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 unsigned int _CRT_fmode = _O_BINARY;
  11
  12 int err_win_to_posix(DWORD winerr)
  13 {
  14         int error = ENOSYS;
  15         switch(winerr) {
  16         case ERROR_ACCESS_DENIED: error = EACCES; break;
  17         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  18         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  19         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  20         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  21         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  22         case ERROR_BAD_COMMAND: error = EIO; break;
  23         case ERROR_BAD_DEVICE: error = ENODEV; break;
  24         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  25         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  27         case ERROR_BAD_LENGTH: error = EINVAL; break;
  28         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  29         case ERROR_BAD_PIPE: error = EPIPE; break;
  30         case ERROR_BAD_UNIT: error = ENODEV; break;
  31         case ERROR_BAD_USERNAME: error = EINVAL; break;
  32         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  33         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  34         case ERROR_BUSY: error = EBUSY; break;
  35         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  36         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  37         case ERROR_CANNOT_MAKE: error = EACCES; break;
  38         case ERROR_CANTOPEN: error = EIO; break;
  39         case ERROR_CANTREAD: error = EIO; break;
  40         case ERROR_CANTWRITE: error = EIO; break;
  41         case ERROR_CRC: error = EIO; break;
  42         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  43         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  44         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  45         case ERROR_DIRECTORY: error = EINVAL; break;
  46         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  47         case ERROR_DISK_CHANGE: error = EIO; break;
  48         case ERROR_DISK_FULL: error = ENOSPC; break;
  49         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  50         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  51         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  52         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  53         case ERROR_FILE_EXISTS: error = EEXIST; break;
  54         case ERROR_FILE_INVALID: error = ENODEV; break;
  55         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  56         case ERROR_GEN_FAILURE: error = EIO; break;
  57         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  58         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  59         case ERROR_INVALID_ACCESS: error = EACCES; break;
  60         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  61         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  62         case ERROR_INVALID_DATA: error = EINVAL; break;
  63         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  64         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  65         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  66         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  67         case ERROR_INVALID_HANDLE: error = EBADF; break;
  68         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  69         case ERROR_INVALID_NAME: error = EINVAL; break;
  70         case ERROR_INVALID_OWNER: error = EINVAL; break;
  71         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  72         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  73         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  74         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  75         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  76         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  77         case ERROR_IO_DEVICE: error = EIO; break;
  78         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  79         case ERROR_LOCKED: error = EBUSY; break;
  80         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  81         case ERROR_LOGON_FAILURE: error = EACCES; break;
  82         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  83         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  84         case ERROR_MORE_DATA: error = EPIPE; break;
  85         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  86         case ERROR_NOACCESS: error = EFAULT; break;
  87         case ERROR_NONE_MAPPED: error = EINVAL; break;
  88         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  89         case ERROR_NOT_READY: error = EAGAIN; break;
  90         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  91         case ERROR_NO_DATA: error = EPIPE; break;
  92         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  93         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  94         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  95         case ERROR_OPEN_FAILED: error = EIO; break;
  96         case ERROR_OPEN_FILES: error = EBUSY; break;
  97         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  98         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  99         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 100         case ERROR_PATH_BUSY: error = EBUSY; break;
 101         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 102         case ERROR_PIPE_BUSY: error = EBUSY; break;
 103         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 104         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 105         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 106         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 107         case ERROR_READ_FAULT: error = EIO; break;
 108         case ERROR_SEEK: error = EIO; break;
 109         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 110         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 111         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 112         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 113         case ERROR_SWAPERROR: error = ENOENT; break;
 114         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 115         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 116         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 117         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 118         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 119         case ERROR_WRITE_FAULT: error = EIO; break;
 120         case ERROR_WRITE_PROTECT: error = EROFS; break;
 121         }
 122         return error;
 123 }
 124
 125 static inline int is_file_in_use_error(DWORD errcode)
 126 {
 127         switch (errcode) {
 128         case ERROR_SHARING_VIOLATION:
 129         case ERROR_ACCESS_DENIED:
 130                 return 1;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static int read_yes_no_answer(void)
 137 {
 138         char answer[1024];
 139
 140         if (fgets(answer, sizeof(answer), stdin)) {
 141                 size_t answer_len = strlen(answer);
 142                 int got_full_line = 0, c;
 143
 144                 /* remove the newline */
 145                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 146                         answer[answer_len-2] = '\0';
 147                         got_full_line = 1;
 148                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 149                         answer[answer_len-1] = '\0';
 150                         got_full_line = 1;
 151                 }
 152                 /* flush the buffer in case we did not get the full line */
 153                 if (!got_full_line)
 154                         while ((c = getchar()) != EOF && c != '\n')
 155                                 ;
 156         } else
 157                 /* we could not read, return the
 158                  * default answer which is no */
 159                 return 0;
 160
 161         if (tolower(answer[0]) == 'y' && !answer[1])
 162                 return 1;
 163         if (!strncasecmp(answer, "yes", sizeof(answer)))
 164                 return 1;
 165         if (tolower(answer[0]) == 'n' && !answer[1])
 166                 return 0;
 167         if (!strncasecmp(answer, "no", sizeof(answer)))
 168                 return 0;
 169
 170         /* did not find an answer we understand */
 171         return -1;
 172 }
 173
 174 static int ask_yes_no_if_possible(const char *format, ...)
 175 {
 176         char question[4096];
 177         const char *retry_hook[] = { NULL, NULL, NULL };
 178         va_list args;
 179
 180         va_start(args, format);
 181         vsnprintf(question, sizeof(question), format, args);
 182         va_end(args);
 183
 184         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 185                 retry_hook[1] = question;
 186                 return !run_command_v_opt(retry_hook, 0);
 187         }
 188
 189         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 190                 return 0;
 191
 192         while (1) {
 193                 int answer;
 194                 fprintf(stderr, "%s (y/n) ", question);
 195
 196                 if ((answer = read_yes_no_answer()) >= 0)
 197                         return answer;
 198
 199                 fprintf(stderr, "Sorry, I did not understand your answer. "
 200                                 "Please type 'y' or 'n'\n");
 201         }
 202 }
 203
 204 int mingw_unlink(const char *pathname)
 205 {
 206         int ret, tries = 0;
 207         wchar_t wpathname[MAX_PATH];
 208         if (xutftowcs_path(wpathname, pathname) < 0)
 209                 return -1;
 210
 211         /* read-only files cannot be removed */
 212         _wchmod(wpathname, 0666);
 213         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 214                 if (!is_file_in_use_error(GetLastError()))
 215                         break;
 216                 /*
 217                  * We assume that some other process had the source or
 218                  * destination file open at the wrong moment and retry.
 219                  * In order to give the other process a higher chance to
 220                  * complete its operation, we give up our time slice now.
 221                  * If we have to retry again, we do sleep a bit.
 222                  */
 223                 Sleep(delay[tries]);
 224                 tries++;
 225         }
 226         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 227                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 228                         "Should I try again?", pathname))
 229                ret = _wunlink(wpathname);
 230         return ret;
 231 }
 232
 233 static int is_dir_empty(const wchar_t *wpath)
 234 {
 235         WIN32_FIND_DATAW findbuf;
 236         HANDLE handle;
 237         wchar_t wbuf[MAX_PATH + 2];
 238         wcscpy(wbuf, wpath);
 239         wcscat(wbuf, L"\\*");
 240         handle = FindFirstFileW(wbuf, &findbuf);
 241         if (handle == INVALID_HANDLE_VALUE)
 242                 return GetLastError() == ERROR_NO_MORE_FILES;
 243
 244         while (!wcscmp(findbuf.cFileName, L".") ||
 245                         !wcscmp(findbuf.cFileName, L".."))
