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                         DWORD err = GetLastError();
 246                         FindClose(handle);
 247                         return err == ERROR_NO_MORE_FILES;
 248                 }
 249         FindClose(handle);
 250         return 0;
 251 }
 252
 253 int mingw_rmdir(const char *pathname)
 254 {
 255         int ret, tries = 0;
 256         wchar_t wpathname[MAX_PATH];
 257         if (xutftowcs_path(wpathname, pathname) < 0)
 258                 return -1;
 259
 260         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 261                 if (!is_file_in_use_error(GetLastError()))
 262                         errno = err_win_to_posix(GetLastError());
 263                 if (errno != EACCES)
 264                         break;
 265                 if (!is_dir_empty(wpathname)) {
 266                         errno = ENOTEMPTY;
 267                         break;
 268                 }
 269                 /*
 270                  * We assume that some other process had the source or
 271                  * destination file open at the wrong moment and retry.
 272                  * In order to give the other process a higher chance to
 273                  * complete its operation, we give up our time slice now.
 274                  * If we have to retry again, we do sleep a bit.
 275                  */
 276                 Sleep(delay[tries]);
 277                 tries++;
 278         }
 279         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 280                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 281                         "Should I try again?", pathname))
 282                ret = _wrmdir(wpathname);
 283         return ret;
 284 }
 285
 286 int mingw_mkdir(const char *path, int mode)
 287 {
 288         int ret;
 289         wchar_t wpath[MAX_PATH];
 290         if (xutftowcs_path(wpath, path) < 0)
 291                 return -1;
 292         ret = _wmkdir(wpath);
 293         return ret;
 294 }
 295
 296 int mingw_open (const char *filename, int oflags, ...)
 297 {
 298         va_list args;
 299         unsigned mode;
 300         int fd;
 301         wchar_t wfilename[MAX_PATH];
 302
 303         va_start(args, oflags);
 304         mode = va_arg(args, int);
 305         va_end(args);
 306
 307         if (filename && !strcmp(filename, "/dev/null"))
 308                 filename = "nul";
 309
 310         if (xutftowcs_path(wfilename, filename) < 0)
 311                 return -1;
 312         fd = _wopen(wfilename, oflags, mode);
 313
 314         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 315                 DWORD attrs = GetFileAttributesW(wfilename);
 316                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 317                         errno = EISDIR;
 318         }
 319         return fd;
 320 }
 321
 322 static BOOL WINAPI ctrl_ignore(DWORD type)
 323 {
 324         return TRUE;
 325 }
 326
 327 #undef fgetc
 328 int mingw_fgetc(FILE *stream)
 329 {
 330         int ch;
 331         if (!isatty(_fileno(stream)))
 332                 return fgetc(stream);
 333
 334         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 335         while (1) {
 336                 ch = fgetc(stream);
 337                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 338                         break;
 339
 340                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 341                 mingw_raise(SIGINT);
 342         }
 343         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 344         return ch;
 345 }
 346
 347 #undef fopen
 348 FILE *mingw_fopen (const char *filename, const char *otype)
 349 {
 350         FILE *file;
 351         wchar_t wfilename[MAX_PATH], wotype[4];
 352         if (filename && !strcmp(filename, "/dev/null"))
 353                 filename = "nul";
 354         if (xutftowcs_path(wfilename, filename) < 0 ||
 355                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 356                 return NULL;
 357         file = _wfopen(wfilename, wotype);
 358         return file;
 359 }
 360
 361 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 362 {
 363         FILE *file;
 364         wchar_t wfilename[MAX_PATH], wotype[4];
 365         if (filename && !strcmp(filename, "/dev/null"))
 366                 filename = "nul";
 367         if (xutftowcs_path(wfilename, filename) < 0 ||
 368                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 369                 return NULL;
 370         file = _wfreopen(wfilename, wotype, stream);
 371         return file;
 372 }
 373
 374 #undef fflush
 375 int mingw_fflush(FILE *stream)
 376 {
 377         int ret = fflush(stream);
 378
 379         /*
 380          * write() is used behind the scenes of stdio output functions.
 381          * Since git code does not check for errors after each stdio write
 382          * operation, it can happen that write() is called by a later
 383          * stdio function even if an earlier write() call failed. In the
 384          * case of a pipe whose readable end was closed, only the first
 385          * call to write() reports EPIPE on Windows. Subsequent write()
 386          * calls report EINVAL. It is impossible to notice whether this
 387          * fflush invocation triggered such a case, therefore, we have to
 388          * catch all EINVAL errors whole-sale.
 389          */
 390         if (ret && errno == EINVAL)
 391                 errno = EPIPE;
 392
 393         return ret;
 394 }
 395
 396 int mingw_access(const char *filename, int mode)
 397 {
 398         wchar_t wfilename[MAX_PATH];
 399         if (xutftowcs_path(wfilename, filename) < 0)
 400                 return -1;
 401         /* X_OK is not supported by the MSVCRT version */
 402         return _waccess(wfilename, mode & ~X_OK);
 403 }
 404
 405 int mingw_chdir(const char *dirname)
 406 {
 407         wchar_t wdirname[MAX_PATH];
 408         if (xutftowcs_path(wdirname, dirname) < 0)
 409                 return -1;
 410         return _wchdir(wdirname);
 411 }
 412
 413 int mingw_chmod(const char *filename, int mode)
 414 {
 415         wchar_t wfilename[MAX_PATH];
 416         if (xutftowcs_path(wfilename, filename) < 0)
 417                 return -1;
 418         return _wchmod(wfilename, mode);
 419 }
 420
 421 /* We keep the do_lstat code in a separate function to avoid recursion.
 422  * When a path ends with a slash, the stat will fail with ENOENT. In
 423  * this case, we strip the trailing slashes and stat again.
 424  *
 425  * If follow is true then act like stat() and report on the link
 426  * target. Otherwise report on the link itself.
 427  */
 428 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 429 {
 430         WIN32_FILE_ATTRIBUTE_DATA fdata;
 431         wchar_t wfilename[MAX_PATH];
 432         if (xutftowcs_path(wfilename, file_name) < 0)
 433                 return -1;
 434
 435         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 436                 buf->st_ino = 0;
 437                 buf->st_gid = 0;
 438                 buf->st_uid = 0;
 439                 buf->st_nlink = 1;
 440                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 441                 buf->st_size = fdata.nFileSizeLow |
 442                         (((off_t)fdata.nFileSizeHigh)<<32);
 443                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 444                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 445                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 446                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 447                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 448                         WIN32_FIND_DATAW findbuf;
 449                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 450                         if (handle != INVALID_HANDLE_VALUE) {
 451                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 452                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 453                                         if (follow) {
 454                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 455                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 456                                         } else {
 457                                                 buf->st_mode = S_IFLNK;
 458                                         }
 459                                         buf->st_mode |= S_IREAD;
 460                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 461                                                 buf->st_mode |= S_IWRITE;
 462                                 }
 463                                 FindClose(handle);
 464                         }
 465                 }
 466                 return 0;
 467         }
 468         switch (GetLastError()) {
 469         case ERROR_ACCESS_DENIED:
 470         case ERROR_SHARING_VIOLATION:
 471         case ERROR_LOCK_VIOLATION:
 472         case ERROR_SHARING_BUFFER_EXCEEDED:
 473                 errno = EACCES;
 474                 break;
 475         case ERROR_BUFFER_OVERFLOW:
 476                 errno = ENAMETOOLONG;
 477                 break;
 478         case ERROR_NOT_ENOUGH_MEMORY:
 479                 errno = ENOMEM;
 480                 break;
 481         default:
 482                 errno = ENOENT;
 483                 break;
 484         }
 485         return -1;
 486 }
 487
 488 /* We provide our own lstat/fstat functions, since the provided
 489  * lstat/fstat functions are so slow. These stat functions are
 490  * tailored for Git's usage (read: fast), and are not meant to be
 491  * complete. Note that Git stat()s are redirected to mingw_lstat()
 492  * too, since Windows doesn't really handle symlinks that well.
