compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../run-command.h"
   6
   7 static const int delay[] = { 0, 1, 10, 20, 40 };
   8
   9 int err_win_to_posix(DWORD winerr)
  10 {
  11         int error = ENOSYS;
  12         switch(winerr) {
  13         case ERROR_ACCESS_DENIED: error = EACCES; break;
  14         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  15         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  16         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  17         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  18         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  19         case ERROR_BAD_COMMAND: error = EIO; break;
  20         case ERROR_BAD_DEVICE: error = ENODEV; break;
  21         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  22         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  23         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  24         case ERROR_BAD_LENGTH: error = EINVAL; break;
  25         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  26         case ERROR_BAD_PIPE: error = EPIPE; break;
  27         case ERROR_BAD_UNIT: error = ENODEV; break;
  28         case ERROR_BAD_USERNAME: error = EINVAL; break;
  29         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  30         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  31         case ERROR_BUSY: error = EBUSY; break;
  32         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  33         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  34         case ERROR_CANNOT_MAKE: error = EACCES; break;
  35         case ERROR_CANTOPEN: error = EIO; break;
  36         case ERROR_CANTREAD: error = EIO; break;
  37         case ERROR_CANTWRITE: error = EIO; break;
  38         case ERROR_CRC: error = EIO; break;
  39         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  40         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  41         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  42         case ERROR_DIRECTORY: error = EINVAL; break;
  43         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  44         case ERROR_DISK_CHANGE: error = EIO; break;
  45         case ERROR_DISK_FULL: error = ENOSPC; break;
  46         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  47         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  48         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  49         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  50         case ERROR_FILE_EXISTS: error = EEXIST; break;
  51         case ERROR_FILE_INVALID: error = ENODEV; break;
  52         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  53         case ERROR_GEN_FAILURE: error = EIO; break;
  54         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  55         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  56         case ERROR_INVALID_ACCESS: error = EACCES; break;
  57         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  58         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  59         case ERROR_INVALID_DATA: error = EINVAL; break;
  60         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  61         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  62         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  63         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  64         case ERROR_INVALID_HANDLE: error = EBADF; break;
  65         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  66         case ERROR_INVALID_NAME: error = EINVAL; break;
  67         case ERROR_INVALID_OWNER: error = EINVAL; break;
  68         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  69         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  70         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  71         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  72         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  73         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  74         case ERROR_IO_DEVICE: error = EIO; break;
  75         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  76         case ERROR_LOCKED: error = EBUSY; break;
  77         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  78         case ERROR_LOGON_FAILURE: error = EACCES; break;
  79         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  80         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  81         case ERROR_MORE_DATA: error = EPIPE; break;
  82         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  83         case ERROR_NOACCESS: error = EFAULT; break;
  84         case ERROR_NONE_MAPPED: error = EINVAL; break;
  85         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  86         case ERROR_NOT_READY: error = EAGAIN; break;
  87         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  88         case ERROR_NO_DATA: error = EPIPE; break;
  89         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  90         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  91         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  92         case ERROR_OPEN_FAILED: error = EIO; break;
  93         case ERROR_OPEN_FILES: error = EBUSY; break;
  94         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  95         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  96         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  97         case ERROR_PATH_BUSY: error = EBUSY; break;
  98         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  99         case ERROR_PIPE_BUSY: error = EBUSY; break;
 100         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 101         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 102         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 103         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 104         case ERROR_READ_FAULT: error = EIO; break;
 105         case ERROR_SEEK: error = EIO; break;
 106         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 107         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 108         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 109         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 110         case ERROR_SWAPERROR: error = ENOENT; break;
 111         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 112         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 113         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 114         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 115         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 116         case ERROR_WRITE_FAULT: error = EIO; break;
 117         case ERROR_WRITE_PROTECT: error = EROFS; break;
 118         }
 119         return error;
 120 }
 121
 122 static inline int is_file_in_use_error(DWORD errcode)
 123 {
 124         switch (errcode) {
 125         case ERROR_SHARING_VIOLATION:
 126         case ERROR_ACCESS_DENIED:
 127                 return 1;
 128         }
 129
 130         return 0;
 131 }
 132
 133 static int read_yes_no_answer(void)
 134 {
 135         char answer[1024];
 136
 137         if (fgets(answer, sizeof(answer), stdin)) {
 138                 size_t answer_len = strlen(answer);
 139                 int got_full_line = 0, c;
 140
 141                 /* remove the newline */
 142                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 143                         answer[answer_len-2] = '\0';
 144                         got_full_line = 1;
 145                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 146                         answer[answer_len-1] = '\0';
 147                         got_full_line = 1;
 148                 }
 149                 /* flush the buffer in case we did not get the full line */
 150                 if (!got_full_line)
 151                         while ((c = getchar()) != EOF && c != '\n')
 152                                 ;
 153         } else
 154                 /* we could not read, return the
 155                  * default answer which is no */
 156                 return 0;
 157
 158         if (tolower(answer[0]) == 'y' && !answer[1])
 159                 return 1;
 160         if (!strncasecmp(answer, "yes", sizeof(answer)))
 161                 return 1;
 162         if (tolower(answer[0]) == 'n' && !answer[1])
 163                 return 0;
 164         if (!strncasecmp(answer, "no", sizeof(answer)))
 165                 return 0;
 166
 167         /* did not find an answer we understand */
 168         return -1;
 169 }
 170
 171 static int ask_yes_no_if_possible(const char *format, ...)
 172 {
 173         char question[4096];
 174         const char *retry_hook[] = { NULL, NULL, NULL };
 175         va_list args;
 176
 177         va_start(args, format);
 178         vsnprintf(question, sizeof(question), format, args);
 179         va_end(args);
 180
 181         if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 182                 retry_hook[1] = question;
 183                 return !run_command_v_opt(retry_hook, 0);
 184         }
 185
 186         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 187                 return 0;
 188
 189         while (1) {
 190                 int answer;
 191                 fprintf(stderr, "%s (y/n) ", question);
 192
 193                 if ((answer = read_yes_no_answer()) >= 0)
 194                         return answer;
 195
 196                 fprintf(stderr, "Sorry, I did not understand your answer. "
 197                                 "Please type 'y' or 'n'\n");
 198         }
 199 }
 200
 201 #undef unlink
 202 int mingw_unlink(const char *pathname)
 203 {
 204         int ret, tries = 0;
 205
 206         /* read-only files cannot be removed */
 207         chmod(pathname, 0666);
 208         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 209                 if (!is_file_in_use_error(GetLastError()))
 210                         break;
 211                 /*
 212                  * We assume that some other process had the source or
 213                  * destination file open at the wrong moment and retry.
 214                  * In order to give the other process a higher chance to
 215                  * complete its operation, we give up our time slice now.
 216                  * If we have to retry again, we do sleep a bit.
 217                  */
 218                 Sleep(delay[tries]);
 219                 tries++;
 220         }
 221         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 222                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 223                         "Should I try again?", pathname))
 224                ret = unlink(pathname);
 225         return ret;
 226 }
 227
 228 static int is_dir_empty(const char *path)
 229 {
 230         struct strbuf buf = STRBUF_INIT;
 231         WIN32_FIND_DATAA findbuf;
 232         HANDLE handle;
 233
 234         strbuf_addf(&buf, "%s\\*", path);
 235         handle = FindFirstFileA(buf.buf, &findbuf);
 236         if (handle == INVALID_HANDLE_VALUE) {
 237                 strbuf_release(&buf);
 238                 return GetLastError() == ERROR_NO_MORE_FILES;
 239         }
 240
 241         while (!strcmp(findbuf.cFileName, ".") ||
 242                         !strcmp(findbuf.cFileName, ".."))
