compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <wchar.h>
   5 #include "../strbuf.h"
   6 #include "../run-command.h"
   7 #include "../cache.h"
   8
   9 static const int delay[] = { 0, 1, 10, 20, 40 };
  10
  11 int err_win_to_posix(DWORD winerr)
  12 {
  13         int error = ENOSYS;
  14         switch(winerr) {
  15         case ERROR_ACCESS_DENIED: error = EACCES; break;
  16         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  17         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  18         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  19         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  20         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  21         case ERROR_BAD_COMMAND: error = EIO; break;
  22         case ERROR_BAD_DEVICE: error = ENODEV; break;
  23         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  24         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  25         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_LENGTH: error = EINVAL; break;
  27         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  28         case ERROR_BAD_PIPE: error = EPIPE; break;
  29         case ERROR_BAD_UNIT: error = ENODEV; break;
  30         case ERROR_BAD_USERNAME: error = EINVAL; break;
  31         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  32         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  33         case ERROR_BUSY: error = EBUSY; break;
  34         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  35         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  36         case ERROR_CANNOT_MAKE: error = EACCES; break;
  37         case ERROR_CANTOPEN: error = EIO; break;
  38         case ERROR_CANTREAD: error = EIO; break;
  39         case ERROR_CANTWRITE: error = EIO; break;
  40         case ERROR_CRC: error = EIO; break;
  41         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  42         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  43         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  44         case ERROR_DIRECTORY: error = EINVAL; break;
  45         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  46         case ERROR_DISK_CHANGE: error = EIO; break;
  47         case ERROR_DISK_FULL: error = ENOSPC; break;
  48         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  49         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  50         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  51         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  52         case ERROR_FILE_EXISTS: error = EEXIST; break;
  53         case ERROR_FILE_INVALID: error = ENODEV; break;
  54         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  55         case ERROR_GEN_FAILURE: error = EIO; break;
  56         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  57         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  58         case ERROR_INVALID_ACCESS: error = EACCES; break;
  59         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  60         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  61         case ERROR_INVALID_DATA: error = EINVAL; break;
  62         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  63         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  64         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  65         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  66         case ERROR_INVALID_HANDLE: error = EBADF; break;
  67         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  68         case ERROR_INVALID_NAME: error = EINVAL; break;
  69         case ERROR_INVALID_OWNER: error = EINVAL; break;
  70         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  71         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  72         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  73         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  74         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  75         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  76         case ERROR_IO_DEVICE: error = EIO; break;
  77         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  78         case ERROR_LOCKED: error = EBUSY; break;
  79         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  80         case ERROR_LOGON_FAILURE: error = EACCES; break;
  81         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  82         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  83         case ERROR_MORE_DATA: error = EPIPE; break;
  84         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  85         case ERROR_NOACCESS: error = EFAULT; break;
  86         case ERROR_NONE_MAPPED: error = EINVAL; break;
  87         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  88         case ERROR_NOT_READY: error = EAGAIN; break;
  89         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  90         case ERROR_NO_DATA: error = EPIPE; break;
  91         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  92         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  93         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  94         case ERROR_OPEN_FAILED: error = EIO; break;
  95         case ERROR_OPEN_FILES: error = EBUSY; break;
  96         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  97         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  98         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  99         case ERROR_PATH_BUSY: error = EBUSY; break;
 100         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 101         case ERROR_PIPE_BUSY: error = EBUSY; break;
 102         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 103         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 104         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 105         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 106         case ERROR_READ_FAULT: error = EIO; break;
 107         case ERROR_SEEK: error = EIO; break;
 108         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 109         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 110         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 111         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 112         case ERROR_SWAPERROR: error = ENOENT; break;
 113         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 114         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 115         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 116         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 117         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 118         case ERROR_WRITE_FAULT: error = EIO; break;
 119         case ERROR_WRITE_PROTECT: error = EROFS; break;
 120         }
 121         return error;
 122 }
 123
 124 static inline int is_file_in_use_error(DWORD errcode)
 125 {
 126         switch (errcode) {
 127         case ERROR_SHARING_VIOLATION:
 128         case ERROR_ACCESS_DENIED:
 129                 return 1;
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int read_yes_no_answer(void)
 136 {
 137         char answer[1024];
 138
 139         if (fgets(answer, sizeof(answer), stdin)) {
 140                 size_t answer_len = strlen(answer);
 141                 int got_full_line = 0, c;
 142
 143                 /* remove the newline */
 144                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 145                         answer[answer_len-2] = '\0';
 146                         got_full_line = 1;
 147                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 148                         answer[answer_len-1] = '\0';
 149                         got_full_line = 1;
 150                 }
 151                 /* flush the buffer in case we did not get the full line */
 152                 if (!got_full_line)
 153                         while ((c = getchar()) != EOF && c != '\n')
 154                                 ;
 155         } else
 156                 /* we could not read, return the
 157                  * default answer which is no */
 158                 return 0;
 159
 160         if (tolower(answer[0]) == 'y' && !answer[1])
 161                 return 1;
 162         if (!strncasecmp(answer, "yes", sizeof(answer)))
 163                 return 1;
 164         if (tolower(answer[0]) == 'n' && !answer[1])
 165                 return 0;
 166         if (!strncasecmp(answer, "no", sizeof(answer)))
 167                 return 0;
 168
 169         /* did not find an answer we understand */
 170         return -1;
 171 }
 172
 173 static int ask_yes_no_if_possible(const char *format, ...)
 174 {
 175         char question[4096];
 176         const char *retry_hook[] = { NULL, NULL, NULL };
 177         va_list args;
 178
 179         va_start(args, format);
 180         vsnprintf(question, sizeof(question), format, args);
 181         va_end(args);
 182
 183         if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 184                 retry_hook[1] = question;
 185                 return !run_command_v_opt(retry_hook, 0);
 186         }
 187
 188         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 189                 return 0;
 190
 191         while (1) {
 192                 int answer;
 193                 fprintf(stderr, "%s (y/n) ", question);
 194
 195                 if ((answer = read_yes_no_answer()) >= 0)
 196                         return answer;
 197
 198                 fprintf(stderr, "Sorry, I did not understand your answer. "
 199                                 "Please type 'y' or 'n'\n");
 200         }
 201 }
 202
 203 int mingw_unlink(const char *pathname)
 204 {
 205         int ret, tries = 0;
 206         wchar_t wpathname[MAX_PATH];
 207         if (xutftowcs_path(wpathname, pathname) < 0)
 208                 return -1;
 209
 210         /* read-only files cannot be removed */
 211         _wchmod(wpathname, 0666);
 212         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 213                 if (!is_file_in_use_error(GetLastError()))
 214                         break;
 215                 /*
 216                  * We assume that some other process had the source or
 217                  * destination file open at the wrong moment and retry.
 218                  * In order to give the other process a higher chance to
 219                  * complete its operation, we give up our time slice now.
 220                  * If we have to retry again, we do sleep a bit.
 221                  */
 222                 Sleep(delay[tries]);
 223                 tries++;
 224         }
 225         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 226                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 227                         "Should I try again?", pathname))
 228                ret = _wunlink(wpathname);
 229         return ret;
 230 }
 231
 232 static int is_dir_empty(const wchar_t *wpath)
 233 {
 234         WIN32_FIND_DATAW findbuf;
 235         HANDLE handle;
 236         wchar_t wbuf[MAX_PATH + 2];
 237         wcscpy(wbuf, wpath);
 238         wcscat(wbuf, L"\\*");
 239         handle = FindFirstFileW(wbuf, &findbuf);
 240         if (handle == INVALID_HANDLE_VALUE)
 241                 return GetLastError() == ERROR_NO_MORE_FILES;
 242
 243         while (!wcscmp(findbuf.cFileName, L".") ||
 244                         !wcscmp(findbuf.cFileName, L".."))