 493  */
 494 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 495 {
 496         int namelen;
 497         char alt_name[PATH_MAX];
 498
 499         if (!do_lstat(follow, file_name, buf))
 500                 return 0;
 501
 502         /* if file_name ended in a '/', Windows returned ENOENT;
 503          * try again without trailing slashes
 504          */
 505         if (errno != ENOENT)
 506                 return -1;
 507
 508         namelen = strlen(file_name);
 509         if (namelen && file_name[namelen-1] != '/')
 510                 return -1;
 511         while (namelen && file_name[namelen-1] == '/')
 512                 --namelen;
 513         if (!namelen || namelen >= PATH_MAX)
 514                 return -1;
 515
 516         memcpy(alt_name, file_name, namelen);
 517         alt_name[namelen] = 0;
 518         return do_lstat(follow, alt_name, buf);
 519 }
 520
 521 int mingw_lstat(const char *file_name, struct stat *buf)
 522 {
 523         return do_stat_internal(0, file_name, buf);
 524 }
 525 int mingw_stat(const char *file_name, struct stat *buf)
 526 {
 527         return do_stat_internal(1, file_name, buf);
 528 }
 529
 530 int mingw_fstat(int fd, struct stat *buf)
 531 {
 532         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 533         BY_HANDLE_FILE_INFORMATION fdata;
 534
 535         if (fh == INVALID_HANDLE_VALUE) {
 536                 errno = EBADF;
 537                 return -1;
 538         }
 539         /* direct non-file handles to MS's fstat() */
 540         if (GetFileType(fh) != FILE_TYPE_DISK)
 541                 return _fstati64(fd, buf);
 542
 543         if (GetFileInformationByHandle(fh, &fdata)) {
 544                 buf->st_ino = 0;
 545                 buf->st_gid = 0;
 546                 buf->st_uid = 0;
 547                 buf->st_nlink = 1;
 548                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 549                 buf->st_size = fdata.nFileSizeLow |
 550                         (((off_t)fdata.nFileSizeHigh)<<32);
 551                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 552                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 553                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 554                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 555                 return 0;
 556         }
 557         errno = EBADF;
 558         return -1;
 559 }
 560
 561 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 562 {
 563         long long winTime = t * 10000000LL + 116444736000000000LL;
 564         ft->dwLowDateTime = winTime;
 565         ft->dwHighDateTime = winTime >> 32;
 566 }
 567
 568 int mingw_utime (const char *file_name, const struct utimbuf *times)
 569 {
 570         FILETIME mft, aft;
 571         int fh, rc;
 572         DWORD attrs;
 573         wchar_t wfilename[MAX_PATH];
 574         if (xutftowcs_path(wfilename, file_name) < 0)
 575                 return -1;
 576
 577         /* must have write permission */
 578         attrs = GetFileAttributesW(wfilename);
 579         if (attrs != INVALID_FILE_ATTRIBUTES &&
 580             (attrs & FILE_ATTRIBUTE_READONLY)) {
 581                 /* ignore errors here; open() will report them */
 582                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 583         }
 584
 585         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 586                 rc = -1;
 587                 goto revert_attrs;
 588         }
 589
 590         if (times) {
 591                 time_t_to_filetime(times->modtime, &mft);
 592                 time_t_to_filetime(times->actime, &aft);
 593         } else {
 594                 GetSystemTimeAsFileTime(&mft);
 595                 aft = mft;
 596         }
 597         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 598                 errno = EINVAL;
 599                 rc = -1;
 600         } else
 601                 rc = 0;
 602         close(fh);
 603
 604 revert_attrs:
 605         if (attrs != INVALID_FILE_ATTRIBUTES &&
 606             (attrs & FILE_ATTRIBUTE_READONLY)) {
 607                 /* ignore errors again */
 608                 SetFileAttributesW(wfilename, attrs);
 609         }
 610         return rc;
 611 }
 612
 613 unsigned int sleep (unsigned int seconds)
 614 {
 615         Sleep(seconds*1000);
 616         return 0;
 617 }
 618
 619 char *mingw_mktemp(char *template)
 620 {
 621         wchar_t wtemplate[MAX_PATH];
 622         if (xutftowcs_path(wtemplate, template) < 0)
 623                 return NULL;
 624         if (!_wmktemp(wtemplate))
 625                 return NULL;
 626         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 627                 return NULL;
 628         return template;
 629 }
 630
 631 int mkstemp(char *template)
 632 {
 633         char *filename = mktemp(template);
 634         if (filename == NULL)
 635                 return -1;
 636         return open(filename, O_RDWR | O_CREAT, 0600);
 637 }
 638
 639 int gettimeofday(struct timeval *tv, void *tz)
 640 {
 641         FILETIME ft;
 642         long long hnsec;
 643
 644         GetSystemTimeAsFileTime(&ft);
 645         hnsec = filetime_to_hnsec(&ft);
 646         tv->tv_sec = hnsec / 10000000;
 647         tv->tv_usec = (hnsec % 10000000) / 10;
 648         return 0;
 649 }
 650
 651 int pipe(int filedes[2])
 652 {
 653         HANDLE h[2];
 654
 655         /* this creates non-inheritable handles */
 656         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 657                 errno = err_win_to_posix(GetLastError());
 658                 return -1;
 659         }
 660         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 661         if (filedes[0] < 0) {
 662                 CloseHandle(h[0]);
 663                 CloseHandle(h[1]);
 664                 return -1;
 665         }
 666         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 667         if (filedes[0] < 0) {
 668                 close(filedes[0]);
 669                 CloseHandle(h[1]);
 670                 return -1;
 671         }
 672         return 0;
 673 }
 674
 675 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 676 {
 677         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 678         memcpy(result, gmtime(timep), sizeof(struct tm));
 679         return result;
 680 }
 681
 682 struct tm *localtime_r(const time_t *timep, struct tm *result)
 683 {
 684         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 685         memcpy(result, localtime(timep), sizeof(struct tm));
 686         return result;
 687 }
 688
 689 char *mingw_getcwd(char *pointer, int len)
 690 {
 691         int i;
 692         wchar_t wpointer[MAX_PATH];
 693         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 694                 return NULL;
 695         if (xwcstoutf(pointer, wpointer, len) < 0)
 696                 return NULL;
 697         for (i = 0; pointer[i]; i++)
 698                 if (pointer[i] == '\\')
 699                         pointer[i] = '/';
 700         return pointer;
 701 }
 702
 703 /*
 704  * Compare environment entries by key (i.e. stopping at '=' or '\0').