 243                 if (!FindNextFile(handle, &findbuf)) {
 244                         strbuf_release(&buf);
 245                         return GetLastError() == ERROR_NO_MORE_FILES;
 246                 }
 247         FindClose(handle);
 248         strbuf_release(&buf);
 249         return 0;
 250 }
 251
 252 #undef rmdir
 253 int mingw_rmdir(const char *pathname)
 254 {
 255         int ret, tries = 0;
 256
 257         while ((ret = rmdir(pathname)) == -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(pathname)) {
 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 = rmdir(pathname);
 280         return ret;
 281 }
 282
 283 #undef open
 284 int mingw_open (const char *filename, int oflags, ...)
 285 {
 286         va_list args;
 287         unsigned mode;
 288         int fd;
 289
 290         va_start(args, oflags);
 291         mode = va_arg(args, int);
 292         va_end(args);
 293
 294         if (filename && !strcmp(filename, "/dev/null"))
 295                 filename = "nul";
 296
 297         fd = open(filename, oflags, mode);
 298
 299         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 300                 DWORD attrs = GetFileAttributes(filename);
 301                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 302                         errno = EISDIR;
 303         }
 304         return fd;
 305 }
 306
 307 static BOOL WINAPI ctrl_ignore(DWORD type)
 308 {
 309         return TRUE;
 310 }
 311
 312 #undef fgetc
 313 int mingw_fgetc(FILE *stream)
 314 {
 315         int ch;
 316         if (!isatty(_fileno(stream)))
 317                 return fgetc(stream);
 318
 319         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 320         while (1) {
 321                 ch = fgetc(stream);
 322                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 323                         break;
 324
 325                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 326                 mingw_raise(SIGINT);
 327         }
 328         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 329         return ch;
 330 }
 331
 332 #undef fopen
 333 FILE *mingw_fopen (const char *filename, const char *otype)
 334 {
 335         if (filename && !strcmp(filename, "/dev/null"))
 336                 filename = "nul";
 337         return fopen(filename, otype);
 338 }
 339
 340 #undef freopen
 341 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 342 {
 343         if (filename && !strcmp(filename, "/dev/null"))
 344                 filename = "nul";
 345         return freopen(filename, otype, stream);
 346 }
 347
 348 #undef fflush
 349 int mingw_fflush(FILE *stream)
 350 {
 351         int ret = fflush(stream);
 352
 353         /*
 354          * write() is used behind the scenes of stdio output functions.
 355          * Since git code does not check for errors after each stdio write
 356          * operation, it can happen that write() is called by a later
 357          * stdio function even if an earlier write() call failed. In the
 358          * case of a pipe whose readable end was closed, only the first
 359          * call to write() reports EPIPE on Windows. Subsequent write()
 360          * calls report EINVAL. It is impossible to notice whether this
 361          * fflush invocation triggered such a case, therefore, we have to
 362          * catch all EINVAL errors whole-sale.
 363          */
 364         if (ret && errno == EINVAL)
 365                 errno = EPIPE;
 366
 367         return ret;
 368 }
 369
 370 /*
 371  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 372  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 373  */
 374 static inline long long filetime_to_hnsec(const FILETIME *ft)
 375 {
 376         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 377         /* Windows to Unix Epoch conversion */
 378         return winTime - 116444736000000000LL;
 379 }
 380
 381 static inline time_t filetime_to_time_t(const FILETIME *ft)
 382 {
 383         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 384 }
 385
 386 /* We keep the do_lstat code in a separate function to avoid recursion.
 387  * When a path ends with a slash, the stat will fail with ENOENT. In
 388  * this case, we strip the trailing slashes and stat again.
 389  *
 390  * If follow is true then act like stat() and report on the link
 391  * target. Otherwise report on the link itself.
 392  */
 393 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 394 {
 395         int err;
 396         WIN32_FILE_ATTRIBUTE_DATA fdata;
 397
 398         if (!(err = get_file_attr(file_name, &fdata))) {
 399                 buf->st_ino = 0;
 400                 buf->st_gid = 0;
 401                 buf->st_uid = 0;
 402                 buf->st_nlink = 1;
 403                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 404                 buf->st_size = fdata.nFileSizeLow |
 405                         (((off_t)fdata.nFileSizeHigh)<<32);
 406                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 407                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 408                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 409                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 410                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 411                         WIN32_FIND_DATAA findbuf;
 412                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 413                         if (handle != INVALID_HANDLE_VALUE) {
 414                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 415                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 416                                         if (follow) {
 417                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 418                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 419                                         } else {
 420                                                 buf->st_mode = S_IFLNK;
 421                                         }
 422                                         buf->st_mode |= S_IREAD;
 423                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 424                                                 buf->st_mode |= S_IWRITE;
 425                                 }
 426                                 FindClose(handle);
 427                         }
 428                 }
 429                 return 0;
 430         }
 431         errno = err;
 432         return -1;
 433 }
 434
 435 /* We provide our own lstat/fstat functions, since the provided
 436  * lstat/fstat functions are so slow. These stat functions are
 437  * tailored for Git's usage (read: fast), and are not meant to be
 438  * complete. Note that Git stat()s are redirected to mingw_lstat()
 439  * too, since Windows doesn't really handle symlinks that well.
