compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <wchar.h>
   5 #include "../strbuf.h"
   6 #include "../run-command.h"
   7
   8 static const int delay[] = { 0, 1, 10, 20, 40 };
   9
  10 int err_win_to_posix(DWORD winerr)
  11 {
  12         int error = ENOSYS;
  13         switch(winerr) {
  14         case ERROR_ACCESS_DENIED: error = EACCES; break;
  15         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  16         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  17         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  18         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  19         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  20         case ERROR_BAD_COMMAND: error = EIO; break;
  21         case ERROR_BAD_DEVICE: error = ENODEV; break;
  22         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  23         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  24         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  25         case ERROR_BAD_LENGTH: error = EINVAL; break;
  26         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  27         case ERROR_BAD_PIPE: error = EPIPE; break;
  28         case ERROR_BAD_UNIT: error = ENODEV; break;
  29         case ERROR_BAD_USERNAME: error = EINVAL; break;
  30         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  31         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  32         case ERROR_BUSY: error = EBUSY; break;
  33         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  34         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  35         case ERROR_CANNOT_MAKE: error = EACCES; break;
  36         case ERROR_CANTOPEN: error = EIO; break;
  37         case ERROR_CANTREAD: error = EIO; break;
  38         case ERROR_CANTWRITE: error = EIO; break;
  39         case ERROR_CRC: error = EIO; break;
  40         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  41         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  42         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  43         case ERROR_DIRECTORY: error = EINVAL; break;
  44         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  45         case ERROR_DISK_CHANGE: error = EIO; break;
  46         case ERROR_DISK_FULL: error = ENOSPC; break;
  47         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  48         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  49         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  50         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  51         case ERROR_FILE_EXISTS: error = EEXIST; break;
  52         case ERROR_FILE_INVALID: error = ENODEV; break;
  53         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  54         case ERROR_GEN_FAILURE: error = EIO; break;
  55         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  56         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  57         case ERROR_INVALID_ACCESS: error = EACCES; break;
  58         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  59         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  60         case ERROR_INVALID_DATA: error = EINVAL; break;
  61         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  62         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  63         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  64         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  65         case ERROR_INVALID_HANDLE: error = EBADF; break;
  66         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  67         case ERROR_INVALID_NAME: error = EINVAL; break;
  68         case ERROR_INVALID_OWNER: error = EINVAL; break;
  69         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  70         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  71         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  72         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  73         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  74         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  75         case ERROR_IO_DEVICE: error = EIO; break;
  76         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  77         case ERROR_LOCKED: error = EBUSY; break;
  78         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  79         case ERROR_LOGON_FAILURE: error = EACCES; break;
  80         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  81         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  82         case ERROR_MORE_DATA: error = EPIPE; break;
  83         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  84         case ERROR_NOACCESS: error = EFAULT; break;
  85         case ERROR_NONE_MAPPED: error = EINVAL; break;
  86         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  87         case ERROR_NOT_READY: error = EAGAIN; break;
  88         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  89         case ERROR_NO_DATA: error = EPIPE; break;
  90         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  91         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  92         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  93         case ERROR_OPEN_FAILED: error = EIO; break;
  94         case ERROR_OPEN_FILES: error = EBUSY; break;
  95         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  96         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  97         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  98         case ERROR_PATH_BUSY: error = EBUSY; break;
  99         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 100         case ERROR_PIPE_BUSY: error = EBUSY; break;
 101         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 102         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 103         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 104         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 105         case ERROR_READ_FAULT: error = EIO; break;
 106         case ERROR_SEEK: error = EIO; break;
 107         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 108         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 109         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 110         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 111         case ERROR_SWAPERROR: error = ENOENT; break;
 112         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 113         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 114         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 115         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 116         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 117         case ERROR_WRITE_FAULT: error = EIO; break;
 118         case ERROR_WRITE_PROTECT: error = EROFS; break;
 119         }
 120         return error;
 121 }
 122
 123 static inline int is_file_in_use_error(DWORD errcode)
 124 {
 125         switch (errcode) {
 126         case ERROR_SHARING_VIOLATION:
 127         case ERROR_ACCESS_DENIED:
 128                 return 1;
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int read_yes_no_answer(void)
 135 {
 136         char answer[1024];
 137
 138         if (fgets(answer, sizeof(answer), stdin)) {
 139                 size_t answer_len = strlen(answer);
 140                 int got_full_line = 0, c;
 141
 142                 /* remove the newline */
 143                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 144                         answer[answer_len-2] = '\0';
 145                         got_full_line = 1;
 146                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 147                         answer[answer_len-1] = '\0';
 148                         got_full_line = 1;
 149                 }
 150                 /* flush the buffer in case we did not get the full line */
 151                 if (!got_full_line)
 152                         while ((c = getchar()) != EOF && c != '\n')
 153                                 ;
 154         } else
 155                 /* we could not read, return the
 156                  * default answer which is no */
 157                 return 0;
 158
 159         if (tolower(answer[0]) == 'y' && !answer[1])
 160                 return 1;
 161         if (!strncasecmp(answer, "yes", sizeof(answer)))
 162                 return 1;
 163         if (tolower(answer[0]) == 'n' && !answer[1])
 164                 return 0;
 165         if (!strncasecmp(answer, "no", sizeof(answer)))
 166                 return 0;
 167
 168         /* did not find an answer we understand */
 169         return -1;
 170 }
 171
 172 static int ask_yes_no_if_possible(const char *format, ...)
 173 {
 174         char question[4096];
 175         const char *retry_hook[] = { NULL, NULL, NULL };
 176         va_list args;
 177
 178         va_start(args, format);
 179         vsnprintf(question, sizeof(question), format, args);
 180         va_end(args);
 181
 182         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 183                 retry_hook[1] = question;
 184                 return !run_command_v_opt(retry_hook, 0);
 185         }
 186
 187         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 188                 return 0;
 189
 190         while (1) {
 191                 int answer;
 192                 fprintf(stderr, "%s (y/n) ", question);
 193
 194                 if ((answer = read_yes_no_answer()) >= 0)
 195                         return answer;
 196
 197                 fprintf(stderr, "Sorry, I did not understand your answer. "
 198                                 "Please type 'y' or 'n'\n");
 199         }
 200 }
 201
 202 int mingw_unlink(const char *pathname)
 203 {
 204         int ret, tries = 0;
 205         wchar_t wpathname[MAX_PATH];
 206         if (xutftowcs_path(wpathname, pathname) < 0)
 207                 return -1;
 208
 209         /* read-only files cannot be removed */
 210         _wchmod(wpathname, 0666);
 211         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 212                 if (!is_file_in_use_error(GetLastError()))
 213                         break;
 214                 /*
 215                  * We assume that some other process had the source or
 216                  * destination file open at the wrong moment and retry.
 217                  * In order to give the other process a higher chance to
 218                  * complete its operation, we give up our time slice now.
 219                  * If we have to retry again, we do sleep a bit.
 220                  */
 221                 Sleep(delay[tries]);
 222                 tries++;
 223         }
 224         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 225                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 226                         "Should I try again?", pathname))
 227                ret = _wunlink(wpathname);
 228         return ret;
 229 }
 230
 231 static int is_dir_empty(const wchar_t *wpath)
 232 {
 233         WIN32_FIND_DATAW findbuf;
 234         HANDLE handle;
 235         wchar_t wbuf[MAX_PATH + 2];
 236         wcscpy(wbuf, wpath);
 237         wcscat(wbuf, L"\\*");
 238         handle = FindFirstFileW(wbuf, &findbuf);
 239         if (handle == INVALID_HANDLE_VALUE)
 240                 return GetLastError() == ERROR_NO_MORE_FILES;
 241
 242         while (!wcscmp(findbuf.cFileName, L".") ||
 243                         !wcscmp(findbuf.cFileName, L".."))