 705  */
 706 static int compareenv(const void *v1, const void *v2)
 707 {
 708         const char *e1 = *(const char**)v1;
 709         const char *e2 = *(const char**)v2;
 710
 711         for (;;) {
 712                 int c1 = *e1++;
 713                 int c2 = *e2++;
 714                 c1 = (c1 == '=') ? 0 : tolower(c1);
 715                 c2 = (c2 == '=') ? 0 : tolower(c2);
 716                 if (c1 > c2)
 717                         return 1;
 718                 if (c1 < c2)
 719                         return -1;
 720                 if (c1 == 0)
 721                         return 0;
 722         }
 723 }
 724
 725 static int bsearchenv(char **env, const char *name, size_t size)
 726 {
 727         unsigned low = 0, high = size;
 728         while (low < high) {
 729                 unsigned mid = low + ((high - low) >> 1);
 730                 int cmp = compareenv(&env[mid], &name);
 731                 if (cmp < 0)
 732                         low = mid + 1;
 733                 else if (cmp > 0)
 734                         high = mid;
 735                 else
 736                         return mid;
 737         }
 738         return ~low; /* not found, return 1's complement of insert position */
 739 }
 740
 741 /*
 742  * If name contains '=', then sets the variable, otherwise it unsets it
 743  * Size includes the terminating NULL. Env must have room for size + 1 entries
 744  * (in case of insert). Returns the new size. Optionally frees removed entries.
 745  */
 746 static int do_putenv(char **env, const char *name, int size, int free_old)
 747 {
 748         int i = bsearchenv(env, name, size - 1);
 749
 750         /* optionally free removed / replaced entry */
 751         if (i >= 0 && free_old)
 752                 free(env[i]);
 753
 754         if (strchr(name, '=')) {
 755                 /* if new value ('key=value') is specified, insert or replace entry */
 756                 if (i < 0) {
 757                         i = ~i;
 758                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
 759                         size++;
 760                 }
 761                 env[i] = (char*) name;
 762         } else if (i >= 0) {
 763                 /* otherwise ('key') remove existing entry */
 764                 size--;
 765                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
 766         }
 767         return size;
 768 }
 769
 770 /* used number of elements of environ array, including terminating NULL */
 771 static int environ_size = 0;
 772 /* allocated size of environ array, in bytes */
 773 static int environ_alloc = 0;
 774
 775 char *mingw_getenv(const char *name)
 776 {
 777         char *value;
 778         int pos = bsearchenv(environ, name, environ_size - 1);
 779         if (pos < 0)
 780                 return NULL;
 781         value = strchr(environ[pos], '=');
 782         return value ? &value[1] : NULL;
 783 }
 784
 785 int mingw_putenv(const char *namevalue)
 786 {
 787         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
 788         environ_size = do_putenv(environ, namevalue, environ_size, 1);
 789         return 0;
 790 }
 791
 792 /*
 793  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 794  * (Parsing C++ Command-Line Arguments)
 795  */
 796 static const char *quote_arg(const char *arg)
 797 {
 798         /* count chars to quote */
 799         int len = 0, n = 0;
 800         int force_quotes = 0;
 801         char *q, *d;
 802         const char *p = arg;
 803         if (!*p) force_quotes = 1;
 804         while (*p) {
 805                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 806                         force_quotes = 1;
 807                 else if (*p == '"')
 808                         n++;
 809                 else if (*p == '\\') {
 810                         int count = 0;
 811                         while (*p == '\\') {
 812                                 count++;
 813                                 p++;
 814                                 len++;
 815                         }
 816                         if (*p == '"')
 817                                 n += count*2 + 1;
 818                         continue;
 819                 }
 820                 len++;
 821                 p++;
 822         }
 823         if (!force_quotes && n == 0)
 824                 return arg;
 825
 826         /* insert \ where necessary */
 827         d = q = xmalloc(len+n+3);
 828         *d++ = '"';
 829         while (*arg) {
 830                 if (*arg == '"')
 831                         *d++ = '\\';
 832                 else if (*arg == '\\') {
 833                         int count = 0;
 834                         while (*arg == '\\') {
 835                                 count++;
 836                                 *d++ = *arg++;
 837                         }
 838                         if (*arg == '"') {
 839                                 while (count-- > 0)
 840                                         *d++ = '\\';
 841                                 *d++ = '\\';
 842                         }
 843                 }
 844                 *d++ = *arg++;
 845         }
 846         *d++ = '"';
 847         *d++ = 0;
 848         return q;
 849 }
 850
 851 static const char *parse_interpreter(const char *cmd)
 852 {
 853         static char buf[100];
 854         char *p, *opt;
 855         int n, fd;
 856
 857         /* don't even try a .exe */
 858         n = strlen(cmd);
 859         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 860                 return NULL;
 861
 862         fd = open(cmd, O_RDONLY);
 863         if (fd < 0)
 864                 return NULL;
 865         n = read(fd, buf, sizeof(buf)-1);
 866         close(fd);
 867         if (n < 4)      /* at least '#!/x' and not error */
 868                 return NULL;
 869
 870         if (buf[0] != '#' || buf[1] != '!')
 871                 return NULL;
 872         buf[n] = '\0';
 873         p = buf + strcspn(buf, "\r\n");
 874         if (!*p)
 875                 return NULL;
 876
 877         *p = '\0';
 878         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 879                 return NULL;
 880         /* strip options */
 881         if ((opt = strchr(p+1, ' ')))
 882                 *opt = '\0';
 883         return p+1;
 884 }
 885
 886 /*
 887  * Splits the PATH into parts.