 245                 if (!FindNextFileW(handle, &findbuf)) {
 246                         DWORD err = GetLastError();
 247                         FindClose(handle);
 248                         return err == ERROR_NO_MORE_FILES;
 249                 }
 250         FindClose(handle);
 251         return 0;
 252 }
 253
 254 int mingw_rmdir(const char *pathname)
 255 {
 256         int ret, tries = 0;
 257         wchar_t wpathname[MAX_PATH];
 258         if (xutftowcs_path(wpathname, pathname) < 0)
 259                 return -1;
 260
 261         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 262                 if (!is_file_in_use_error(GetLastError()))
 263                         errno = err_win_to_posix(GetLastError());
 264                 if (errno != EACCES)
 265                         break;
 266                 if (!is_dir_empty(wpathname)) {
 267                         errno = ENOTEMPTY;
 268                         break;
 269                 }
 270                 /*
 271                  * We assume that some other process had the source or
 272                  * destination file open at the wrong moment and retry.
 273                  * In order to give the other process a higher chance to
 274                  * complete its operation, we give up our time slice now.
 275                  * If we have to retry again, we do sleep a bit.
 276                  */
 277                 Sleep(delay[tries]);
 278                 tries++;
 279         }
 280         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 281                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 282                         "Should I try again?", pathname))
 283                ret = _wrmdir(wpathname);
 284         return ret;
 285 }
 286
 287 int mingw_mkdir(const char *path, int mode)
 288 {
 289         int ret;
 290         wchar_t wpath[MAX_PATH];
 291         if (xutftowcs_path(wpath, path) < 0)
 292                 return -1;
 293         ret = _wmkdir(wpath);
 294         return ret;
 295 }
 296
 297 int mingw_open (const char *filename, int oflags, ...)
 298 {
 299         va_list args;
 300         unsigned mode;
 301         int fd;
 302         wchar_t wfilename[MAX_PATH];
 303
 304         va_start(args, oflags);
 305         mode = va_arg(args, int);
 306         va_end(args);
 307
 308         if (filename && !strcmp(filename, "/dev/null"))
 309                 filename = "nul";
 310
 311         if (xutftowcs_path(wfilename, filename) < 0)
 312                 return -1;
 313         fd = _wopen(wfilename, oflags, mode);
 314
 315         if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 316                 DWORD attrs = GetFileAttributesW(wfilename);
 317                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 318                         errno = EISDIR;
 319         }
 320         return fd;
 321 }
 322
 323 static BOOL WINAPI ctrl_ignore(DWORD type)
 324 {
 325         return TRUE;
 326 }
 327
 328 #undef fgetc
 329 int mingw_fgetc(FILE *stream)
 330 {
 331         int ch;
 332         if (!isatty(_fileno(stream)))
 333                 return fgetc(stream);
 334
 335         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 336         while (1) {
 337                 ch = fgetc(stream);
 338                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 339                         break;
 340
 341                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 342                 mingw_raise(SIGINT);
 343         }
 344         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 345         return ch;
 346 }
 347
 348 #undef fopen
 349 FILE *mingw_fopen (const char *filename, const char *otype)
 350 {
 351         FILE *file;
 352         wchar_t wfilename[MAX_PATH], wotype[4];
 353         if (filename && !strcmp(filename, "/dev/null"))
 354                 filename = "nul";
 355         if (xutftowcs_path(wfilename, filename) < 0 ||
 356                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 357                 return NULL;
 358         file = _wfopen(wfilename, wotype);
 359         return file;
 360 }
 361
 362 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 363 {
 364         FILE *file;
 365         wchar_t wfilename[MAX_PATH], wotype[4];
 366         if (filename && !strcmp(filename, "/dev/null"))
 367                 filename = "nul";
 368         if (xutftowcs_path(wfilename, filename) < 0 ||
 369                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 370                 return NULL;
 371         file = _wfreopen(wfilename, wotype, stream);
 372         return file;
 373 }
 374
 375 #undef fflush
 376 int mingw_fflush(FILE *stream)
 377 {
 378         int ret = fflush(stream);
 379
 380         /*
 381          * write() is used behind the scenes of stdio output functions.
 382          * Since git code does not check for errors after each stdio write
 383          * operation, it can happen that write() is called by a later
 384          * stdio function even if an earlier write() call failed. In the
 385          * case of a pipe whose readable end was closed, only the first
 386          * call to write() reports EPIPE on Windows. Subsequent write()
 387          * calls report EINVAL. It is impossible to notice whether this
 388          * fflush invocation triggered such a case, therefore, we have to
 389          * catch all EINVAL errors whole-sale.
 390          */
 391         if (ret && errno == EINVAL)
 392                 errno = EPIPE;
 393
 394         return ret;
 395 }
 396
 397 #undef write
 398 ssize_t mingw_write(int fd, const void *buf, size_t len)
 399 {
 400         ssize_t result = write(fd, buf, len);
 401
 402         if (result < 0 && errno == EINVAL && buf) {
 403                 /* check if fd is a pipe */
 404                 HANDLE h = (HANDLE) _get_osfhandle(fd);
 405                 if (GetFileType(h) == FILE_TYPE_PIPE)
 406                         errno = EPIPE;
 407                 else
 408                         errno = EINVAL;
 409         }
 410
 411         return result;
 412 }
 413
 414 int mingw_access(const char *filename, int mode)
 415 {
 416         wchar_t wfilename[MAX_PATH];
 417         if (xutftowcs_path(wfilename, filename) < 0)
 418                 return -1;
 419         /* X_OK is not supported by the MSVCRT version */
 420         return _waccess(wfilename, mode & ~X_OK);
 421 }
 422
 423 int mingw_chdir(const char *dirname)
 424 {
 425         wchar_t wdirname[MAX_PATH];
 426         if (xutftowcs_path(wdirname, dirname) < 0)
 427                 return -1;
 428         return _wchdir(wdirname);
 429 }
 430
 431 int mingw_chmod(const char *filename, int mode)
 432 {
 433         wchar_t wfilename[MAX_PATH];
 434         if (xutftowcs_path(wfilename, filename) < 0)
 435                 return -1;
 436         return _wchmod(wfilename, mode);
 437 }
 438
 439 /*
 440  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 441  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 442  */
 443 static inline long long filetime_to_hnsec(const FILETIME *ft)
 444 {
 445         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 446         /* Windows to Unix Epoch conversion */
 447         return winTime - 116444736000000000LL;
 448 }
 449
 450 static inline time_t filetime_to_time_t(const FILETIME *ft)
 451 {
 452         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 453 }
 454
 455 /* We keep the do_lstat code in a separate function to avoid recursion.
 456  * When a path ends with a slash, the stat will fail with ENOENT. In
 457  * this case, we strip the trailing slashes and stat again.
 458  *
 459  * If follow is true then act like stat() and report on the link
 460  * target. Otherwise report on the link itself.
 461  */
 462 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 463 {
 464         WIN32_FILE_ATTRIBUTE_DATA fdata;
 465         wchar_t wfilename[MAX_PATH];
 466         if (xutftowcs_path(wfilename, file_name) < 0)
 467                 return -1;
 468
 469         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 470                 buf->st_ino = 0;
 471                 buf->st_gid = 0;
 472                 buf->st_uid = 0;
 473                 buf->st_nlink = 1;
 474                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 475                 buf->st_size = fdata.nFileSizeLow |
 476                         (((off_t)fdata.nFileSizeHigh)<<32);
 477                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 478                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 479                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 480                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 481                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 482                         WIN32_FIND_DATAW findbuf;
 483                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 484                         if (handle != INVALID_HANDLE_VALUE) {
 485                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 486                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 487                                         if (follow) {
 488                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 489                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 490                                         } else {
 491                                                 buf->st_mode = S_IFLNK;
 492                                         }
 493                                         buf->st_mode |= S_IREAD;
 494                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 495                                                 buf->st_mode |= S_IWRITE;
 496                                 }
 497                                 FindClose(handle);
 498                         }
 499                 }
 500                 return 0;
 501         }
 502         switch (GetLastError()) {
 503         case ERROR_ACCESS_DENIED:
 504         case ERROR_SHARING_VIOLATION:
 505         case ERROR_LOCK_VIOLATION:
 506         case ERROR_SHARING_BUFFER_EXCEEDED:
 507                 errno = EACCES;
 508                 break;
 509         case ERROR_BUFFER_OVERFLOW:
 510                 errno = ENAMETOOLONG;
 511                 break;
 512         case ERROR_NOT_ENOUGH_MEMORY:
 513                 errno = ENOMEM;
 514                 break;
 515         default:
 516                 errno = ENOENT;
 517                 break;
 518         }
 519         return -1;
 520 }
 521
 522 /* We provide our own lstat/fstat functions, since the provided
 523  * lstat/fstat functions are so slow. These stat functions are
 524  * tailored for Git's usage (read: fast), and are not meant to be
 525  * complete. Note that Git stat()s are redirected to mingw_lstat()
 526  * too, since Windows doesn't really handle symlinks that well.
