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] = mingw_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                         DWORD err = GetLastError();
 248                         FindClose(handle);
 249                         return err == ERROR_NO_MORE_FILES;
 250                 }
 251         FindClose(handle);
 252         return 0;
 253 }
 254
 255 int mingw_rmdir(const char *pathname)
 256 {
 257         int ret, tries = 0;
 258         wchar_t wpathname[MAX_PATH];
 259         if (xutftowcs_path(wpathname, pathname) < 0)
 260                 return -1;
 261
 262         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 263                 if (!is_file_in_use_error(GetLastError()))
 264                         errno = err_win_to_posix(GetLastError());
 265                 if (errno != EACCES)
 266                         break;
 267                 if (!is_dir_empty(wpathname)) {
 268                         errno = ENOTEMPTY;
 269                         break;
 270                 }
 271                 /*
 272                  * We assume that some other process had the source or
 273                  * destination file open at the wrong moment and retry.
 274                  * In order to give the other process a higher chance to
 275                  * complete its operation, we give up our time slice now.
 276                  * If we have to retry again, we do sleep a bit.
 277                  */
 278                 Sleep(delay[tries]);
 279                 tries++;
 280         }
 281         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 282                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 283                         "Should I try again?", pathname))
 284                ret = _wrmdir(wpathname);
 285         return ret;
 286 }
 287
 288 static int make_hidden(const wchar_t *path)
 289 {
 290         DWORD attribs = GetFileAttributesW(path);
 291         if (SetFileAttributesW(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 292                 return 0;
 293         errno = err_win_to_posix(GetLastError());
 294         return -1;
 295 }
 296
 297 void mingw_mark_as_git_dir(const char *dir)
 298 {
 299         wchar_t wdir[MAX_PATH];
 300         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository())
 301                 if (xutftowcs_path(wdir, dir) < 0 || make_hidden(wdir))
 302                         warning("Failed to make '%s' hidden", dir);
 303         git_config_set("core.hideDotFiles",
 304                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 305                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 306                  "dotGitOnly" : "true"));
 307 }
 308
 309 int mingw_mkdir(const char *path, int mode)
 310 {
 311         int ret;
 312         wchar_t wpath[MAX_PATH];
 313         if (xutftowcs_path(wpath, path) < 0)
 314                 return -1;
 315         ret = _wmkdir(wpath);
 316         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 317                 /*
 318                  * In Windows a file or dir starting with a dot is not
 319                  * automatically hidden. So lets mark it as hidden when
 320                  * such a directory is created.
 321                  */
 322                 const char *start = basename((char*)path);
 323                 if (*start == '.')
 324                         return make_hidden(wpath);
 325         }
 326         return ret;
 327 }
 328
 329 int mingw_open (const char *filename, int oflags, ...)
 330 {
 331         va_list args;
 332         unsigned mode;
 333         int fd;
 334         wchar_t wfilename[MAX_PATH];
 335
 336         va_start(args, oflags);
 337         mode = va_arg(args, int);
 338         va_end(args);
 339
 340         if (filename && !strcmp(filename, "/dev/null"))
 341                 filename = "nul";
 342
 343         if (xutftowcs_path(wfilename, filename) < 0)
 344                 return -1;
 345         fd = _wopen(wfilename, oflags, mode);
 346
 347         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 348                 DWORD attrs = GetFileAttributesW(wfilename);
 349                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 350                         errno = EISDIR;
 351         }
 352         if ((oflags & O_CREAT) && fd >= 0 &&
 353             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 354                 /*
 355                  * In Windows a file or dir starting with a dot is not
 356                  * automatically hidden. So lets mark it as hidden when
 357                  * such a file is created.
 358                  */
 359                 const char *start = basename((char*)filename);
 360                 if (*start == '.' && make_hidden(wfilename))
 361                         warning("Could not mark '%s' as hidden.", filename);
 362         }
 363         return fd;
 364 }
 365
 366 static BOOL WINAPI ctrl_ignore(DWORD type)
 367 {
 368         return TRUE;
 369 }
 370
 371 #undef fgetc
 372 int mingw_fgetc(FILE *stream)
 373 {
 374         int ch;
 375         if (!isatty(_fileno(stream)))
 376                 return fgetc(stream);
 377
 378         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 379         while (1) {
 380                 ch = fgetc(stream);
 381                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 382                         break;
 383
 384                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 385                 mingw_raise(SIGINT);
 386         }
 387         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 388         return ch;
 389 }
 390
 391 #undef fopen
 392 FILE *mingw_fopen (const char *filename, const char *otype)
 393 {
 394         int hide = 0;
 395         FILE *file;
 396         wchar_t wfilename[MAX_PATH], wotype[4];
 397         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 398             basename((char*)filename)[0] == '.')
