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 compareenv(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 lookupenv(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  * Size includes the terminating NULL. Env must have room for size + 1 entries
 762  * (in case of insert). Returns the new size. Optionally frees removed entries.
 763  */
 764 static int do_putenv(char **env, const char *name, int size, int free_old)
 765 {
 766         char *eq = strchrnul(name, '=');
 767         int i = lookupenv(env, name, eq-name);
 768
 769         if (i < 0) {
 770                 if (*eq) {
 771                         env[size - 1] = (char*) name;
 772                         env[size] = NULL;
 773                         size++;
 774                 }
 775         }
 776         else {
 777                 if (free_old)
 778                         free(env[i]);
 779                 if (*eq)
 780                         env[i] = (char*) name;
 781                 else {
 782                         for (; env[i]; i++)
 783                                 env[i] = env[i+1];
 784                         size--;
 785                 }
 786         }
 787         return size;
 788 }
 789
 790 /* used number of elements of environ array, including terminating NULL */
 791 static int environ_size = 0;
 792 /* allocated size of environ array, in bytes */
 793 static int environ_alloc = 0;
 794
 795 #undef getenv
 796 char *mingw_getenv(const char *name)
 797 {
 798         char *result = getenv(name);
 799         if (!result && !strcmp(name, "TMPDIR")) {
 800                 /* on Windows it is TMP and TEMP */
 801                 result = getenv("TMP");
 802                 if (!result)
 803                         result = getenv("TEMP");
 804         }
 805         else if (!result && !strcmp(name, "TERM")) {
 806                 /* simulate TERM to enable auto-color (see color.c) */
 807                 result = "winansi";
 808         }
 809         return result;
 810 }
 811
 812 int mingw_putenv(const char *namevalue)
 813 {
 814         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
 815         environ_size = do_putenv(environ, namevalue, environ_size, 1);
 816         return 0;
 817 }
 818
 819 /*
 820  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 821  * (Parsing C++ Command-Line Arguments)
 822  */
 823 static const char *quote_arg(const char *arg)
 824 {
 825         /* count chars to quote */
 826         int len = 0, n = 0;
 827         int force_quotes = 0;
 828         char *q, *d;
 829         const char *p = arg;
 830         if (!*p) force_quotes = 1;
 831         while (*p) {
 832                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 833                         force_quotes = 1;
 834                 else if (*p == '"')
 835                         n++;
 836                 else if (*p == '\\') {
 837                         int count = 0;
 838                         while (*p == '\\') {
 839                                 count++;
 840                                 p++;
 841                                 len++;
 842                         }
 843                         if (*p == '"')
 844                                 n += count*2 + 1;
 845                         continue;
 846                 }
 847                 len++;
 848                 p++;
 849         }
 850         if (!force_quotes && n == 0)
 851                 return arg;
 852
 853         /* insert \ where necessary */
 854         d = q = xmalloc(len+n+3);
 855         *d++ = '"';
 856         while (*arg) {
 857                 if (*arg == '"')
 858                         *d++ = '\\';
 859                 else if (*arg == '\\') {
 860                         int count = 0;
 861                         while (*arg == '\\') {
 862                                 count++;
 863                                 *d++ = *arg++;
 864                         }
 865                         if (*arg == '"') {
 866                                 while (count-- > 0)
 867                                         *d++ = '\\';
 868                                 *d++ = '\\';
 869                         }
 870                 }
 871                 *d++ = *arg++;
 872         }
 873         *d++ = '"';
 874         *d++ = 0;
 875         return q;
 876 }
 877
 878 static const char *parse_interpreter(const char *cmd)
 879 {
 880         static char buf[100];
 881         char *p, *opt;
 882         int n, fd;
 883
 884         /* don't even try a .exe */
 885         n = strlen(cmd);
 886         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 887                 return NULL;
 888
 889         fd = open(cmd, O_RDONLY);
 890         if (fd < 0)
 891                 return NULL;
 892         n = read(fd, buf, sizeof(buf)-1);
 893         close(fd);
 894         if (n < 4)      /* at least '#!/x' and not error */
 895                 return NULL;
 896
 897         if (buf[0] != '#' || buf[1] != '!')
 898                 return NULL;
 899         buf[n] = '\0';
 900         p = buf + strcspn(buf, "\r\n");
 901         if (!*p)
 902                 return NULL;
 903
 904         *p = '\0';
 905         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 906                 return NULL;
 907         /* strip options */
 908         if ((opt = strchr(p+1, ' ')))
 909                 *opt = '\0';
 910         return p+1;
 911 }
 912
 913 /*
 914  * Splits the PATH into parts.