 527  */
 528 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 529 {
 530         int namelen;
 531         char alt_name[PATH_MAX];
 532
 533         if (!do_lstat(follow, file_name, buf))
 534                 return 0;
 535
 536         /* if file_name ended in a '/', Windows returned ENOENT;
 537          * try again without trailing slashes
 538          */
 539         if (errno != ENOENT)
 540                 return -1;
 541
 542         namelen = strlen(file_name);
 543         if (namelen && file_name[namelen-1] != '/')
 544                 return -1;
 545         while (namelen && file_name[namelen-1] == '/')
 546                 --namelen;
 547         if (!namelen || namelen >= PATH_MAX)
 548                 return -1;
 549
 550         memcpy(alt_name, file_name, namelen);
 551         alt_name[namelen] = 0;
 552         return do_lstat(follow, alt_name, buf);
 553 }
 554
 555 int mingw_lstat(const char *file_name, struct stat *buf)
 556 {
 557         return do_stat_internal(0, file_name, buf);
 558 }
 559 int mingw_stat(const char *file_name, struct stat *buf)
 560 {
 561         return do_stat_internal(1, file_name, buf);
 562 }
 563
 564 int mingw_fstat(int fd, struct stat *buf)
 565 {
 566         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 567         BY_HANDLE_FILE_INFORMATION fdata;
 568
 569         if (fh == INVALID_HANDLE_VALUE) {
 570                 errno = EBADF;
 571                 return -1;
 572         }
 573         /* direct non-file handles to MS's fstat() */
 574         if (GetFileType(fh) != FILE_TYPE_DISK)
 575                 return _fstati64(fd, buf);
 576
 577         if (GetFileInformationByHandle(fh, &fdata)) {
 578                 buf->st_ino = 0;
 579                 buf->st_gid = 0;
 580                 buf->st_uid = 0;
 581                 buf->st_nlink = 1;
 582                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 583                 buf->st_size = fdata.nFileSizeLow |
 584                         (((off_t)fdata.nFileSizeHigh)<<32);
 585                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 586                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 587                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 588                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 589                 return 0;
 590         }
 591         errno = EBADF;
 592         return -1;
 593 }
 594
 595 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 596 {
 597         long long winTime = t * 10000000LL + 116444736000000000LL;
 598         ft->dwLowDateTime = winTime;
 599         ft->dwHighDateTime = winTime >> 32;
 600 }
 601
 602 int mingw_utime (const char *file_name, const struct utimbuf *times)
 603 {
 604         FILETIME mft, aft;
 605         int fh, rc;
 606         DWORD attrs;
 607         wchar_t wfilename[MAX_PATH];
 608         if (xutftowcs_path(wfilename, file_name) < 0)
 609                 return -1;
 610
 611         /* must have write permission */
 612         attrs = GetFileAttributesW(wfilename);
 613         if (attrs != INVALID_FILE_ATTRIBUTES &&
 614             (attrs & FILE_ATTRIBUTE_READONLY)) {
 615                 /* ignore errors here; open() will report them */
 616                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 617         }
 618
 619         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 620                 rc = -1;
 621                 goto revert_attrs;
 622         }
 623
 624         if (times) {
 625                 time_t_to_filetime(times->modtime, &mft);
 626                 time_t_to_filetime(times->actime, &aft);
 627         } else {
 628                 GetSystemTimeAsFileTime(&mft);
 629                 aft = mft;
 630         }
 631         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 632                 errno = EINVAL;
 633                 rc = -1;
 634         } else
 635                 rc = 0;
 636         close(fh);
 637
 638 revert_attrs:
 639         if (attrs != INVALID_FILE_ATTRIBUTES &&
 640             (attrs & FILE_ATTRIBUTE_READONLY)) {
 641                 /* ignore errors again */
 642                 SetFileAttributesW(wfilename, attrs);
 643         }
 644         return rc;
 645 }
 646
 647 unsigned int sleep (unsigned int seconds)
 648 {
 649         Sleep(seconds*1000);
 650         return 0;
 651 }
 652
 653 char *mingw_mktemp(char *template)
 654 {
 655         wchar_t wtemplate[MAX_PATH];
 656         if (xutftowcs_path(wtemplate, template) < 0)
 657                 return NULL;
 658         if (!_wmktemp(wtemplate))
 659                 return NULL;
 660         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 661                 return NULL;
 662         return template;
 663 }
 664
 665 int mkstemp(char *template)
 666 {
 667         char *filename = mktemp(template);
 668         if (filename == NULL)
 669                 return -1;
 670         return open(filename, O_RDWR | O_CREAT, 0600);
 671 }
 672
 673 int gettimeofday(struct timeval *tv, void *tz)
 674 {
 675         FILETIME ft;
 676         long long hnsec;
 677
 678         GetSystemTimeAsFileTime(&ft);
 679         hnsec = filetime_to_hnsec(&ft);
 680         tv->tv_sec = hnsec / 10000000;
 681         tv->tv_usec = (hnsec % 10000000) / 10;
 682         return 0;
 683 }
 684
 685 int pipe(int filedes[2])
 686 {
 687         HANDLE h[2];
 688
 689         /* this creates non-inheritable handles */
 690         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 691                 errno = err_win_to_posix(GetLastError());
 692                 return -1;
 693         }
 694         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 695         if (filedes[0] < 0) {
 696                 CloseHandle(h[0]);
 697                 CloseHandle(h[1]);
 698                 return -1;
 699         }
 700         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 701         if (filedes[1] < 0) {
 702                 close(filedes[0]);
 703                 CloseHandle(h[1]);
 704                 return -1;
 705         }
 706         return 0;
 707 }
 708
 709 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 710 {
 711         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 712         memcpy(result, gmtime(timep), sizeof(struct tm));
 713         return result;
 714 }
 715
 716 struct tm *localtime_r(const time_t *timep, struct tm *result)
 717 {
 718         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 719         memcpy(result, localtime(timep), sizeof(struct tm));
 720         return result;
 721 }
 722
 723 char *mingw_getcwd(char *pointer, int len)
 724 {
 725         int i;
 726         wchar_t wpointer[MAX_PATH];
 727         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 728                 return NULL;
 729         if (xwcstoutf(pointer, wpointer, len) < 0)
 730                 return NULL;
 731         for (i = 0; pointer[i]; i++)
 732                 if (pointer[i] == '\\')
 733                         pointer[i] = '/';
 734         return pointer;
 735 }
 736
 737 /*
 738  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 739  * (Parsing C++ Command-Line Arguments)
 740  */
 741 static const char *quote_arg(const char *arg)
 742 {
 743         /* count chars to quote */
 744         int len = 0, n = 0;
 745         int force_quotes = 0;
 746         char *q, *d;
 747         const char *p = arg;
 748         if (!*p) force_quotes = 1;
 749         while (*p) {
 750                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 751                         force_quotes = 1;
 752                 else if (*p == '"')
 753                         n++;
 754                 else if (*p == '\\') {
 755                         int count = 0;
 756                         while (*p == '\\') {
 757                                 count++;
 758                                 p++;
 759                                 len++;
 760                         }
 761                         if (*p == '"')
 762                                 n += count*2 + 1;
 763                         continue;
 764                 }
 765                 len++;
 766                 p++;
 767         }
 768         if (!force_quotes && n == 0)
 769                 return arg;
 770
 771         /* insert \ where necessary */
 772         d = q = xmalloc(len+n+3);
 773         *d++ = '"';
 774         while (*arg) {
 775                 if (*arg == '"')
 776                         *d++ = '\\';
 777                 else if (*arg == '\\') {
 778                         int count = 0;
 779                         while (*arg == '\\') {
 780                                 count++;
 781                                 *d++ = *arg++;
 782                         }
 783                         if (*arg == '"') {
 784                                 while (count-- > 0)
 785                                         *d++ = '\\';
 786                                 *d++ = '\\';
 787                         }
 788                 }
 789                 *d++ = *arg++;
 790         }
 791         *d++ = '"';
 792         *d++ = 0;
 793         return q;
 794 }
 795
 796 static const char *parse_interpreter(const char *cmd)
 797 {
 798         static char buf[100];
 799         char *p, *opt;
 800         int n, fd;
 801
 802         /* don't even try a .exe */
 803         n = strlen(cmd);
 804         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 805                 return NULL;
 806
 807         fd = open(cmd, O_RDONLY);
 808         if (fd < 0)
 809                 return NULL;
 810         n = read(fd, buf, sizeof(buf)-1);
 811         close(fd);
 812         if (n < 4)      /* at least '#!/x' and not error */
 813                 return NULL;
 814
 815         if (buf[0] != '#' || buf[1] != '!')
