror(errno));
1488         }
1489         return sockfd;
1490 }
1491
1492 #undef connect
1493 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1494 {
1495         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1496         return connect(s, sa, sz);
1497 }
1498
1499 #undef bind
1500 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1501 {
1502         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1503         return bind(s, sa, sz);
1504 }
1505
1506 #undef setsockopt
1507 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1508 {
1509         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1510         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1511 }
1512
1513 #undef shutdown
1514 int mingw_shutdown(int sockfd, int how)
1515 {
1516         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1517         return shutdown(s, how);
1518 }
1519
1520 #undef listen
1521 int mingw_listen(int sockfd, int backlog)
1522 {
1523         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1524         return listen(s, backlog);
1525 }
1526
1527 #undef accept
1528 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1529 {
1530         int sockfd2;
1531
1532         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1533         SOCKET s2 = accept(s1, sa, sz);
1534
1535         /* convert into a file descriptor */
1536         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1537                 int err = errno;
1538                 closesocket(s2);
1539                 return error("unable to make a socket file descriptor: %s",
1540                         strerror(err));
1541         }
1542         return sockfd2;
1543 }
1544
1545 #undef rename
1546 int mingw_rename(const char *pold, const char *pnew)
1547 {
1548         DWORD attrs, gle;
1549         int tries = 0;
1550         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1551         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1552                 return -1;
1553
1554         /*
1555          * Try native rename() first to get errno right.
1556          * It is based on MoveFile(), which cannot overwrite existing files.
1557          */
1558         if (!_wrename(wpold, wpnew))
1559                 return 0;
1560         if (errno != EEXIST)
1561                 return -1;
1562 repeat:
1563         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1564                 return 0;
1565         /* TODO: translate more errors */
1566         gle = GetLastError();
1567         if (gle == ERROR_ACCESS_DENIED &&
1568             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1569                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1570                         errno = EISDIR;
1571                         return -1;
1572                 }
1573                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1574                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1575                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1576                                 return 0;
1577                         gle = GetLastError();
1578                         /* revert file attributes on failure */
1579                         SetFileAttributesW(wpnew, attrs);
1580                 }
1581         }
1582         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1583                 /*
1584                  * We assume that some other process had the source or
1585                  * destination file open at the wrong moment and retry.
1586                  * In order to give the other process a higher chance to
1587                  * complete its operation, we give up our time slice now.
1588                  * If we have to retry again, we do sleep a bit.
1589                  */
1590                 Sleep(delay[tries]);
1591                 tries++;
1592                 goto repeat;
1593         }
1594         if (gle == ERROR_ACCESS_DENIED &&
1595                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1596                        "Should I try again?", pold, pnew))
1597                 goto repeat;
1598
1599         errno = EACCES;
1600         return -1;
1601 }
1602
1603 /*
1604  * Note that this doesn't return the actual pagesize, but
1605  * the allocation granularity. If future Windows specific git code
1606  * needs the real getpagesize function, we need to find another solution.
1607  */
1608 int mingw_getpagesize(void)
1609 {
1610         SYSTEM_INFO si;
1611         GetSystemInfo(&si);
1612         return si.dwAllocationGranularity;
1613 }
1614
1615 struct passwd *getpwuid(int uid)
1616 {
1617         static char user_name[100];
1618         static struct passwd p;
1619
1620         DWORD len = sizeof(user_name);
1621         if (!GetUserName(user_name, &len))
1622                 return NULL;
1623         p.pw_name = user_name;
1624         p.pw_gecos = "unknown";
1625         p.pw_dir = NULL;
1626         return &p;
1627 }
1628
1629 static HANDLE timer_event;
1630 static HANDLE timer_thread;
1631 static int timer_interval;
1632 static int one_shot;
1633 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1634
1635 /* The timer works like this:
1636  * The thread, ticktack(), is a trivial routine that most of the time
1637  * only waits to receive the signal to terminate. The main thread tells
1638  * the thread to terminate by setting the timer_event to the signalled
1639  * state.
1640  * But ticktack() interrupts the wait state after the timer's interval
1641  * length to call the signal handler.