 440  */
 441 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 442 {
 443         int namelen;
 444         char alt_name[PATH_MAX];
 445
 446         if (!do_lstat(follow, file_name, buf))
 447                 return 0;
 448
 449         /* if file_name ended in a '/', Windows returned ENOENT;
 450          * try again without trailing slashes
 451          */
 452         if (errno != ENOENT)
 453                 return -1;
 454
 455         namelen = strlen(file_name);
 456         if (namelen && file_name[namelen-1] != '/')
 457                 return -1;
 458         while (namelen && file_name[namelen-1] == '/')
 459                 --namelen;
 460         if (!namelen || namelen >= PATH_MAX)
 461                 return -1;
 462
 463         memcpy(alt_name, file_name, namelen);
 464         alt_name[namelen] = 0;
 465         return do_lstat(follow, alt_name, buf);
 466 }
 467
 468 int mingw_lstat(const char *file_name, struct stat *buf)
 469 {
 470         return do_stat_internal(0, file_name, buf);
 471 }
 472 int mingw_stat(const char *file_name, struct stat *buf)
 473 {
 474         return do_stat_internal(1, file_name, buf);
 475 }
 476
 477 int mingw_fstat(int fd, struct stat *buf)
 478 {
 479         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 480         BY_HANDLE_FILE_INFORMATION fdata;
 481
 482         if (fh == INVALID_HANDLE_VALUE) {
 483                 errno = EBADF;
 484                 return -1;
 485         }
 486         /* direct non-file handles to MS's fstat() */
 487         if (GetFileType(fh) != FILE_TYPE_DISK)
 488                 return _fstati64(fd, buf);
 489
 490         if (GetFileInformationByHandle(fh, &fdata)) {
 491                 buf->st_ino = 0;
 492                 buf->st_gid = 0;
 493                 buf->st_uid = 0;
 494                 buf->st_nlink = 1;
 495                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 496                 buf->st_size = fdata.nFileSizeLow |
 497                         (((off_t)fdata.nFileSizeHigh)<<32);
 498                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 499                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 500                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 501                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 502                 return 0;
 503         }
 504         errno = EBADF;
 505         return -1;
 506 }
 507
 508 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 509 {
 510         long long winTime = t * 10000000LL + 116444736000000000LL;
 511         ft->dwLowDateTime = winTime;
 512         ft->dwHighDateTime = winTime >> 32;
 513 }
 514
 515 int mingw_utime (const char *file_name, const struct utimbuf *times)
 516 {
 517         FILETIME mft, aft;
 518         int fh, rc;
 519
 520         /* must have write permission */
 521         DWORD attrs = GetFileAttributes(file_name);
 522         if (attrs != INVALID_FILE_ATTRIBUTES &&
 523             (attrs & FILE_ATTRIBUTE_READONLY)) {
 524                 /* ignore errors here; open() will report them */
 525                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 526         }
 527
 528         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 529                 rc = -1;
 530                 goto revert_attrs;
 531         }
 532
 533         if (times) {
 534                 time_t_to_filetime(times->modtime, &mft);
 535                 time_t_to_filetime(times->actime, &aft);
 536         } else {
 537                 GetSystemTimeAsFileTime(&mft);
 538                 aft = mft;
 539         }
 540         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 541                 errno = EINVAL;
 542                 rc = -1;
 543         } else
 544                 rc = 0;
 545         close(fh);
 546
 547 revert_attrs:
 548         if (attrs != INVALID_FILE_ATTRIBUTES &&
 549             (attrs & FILE_ATTRIBUTE_READONLY)) {
 550                 /* ignore errors again */
 551                 SetFileAttributes(file_name, attrs);
 552         }
 553         return rc;
 554 }
 555
 556 unsigned int sleep (unsigned int seconds)
 557 {
 558         Sleep(seconds*1000);
 559         return 0;
 560 }
 561
 562 int mkstemp(char *template)
 563 {
 564         char *filename = mktemp(template);
 565         if (filename == NULL)
 566                 return -1;
 567         return open(filename, O_RDWR | O_CREAT, 0600);
 568 }
 569
 570 int gettimeofday(struct timeval *tv, void *tz)
 571 {
 572         FILETIME ft;
 573         long long hnsec;
 574
 575         GetSystemTimeAsFileTime(&ft);
 576         hnsec = filetime_to_hnsec(&ft);
 577         tv->tv_sec = hnsec / 10000000;
 578         tv->tv_usec = (hnsec % 10000000) / 10;
 579         return 0;
 580 }
 581
 582 int pipe(int filedes[2])
 583 {
 584         HANDLE h[2];
 585
 586         /* this creates non-inheritable handles */
 587         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 588                 errno = err_win_to_posix(GetLastError());
 589                 return -1;
 590         }
 591         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 592         if (filedes[0] < 0) {
 593                 CloseHandle(h[0]);
 594                 CloseHandle(h[1]);
 595                 return -1;
 596         }
 597         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 598         if (filedes[0] < 0) {
 599                 close(filedes[0]);
 600                 CloseHandle(h[1]);
 601                 return -1;
 602         }
 603         return 0;
 604 }
 605
 606 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 607 {
 608         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 609         memcpy(result, gmtime(timep), sizeof(struct tm));
 610         return result;
 611 }
 612
 613 struct tm *localtime_r(const time_t *timep, struct tm *result)
 614 {
 615         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 616         memcpy(result, localtime(timep), sizeof(struct tm));
 617         return result;
 618 }
 619
 620 #undef getcwd
 621 char *mingw_getcwd(char *pointer, int len)
 622 {
 623         int i;
 624         char *ret = getcwd(pointer, len);
 625         if (!ret)
 626                 return ret;
 627         for (i = 0; pointer[i]; i++)
 628                 if (pointer[i] == '\\')
 629                         pointer[i] = '/';
 630         return ret;
 631 }
 632
 633 /*
 634  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 635  * (Parsing C++ Command-Line Arguments)
 636  */
 637 static const char *quote_arg(const char *arg)
 638 {
 639         /* count chars to quote */
 640         int len = 0, n = 0;
 641         int force_quotes = 0;
 642         char *q, *d;
 643         const char *p = arg;
 644         if (!*p) force_quotes = 1;
 645         while (*p) {
 646                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 647                         force_quotes = 1;
 648                 else if (*p == '"')
 649                         n++;
 650                 else if (*p == '\\') {
 651                         int count = 0;
 652                         while (*p == '\\') {
 653                                 count++;
 654                                 p++;
 655                                 len++;
 656                         }
 657                         if (*p == '"')
 658                                 n += count*2 + 1;
 659                         continue;
 660                 }
 661                 len++;
 662                 p++;
 663         }
 664         if (!force_quotes && n == 0)
 665                 return arg;
 666
 667         /* insert \ where necessary */
 668         d = q = xmalloc(len+n+3);
 669         *d++ = '"';
 670         while (*arg) {
 671                 if (*arg == '"')
 672                         *d++ = '\\';
 673                 else if (*arg == '\\') {
 674                         int count = 0;
 675                         while (*arg == '\\') {
 676                                 count++;
 677                                 *d++ = *arg++;
 678                         }
 679                         if (*arg == '"') {
 680                                 while (count-- > 0)
 681                                         *d++ = '\\';
 682                                 *d++ = '\\';
 683                         }
 684                 }
 685                 *d++ = *arg++;
 686         }
 687         *d++ = '"';
 688         *d++ = 0;
 689         return q;
 690 }
 691
 692 static const char *parse_interpreter(const char *cmd)
 693 {
 694         static char buf[100];
 695         char *p, *opt;
 696         int n, fd;
 697
 698         /* don't even try a .exe */
 699         n = strlen(cmd);
 700         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 701                 return NULL;
 702
 703         fd = open(cmd, O_RDONLY);
 704         if (fd < 0)
 705                 return NULL;
 706         n = read(fd, buf, sizeof(buf)-1);
 707         close(fd);
 708         if (n < 4)      /* at least '#!/x' and not error */
 709                 return NULL;
 710
 711         if (buf[0] != '#' || buf[1] != '!')
 712                 return NULL;
 713         buf[n] = '\0';
 714         p = buf + strcspn(buf, "\r\n");
 715         if (!*p)
 716                 return NULL;
 717
 718         *p = '\0';
 719         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 720                 return NULL;
 721         /* strip options */
 722         if ((opt = strchr(p+1, ' ')))
 723                 *opt = '\0';
 724         return p+1;
 725 }
 726
 727 /*
 728  * Splits the PATH into parts.
 729  */
 730 static char **get_path_split(void)
 731 {
 732         char *p, **path, *envpath = mingw_getenv("PATH");
 733         int i, n = 0;
 734
 735         if (!envpath || !*envpath)
 736                 return NULL;
 737
 738         envpath = xstrdup(envpath);
 739         p = envpath;
 740         while (p) {
 741                 char *dir = p;
 742                 p = strchr(p, ';');
 743                 if (p) *p++ = '\0';
 744                 if (*dir) {     /* not earlier, catches series of ; */
 745                         ++n;
 746                 }
 747         }
 748         if (!n)
 749                 return NULL;
 750
 751         path = xmalloc((n+1)*sizeof(char *));
 752         p = envpath;
 753         i = 0;
 754         do {
 755                 if (*p)
 756                         path[i++] = xstrdup(p);
 757                 p = p+strlen(p)+1;
 758         } while (i < n);
 759         path[i] = NULL;
 760
 761         free(envpath);
 762
 763         return path;
 764 }
 765
 766 static void free_path_split(char **path)
 767 {
 768         char **p = path;
 769
 770         if (!path)
 771                 return;
 772
 773         while (*p)
 774                 free(*p++);
 775         free(path);
 776 }
 777
 778 /*
 779  * exe_only means that we only want to detect .exe files, but not scripts
 780  * (which do not have an extension)
 781  */
 782 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 783 {
 784         char path[MAX_PATH];
 785         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 786
 787         if (!isexe && access(path, F_OK) == 0)
 788                 return xstrdup(path);
 789         path[strlen(path)-4] = '\0';
 790         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 791                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 792                         return xstrdup(path);
 793         return NULL;
 794 }
 795
 796 /*
 797  * Determines the absolute path of cmd using the split path in path.