 915  */
 916 static char **get_path_split(void)
 917 {
 918         char *p, **path, *envpath = getenv("PATH");
 919         int i, n = 0;
 920
 921         if (!envpath || !*envpath)
 922                 return NULL;
 923
 924         envpath = xstrdup(envpath);
 925         p = envpath;
 926         while (p) {
 927                 char *dir = p;
 928                 p = strchr(p, ';');
 929                 if (p) *p++ = '\0';
 930                 if (*dir) {     /* not earlier, catches series of ; */
 931                         ++n;
 932                 }
 933         }
 934         if (!n)
 935                 return NULL;
 936
 937         path = xmalloc((n+1)*sizeof(char *));
 938         p = envpath;
 939         i = 0;
 940         do {
 941                 if (*p)
 942                         path[i++] = xstrdup(p);
 943                 p = p+strlen(p)+1;
 944         } while (i < n);
 945         path[i] = NULL;
 946
 947         free(envpath);
 948
 949         return path;
 950 }
 951
 952 static void free_path_split(char **path)
 953 {
 954         char **p = path;
 955
 956         if (!path)
 957                 return;
 958
 959         while (*p)
 960                 free(*p++);
 961         free(path);
 962 }
 963
 964 /*
 965  * exe_only means that we only want to detect .exe files, but not scripts
 966  * (which do not have an extension)
 967  */
 968 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 969 {
 970         char path[MAX_PATH];
 971         wchar_t wpath[MAX_PATH];
 972         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 973
 974         if (xutftowcs_path(wpath, path) < 0)
 975                 return NULL;
 976
 977         if (!isexe && _waccess(wpath, F_OK) == 0)
 978                 return xstrdup(path);
 979         path[strlen(path)-4] = '\0';
 980         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
 981
 982                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY))
 983                         return xstrdup(path);
 984         }
 985         return NULL;
 986 }
 987
 988 /*
 989  * Determines the absolute path of cmd using the split path in path.
 990  * If cmd contains a slash or backslash, no lookup is performed.
 991  */
 992 static char *path_lookup(const char *cmd, char **path, int exe_only)
 993 {
 994         char *prog = NULL;
 995         int len = strlen(cmd);
 996         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 997
 998         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 999                 prog = xstrdup(cmd);
1000
1001         while (!prog && *path)
1002                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
1003
1004         return prog;
1005 }
1006
1007 /*
1008  * Create environment block suitable for CreateProcess. Merges current
1009  * process environment and the supplied environment changes.
1010  */
1011 static wchar_t *make_environment_block(char **deltaenv)
1012 {
1013         wchar_t *wenvblk = NULL;
1014         char **tmpenv;
1015         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1016
1017         while (deltaenv && deltaenv[i])
1018                 i++;
1019
1020         /* copy the environment, leaving space for changes */
1021         tmpenv = xmalloc((size + i) * sizeof(char*));
1022         memcpy(tmpenv, environ, size * sizeof(char*));
1023
1024         /* merge supplied environment changes into the temporary environment */
1025         for (i = 0; deltaenv && deltaenv[i]; i++)
1026                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1027
1028         /* environment must be sorted */
1029         qsort(tmpenv, size - 1, sizeof(char*), compareenv);
1030
1031         /* create environment block from temporary environment */
1032         for (i = 0; tmpenv[i]; i++) {
1033                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1034                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1035                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1036         }
1037         /* add final \0 terminator */
1038         wenvblk[wenvpos] = 0;
1039         free(tmpenv);
1040         return wenvblk;
1041 }
1042
1043 struct pinfo_t {
1044         struct pinfo_t *next;
1045         pid_t pid;
1046         HANDLE proc;
1047 } pinfo_t;
1048 struct pinfo_t *pinfo = NULL;
1049 CRITICAL_SECTION pinfo_cs;
1050
1051 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1052                               const char *dir,
1053                               int prepend_cmd, int fhin, int fhout, int fherr)
1054 {
1055         STARTUPINFOW si;
1056         PROCESS_INFORMATION pi;
1057         struct strbuf args;
1058         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1059         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1060         BOOL ret;
1061
1062         /* Determine whether or not we are associated to a console */
1063         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1064                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1065                         FILE_ATTRIBUTE_NORMAL, NULL);
1066         if (cons == INVALID_HANDLE_VALUE) {
1067                 /* There is no console associated with this process.
1068                  * Since the child is a console process, Windows
1069                  * would normally create a console window. But
1070                  * since we'll be redirecting std streams, we do
1071                  * not need the console.
1072                  * It is necessary to use DETACHED_PROCESS
1073                  * instead of CREATE_NO_WINDOW to make ssh
1074                  * recognize that it has no console.
1075                  */
1076                 flags |= DETACHED_PROCESS;
1077         } else {
1078                 /* There is already a console. If we specified
1079                  * DETACHED_PROCESS here, too, Windows would
1080                  * disassociate the child from the console.
1081                  * The same is true for CREATE_NO_WINDOW.
1082                  * Go figure!