1642  */
1643
1644 static unsigned __stdcall ticktack(void *dummy)
1645 {
1646         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1647                 mingw_raise(SIGALRM);
1648                 if (one_shot)
1649                         break;
1650         }
1651         return 0;
1652 }
1653
1654 static int start_timer_thread(void)
1655 {
1656         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1657         if (timer_event) {
1658                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1659                 if (!timer_thread )
1660                         return errno = ENOMEM,
1661                                 error("cannot start timer thread");
1662         } else
1663                 return errno = ENOMEM,
1664                         error("cannot allocate resources for timer");
1665         return 0;
1666 }
1667
1668 static void stop_timer_thread(void)
1669 {
1670         if (timer_event)
1671                 SetEvent(timer_event);  /* tell thread to terminate */
1672         if (timer_thread) {
1673                 int rc = WaitForSingleObject(timer_thread, 1000);
1674                 if (rc == WAIT_TIMEOUT)
1675                         error("timer thread did not terminate timely");
1676                 else if (rc != WAIT_OBJECT_0)
1677                         error("waiting for timer thread failed: %lu",
1678                               GetLastError());
1679                 CloseHandle(timer_thread);
1680         }
1681         if (timer_event)
1682                 CloseHandle(timer_event);
1683         timer_event = NULL;
1684         timer_thread = NULL;
1685 }
1686
1687 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1688 {
1689         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1690 }
1691
1692 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1693 {
1694         static const struct timeval zero;
1695         static int atexit_done;
1696
1697         if (out != NULL)
1698                 return errno = EINVAL,
1699                         error("setitimer param 3 != NULL not implemented");
1700         if (!is_timeval_eq(&in->it_interval, &zero) &&
1701             !is_timeval_eq(&in->it_interval, &in->it_value))
1702                 return errno = EINVAL,
1703                         error("setitimer: it_interval must be zero or eq it_value");
1704
1705         if (timer_thread)
1706                 stop_timer_thread();
1707
1708         if (is_timeval_eq(&in->it_value, &zero) &&
1709             is_timeval_eq(&in->it_interval, &zero))
1710                 return 0;
1711
1712         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1713         one_shot = is_timeval_eq(&in->it_interval, &zero);
1714         if (!atexit_done) {
1715                 atexit(stop_timer_thread);
1716                 atexit_done = 1;
1717         }
1718         return start_timer_thread();
1719 }
1720
1721 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1722 {
1723         if (sig != SIGALRM)
1724                 return errno = EINVAL,
1725                         error("sigaction only implemented for SIGALRM");
1726         if (out != NULL)
1727                 return errno = EINVAL,
1728                         error("sigaction: param 3 != NULL not implemented");
1729
1730         timer_fn = in->sa_handler;
1731         return 0;
1732 }
1733
1734 #undef signal
1735 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1736 {
1737         sig_handler_t old;
1738
1739         switch (sig) {
1740         case SIGALRM:
1741                 old = timer_fn;
1742                 timer_fn = handler;
1743                 break;
1744
1745         case SIGINT:
1746                 old = sigint_fn;
1747                 sigint_fn = handler;
1748                 break;
1749
1750         default:
1751                 return signal(sig, handler);
1752         }
1753
1754         return old;
1755 }
1756
1757 #undef raise
1758 int mingw_raise(int sig)
1759 {
1760         switch (sig) {
1761         case SIGALRM:
1762                 if (timer_fn == SIG_DFL) {
1763                         if (isatty(STDERR_FILENO))
1764                                 fputs("Alarm clock\n", stderr);
1765                         exit(128 + SIGALRM);
1766                 } else if (timer_fn != SIG_IGN)
1767                         timer_fn(SIGALRM);
1768                 return 0;
1769
1770         case SIGINT:
1771                 if (sigint_fn == SIG_DFL)
1772                         exit(128 + SIGINT);
1773                 else if (sigint_fn != SIG_IGN)
1774                         sigint_fn(SIGINT);
1775                 return 0;
1776
1777         default:
1778                 return raise(sig);
1779         }
1780 }
1781
1782
1783 static const char *make_backslash_path(const char *path)
1784 {
1785         static char buf[PATH_MAX + 1];
1786         char *c;
1787
1788         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1789                 die("Too long path: %.*s", 60, path);
1790
1791         for (c = buf; *c; c++) {