 888  */
 889 static char **get_path_split(void)
 890 {
 891         char *p, **path, *envpath = getenv("PATH");
 892         int i, n = 0;
 893
 894         if (!envpath || !*envpath)
 895                 return NULL;
 896
 897         envpath = xstrdup(envpath);
 898         p = envpath;
 899         while (p) {
 900                 char *dir = p;
 901                 p = strchr(p, ';');
 902                 if (p) *p++ = '\0';
 903                 if (*dir) {     /* not earlier, catches series of ; */
 904                         ++n;
 905                 }
 906         }
 907         if (!n)
 908                 return NULL;
 909
 910         path = xmalloc((n+1)*sizeof(char *));
 911         p = envpath;
 912         i = 0;
 913         do {
 914                 if (*p)
 915                         path[i++] = xstrdup(p);
 916                 p = p+strlen(p)+1;
 917         } while (i < n);
 918         path[i] = NULL;
 919
 920         free(envpath);
 921
 922         return path;
 923 }
 924
 925 static void free_path_split(char **path)
 926 {
 927         char **p = path;
 928
 929         if (!path)
 930                 return;
 931
 932         while (*p)
 933                 free(*p++);
 934         free(path);
 935 }
 936
 937 /*
 938  * exe_only means that we only want to detect .exe files, but not scripts
 939  * (which do not have an extension)
 940  */
 941 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 942 {
 943         char path[MAX_PATH];
 944         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 945
 946         if (!isexe && access(path, F_OK) == 0)
 947                 return xstrdup(path);
 948         path[strlen(path)-4] = '\0';
 949         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 950                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 951                         return xstrdup(path);
 952         return NULL;
 953 }
 954
 955 /*
 956  * Determines the absolute path of cmd using the split path in path.
 957  * If cmd contains a slash or backslash, no lookup is performed.
 958  */
 959 static char *path_lookup(const char *cmd, char **path, int exe_only)
 960 {
 961         char *prog = NULL;
 962         int len = strlen(cmd);
 963         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 964
 965         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 966                 prog = xstrdup(cmd);
 967
 968         while (!prog && *path)
 969                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 970
 971         return prog;
 972 }
 973
 974 /*
 975  * Create environment block suitable for CreateProcess. Merges current
 976  * process environment and the supplied environment changes.
 977  */
 978 static wchar_t *make_environment_block(char **deltaenv)
 979 {
 980         wchar_t *wenvblk = NULL;
 981         char **tmpenv;
 982         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
 983
 984         while (deltaenv && deltaenv[i])
 985                 i++;
 986
 987         /* copy the environment, leaving space for changes */
 988         tmpenv = xmalloc((size + i) * sizeof(char*));
 989         memcpy(tmpenv, environ, size * sizeof(char*));
 990
 991         /* merge supplied environment changes into the temporary environment */
 992         for (i = 0; deltaenv && deltaenv[i]; i++)
 993                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
 994
 995         /* create environment block from temporary environment */
 996         for (i = 0; tmpenv[i]; i++) {
 997                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
 998                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
 999                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1000         }
1001         /* add final \0 terminator */
1002         wenvblk[wenvpos] = 0;
1003         free(tmpenv);
1004         return wenvblk;
1005 }
1006
1007 struct pinfo_t {
1008         struct pinfo_t *next;
1009         pid_t pid;
1010         HANDLE proc;
1011 };
1012 static struct pinfo_t *pinfo = NULL;
1013 CRITICAL_SECTION pinfo_cs;
1014
1015 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1016                               const char *dir,
1017                               int prepend_cmd, int fhin, int fhout, int fherr)
1018 {
1019         STARTUPINFOW si;
1020         PROCESS_INFORMATION pi;
1021         struct strbuf args;
1022         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1023         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1024         BOOL ret;
1025
1026         /* Determine whether or not we are associated to a console */
1027         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1028                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1029                         FILE_ATTRIBUTE_NORMAL, NULL);
1030         if (cons == INVALID_HANDLE_VALUE) {
1031                 /* There is no console associated with this process.
1032                  * Since the child is a console process, Windows
1033                  * would normally create a console window. But
1034                  * since we'll be redirecting std streams, we do
1035                  * not need the console.
1036                  * It is necessary to use DETACHED_PROCESS
1037                  * instead of CREATE_NO_WINDOW to make ssh
1038                  * recognize that it has no console.
1039                  */
1040                 flags |= DETACHED_PROCESS;
1041         } else {
1042                 /* There is already a console. If we specified
1043                  * DETACHED_PROCESS here, too, Windows would
1044                  * disassociate the child from the console.
1045                  * The same is true for CREATE_NO_WINDOW.
1046                  * Go figure!
1047                  */
1048                 CloseHandle(cons);
1049         }
1050         memset(&si, 0, sizeof(si));
1051         si.cb = sizeof(si);
1052         si.dwFlags = STARTF_USESTDHANDLES;
1053         si.hStdInput = winansi_get_osfhandle(fhin);
1054         si.hStdOutput = winansi_get_osfhandle(fhout);
1055         si.hStdError = winansi_get_osfhandle(fherr);
1056
1057         if (xutftowcs_path(wcmd, cmd) < 0)
1058                 return -1;
1059         if (dir && xutftowcs_path(wdir, dir) < 0)
1060                 return -1;
1061
1062         /* concatenate argv, quoting args as we go */
1063         strbuf_init(&args, 0);
1064         if (prepend_cmd) {
1065                 char *quoted = (char *)quote_arg(cmd);
1066                 strbuf_addstr(&args, quoted);
1067                 if (quoted != cmd)
1068                         free(quoted);
1069         }
1070         for (; *argv; argv++) {
1071                 char *quoted = (char *)quote_arg(*argv);
1072                 if (*args.buf)
1073                         strbuf_addch(&args, ' ');
1074                 strbuf_addstr(&args, quoted);
1075                 if (quoted != *argv)
1076                         free(quoted);
1077         }
1078
1079         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1080         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1081         strbuf_release(&args);
1082
1083         wenvblk = make_environment_block(deltaenv);
1084
1085         memset(&pi, 0, sizeof(pi));
1086         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1087                 wenvblk, dir ? wdir : NULL, &si, &pi);
1088
1089         free(wenvblk);
1090         free(wargs);
1091
1092         if (!ret) {
1093                 errno = ENOENT;
1094                 return -1;
1095         }
1096         CloseHandle(pi.hThread);
1097
1098         /*
1099          * The process ID is the human-readable identifier of the process
1100          * that we want to present in log and error messages. The handle
1101          * is not useful for this purpose. But we cannot close it, either,
1102          * because it is not possible to turn a process ID into a process
1103          * handle after the process terminated.
1104          * Keep the handle in a list for waitpid.