 816                 return NULL;
 817         buf[n] = '\0';
 818         p = buf + strcspn(buf, "\r\n");
 819         if (!*p)
 820                 return NULL;
 821
 822         *p = '\0';
 823         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 824                 return NULL;
 825         /* strip options */
 826         if ((opt = strchr(p+1, ' ')))
 827                 *opt = '\0';
 828         return p+1;
 829 }
 830
 831 /*
 832  * Splits the PATH into parts.
 833  */
 834 static char **get_path_split(void)
 835 {
 836         char *p, **path, *envpath = mingw_getenv("PATH");
 837         int i, n = 0;
 838
 839         if (!envpath || !*envpath)
 840                 return NULL;
 841
 842         envpath = xstrdup(envpath);
 843         p = envpath;
 844         while (p) {
 845                 char *dir = p;
 846                 p = strchr(p, ';');
 847                 if (p) *p++ = '\0';
 848                 if (*dir) {     /* not earlier, catches series of ; */
 849                         ++n;
 850                 }
 851         }
 852         if (!n)
 853                 return NULL;
 854
 855         path = xmalloc((n+1)*sizeof(char *));
 856         p = envpath;
 857         i = 0;
 858         do {
 859                 if (*p)
 860                         path[i++] = xstrdup(p);
 861                 p = p+strlen(p)+1;
 862         } while (i < n);
 863         path[i] = NULL;
 864
 865         free(envpath);
 866
 867         return path;
 868 }
 869
 870 static void free_path_split(char **path)
 871 {
 872         char **p = path;
 873
 874         if (!path)
 875                 return;
 876
 877         while (*p)
 878                 free(*p++);
 879         free(path);
 880 }
 881
 882 /*
 883  * exe_only means that we only want to detect .exe files, but not scripts
 884  * (which do not have an extension)
 885  */
 886 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 887 {
 888         char path[MAX_PATH];
 889         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 890
 891         if (!isexe && access(path, F_OK) == 0)
 892                 return xstrdup(path);
 893         path[strlen(path)-4] = '\0';
 894         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 895                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 896                         return xstrdup(path);
 897         return NULL;
 898 }
 899
 900 /*
 901  * Determines the absolute path of cmd using the split path in path.
 902  * If cmd contains a slash or backslash, no lookup is performed.
 903  */
 904 static char *path_lookup(const char *cmd, char **path, int exe_only)
 905 {
 906         char *prog = NULL;
 907         int len = strlen(cmd);
 908         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 909
 910         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 911                 prog = xstrdup(cmd);
 912
 913         while (!prog && *path)
 914                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 915
 916         return prog;
 917 }
 918
 919 static int do_putenv(char **env, const char *name, int size, int free_old);
 920
 921 /* used number of elements of environ array, including terminating NULL */
 922 static int environ_size = 0;
 923 /* allocated size of environ array, in bytes */
 924 static int environ_alloc = 0;
 925
 926 /*
 927  * Create environment block suitable for CreateProcess. Merges current
 928  * process environment and the supplied environment changes.
 929  */
 930 static wchar_t *make_environment_block(char **deltaenv)
 931 {
 932         wchar_t *wenvblk = NULL;
 933         char **tmpenv;
 934         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
 935
 936         while (deltaenv && deltaenv[i])
 937                 i++;
 938
 939         /* copy the environment, leaving space for changes */
 940         tmpenv = xmalloc((size + i) * sizeof(char*));
 941         memcpy(tmpenv, environ, size * sizeof(char*));
 942
 943         /* merge supplied environment changes into the temporary environment */
 944         for (i = 0; deltaenv && deltaenv[i]; i++)
 945                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
 946
 947         /* create environment block from temporary environment */
 948         for (i = 0; tmpenv[i]; i++) {
 949                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
 950                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
 951                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
 952         }
 953         /* add final \0 terminator */
 954         wenvblk[wenvpos] = 0;
 955         free(tmpenv);
 956         return wenvblk;
 957 }
 958
 959 struct pinfo_t {
 960         struct pinfo_t *next;
 961         pid_t pid;
 962         HANDLE proc;
 963 };
 964 static struct pinfo_t *pinfo = NULL;
 965 CRITICAL_SECTION pinfo_cs;
 966
 967 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
 968                               const char *dir,
 969                               int prepend_cmd, int fhin, int fhout, int fherr)
 970 {
 971         STARTUPINFOW si;
 972         PROCESS_INFORMATION pi;
 973         struct strbuf args;
 974         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
 975         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
 976         BOOL ret;
 977
 978         /* Determine whether or not we are associated to a console */
 979         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 980                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 981                         FILE_ATTRIBUTE_NORMAL, NULL);
 982         if (cons == INVALID_HANDLE_VALUE) {
 983                 /* There is no console associated with this process.
 984                  * Since the child is a console process, Windows
 985                  * would normally create a console window. But
 986                  * since we'll be redirecting std streams, we do
 987                  * not need the console.
 988                  * It is necessary to use DETACHED_PROCESS
 989                  * instead of CREATE_NO_WINDOW to make ssh
 990                  * recognize that it has no console.
 991                  */
 992                 flags |= DETACHED_PROCESS;
 993         } else {
 994                 /* There is already a console. If we specified
 995                  * DETACHED_PROCESS here, too, Windows would
 996                  * disassociate the child from the console.
 997                  * The same is true for CREATE_NO_WINDOW.
 998                  * Go figure!
 999                  */
1000                 CloseHandle(cons);
1001         }
1002         memset(&si, 0, sizeof(si));
1003         si.cb = sizeof(si);
1004         si.dwFlags = STARTF_USESTDHANDLES;
1005         si.hStdInput = winansi_get_osfhandle(fhin);
1006         si.hStdOutput = winansi_get_osfhandle(fhout);
1007         si.hStdError = winansi_get_osfhandle(fherr);
1008
1009         if (xutftowcs_path(wcmd, cmd) < 0)
1010                 return -1;
1011         if (dir && xutftowcs_path(wdir, dir) < 0)
1012                 return -1;
1013
1014         /* concatenate argv, quoting args as we go */
1015         strbuf_init(&args, 0);
1016         if (prepend_cmd) {
1017                 char *quoted = (char *)quote_arg(cmd);
1018                 strbuf_addstr(&args, quoted);
1019                 if (quoted != cmd)
1020                         free(quoted);
1021         }
1022         for (; *argv; argv++) {
1023                 char *quoted = (char *)quote_arg(*argv);
1024                 if (*args.buf)
1025                         strbuf_addch(&args, ' ');
1026                 strbuf_addstr(&args, quoted);
1027                 if (quoted != *argv)
1028                         free(quoted);
1029         }
1030
1031         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1032         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1033         strbuf_release(&args);
1034
1035         wenvblk = make_environment_block(deltaenv);
1036
1037         memset(&pi, 0, sizeof(pi));
1038         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1039                 wenvblk, dir ? wdir : NULL, &si, &pi);
1040
1041         free(wenvblk);
1042         free(wargs);
1043
1044         if (!ret) {
1045                 errno = ENOENT;
1046                 return -1;
1047         }
1048         CloseHandle(pi.hThread);
1049
1050         /*
1051          * The process ID is the human-readable identifier of the process
1052          * that we want to present in log and error messages. The handle
1053          * is not useful for this purpose. But we cannot close it, either,
1054          * because it is not possible to turn a process ID into a process
1055          * handle after the process terminated.