 244                 if (!FindNextFileW(handle, &findbuf))
 245                         return GetLastError() == ERROR_NO_MORE_FILES;
 246         FindClose(handle);
 247         return 0;
 248 }
 249
 250 int mingw_rmdir(const char *pathname)
 251 {
 252         int ret, tries = 0;
 253         wchar_t wpathname[MAX_PATH];
 254         if (xutftowcs_path(wpathname, pathname) < 0)
 255                 return -1;
 256
 257         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 258                 if (!is_file_in_use_error(GetLastError()))
 259                         errno = err_win_to_posix(GetLastError());
 260                 if (errno != EACCES)
 261                         break;
 262                 if (!is_dir_empty(wpathname)) {
 263                         errno = ENOTEMPTY;
 264                         break;
 265                 }
 266                 /*
 267                  * We assume that some other process had the source or
 268                  * destination file open at the wrong moment and retry.
 269                  * In order to give the other process a higher chance to
 270                  * complete its operation, we give up our time slice now.
 271                  * If we have to retry again, we do sleep a bit.
 272                  */
 273                 Sleep(delay[tries]);
 274                 tries++;
 275         }
 276         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 277                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 278                         "Should I try again?", pathname))
 279                ret = _wrmdir(wpathname);
 280         return ret;
 281 }
 282
 283 int mingw_mkdir(const char *path, int mode)
 284 {
 285         int ret;
 286         wchar_t wpath[MAX_PATH];
 287         if (xutftowcs_path(wpath, path) < 0)
 288                 return -1;
 289         ret = _wmkdir(wpath);
 290         return ret;
 291 }
 292
 293 int mingw_open (const char *filename, int oflags, ...)
 294 {
 295         va_list args;
 296         unsigned mode;
 297         int fd;
 298         wchar_t wfilename[MAX_PATH];
 299
 300         va_start(args, oflags);
 301         mode = va_arg(args, int);
 302         va_end(args);
 303
 304         if (filename && !strcmp(filename, "/dev/null"))
 305                 filename = "nul";
 306
 307         if (xutftowcs_path(wfilename, filename) < 0)
 308                 return -1;
 309         fd = _wopen(wfilename, oflags, mode);
 310
 311         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 312                 DWORD attrs = GetFileAttributesW(wfilename);
 313                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 314                         errno = EISDIR;
 315         }
 316         return fd;
 317 }
 318
 319 #undef write
 320 ssize_t mingw_write(int fd, const void *buf, size_t count)
 321 {
 322         /*
 323          * While write() calls to a file on a local disk are translated
 324          * into WriteFile() calls with a maximum size of 64KB on Windows
 325          * XP and 256KB on Vista, no such cap is placed on writes to
 326          * files over the network on Windows XP.  Unfortunately, there
 327          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 328          * bigger writes fail on Windows XP.
 329          * So we cap to a nice 31MB here to avoid write failures over
 330          * the net without changing the number of WriteFile() calls in
 331          * the local case.
 332          */
 333         return write(fd, buf, min(count, 31 * 1024 * 1024));
 334 }
 335
 336 static BOOL WINAPI ctrl_ignore(DWORD type)
 337 {
 338         return TRUE;
 339 }
 340
 341 #undef fgetc
 342 int mingw_fgetc(FILE *stream)
 343 {
 344         int ch;
 345         if (!isatty(_fileno(stream)))
 346                 return fgetc(stream);
 347
 348         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 349         while (1) {
 350                 ch = fgetc(stream);
 351                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 352                         break;
 353
 354                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 355                 mingw_raise(SIGINT);
 356         }
 357         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 358         return ch;
 359 }
 360
 361 #undef fopen
 362 FILE *mingw_fopen (const char *filename, const char *otype)
 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 = _wfopen(wfilename, wotype);
 372         return file;
 373 }
 374
 375 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 376 {
 377         FILE *file;
 378         wchar_t wfilename[MAX_PATH], wotype[4];
 379         if (filename && !strcmp(filename, "/dev/null"))
 380                 filename = "nul";
 381         if (xutftowcs_path(wfilename, filename) < 0 ||
 382                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 383                 return NULL;
 384         file = _wfreopen(wfilename, wotype, stream);
 385         return file;
 386 }
 387
 388 #undef fflush
 389 int mingw_fflush(FILE *stream)
 390 {
 391         int ret = fflush(stream);
 392
 393         /*
 394          * write() is used behind the scenes of stdio output functions.
 395          * Since git code does not check for errors after each stdio write
 396          * operation, it can happen that write() is called by a later
 397          * stdio function even if an earlier write() call failed. In the
 398          * case of a pipe whose readable end was closed, only the first
 399          * call to write() reports EPIPE on Windows. Subsequent write()
 400          * calls report EINVAL. It is impossible to notice whether this
 401          * fflush invocation triggered such a case, therefore, we have to
 402          * catch all EINVAL errors whole-sale.
 403          */
 404         if (ret && errno == EINVAL)
 405                 errno = EPIPE;
 406
 407         return ret;
 408 }
 409
 410 int mingw_access(const char *filename, int mode)
 411 {
 412         wchar_t wfilename[MAX_PATH];
 413         if (xutftowcs_path(wfilename, filename) < 0)
 414                 return -1;
 415         /* X_OK is not supported by the MSVCRT version */
 416         return _waccess(wfilename, mode & ~X_OK);
 417 }
 418
 419 int mingw_chdir(const char *dirname)
 420 {
 421         wchar_t wdirname[MAX_PATH];
 422         if (xutftowcs_path(wdirname, dirname) < 0)
 423                 return -1;
 424         return _wchdir(wdirname);
 425 }
 426
 427 int mingw_chmod(const char *filename, int mode)
 428 {
 429         wchar_t wfilename[MAX_PATH];
 430         if (xutftowcs_path(wfilename, filename) < 0)
 431                 return -1;
 432         return _wchmod(wfilename, mode);
 433 }
 434
 435 /*
 436  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 437  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 438  */
 439 static inline long long filetime_to_hnsec(const FILETIME *ft)
 440 {
 441         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 442         /* Windows to Unix Epoch conversion */
 443         return winTime - 116444736000000000LL;
 444 }
 445
 446 static inline time_t filetime_to_time_t(const FILETIME *ft)
 447 {
 448         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 449 }
 450
 451 /* We keep the do_lstat code in a separate function to avoid recursion.
 452  * When a path ends with a slash, the stat will fail with ENOENT. In
 453  * this case, we strip the trailing slashes and stat again.
 454  *
 455  * If follow is true then act like stat() and report on the link
 456  * target. Otherwise report on the link itself.
 457  */
 458 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 459 {
 460         WIN32_FILE_ATTRIBUTE_DATA fdata;
 461         wchar_t wfilename[MAX_PATH];
 462         if (xutftowcs_path(wfilename, file_name) < 0)
 463                 return -1;
 464
 465         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 466                 buf->st_ino = 0;
 467                 buf->st_gid = 0;
 468                 buf->st_uid = 0;
 469                 buf->st_nlink = 1;
 470                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 471                 buf->st_size = fdata.nFileSizeLow |
 472                         (((off_t)fdata.nFileSizeHigh)<<32);
 473                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 474                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 475                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 476                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 477                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 478                         WIN32_FIND_DATAW findbuf;
 479                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 480                         if (handle != INVALID_HANDLE_VALUE) {
 481                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 482                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 483                                         if (follow) {
 484                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 485                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 486                                         } else {
 487                                                 buf->st_mode = S_IFLNK;
 488                                         }
 489                                         buf->st_mode |= S_IREAD;
 490                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 491                                                 buf->st_mode |= S_IWRITE;
 492                                 }
 493                                 FindClose(handle);
 494                         }
 495                 }
 496                 return 0;
 497         }
 498         switch (GetLastError()) {
 499         case ERROR_ACCESS_DENIED:
 500         case ERROR_SHARING_VIOLATION:
 501         case ERROR_LOCK_VIOLATION:
 502         case ERROR_SHARING_BUFFER_EXCEEDED:
 503                 errno = EACCES;
 504                 break;
 505         case ERROR_BUFFER_OVERFLOW:
 506                 errno = ENAMETOOLONG;
 507                 break;
 508         case ERROR_NOT_ENOUGH_MEMORY:
 509                 errno = ENOMEM;
 510                 break;
 511         default:
 512                 errno = ENOENT;
 513                 break;
 514         }
 515         return -1;
 516 }
 517
 518 /* We provide our own lstat/fstat functions, since the provided
 519  * lstat/fstat functions are so slow. These stat functions are
 520  * tailored for Git's usage (read: fast), and are not meant to be
 521  * complete. Note that Git stat()s are redirected to mingw_lstat()
 522  * too, since Windows doesn't really handle symlinks that well.