 798  * If cmd contains a slash or backslash, no lookup is performed.
 799  */
 800 static char *path_lookup(const char *cmd, char **path, int exe_only)
 801 {
 802         char *prog = NULL;
 803         int len = strlen(cmd);
 804         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 805
 806         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 807                 prog = xstrdup(cmd);
 808
 809         while (!prog && *path)
 810                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 811
 812         return prog;
 813 }
 814
 815 static int env_compare(const void *a, const void *b)
 816 {
 817         char *const *ea = a;
 818         char *const *eb = b;
 819         return strcasecmp(*ea, *eb);
 820 }
 821
 822 struct pinfo_t {
 823         struct pinfo_t *next;
 824         pid_t pid;
 825         HANDLE proc;
 826 };
 827 static struct pinfo_t *pinfo = NULL;
 828 CRITICAL_SECTION pinfo_cs;
 829
 830 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 831                               const char *dir,
 832                               int prepend_cmd, int fhin, int fhout, int fherr)
 833 {
 834         STARTUPINFOW si;
 835         PROCESS_INFORMATION pi;
 836         struct strbuf envblk, args;
 837         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs;
 838         unsigned flags;
 839         BOOL ret;
 840
 841         /* Determine whether or not we are associated to a console */
 842         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 843                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 844                         FILE_ATTRIBUTE_NORMAL, NULL);
 845         if (cons == INVALID_HANDLE_VALUE) {
 846                 /* There is no console associated with this process.
 847                  * Since the child is a console process, Windows
 848                  * would normally create a console window. But
 849                  * since we'll be redirecting std streams, we do
 850                  * not need the console.
 851                  * It is necessary to use DETACHED_PROCESS
 852                  * instead of CREATE_NO_WINDOW to make ssh
 853                  * recognize that it has no console.
 854                  */
 855                 flags = DETACHED_PROCESS;
 856         } else {
 857                 /* There is already a console. If we specified
 858                  * DETACHED_PROCESS here, too, Windows would
 859                  * disassociate the child from the console.
 860                  * The same is true for CREATE_NO_WINDOW.
 861                  * Go figure!
 862                  */
 863                 flags = 0;
 864                 CloseHandle(cons);
 865         }
 866         memset(&si, 0, sizeof(si));
 867         si.cb = sizeof(si);
 868         si.dwFlags = STARTF_USESTDHANDLES;
 869         si.hStdInput = winansi_get_osfhandle(fhin);
 870         si.hStdOutput = winansi_get_osfhandle(fhout);
 871         si.hStdError = winansi_get_osfhandle(fherr);
 872
 873         if (xutftowcs_path(wcmd, cmd) < 0)
 874                 return -1;
 875         if (dir && xutftowcs_path(wdir, dir) < 0)
 876                 return -1;
 877
 878         /* concatenate argv, quoting args as we go */
 879         strbuf_init(&args, 0);
 880         if (prepend_cmd) {
 881                 char *quoted = (char *)quote_arg(cmd);
 882                 strbuf_addstr(&args, quoted);
 883                 if (quoted != cmd)
 884                         free(quoted);
 885         }
 886         for (; *argv; argv++) {
 887                 char *quoted = (char *)quote_arg(*argv);
 888                 if (*args.buf)
 889                         strbuf_addch(&args, ' ');
 890                 strbuf_addstr(&args, quoted);
 891                 if (quoted != *argv)
 892                         free(quoted);
 893         }
 894
 895         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
 896         xutftowcs(wargs, args.buf, 2 * args.len + 1);
 897         strbuf_release(&args);
 898
 899         if (env) {
 900                 int count = 0;
 901                 char **e, **sorted_env;
 902
 903                 for (e = env; *e; e++)
 904                         count++;
 905
 906                 /* environment must be sorted */
 907                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 908                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 909                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 910
 911                 strbuf_init(&envblk, 0);
 912                 for (e = sorted_env; *e; e++) {
 913                         strbuf_addstr(&envblk, *e);
 914                         strbuf_addch(&envblk, '\0');
 915                 }
 916                 free(sorted_env);
 917         }
 918
 919         memset(&pi, 0, sizeof(pi));
 920         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
 921                 env ? envblk.buf : NULL, dir ? wdir : NULL, &si, &pi);
 922
 923         if (env)
 924                 strbuf_release(&envblk);
 925         free(wargs);
 926
 927         if (!ret) {
 928                 errno = ENOENT;
 929                 return -1;
 930         }
 931         CloseHandle(pi.hThread);
 932
 933         /*
 934          * The process ID is the human-readable identifier of the process
 935          * that we want to present in log and error messages. The handle
 936          * is not useful for this purpose. But we cannot close it, either,
 937          * because it is not possible to turn a process ID into a process
 938          * handle after the process terminated.
 939          * Keep the handle in a list for waitpid.