1056          * Keep the handle in a list for waitpid.
1057          */
1058         EnterCriticalSection(&pinfo_cs);
1059         {
1060                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1061                 info->pid = pi.dwProcessId;
1062                 info->proc = pi.hProcess;
1063                 info->next = pinfo;
1064                 pinfo = info;
1065         }
1066         LeaveCriticalSection(&pinfo_cs);
1067
1068         return (pid_t)pi.dwProcessId;
1069 }
1070
1071 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1072 {
1073         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1074 }
1075
1076 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1077                      const char *dir,
1078                      int fhin, int fhout, int fherr)
1079 {
1080         pid_t pid;
1081         char **path = get_path_split();
1082         char *prog = path_lookup(cmd, path, 0);
1083
1084         if (!prog) {
1085                 errno = ENOENT;
1086                 pid = -1;
1087         }
1088         else {
1089                 const char *interpr = parse_interpreter(prog);
1090
1091                 if (interpr) {
1092                         const char *argv0 = argv[0];
1093                         char *iprog = path_lookup(interpr, path, 1);
1094                         argv[0] = prog;
1095                         if (!iprog) {
1096                                 errno = ENOENT;
1097                                 pid = -1;
1098                         }
1099                         else {
1100                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1101                                                        fhin, fhout, fherr);
1102                                 free(iprog);
1103                         }
1104                         argv[0] = argv0;
1105                 }
1106                 else
1107                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1108                                                fhin, fhout, fherr);
1109                 free(prog);
1110         }
1111         free_path_split(path);
1112         return pid;
1113 }
1114
1115 static int try_shell_exec(const char *cmd, char *const *argv)
1116 {
1117         const char *interpr = parse_interpreter(cmd);
1118         char **path;
1119         char *prog;
1120         int pid = 0;
1121
1122         if (!interpr)
1123                 return 0;
1124         path = get_path_split();
1125         prog = path_lookup(interpr, path, 1);
1126         if (prog) {
1127                 int argc = 0;
1128                 const char **argv2;
1129                 while (argv[argc]) argc++;
1130                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1131                 argv2[0] = (char *)cmd; /* full path to the script file */
1132                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1133                 pid = mingw_spawnv(prog, argv2, 1);
1134                 if (pid >= 0) {
1135                         int status;
1136                         if (waitpid(pid, &status, 0) < 0)
1137                                 status = 255;
1138                         exit(status);
1139                 }
1140                 pid = 1;        /* indicate that we tried but failed */
1141                 free(prog);
1142                 free(argv2);
1143         }
1144         free_path_split(path);
1145         return pid;
1146 }
1147
1148 int mingw_execv(const char *cmd, char *const *argv)
1149 {
1150         /* check if git_command is a shell script */
1151         if (!try_shell_exec(cmd, argv)) {
1152                 int pid, status;
1153
1154                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1155                 if (pid < 0)
1156                         return -1;
1157                 if (waitpid(pid, &status, 0) < 0)
1158                         status = 255;
1159                 exit(status);
1160         }
1161         return -1;
1162 }
1163
1164 int mingw_execvp(const char *cmd, char *const *argv)
1165 {
1166         char **path = get_path_split();
1167         char *prog = path_lookup(cmd, path, 0);
1168
1169         if (prog) {
1170                 mingw_execv(prog, argv);
1171                 free(prog);
1172         } else
1173                 errno = ENOENT;
1174
1175         free_path_split(path);
1176         return -1;
1177 }
1178
1179 int mingw_kill(pid_t pid, int sig)
1180 {
1181         if (pid > 0 && sig == SIGTERM) {
1182                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1183
1184                 if (TerminateProcess(h, -1)) {
1185                         CloseHandle(h);
1186                         return 0;
1187                 }
1188
1189                 errno = err_win_to_posix(GetLastError());
1190                 CloseHandle(h);
1191                 return -1;
1192         } else if (pid > 0 && sig == 0) {
1193                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1194                 if (h) {
1195                         CloseHandle(h);
1196                         return 0;
1197                 }
1198         }
1199
1200         errno = EINVAL;
1201         return -1;
1202 }
1203
1204 /*
1205  * Compare environment entries by key (i.e. stopping at '=' or '\0').
1206  */
1207 static int compareenv(const void *v1, const void *v2)
1208 {
1209         const char *e1 = *(const char**)v1;
1210         const char *e2 = *(const char**)v2;
1211
1212         for (;;) {
1213                 int c1 = *e1++;
1214                 int c2 = *e2++;
1215                 c1 = (c1 == '=') ? 0 : tolower(c1);
1216                 c2 = (c2 == '=') ? 0 : tolower(c2);
1217                 if (c1 > c2)
1218                         return 1;
1219                 if (c1 < c2)
1220                         return -1;
1221                 if (c1 == 0)
1222                         return 0;
1223         }
1224 }
1225
1226 static int bsearchenv(char **env, const char *name, size_t size)
1227 {
1228         unsigned low = 0, high = size;
1229         while (low < high) {
1230                 unsigned mid = low + ((high - low) >> 1);
1231                 int cmp = compareenv(&env[mid], &name);
1232                 if (cmp < 0)
1233                         low = mid + 1;
1234                 else if (cmp > 0)
1235                         high = mid;
1236                 else
1237                         return mid;
1238         }
1239         return ~low; /* not found, return 1's complement of insert position */
1240 }
1241
1242 /*
1243  * If name contains '=', then sets the variable, otherwise it unsets it
1244  * Size includes the terminating NULL. Env must have room for size + 1 entries
1245  * (in case of insert). Returns the new size. Optionally frees removed entries.
1246  */
1247 static int do_putenv(char **env, const char *name, int size, int free_old)
1248 {
1249         int i = bsearchenv(env, name, size - 1);
1250
1251         /* optionally free removed / replaced entry */
1252         if (i >= 0 && free_old)
1253                 free(env[i]);
1254
1255         if (strchr(name, '=')) {
1256                 /* if new value ('key=value') is specified, insert or replace entry */
1257                 if (i < 0) {
1258                         i = ~i;
1259                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1260                         size++;
1261                 }
1262                 env[i] = (char*) name;
1263         } else if (i >= 0) {
1264                 /* otherwise ('key') remove existing entry */
1265                 size--;
1266                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1267         }
1268         return size;
1269 }
1270
1271 char *mingw_getenv(const char *name)
1272 {
1273         char *value;
1274         int pos = bsearchenv(environ, name, environ_size - 1);
1275         if (pos < 0)
1276                 return NULL;
1277         value = strchr(environ[pos], '=');
1278         return value ? &value[1] : NULL;
1279 }
1280
1281 int mingw_putenv(const char *namevalue)
1282 {
1283         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1284         environ_size = do_putenv(environ, namevalue, environ_size, 1);
1285         return 0;
1286 }
1287
1288 /*
1289  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1290  * that service contains a numerical port, or that it is null. It
1291  * does a simple search using gethostbyname, and returns one IPv4 host
1292  * if one was found.