 523  */
 524 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 525 {
 526         int namelen;
 527         char alt_name[PATH_MAX];
 528
 529         if (!do_lstat(follow, file_name, buf))
 530                 return 0;
 531
 532         /* if file_name ended in a '/', Windows returned ENOENT;
 533          * try again without trailing slashes
 534          */
 535         if (errno != ENOENT)
 536                 return -1;
 537
 538         namelen = strlen(file_name);
 539         if (namelen && file_name[namelen-1] != '/')
 540                 return -1;
 541         while (namelen && file_name[namelen-1] == '/')
 542                 --namelen;
 543         if (!namelen || namelen >= PATH_MAX)
 544                 return -1;
 545
 546         memcpy(alt_name, file_name, namelen);
 547         alt_name[namelen] = 0;
 548         return do_lstat(follow, alt_name, buf);
 549 }
 550
 551 int mingw_lstat(const char *file_name, struct stat *buf)
 552 {
 553         return do_stat_internal(0, file_name, buf);
 554 }
 555 int mingw_stat(const char *file_name, struct stat *buf)
 556 {
 557         return do_stat_internal(1, file_name, buf);
 558 }
 559
 560 int mingw_fstat(int fd, struct stat *buf)
 561 {
 562         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 563         BY_HANDLE_FILE_INFORMATION fdata;
 564
 565         if (fh == INVALID_HANDLE_VALUE) {
 566                 errno = EBADF;
 567                 return -1;
 568         }
 569         /* direct non-file handles to MS's fstat() */
 570         if (GetFileType(fh) != FILE_TYPE_DISK)
 571                 return _fstati64(fd, buf);
 572
 573         if (GetFileInformationByHandle(fh, &fdata)) {
 574                 buf->st_ino = 0;
 575                 buf->st_gid = 0;
 576                 buf->st_uid = 0;
 577                 buf->st_nlink = 1;
 578                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 579                 buf->st_size = fdata.nFileSizeLow |
 580                         (((off_t)fdata.nFileSizeHigh)<<32);
 581                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 582                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 583                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 584                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 585                 return 0;
 586         }
 587         errno = EBADF;
 588         return -1;
 589 }
 590
 591 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 592 {
 593         long long winTime = t * 10000000LL + 116444736000000000LL;
 594         ft->dwLowDateTime = winTime;
 595         ft->dwHighDateTime = winTime >> 32;
 596 }
 597
 598 int mingw_utime (const char *file_name, const struct utimbuf *times)
 599 {
 600         FILETIME mft, aft;
 601         int fh, rc;
 602         DWORD attrs;
 603         wchar_t wfilename[MAX_PATH];
 604         if (xutftowcs_path(wfilename, file_name) < 0)
 605                 return -1;
 606
 607         /* must have write permission */
 608         attrs = GetFileAttributesW(wfilename);
 609         if (attrs != INVALID_FILE_ATTRIBUTES &&
 610             (attrs & FILE_ATTRIBUTE_READONLY)) {
 611                 /* ignore errors here; open() will report them */
 612                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 613         }
 614
 615         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 616                 rc = -1;
 617                 goto revert_attrs;
 618         }
 619
 620         if (times) {
 621                 time_t_to_filetime(times->modtime, &mft);
 622                 time_t_to_filetime(times->actime, &aft);
 623         } else {
 624                 GetSystemTimeAsFileTime(&mft);
 625                 aft = mft;
 626         }
 627         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 628                 errno = EINVAL;
 629                 rc = -1;
 630         } else
 631                 rc = 0;
 632         close(fh);
 633
 634 revert_attrs:
 635         if (attrs != INVALID_FILE_ATTRIBUTES &&
 636             (attrs & FILE_ATTRIBUTE_READONLY)) {
 637                 /* ignore errors again */
 638                 SetFileAttributesW(wfilename, attrs);
 639         }
 640         return rc;
 641 }
 642
 643 unsigned int sleep (unsigned int seconds)
 644 {
 645         Sleep(seconds*1000);
 646         return 0;
 647 }
 648
 649 char *mingw_mktemp(char *template)
 650 {
 651         wchar_t wtemplate[MAX_PATH];
 652         if (xutftowcs_path(wtemplate, template) < 0)
 653                 return NULL;
 654         if (!_wmktemp(wtemplate))
 655                 return NULL;
 656         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 657                 return NULL;
 658         return template;
 659 }
 660
 661 int mkstemp(char *template)
 662 {
 663         char *filename = mktemp(template);
 664         if (filename == NULL)
 665                 return -1;
 666         return open(filename, O_RDWR | O_CREAT, 0600);
 667 }
 668
 669 int gettimeofday(struct timeval *tv, void *tz)
 670 {
 671         FILETIME ft;
 672         long long hnsec;
 673
 674         GetSystemTimeAsFileTime(&ft);
 675         hnsec = filetime_to_hnsec(&ft);
 676         tv->tv_sec = hnsec / 10000000;
 677         tv->tv_usec = (hnsec % 10000000) / 10;
 678         return 0;
 679 }
 680
 681 int pipe(int filedes[2])
 682 {
 683         HANDLE h[2];
 684
 685         /* this creates non-inheritable handles */
 686         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 687                 errno = err_win_to_posix(GetLastError());
 688                 return -1;
 689         }
 690         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 691         if (filedes[0] < 0) {
 692                 CloseHandle(h[0]);
 693                 CloseHandle(h[1]);
 694                 return -1;
 695         }
 696         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 697         if (filedes[0] < 0) {
 698                 close(filedes[0]);
 699                 CloseHandle(h[1]);
 700                 return -1;
 701         }
 702         return 0;
 703 }
 704
 705 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 706 {
 707         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 708         memcpy(result, gmtime(timep), sizeof(struct tm));
 709         return result;
 710 }
 711
 712 struct tm *localtime_r(const time_t *timep, struct tm *result)
 713 {
 714         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 715         memcpy(result, localtime(timep), sizeof(struct tm));
 716         return result;
 717 }
 718
 719 char *mingw_getcwd(char *pointer, int len)
 720 {
 721         int i;
 722         wchar_t wpointer[MAX_PATH];
 723         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 724                 return NULL;
 725         if (xwcstoutf(pointer, wpointer, len) < 0)
 726                 return NULL;
 727         for (i = 0; pointer[i]; i++)
 728                 if (pointer[i] == '\\')
 729                         pointer[i] = '/';
 730         return pointer;
 731 }
 732
 733 #undef getenv
 734 char *mingw_getenv(const char *name)
 735 {
 736         char *result = getenv(name);
 737         if (!result && !strcmp(name, "TMPDIR")) {
 738                 /* on Windows it is TMP and TEMP */
 739                 result = getenv("TMP");
 740                 if (!result)
 741                         result = getenv("TEMP");
 742         }
 743         else if (!result && !strcmp(name, "TERM")) {
 744                 /* simulate TERM to enable auto-color (see color.c) */
 745                 result = "winansi";
 746         }
 747         return result;
 748 }
 749
 750 /*
 751  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 752  * (Parsing C++ Command-Line Arguments)
 753  */
 754 static const char *quote_arg(const char *arg)
 755 {
 756         /* count chars to quote */
 757         int len = 0, n = 0;
 758         int force_quotes = 0;
 759         char *q, *d;
 760         const char *p = arg;
 761         if (!*p) force_quotes = 1;
 762         while (*p) {
 763                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 764                         force_quotes = 1;
 765                 else if (*p == '"')
 766                         n++;
 767                 else if (*p == '\\') {
 768                         int count = 0;
 769                         while (*p == '\\') {
 770                                 count++;
 771                                 p++;
 772                                 len++;
 773                         }
 774                         if (*p == '"')
 775                                 n += count*2 + 1;
 776                         continue;
 777                 }
 778                 len++;
 779                 p++;
 780         }
 781         if (!force_quotes && n == 0)
 782                 return arg;
 783
 784         /* insert \ where necessary */
 785         d = q = xmalloc(len+n+3);
 786         *d++ = '"';
 787         while (*arg) {
 788                 if (*arg == '"')
 789                         *d++ = '\\';
 790                 else if (*arg == '\\') {
 791                         int count = 0;
 792                         while (*arg == '\\') {
 793                                 count++;
 794                                 *d++ = *arg++;
 795                         }
 796                         if (*arg == '"') {
 797                                 while (count-- > 0)
 798                                         *d++ = '\\';
 799                                 *d++ = '\\';
 800                         }
 801                 }
 802                 *d++ = *arg++;
 803         }
 804         *d++ = '"';
 805         *d++ = 0;
 806         return q;
 807 }
 808
 809 static const char *parse_interpreter(const char *cmd)
 810 {
 811         static char buf[100];
 812         char *p, *opt;
 813         int n, fd;
 814
 815         /* don't even try a .exe */
 816         n = strlen(cmd);
 817         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 818                 return NULL;
 819
 820         fd = open(cmd, O_RDONLY);
 821         if (fd < 0)
 822                 return NULL;
 823         n = read(fd, buf, sizeof(buf)-1);
 824         close(fd);
 825         if (n < 4)      /* at least '#!/x' and not error */
 826                 return NULL;
 827
 828         if (buf[0] != '#' || buf[1] != '!')