 246                 if (!FindNextFileW(handle, &findbuf))
 247                         return GetLastError() == ERROR_NO_MORE_FILES;
 248         FindClose(handle);
 249         return 0;
 250 }
 251
 252 int mingw_rmdir(const char *pathname)
 253 {
 254         int ret, tries = 0;
 255         wchar_t wpathname[MAX_PATH];
 256         if (xutftowcs_path(wpathname, pathname) < 0)
 257                 return -1;
 258
 259         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 260                 if (!is_file_in_use_error(GetLastError()))
 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 && 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 static int make_hidden(const wchar_t *path)
 284 {
 285         DWORD attribs = GetFileAttributesW(path);
 286         if (SetFileAttributesW(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 287                 return 0;
 288         errno = err_win_to_posix(GetLastError());
 289         return -1;
 290 }
 291
 292 void mingw_mark_as_git_dir(const char *dir)
 293 {
 294         wchar_t wdir[MAX_PATH];
 295         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository())
 296                 if (xutftowcs_path(wdir, dir) < 0 || make_hidden(wdir))
 297                         warning("Failed to make '%s' hidden", dir);
 298         git_config_set("core.hideDotFiles",
 299                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 300                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 301                  "dotGitOnly" : "true"));
 302 }
 303
 304 int mingw_mkdir(const char *path, int mode)
 305 {
 306         int ret;
 307         wchar_t wpath[MAX_PATH];
 308         if (xutftowcs_path(wpath, path) < 0)
 309                 return -1;
 310         ret = _wmkdir(wpath);
 311         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 312                 /*
 313                  * In Windows a file or dir starting with a dot is not
 314                  * automatically hidden. So lets mark it as hidden when
 315                  * such a directory is created.
 316                  */
 317                 const char *start = basename((char*)path);
 318                 if (*start == '.')
 319                         return make_hidden(wpath);
 320         }
 321         return ret;
 322 }
 323
 324 int mingw_open (const char *filename, int oflags, ...)
 325 {
 326         va_list args;
 327         unsigned mode;
 328         int fd;
 329         wchar_t wfilename[MAX_PATH];
 330
 331         va_start(args, oflags);
 332         mode = va_arg(args, int);
 333         va_end(args);
 334
 335         if (filename && !strcmp(filename, "/dev/null"))
 336                 filename = "nul";
 337
 338         if (xutftowcs_path(wfilename, filename) < 0)
 339                 return -1;
 340         fd = _wopen(wfilename, oflags, mode);
 341
 342         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 343                 DWORD attrs = GetFileAttributesW(wfilename);
 344                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 345                         errno = EISDIR;
 346         }
 347         if ((oflags & O_CREAT) && fd >= 0 &&
 348             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 349                 /*
 350                  * In Windows a file or dir starting with a dot is not
 351                  * automatically hidden. So lets mark it as hidden when
 352                  * such a file is created.
 353                  */
 354                 const char *start = basename((char*)filename);
 355                 if (*start == '.' && make_hidden(wfilename))
 356                         warning("Could not mark '%s' as hidden.", filename);
 357         }
 358         return fd;
 359 }
 360
 361 #undef write
 362 ssize_t mingw_write(int fd, const void *buf, size_t count)
 363 {
 364         /*
 365          * While write() calls to a file on a local disk are translated
 366          * into WriteFile() calls with a maximum size of 64KB on Windows
 367          * XP and 256KB on Vista, no such cap is placed on writes to
 368          * files over the network on Windows XP.  Unfortunately, there
 369          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 370          * bigger writes fail on Windows XP.
 371          * So we cap to a nice 31MB here to avoid write failures over
 372          * the net without changing the number of WriteFile() calls in
 373          * the local case.
 374          */
 375         return write(fd, buf, min(count, 31 * 1024 * 1024));
 376 }
 377
 378 FILE *mingw_fopen (const char *filename, const char *otype)
 379 {
 380         int hide = 0;
 381         FILE *file;
 382         wchar_t wfilename[MAX_PATH], wotype[4];
 383         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 384             basename((char*)filename)[0] == '.')
 385                 hide = access(filename, F_OK);
 386         if (filename && !strcmp(filename, "/dev/null"))
 387                 filename = "nul";
 388         if (xutftowcs_path(wfilename, filename) < 0 ||
 389                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 390                 return NULL;
 391         file = _wfopen(wfilename, wotype);
 392         if (file && hide && make_hidden(wfilename))
 393                 warning("Could not mark '%s' as hidden.", filename);
 394         return file;
 395 }
 396
 397 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 398 {
 399         int hide = 0;
 400         FILE *file;
 401         wchar_t wfilename[MAX_PATH], wotype[4];
 402         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 403             basename((char*)filename)[0] == '.')
 404                 hide = access(filename, F_OK);
 405         if (filename && !strcmp(filename, "/dev/null"))
 406                 filename = "nul";
 407         if (xutftowcs_path(wfilename, filename) < 0 ||
 408                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 409                 return NULL;
 410         file = _wfreopen(wfilename, wotype, stream);
 411         if (file && hide && make_hidden(wfilename))
 412                 warning("Could not mark '%s' as hidden.", filename);
 413         return file;
 414 }
 415
 416 int mingw_access(const char *filename, int mode)
 417 {
 418         wchar_t wfilename[MAX_PATH];
 419         if (xutftowcs_path(wfilename, filename) < 0)
 420                 return -1;
 421         /* X_OK is not supported by the MSVCRT version */
 422         return _waccess(wfilename, mode & ~X_OK);
 423 }
 424
 425 int mingw_chdir(const char *dirname)
 426 {
 427         wchar_t wdirname[MAX_PATH];
 428         if (xutftowcs_path(wdirname, dirname) < 0)
 429                 return -1;
 430         return _wchdir(wdirname);
 431 }
 432
 433 int mingw_chmod(const char *filename, int mode)
 434 {
 435         wchar_t wfilename[MAX_PATH];
 436         if (xutftowcs_path(wfilename, filename) < 0)
 437                 return -1;
 438         return _wchmod(wfilename, mode);
 439 }
 440
 441 /*
 442  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 443  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 444  */
 445 static inline long long filetime_to_hnsec(const FILETIME *ft)
 446 {
 447         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 448         /* Windows to Unix Epoch conversion */
 449         return winTime - 116444736000000000LL;
 450 }
 451
 452 static inline time_t filetime_to_time_t(const FILETIME *ft)
 453 {
 454         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 455 }
 456
 457 /* We keep the do_lstat code in a separate function to avoid recursion.
 458  * When a path ends with a slash, the stat will fail with ENOENT. In
 459  * this case, we strip the trailing slashes and stat again.
 460  *
 461  * If follow is true then act like stat() and report on the link
 462  * target. Otherwise report on the link itself.
 463  */
 464 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 465 {
 466         WIN32_FILE_ATTRIBUTE_DATA fdata;
 467         wchar_t wfilename[MAX_PATH];
 468         if (xutftowcs_path(wfilename, file_name) < 0)
 469                 return -1;
 470
 471         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 472                 buf->st_ino = 0;
 473                 buf->st_gid = 0;
 474                 buf->st_uid = 0;
 475                 buf->st_nlink = 1;
 476                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 477                 buf->st_size = fdata.nFileSizeLow |
 478                         (((off_t)fdata.nFileSizeHigh)<<32);
 479                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 480                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 481                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 482                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 483                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 484                         WIN32_FIND_DATAW findbuf;
 485                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 486                         if (handle != INVALID_HANDLE_VALUE) {
 487                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 488                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 489                                         if (follow) {
 490                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 491                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 492                                         } else {
 493                                                 buf->st_mode = S_IFLNK;
 494                                         }
 495                                         buf->st_mode |= S_IREAD;
 496                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 497                                                 buf->st_mode |= S_IWRITE;
 498                                 }
 499                                 FindClose(handle);
 500                         }
 501                 }
 502                 return 0;
 503         }
 504         switch (GetLastError()) {
 505         case ERROR_ACCESS_DENIED:
 506         case ERROR_SHARING_VIOLATION:
 507         case ERROR_LOCK_VIOLATION:
 508         case ERROR_SHARING_BUFFER_EXCEEDED:
 509                 errno = EACCES;
 510                 break;
 511         case ERROR_BUFFER_OVERFLOW:
 512                 errno = ENAMETOOLONG;
 513                 break;
 514         case ERROR_NOT_ENOUGH_MEMORY:
 515                 errno = ENOMEM;
 516                 break;
 517         default:
 518                 errno = ENOENT;
 519                 break;
 520         }
 521         return -1;
 522 }
 523
 524 /* We provide our own lstat/fstat functions, since the provided
 525  * lstat/fstat functions are so slow. These stat functions are
 526  * tailored for Git's usage (read: fast), and are not meant to be
 527  * complete. Note that Git stat()s are redirected to mingw_lstat()
 528  * too, since Windows doesn't really handle symlinks that well.