 940          */
 941         EnterCriticalSection(&pinfo_cs);
 942         {
 943                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 944                 info->pid = pi.dwProcessId;
 945                 info->proc = pi.hProcess;
 946                 info->next = pinfo;
 947                 pinfo = info;
 948         }
 949         LeaveCriticalSection(&pinfo_cs);
 950
 951         return (pid_t)pi.dwProcessId;
 952 }
 953
 954 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
 955 {
 956         return mingw_spawnve_fd(cmd, argv, environ, NULL, prepend_cmd, 0, 1, 2);
 957 }
 958
 959 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 960                      const char *dir,
 961                      int fhin, int fhout, int fherr)
 962 {
 963         pid_t pid;
 964         char **path = get_path_split();
 965         char *prog = path_lookup(cmd, path, 0);
 966
 967         if (!prog) {
 968                 errno = ENOENT;
 969                 pid = -1;
 970         }
 971         else {
 972                 const char *interpr = parse_interpreter(prog);
 973
 974                 if (interpr) {
 975                         const char *argv0 = argv[0];
 976                         char *iprog = path_lookup(interpr, path, 1);
 977                         argv[0] = prog;
 978                         if (!iprog) {
 979                                 errno = ENOENT;
 980                                 pid = -1;
 981                         }
 982                         else {
 983                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 984                                                        fhin, fhout, fherr);
 985                                 free(iprog);
 986                         }
 987                         argv[0] = argv0;
 988                 }
 989                 else
 990                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 991                                                fhin, fhout, fherr);
 992                 free(prog);
 993         }
 994         free_path_split(path);
 995         return pid;
 996 }
 997
 998 static int try_shell_exec(const char *cmd, char *const *argv)
 999 {
1000         const char *interpr = parse_interpreter(cmd);
1001         char **path;
1002         char *prog;
1003         int pid = 0;
1004
1005         if (!interpr)
1006                 return 0;
1007         path = get_path_split();
1008         prog = path_lookup(interpr, path, 1);
1009         if (prog) {
1010                 int argc = 0;
1011                 const char **argv2;
1012                 while (argv[argc]) argc++;
1013                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1014                 argv2[0] = (char *)cmd; /* full path to the script file */
1015                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1016                 pid = mingw_spawnv(prog, argv2, 1);
1017                 if (pid >= 0) {
1018                         int status;
1019                         if (waitpid(pid, &status, 0) < 0)
1020                                 status = 255;
1021                         exit(status);
1022                 }
1023                 pid = 1;        /* indicate that we tried but failed */
1024                 free(prog);
1025                 free(argv2);
1026         }
1027         free_path_split(path);
1028         return pid;
1029 }
1030
1031 int mingw_execv(const char *cmd, char *const *argv)
1032 {
1033         /* check if git_command is a shell script */
1034         if (!try_shell_exec(cmd, argv)) {
1035                 int pid, status;
1036
1037                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1038                 if (pid < 0)
1039                         return -1;
1040                 if (waitpid(pid, &status, 0) < 0)
1041                         status = 255;
1042                 exit(status);
1043         }
1044         return -1;
1045 }
1046
1047 int mingw_execvp(const char *cmd, char *const *argv)
1048 {
1049         char **path = get_path_split();
1050         char *prog = path_lookup(cmd, path, 0);
1051
1052         if (prog) {
1053                 mingw_execv(prog, argv);
1054                 free(prog);
1055         } else
1056                 errno = ENOENT;
1057
1058         free_path_split(path);
1059         return -1;
1060 }
1061
1062 int mingw_kill(pid_t pid, int sig)
1063 {
1064         if (pid > 0 && sig == SIGTERM) {
1065                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1066
1067                 if (TerminateProcess(h, -1)) {
1068                         CloseHandle(h);
1069                         return 0;
1070                 }
1071
1072                 errno = err_win_to_posix(GetLastError());
1073                 CloseHandle(h);
1074                 return -1;
1075         } else if (pid > 0 && sig == 0) {
1076                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1077                 if (h) {
1078                         CloseHandle(h);
1079                         return 0;
1080                 }
1081         }
1082
1083         errno = EINVAL;
1084         return -1;
1085 }
1086
1087 static char **copy_environ(void)
1088 {
1089         char **env;
1090         int i = 0;
1091         while (environ[i])
1092                 i++;
1093         env = xmalloc((i+1)*sizeof(*env));
1094         for (i = 0; environ[i]; i++)
1095                 env[i] = xstrdup(environ[i]);
1096         env[i] = NULL;
1097         return env;
1098 }
1099
1100 void free_environ(char **env)
1101 {
1102         int i;
1103         for (i = 0; env[i]; i++)
1104                 free(env[i]);
1105         free(env);
1106 }
1107
1108 static int lookup_env(char **env, const char *name, size_t nmln)
1109 {
1110         int i;
1111
1112         for (i = 0; env[i]; i++) {
1113                 if (0 == strncmp(env[i], name, nmln)
1114                     && '=' == env[i][nmln])
1115                         /* matches */
1116                         return i;
1117         }
1118         return -1;
1119 }
1120
1121 /*
1122  * If name contains '=', then sets the variable, otherwise it unsets it
1123  */
1124 static char **env_setenv(char **env, const char *name)
1125 {
1126         char *eq = strchrnul(name, '=');
1127         int i = lookup_env(env, name, eq-name);
1128
1129         if (i < 0) {
1130                 if (*eq) {
1131                         for (i = 0; env[i]; i++)
1132                                 ;
1133                         env = xrealloc(env, (i+2)*sizeof(*env));
1134                         env[i] = xstrdup(name);
1135                         env[i+1] = NULL;
1136                 }
1137         }
1138         else {
1139                 free(env[i]);
1140                 if (*eq)
1141                         env[i] = xstrdup(name);
1142                 else
1143                         for (; env[i]; i++)
1144                                 env[i] = env[i+1];
1145         }
1146         return env;
1147 }
1148
1149 /*
1150  * Copies global environ and adjusts variables as specified by vars.
1151  */
1152 char **make_augmented_environ(const char *const *vars)
1153 {
1154         char **env = copy_environ();
1155
1156         while (*vars)
1157                 env = env_setenv(env, *vars++);
1158         return env;
1159 }
1160
1161 #undef getenv
1162
1163 /*
1164  * The system's getenv looks up the name in a case-insensitive manner.
1165  * This version tries a case-sensitive lookup and falls back to
1166  * case-insensitive if nothing was found.  This is necessary because,
1167  * as a prominent example, CMD sets 'Path', but not 'PATH'.
1168  * Warning: not thread-safe.
1169  */
1170 static char *getenv_cs(const char *name)
1171 {
1172         size_t len = strlen(name);
1173         int i = lookup_env(environ, name, len);
1174         if (i >= 0)
1175                 return environ[i] + len + 1;    /* skip past name and '=' */
1176         return getenv(name);
1177 }
1178
1179 char *mingw_getenv(const char *name)
1180 {
1181         char *result = getenv_cs(name);
1182         if (!result && !strcmp(name, "TMPDIR")) {
1183                 /* on Windows it is TMP and TEMP */
1184                 result = getenv_cs("TMP");
1185                 if (!result)
1186                         result = getenv_cs("TEMP");
1187         }
1188         return result;
1189 }
1190
1191 /*
1192  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1193  * that service contains a numerical port, or that it is null. It
1194  * does a simple search using gethostbyname, and returns one IPv4 host
1195  * if one was found.