1083                  */
1084                 CloseHandle(cons);
1085         }
1086         memset(&si, 0, sizeof(si));
1087         si.cb = sizeof(si);
1088         si.dwFlags = STARTF_USESTDHANDLES;
1089         si.hStdInput = winansi_get_osfhandle(fhin);
1090         si.hStdOutput = winansi_get_osfhandle(fhout);
1091         si.hStdError = winansi_get_osfhandle(fherr);
1092
1093         if (xutftowcs_path(wcmd, cmd) < 0)
1094                 return -1;
1095         if (dir && xutftowcs_path(wdir, dir) < 0)
1096                 return -1;
1097
1098         /* concatenate argv, quoting args as we go */
1099         strbuf_init(&args, 0);
1100         if (prepend_cmd) {
1101                 char *quoted = (char *)quote_arg(cmd);
1102                 strbuf_addstr(&args, quoted);
1103                 if (quoted != cmd)
1104                         free(quoted);
1105         }
1106         for (; *argv; argv++) {
1107                 char *quoted = (char *)quote_arg(*argv);
1108                 if (*args.buf)
1109                         strbuf_addch(&args, ' ');
1110                 strbuf_addstr(&args, quoted);
1111                 if (quoted != *argv)
1112                         free(quoted);
1113         }
1114
1115         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1116         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1117         strbuf_release(&args);
1118
1119         wenvblk = make_environment_block(deltaenv);
1120
1121         memset(&pi, 0, sizeof(pi));
1122         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1123                 wenvblk, dir ? wdir : NULL, &si, &pi);
1124
1125         free(wenvblk);
1126         free(wargs);
1127
1128         if (!ret) {
1129                 errno = ENOENT;
1130                 return -1;
1131         }
1132         CloseHandle(pi.hThread);
1133
1134         /*
1135          * The process ID is the human-readable identifier of the process
1136          * that we want to present in log and error messages. The handle
1137          * is not useful for this purpose. But we cannot close it, either,
1138          * because it is not possible to turn a process ID into a process
1139          * handle after the process terminated.
1140          * Keep the handle in a list for waitpid.
1141          */
1142         EnterCriticalSection(&pinfo_cs);
1143         {
1144                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1145                 info->pid = pi.dwProcessId;
1146                 info->proc = pi.hProcess;
1147                 info->next = pinfo;
1148                 pinfo = info;
1149         }
1150         LeaveCriticalSection(&pinfo_cs);
1151
1152         return (pid_t)pi.dwProcessId;
1153 }
1154
1155 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1156 {
1157         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1158 }
1159
1160 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1161                      const char *dir,
1162                      int fhin, int fhout, int fherr)
1163 {
1164         pid_t pid;
1165         char **path = get_path_split();
1166         char *prog = path_lookup(cmd, path, 0);
1167
1168         if (!prog) {
1169                 errno = ENOENT;
1170                 pid = -1;
1171         }
1172         else {
1173                 const char *interpr = parse_interpreter(prog);
1174
1175                 if (interpr) {
1176                         const char *argv0 = argv[0];
1177                         char *iprog = path_lookup(interpr, path, 1);
1178                         argv[0] = prog;
1179                         if (!iprog) {
1180                                 errno = ENOENT;
1181                                 pid = -1;
1182                         }
1183                         else {
1184                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1185                                                        fhin, fhout, fherr);
1186                                 free(iprog);
1187                         }
1188                         argv[0] = argv0;
1189                 }
1190                 else
1191                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1192                                                fhin, fhout, fherr);
1193                 free(prog);
1194         }
1195         free_path_split(path);
1196         return pid;
1197 }
1198
1199 static int try_shell_exec(const char *cmd, char *const *argv)
1200 {
1201         const char *interpr = parse_interpreter(cmd);
1202         char **path;
1203         char *prog;
1204         int pid = 0;
1205
1206         if (!interpr)
1207                 return 0;
1208         path = get_path_split();
1209         prog = path_lookup(interpr, path, 1);
1210         if (prog) {
1211                 int argc = 0;
1212                 const char **argv2;
1213                 while (argv[argc]) argc++;
1214                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1215                 argv2[0] = (char *)cmd; /* full path to the script file */
1216                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1217                 pid = mingw_spawnv(prog, argv2, 1);
1218                 if (pid >= 0) {
1219                         int status;
1220                         if (waitpid(pid, &status, 0) < 0)
1221                                 status = 255;
1222                         exit(status);
1223                 }
1224                 pid = 1;        /* indicate that we tried but failed */
1225                 free(prog);
1226                 free(argv2);
1227         }
1228         free_path_split(path);
1229         return pid;
1230 }
1231
1232 int mingw_execv(const char *cmd, char *const *argv)
1233 {
1234         /* check if git_command is a shell script */
1235         if (!try_shell_exec(cmd, argv)) {
1236                 int pid, status;
1237
1238                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1239                 if (pid < 0)
1240                         return -1;
1241                 if (waitpid(pid, &status, 0) < 0)
1242                         status = 255;
1243                 exit(status);
1244         }
1245         return -1;
1246 }
1247
1248 int mingw_execvp(const char *cmd, char *const *argv)
1249 {
1250         char **path = get_path_split();
1251         char *prog = path_lookup(cmd, path, 0);
1252
1253         if (prog) {
1254                 mingw_execv(prog, argv);
1255                 free(prog);
1256         } else
1257                 errno = ENOENT;
1258
1259         free_path_split(path);
1260         return -1;
1261 }
1262
1263 int mingw_kill(pid_t pid, int sig)
1264 {
1265         if (pid > 0 && sig == SIGTERM) {
1266                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1267
1268                 if (TerminateProcess(h, -1)) {
1269                         CloseHandle(h);
1270                         return 0;
1271                 }
1272
1273                 errno = err_win_to_posix(GetLastError());
1274                 CloseHandle(h);
1275                 return -1;
1276         }
1277
1278         errno = EINVAL;
1279         return -1;
1280 }
1281
1282 /*
1283  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1284  * that service contains a numerical port, or that it is null. It
1285  * does a simple search using gethostbyname, and returns one IPv4 host
1286  * if one was found.