1105          */
1106         EnterCriticalSection(&pinfo_cs);
1107         {
1108                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1109                 info->pid = pi.dwProcessId;
1110                 info->proc = pi.hProcess;
1111                 info->next = pinfo;
1112                 pinfo = info;
1113         }
1114         LeaveCriticalSection(&pinfo_cs);
1115
1116         return (pid_t)pi.dwProcessId;
1117 }
1118
1119 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1120 {
1121         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1122 }
1123
1124 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1125                      const char *dir,
1126                      int fhin, int fhout, int fherr)
1127 {
1128         pid_t pid;
1129         char **path = get_path_split();
1130         char *prog = path_lookup(cmd, path, 0);
1131
1132         if (!prog) {
1133                 errno = ENOENT;
1134                 pid = -1;
1135         }
1136         else {
1137                 const char *interpr = parse_interpreter(prog);
1138
1139                 if (interpr) {
1140                         const char *argv0 = argv[0];
1141                         char *iprog = path_lookup(interpr, path, 1);
1142                         argv[0] = prog;
1143                         if (!iprog) {
1144                                 errno = ENOENT;
1145                                 pid = -1;
1146                         }
1147                         else {
1148                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1149                                                        fhin, fhout, fherr);
1150                                 free(iprog);
1151                         }
1152                         argv[0] = argv0;
1153                 }
1154                 else
1155                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1156                                                fhin, fhout, fherr);
1157                 free(prog);
1158         }
1159         free_path_split(path);
1160         return pid;
1161 }
1162
1163 static int try_shell_exec(const char *cmd, char *const *argv)
1164 {
1165         const char *interpr = parse_interpreter(cmd);
1166         char **path;
1167         char *prog;
1168         int pid = 0;
1169
1170         if (!interpr)
1171                 return 0;
1172         path = get_path_split();
1173         prog = path_lookup(interpr, path, 1);
1174         if (prog) {
1175                 int argc = 0;
1176                 const char **argv2;
1177                 while (argv[argc]) argc++;
1178                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1179                 argv2[0] = (char *)cmd; /* full path to the script file */
1180                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1181                 pid = mingw_spawnv(prog, argv2, 1);
1182                 if (pid >= 0) {
1183                         int status;
1184                         if (waitpid(pid, &status, 0) < 0)
1185                                 status = 255;
1186                         exit(status);
1187                 }
1188                 pid = 1;        /* indicate that we tried but failed */
1189                 free(prog);
1190                 free(argv2);
1191         }
1192         free_path_split(path);
1193         return pid;
1194 }
1195
1196 int mingw_execv(const char *cmd, char *const *argv)
1197 {
1198         /* check if git_command is a shell script */
1199         if (!try_shell_exec(cmd, argv)) {
1200                 int pid, status;
1201
1202                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1203                 if (pid < 0)
1204                         return -1;
1205                 if (waitpid(pid, &status, 0) < 0)
1206                         status = 255;
1207                 exit(status);
1208         }
1209         return -1;
1210 }
1211
1212 int mingw_execvp(const char *cmd, char *const *argv)
1213 {
1214         char **path = get_path_split();
1215         char *prog = path_lookup(cmd, path, 0);
1216
1217         if (prog) {
1218                 mingw_execv(prog, argv);
1219                 free(prog);
1220         } else
1221                 errno = ENOENT;
1222
1223         free_path_split(path);
1224         return -1;
1225 }
1226
1227 int mingw_kill(pid_t pid, int sig)
1228 {
1229         if (pid > 0 && sig == SIGTERM) {
1230                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1231
1232                 if (TerminateProcess(h, -1)) {
1233                         CloseHandle(h);
1234                         return 0;
1235                 }
1236
1237                 errno = err_win_to_posix(GetLastError());
1238                 CloseHandle(h);
1239                 return -1;
1240         } else if (pid > 0 && sig == 0) {
1241                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1242                 if (h) {
1243                         CloseHandle(h);
1244                         return 0;
1245                 }
1246         }
1247
1248         errno = EINVAL;
1249         return -1;
1250 }
1251
1252 /*
1253  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1254  * that service contains a numerical port, or that it is null. It
1255  * does a simple search using gethostbyname, and returns one IPv4 host
1256  * if one was found.
1257  */
1258 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1259                                    const struct addrinfo *hints,
1260                                    struct addrinfo **res)
1261 {
1262         struct hostent *h = NULL;
1263         struct addrinfo *ai;
1264         struct sockaddr_in *sin;
1265
1266         if (node) {
1267                 h = gethostbyname(node);
1268                 if (!h)
1269                         return WSAGetLastError();
1270         }
1271
1272         ai = xmalloc(sizeof(struct addrinfo));
1273         *res = ai;
1274         ai->ai_flags = 0;
1275         ai->ai_family = AF_INET;
1276         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1277         switch (ai->ai_socktype) {
1278         case SOCK_STREAM:
1279                 ai->ai_protocol = IPPROTO_TCP;
1280                 break;
1281         case SOCK_DGRAM:
1282                 ai->ai_protocol = IPPROTO_UDP;
1283                 break;
1284         default:
1285                 ai->ai_protocol = 0;
1286                 break;
1287         }
1288         ai->ai_addrlen = sizeof(struct sockaddr_in);
1289         if (hints && (hints->ai_flags & AI_CANONNAME))
1290                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1291         else
1292                 ai->ai_canonname = NULL;
1293
1294         sin = xmalloc(ai->ai_addrlen);
1295         memset(sin, 0, ai->ai_addrlen);
1296         sin->sin_family = AF_INET;
1297         /* Note: getaddrinfo is supposed to allow service to be a string,
1298          * which should be looked up using getservbyname. This is
1299          * currently not implemented */
1300         if (service)
1301                 sin->sin_port = htons(atoi(service));
1302         if (h)
1303                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1304         else if (hints && (hints->ai_flags & AI_PASSIVE))
1305                 sin->sin_addr.s_addr = INADDR_ANY;
1306         else
1307                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1308         ai->ai_addr = (struct sockaddr *)sin;
1309         ai->ai_next = NULL;
1310         return 0;
1311 }
1312
1313 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1314 {
1315         free(res->ai_canonname);
1316         free(res->ai_addr);
1317         free(res);
1318 }
1319
1320 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1321                                    char *host, DWORD hostlen,
1322                                    char *serv, DWORD servlen, int flags)
1323 {
1324         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1325         if (sa->sa_family != AF_INET)
1326                 return EAI_FAMILY;
1327         if (!host && !serv)
1328                 return EAI_NONAME;
1329
1330         if (host && hostlen > 0) {
1331                 struct hostent *ent = NULL;
1332                 if (!(flags & NI_NUMERICHOST))
1333                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1334                                             sizeof(sin->sin_addr), AF_INET);
1335
1336                 if (ent)
1337                         snprintf(host, hostlen, "%s", ent->h_name);
1338                 else if (flags & NI_NAMEREQD)
1339                         return EAI_NONAME;
1340                 else
1341                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1342         }
1343
1344         if (serv && servlen > 0) {
1345                 struct servent *ent = NULL;
1346                 if (!(flags & NI_NUMERICSERV))
1347                         ent = getservbyport(sin->sin_port,
1348                                             flags & NI_DGRAM ? "udp" : "tcp");
1349
1350                 if (ent)
1351                         snprintf(serv, servlen, "%s", ent->s_name);
1352                 else
1353                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1354         }
1355
1356         return 0;
1357 }
1358
1359 static HMODULE ipv6_dll = NULL;
1360 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1361 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1362                                       const struct addrinfo *hints,
1363                                       struct addrinfo **res);
1364 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1365                                       char *host, DWORD hostlen,
1366                                       char *serv, DWORD servlen, int flags);
1367 /*
1368  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1369  * don't need to try to load that one dynamically.