 829                 return NULL;
 830         buf[n] = '\0';
 831         p = buf + strcspn(buf, "\r\n");
 832         if (!*p)
 833                 return NULL;
 834
 835         *p = '\0';
 836         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 837                 return NULL;
 838         /* strip options */
 839         if ((opt = strchr(p+1, ' ')))
 840                 *opt = '\0';
 841         return p+1;
 842 }
 843
 844 /*
 845  * Splits the PATH into parts.
 846  */
 847 static char **get_path_split(void)
 848 {
 849         char *p, **path, *envpath = getenv("PATH");
 850         int i, n = 0;
 851
 852         if (!envpath || !*envpath)
 853                 return NULL;
 854
 855         envpath = xstrdup(envpath);
 856         p = envpath;
 857         while (p) {
 858                 char *dir = p;
 859                 p = strchr(p, ';');
 860                 if (p) *p++ = '\0';
 861                 if (*dir) {     /* not earlier, catches series of ; */
 862                         ++n;
 863                 }
 864         }
 865         if (!n)
 866                 return NULL;
 867
 868         path = xmalloc((n+1)*sizeof(char *));
 869         p = envpath;
 870         i = 0;
 871         do {
 872                 if (*p)
 873                         path[i++] = xstrdup(p);
 874                 p = p+strlen(p)+1;
 875         } while (i < n);
 876         path[i] = NULL;
 877
 878         free(envpath);
 879
 880         return path;
 881 }
 882
 883 static void free_path_split(char **path)
 884 {
 885         char **p = path;
 886
 887         if (!path)
 888                 return;
 889
 890         while (*p)
 891                 free(*p++);
 892         free(path);
 893 }
 894
 895 /*
 896  * exe_only means that we only want to detect .exe files, but not scripts
 897  * (which do not have an extension)
 898  */
 899 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 900 {
 901         char path[MAX_PATH];
 902         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 903
 904         if (!isexe && access(path, F_OK) == 0)
 905                 return xstrdup(path);
 906         path[strlen(path)-4] = '\0';
 907         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 908                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 909                         return xstrdup(path);
 910         return NULL;
 911 }
 912
 913 /*
 914  * Determines the absolute path of cmd using the split path in path.
 915  * If cmd contains a slash or backslash, no lookup is performed.
 916  */
 917 static char *path_lookup(const char *cmd, char **path, int exe_only)
 918 {
 919         char *prog = NULL;
 920         int len = strlen(cmd);
 921         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 922
 923         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 924                 prog = xstrdup(cmd);
 925
 926         while (!prog && *path)
 927                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 928
 929         return prog;
 930 }
 931
 932 static int env_compare(const void *a, const void *b)
 933 {
 934         char *const *ea = a;
 935         char *const *eb = b;
 936         return strcasecmp(*ea, *eb);
 937 }
 938
 939 struct pinfo_t {
 940         struct pinfo_t *next;
 941         pid_t pid;
 942         HANDLE proc;
 943 };
 944 static struct pinfo_t *pinfo = NULL;
 945 CRITICAL_SECTION pinfo_cs;
 946
 947 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 948                               const char *dir,
 949                               int prepend_cmd, int fhin, int fhout, int fherr)
 950 {
 951         STARTUPINFOW si;
 952         PROCESS_INFORMATION pi;
 953         struct strbuf args;
 954         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
 955         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
 956         BOOL ret;
 957
 958         /* Determine whether or not we are associated to a console */
 959         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 960                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 961                         FILE_ATTRIBUTE_NORMAL, NULL);
 962         if (cons == INVALID_HANDLE_VALUE) {
 963                 /* There is no console associated with this process.
 964                  * Since the child is a console process, Windows
 965                  * would normally create a console window. But
 966                  * since we'll be redirecting std streams, we do
 967                  * not need the console.
 968                  * It is necessary to use DETACHED_PROCESS
 969                  * instead of CREATE_NO_WINDOW to make ssh
 970                  * recognize that it has no console.
 971                  */
 972                 flags |= DETACHED_PROCESS;
 973         } else {
 974                 /* There is already a console. If we specified
 975                  * DETACHED_PROCESS here, too, Windows would
 976                  * disassociate the child from the console.
 977                  * The same is true for CREATE_NO_WINDOW.
 978                  * Go figure!