 529  */
 530 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 531 {
 532         int namelen;
 533         char alt_name[PATH_MAX];
 534
 535         if (!do_lstat(follow, file_name, buf))
 536                 return 0;
 537
 538         /* if file_name ended in a '/', Windows returned ENOENT;
 539          * try again without trailing slashes
 540          */
 541         if (errno != ENOENT)
 542                 return -1;
 543
 544         namelen = strlen(file_name);
 545         if (namelen && file_name[namelen-1] != '/')
 546                 return -1;
 547         while (namelen && file_name[namelen-1] == '/')
 548                 --namelen;
 549         if (!namelen || namelen >= PATH_MAX)
 550                 return -1;
 551
 552         memcpy(alt_name, file_name, namelen);
 553         alt_name[namelen] = 0;
 554         return do_lstat(follow, alt_name, buf);
 555 }
 556
 557 int mingw_lstat(const char *file_name, struct stat *buf)
 558 {
 559         return do_stat_internal(0, file_name, buf);
 560 }
 561 int mingw_stat(const char *file_name, struct stat *buf)
 562 {
 563         return do_stat_internal(1, file_name, buf);
 564 }
 565
 566 #undef fstat
 567 int mingw_fstat(int fd, struct stat *buf)
 568 {
 569         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 570         BY_HANDLE_FILE_INFORMATION fdata;
 571
 572         if (fh == INVALID_HANDLE_VALUE) {
 573                 errno = EBADF;
 574                 return -1;
 575         }
 576         /* direct non-file handles to MS's fstat() */
 577         if (GetFileType(fh) != FILE_TYPE_DISK)
 578                 return _fstati64(fd, buf);
 579
 580         if (GetFileInformationByHandle(fh, &fdata)) {
 581                 buf->st_ino = 0;
 582                 buf->st_gid = 0;
 583                 buf->st_uid = 0;
 584                 buf->st_nlink = 1;
 585                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 586                 buf->st_size = fdata.nFileSizeLow |
 587                         (((off_t)fdata.nFileSizeHigh)<<32);
 588                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 589                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 590                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 591                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 592                 return 0;
 593         }
 594         errno = EBADF;
 595         return -1;
 596 }
 597
 598 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 599 {
 600         long long winTime = t * 10000000LL + 116444736000000000LL;
 601         ft->dwLowDateTime = winTime;
 602         ft->dwHighDateTime = winTime >> 32;
 603 }
 604
 605 int mingw_utime (const char *file_name, const struct utimbuf *times)
 606 {
 607         FILETIME mft, aft;
 608         int fh, rc;
 609         DWORD attrs;
 610         wchar_t wfilename[MAX_PATH];
 611         if (xutftowcs_path(wfilename, file_name) < 0)
 612                 return -1;
 613
 614         /* must have write permission */
 615         attrs = GetFileAttributesW(wfilename);
 616         if (attrs != INVALID_FILE_ATTRIBUTES &&
 617             (attrs & FILE_ATTRIBUTE_READONLY)) {
 618                 /* ignore errors here; open() will report them */
 619                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 620         }
 621
 622         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 623                 rc = -1;
 624                 goto revert_attrs;
 625         }
 626
 627         if (times) {
 628                 time_t_to_filetime(times->modtime, &mft);
 629                 time_t_to_filetime(times->actime, &aft);
 630         } else {
 631                 GetSystemTimeAsFileTime(&mft);
 632                 aft = mft;
 633         }
 634         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 635                 errno = EINVAL;
 636                 rc = -1;
 637         } else
 638                 rc = 0;
 639         close(fh);
 640
 641 revert_attrs:
 642         if (attrs != INVALID_FILE_ATTRIBUTES &&
 643             (attrs & FILE_ATTRIBUTE_READONLY)) {
 644                 /* ignore errors again */
 645                 SetFileAttributesW(wfilename, attrs);
 646         }
 647         return rc;
 648 }
 649
 650 unsigned int sleep (unsigned int seconds)
 651 {
 652         Sleep(seconds*1000);
 653         return 0;
 654 }
 655
 656 char *mingw_mktemp(char *template)
 657 {
 658         wchar_t wtemplate[MAX_PATH];
 659         if (xutftowcs_path(wtemplate, template) < 0)
 660                 return NULL;
 661         if (!_wmktemp(wtemplate))
 662                 return NULL;
 663         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 664                 return NULL;
 665         return template;
 666 }
 667
 668 int mkstemp(char *template)
 669 {
 670         char *filename = mktemp(template);
 671         if (filename == NULL)
 672                 return -1;
 673         return open(filename, O_RDWR | O_CREAT, 0600);
 674 }
 675
 676 int gettimeofday(struct timeval *tv, void *tz)
 677 {
 678         FILETIME ft;
 679         long long hnsec;
 680
 681         GetSystemTimeAsFileTime(&ft);
 682         hnsec = filetime_to_hnsec(&ft);
 683         tv->tv_sec = hnsec / 10000000;
 684         tv->tv_usec = (hnsec % 10000000) / 10;
 685         return 0;
 686 }
 687
 688 int pipe(int filedes[2])
 689 {
 690         HANDLE h[2];
 691
 692         /* this creates non-inheritable handles */
 693         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 694                 errno = err_win_to_posix(GetLastError());
 695                 return -1;
 696         }
 697         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 698         if (filedes[0] < 0) {
 699                 CloseHandle(h[0]);
 700                 CloseHandle(h[1]);
 701                 return -1;
 702         }
 703         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 704         if (filedes[0] < 0) {
 705                 close(filedes[0]);
 706                 CloseHandle(h[1]);
 707                 return -1;
 708         }
 709         return 0;
 710 }
 711
 712 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 713 {
 714         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 715         memcpy(result, gmtime(timep), sizeof(struct tm));
 716         return result;
 717 }
 718
 719 struct tm *localtime_r(const time_t *timep, struct tm *result)
 720 {
 721         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 722         memcpy(result, localtime(timep), sizeof(struct tm));
 723         return result;
 724 }
 725
 726 char *mingw_getcwd(char *pointer, int len)
 727 {
 728         int i;
 729         wchar_t wpointer[MAX_PATH];
 730         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 731                 return NULL;
 732         if (xwcstoutf(pointer, wpointer, len) < 0)
 733                 return NULL;
 734         for (i = 0; pointer[i]; i++)
 735                 if (pointer[i] == '\\')
 736                         pointer[i] = '/';
 737         return pointer;
 738 }
 739
 740 static int env_compare(const void *a, const void *b)
 741 {
 742         char *const *ea = a;
 743         char *const *eb = b;
 744         return strcasecmp(*ea, *eb);
 745 }
 746
 747 static int lookup_env(char **env, const char *name, size_t nmln)
 748 {
 749         int i;
 750
 751         for (i = 0; env[i]; i++) {
 752                 if (!strncasecmp(env[i], name, nmln) && '=' == env[i][nmln])
 753                         /* matches */
 754                         return i;
 755         }
 756         return -1;
 757 }
 758
 759 /*
 760  * If name contains '=', then sets the variable, otherwise it unsets it
 761  */
 762 static char **env_setenv(char **env, const char *name)
 763 {
 764         char *eq = strchrnul(name, '=');
 765         int i = lookup_env(env, name, eq-name);
 766
 767         if (i < 0) {
 768                 if (*eq) {
 769                         for (i = 0; env[i]; i++)
 770                                 ;
 771                         env = xrealloc(env, (i+2)*sizeof(*env));
 772                         env[i] = (char*) name;
 773                         env[i+1] = NULL;
 774                 }
 775         }
 776         else {
 777                 free(env[i]);
 778                 if (*eq)
 779                         env[i] = (char*) name;
 780                 else
 781                         for (; env[i]; i++)
 782                                 env[i] = env[i+1];
 783         }
 784         return env;