1293  */
1294 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1295                                    const struct addrinfo *hints,
1296                                    struct addrinfo **res)
1297 {
1298         struct hostent *h = NULL;
1299         struct addrinfo *ai;
1300         struct sockaddr_in *sin;
1301
1302         if (node) {
1303                 h = gethostbyname(node);
1304                 if (!h)
1305                         return WSAGetLastError();
1306         }
1307
1308         ai = xmalloc(sizeof(struct addrinfo));
1309         *res = ai;
1310         ai->ai_flags = 0;
1311         ai->ai_family = AF_INET;
1312         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1313         switch (ai->ai_socktype) {
1314         case SOCK_STREAM:
1315                 ai->ai_protocol = IPPROTO_TCP;
1316                 break;
1317         case SOCK_DGRAM:
1318                 ai->ai_protocol = IPPROTO_UDP;
1319                 break;
1320         default:
1321                 ai->ai_protocol = 0;
1322                 break;
1323         }
1324         ai->ai_addrlen = sizeof(struct sockaddr_in);
1325         if (hints && (hints->ai_flags & AI_CANONNAME))
1326                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1327         else
1328                 ai->ai_canonname = NULL;
1329
1330         sin = xcalloc(1, ai->ai_addrlen);
1331         sin->sin_family = AF_INET;
1332         /* Note: getaddrinfo is supposed to allow service to be a string,
1333          * which should be looked up using getservbyname. This is
1334          * currently not implemented */
1335         if (service)
1336                 sin->sin_port = htons(atoi(service));
1337         if (h)
1338                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1339         else if (hints && (hints->ai_flags & AI_PASSIVE))
1340                 sin->sin_addr.s_addr = INADDR_ANY;
1341         else
1342                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1343         ai->ai_addr = (struct sockaddr *)sin;
1344         ai->ai_next = NULL;
1345         return 0;
1346 }
1347
1348 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1349 {
1350         free(res->ai_canonname);
1351         free(res->ai_addr);
1352         free(res);
1353 }
1354
1355 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1356                                    char *host, DWORD hostlen,
1357                                    char *serv, DWORD servlen, int flags)
1358 {
1359         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1360         if (sa->sa_family != AF_INET)
1361                 return EAI_FAMILY;
1362         if (!host && !serv)
1363                 return EAI_NONAME;
1364
1365         if (host && hostlen > 0) {
1366                 struct hostent *ent = NULL;
1367                 if (!(flags & NI_NUMERICHOST))
1368                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1369                                             sizeof(sin->sin_addr), AF_INET);
1370
1371                 if (ent)
1372                         snprintf(host, hostlen, "%s", ent->h_name);
1373                 else if (flags & NI_NAMEREQD)
1374                         return EAI_NONAME;
1375                 else
1376                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1377         }
1378
1379         if (serv && servlen > 0) {
1380                 struct servent *ent = NULL;
1381                 if (!(flags & NI_NUMERICSERV))
1382                         ent = getservbyport(sin->sin_port,
1383                                             flags & NI_DGRAM ? "udp" : "tcp");
1384
1385                 if (ent)
1386                         snprintf(serv, servlen, "%s", ent->s_name);
1387                 else
1388                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1389         }
1390
1391         return 0;
1392 }
1393
1394 static HMODULE ipv6_dll = NULL;
1395 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1396 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1397                                       const struct addrinfo *hints,
1398                                       struct addrinfo **res);
1399 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1400                                       char *host, DWORD hostlen,
1401                                       char *serv, DWORD servlen, int flags);
1402 /*
1403  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1404  * don't need to try to load that one dynamically.
1405  */
1406
1407 static void socket_cleanup(void)
1408 {
1409         WSACleanup();
1410         if (ipv6_dll)
1411                 FreeLibrary(ipv6_dll);
1412         ipv6_dll = NULL;
1413         ipv6_freeaddrinfo = freeaddrinfo_stub;
1414         ipv6_getaddrinfo = getaddrinfo_stub;
1415         ipv6_getnameinfo = getnameinfo_stub;
1416 }
1417
1418 static void ensure_socket_initialization(void)
1419 {
1420         WSADATA wsa;
1421         static int initialized = 0;
1422         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1423         const char **name;
1424
1425         if (initialized)
1426                 return;
1427
1428         if (WSAStartup(MAKEWORD(2,2), &wsa))
1429                 die("unable to initialize winsock subsystem, error %d",
1430                         WSAGetLastError());
1431
1432         for (name = libraries; *name; name++) {
1433                 ipv6_dll = LoadLibrary(*name);
1434                 if (!ipv6_dll)
1435                         continue;
1436
1437                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1438                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1439                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1440                                                    const struct addrinfo *,
1441                                                    struct addrinfo **))
1442                         GetProcAddress(ipv6_dll, "getaddrinfo");
1443                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1444                                                    socklen_t, char *, DWORD,
1445                                                    char *, DWORD, int))
1446                         GetProcAddress(ipv6_dll, "getnameinfo");
1447                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1448                         FreeLibrary(ipv6_dll);
1449                         ipv6_dll = NULL;
1450                 } else
1451                         break;
1452         }
1453         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1454                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1455                 ipv6_getaddrinfo = getaddrinfo_stub;
1456                 ipv6_getnameinfo = getnameinfo_stub;
1457         }
1458
1459         atexit(socket_cleanup);
1460         initialized = 1;
1461 }
1462
1463 #undef gethostname
1464 int mingw_gethostname(char *name, int namelen)
1465 {
1466     ensure_socket_initialization();
1467     return gethostname(name, namelen);
1468 }
1469
1470 #undef gethostbyname
1471 struct hostent *mingw_gethostbyname(const char *host)
1472 {
1473         ensure_socket_initialization();
1474         return gethostbyname(host);
1475 }
1476
1477 void mingw_freeaddrinfo(struct addrinfo *res)
1478 {
1479         ipv6_freeaddrinfo(res);
1480 }
1481
1482 int mingw_getaddrinfo(const char *node, const char *service,
1483                       const struct addrinfo *hints, struct addrinfo **res)
1484 {
1485         ensure_socket_initialization();
1486         return ipv6_getaddrinfo(node, service, hints, res);
1487 }
1488
1489 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1490                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1491                       int flags)
1492 {
1493         ensure_socket_initialization();
1494         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1495 }
1496
1497 int mingw_socket(int domain, int type, int protocol)
1498 {
1499         int sockfd;
1500         SOCKET s;
1501
1502         ensure_socket_initialization();
1503         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1504         if (s == INVALID_SOCKET) {
1505                 /*
1506                  * WSAGetLastError() values are regular BSD error codes
1507                  * biased by WSABASEERR.
1508                  * However, strerror() does not know about networking
1509                  * specific errors, which are values beginning at 38 or so.
1510                  * Therefore, we choose to leave the biased error code
1511                  * in errno so that _if_ someone looks up the code somewhere,
1512                  * then it is at least the number that are usually listed.
1513                  */
1514                 errno = WSAGetLastError();
1515                 return -1;
1516         }
1517         /* convert into a file descriptor */
1518         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1519                 closesocket(s);
1520                 return error("unable to make a socket file descriptor: %s",
1521                         strerror(errno));
1522         }
1523         return sockfd;
1524 }
1525
1526 #undef connect
1527 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1528 {
1529         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1530         return connect(s, sa, sz);
1531 }
1532
1533 #undef bind
1534 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1535 {
1536         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1537         return bind(s, sa, sz);
1538 }
1539
1540 #undef setsockopt
1541 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1542 {
1543         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1544         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1545 }
1546
1547 #undef shutdown
1548 int mingw_shutdown(int sockfd, int how)
1549 {
1550         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1551         return shutdown(s, how);
1552 }
1553
1554 #undef listen
1555 int mingw_listen(int sockfd, int backlog)
1556 {
1557         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1558         return listen(s, backlog);
1559 }
1560
1561 #undef accept
1562 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1563 {
1564         int sockfd2;
1565
1566         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1567         SOCKET s2 = accept(s1, sa, sz);
1568
1569         /* convert into a file descriptor */
1570         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1571                 int err = errno;
1572                 closesocket(s2);
1573                 return error("unable to make a socket file descriptor: %s",
1574                         strerror(err));
1575         }
1576         return sockfd2;
1577 }
1578
1579 #undef rename
1580 int mingw_rename(const char *pold, const char *pnew)
1581 {
1582         DWORD attrs, gle;
1583         int tries = 0;
1584         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1585         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1586                 return -1;
1587
1588         /*
1589          * Try native rename() first to get errno right.
1590          * It is based on MoveFile(), which cannot overwrite existing files.
1591          */
1592         if (!_wrename(wpold, wpnew))
1593                 return 0;
1594         if (errno != EEXIST)
1595                 return -1;
1596 repeat:
1597         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1598                 return 0;
1599         /* TODO: translate more errors */
1600         gle = GetLastError();
1601         if (gle == ERROR_ACCESS_DENIED &&
1602             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1603                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1604                         errno = EISDIR;
1605                         return -1;
1606                 }
1607                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1608                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1609                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1610                                 return 0;
1611                         gle = GetLastError();
1612                         /* revert file attributes on failure */
1613                         SetFileAttributesW(wpnew, attrs);
1614                 }
1615         }
1616         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1617                 /*
1618                  * We assume that some other process had the source or
1619                  * destination file open at the wrong moment and retry.