 979                  */
 980                 CloseHandle(cons);
 981         }
 982         memset(&si, 0, sizeof(si));
 983         si.cb = sizeof(si);
 984         si.dwFlags = STARTF_USESTDHANDLES;
 985         si.hStdInput = winansi_get_osfhandle(fhin);
 986         si.hStdOutput = winansi_get_osfhandle(fhout);
 987         si.hStdError = winansi_get_osfhandle(fherr);
 988
 989         if (xutftowcs_path(wcmd, cmd) < 0)
 990                 return -1;
 991         if (dir && xutftowcs_path(wdir, dir) < 0)
 992                 return -1;
 993
 994         /* concatenate argv, quoting args as we go */
 995         strbuf_init(&args, 0);
 996         if (prepend_cmd) {
 997                 char *quoted = (char *)quote_arg(cmd);
 998                 strbuf_addstr(&args, quoted);
 999                 if (quoted != cmd)
1000                         free(quoted);
1001         }
1002         for (; *argv; argv++) {
1003                 char *quoted = (char *)quote_arg(*argv);
1004                 if (*args.buf)
1005                         strbuf_addch(&args, ' ');
1006                 strbuf_addstr(&args, quoted);
1007                 if (quoted != *argv)
1008                         free(quoted);
1009         }
1010
1011         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1012         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1013         strbuf_release(&args);
1014
1015         if (env) {
1016                 int count = 0;
1017                 char **e, **sorted_env;
1018                 int size = 0, wenvsz = 0, wenvpos = 0;
1019
1020                 for (e = env; *e; e++)
1021                         count++;
1022
1023                 /* environment must be sorted */
1024                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
1025                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
1026                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
1027
1028                 /* create environment block from temporary environment */
1029                 for (e = sorted_env; *e; e++) {
1030                         size = 2 * strlen(*e) + 2; /* +2 for final \0 */
1031                         ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1032                         wenvpos += xutftowcs(&wenvblk[wenvpos], *e, size) + 1;
1033                 }
1034                 /* add final \0 terminator */
1035                 wenvblk[wenvpos] = 0;
1036                 free(sorted_env);
1037         }
1038
1039         memset(&pi, 0, sizeof(pi));
1040         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1041                 wenvblk, dir ? wdir : NULL, &si, &pi);
1042
1043         free(wenvblk);
1044         free(wargs);
1045
1046         if (!ret) {
1047                 errno = ENOENT;
1048                 return -1;
1049         }
1050         CloseHandle(pi.hThread);
1051
1052         /*
1053          * The process ID is the human-readable identifier of the process
1054          * that we want to present in log and error messages. The handle
1055          * is not useful for this purpose. But we cannot close it, either,
1056          * because it is not possible to turn a process ID into a process
1057          * handle after the process terminated.
1058          * Keep the handle in a list for waitpid.
1059          */
1060         EnterCriticalSection(&pinfo_cs);
1061         {
1062                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1063                 info->pid = pi.dwProcessId;
1064                 info->proc = pi.hProcess;
1065                 info->next = pinfo;
1066                 pinfo = info;
1067         }
1068         LeaveCriticalSection(&pinfo_cs);
1069
1070         return (pid_t)pi.dwProcessId;
1071 }
1072
1073 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
1074                            int prepend_cmd)
1075 {
1076         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
1077 }
1078
1079 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
1080                      const char *dir,
1081                      int fhin, int fhout, int fherr)
1082 {
1083         pid_t pid;
1084         char **path = get_path_split();
1085         char *prog = path_lookup(cmd, path, 0);
1086
1087         if (!prog) {
1088                 errno = ENOENT;
1089                 pid = -1;
1090         }
1091         else {
1092                 const char *interpr = parse_interpreter(prog);
1093
1094                 if (interpr) {
1095                         const char *argv0 = argv[0];
1096                         char *iprog = path_lookup(interpr, path, 1);
1097                         argv[0] = prog;
1098                         if (!iprog) {
1099                                 errno = ENOENT;
1100                                 pid = -1;
1101                         }
1102                         else {
1103                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1104                                                        fhin, fhout, fherr);
1105                                 free(iprog);
1106                         }
1107                         argv[0] = argv0;
1108                 }
1109                 else
1110                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1111                                                fhin, fhout, fherr);
1112                 free(prog);
1113         }
1114         free_path_split(path);
1115         return pid;
1116 }
1117
1118 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1119 {
1120         const char *interpr = parse_interpreter(cmd);
1121         char **path;
1122         char *prog;
1123         int pid = 0;
1124
1125         if (!interpr)
1126                 return 0;
1127         path = get_path_split();
1128         prog = path_lookup(interpr, path, 1);
1129         if (prog) {
1130                 int argc = 0;
1131                 const char **argv2;
1132                 while (argv[argc]) argc++;
1133                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1134                 argv2[0] = (char *)cmd; /* full path to the script file */
1135                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1136                 pid = mingw_spawnve(prog, argv2, env, 1);
1137                 if (pid >= 0) {
1138                         int status;
1139                         if (waitpid(pid, &status, 0) < 0)
1140                                 status = 255;
1141                         exit(status);
1142                 }
1143                 pid = 1;        /* indicate that we tried but failed */
1144                 free(prog);
1145                 free(argv2);
1146         }
1147         free_path_split(path);
1148         return pid;
1149 }
1150
1151 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1152 {
1153         /* check if git_command is a shell script */
1154         if (!try_shell_exec(cmd, argv, (char **)env)) {
1155                 int pid, status;
1156
1157                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1158                 if (pid < 0)
1159                         return;
1160                 if (waitpid(pid, &status, 0) < 0)
1161                         status = 255;
1162                 exit(status);
1163         }
1164 }
1165
1166 int mingw_execvp(const char *cmd, char *const *argv)
1167 {
1168         char **path = get_path_split();
1169         char *prog = path_lookup(cmd, path, 0);
1170
1171         if (prog) {
1172                 mingw_execve(prog, argv, environ);
1173                 free(prog);
1174         } else
1175                 errno = ENOENT;
1176
1177         free_path_split(path);
1178         return -1;
1179 }
1180
1181 int mingw_execv(const char *cmd, char *const *argv)
1182 {
1183         mingw_execve(cmd, argv, environ);
1184         return -1;
1185 }
1186
1187 int mingw_kill(pid_t pid, int sig)
1188 {
1189         if (pid > 0 && sig == SIGTERM) {
1190                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1191
1192                 if (TerminateProcess(h, -1)) {
1193                         CloseHandle(h);
1194                         return 0;
1195                 }
1196
1197                 errno = err_win_to_posix(GetLastError());
1198                 CloseHandle(h);
1199                 return -1;
1200         } else if (pid > 0 && sig == 0) {
1201                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1202                 if (h) {
1203                         CloseHandle(h);
1204                         return 0;
1205                 }
1206         }
1207
1208         errno = EINVAL;
1209         return -1;
1210 }
1211
1212 static char **copy_environ(void)
1213 {
1214         char **env;
1215         int i = 0;
1216         while (environ[i])
1217                 i++;
1218         env = xmalloc((i+1)*sizeof(*env));
1219         for (i = 0; environ[i]; i++)
1220                 env[i] = xstrdup(environ[i]);
1221         env[i] = NULL;
1222         return env;
1223 }
1224
1225 void free_environ(char **env)
1226 {
1227         int i;
1228         for (i = 0; env[i]; i++)
1229                 free(env[i]);
1230         free(env);
1231 }
1232
1233 static int lookup_env(char **env, const char *name, size_t nmln)
1234 {
1235         int i;
1236
1237         for (i = 0; env[i]; i++) {
1238                 if (!strncasecmp(env[i], name, nmln) && '=' == env[i][nmln])
1239                         /* matches */
1240                         return i;
1241         }
1242         return -1;
1243 }
1244
1245 /*
1246  * If name contains '=', then sets the variable, otherwise it unsets it
1247  */
1248 static char **env_setenv(char **env, const char *name)
1249 {
1250         char *eq = strchrnul(name, '=');
1251         int i = lookup_env(env, name, eq-name);
1252
1253         if (i < 0) {
1254                 if (*eq) {
1255                         for (i = 0; env[i]; i++)
1256                                 ;
1257                         env = xrealloc(env, (i+2)*sizeof(*env));
1258                         env[i] = (char*) name;
1259                         env[i+1] = NULL;
1260                 }
1261         }
1262         else {
1263                 free(env[i]);
1264                 if (*eq)
1265                         env[i] = (char*) name;
1266                 else
1267                         for (; env[i]; i++)
1268                                 env[i] = env[i+1];
1269         }
1270         return env;
1271 }
1272
1273 /*
1274  * Copies global environ and adjusts variables as specified by vars.
1275  */
1276 char **make_augmented_environ(const char *const *vars)
1277 {
1278         char **env = copy_environ();
1279
1280         while (*vars) {
1281                 const char *v = *vars++;
1282                 env = env_setenv(env, strchr(v, '=') ? xstrdup(v) : v);
1283         }
1284         return env;
1285 }
1286
1287 int mingw_putenv(const char *namevalue)
1288 {
1289         environ = env_setenv(environ, namevalue);
1290         return 0;
1291 }
1292
1293 /*
1294  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1295  * that service contains a numerical port, or that it is null. It
1296  * does a simple search using gethostbyname, and returns one IPv4 host
1297  * if one was found.