 785 }
 786
 787 #undef getenv
 788 char *mingw_getenv(const char *name)
 789 {
 790         char *result = getenv(name);
 791         if (!result && !strcmp(name, "TMPDIR")) {
 792                 /* on Windows it is TMP and TEMP */
 793                 result = getenv("TMP");
 794                 if (!result)
 795                         result = getenv("TEMP");
 796         }
 797         else if (!result && !strcmp(name, "TERM")) {
 798                 /* simulate TERM to enable auto-color (see color.c) */
 799                 result = "winansi";
 800         }
 801         return result;
 802 }
 803
 804 int mingw_putenv(const char *namevalue)
 805 {
 806         environ = env_setenv(environ, namevalue);
 807         return 0;
 808 }
 809
 810 /*
 811  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 812  * (Parsing C++ Command-Line Arguments)
 813  */
 814 static const char *quote_arg(const char *arg)
 815 {
 816         /* count chars to quote */
 817         int len = 0, n = 0;
 818         int force_quotes = 0;
 819         char *q, *d;
 820         const char *p = arg;
 821         if (!*p) force_quotes = 1;
 822         while (*p) {
 823                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 824                         force_quotes = 1;
 825                 else if (*p == '"')
 826                         n++;
 827                 else if (*p == '\\') {
 828                         int count = 0;
 829                         while (*p == '\\') {
 830                                 count++;
 831                                 p++;
 832                                 len++;
 833                         }
 834                         if (*p == '"')
 835                                 n += count*2 + 1;
 836                         continue;
 837                 }
 838                 len++;
 839                 p++;
 840         }
 841         if (!force_quotes && n == 0)
 842                 return arg;
 843
 844         /* insert \ where necessary */
 845         d = q = xmalloc(len+n+3);
 846         *d++ = '"';
 847         while (*arg) {
 848                 if (*arg == '"')
 849                         *d++ = '\\';
 850                 else if (*arg == '\\') {
 851                         int count = 0;
 852                         while (*arg == '\\') {
 853                                 count++;
 854                                 *d++ = *arg++;
 855                         }
 856                         if (*arg == '"') {
 857                                 while (count-- > 0)
 858                                         *d++ = '\\';
 859                                 *d++ = '\\';
 860                         }
 861                 }
 862                 *d++ = *arg++;
 863         }
 864         *d++ = '"';
 865         *d++ = 0;
 866         return q;
 867 }
 868
 869 static const char *parse_interpreter(const char *cmd)
 870 {
 871         static char buf[100];
 872         char *p, *opt;
 873         int n, fd;
 874
 875         /* don't even try a .exe */
 876         n = strlen(cmd);
 877         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 878                 return NULL;
 879
 880         fd = open(cmd, O_RDONLY);
 881         if (fd < 0)
 882                 return NULL;
 883         n = read(fd, buf, sizeof(buf)-1);
 884         close(fd);
 885         if (n < 4)      /* at least '#!/x' and not error */
 886                 return NULL;
 887
 888         if (buf[0] != '#' || buf[1] != '!')
 889                 return NULL;
 890         buf[n] = '\0';
 891         p = buf + strcspn(buf, "\r\n");
 892         if (!*p)
 893                 return NULL;
 894
 895         *p = '\0';
 896         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 897                 return NULL;
 898         /* strip options */
 899         if ((opt = strchr(p+1, ' ')))
 900                 *opt = '\0';
 901         return p+1;
 902 }
 903
 904 /*
 905  * Splits the PATH into parts.
 906  */
 907 static char **get_path_split(void)
 908 {
 909         char *p, **path, *envpath = getenv("PATH");
 910         int i, n = 0;
 911
 912         if (!envpath || !*envpath)
 913                 return NULL;
 914
 915         envpath = xstrdup(envpath);
 916         p = envpath;
 917         while (p) {
 918                 char *dir = p;
 919                 p = strchr(p, ';');
 920                 if (p) *p++ = '\0';
 921                 if (*dir) {     /* not earlier, catches series of ; */
 922                         ++n;
 923                 }
 924         }
 925         if (!n)
 926                 return NULL;
 927
 928         path = xmalloc((n+1)*sizeof(char *));
 929         p = envpath;
 930         i = 0;
 931         do {
 932                 if (*p)
 933                         path[i++] = xstrdup(p);
 934                 p = p+strlen(p)+1;
 935         } while (i < n);
 936         path[i] = NULL;
 937
 938         free(envpath);
 939
 940         return path;
 941 }
 942
 943 static void free_path_split(char **path)
 944 {
 945         char **p = path;
 946
 947         if (!path)
 948                 return;
 949
 950         while (*p)
 951                 free(*p++);
 952         free(path);
 953 }
 954
 955 /*
 956  * exe_only means that we only want to detect .exe files, but not scripts
 957  * (which do not have an extension)
 958  */
 959 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 960 {
 961         char path[MAX_PATH];
 962         wchar_t wpath[MAX_PATH];
 963         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 964
 965         if (xutftowcs_path(wpath, path) < 0)
 966                 return NULL;
 967
 968         if (!isexe && _waccess(wpath, F_OK) == 0)
 969                 return xstrdup(path);
 970         path[strlen(path)-4] = '\0';
 971         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
 972
 973                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY))
 974                         return xstrdup(path);
 975         }
 976         return NULL;
 977 }
 978
 979 /*
 980  * Determines the absolute path of cmd using the split path in path.
 981  * If cmd contains a slash or backslash, no lookup is performed.
 982  */
 983 static char *path_lookup(const char *cmd, char **path, int exe_only)
 984 {
 985         char *prog = NULL;
 986         int len = strlen(cmd);
 987         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 988
 989         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 990                 prog = xstrdup(cmd);
 991
 992         while (!prog && *path)
 993                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 994
 995         return prog;
 996 }
 997
 998 struct pinfo_t {
 999         struct pinfo_t *next;
1000         pid_t pid;
1001         HANDLE proc;
1002 } pinfo_t;
1003 struct pinfo_t *pinfo = NULL;
1004 CRITICAL_SECTION pinfo_cs;
1005
1006 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
1007                               const char *dir,
1008                               int prepend_cmd, int fhin, int fhout, int fherr)
1009 {
1010         STARTUPINFOW si;
1011         PROCESS_INFORMATION pi;
1012         struct strbuf args;
1013         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1014         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1015         BOOL ret;
1016
1017         /* Determine whether or not we are associated to a console */
1018         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1019                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1020                         FILE_ATTRIBUTE_NORMAL, NULL);
1021         if (cons == INVALID_HANDLE_VALUE) {
1022                 /* There is no console associated with this process.
1023                  * Since the child is a console process, Windows
1024                  * would normally create a console window. But
1025                  * since we'll be redirecting std streams, we do
1026                  * not need the console.
1027                  * It is necessary to use DETACHED_PROCESS
1028                  * instead of CREATE_NO_WINDOW to make ssh
1029                  * recognize that it has no console.
1030                  */
1031                 flags |= DETACHED_PROCESS;
1032         } else {
1033                 /* There is already a console. If we specified
1034                  * DETACHED_PROCESS here, too, Windows would
1035                  * disassociate the child from the console.
1036                  * The same is true for CREATE_NO_WINDOW.
1037                  * Go figure!