1196  */
1197 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1198                                    const struct addrinfo *hints,
1199                                    struct addrinfo **res)
1200 {
1201         struct hostent *h = NULL;
1202         struct addrinfo *ai;
1203         struct sockaddr_in *sin;
1204
1205         if (node) {
1206                 h = gethostbyname(node);
1207                 if (!h)
1208                         return WSAGetLastError();
1209         }
1210
1211         ai = xmalloc(sizeof(struct addrinfo));
1212         *res = ai;
1213         ai->ai_flags = 0;
1214         ai->ai_family = AF_INET;
1215         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1216         switch (ai->ai_socktype) {
1217         case SOCK_STREAM:
1218                 ai->ai_protocol = IPPROTO_TCP;
1219                 break;
1220         case SOCK_DGRAM:
1221                 ai->ai_protocol = IPPROTO_UDP;
1222                 break;
1223         default:
1224                 ai->ai_protocol = 0;
1225                 break;
1226         }
1227         ai->ai_addrlen = sizeof(struct sockaddr_in);
1228         if (hints && (hints->ai_flags & AI_CANONNAME))
1229                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1230         else
1231                 ai->ai_canonname = NULL;
1232
1233         sin = xmalloc(ai->ai_addrlen);
1234         memset(sin, 0, ai->ai_addrlen);
1235         sin->sin_family = AF_INET;
1236         /* Note: getaddrinfo is supposed to allow service to be a string,
1237          * which should be looked up using getservbyname. This is
1238          * currently not implemented */
1239         if (service)
1240                 sin->sin_port = htons(atoi(service));
1241         if (h)
1242                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1243         else if (hints && (hints->ai_flags & AI_PASSIVE))
1244                 sin->sin_addr.s_addr = INADDR_ANY;
1245         else
1246                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1247         ai->ai_addr = (struct sockaddr *)sin;
1248         ai->ai_next = NULL;
1249         return 0;
1250 }
1251
1252 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1253 {
1254         free(res->ai_canonname);
1255         free(res->ai_addr);
1256         free(res);
1257 }
1258
1259 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1260                                    char *host, DWORD hostlen,
1261                                    char *serv, DWORD servlen, int flags)
1262 {
1263         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1264         if (sa->sa_family != AF_INET)
1265                 return EAI_FAMILY;
1266         if (!host && !serv)
1267                 return EAI_NONAME;
1268
1269         if (host && hostlen > 0) {
1270                 struct hostent *ent = NULL;
1271                 if (!(flags & NI_NUMERICHOST))
1272                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1273                                             sizeof(sin->sin_addr), AF_INET);
1274
1275                 if (ent)
1276                         snprintf(host, hostlen, "%s", ent->h_name);
1277                 else if (flags & NI_NAMEREQD)
1278                         return EAI_NONAME;
1279                 else
1280                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1281         }
1282
1283         if (serv && servlen > 0) {
1284                 struct servent *ent = NULL;
1285                 if (!(flags & NI_NUMERICSERV))
1286                         ent = getservbyport(sin->sin_port,
1287                                             flags & NI_DGRAM ? "udp" : "tcp");
1288
1289                 if (ent)
1290                         snprintf(serv, servlen, "%s", ent->s_name);
1291                 else
1292                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1293         }
1294
1295         return 0;
1296 }
1297
1298 static HMODULE ipv6_dll = NULL;
1299 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1300 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1301                                       const struct addrinfo *hints,
1302                                       struct addrinfo **res);
1303 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1304                                       char *host, DWORD hostlen,
1305                                       char *serv, DWORD servlen, int flags);
1306 /*
1307  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1308  * don't need to try to load that one dynamically.
1309  */
1310
1311 static void socket_cleanup(void)
1312 {
1313         WSACleanup();
1314         if (ipv6_dll)
1315                 FreeLibrary(ipv6_dll);
1316         ipv6_dll = NULL;
1317         ipv6_freeaddrinfo = freeaddrinfo_stub;
1318         ipv6_getaddrinfo = getaddrinfo_stub;
1319         ipv6_getnameinfo = getnameinfo_stub;
1320 }
1321
1322 static void ensure_socket_initialization(void)
1323 {
1324         WSADATA wsa;
1325         static int initialized = 0;
1326         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1327         const char **name;
1328
1329         if (initialized)
1330                 return;
1331
1332         if (WSAStartup(MAKEWORD(2,2), &wsa))
1333                 die("unable to initialize winsock subsystem, error %d",
1334                         WSAGetLastError());
1335
1336         for (name = libraries; *name; name++) {
1337                 ipv6_dll = LoadLibrary(*name);
1338                 if (!ipv6_dll)
1339                         continue;
1340
1341                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1342                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1343                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1344                                                    const struct addrinfo *,
1345                                                    struct addrinfo **))
1346                         GetProcAddress(ipv6_dll, "getaddrinfo");
1347                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1348                                                    socklen_t, char *, DWORD,
1349                                                    char *, DWORD, int))
1350                         GetProcAddress(ipv6_dll, "getnameinfo");
1351                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1352                         FreeLibrary(ipv6_dll);
1353                         ipv6_dll = NULL;
1354                 } else
1355                         break;
1356         }
1357         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1358                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1359                 ipv6_getaddrinfo = getaddrinfo_stub;
1360                 ipv6_getnameinfo = getnameinfo_stub;
1361         }
1362
1363         atexit(socket_cleanup);
1364         initialized = 1;
1365 }
1366
1367 #undef gethostname
1368 int mingw_gethostname(char *name, int namelen)
1369 {
1370     ensure_socket_initialization();
1371     return gethostname(name, namelen);
1372 }
1373
1374 #undef gethostbyname
1375 struct hostent *mingw_gethostbyname(const char *host)
1376 {
1377         ensure_socket_initialization();
1378         return gethostbyname(host);
1379 }
1380
1381 void mingw_freeaddrinfo(struct addrinfo *res)
1382 {
1383         ipv6_freeaddrinfo(res);
1384 }
1385
1386 int mingw_getaddrinfo(const char *node, const char *service,
1387                       const struct addrinfo *hints, struct addrinfo **res)
1388 {
1389         ensure_socket_initialization();
1390         return ipv6_getaddrinfo(node, service, hints, res);
1391 }
1392
1393 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1394                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1395                       int flags)
1396 {
1397         ensure_socket_initialization();
1398         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1399 }
1400
1401 int mingw_socket(int domain, int type, int protocol)
1402 {
1403         int sockfd;
1404         SOCKET s;
1405
1406         ensure_socket_initialization();
1407         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1408         if (s == INVALID_SOCKET) {
1409                 /*
1410                  * WSAGetLastError() values are regular BSD error codes
1411                  * biased by WSABASEERR.
1412                  * However, strerror() does not know about networking
1413                  * specific errors, which are values beginning at 38 or so.
1414                  * Therefore, we choose to leave the biased error code
1415                  * in errno so that _if_ someone looks up the code somewhere,
1416                  * then it is at least the number that are usually listed.
1417                  */
1418                 errno = WSAGetLastError();
1419                 return -1;
1420         }
1421         /* convert into a file descriptor */
1422         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1423                 closesocket(s);
1424                 return error("unable to make a socket file descriptor: %s",
1425                         strerror(errno));
1426         }
1427         return sockfd;
1428 }
1429
1430 #undef connect
1431 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1432 {
1433         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1434         return connect(s, sa, sz);
1435 }
1436
1437 #undef bind
1438 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1439 {
1440         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1441         return bind(s, sa, sz);
1442 }
1443
1444 #undef setsockopt
1445 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1446 {
1447         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1448         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1449 }
1450
1451 #undef shutdown
1452 int mingw_shutdown(int sockfd, int how)
1453 {
1454         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1455         return shutdown(s, how);
1456 }
1457
1458 #undef listen
1459 int mingw_listen(int sockfd, int backlog)
1460 {
1461         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1462         return listen(s, backlog);
1463 }
1464
1465 #undef accept
1466 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1467 {
1468         int sockfd2;
1469
1470         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1471         SOCKET s2 = accept(s1, sa, sz);
1472
1473         /* convert into a file descriptor */
1474         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1475                 int err = errno;
1476                 closesocket(s2);
1477                 return error("unable to make a socket file descriptor: %s",
1478                         strerror(err));
1479         }
1480         return sockfd2;
1481 }
1482
1483 #undef rename
1484 int mingw_rename(const char *pold, const char *pnew)
1485 {
1486         DWORD attrs, gle;
1487         int tries = 0;
1488
1489         /*
1490          * Try native rename() first to get errno right.
1491          * It is based on MoveFile(), which cannot overwrite existing files.
1492          */
1493         if (!rename(pold, pnew))
1494                 return 0;
1495         if (errno != EEXIST)
1496                 return -1;
1497 repeat:
1498         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1499                 return 0;
1500         /* TODO: translate more errors */
1501         gle = GetLastError();
1502         if (gle == ERROR_ACCESS_DENIED &&
1503             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1504                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1505                         errno = EISDIR;
1506                         return -1;
1507                 }
1508                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1509                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1510                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1511                                 return 0;
1512                         gle = GetLastError();
1513                         /* revert file attributes on failure */
1514                         SetFileAttributes(pnew, attrs);
1515                 }
1516         }
1517         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1518                 /*
1519                  * We assume that some other process had the source or
1520                  * destination file open at the wrong moment and retry.