1620                  * In order to give the other process a higher chance to
1621                  * complete its operation, we give up our time slice now.
1622                  * If we have to retry again, we do sleep a bit.
1623                  */
1624                 Sleep(delay[tries]);
1625                 tries++;
1626                 goto repeat;
1627         }
1628         if (gle == ERROR_ACCESS_DENIED &&
1629                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1630                        "Should I try again?", pold, pnew))
1631                 goto repeat;
1632
1633         errno = EACCES;
1634         return -1;
1635 }
1636
1637 /*
1638  * Note that this doesn't return the actual pagesize, but
1639  * the allocation granularity. If future Windows specific git code
1640  * needs the real getpagesize function, we need to find another solution.
1641  */
1642 int mingw_getpagesize(void)
1643 {
1644         SYSTEM_INFO si;
1645         GetSystemInfo(&si);
1646         return si.dwAllocationGranularity;
1647 }
1648
1649 struct passwd *getpwuid(int uid)
1650 {
1651         static char user_name[100];
1652         static struct passwd p;
1653
1654         DWORD len = sizeof(user_name);
1655         if (!GetUserName(user_name, &len))
1656                 return NULL;
1657         p.pw_name = user_name;
1658         p.pw_gecos = "unknown";
1659         p.pw_dir = NULL;
1660         return &p;
1661 }
1662
1663 static HANDLE timer_event;
1664 static HANDLE timer_thread;
1665 static int timer_interval;
1666 static int one_shot;
1667 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1668
1669 /* The timer works like this:
1670  * The thread, ticktack(), is a trivial routine that most of the time
1671  * only waits to receive the signal to terminate. The main thread tells
1672  * the thread to terminate by setting the timer_event to the signalled
1673  * state.
1674  * But ticktack() interrupts the wait state after the timer's interval
1675  * length to call the signal handler.
1676  */
1677
1678 static unsigned __stdcall ticktack(void *dummy)
1679 {
1680         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1681                 mingw_raise(SIGALRM);
1682                 if (one_shot)
1683                         break;
1684         }
1685         return 0;
1686 }
1687
1688 static int start_timer_thread(void)
1689 {
1690         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1691         if (timer_event) {
1692                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1693                 if (!timer_thread )
1694                         return errno = ENOMEM,
1695                                 error("cannot start timer thread");
1696         } else
1697                 return errno = ENOMEM,
1698                         error("cannot allocate resources for timer");
1699         return 0;
1700 }
1701
1702 static void stop_timer_thread(void)
1703 {
1704         if (timer_event)
1705                 SetEvent(timer_event);  /* tell thread to terminate */
1706         if (timer_thread) {
1707                 int rc = WaitForSingleObject(timer_thread, 1000);
1708                 if (rc == WAIT_TIMEOUT)
1709                         error("timer thread did not terminate timely");
1710                 else if (rc != WAIT_OBJECT_0)
1711                         error("waiting for timer thread failed: %lu",
1712                               GetLastError());
1713                 CloseHandle(timer_thread);
1714         }
1715         if (timer_event)
1716                 CloseHandle(timer_event);
1717         timer_event = NULL;
1718         timer_thread = NULL;
1719 }
1720
1721 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1722 {
1723         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1724 }
1725
1726 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1727 {
1728         static const struct timeval zero;
1729         static int atexit_done;
1730
1731         if (out != NULL)
1732                 return errno = EINVAL,
1733                         error("setitimer param 3 != NULL not implemented");
1734         if (!is_timeval_eq(&in->it_interval, &zero) &&
1735             !is_timeval_eq(&in->it_interval, &in->it_value))
1736                 return errno = EINVAL,
1737                         error("setitimer: it_interval must be zero or eq it_value");
1738
1739         if (timer_thread)
1740                 stop_timer_thread();
1741
1742         if (is_timeval_eq(&in->it_value, &zero) &&
1743             is_timeval_eq(&in->it_interval, &zero))
1744                 return 0;
1745
1746         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1747         one_shot = is_timeval_eq(&in->it_interval, &zero);
1748         if (!atexit_done) {
1749                 atexit(stop_timer_thread);
1750                 atexit_done = 1;
1751         }
1752         return start_timer_thread();
1753 }
1754
1755 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1756 {
1757         if (sig != SIGALRM)
1758                 return errno = EINVAL,
1759                         error("sigaction only implemented for SIGALRM");
1760         if (out != NULL)
1761                 return errno = EINVAL,
1762                         error("sigaction: param 3 != NULL not implemented");
1763
1764         timer_fn = in->sa_handler;
1765         return 0;
1766 }
1767
1768 #undef signal
1769 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1770 {
1771         sig_handler_t old;
1772
1773         switch (sig) {
1774         case SIGALRM:
1775                 old = timer_fn;
1776                 timer_fn = handler;
1777                 break;
1778
1779         case SIGINT:
1780                 old = sigint_fn;
1781                 sigint_fn = handler;
1782                 break;
1783
1784         default:
1785                 return signal(sig, handler);
1786         }
1787
1788         return old;
1789 }
1790
1791 #undef raise
1792 int mingw_raise(int sig)
1793 {
1794         switch (sig) {
1795         case SIGALRM:
1796                 if (timer_fn == SIG_DFL) {
1797                         if (isatty(STDERR_FILENO))
1798                                 fputs("Alarm clock\n", stderr);
1799                         exit(128 + SIGALRM);
1800                 } else if (timer_fn != SIG_IGN)
1801                         timer_fn(SIGALRM);
1802                 return 0;
1803
1804         case SIGINT:
1805                 if (sigint_fn == SIG_DFL)
1806                         exit(128 + SIGINT);
1807                 else if (sigint_fn != SIG_IGN)
1808                         sigint_fn(SIGINT);
1809                 return 0;
1810
1811         default:
1812                 return raise(sig);
1813         }
1814 }
1815
1816
1817 static const char *make_backslash_path(const char *path)
1818 {
1819         static char buf[PATH_MAX + 1];
1820         char *c;
1821
1822         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1823                 die("Too long path: %.*s", 60, path);
1824
1825         for (c = buf; *c; c++) {
1826                 if (*c == '/')
1827                         *c = '\\';
1828         }
1829         return buf;
1830 }
1831
1832 void mingw_open_html(const char *unixpath)
1833 {
1834         const char *htmlpath = make_backslash_path(unixpath);
1835         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1836                         const char *, const char *, const char *, INT);
1837         T ShellExecute;
1838         HMODULE shell32;
1839         int r;
1840
1841         shell32 = LoadLibrary("shell32.dll");
1842         if (!shell32)
1843                 die("cannot load shell32.dll");
1844         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1845         if (!ShellExecute)
1846                 die("cannot run browser");
1847
1848         printf("Launching default browser to display HTML ...\n");
1849         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1850         FreeLibrary(shell32);
1851         /* see the MSDN documentation referring to the result codes here */
1852         if (r <= 32) {
1853                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1854         }
1855 }
1856
1857 int link(const char *oldpath, const char *newpath)
1858 {
1859         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1860         static T create_hard_link = NULL;
1861         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1862         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1863                 xutftowcs_path(wnewpath, newpath) < 0)
1864                 return -1;
1865
1866         if (!create_hard_link) {
1867                 create_hard_link = (T) GetProcAddress(
1868                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1869                 if (!create_hard_link)
1870                         create_hard_link = (T)-1;
1871         }
1872         if (create_hard_link == (T)-1) {
1873                 errno = ENOSYS;
1874                 return -1;
1875         }
1876         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1877                 errno = err_win_to_posix(GetLastError());
1878                 return -1;
1879         }
1880         return 0;
1881 }
1882
1883 pid_t waitpid(pid_t pid, int *status, int options)
1884 {
1885         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1886             FALSE, pid);
1887         if (!h) {
1888                 errno = ECHILD;
1889                 return -1;
1890         }
1891
1892         if (pid > 0 && options & WNOHANG) {
1893                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1894                         CloseHandle(h);
1895                         return 0;
1896                 }
1897                 options &= ~WNOHANG;
1898         }
1899
1900         if (options == 0) {
1901                 struct pinfo_t **ppinfo;