1298  */
1299 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1300                                    const struct addrinfo *hints,
1301                                    struct addrinfo **res)
1302 {
1303         struct hostent *h = NULL;
1304         struct addrinfo *ai;
1305         struct sockaddr_in *sin;
1306
1307         if (node) {
1308                 h = gethostbyname(node);
1309                 if (!h)
1310                         return WSAGetLastError();
1311         }
1312
1313         ai = xmalloc(sizeof(struct addrinfo));
1314         *res = ai;
1315         ai->ai_flags = 0;
1316         ai->ai_family = AF_INET;
1317         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1318         switch (ai->ai_socktype) {
1319         case SOCK_STREAM:
1320                 ai->ai_protocol = IPPROTO_TCP;
1321                 break;
1322         case SOCK_DGRAM:
1323                 ai->ai_protocol = IPPROTO_UDP;
1324                 break;
1325         default:
1326                 ai->ai_protocol = 0;
1327                 break;
1328         }
1329         ai->ai_addrlen = sizeof(struct sockaddr_in);
1330         if (hints && (hints->ai_flags & AI_CANONNAME))
1331                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1332         else
1333                 ai->ai_canonname = NULL;
1334
1335         sin = xmalloc(ai->ai_addrlen);
1336         memset(sin, 0, ai->ai_addrlen);
1337         sin->sin_family = AF_INET;
1338         /* Note: getaddrinfo is supposed to allow service to be a string,
1339          * which should be looked up using getservbyname. This is
1340          * currently not implemented */
1341         if (service)
1342                 sin->sin_port = htons(atoi(service));
1343         if (h)
1344                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1345         else if (hints && (hints->ai_flags & AI_PASSIVE))
1346                 sin->sin_addr.s_addr = INADDR_ANY;
1347         else
1348                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1349         ai->ai_addr = (struct sockaddr *)sin;
1350         ai->ai_next = NULL;
1351         return 0;
1352 }
1353
1354 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1355 {
1356         free(res->ai_canonname);
1357         free(res->ai_addr);
1358         free(res);
1359 }
1360
1361 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1362                                    char *host, DWORD hostlen,
1363                                    char *serv, DWORD servlen, int flags)
1364 {
1365         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1366         if (sa->sa_family != AF_INET)
1367                 return EAI_FAMILY;
1368         if (!host && !serv)
1369                 return EAI_NONAME;
1370
1371         if (host && hostlen > 0) {
1372                 struct hostent *ent = NULL;
1373                 if (!(flags & NI_NUMERICHOST))
1374                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1375                                             sizeof(sin->sin_addr), AF_INET);
1376
1377                 if (ent)
1378                         snprintf(host, hostlen, "%s", ent->h_name);
1379                 else if (flags & NI_NAMEREQD)
1380                         return EAI_NONAME;
1381                 else
1382                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1383         }
1384
1385         if (serv && servlen > 0) {
1386                 struct servent *ent = NULL;
1387                 if (!(flags & NI_NUMERICSERV))
1388                         ent = getservbyport(sin->sin_port,
1389                                             flags & NI_DGRAM ? "udp" : "tcp");
1390
1391                 if (ent)
1392                         snprintf(serv, servlen, "%s", ent->s_name);
1393                 else
1394                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1395         }
1396
1397         return 0;
1398 }
1399
1400 static HMODULE ipv6_dll = NULL;
1401 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1402 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1403                                       const struct addrinfo *hints,
1404                                       struct addrinfo **res);
1405 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1406                                       char *host, DWORD hostlen,
1407                                       char *serv, DWORD servlen, int flags);
1408 /*
1409  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1410  * don't need to try to load that one dynamically.
1411  */
1412
1413 static void socket_cleanup(void)
1414 {
1415         WSACleanup();
1416         if (ipv6_dll)
1417                 FreeLibrary(ipv6_dll);
1418         ipv6_dll = NULL;
1419         ipv6_freeaddrinfo = freeaddrinfo_stub;
1420         ipv6_getaddrinfo = getaddrinfo_stub;
1421         ipv6_getnameinfo = getnameinfo_stub;
1422 }
1423
1424 static void ensure_socket_initialization(void)
1425 {
1426         WSADATA wsa;
1427         static int initialized = 0;
1428         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1429         const char **name;
1430
1431         if (initialized)
1432                 return;
1433
1434         if (WSAStartup(MAKEWORD(2,2), &wsa))
1435                 die("unable to initialize winsock subsystem, error %d",
1436                         WSAGetLastError());
1437
1438         for (name = libraries; *name; name++) {
1439                 ipv6_dll = LoadLibrary(*name);
1440                 if (!ipv6_dll)
1441                         continue;
1442
1443                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1444                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1445                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1446                                                    const struct addrinfo *,
1447                                                    struct addrinfo **))
1448                         GetProcAddress(ipv6_dll, "getaddrinfo");
1449                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1450                                                    socklen_t, char *, DWORD,
1451                                                    char *, DWORD, int))
1452                         GetProcAddress(ipv6_dll, "getnameinfo");
1453                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1454                         FreeLibrary(ipv6_dll);
1455                         ipv6_dll = NULL;
1456                 } else
1457                         break;
1458         }
1459         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1460                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1461                 ipv6_getaddrinfo = getaddrinfo_stub;
1462                 ipv6_getnameinfo = getnameinfo_stub;
1463         }
1464
1465         atexit(socket_cleanup);
1466         initialized = 1;
1467 }
1468
1469 #undef gethostname
1470 int mingw_gethostname(char *name, int namelen)
1471 {
1472     ensure_socket_initialization();
1473     return gethostname(name, namelen);
1474 }
1475
1476 #undef gethostbyname
1477 struct hostent *mingw_gethostbyname(const char *host)
1478 {
1479         ensure_socket_initialization();
1480         return gethostbyname(host);
1481 }
1482
1483 void mingw_freeaddrinfo(struct addrinfo *res)
1484 {
1485         ipv6_freeaddrinfo(res);
1486 }
1487
1488 int mingw_getaddrinfo(const char *node, const char *service,
1489                       const struct addrinfo *hints, struct addrinfo **res)
1490 {
1491         ensure_socket_initialization();
1492         return ipv6_getaddrinfo(node, service, hints, res);
1493 }
1494
1495 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1496                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1497                       int flags)
1498 {
1499         ensure_socket_initialization();
1500         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1501 }
1502
1503 int mingw_socket(int domain, int type, int protocol)
1504 {
1505         int sockfd;
1506         SOCKET s;
1507
1508         ensure_socket_initialization();
1509         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1510         if (s == INVALID_SOCKET) {
1511                 /*
1512                  * WSAGetLastError() values are regular BSD error codes
1513                  * biased by WSABASEERR.
1514                  * However, strerror() does not know about networking
1515                  * specific errors, which are values beginning at 38 or so.
1516                  * Therefore, we choose to leave the biased error code
1517                  * in errno so that _if_ someone looks up the code somewhere,
1518                  * then it is at least the number that are usually listed.