1521                  * In order to give the other process a higher chance to
1522                  * complete its operation, we give up our time slice now.
1523                  * If we have to retry again, we do sleep a bit.
1524                  */
1525                 Sleep(delay[tries]);
1526                 tries++;
1527                 goto repeat;
1528         }
1529         if (gle == ERROR_ACCESS_DENIED &&
1530                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1531                        "Should I try again?", pold, pnew))
1532                 goto repeat;
1533
1534         errno = EACCES;
1535         return -1;
1536 }
1537
1538 /*
1539  * Note that this doesn't return the actual pagesize, but
1540  * the allocation granularity. If future Windows specific git code
1541  * needs the real getpagesize function, we need to find another solution.
1542  */
1543 int mingw_getpagesize(void)
1544 {
1545         SYSTEM_INFO si;
1546         GetSystemInfo(&si);
1547         return si.dwAllocationGranularity;
1548 }
1549
1550 struct passwd *getpwuid(int uid)
1551 {
1552         static char user_name[100];
1553         static struct passwd p;
1554
1555         DWORD len = sizeof(user_name);
1556         if (!GetUserName(user_name, &len))
1557                 return NULL;
1558         p.pw_name = user_name;
1559         p.pw_gecos = "unknown";
1560         p.pw_dir = NULL;
1561         return &p;
1562 }
1563
1564 static HANDLE timer_event;
1565 static HANDLE timer_thread;
1566 static int timer_interval;
1567 static int one_shot;
1568 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1569
1570 /* The timer works like this:
1571  * The thread, ticktack(), is a trivial routine that most of the time
1572  * only waits to receive the signal to terminate. The main thread tells
1573  * the thread to terminate by setting the timer_event to the signalled
1574  * state.
1575  * But ticktack() interrupts the wait state after the timer's interval
1576  * length to call the signal handler.
1577  */
1578
1579 static unsigned __stdcall ticktack(void *dummy)
1580 {
1581         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1582                 mingw_raise(SIGALRM);
1583                 if (one_shot)
1584                         break;
1585         }
1586         return 0;
1587 }
1588
1589 static int start_timer_thread(void)
1590 {
1591         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1592         if (timer_event) {
1593                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1594                 if (!timer_thread )
1595                         return errno = ENOMEM,
1596                                 error("cannot start timer thread");
1597         } else
1598                 return errno = ENOMEM,
1599                         error("cannot allocate resources for timer");
1600         return 0;
1601 }
1602
1603 static void stop_timer_thread(void)
1604 {
1605         if (timer_event)
1606                 SetEvent(timer_event);  /* tell thread to terminate */
1607         if (timer_thread) {
1608                 int rc = WaitForSingleObject(timer_thread, 1000);
1609                 if (rc == WAIT_TIMEOUT)
1610                         error("timer thread did not terminate timely");
1611                 else if (rc != WAIT_OBJECT_0)
1612                         error("waiting for timer thread failed: %lu",
1613                               GetLastError());
1614                 CloseHandle(timer_thread);
1615         }
1616         if (timer_event)
1617                 CloseHandle(timer_event);
1618         timer_event = NULL;
1619         timer_thread = NULL;
1620 }
1621
1622 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1623 {
1624         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1625 }
1626
1627 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1628 {
1629         static const struct timeval zero;
1630         static int atexit_done;
1631
1632         if (out != NULL)
1633                 return errno = EINVAL,
1634                         error("setitimer param 3 != NULL not implemented");
1635         if (!is_timeval_eq(&in->it_interval, &zero) &&
1636             !is_timeval_eq(&in->it_interval, &in->it_value))
1637                 return errno = EINVAL,
1638                         error("setitimer: it_interval must be zero or eq it_value");
1639
1640         if (timer_thread)
1641                 stop_timer_thread();
1642
1643         if (is_timeval_eq(&in->it_value, &zero) &&
1644             is_timeval_eq(&in->it_interval, &zero))
1645                 return 0;
1646
1647         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1648         one_shot = is_timeval_eq(&in->it_interval, &zero);
1649         if (!atexit_done) {
1650                 atexit(stop_timer_thread);
1651                 atexit_done = 1;
1652         }
1653         return start_timer_thread();
1654 }
1655
1656 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1657 {
1658         if (sig != SIGALRM)
1659                 return errno = EINVAL,
1660                         error("sigaction only implemented for SIGALRM");
1661         if (out != NULL)
1662                 return errno = EINVAL,
1663                         error("sigaction: param 3 != NULL not implemented");
1664
1665         timer_fn = in->sa_handler;
1666         return 0;
1667 }
1668
1669 #undef signal
1670 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1671 {
1672         sig_handler_t old;
1673
1674         switch (sig) {
1675         case SIGALRM:
1676                 old = timer_fn;
1677                 timer_fn = handler;
1678                 break;
1679
1680         case SIGINT:
1681                 old = sigint_fn;
1682                 sigint_fn = handler;
1683                 break;
1684
1685         default:
1686                 return signal(sig, handler);
1687         }
1688
1689         return old;
1690 }
1691
1692 #undef raise
1693 int mingw_raise(int sig)
1694 {
1695         switch (sig) {
1696         case SIGALRM:
1697                 if (timer_fn == SIG_DFL) {
1698                         if (isatty(STDERR_FILENO))
1699                                 fputs("Alarm clock\n", stderr);
1700                         exit(128 + SIGALRM);
1701                 } else if (timer_fn != SIG_IGN)
1702                         timer_fn(SIGALRM);
1703                 return 0;
1704
1705         case SIGINT:
1706                 if (sigint_fn == SIG_DFL)
1707                         exit(128 + SIGINT);
1708                 else if (sigint_fn != SIG_IGN)
1709                         sigint_fn(SIGINT);
1710                 return 0;
1711
1712         default:
1713                 return raise(sig);
1714         }
1715 }
1716
1717
1718 static const char *make_backslash_path(const char *path)
1719 {
1720         static char buf[PATH_MAX + 1];
1721         char *c;
1722
1723         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1724                 die("Too long path: %.*s", 60, path);
1725
1726         for (c = buf; *c; c++) {
1727                 if (*c == '/')
1728                         *c = '\\';
1729         }
1730         return buf;
1731 }
1732
1733 void mingw_open_html(const char *unixpath)
1734 {
1735         const char *htmlpath = make_backslash_path(unixpath);
1736         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1737                         const char *, const char *, const char *, INT);
1738         T ShellExecute;
1739         HMODULE shell32;
1740         int r;
1741
1742         shell32 = LoadLibrary("shell32.dll");
1743         if (!shell32)
1744                 die("cannot load shell32.dll");
1745         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1746         if (!ShellExecute)
1747                 die("cannot run browser");
1748
1749         printf("Launching default browser to display HTML ...\n");
1750         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1751         FreeLibrary(shell32);
1752         /* see the MSDN documentation referring to the result codes here */
1753         if (r <= 32) {
1754                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1755         }
1756 }
1757
1758 int link(const char *oldpath, const char *newpath)
1759 {
1760         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1761         static T create_hard_link = NULL;
1762         if (!create_hard_link) {
1763                 create_hard_link = (T) GetProcAddress(
1764                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1765                 if (!create_hard_link)
1766                         create_hard_link = (T)-1;
1767         }
1768         if (create_hard_link == (T)-1) {