1287  */
1288 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1289                                    const struct addrinfo *hints,
1290                                    struct addrinfo **res)
1291 {
1292         struct hostent *h = NULL;
1293         struct addrinfo *ai;
1294         struct sockaddr_in *sin;
1295
1296         if (node) {
1297                 h = gethostbyname(node);
1298                 if (!h)
1299                         return WSAGetLastError();
1300         }
1301
1302         ai = xmalloc(sizeof(struct addrinfo));
1303         *res = ai;
1304         ai->ai_flags = 0;
1305         ai->ai_family = AF_INET;
1306         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1307         switch (ai->ai_socktype) {
1308         case SOCK_STREAM:
1309                 ai->ai_protocol = IPPROTO_TCP;
1310                 break;
1311         case SOCK_DGRAM:
1312                 ai->ai_protocol = IPPROTO_UDP;
1313                 break;
1314         default:
1315                 ai->ai_protocol = 0;
1316                 break;
1317         }
1318         ai->ai_addrlen = sizeof(struct sockaddr_in);
1319         if (hints && (hints->ai_flags & AI_CANONNAME))
1320                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1321         else
1322                 ai->ai_canonname = NULL;
1323
1324         sin = xmalloc(ai->ai_addrlen);
1325         memset(sin, 0, ai->ai_addrlen);
1326         sin->sin_family = AF_INET;
1327         /* Note: getaddrinfo is supposed to allow service to be a string,
1328          * which should be looked up using getservbyname. This is
1329          * currently not implemented */
1330         if (service)
1331                 sin->sin_port = htons(atoi(service));
1332         if (h)
1333                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1334         else if (hints && (hints->ai_flags & AI_PASSIVE))
1335                 sin->sin_addr.s_addr = INADDR_ANY;
1336         else
1337                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1338         ai->ai_addr = (struct sockaddr *)sin;
1339         ai->ai_next = 0;
1340         return 0;
1341 }
1342
1343 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1344 {
1345         free(res->ai_canonname);
1346         free(res->ai_addr);
1347         free(res);
1348 }
1349
1350 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1351                                    char *host, DWORD hostlen,
1352                                    char *serv, DWORD servlen, int flags)
1353 {
1354         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1355         if (sa->sa_family != AF_INET)
1356                 return EAI_FAMILY;
1357         if (!host && !serv)
1358                 return EAI_NONAME;
1359
1360         if (host && hostlen > 0) {
1361                 struct hostent *ent = NULL;
1362                 if (!(flags & NI_NUMERICHOST))
1363                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1364                                             sizeof(sin->sin_addr), AF_INET);
1365
1366                 if (ent)
1367                         snprintf(host, hostlen, "%s", ent->h_name);
1368                 else if (flags & NI_NAMEREQD)
1369                         return EAI_NONAME;
1370                 else
1371                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1372         }
1373
1374         if (serv && servlen > 0) {
1375                 struct servent *ent = NULL;
1376                 if (!(flags & NI_NUMERICSERV))
1377                         ent = getservbyport(sin->sin_port,
1378                                             flags & NI_DGRAM ? "udp" : "tcp");
1379
1380                 if (ent)
1381                         snprintf(serv, servlen, "%s", ent->s_name);
1382                 else
1383                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1384         }
1385
1386         return 0;
1387 }
1388
1389 static HMODULE ipv6_dll = NULL;
1390 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1391 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1392                                       const struct addrinfo *hints,
1393                                       struct addrinfo **res);
1394 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1395                                       char *host, DWORD hostlen,
1396                                       char *serv, DWORD servlen, int flags);
1397 /*
1398  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1399  * don't need to try to load that one dynamically.