1902                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1903                         CloseHandle(h);
1904                         return 0;
1905                 }
1906
1907                 if (status)
1908                         GetExitCodeProcess(h, (LPDWORD)status);
1909
1910                 EnterCriticalSection(&pinfo_cs);
1911
1912                 ppinfo = &pinfo;
1913                 while (*ppinfo) {
1914                         struct pinfo_t *info = *ppinfo;
1915                         if (info->pid == pid) {
1916                                 CloseHandle(info->proc);
1917                                 *ppinfo = info->next;
1918                                 free(info);
1919                                 break;
1920                         }
1921                         ppinfo = &info->next;
1922                 }
1923
1924                 LeaveCriticalSection(&pinfo_cs);
1925
1926                 CloseHandle(h);
1927                 return pid;
1928         }
1929         CloseHandle(h);
1930
1931         errno = EINVAL;
1932         return -1;
1933 }
1934
1935 int mingw_offset_1st_component(const char *path)
1936 {
1937         int offset = 0;
1938         if (has_dos_drive_prefix(path))
1939                 offset = 2;
1940
1941         /* unc paths */
1942         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1943
1944                 /* skip server name */
1945                 char *pos = strpbrk(path + 2, "\\/");
1946                 if (!pos)
1947                         return 0; /* Error: malformed unc path */
1948
1949                 do {
1950                         pos++;
1951                 } while (*pos && !is_dir_sep(*pos));
1952
1953                 offset = pos - path;
1954         }
1955
1956         return offset + is_dir_sep(path[offset]);
1957 }
1958
1959 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1960 {
1961         int upos = 0, wpos = 0;
1962         const unsigned char *utf = (const unsigned char*) utfs;
1963         if (!utf || !wcs || wcslen < 1) {
1964                 errno = EINVAL;
1965                 return -1;
1966         }
1967         /* reserve space for \0 */
1968         wcslen--;
1969         if (utflen < 0)
1970                 utflen = INT_MAX;
1971
1972         while (upos < utflen) {
1973                 int c = utf[upos++] & 0xff;
1974                 if (utflen == INT_MAX && c == 0)
1975                         break;
1976
1977                 if (wpos >= wcslen) {
1978                         wcs[wpos] = 0;
1979                         errno = ERANGE;
1980                         return -1;
1981                 }
1982
1983                 if (c < 0x80) {
1984                         /* ASCII */
1985                         wcs[wpos++] = c;
1986                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1987                                 (utf[upos] & 0xc0) == 0x80) {
1988                         /* 2-byte utf-8 */
1989                         c = ((c & 0x1f) << 6);
1990                         c |= (utf[upos++] & 0x3f);
1991                         wcs[wpos++] = c;
1992                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1993                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1994                                 (utf[upos] & 0xc0) == 0x80 &&
1995                                 (utf[upos + 1] & 0xc0) == 0x80) {
1996                         /* 3-byte utf-8 */
1997                         c = ((c & 0x0f) << 12);
1998                         c |= ((utf[upos++] & 0x3f) << 6);
1999                         c |= (utf[upos++] & 0x3f);
2000                         wcs[wpos++] = c;
2001                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2002                                 wpos + 1 < wcslen &&
2003                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2004                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2005                                 (utf[upos] & 0xc0) == 0x80 &&
2006                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2007                                 (utf[upos + 2] & 0xc0) == 0x80) {
2008                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2009                         c = ((c & 0x07) << 18);
2010                         c |= ((utf[upos++] & 0x3f) << 12);
2011                         c |= ((utf[upos++] & 0x3f) << 6);
2012                         c |= (utf[upos++] & 0x3f);
2013                         c -= 0x10000;
2014                         wcs[wpos++] = 0xd800 | (c >> 10);
2015                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2016                 } else if (c >= 0xa0) {
2017                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2018                         wcs[wpos++] = c;
2019                 } else {
2020                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2021                         static const char *hex = "0123456789abcdef";
2022                         wcs[wpos++] = hex[c >> 4];
2023                         if (wpos < wcslen)
2024                                 wcs[wpos++] = hex[c & 0x0f];
2025                 }
2026         }
2027         wcs[wpos] = 0;
2028         return wpos;
2029 }
2030
2031 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2032 {
2033         if (!wcs || !utf || utflen < 1) {
2034                 errno = EINVAL;
2035                 return -1;
2036         }
2037         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2038         if (utflen)
2039                 return utflen - 1;
2040         errno = ERANGE;
2041         return -1;
2042 }
2043
2044 /*
2045  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2046  * mingw startup code, see init.c in mingw runtime).
2047  */
2048 int _CRT_glob = 0;
2049
2050 typedef struct {
2051         int newmode;
2052 } _startupinfo;
2053
2054 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2055                 _startupinfo *si);
2056
2057 static NORETURN void die_startup()
2058 {
2059         fputs("fatal: not enough memory for initialization", stderr);
2060         exit(128);
2061 }
2062
2063 static void *malloc_startup(size_t size)
2064 {
2065         void *result = malloc(size);
2066         if (!result)
2067                 die_startup();
2068         return result;
2069 }
2070
2071 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2072 {
2073         len = xwcstoutf(buffer, wcs, len) + 1;
2074         return memcpy(malloc_startup(len), buffer, len);
2075 }
2076
2077 void mingw_startup()
2078 {
2079         int i, maxlen, argc;
2080         char *buffer;
2081         wchar_t **wenv, **wargv;
2082         _startupinfo si;
2083
2084         /* get wide char arguments and environment */
2085         si.newmode = 0;
2086         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2087                 die_startup();
2088
2089         /* determine size of argv and environ conversion buffer */
2090         maxlen = wcslen(_wpgmptr);
2091         for (i = 1; i < argc; i++)
2092                 maxlen = max(maxlen, wcslen(wargv[i]));
2093         for (i = 0; wenv[i]; i++)
2094                 maxlen = max(maxlen, wcslen(wenv[i]));
2095
2096         /*
2097          * nedmalloc can't free CRT memory, allocate resizable environment
2098          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2099          * use it while initializing the environment itself.
2100          */
2101         environ_size = i + 1;
2102         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2103         environ = malloc_startup(environ_alloc);
2104
2105         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2106         maxlen = 3 * maxlen + 1;
2107         buffer = malloc_startup(maxlen);
2108
2109         /* convert command line arguments and environment to UTF-8 */
2110         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2111         for (i = 1; i < argc; i++)
2112                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2113         for (i = 0; wenv[i]; i++)
2114                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2115         environ[i] = NULL;
2116         free(buffer);
2117
2118         /* sort environment for O(log n) getenv / putenv */
2119         qsort(environ, i, sizeof(char*), compareenv);
2120
2121         /* fix Windows specific environment settings */
2122
2123         /* on Windows it is TMP and TEMP */
2124         if (!mingw_getenv("TMPDIR")) {
2125                 const char *tmp = mingw_getenv("TMP");
2126                 if (!tmp)
2127                         tmp = mingw_getenv("TEMP");
2128                 if (tmp)
2129                         setenv("TMPDIR", tmp, 1);
2130         }
2131
2132         /* simulate TERM to enable auto-color (see color.c) */
2133         if (!getenv("TERM"))
2134                 setenv("TERM", "cygwin", 1);
2135
2136         /* initialize critical section for waitpid pinfo_t list */
2137         InitializeCriticalSection(&pinfo_cs);
2138
2139         /* set up default file mode and file modes for stdin/out/err */
2140         _fmode = _O_BINARY;
2141         _setmode(_fileno(stdin), _O_BINARY);
2142         _setmode(_fileno(stdout), _O_BINARY);
2143         _setmode(_fileno(stderr), _O_BINARY);
2144
2145         /* initialize Unicode console */
2146         winansi_init();
2147 }
2148
2149 int uname(struct utsname *buf)
2150 {
2151         unsigned v = (unsigned)GetVersion();
2152         memset(buf, 0, sizeof(*buf));
2153         xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2154         xsnprintf(buf->release, sizeof(buf->release),
2155                  "%u.%u", v & 0xff, (v >> 8) & 0xff);
2156         /* assuming NT variants only.. */
2157         xsnprintf(buf->version, sizeof(buf->version),
2158                   "%u", (v >> 16) & 0x7fff);
2159         return 0;
2160 }