1038                  */
1039                 CloseHandle(cons);
1040         }
1041         memset(&si, 0, sizeof(si));
1042         si.cb = sizeof(si);
1043         si.dwFlags = STARTF_USESTDHANDLES;
1044         si.hStdInput = winansi_get_osfhandle(fhin);
1045         si.hStdOutput = winansi_get_osfhandle(fhout);
1046         si.hStdError = winansi_get_osfhandle(fherr);
1047
1048         if (xutftowcs_path(wcmd, cmd) < 0)
1049                 return -1;
1050         if (dir && xutftowcs_path(wdir, dir) < 0)
1051                 return -1;
1052
1053         /* concatenate argv, quoting args as we go */
1054         strbuf_init(&args, 0);
1055         if (prepend_cmd) {
1056                 char *quoted = (char *)quote_arg(cmd);
1057                 strbuf_addstr(&args, quoted);
1058                 if (quoted != cmd)
1059                         free(quoted);
1060         }
1061         for (; *argv; argv++) {
1062                 char *quoted = (char *)quote_arg(*argv);
1063                 if (*args.buf)
1064                         strbuf_addch(&args, ' ');
1065                 strbuf_addstr(&args, quoted);
1066                 if (quoted != *argv)
1067                         free(quoted);
1068         }
1069
1070         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1071         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1072         strbuf_release(&args);
1073
1074         if (env) {
1075                 int count = 0;
1076                 char **e, **sorted_env;
1077                 int size = 0, wenvsz = 0, wenvpos = 0;
1078
1079                 for (e = env; *e; e++)
1080                         count++;
1081
1082                 /* environment must be sorted */
1083                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
1084                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
1085                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
1086
1087                 /* create environment block from temporary environment */
1088                 for (e = sorted_env; *e; e++) {
1089                         size = 2 * strlen(*e) + 2; /* +2 for final \0 */
1090                         ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1091                         wenvpos += xutftowcs(&wenvblk[wenvpos], *e, size) + 1;
1092                 }
1093                 /* add final \0 terminator */
1094                 wenvblk[wenvpos] = 0;
1095                 free(sorted_env);
1096         }
1097
1098         memset(&pi, 0, sizeof(pi));
1099         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1100                 wenvblk, dir ? wdir : NULL, &si, &pi);
1101
1102         free(wenvblk);
1103         free(wargs);
1104
1105         if (!ret) {
1106                 errno = ENOENT;
1107                 return -1;
1108         }
1109         CloseHandle(pi.hThread);
1110
1111         /*
1112          * The process ID is the human-readable identifier of the process
1113          * that we want to present in log and error messages. The handle
1114          * is not useful for this purpose. But we cannot close it, either,
1115          * because it is not possible to turn a process ID into a process
1116          * handle after the process terminated.
1117          * Keep the handle in a list for waitpid.
1118          */
1119         EnterCriticalSection(&pinfo_cs);
1120         {
1121                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1122                 info->pid = pi.dwProcessId;
1123                 info->proc = pi.hProcess;
1124                 info->next = pinfo;
1125                 pinfo = info;
1126         }
1127         LeaveCriticalSection(&pinfo_cs);
1128
1129         return (pid_t)pi.dwProcessId;
1130 }
1131
1132 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1133 {
1134         return mingw_spawnve_fd(cmd, argv, environ, NULL, prepend_cmd, 0, 1, 2);
1135 }
1136
1137 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
1138                      const char *dir,
1139                      int fhin, int fhout, int fherr)
1140 {
1141         pid_t pid;
1142         char **path = get_path_split();
1143         char *prog = path_lookup(cmd, path, 0);
1144
1145         if (!prog) {
1146                 errno = ENOENT;
1147                 pid = -1;
1148         }
1149         else {
1150                 const char *interpr = parse_interpreter(prog);
1151
1152                 if (interpr) {
1153                         const char *argv0 = argv[0];
1154                         char *iprog = path_lookup(interpr, path, 1);
1155                         argv[0] = prog;
1156                         if (!iprog) {
1157                                 errno = ENOENT;
1158                                 pid = -1;
1159                         }
1160                         else {
1161                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1162                                                        fhin, fhout, fherr);
1163                                 free(iprog);
1164                         }
1165                         argv[0] = argv0;
1166                 }
1167                 else
1168                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1169                                                fhin, fhout, fherr);
1170                 free(prog);
1171         }
1172         free_path_split(path);
1173         return pid;
1174 }
1175
1176 static int try_shell_exec(const char *cmd, char *const *argv)
1177 {
1178         const char *interpr = parse_interpreter(cmd);
1179         char **path;
1180         char *prog;
1181         int pid = 0;
1182
1183         if (!interpr)
1184                 return 0;
1185         path = get_path_split();
1186         prog = path_lookup(interpr, path, 1);
1187         if (prog) {
1188                 int argc = 0;
1189                 const char **argv2;
1190                 while (argv[argc]) argc++;
1191                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1192                 argv2[0] = (char *)cmd; /* full path to the script file */
1193                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1194                 pid = mingw_spawnv(prog, argv2, 1);
1195                 if (pid >= 0) {
1196                         int status;
1197                         if (waitpid(pid, &status, 0) < 0)
1198                                 status = 255;
1199                         exit(status);
1200                 }
1201                 pid = 1;        /* indicate that we tried but failed */
1202                 free(prog);
1203                 free(argv2);
1204         }
1205         free_path_split(path);
1206         return pid;
1207 }
1208
1209 int mingw_execv(const char *cmd, char *const *argv)
1210 {
1211         /* check if git_command is a shell script */
1212         if (!try_shell_exec(cmd, argv)) {
1213                 int pid, status;
1214
1215                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1216                 if (pid < 0)
1217                         return -1;
1218                 if (waitpid(pid, &status, 0) < 0)
1219                         status = 255;
1220                 exit(status);
1221         }
1222         return -1;
1223 }
1224
1225 int mingw_execvp(const char *cmd, char *const *argv)
1226 {
1227         char **path = get_path_split();
1228         char *prog = path_lookup(cmd, path, 0);
1229
1230         if (prog) {
1231                 mingw_execv(prog, argv);
1232                 free(prog);
1233         } else
1234                 errno = ENOENT;
1235
1236         free_path_split(path);
1237         return -1;
1238 }
1239
1240 int mingw_kill(pid_t pid, int sig)
1241 {
1242         if (pid > 0 && sig == SIGTERM) {
1243                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1244
1245                 if (TerminateProcess(h, -1)) {
1246                         CloseHandle(h);
1247                         return 0;
1248                 }
1249
1250                 errno = err_win_to_posix(GetLastError());
1251                 CloseHandle(h);
1252                 return -1;
1253         }
1254
1255         errno = EINVAL;
1256         return -1;
1257 }
1258
1259 static char **copy_environ(void)
1260 {
1261         char **env;
1262         int i = 0;
1263         while (environ[i])
1264                 i++;
1265         env = xmalloc((i+1)*sizeof(*env));
1266         for (i = 0; environ[i]; i++)
1267                 env[i] = xstrdup(environ[i]);
1268         env[i] = NULL;
1269         return env;
1270 }
1271
1272 void free_environ(char **env)
1273 {
1274         int i;
1275         for (i = 0; env[i]; i++)
1276                 free(env[i]);
1277         free(env);
1278 }
1279
1280 /*
1281  * Copies global environ and adjusts variables as specified by vars.
1282  */
1283 char **make_augmented_environ(const char *const *vars)
1284 {
1285         char **env = copy_environ();
1286
1287         while (*vars) {
1288                 const char *v = *vars++;
1289                 env = env_setenv(env, strchr(v, '=') ? xstrdup(v) : v);
1290         }
1291         return env;
1292 }
1293
1294 /*
1295  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1296  * that service contains a numerical port, or that it is null. It
1297  * does a simple search using gethostbyname, and returns one IPv4 host
1298  * if one was found.