1400  */
1401
1402 static void socket_cleanup(void)
1403 {
1404         WSACleanup();
1405         if (ipv6_dll)
1406                 FreeLibrary(ipv6_dll);
1407         ipv6_dll = NULL;
1408         ipv6_freeaddrinfo = freeaddrinfo_stub;
1409         ipv6_getaddrinfo = getaddrinfo_stub;
1410         ipv6_getnameinfo = getnameinfo_stub;
1411 }
1412
1413 static void ensure_socket_initialization(void)
1414 {
1415         WSADATA wsa;
1416         static int initialized = 0;
1417         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1418         const char **name;
1419
1420         if (initialized)
1421                 return;
1422
1423         if (WSAStartup(MAKEWORD(2,2), &wsa))
1424                 die("unable to initialize winsock subsystem, error %d",
1425                         WSAGetLastError());
1426
1427         for (name = libraries; *name; name++) {
1428                 ipv6_dll = LoadLibrary(*name);
1429                 if (!ipv6_dll)
1430                         continue;
1431
1432                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1433                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1434                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1435                                                    const struct addrinfo *,
1436                                                    struct addrinfo **))
1437                         GetProcAddress(ipv6_dll, "getaddrinfo");
1438                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1439                                                    socklen_t, char *, DWORD,
1440                                                    char *, DWORD, int))
1441                         GetProcAddress(ipv6_dll, "getnameinfo");
1442                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1443                         FreeLibrary(ipv6_dll);
1444                         ipv6_dll = NULL;
1445                 } else
1446                         break;
1447         }
1448         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1449                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1450                 ipv6_getaddrinfo = getaddrinfo_stub;
1451                 ipv6_getnameinfo = getnameinfo_stub;
1452         }
1453
1454         atexit(socket_cleanup);
1455         initialized = 1;
1456 }
1457
1458 #undef gethostname
1459 int mingw_gethostname(char *name, int namelen)
1460 {
1461     ensure_socket_initialization();
1462     return gethostname(name, namelen);
1463 }
1464
1465 #undef gethostbyname
1466 struct hostent *mingw_gethostbyname(const char *host)
1467 {
1468         ensure_socket_initialization();
1469         return gethostbyname(host);
1470 }
1471
1472 void mingw_freeaddrinfo(struct addrinfo *res)
1473 {
1474         ipv6_freeaddrinfo(res);
1475 }
1476
1477 int mingw_getaddrinfo(const char *node, const char *service,
1478                       const struct addrinfo *hints, struct addrinfo **res)
1479 {
1480         ensure_socket_initialization();
1481         return ipv6_getaddrinfo(node, service, hints, res);
1482 }
1483
1484 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1485                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1486                       int flags)
1487 {
1488         ensure_socket_initialization();
1489         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1490 }
1491
1492 int mingw_socket(int domain, int type, int protocol)
1493 {
1494         int sockfd;
1495         SOCKET s;
1496
1497         ensure_socket_initialization();
1498         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1499         if (s == INVALID_SOCKET) {
1500                 /*
1501                  * WSAGetLastError() values are regular BSD error codes
1502                  * biased by WSABASEERR.
1503                  * However, strerror() does not know about networking
1504                  * specific errors, which are values beginning at 38 or so.
1505                  * Therefore, we choose to leave the biased error code
1506                  * in errno so that _if_ someone looks up the code somewhere,
1507                  * then it is at least the number that are usually listed.
1508                  */
1509                 errno = WSAGetLastError();
1510                 return -1;
1511         }
1512         /* convert into a file descriptor */
1513         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1514                 closesocket(s);
1515                 return error("unable to make a socket file descriptor: %s",
1516                         strerror(errno));
1517         }
1518         return sockfd;
1519 }
1520
1521 #undef connect
1522 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1523 {
1524         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1525         return connect(s, sa, sz);
1526 }
1527
1528 #undef bind
1529 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1530 {
1531         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1532         return bind(s, sa, sz);
1533 }
1534
1535 #undef setsockopt
1536 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1537 {
1538         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1539         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1540 }
1541
1542 #undef shutdown
1543 int mingw_shutdown(int sockfd, int how)
1544 {
1545         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1546         return shutdown(s, how);
1547 }
1548
1549 #undef listen
1550 int mingw_listen(int sockfd, int backlog)
1551 {
1552         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1553         return listen(s, backlog);
1554 }
1555
1556 #undef accept
1557 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1558 {
1559         int sockfd2;
1560
1561         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1562         SOCKET s2 = accept(s1, sa, sz);
1563
1564         /* convert into a file descriptor */
1565         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1566                 int err = errno;
1567                 closesocket(s2);
1568                 return error("unable to make a socket file descriptor: %s",
1569                         strerror(err));
1570         }
1571         return sockfd2;
1572 }
1573
1574 #undef rename
1575 int mingw_rename(const char *pold, const char *pnew)
1576 {
1577         DWORD attrs, gle;
1578         int tries = 0;
1579         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1580         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1581                 return -1;
1582
1583         /*
1584          * Try native rename() first to get errno right.
1585          * It is based on MoveFile(), which cannot overwrite existing files.
1586          */
1587         if (!_wrename(wpold, wpnew))
1588                 return 0;
1589         if (errno != EEXIST)
1590                 return -1;
1591 repeat:
1592         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1593                 return 0;
1594         /* TODO: translate more errors */
1595         gle = GetLastError();
1596         if (gle == ERROR_ACCESS_DENIED &&
1597             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1598                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1599                         errno = EISDIR;
1600                         return -1;
1601                 }
1602                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1603                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1604                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1605                                 return 0;
1606                         gle = GetLastError();
1607                         /* revert file attributes on failure */
1608                         SetFileAttributesW(wpnew, attrs);
1609                 }
1610         }
1611         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1612                 /*
1613                  * We assume that some other process had the source or
1614                  * destination file open at the wrong moment and retry.
1615                  * In order to give the other process a higher chance to
1616                  * complete its operation, we give up our time slice now.