1519                  */
1520                 errno = WSAGetLastError();
1521                 return -1;
1522         }
1523         /* convert into a file descriptor */
1524         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1525                 closesocket(s);
1526                 return error("unable to make a socket file descriptor: %s",
1527                         strerror(errno));
1528         }
1529         return sockfd;
1530 }
1531
1532 #undef connect
1533 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1534 {
1535         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1536         return connect(s, sa, sz);
1537 }
1538
1539 #undef bind
1540 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1541 {
1542         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1543         return bind(s, sa, sz);
1544 }
1545
1546 #undef setsockopt
1547 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1548 {
1549         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1550         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1551 }
1552
1553 #undef shutdown
1554 int mingw_shutdown(int sockfd, int how)
1555 {
1556         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1557         return shutdown(s, how);
1558 }
1559
1560 #undef listen
1561 int mingw_listen(int sockfd, int backlog)
1562 {
1563         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1564         return listen(s, backlog);
1565 }
1566
1567 #undef accept
1568 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1569 {
1570         int sockfd2;
1571
1572         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1573         SOCKET s2 = accept(s1, sa, sz);
1574
1575         /* convert into a file descriptor */
1576         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1577                 int err = errno;
1578                 closesocket(s2);
1579                 return error("unable to make a socket file descriptor: %s",
1580                         strerror(err));
1581         }
1582         return sockfd2;
1583 }
1584
1585 #undef rename
1586 int mingw_rename(const char *pold, const char *pnew)
1587 {
1588         DWORD attrs, gle;
1589         int tries = 0;
1590         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1591         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1592                 return -1;
1593
1594         /*
1595          * Try native rename() first to get errno right.
1596          * It is based on MoveFile(), which cannot overwrite existing files.
1597          */
1598         if (!_wrename(wpold, wpnew))
1599                 return 0;
1600         if (errno != EEXIST)
1601                 return -1;
1602 repeat:
1603         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1604                 return 0;
1605         /* TODO: translate more errors */
1606         gle = GetLastError();
1607         if (gle == ERROR_ACCESS_DENIED &&
1608             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1609                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1610                         errno = EISDIR;
1611                         return -1;
1612                 }
1613                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1614                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1615                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1616                                 return 0;
1617                         gle = GetLastError();
1618                         /* revert file attributes on failure */
1619                         SetFileAttributesW(wpnew, attrs);
1620                 }
1621         }
1622         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1623                 /*
1624                  * We assume that some other process had the source or
1625                  * destination file open at the wrong moment and retry.
1626                  * In order to give the other process a higher chance to
1627                  * complete its operation, we give up our time slice now.
1628                  * If we have to retry again, we do sleep a bit.
1629                  */
1630                 Sleep(delay[tries]);
1631                 tries++;
1632                 goto repeat;
1633         }
1634         if (gle == ERROR_ACCESS_DENIED &&
1635                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1636                        "Should I try again?", pold, pnew))
1637                 goto repeat;
1638
1639         errno = EACCES;
1640         return -1;
1641 }
1642
1643 /*
1644  * Note that this doesn't return the actual pagesize, but
1645  * the allocation granularity. If future Windows specific git code
1646  * needs the real getpagesize function, we need to find another solution.
1647  */
1648 int mingw_getpagesize(void)
1649 {
1650         SYSTEM_INFO si;
1651         GetSystemInfo(&si);
1652         return si.dwAllocationGranularity;
1653 }
1654
1655 struct passwd *getpwuid(int uid)
1656 {
1657         static char user_name[100];
1658         static struct passwd p;
1659
1660         DWORD len = sizeof(user_name);
1661         if (!GetUserName(user_name, &len))
1662                 return NULL;
1663         p.pw_name = user_name;
1664         p.pw_gecos = "unknown";
1665         p.pw_dir = NULL;
1666         return &p;
1667 }
1668
1669 static HANDLE timer_event;
1670 static HANDLE timer_thread;
1671 static int timer_interval;
1672 static int one_shot;
1673 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1674
1675 /* The timer works like this:
1676  * The thread, ticktack(), is a trivial routine that most of the time
1677  * only waits to receive the signal to terminate. The main thread tells
1678  * the thread to terminate by setting the timer_event to the signalled
1679  * state.
1680  * But ticktack() interrupts the wait state after the timer's interval
1681  * length to call the signal handler.
1682  */
1683
1684 static unsigned __stdcall ticktack(void *dummy)
1685 {
1686         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1687                 mingw_raise(SIGALRM);
1688                 if (one_shot)
1689                         break;
1690         }
1691         return 0;
1692 }
1693
1694 static int start_timer_thread(void)
1695 {
1696         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1697         if (timer_event) {
1698                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1699                 if (!timer_thread )
1700                         return errno = ENOMEM,
1701                                 error("cannot start timer thread");
1702         } else
1703                 return errno = ENOMEM,
1704                         error("cannot allocate resources for timer");
1705         return 0;
1706 }
1707
1708 static void stop_timer_thread(void)
1709 {
1710         if (timer_event)
1711                 SetEvent(timer_event);  /* tell thread to terminate */
1712         if (timer_thread) {
1713                 int rc = WaitForSingleObject(timer_thread, 1000);
1714                 if (rc == WAIT_TIMEOUT)
1715                         error("timer thread did not terminate timely");
1716                 else if (rc != WAIT_OBJECT_0)
1717                         error("waiting for timer thread failed: %lu",
1718                               GetLastError());
1719                 CloseHandle(timer_thread);
1720         }
1721         if (timer_event)
1722                 CloseHandle(timer_event);
1723         timer_event = NULL;
1724         timer_thread = NULL;
1725 }
1726
1727 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1728 {
1729         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1730 }
1731
1732 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1733 {
1734         static const struct timeval zero;
1735         static int atexit_done;
1736
1737         if (out != NULL)
1738                 return errno = EINVAL,
1739                         error("setitimer param 3 != NULL not implemented");
1740         if (!is_timeval_eq(&in->it_interval, &zero) &&
1741             !is_timeval_eq(&in->it_interval, &in->it_value))
1742                 return errno = EINVAL,
1743                         error("setitimer: it_interval must be zero or eq it_value");
1744
1745         if (timer_thread)
1746                 stop_timer_thread();
1747
1748         if (is_timeval_eq(&in->it_value, &zero) &&
1749             is_timeval_eq(&in->it_interval, &zero))
1750                 return 0;
1751
1752         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1753         one_shot = is_timeval_eq(&in->it_interval, &zero);
1754         if (!atexit_done) {
1755                 atexit(stop_timer_thread);
1756                 atexit_done = 1;
1757         }
1758         return start_timer_thread();
1759 }
1760
1761 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1762 {
1763         if (sig != SIGALRM)
1764                 return errno = EINVAL,
1765                         error("sigaction only implemented for SIGALRM");
1766         if (out != NULL)
1767                 return errno = EINVAL,
1768                         error("sigaction: param 3 != NULL not implemented");
1769
1770         timer_fn = in->sa_handler;
1771         return 0;
1772 }
1773
1774 #undef signal
1775 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1776 {
1777         sig_handler_t old;
1778
1779         switch (sig) {
1780         case SIGALRM:
1781                 old = timer_fn;
1782                 timer_fn = handler;
1783                 break;
1784
1785         case SIGINT:
1786                 old = sigint_fn;
1787                 sigint_fn = handler;
1788                 break;
1789
1790         default:
1791                 return signal(sig, handler);
1792         }
1793
1794         return old;
1795 }
1796
1797 #undef raise
1798 int mingw_raise(int sig)
1799 {
1800         switch (sig) {
1801         case SIGALRM:
1802                 if (timer_fn == SIG_DFL) {
1803                         if (isatty(STDERR_FILENO))
1804                                 fputs("Alarm clock\n", stderr);
1805                         exit(128 + SIGALRM);
1806                 } else if (timer_fn != SIG_IGN)
1807                         timer_fn(SIGALRM);
1808                 return 0;