1299  */
1300 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1301                                    const struct addrinfo *hints,
1302                                    struct addrinfo **res)
1303 {
1304         struct hostent *h = NULL;
1305         struct addrinfo *ai;
1306         struct sockaddr_in *sin;
1307
1308         if (node) {
1309                 h = gethostbyname(node);
1310                 if (!h)
1311                         return WSAGetLastError();
1312         }
1313
1314         ai = xmalloc(sizeof(struct addrinfo));
1315         *res = ai;
1316         ai->ai_flags = 0;
1317         ai->ai_family = AF_INET;
1318         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1319         switch (ai->ai_socktype) {
1320         case SOCK_STREAM:
1321                 ai->ai_protocol = IPPROTO_TCP;
1322                 break;
1323         case SOCK_DGRAM:
1324                 ai->ai_protocol = IPPROTO_UDP;
1325                 break;
1326         default:
1327                 ai->ai_protocol = 0;
1328                 break;
1329         }
1330         ai->ai_addrlen = sizeof(struct sockaddr_in);
1331         if (hints && (hints->ai_flags & AI_CANONNAME))
1332                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1333         else
1334                 ai->ai_canonname = NULL;
1335
1336         sin = xmalloc(ai->ai_addrlen);
1337         memset(sin, 0, ai->ai_addrlen);
1338         sin->sin_family = AF_INET;
1339         /* Note: getaddrinfo is supposed to allow service to be a string,
1340          * which should be looked up using getservbyname. This is
1341          * currently not implemented */
1342         if (service)
1343                 sin->sin_port = htons(atoi(service));
1344         if (h)
1345                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1346         else if (hints && (hints->ai_flags & AI_PASSIVE))
1347                 sin->sin_addr.s_addr = INADDR_ANY;
1348         else
1349                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1350         ai->ai_addr = (struct sockaddr *)sin;
1351         ai->ai_next = 0;
1352         return 0;
1353 }
1354
1355 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1356 {
1357         free(res->ai_canonname);
1358         free(res->ai_addr);
1359         free(res);
1360 }
1361
1362 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1363                                    char *host, DWORD hostlen,
1364                                    char *serv, DWORD servlen, int flags)
1365 {
1366         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1367         if (sa->sa_family != AF_INET)
1368                 return EAI_FAMILY;
1369         if (!host && !serv)
1370                 return EAI_NONAME;
1371
1372         if (host && hostlen > 0) {
1373                 struct hostent *ent = NULL;
1374                 if (!(flags & NI_NUMERICHOST))
1375                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1376                                             sizeof(sin->sin_addr), AF_INET);
1377
1378                 if (ent)
1379                         snprintf(host, hostlen, "%s", ent->h_name);
1380                 else if (flags & NI_NAMEREQD)
1381                         return EAI_NONAME;
1382                 else
1383                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1384         }
1385
1386         if (serv && servlen > 0) {
1387                 struct servent *ent = NULL;
1388                 if (!(flags & NI_NUMERICSERV))
1389                         ent = getservbyport(sin->sin_port,
1390                                             flags & NI_DGRAM ? "udp" : "tcp");
1391
1392                 if (ent)
1393                         snprintf(serv, servlen, "%s", ent->s_name);
1394                 else
1395                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1396         }
1397
1398         return 0;
1399 }
1400
1401 static HMODULE ipv6_dll = NULL;
1402 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1403 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1404                                       const struct addrinfo *hints,
1405                                       struct addrinfo **res);
1406 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1407                                       char *host, DWORD hostlen,
1408                                       char *serv, DWORD servlen, int flags);
1409 /*
1410  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1411  * don't need to try to load that one dynamically.
1412  */
1413
1414 static void socket_cleanup(void)
1415 {
1416         WSACleanup();
1417         if (ipv6_dll)
1418                 FreeLibrary(ipv6_dll);
1419         ipv6_dll = NULL;
1420         ipv6_freeaddrinfo = freeaddrinfo_stub;
1421         ipv6_getaddrinfo = getaddrinfo_stub;
1422         ipv6_getnameinfo = getnameinfo_stub;
1423 }
1424
1425 static void ensure_socket_initialization(void)
1426 {
1427         WSADATA wsa;
1428         static int initialized = 0;
1429         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1430         const char **name;
1431
1432         if (initialized)
1433                 return;
1434
1435         if (WSAStartup(MAKEWORD(2,2), &wsa))
1436                 die("unable to initialize winsock subsystem, error %d",
1437                         WSAGetLastError());
1438
1439         for (name = libraries; *name; name++) {
1440                 ipv6_dll = LoadLibrary(*name);
1441                 if (!ipv6_dll)
1442                         continue;
1443
1444                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1445                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1446                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1447                                                    const struct addrinfo *,
1448                                                    struct addrinfo **))
1449                         GetProcAddress(ipv6_dll, "getaddrinfo");
1450                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1451                                                    socklen_t, char *, DWORD,
1452                                                    char *, DWORD, int))
1453                         GetProcAddress(ipv6_dll, "getnameinfo");
1454                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1455                         FreeLibrary(ipv6_dll);
1456                         ipv6_dll = NULL;
1457                 } else
1458                         break;
1459         }
1460         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1461                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1462                 ipv6_getaddrinfo = getaddrinfo_stub;
1463                 ipv6_getnameinfo = getnameinfo_stub;
1464         }
1465
1466         atexit(socket_cleanup);
1467         initialized = 1;
1468 }
1469
1470 #undef gethostname
1471 int mingw_gethostname(char *name, int namelen)
1472 {
1473     ensure_socket_initialization();
1474     return gethostname(name, namelen);
1475 }
1476
1477 #undef gethostbyname
1478 struct hostent *mingw_gethostbyname(const char *host)
1479 {
1480         ensure_socket_initialization();
1481         return gethostbyname(host);
1482 }
1483
1484 void mingw_freeaddrinfo(struct addrinfo *res)
1485 {
1486         ipv6_freeaddrinfo(res);
1487 }
1488
1489 int mingw_getaddrinfo(const char *node, const char *service,
1490                       const struct addrinfo *hints, struct addrinfo **res)
1491 {
1492         ensure_socket_initialization();
1493         return ipv6_getaddrinfo(node, service, hints, res);
1494 }
1495
1496 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1497                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1498                       int flags)
1499 {
1500         ensure_socket_initialization();
1501         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1502 }
1503
1504 int mingw_socket(int domain, int type, int protocol)
1505 {
1506         int sockfd;
1507         SOCKET s;
1508
1509         ensure_socket_initialization();
1510         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1511         if (s == INVALID_SOCKET) {
1512                 /*
1513                  * WSAGetLastError() values are regular BSD error codes
1514                  * biased by WSABASEERR.
1515                  * However, strerror() does not know about networking
1516                  * specific errors, which are values beginning at 38 or so.
1517                  * Therefore, we choose to leave the biased error code
1518                  * in errno so that _if_ someone looks up the code somewhere,
1519                  * then it is at least the number that are usually listed.
1520                  */
1521                 errno = WSAGetLastError();
1522                 return -1;
1523         }
1524         /* convert into a file descriptor */
1525         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1526                 closesocket(s);
1527                 return error("unable to make a socket file descriptor: %s",
1528                         strerror(errno));
1529         }
1530         return sockfd;
1531 }
1532
1533 #undef connect
1534 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1535 {
1536         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1537         return connect(s, sa, sz);
1538 }
1539
1540 #undef bind
1541 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1542 {
1543         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1544         return bind(s, sa, sz);
1545 }
1546
1547 #undef setsockopt
1548 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1549 {
1550         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1551         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1552 }
1553
1554 #undef shutdown
1555 int mingw_shutdown(int sockfd, int how)
1556 {
1557         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1558         return shutdown(s, how);
1559 }
1560
1561 #undef listen
1562 int mingw_listen(int sockfd, int backlog)
1563 {
1564         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1565         return listen(s, backlog);
1566 }
1567
1568 #undef accept
1569 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1570 {
1571         int sockfd2;
1572
1573         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1574         SOCKET s2 = accept(s1, sa, sz);
1575
1576         /* convert into a file descriptor */
1577         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1578                 int err = errno;
1579                 closesocket(s2);
1580                 return error("unable to make a socket file descriptor: %s",
1581                         strerror(err));
1582         }
1583         return sockfd2;
1584 }
1585
1586 #undef rename
1587 int mingw_rename(const char *pold, const char *pnew)
1588 {
1589         DWORD attrs, gle;
1590         int tries = 0;
1591         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1592         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1593                 return -1;
1594
1595         /*
1596          * Try native rename() first to get errno right.