1370  */
1371
1372 static void socket_cleanup(void)
1373 {
1374         WSACleanup();
1375         if (ipv6_dll)
1376                 FreeLibrary(ipv6_dll);
1377         ipv6_dll = NULL;
1378         ipv6_freeaddrinfo = freeaddrinfo_stub;
1379         ipv6_getaddrinfo = getaddrinfo_stub;
1380         ipv6_getnameinfo = getnameinfo_stub;
1381 }
1382
1383 static void ensure_socket_initialization(void)
1384 {
1385         WSADATA wsa;
1386         static int initialized = 0;
1387         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1388         const char **name;
1389
1390         if (initialized)
1391                 return;
1392
1393         if (WSAStartup(MAKEWORD(2,2), &wsa))
1394                 die("unable to initialize winsock subsystem, error %d",
1395                         WSAGetLastError());
1396
1397         for (name = libraries; *name; name++) {
1398                 ipv6_dll = LoadLibrary(*name);
1399                 if (!ipv6_dll)
1400                         continue;
1401
1402                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1403                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1404                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1405                                                    const struct addrinfo *,
1406                                                    struct addrinfo **))
1407                         GetProcAddress(ipv6_dll, "getaddrinfo");
1408                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1409                                                    socklen_t, char *, DWORD,
1410                                                    char *, DWORD, int))
1411                         GetProcAddress(ipv6_dll, "getnameinfo");
1412                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1413                         FreeLibrary(ipv6_dll);
1414                         ipv6_dll = NULL;
1415                 } else
1416                         break;
1417         }
1418         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1419                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1420                 ipv6_getaddrinfo = getaddrinfo_stub;
1421                 ipv6_getnameinfo = getnameinfo_stub;
1422         }
1423
1424         atexit(socket_cleanup);
1425         initialized = 1;
1426 }
1427
1428 #undef gethostname
1429 int mingw_gethostname(char *name, int namelen)
1430 {
1431     ensure_socket_initialization();
1432     return gethostname(name, namelen);
1433 }
1434
1435 #undef gethostbyname
1436 struct hostent *mingw_gethostbyname(const char *host)
1437 {
1438         ensure_socket_initialization();
1439         return gethostbyname(host);
1440 }
1441
1442 void mingw_freeaddrinfo(struct addrinfo *res)
1443 {
1444         ipv6_freeaddrinfo(res);
1445 }
1446
1447 int mingw_getaddrinfo(const char *node, const char *service,
1448                       const struct addrinfo *hints, struct addrinfo **res)
1449 {
1450         ensure_socket_initialization();
1451         return ipv6_getaddrinfo(node, service, hints, res);
1452 }
1453
1454 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1455                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1456                       int flags)
1457 {
1458         ensure_socket_initialization();
1459         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1460 }
1461
1462 int mingw_socket(int domain, int type, int protocol)
1463 {
1464         int sockfd;
1465         SOCKET s;
1466
1467         ensure_socket_initialization();
1468         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1469         if (s == INVALID_SOCKET) {
1470                 /*
1471                  * WSAGetLastError() values are regular BSD error codes
1472                  * biased by WSABASEERR.
1473                  * However, strerror() does not know about networking
1474                  * specific errors, which are values beginning at 38 or so.
1475                  * Therefore, we choose to leave the biased error code
1476                  * in errno so that _if_ someone looks up the code somewhere,
1477                  * then it is at least the number that are usually listed.
1478                  */
1479                 errno = WSAGetLastError();
1480                 return -1;
1481         }
1482         /* convert into a file descriptor */
1483         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1484                 closesocket(s);
1485                 return error("unable to make a socket file descriptor: %s",
1486                         strerror(errno));
1487         }
1488         return sockfd;
1489 }
1490
1491 #undef connect
1492 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1493 {
1494         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1495         return connect(s, sa, sz);
1496 }
1497
1498 #undef bind
1499 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1500 {
1501         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1502         return bind(s, sa, sz);
1503 }
1504
1505 #undef setsockopt
1506 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1507 {
1508         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1509         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1510 }
1511
1512 #undef shutdown
1513 int mingw_shutdown(int sockfd, int how)
1514 {
1515         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1516         return shutdown(s, how);
1517 }
1518
1519 #undef listen
1520 int mingw_listen(int sockfd, int backlog)
1521 {
1522         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1523         return listen(s, backlog);
1524 }
1525
1526 #undef accept
1527 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1528 {
1529         int sockfd2;
1530
1531         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1532         SOCKET s2 = accept(s1, sa, sz);
1533
1534         /* convert into a file descriptor */
1535         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1536                 int err = errno;
1537                 closesocket(s2);
1538                 return error("unable to make a socket file descriptor: %s",
1539                         strerror(err));
1540         }
1541         return sockfd2;
1542 }
1543
1544 #undef rename
1545 int mingw_rename(const char *pold, const char *pnew)
1546 {
1547         DWORD attrs, gle;
1548         int tries = 0;
1549         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1550         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1551                 return -1;
1552
1553         /*
1554          * Try native rename() first to get errno right.
1555          * It is based on MoveFile(), which cannot overwrite existing files.
1556          */
1557         if (!_wrename(wpold, wpnew))
1558                 return 0;
1559         if (errno != EEXIST)
1560                 return -1;
1561 repeat:
1562         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1563                 return 0;
1564         /* TODO: translate more errors */
1565         gle = GetLastError();
1566         if (gle == ERROR_ACCESS_DENIED &&
1567             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1568                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1569                         errno = EISDIR;
1570                         return -1;
1571                 }
1572                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1573                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1574                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1575                                 return 0;
1576                         gle = GetLastError();
1577                         /* revert file attributes on failure */
1578                         SetFileAttributesW(wpnew, attrs);
1579                 }
1580         }
1581         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1582                 /*
1583                  * We assume that some other process had the source or
1584                  * destination file open at the wrong moment and retry.
1585                  * In order to give the other process a higher chance to
1586                  * complete its operation, we give up our time slice now.
1587                  * If we have to retry again, we do sleep a bit.
1588                  */
1589                 Sleep(delay[tries]);
1590                 tries++;
1591                 goto repeat;
1592         }
1593         if (gle == ERROR_ACCESS_DENIED &&
1594                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1595                        "Should I try again?", pold, pnew))
1596                 goto repeat;
1597
1598         errno = EACCES;
1599         return -1;
1600 }
1601
1602 /*
1603  * Note that this doesn't return the actual pagesize, but
1604  * the allocation granularity. If future Windows specific git code
1605  * needs the real getpagesize function, we need to find another solution.
1606  */
1607 int mingw_getpagesize(void)
1608 {
1609         SYSTEM_INFO si;
1610         GetSystemInfo(&si);
1611         return si.dwAllocationGranularity;
1612 }
1613
1614 struct passwd *getpwuid(int uid)
1615 {
1616         static char user_name[100];
1617         static struct passwd p;
1618
1619         DWORD len = sizeof(user_name);
1620         if (!GetUserName(user_name, &len))
1621                 return NULL;
1622         p.pw_name = user_name;
1623         p.pw_gecos = "unknown";
1624         p.pw_dir = NULL;
1625         return &p;
1626 }
1627
1628 static HANDLE timer_event;
1629 static HANDLE timer_thread;
1630 static int timer_interval;
1631 static int one_shot;
1632 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1633
1634 /* The timer works like this:
1635  * The thread, ticktack(), is a trivial routine that most of the time
1636  * only waits to receive the signal to terminate. The main thread tells
1637  * the thread to terminate by setting the timer_event to the signalled
1638  * state.