1769                 errno = ENOSYS;
1770                 return -1;
1771         }
1772         if (!create_hard_link(newpath, oldpath, NULL)) {
1773                 errno = err_win_to_posix(GetLastError());
1774                 return -1;
1775         }
1776         return 0;
1777 }
1778
1779 pid_t waitpid(pid_t pid, int *status, int options)
1780 {
1781         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1782             FALSE, pid);
1783         if (!h) {
1784                 errno = ECHILD;
1785                 return -1;
1786         }
1787
1788         if (pid > 0 && options & WNOHANG) {
1789                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1790                         CloseHandle(h);
1791                         return 0;
1792                 }
1793                 options &= ~WNOHANG;
1794         }
1795
1796         if (options == 0) {
1797                 struct pinfo_t **ppinfo;
1798                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1799                         CloseHandle(h);
1800                         return 0;
1801                 }
1802
1803                 if (status)
1804                         GetExitCodeProcess(h, (LPDWORD)status);
1805
1806                 EnterCriticalSection(&pinfo_cs);
1807
1808                 ppinfo = &pinfo;
1809                 while (*ppinfo) {
1810                         struct pinfo_t *info = *ppinfo;
1811                         if (info->pid == pid) {
1812                                 CloseHandle(info->proc);
1813                                 *ppinfo = info->next;
1814                                 free(info);
1815                                 break;
1816                         }
1817                         ppinfo = &info->next;
1818                 }
1819
1820                 LeaveCriticalSection(&pinfo_cs);
1821
1822                 CloseHandle(h);
1823                 return pid;
1824         }
1825         CloseHandle(h);
1826
1827         errno = EINVAL;
1828         return -1;
1829 }
1830
1831 int mingw_offset_1st_component(const char *path)
1832 {
1833         int offset = 0;
1834         if (has_dos_drive_prefix(path))
1835                 offset = 2;
1836
1837         /* unc paths */
1838         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1839
1840                 /* skip server name */
1841                 char *pos = strpbrk(path + 2, "\\/");
1842                 if (!pos)
1843                         return 0; /* Error: malformed unc path */
1844
1845                 do {
1846                         pos++;
1847                 } while (*pos && !is_dir_sep(*pos));
1848
1849                 offset = pos - path;
1850         }
1851
1852         return offset + is_dir_sep(path[offset]);
1853 }
1854
1855 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1856 {
1857         int upos = 0, wpos = 0;
1858         const unsigned char *utf = (const unsigned char*) utfs;
1859         if (!utf || !wcs || wcslen < 1) {
1860                 errno = EINVAL;
1861                 return -1;
1862         }
1863         /* reserve space for \0 */
1864         wcslen--;
1865         if (utflen < 0)
1866                 utflen = INT_MAX;
1867
1868         while (upos < utflen) {
1869                 int c = utf[upos++] & 0xff;
1870                 if (utflen == INT_MAX && c == 0)
1871                         break;
1872
1873                 if (wpos >= wcslen) {
1874                         wcs[wpos] = 0;
1875                         errno = ERANGE;
1876                         return -1;
1877                 }
1878
1879                 if (c < 0x80) {
1880                         /* ASCII */
1881                         wcs[wpos++] = c;
1882                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1883                                 (utf[upos] & 0xc0) == 0x80) {
1884                         /* 2-byte utf-8 */
1885                         c = ((c & 0x1f) << 6);
1886                         c |= (utf[upos++] & 0x3f);
1887                         wcs[wpos++] = c;
1888                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1889                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1890                                 (utf[upos] & 0xc0) == 0x80 &&
1891                                 (utf[upos + 1] & 0xc0) == 0x80) {
1892                         /* 3-byte utf-8 */
1893                         c = ((c & 0x0f) << 12);
1894                         c |= ((utf[upos++] & 0x3f) << 6);
1895                         c |= (utf[upos++] & 0x3f);
1896                         wcs[wpos++] = c;
1897                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
1898                                 wpos + 1 < wcslen &&
1899                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
1900                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
1901                                 (utf[upos] & 0xc0) == 0x80 &&
1902                                 (utf[upos + 1] & 0xc0) == 0x80 &&
1903                                 (utf[upos + 2] & 0xc0) == 0x80) {
1904                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
1905                         c = ((c & 0x07) << 18);
1906                         c |= ((utf[upos++] & 0x3f) << 12);
1907                         c |= ((utf[upos++] & 0x3f) << 6);
1908                         c |= (utf[upos++] & 0x3f);
1909                         c -= 0x10000;
1910                         wcs[wpos++] = 0xd800 | (c >> 10);
1911                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
1912                 } else if (c >= 0xa0) {
1913                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
1914                         wcs[wpos++] = c;
1915                 } else {
1916                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
1917                         static const char *hex = "0123456789abcdef";
1918                         wcs[wpos++] = hex[c >> 4];
1919                         if (wpos < wcslen)
1920                                 wcs[wpos++] = hex[c & 0x0f];
1921                 }
1922         }
1923         wcs[wpos] = 0;
1924         return wpos;
1925 }
1926
1927 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
1928 {
1929         if (!wcs || !utf || utflen < 1) {
1930                 errno = EINVAL;
1931                 return -1;
1932         }
1933         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
1934         if (utflen)
1935                 return utflen - 1;
1936         errno = ERANGE;
1937         return -1;
1938 }
1939
1940 /*
1941  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
1942  * mingw startup code, see init.c in mingw runtime).
1943  */
1944 int _CRT_glob = 0;
1945
1946 typedef struct {
1947         int newmode;
1948 } _startupinfo;
1949
1950 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
1951                 _startupinfo *si);
1952
1953 static NORETURN void die_startup()
1954 {
1955         fputs("fatal: not enough memory for initialization", stderr);
1956         exit(128);
1957 }
1958
1959 void mingw_startup()
1960 {
1961         int i, len, maxlen, argc;
1962         char *buffer;
1963         wchar_t **wenv, **wargv;
1964         _startupinfo si;
1965
1966         /* get wide char arguments and environment */
1967         si.newmode = 0;
1968         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
1969                 die_startup();
1970
1971         /* determine size of argv and environ conversion buffer */
1972         maxlen = wcslen(_wpgmptr);
1973         for (i = 1; i < argc; i++)
1974                 maxlen = max(maxlen, wcslen(wargv[i]));
1975
1976         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
1977         maxlen = 3 * maxlen + 1;
1978         buffer = xmalloc(maxlen);
1979
1980         /* convert command line arguments and environment to UTF-8 */
1981         len = xwcstoutf(buffer, _wpgmptr, maxlen);
1982         __argv[0] = xmemdupz(buffer, len);
1983         for (i = 1; i < argc; i++) {
1984                 len = xwcstoutf(buffer, wargv[i], maxlen);
1985                 __argv[i] = xmemdupz(buffer, len);
1986         }
1987         free(buffer);
1988
1989         /* initialize critical section for waitpid pinfo_t list */
1990         InitializeCriticalSection(&pinfo_cs);
1991
1992         /* set up default file mode and file modes for stdin/out/err */
1993         _fmode = _O_BINARY;
1994         _setmode(_fileno(stdin), _O_BINARY);
1995         _setmode(_fileno(stdout), _O_BINARY);
1996         _setmode(_fileno(stderr), _O_BINARY);
1997
1998         /* initialize Unicode console */
1999         winansi_init();
2000 }