1597          * It is based on MoveFile(), which cannot overwrite existing files.
1598          */
1599         if (!_wrename(wpold, wpnew))
1600                 return 0;
1601         if (errno != EEXIST)
1602                 return -1;
1603 repeat:
1604         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1605                 return 0;
1606         /* TODO: translate more errors */
1607         gle = GetLastError();
1608         if (gle == ERROR_ACCESS_DENIED &&
1609             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1610                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1611                         errno = EISDIR;
1612                         return -1;
1613                 }
1614                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1615                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1616                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1617                                 return 0;
1618                         gle = GetLastError();
1619                         /* revert file attributes on failure */
1620                         SetFileAttributesW(wpnew, attrs);
1621                 }
1622         }
1623         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1624                 /*
1625                  * We assume that some other process had the source or
1626                  * destination file open at the wrong moment and retry.
1627                  * In order to give the other process a higher chance to
1628                  * complete its operation, we give up our time slice now.
1629                  * If we have to retry again, we do sleep a bit.
1630                  */
1631                 Sleep(delay[tries]);
1632                 tries++;
1633                 goto repeat;
1634         }
1635         if (gle == ERROR_ACCESS_DENIED &&
1636                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1637                        "Should I try again?", pold, pnew))
1638                 goto repeat;
1639
1640         errno = EACCES;
1641         return -1;
1642 }
1643
1644 /*
1645  * Note that this doesn't return the actual pagesize, but
1646  * the allocation granularity. If future Windows specific git code
1647  * needs the real getpagesize function, we need to find another solution.
1648  */
1649 int mingw_getpagesize(void)
1650 {
1651         SYSTEM_INFO si;
1652         GetSystemInfo(&si);
1653         return si.dwAllocationGranularity;
1654 }
1655
1656 struct passwd *getpwuid(int uid)
1657 {
1658         static char user_name[100];
1659         static struct passwd p;
1660
1661         DWORD len = sizeof(user_name);
1662         if (!GetUserName(user_name, &len))
1663                 return NULL;
1664         p.pw_name = user_name;
1665         p.pw_gecos = "unknown";
1666         p.pw_dir = NULL;
1667         return &p;
1668 }
1669
1670 static HANDLE timer_event;
1671 static HANDLE timer_thread;
1672 static int timer_interval;
1673 static int one_shot;
1674 static sig_handler_t timer_fn = SIG_DFL;
1675
1676 /* The timer works like this:
1677  * The thread, ticktack(), is a trivial routine that most of the time
1678  * only waits to receive the signal to terminate. The main thread tells
1679  * the thread to terminate by setting the timer_event to the signalled
1680  * state.
1681  * But ticktack() interrupts the wait state after the timer's interval
1682  * length to call the signal handler.
1683  */
1684
1685 static unsigned __stdcall ticktack(void *dummy)
1686 {
1687         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1688                 if (timer_fn == SIG_DFL)
1689                         die("Alarm");
1690                 if (timer_fn != SIG_IGN)
1691                         timer_fn(SIGALRM);
1692                 if (one_shot)
1693                         break;
1694         }
1695         return 0;
1696 }
1697
1698 static int start_timer_thread(void)
1699 {
1700         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1701         if (timer_event) {
1702                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1703                 if (!timer_thread )
1704                         return errno = ENOMEM,
1705                                 error("cannot start timer thread");
1706         } else
1707                 return errno = ENOMEM,
1708                         error("cannot allocate resources for timer");
1709         return 0;
1710 }
1711
1712 static void stop_timer_thread(void)
1713 {
1714         if (timer_event)
1715                 SetEvent(timer_event);  /* tell thread to terminate */
1716         if (timer_thread) {
1717                 int rc = WaitForSingleObject(timer_thread, 1000);
1718                 if (rc == WAIT_TIMEOUT)
1719                         error("timer thread did not terminate timely");
1720                 else if (rc != WAIT_OBJECT_0)
1721                         error("waiting for timer thread failed: %lu",
1722                               GetLastError());
1723                 CloseHandle(timer_thread);
1724         }
1725         if (timer_event)
1726                 CloseHandle(timer_event);
1727         timer_event = NULL;
1728         timer_thread = NULL;
1729 }
1730
1731 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1732 {
1733         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1734 }
1735
1736 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1737 {
1738         static const struct timeval zero;
1739         static int atexit_done;
1740
1741         if (out != NULL)
1742                 return errno = EINVAL,
1743                         error("setitimer param 3 != NULL not implemented");
1744         if (!is_timeval_eq(&in->it_interval, &zero) &&
1745             !is_timeval_eq(&in->it_interval, &in->it_value))
1746                 return errno = EINVAL,
1747                         error("setitimer: it_interval must be zero or eq it_value");
1748
1749         if (timer_thread)
1750                 stop_timer_thread();
1751
1752         if (is_timeval_eq(&in->it_value, &zero) &&
1753             is_timeval_eq(&in->it_interval, &zero))
1754                 return 0;
1755
1756         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1757         one_shot = is_timeval_eq(&in->it_interval, &zero);
1758         if (!atexit_done) {
1759                 atexit(stop_timer_thread);
1760                 atexit_done = 1;
1761         }
1762         return start_timer_thread();
1763 }
1764
1765 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1766 {
1767         if (sig != SIGALRM)
1768                 return errno = EINVAL,
1769                         error("sigaction only implemented for SIGALRM");
1770         if (out != NULL)
1771                 return errno = EINVAL,
1772                         error("sigaction: param 3 != NULL not implemented");
1773
1774         timer_fn = in->sa_handler;
1775         return 0;
1776 }
1777
1778 #undef signal
1779 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1780 {
1781         sig_handler_t old = timer_fn;
1782         if (sig != SIGALRM)
1783                 return signal(sig, handler);
1784         timer_fn = handler;
1785         return old;
1786 }
1787
1788 static const char *make_backslash_path(const char *path)
1789 {
1790         static char buf[PATH_MAX + 1];
1791         char *c;
1792
1793         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1794                 die("Too long path: %.*s", 60, path);
1795
1796         for (c = buf; *c; c++) {
1797                 if (*c == '/')
1798                         *c = '\\';
1799         }
1800         return buf;
1801 }
1802
1803 void mingw_open_html(const char *unixpath)
1804 {
1805         const char *htmlpath = make_backslash_path(unixpath);
1806         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1807                         const char *, const char *, const char *, INT);
1808         T ShellExecute;
1809         HMODULE shell32;
1810         int r;
1811
1812         shell32 = LoadLibrary("shell32.dll");
1813         if (!shell32)
1814                 die("cannot load shell32.dll");
1815         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1816         if (!ShellExecute)
1817                 die("cannot run browser");
1818
1819         printf("Launching default browser to display HTML ...\n");
1820         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1821         FreeLibrary(shell32);
1822         /* see the MSDN documentation referring to the result codes here */
1823         if (r <= 32) {
1824                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1825         }
1826 }
1827
1828 int link(const char *oldpath, const char *newpath)
1829 {
1830         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1831         static T create_hard_link = NULL;
1832         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1833         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1834                 xutftowcs_path(wnewpath, newpath) < 0)
1835                 return -1;
1836
1837         if (!create_hard_link) {
1838                 create_hard_link = (T) GetProcAddress(
1839                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1840                 if (!create_hard_link)
1841                         create_hard_link = (T)-1;
1842         }
1843         if (create_hard_link == (T)-1) {
1844                 errno = ENOSYS;
1845                 return -1;
1846         }
1847         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1848                 errno = err_win_to_posix(GetLastError());
1849                 return -1;