1639  * But ticktack() interrupts the wait state after the timer's interval
1640  * length to call the signal handler.
1641  */
1642
1643 static unsigned __stdcall ticktack(void *dummy)
1644 {
1645         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1646                 mingw_raise(SIGALRM);
1647                 if (one_shot)
1648                         break;
1649         }
1650         return 0;
1651 }
1652
1653 static int start_timer_thread(void)
1654 {
1655         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1656         if (timer_event) {
1657                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1658                 if (!timer_thread )
1659                         return errno = ENOMEM,
1660                                 error("cannot start timer thread");
1661         } else
1662                 return errno = ENOMEM,
1663                         error("cannot allocate resources for timer");
1664         return 0;
1665 }
1666
1667 static void stop_timer_thread(void)
1668 {
1669         if (timer_event)
1670                 SetEvent(timer_event);  /* tell thread to terminate */
1671         if (timer_thread) {
1672                 int rc = WaitForSingleObject(timer_thread, 1000);
1673                 if (rc == WAIT_TIMEOUT)
1674                         error("timer thread did not terminate timely");
1675                 else if (rc != WAIT_OBJECT_0)
1676                         error("waiting for timer thread failed: %lu",
1677                               GetLastError());
1678                 CloseHandle(timer_thread);
1679         }
1680         if (timer_event)
1681                 CloseHandle(timer_event);
1682         timer_event = NULL;
1683         timer_thread = NULL;
1684 }
1685
1686 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1687 {
1688         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1689 }
1690
1691 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1692 {
1693         static const struct timeval zero;
1694         static int atexit_done;
1695
1696         if (out != NULL)
1697                 return errno = EINVAL,
1698                         error("setitimer param 3 != NULL not implemented");
1699         if (!is_timeval_eq(&in->it_interval, &zero) &&
1700             !is_timeval_eq(&in->it_interval, &in->it_value))
1701                 return errno = EINVAL,
1702                         error("setitimer: it_interval must be zero or eq it_value");
1703
1704         if (timer_thread)
1705                 stop_timer_thread();
1706
1707         if (is_timeval_eq(&in->it_value, &zero) &&
1708             is_timeval_eq(&in->it_interval, &zero))
1709                 return 0;
1710
1711         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1712         one_shot = is_timeval_eq(&in->it_interval, &zero);
1713         if (!atexit_done) {
1714                 atexit(stop_timer_thread);
1715                 atexit_done = 1;
1716         }
1717         return start_timer_thread();
1718 }
1719
1720 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1721 {
1722         if (sig != SIGALRM)
1723                 return errno = EINVAL,
1724                         error("sigaction only implemented for SIGALRM");
1725         if (out != NULL)
1726                 return errno = EINVAL,
1727                         error("sigaction: param 3 != NULL not implemented");
1728
1729         timer_fn = in->sa_handler;
1730         return 0;
1731 }
1732
1733 #undef signal
1734 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1735 {
1736         sig_handler_t old;
1737
1738         switch (sig) {
1739         case SIGALRM:
1740                 old = timer_fn;
1741                 timer_fn = handler;
1742                 break;
1743
1744         case SIGINT:
1745                 old = sigint_fn;
1746                 sigint_fn = handler;
1747                 break;
1748
1749         default:
1750                 return signal(sig, handler);
1751         }
1752
1753         return old;
1754 }
1755
1756 #undef raise
1757 int mingw_raise(int sig)
1758 {
1759         switch (sig) {
1760         case SIGALRM:
1761                 if (timer_fn == SIG_DFL) {
1762                         if (isatty(STDERR_FILENO))
1763                                 fputs("Alarm clock\n", stderr);
1764                         exit(128 + SIGALRM);
1765                 } else if (timer_fn != SIG_IGN)
1766                         timer_fn(SIGALRM);
1767                 return 0;
1768
1769         case SIGINT:
1770                 if (sigint_fn == SIG_DFL)
1771                         exit(128 + SIGINT);
1772                 else if (sigint_fn != SIG_IGN)
1773                         sigint_fn(SIGINT);
1774                 return 0;
1775
1776         default:
1777                 return raise(sig);
1778         }
1779 }
1780
1781
1782 static const char *make_backslash_path(const char *path)
1783 {
1784         static char buf[PATH_MAX + 1];
1785         char *c;
1786
1787         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1788                 die("Too long path: %.*s", 60, path);
1789
1790         for (c = buf; *c; c++) {
1791                 if (*c == '/')
1792                         *c = '\\';
1793         }
1794         return buf;
1795 }
1796
1797 void mingw_open_html(const char *unixpath)
1798 {
1799         const char *htmlpath = make_backslash_path(unixpath);
1800         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1801                         const char *, const char *, const char *, INT);
1802         T ShellExecute;
1803         HMODULE shell32;
1804         int r;
1805
1806         shell32 = LoadLibrary("shell32.dll");
1807         if (!shell32)
1808                 die("cannot load shell32.dll");
1809         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1810         if (!ShellExecute)
1811                 die("cannot run browser");
1812
1813         printf("Launching default browser to display HTML ...\n");
1814         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1815         FreeLibrary(shell32);
1816         /* see the MSDN documentation referring to the result codes here */
1817         if (r <= 32) {
1818                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1819         }
1820 }
1821
1822 int link(const char *oldpath, const char *newpath)
1823 {
1824         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1825         static T create_hard_link = NULL;
1826         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1827         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1828                 xutftowcs_path(wnewpath, newpath) < 0)
1829                 return -1;
1830
1831         if (!create_hard_link) {
1832                 create_hard_link = (T) GetProcAddress(
1833                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1834                 if (!create_hard_link)
1835                         create_hard_link = (T)-1;
1836         }
1837         if (create_hard_link == (T)-1) {
1838                 errno = ENOSYS;
1839                 return -1;
1840         }
1841         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1842                 errno = err_win_to_posix(GetLastError());
1843                 return -1;
1844         }
1845         return 0;
1846 }
1847
1848 pid_t waitpid(pid_t pid, int *status, int options)
1849 {
1850         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1851             FALSE, pid);
1852         if (!h) {
1853                 errno = ECHILD;
1854                 return -1;
1855         }
1856
1857         if (pid > 0 && options & WNOHANG) {
1858                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1859                         CloseHandle(h);
1860                         return 0;
1861                 }
1862                 options &= ~WNOHANG;
1863         }
1864
1865         if (options == 0) {
1866                 struct pinfo_t **ppinfo;
1867                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1868                         CloseHandle(h);
1869                         return 0;
1870                 }
1871
1872                 if (status)
1873                         GetExitCodeProcess(h, (LPDWORD)status);
1874
1875                 EnterCriticalSection(&pinfo_cs);