1617                  * If we have to retry again, we do sleep a bit.
1618                  */
1619                 Sleep(delay[tries]);
1620                 tries++;
1621                 goto repeat;
1622         }
1623         if (gle == ERROR_ACCESS_DENIED &&
1624                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1625                        "Should I try again?", pold, pnew))
1626                 goto repeat;
1627
1628         errno = EACCES;
1629         return -1;
1630 }
1631
1632 /*
1633  * Note that this doesn't return the actual pagesize, but
1634  * the allocation granularity. If future Windows specific git code
1635  * needs the real getpagesize function, we need to find another solution.
1636  */
1637 int mingw_getpagesize(void)
1638 {
1639         SYSTEM_INFO si;
1640         GetSystemInfo(&si);
1641         return si.dwAllocationGranularity;
1642 }
1643
1644 struct passwd *getpwuid(int uid)
1645 {
1646         static char user_name[100];
1647         static struct passwd p;
1648
1649         DWORD len = sizeof(user_name);
1650         if (!GetUserName(user_name, &len))
1651                 return NULL;
1652         p.pw_name = user_name;
1653         p.pw_gecos = "unknown";
1654         p.pw_dir = NULL;
1655         return &p;
1656 }
1657
1658 static HANDLE timer_event;
1659 static HANDLE timer_thread;
1660 static int timer_interval;
1661 static int one_shot;
1662 static sig_handler_t timer_fn = SIG_DFL;
1663
1664 /* The timer works like this:
1665  * The thread, ticktack(), is a trivial routine that most of the time
1666  * only waits to receive the signal to terminate. The main thread tells
1667  * the thread to terminate by setting the timer_event to the signalled
1668  * state.
1669  * But ticktack() interrupts the wait state after the timer's interval
1670  * length to call the signal handler.
1671  */
1672
1673 static unsigned __stdcall ticktack(void *dummy)
1674 {
1675         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1676                 if (timer_fn == SIG_DFL)
1677                         die("Alarm");
1678                 if (timer_fn != SIG_IGN)
1679                         timer_fn(SIGALRM);
1680                 if (one_shot)
1681                         break;
1682         }
1683         return 0;
1684 }
1685
1686 static int start_timer_thread(void)
1687 {
1688         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1689         if (timer_event) {
1690                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1691                 if (!timer_thread )
1692                         return errno = ENOMEM,
1693                                 error("cannot start timer thread");
1694         } else
1695                 return errno = ENOMEM,
1696                         error("cannot allocate resources for timer");
1697         return 0;
1698 }
1699
1700 static void stop_timer_thread(void)
1701 {
1702         if (timer_event)
1703                 SetEvent(timer_event);  /* tell thread to terminate */
1704         if (timer_thread) {
1705                 int rc = WaitForSingleObject(timer_thread, 1000);
1706                 if (rc == WAIT_TIMEOUT)
1707                         error("timer thread did not terminate timely");
1708                 else if (rc != WAIT_OBJECT_0)
1709                         error("waiting for timer thread failed: %lu",
1710                               GetLastError());
1711                 CloseHandle(timer_thread);
1712         }
1713         if (timer_event)
1714                 CloseHandle(timer_event);
1715         timer_event = NULL;
1716         timer_thread = NULL;
1717 }
1718
1719 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1720 {
1721         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1722 }
1723
1724 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1725 {
1726         static const struct timeval zero;
1727         static int atexit_done;
1728
1729         if (out != NULL)
1730                 return errno = EINVAL,
1731                         error("setitimer param 3 != NULL not implemented");
1732         if (!is_timeval_eq(&in->it_interval, &zero) &&
1733             !is_timeval_eq(&in->it_interval, &in->it_value))
1734                 return errno = EINVAL,
1735                         error("setitimer: it_interval must be zero or eq it_value");
1736
1737         if (timer_thread)
1738                 stop_timer_thread();
1739
1740         if (is_timeval_eq(&in->it_value, &zero) &&
1741             is_timeval_eq(&in->it_interval, &zero))
1742                 return 0;
1743
1744         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1745         one_shot = is_timeval_eq(&in->it_interval, &zero);
1746         if (!atexit_done) {
1747                 atexit(stop_timer_thread);
1748                 atexit_done = 1;
1749         }
1750         return start_timer_thread();
1751 }
1752
1753 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1754 {
1755         if (sig != SIGALRM)
1756                 return errno = EINVAL,
1757                         error("sigaction only implemented for SIGALRM");
1758         if (out != NULL)
1759                 return errno = EINVAL,
1760                         error("sigaction: param 3 != NULL not implemented");
1761
1762         timer_fn = in->sa_handler;
1763         return 0;
1764 }
1765
1766 #undef signal
1767 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1768 {
1769         sig_handler_t old = timer_fn;
1770         if (sig != SIGALRM)
1771                 return signal(sig, handler);
1772         timer_fn = handler;
1773         return old;
1774 }
1775
1776 static const char *make_backslash_path(const char *path)
1777 {
1778         static char buf[PATH_MAX + 1];
1779         char *c;
1780
1781         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1782                 die("Too long path: %.*s", 60, path);
1783
1784         for (c = buf; *c; c++) {