1850         }
1851         return 0;
1852 }
1853
1854 char *getpass(const char *prompt)
1855 {
1856         struct strbuf buf = STRBUF_INIT;
1857
1858         fputs(prompt, stderr);
1859         for (;;) {
1860                 char c = _getch();
1861                 if (c == '\r' || c == '\n')
1862                         break;
1863                 strbuf_addch(&buf, c);
1864         }
1865         fputs("\n", stderr);
1866         return strbuf_detach(&buf, NULL);
1867 }
1868
1869 pid_t waitpid(pid_t pid, int *status, int options)
1870 {
1871         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1872             FALSE, pid);
1873         if (!h) {
1874                 errno = ECHILD;
1875                 return -1;
1876         }
1877
1878         if (pid > 0 && options & WNOHANG) {
1879                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1880                         CloseHandle(h);
1881                         return 0;
1882                 }
1883                 options &= ~WNOHANG;
1884         }
1885
1886         if (options == 0) {
1887                 struct pinfo_t **ppinfo;
1888                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1889                         CloseHandle(h);
1890                         return 0;
1891                 }
1892
1893                 if (status)
1894                         GetExitCodeProcess(h, (LPDWORD)status);
1895
1896                 EnterCriticalSection(&pinfo_cs);
1897
1898                 ppinfo = &pinfo;
1899                 while (*ppinfo) {
1900                         struct pinfo_t *info = *ppinfo;
1901                         if (info->pid == pid) {
1902                                 CloseHandle(info->proc);
1903                                 *ppinfo = info->next;
1904                                 free(info);
1905                                 break;
1906                         }
1907                         ppinfo = &info->next;
1908                 }
1909
1910                 LeaveCriticalSection(&pinfo_cs);
1911
1912                 CloseHandle(h);
1913                 return pid;
1914         }
1915         CloseHandle(h);
1916
1917         errno = EINVAL;
1918         return -1;
1919 }
1920
1921 const char *get_windows_home_directory(void)
1922 {
1923         static const char *home_directory = NULL;
1924         struct strbuf buf = STRBUF_INIT;
1925
1926         if (home_directory)
1927                 return home_directory;
1928
1929         home_directory = getenv("HOME");
1930         if (home_directory && *home_directory)
1931                 return home_directory;
1932
1933         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1934         home_directory = strbuf_detach(&buf, NULL);
1935
1936         return home_directory;
1937 }
1938
1939 int mingw_offset_1st_component(const char *path)
1940 {
1941         int offset = 0;
1942         if (has_dos_drive_prefix(path))
1943                 offset = 2;
1944
1945         /* unc paths */
1946         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1947
1948                 /* skip server name */
1949                 char *pos = strpbrk(path + 2, "\\/");
1950                 if (!pos)
1951                         return 0; /* Error: malformed unc path */
1952
1953                 do {
1954                         pos++;
1955                 } while (*pos && !is_dir_sep(*pos));
1956
1957                 offset = pos - path;
1958         }
1959
1960         return offset + is_dir_sep(path[offset]);
1961 }
1962
1963 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1964 {
1965         int upos = 0, wpos = 0;
1966         const unsigned char *utf = (const unsigned char*) utfs;
1967         if (!utf || !wcs || wcslen < 1) {
1968                 errno = EINVAL;
1969                 return -1;
1970         }
1971         /* reserve space for \0 */
1972         wcslen--;
1973         if (utflen < 0)
1974                 utflen = INT_MAX;
1975
1976         while (upos < utflen) {
1977                 int c = utf[upos++] & 0xff;
1978                 if (utflen == INT_MAX && c == 0)
1979                         break;
1980
1981                 if (wpos >= wcslen) {
1982                         wcs[wpos] = 0;
1983                         errno = ERANGE;
1984                         return -1;
1985                 }
1986
1987                 if (c < 0x80) {
1988                         /* ASCII */
1989                         wcs[wpos++] = c;
1990                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1991                                 (utf[upos] & 0xc0) == 0x80) {
1992                         /* 2-byte utf-8 */
1993                         c = ((c & 0x1f) << 6);
1994                         c |= (utf[upos++] & 0x3f);
1995                         wcs[wpos++] = c;
1996                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1997                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1998                                 (utf[upos] & 0xc0) == 0x80 &&
1999                                 (utf[upos + 1] & 0xc0) == 0x80) {
2000                         /* 3-byte utf-8 */
2001                         c = ((c & 0x0f) << 12);
2002                         c |= ((utf[upos++] & 0x3f) << 6);
2003                         c |= (utf[upos++] & 0x3f);
2004                         wcs[wpos++] = c;
2005                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2006                                 wpos + 1 < wcslen &&
2007                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2008                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2009                                 (utf[upos] & 0xc0) == 0x80 &&
2010                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2011                                 (utf[upos + 2] & 0xc0) == 0x80) {
2012                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2013                         c = ((c & 0x07) << 18);
2014                         c |= ((utf[upos++] & 0x3f) << 12);
2015                         c |= ((utf[upos++] & 0x3f) << 6);
2016                         c |= (utf[upos++] & 0x3f);
2017                         c -= 0x10000;
2018                         wcs[wpos++] = 0xd800 | (c >> 10);
2019                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2020                 } else if (c >= 0xa0) {
2021                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2022                         wcs[wpos++] = c;
2023                 } else {
2024                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2025                         static const char *hex = "0123456789abcdef";
2026                         wcs[wpos++] = hex[c >> 4];
2027                         if (wpos < wcslen)
2028                                 wcs[wpos++] = hex[c & 0x0f];
2029                 }
2030         }
2031         wcs[wpos] = 0;
2032         return wpos;
2033 }
2034
2035 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2036 {
2037         if (!wcs || !utf || utflen < 1) {
2038                 errno = EINVAL;
2039                 return -1;
2040         }
2041         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2042         if (utflen)
2043                 return utflen - 1;
2044         errno = ERANGE;
2045         return -1;
2046 }
2047
2048 /*
2049  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2050  * mingw startup code, see init.c in mingw runtime).
2051  */
2052 int _CRT_glob = 0;
2053
2054 typedef struct {
2055         int newmode;
2056 } _startupinfo;
2057
2058 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2059                 _startupinfo *si);
2060
2061 void mingw_startup()
2062 {
2063         int i, len, maxlen, argc;
2064         char *buffer;
2065         wchar_t **wenv, **wargv;
2066         _startupinfo si;
2067
2068         /* get wide char arguments and environment */
2069         si.newmode = 0;
2070         __wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si);
2071
2072         /* determine size of argv and environ conversion buffer */
2073         maxlen = wcslen(_wpgmptr);
2074         for (i = 1; i < argc; i++)
2075                 maxlen = max(maxlen, wcslen(wargv[i]));
2076         for (i = 0; wenv[i]; i++)
2077                 maxlen = max(maxlen, wcslen(wenv[i]));
2078
2079         /* nedmalloc can't free CRT memory, allocate resizable environment list */
2080         environ = xcalloc(i + 1, sizeof(char*));
2081
2082         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2083         maxlen = 3 * maxlen + 1;
2084         buffer = xmalloc(maxlen);
2085
2086         /* convert command line arguments and environment to UTF-8 */
2087         len = xwcstoutf(buffer, _wpgmptr, maxlen);
2088         __argv[0] = xmemdupz(buffer, len);
2089         for (i = 1; i < argc; i++) {
2090                 len = xwcstoutf(buffer, wargv[i], maxlen);
2091                 __argv[i] = xmemdupz(buffer, len);
2092         }
2093         for (i = 0; wenv[i]; i++) {
2094                 len = xwcstoutf(buffer, wenv[i], maxlen);
2095                 environ[i] = xmemdupz(buffer, len);
2096         }
2097         free(buffer);
2098
2099         /* initialize critical section for waitpid pinfo_t list */
2100         InitializeCriticalSection(&pinfo_cs);
2101
2102         /* set up default file mode and file modes for stdin/out/err */
2103         _fmode = _O_BINARY;
2104         _setmode(_fileno(stdin), _O_BINARY);
2105         _setmode(_fileno(stdout), _O_BINARY);
2106         _setmode(_fileno(stderr), _O_BINARY);
2107
2108         /* initialize Unicode console */
2109         winansi_init();
2110 }