1876
1877                 ppinfo = &pinfo;
1878                 while (*ppinfo) {
1879                         struct pinfo_t *info = *ppinfo;
1880                         if (info->pid == pid) {
1881                                 CloseHandle(info->proc);
1882                                 *ppinfo = info->next;
1883                                 free(info);
1884                                 break;
1885                         }
1886                         ppinfo = &info->next;
1887                 }
1888
1889                 LeaveCriticalSection(&pinfo_cs);
1890
1891                 CloseHandle(h);
1892                 return pid;
1893         }
1894         CloseHandle(h);
1895
1896         errno = EINVAL;
1897         return -1;
1898 }
1899
1900 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1901 {
1902         int upos = 0, wpos = 0;
1903         const unsigned char *utf = (const unsigned char*) utfs;
1904         if (!utf || !wcs || wcslen < 1) {
1905                 errno = EINVAL;
1906                 return -1;
1907         }
1908         /* reserve space for \0 */
1909         wcslen--;
1910         if (utflen < 0)
1911                 utflen = INT_MAX;
1912
1913         while (upos < utflen) {
1914                 int c = utf[upos++] & 0xff;
1915                 if (utflen == INT_MAX && c == 0)
1916                         break;
1917
1918                 if (wpos >= wcslen) {
1919                         wcs[wpos] = 0;
1920                         errno = ERANGE;
1921                         return -1;
1922                 }
1923
1924                 if (c < 0x80) {
1925                         /* ASCII */
1926                         wcs[wpos++] = c;
1927                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1928                                 (utf[upos] & 0xc0) == 0x80) {
1929                         /* 2-byte utf-8 */
1930                         c = ((c & 0x1f) << 6);
1931                         c |= (utf[upos++] & 0x3f);
1932                         wcs[wpos++] = c;
1933                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1934                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1935                                 (utf[upos] & 0xc0) == 0x80 &&
1936                                 (utf[upos + 1] & 0xc0) == 0x80) {
1937                         /* 3-byte utf-8 */
1938                         c = ((c & 0x0f) << 12);
1939                         c |= ((utf[upos++] & 0x3f) << 6);
1940                         c |= (utf[upos++] & 0x3f);
1941                         wcs[wpos++] = c;
1942                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
1943                                 wpos + 1 < wcslen &&
1944                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
1945                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
1946                                 (utf[upos] & 0xc0) == 0x80 &&
1947                                 (utf[upos + 1] & 0xc0) == 0x80 &&
1948                                 (utf[upos + 2] & 0xc0) == 0x80) {
1949                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
1950                         c = ((c & 0x07) << 18);
1951                         c |= ((utf[upos++] & 0x3f) << 12);
1952                         c |= ((utf[upos++] & 0x3f) << 6);
1953                         c |= (utf[upos++] & 0x3f);
1954                         c -= 0x10000;
1955                         wcs[wpos++] = 0xd800 | (c >> 10);
1956                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
1957                 } else if (c >= 0xa0) {
1958                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
1959                         wcs[wpos++] = c;
1960                 } else {
1961                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
1962                         static const char *hex = "0123456789abcdef";
1963                         wcs[wpos++] = hex[c >> 4];
1964                         if (wpos < wcslen)
1965                                 wcs[wpos++] = hex[c & 0x0f];
1966                 }
1967         }
1968         wcs[wpos] = 0;
1969         return wpos;
1970 }
1971
1972 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
1973 {
1974         if (!wcs || !utf || utflen < 1) {
1975                 errno = EINVAL;
1976                 return -1;
1977         }
1978         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
1979         if (utflen)
1980                 return utflen - 1;
1981         errno = ERANGE;
1982         return -1;
1983 }
1984
1985 /*
1986  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
1987  * mingw startup code, see init.c in mingw runtime).
1988  */
1989 int _CRT_glob = 0;
1990
1991 typedef struct {
1992         int newmode;
1993 } _startupinfo;
1994
1995 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
1996                 _startupinfo *si);
1997
1998 static NORETURN void die_startup()
1999 {
2000         fputs("fatal: not enough memory for initialization", stderr);
2001         exit(128);
2002 }
2003
2004 static void *malloc_startup(size_t size)
2005 {
2006         void *result = malloc(size);
2007         if (!result)
2008                 die_startup();
2009         return result;
2010 }
2011
2012 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2013 {
2014         len = xwcstoutf(buffer, wcs, len) + 1;
2015         return memcpy(malloc_startup(len), buffer, len);
2016 }
2017
2018 void mingw_startup()
2019 {
2020         int i, maxlen, argc;
2021         char *buffer;
2022         wchar_t **wenv, **wargv;
2023         _startupinfo si;
2024
2025         /* get wide char arguments and environment */
2026         si.newmode = 0;
2027         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2028                 die_startup();
2029
2030         /* determine size of argv and environ conversion buffer */
2031         maxlen = wcslen(_wpgmptr);
2032         for (i = 1; i < argc; i++)
2033                 maxlen = max(maxlen, wcslen(wargv[i]));
2034         for (i = 0; wenv[i]; i++)
2035                 maxlen = max(maxlen, wcslen(wenv[i]));
2036
2037         /*
2038          * nedmalloc can't free CRT memory, allocate resizable environment
2039          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2040          * use it while initializing the environment itself.
2041          */
2042         environ_size = i + 1;
2043         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2044         environ = malloc_startup(environ_alloc);
2045
2046         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2047         maxlen = 3 * maxlen + 1;
2048         buffer = malloc_startup(maxlen);
2049
2050         /* convert command line arguments and environment to UTF-8 */
2051         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2052         for (i = 1; i < argc; i++)
2053                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2054         for (i = 0; wenv[i]; i++)
2055                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2056         environ[i] = NULL;
2057         free(buffer);
2058
2059         /* sort environment for O(log n) getenv / putenv */
2060         qsort(environ, i, sizeof(char*), compareenv);
2061
2062         /* fix Windows specific environment settings */
2063
2064         /* on Windows it is TMP and TEMP */
2065         if (!getenv("TMPDIR")) {
2066                 const char *tmp = getenv("TMP");
2067                 if (!tmp)
2068                         tmp = getenv("TEMP");
2069                 if (tmp)
2070                         setenv("TMPDIR", tmp, 1);
2071         }
2072
2073         /* simulate TERM to enable auto-color (see color.c) */
2074         if (!getenv("TERM"))
2075                 setenv("TERM", "winansi", 1);
2076
2077         /* initialize critical section for waitpid pinfo_t list */
2078         InitializeCriticalSection(&pinfo_cs);
2079
2080         /* set up default file mode and file modes for stdin/out/err */
2081         _fmode = _O_BINARY;
2082         _setmode(_fileno(stdin), _O_BINARY);
2083         _setmode(_fileno(stdout), _O_BINARY);
2084         _setmode(_fileno(stderr), _O_BINARY);
2085
2086         /* initialize Unicode console */
2087         winansi_init();
2088 }