1809
1810         case SIGINT:
1811                 if (sigint_fn == SIG_DFL)
1812                         exit(128 + SIGINT);
1813                 else if (sigint_fn != SIG_IGN)
1814                         sigint_fn(SIGINT);
1815                 return 0;
1816
1817         default:
1818                 return raise(sig);
1819         }
1820 }
1821
1822
1823 static const char *make_backslash_path(const char *path)
1824 {
1825         static char buf[PATH_MAX + 1];
1826         char *c;
1827
1828         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1829                 die("Too long path: %.*s", 60, path);
1830
1831         for (c = buf; *c; c++) {
1832                 if (*c == '/')
1833                         *c = '\\';
1834         }
1835         return buf;
1836 }
1837
1838 void mingw_open_html(const char *unixpath)
1839 {
1840         const char *htmlpath = make_backslash_path(unixpath);
1841         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1842                         const char *, const char *, const char *, INT);
1843         T ShellExecute;
1844         HMODULE shell32;
1845         int r;
1846
1847         shell32 = LoadLibrary("shell32.dll");
1848         if (!shell32)
1849                 die("cannot load shell32.dll");
1850         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1851         if (!ShellExecute)
1852                 die("cannot run browser");
1853
1854         printf("Launching default browser to display HTML ...\n");
1855         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1856         FreeLibrary(shell32);
1857         /* see the MSDN documentation referring to the result codes here */
1858         if (r <= 32) {
1859                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1860         }
1861 }
1862
1863 int link(const char *oldpath, const char *newpath)
1864 {
1865         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1866         static T create_hard_link = NULL;
1867         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1868         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1869                 xutftowcs_path(wnewpath, newpath) < 0)
1870                 return -1;
1871
1872         if (!create_hard_link) {
1873                 create_hard_link = (T) GetProcAddress(
1874                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1875                 if (!create_hard_link)
1876                         create_hard_link = (T)-1;
1877         }
1878         if (create_hard_link == (T)-1) {
1879                 errno = ENOSYS;
1880                 return -1;
1881         }
1882         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1883                 errno = err_win_to_posix(GetLastError());
1884                 return -1;
1885         }
1886         return 0;
1887 }
1888
1889 pid_t waitpid(pid_t pid, int *status, int options)
1890 {
1891         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1892             FALSE, pid);
1893         if (!h) {
1894                 errno = ECHILD;
1895                 return -1;
1896         }
1897
1898         if (pid > 0 && options & WNOHANG) {
1899                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1900                         CloseHandle(h);
1901                         return 0;
1902                 }
1903                 options &= ~WNOHANG;
1904         }
1905
1906         if (options == 0) {
1907                 struct pinfo_t **ppinfo;
1908                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1909                         CloseHandle(h);
1910                         return 0;
1911                 }
1912
1913                 if (status)
1914                         GetExitCodeProcess(h, (LPDWORD)status);
1915
1916                 EnterCriticalSection(&pinfo_cs);
1917
1918                 ppinfo = &pinfo;
1919                 while (*ppinfo) {
1920                         struct pinfo_t *info = *ppinfo;
1921                         if (info->pid == pid) {
1922                                 CloseHandle(info->proc);
1923                                 *ppinfo = info->next;
1924                                 free(info);
1925                                 break;
1926                         }
1927                         ppinfo = &info->next;
1928                 }
1929
1930                 LeaveCriticalSection(&pinfo_cs);
1931
1932                 CloseHandle(h);
1933                 return pid;
1934         }
1935         CloseHandle(h);
1936
1937         errno = EINVAL;
1938         return -1;
1939 }
1940
1941 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1942 {
1943         int upos = 0, wpos = 0;
1944         const unsigned char *utf = (const unsigned char*) utfs;
1945         if (!utf || !wcs || wcslen < 1) {
1946                 errno = EINVAL;
1947                 return -1;
1948         }
1949         /* reserve space for \0 */
1950         wcslen--;
1951         if (utflen < 0)
1952                 utflen = INT_MAX;
1953
1954         while (upos < utflen) {
1955                 int c = utf[upos++] & 0xff;
1956                 if (utflen == INT_MAX && c == 0)
1957                         break;
1958
1959                 if (wpos >= wcslen) {
1960                         wcs[wpos] = 0;
1961                         errno = ERANGE;
1962                         return -1;
1963                 }
1964
1965                 if (c < 0x80) {
1966                         /* ASCII */
1967                         wcs[wpos++] = c;
1968                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1969                                 (utf[upos] & 0xc0) == 0x80) {
1970                         /* 2-byte utf-8 */
1971                         c = ((c & 0x1f) << 6);
1972                         c |= (utf[upos++] & 0x3f);
1973                         wcs[wpos++] = c;
1974                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1975                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1976                                 (utf[upos] & 0xc0) == 0x80 &&
1977                                 (utf[upos + 1] & 0xc0) == 0x80) {
1978                         /* 3-byte utf-8 */
1979                         c = ((c & 0x0f) << 12);
1980                         c |= ((utf[upos++] & 0x3f) << 6);
1981                         c |= (utf[upos++] & 0x3f);
1982                         wcs[wpos++] = c;
1983                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
1984                                 wpos + 1 < wcslen &&
1985                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
1986                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
1987                                 (utf[upos] & 0xc0) == 0x80 &&
1988                                 (utf[upos + 1] & 0xc0) == 0x80 &&
1989                                 (utf[upos + 2] & 0xc0) == 0x80) {
1990                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
1991                         c = ((c & 0x07) << 18);
1992                         c |= ((utf[upos++] & 0x3f) << 12);
1993                         c |= ((utf[upos++] & 0x3f) << 6);
1994                         c |= (utf[upos++] & 0x3f);
1995                         c -= 0x10000;
1996                         wcs[wpos++] = 0xd800 | (c >> 10);
1997                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
1998                 } else if (c >= 0xa0) {
1999                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2000                         wcs[wpos++] = c;
2001                 } else {
2002                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2003                         static const char *hex = "0123456789abcdef";
2004                         wcs[wpos++] = hex[c >> 4];
2005                         if (wpos < wcslen)
2006                                 wcs[wpos++] = hex[c & 0x0f];
2007                 }
2008         }
2009         wcs[wpos] = 0;
2010         return wpos;
2011 }
2012
2013 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2014 {
2015         if (!wcs || !utf || utflen < 1) {
2016                 errno = EINVAL;
2017                 return -1;
2018         }
2019         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2020         if (utflen)
2021                 return utflen - 1;
2022         errno = ERANGE;
2023         return -1;
2024 }
2025
2026 /*
2027  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2028  * mingw startup code, see init.c in mingw runtime).
2029  */
2030 int _CRT_glob = 0;
2031
2032 typedef struct {
2033         int newmode;
2034 } _startupinfo;
2035
2036 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2037                 _startupinfo *si);
2038
2039 void mingw_startup()
2040 {
2041         int i, len, maxlen, argc;
2042         char *buffer;
2043         wchar_t **wenv, **wargv;
2044         _startupinfo si;
2045
2046         /* get wide char arguments and environment */
2047         si.newmode = 0;
2048         __wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si);
2049
2050         /* determine size of argv and environ conversion buffer */
2051         maxlen = wcslen(_wpgmptr);
2052         for (i = 1; i < argc; i++)
2053                 maxlen = max(maxlen, wcslen(wargv[i]));
2054         for (i = 0; wenv[i]; i++)
2055                 maxlen = max(maxlen, wcslen(wenv[i]));
2056
2057         /* nedmalloc can't free CRT memory, allocate resizable environment list */
2058         environ = xcalloc(i + 1, sizeof(char*));
2059
2060         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2061         maxlen = 3 * maxlen + 1;
2062         buffer = xmalloc(maxlen);
2063
2064         /* convert command line arguments and environment to UTF-8 */
2065         len = xwcstoutf(buffer, _wpgmptr, maxlen);
2066         __argv[0] = xmemdupz(buffer, len);
2067         for (i = 1; i < argc; i++) {
2068                 len = xwcstoutf(buffer, wargv[i], maxlen);
2069                 __argv[i] = xmemdupz(buffer, len);
2070         }
2071         for (i = 0; wenv[i]; i++) {
2072                 len = xwcstoutf(buffer, wenv[i], maxlen);
2073                 environ[i] = xmemdupz(buffer, len);
2074         }
2075         free(buffer);
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 }