1792                 if (*c == '/')
1793                         *c = '\\';
1794         }
1795         return buf;
1796 }
1797
1798 void mingw_open_html(const char *unixpath)
1799 {
1800         const char *htmlpath = make_backslash_path(unixpath);
1801         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1802                         const char *, const char *, const char *, INT);
1803         T ShellExecute;
1804         HMODULE shell32;
1805         int r;
1806
1807         shell32 = LoadLibrary("shell32.dll");
1808         if (!shell32)
1809                 die("cannot load shell32.dll");
1810         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1811         if (!ShellExecute)
1812                 die("cannot run browser");
1813
1814         printf("Launching default browser to display HTML ...\n");
1815         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1816         FreeLibrary(shell32);
1817         /* see the MSDN documentation referring to the result codes here */
1818         if (r <= 32) {
1819                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1820         }
1821 }
1822
1823 int link(const char *oldpath, const char *newpath)
1824 {
1825         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1826         static T create_hard_link = NULL;
1827         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1828         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1829                 xutftowcs_path(wnewpath, newpath) < 0)
1830                 return -1;
1831
1832         if (!create_hard_link) {
1833                 create_hard_link = (T) GetProcAddress(
1834                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1835                 if (!create_hard_link)
1836                         create_hard_link = (T)-1;
1837         }
1838         if (create_hard_link == (T)-1) {
1839                 errno = ENOSYS;
1840                 return -1;
1841         }
1842         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1843                 errno = err_win_to_posix(GetLastError());
1844                 return -1;
1845         }
1846         return 0;
1847 }
1848
1849 pid_t waitpid(pid_t pid, int *status, int options)
1850 {
1851         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1852             FALSE, pid);
1853         if (!h) {
1854                 errno = ECHILD;
1855                 return -1;
1856         }
1857
1858         if (pid > 0 && options & WNOHANG) {
1859                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1860                         CloseHandle(h);
1861                         return 0;
1862                 }
1863                 options &= ~WNOHANG;
1864         }
1865
1866         if (options == 0) {
1867                 struct pinfo_t **ppinfo;
1868                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1869                         CloseHandle(h);
1870                         return 0;
1871                 }
1872
1873                 if (status)
1874                         GetExitCodeProcess(h, (LPDWORD)status);
1875
1876                 EnterCriticalSection(&pinfo_cs);
1877
1878                 ppinfo = &pinfo;
1879                 while (*ppinfo) {
1880                         struct pinfo_t *info = *ppinfo;
1881                         if (info->pid == pid) {
1882                                 CloseHandle(info->proc);
1883                                 *ppinfo = info->next;
1884                                 free(info);
1885                                 break;
1886                         }
1887                         ppinfo = &info->next;
1888                 }
1889
1890                 LeaveCriticalSection(&pinfo_cs);
1891
1892                 CloseHandle(h);
1893                 return pid;
1894         }
1895         CloseHandle(h);
1896
1897         errno = EINVAL;
1898         return -1;
1899 }
1900
1901 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1902 {
1903         int upos = 0, wpos = 0;
1904         const unsigned char *utf = (const unsigned char*) utfs;
1905         if (!utf || !wcs || wcslen < 1) {
1906                 errno = EINVAL;
1907                 return -1;
1908         }
1909         /* reserve space for \0 */
1910         wcslen--;
1911         if (utflen < 0)
1912                 utflen = INT_MAX;
1913
1914         while (upos < utflen) {
1915                 int c = utf[upos++] & 0xff;
1916                 if (utflen == INT_MAX && c == 0)
1917                         break;
1918
1919                 if (wpos >= wcslen) {
1920                         wcs[wpos] = 0;
1921                         errno = ERANGE;
1922                         return -1;
1923                 }
1924
1925                 if (c < 0x80) {
1926                         /* ASCII */
1927                         wcs[wpos++] = c;
1928                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1929                                 (utf[upos] & 0xc0) == 0x80) {
1930                         /* 2-byte utf-8 */