1785                 if (*c == '/')
1786                         *c = '\\';
1787         }
1788         return buf;
1789 }
1790
1791 void mingw_open_html(const char *unixpath)
1792 {
1793         const char *htmlpath = make_backslash_path(unixpath);
1794         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1795                         const char *, const char *, const char *, INT);
1796         T ShellExecute;
1797         HMODULE shell32;
1798         int r;
1799
1800         shell32 = LoadLibrary("shell32.dll");
1801         if (!shell32)
1802                 die("cannot load shell32.dll");
1803         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1804         if (!ShellExecute)
1805                 die("cannot run browser");
1806
1807         printf("Launching default browser to display HTML ...\n");
1808         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1809         FreeLibrary(shell32);
1810         /* see the MSDN documentation referring to the result codes here */
1811         if (r <= 32) {
1812                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1813         }
1814 }
1815
1816 int link(const char *oldpath, const char *newpath)
1817 {
1818         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1819         static T create_hard_link = NULL;
1820         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1821         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1822                 xutftowcs_path(wnewpath, newpath) < 0)
1823                 return -1;
1824
1825         if (!create_hard_link) {
1826                 create_hard_link = (T) GetProcAddress(
1827                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1828                 if (!create_hard_link)
1829                         create_hard_link = (T)-1;
1830         }
1831         if (create_hard_link == (T)-1) {
1832                 errno = ENOSYS;
1833                 return -1;
1834         }
1835         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1836                 errno = err_win_to_posix(GetLastError());
1837                 return -1;
1838         }
1839         return 0;
1840 }
1841
1842 char *getpass(const char *prompt)
1843 {
1844         struct strbuf buf = STRBUF_INIT;
1845
1846         fputs(prompt, stderr);
1847         for (;;) {
1848                 char c = _getch();
1849                 if (c == '\r' || c == '\n')
1850                         break;
1851                 strbuf_addch(&buf, c);
1852         }
1853         fputs("\n", stderr);
1854         return strbuf_detach(&buf, NULL);
1855 }
1856
1857 pid_t waitpid(pid_t pid, int *status, int options)
1858 {
1859         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1860             FALSE, pid);
1861         if (!h) {
1862                 errno = ECHILD;
1863                 return -1;
1864         }
1865
1866         if (pid > 0 && options & WNOHANG) {
1867                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1868                         CloseHandle(h);
1869                         return 0;
1870                 }
1871                 options &= ~WNOHANG;
1872         }
1873
1874         if (options == 0) {
1875                 struct pinfo_t **ppinfo;
1876                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1877                         CloseHandle(h);
1878                         return 0;
1879                 }
1880
1881                 if (status)
1882                         GetExitCodeProcess(h, (LPDWORD)status);
1883
1884                 EnterCriticalSection(&pinfo_cs);
1885
1886                 ppinfo = &pinfo;
1887                 while (*ppinfo) {
1888                         struct pinfo_t *info = *ppinfo;
1889                         if (info->pid == pid) {
1890                                 CloseHandle(info->proc);
1891                                 *ppinfo = info->next;
1892                                 free(info);
1893                                 break;
1894                         }
1895                         ppinfo = &info->next;
1896                 }
1897
1898                 LeaveCriticalSection(&pinfo_cs);
1899
1900                 CloseHandle(h);
1901                 return pid;
1902         }
1903         CloseHandle(h);
1904
1905         errno = EINVAL;
1906         return -1;
1907 }
1908
1909 const char *get_windows_home_directory(void)
1910 {
1911         static const char *home_directory = NULL;
1912         struct strbuf buf = STRBUF_INIT;
1913
1914         if (home_directory)
1915                 return home_directory;
1916
1917         home_directory = getenv("HOME");
1918         if (home_directory && *home_directory)
1919                 return home_directory;
1920
1921         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1922         home_directory = strbuf_detach(&buf, NULL);
1923
1924         return home_directory;
1925 }
1926
1927 int mingw_offset_1st_component(const char *path)
1928 {
1929         int offset = 0;
1930         if (has_dos_drive_prefix(path))
1931                 offset = 2;
1932
1933         /* unc paths */
1934         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1935
1936                 /* skip server name */
1937                 char *pos = strpbrk(path + 2, "\\/");
1938                 if (!pos)
1939                         return 0; /* Error: malformed unc path */
1940
1941                 do {
1942                         pos++;
1943                 } while (*pos && !is_dir_sep(*pos));
1944
1945                 offset = pos - path;
1946         }
1947
1948         return offset + is_dir_sep(path[offset]);
1949 }
1950
1951 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1952 {
1953         int upos = 0, wpos = 0;
1954         const unsigned char *utf = (const unsigned char*) utfs;
1955         if (!utf || !wcs || wcslen < 1) {
1956                 errno = EINVAL;
1957                 return -1;
1958         }