1931                         c = ((c & 0x1f) << 6);
1932                         c |= (utf[upos++] & 0x3f);
1933                         wcs[wpos++] = c;
1934                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1935                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1936                                 (utf[upos] & 0xc0) == 0x80 &&
1937                                 (utf[upos + 1] & 0xc0) == 0x80) {
1938                         /* 3-byte utf-8 */
1939                         c = ((c & 0x0f) << 12);
1940                         c |= ((utf[upos++] & 0x3f) << 6);
1941                         c |= (utf[upos++] & 0x3f);
1942                         wcs[wpos++] = c;
1943                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
1944                                 wpos + 1 < wcslen &&
1945                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
1946                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
1947                                 (utf[upos] & 0xc0) == 0x80 &&
1948                                 (utf[upos + 1] & 0xc0) == 0x80 &&
1949                                 (utf[upos + 2] & 0xc0) == 0x80) {
1950                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
1951                         c = ((c & 0x07) << 18);
1952                         c |= ((utf[upos++] & 0x3f) << 12);
1953                         c |= ((utf[upos++] & 0x3f) << 6);
1954                         c |= (utf[upos++] & 0x3f);
1955                         c -= 0x10000;
1956                         wcs[wpos++] = 0xd800 | (c >> 10);
1957                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
1958                 } else if (c >= 0xa0) {
1959                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
1960                         wcs[wpos++] = c;
1961                 } else {
1962                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
1963                         static const char *hex = "0123456789abcdef";
1964                         wcs[wpos++] = hex[c >> 4];
1965                         if (wpos < wcslen)
1966                                 wcs[wpos++] = hex[c & 0x0f];
1967                 }
1968         }
1969         wcs[wpos] = 0;
1970         return wpos;
1971 }
1972
1973 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
1974 {
1975         if (!wcs || !utf || utflen < 1) {
1976                 errno = EINVAL;
1977                 return -1;
1978         }
1979         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
1980         if (utflen)
1981                 return utflen - 1;
1982         errno = ERANGE;
1983         return -1;
1984 }
1985
1986 /*
1987  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
1988  * mingw startup code, see init.c in mingw runtime).
1989  */
1990 int _CRT_glob = 0;
1991
1992 typedef struct {
1993         int newmode;
1994 } _startupinfo;
1995
1996 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
1997                 _startupinfo *si);
1998
1999 void mingw_startup()
2000 {
2001         int i, len, maxlen, argc;
2002         char *buffer;
2003         wchar_t **wenv, **wargv;
2004         _startupinfo si;
2005
2006         /* get wide char arguments and environment */
2007         si.newmode = 0;
2008         __wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si);
2009
2010         /* determine size of argv and environ conversion buffer */
2011         maxlen = wcslen(_wpgmptr);
2012         for (i = 1; i < argc; i++)
2013                 maxlen = max(maxlen, wcslen(wargv[i]));
2014         for (i = 0; wenv[i]; i++)
2015                 maxlen = max(maxlen, wcslen(wenv[i]));
2016
2017         /* nedmalloc can't free CRT memory, allocate resizable environment list */
2018         environ = xcalloc(i + 1, sizeof(char*));
2019
2020         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2021         maxlen = 3 * maxlen + 1;
2022         buffer = xmalloc(maxlen);
2023
2024         /* convert command line arguments and environment to UTF-8 */
2025         len = xwcstoutf(buffer, _wpgmptr, maxlen);
2026         __argv[0] = xmemdupz(buffer, len);
2027         for (i = 1; i < argc; i++) {
2028                 len = xwcstoutf(buffer, wargv[i], maxlen);
2029                 __argv[i] = xmemdupz(buffer, len);
2030         }
2031         for (i = 0; wenv[i]; i++) {
2032                 len = xwcstoutf(buffer, wenv[i], maxlen);
2033                 environ[i] = xmemdupz(buffer, len);
2034         }
2035         free(buffer);
2036
2037         /* initialize critical section for waitpid pinfo_t list */
2038         InitializeCriticalSection(&pinfo_cs);
2039
2040         /* set up default file mode and file modes for stdin/out/err */
2041         _fmode = _O_BINARY;
2042         _setmode(_fileno(stdin), _O_BINARY);
2043         _setmode(_fileno(stdout), _O_BINARY);
2044         _setmode(_fileno(stderr), _O_BINARY);
2045
2046         /* initialize Unicode console */
2047         winansi_init();
2048 }