1959         /* reserve space for \0 */
1960         wcslen--;
1961         if (utflen < 0)
1962                 utflen = INT_MAX;
1963
1964         while (upos < utflen) {
1965                 int c = utf[upos++] & 0xff;
1966                 if (utflen == INT_MAX && c == 0)
1967                         break;
1968
1969                 if (wpos >= wcslen) {
1970                         wcs[wpos] = 0;
1971                         errno = ERANGE;
1972                         return -1;
1973                 }
1974
1975                 if (c < 0x80) {
1976                         /* ASCII */
1977                         wcs[wpos++] = c;
1978                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1979                                 (utf[upos] & 0xc0) == 0x80) {
1980                         /* 2-byte utf-8 */
1981                         c = ((c & 0x1f) << 6);
1982                         c |= (utf[upos++] & 0x3f);
1983                         wcs[wpos++] = c;
1984                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1985                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1986                                 (utf[upos] & 0xc0) == 0x80 &&
1987                                 (utf[upos + 1] & 0xc0) == 0x80) {
1988                         /* 3-byte utf-8 */
1989                         c = ((c & 0x0f) << 12);
1990                         c |= ((utf[upos++] & 0x3f) << 6);
1991                         c |= (utf[upos++] & 0x3f);
1992                         wcs[wpos++] = c;
1993                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
1994                                 wpos + 1 < wcslen &&
1995                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
1996                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
1997                                 (utf[upos] & 0xc0) == 0x80 &&
1998                                 (utf[upos + 1] & 0xc0) == 0x80 &&
1999                                 (utf[upos + 2] & 0xc0) == 0x80) {
2000                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2001                         c = ((c & 0x07) << 18);
2002                         c |= ((utf[upos++] & 0x3f) << 12);
2003                         c |= ((utf[upos++] & 0x3f) << 6);
2004                         c |= (utf[upos++] & 0x3f);
2005                         c -= 0x10000;
2006                         wcs[wpos++] = 0xd800 | (c >> 10);
2007                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2008                 } else if (c >= 0xa0) {
2009                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2010                         wcs[wpos++] = c;
2011                 } else {
2012                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2013                         static const char *hex = "0123456789abcdef";
2014                         wcs[wpos++] = hex[c >> 4];
2015                         if (wpos < wcslen)
2016                                 wcs[wpos++] = hex[c & 0x0f];
2017                 }
2018         }
2019         wcs[wpos] = 0;
2020         return wpos;
2021 }
2022
2023 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2024 {
2025         if (!wcs || !utf || utflen < 1) {
2026                 errno = EINVAL;
2027                 return -1;
2028         }
2029         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2030         if (utflen)
2031                 return utflen - 1;
2032         errno = ERANGE;
2033         return -1;
2034 }
2035
2036 /*
2037  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2038  * mingw startup code, see init.c in mingw runtime).
2039  */
2040 int _CRT_glob = 0;
2041
2042 typedef struct {
2043         int newmode;
2044 } _startupinfo;
2045
2046 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2047                 _startupinfo *si);
2048
2049 void mingw_startup()
2050 {
2051         int i, len, maxlen, argc;
2052         char *buffer;
2053         wchar_t **wenv, **wargv;
2054         _startupinfo si;
2055
2056         /* get wide char arguments and environment */
2057         si.newmode = 0;
2058         __wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si);
2059
2060         /* determine size of argv and environ conversion buffer */
2061         maxlen = wcslen(_wpgmptr);
2062         for (i = 1; i < argc; i++)
2063                 maxlen = max(maxlen, wcslen(wargv[i]));
2064         for (i = 0; wenv[i]; i++)
2065                 maxlen = max(maxlen, wcslen(wenv[i]));
2066
2067         /* nedmalloc can't free CRT memory, allocate resizable environment list */
2068         environ = NULL;
2069         environ_size = i + 1;
2070         ALLOC_GROW(environ, environ_size * sizeof(char*), environ_alloc);
2071
2072         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2073         maxlen = 3 * maxlen + 1;
2074         buffer = xmalloc(maxlen);
2075
2076         /* convert command line arguments and environment to UTF-8 */
2077         len = xwcstoutf(buffer, _wpgmptr, maxlen);
2078         __argv[0] = xmemdupz(buffer, len);
2079         for (i = 1; i < argc; i++) {
2080                 len = xwcstoutf(buffer, wargv[i], maxlen);
2081                 __argv[i] = xmemdupz(buffer, len);
2082         }
2083         for (i = 0; wenv[i]; i++) {
2084                 len = xwcstoutf(buffer, wenv[i], maxlen);
2085                 environ[i] = xmemdupz(buffer, len);
2086         }
2087         environ[i] = NULL;
2088         free(buffer);
2089
2090         /* initialize critical section for waitpid pinfo_t list */
2091         InitializeCriticalSection(&pinfo_cs);
2092
2093         /* set up default file mode and file modes for stdin/out/err */
2094         _fmode = _O_BINARY;
2095         _setmode(_fileno(stdin), _O_BINARY);
2096         _setmode(_fileno(stdout), _O_BINARY);
2097         _setmode(_fileno(stderr), _O_BINARY);
2098
2099         /* initialize Unicode console */
2100         winansi_init();
2101 }