 399                 hide = access(filename, F_OK);
 400         if (filename && !strcmp(filename, "/dev/null"))
 401                 filename = "nul";
 402         if (xutftowcs_path(wfilename, filename) < 0 ||
 403                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 404                 return NULL;
 405         file = _wfopen(wfilename, wotype);
 406         if (file && hide && make_hidden(wfilename))
 407                 warning("Could not mark '%s' as hidden.", filename);
 408         return file;
 409 }
 410
 411 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 412 {
 413         int hide = 0;
 414         FILE *file;
 415         wchar_t wfilename[MAX_PATH], wotype[4];
 416         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 417             basename((char*)filename)[0] == '.')
 418                 hide = access(filename, F_OK);
 419         if (filename && !strcmp(filename, "/dev/null"))
 420                 filename = "nul";
 421         if (xutftowcs_path(wfilename, filename) < 0 ||
 422                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 423                 return NULL;
 424         file = _wfreopen(wfilename, wotype, stream);
 425         if (file && hide && make_hidden(wfilename))
 426                 warning("Could not mark '%s' as hidden.", filename);
 427         return file;
 428 }
 429
 430 #undef fflush
 431 int mingw_fflush(FILE *stream)
 432 {
 433         int ret = fflush(stream);
 434
 435         /*
 436          * write() is used behind the scenes of stdio output functions.
 437          * Since git code does not check for errors after each stdio write
 438          * operation, it can happen that write() is called by a later
 439          * stdio function even if an earlier write() call failed. In the
 440          * case of a pipe whose readable end was closed, only the first
 441          * call to write() reports EPIPE on Windows. Subsequent write()
 442          * calls report EINVAL. It is impossible to notice whether this
 443          * fflush invocation triggered such a case, therefore, we have to
 444          * catch all EINVAL errors whole-sale.
 445          */
 446         if (ret && errno == EINVAL)
 447                 errno = EPIPE;
 448
 449         return ret;
 450 }
 451
 452 int mingw_access(const char *filename, int mode)
 453 {
 454         wchar_t wfilename[MAX_PATH];
 455         if (xutftowcs_path(wfilename, filename) < 0)
 456                 return -1;
 457         /* X_OK is not supported by the MSVCRT version */
 458         return _waccess(wfilename, mode & ~X_OK);
 459 }
 460
 461 int mingw_chdir(const char *dirname)
 462 {
 463         wchar_t wdirname[MAX_PATH];
 464         if (xutftowcs_path(wdirname, dirname) < 0)
 465                 return -1;
 466         return _wchdir(wdirname);
 467 }
 468
 469 int mingw_chmod(const char *filename, int mode)
 470 {
 471         wchar_t wfilename[MAX_PATH];
 472         if (xutftowcs_path(wfilename, filename) < 0)
 473                 return -1;
 474         return _wchmod(wfilename, mode);
 475 }
 476
 477 /* We keep the do_lstat code in a separate function to avoid recursion.
 478  * When a path ends with a slash, the stat will fail with ENOENT. In
 479  * this case, we strip the trailing slashes and stat again.
 480  *
 481  * If follow is true then act like stat() and report on the link
 482  * target. Otherwise report on the link itself.
 483  */
 484 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 485 {
 486         WIN32_FILE_ATTRIBUTE_DATA fdata;
 487         wchar_t wfilename[MAX_PATH];
 488         if (xutftowcs_path(wfilename, file_name) < 0)
 489                 return -1;
 490
 491         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 492                 buf->st_ino = 0;
 493                 buf->st_gid = 0;
 494                 buf->st_uid = 0;
 495                 buf->st_nlink = 1;
 496                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 497                 buf->st_size = fdata.nFileSizeLow |
 498                         (((off_t)fdata.nFileSizeHigh)<<32);
 499                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 500                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 501                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 502                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 503                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 504                         WIN32_FIND_DATAW findbuf;
 505                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 506                         if (handle != INVALID_HANDLE_VALUE) {
 507                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 508                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 509                                         if (follow) {
 510                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 511                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 512                                         } else {
 513                                                 buf->st_mode = S_IFLNK;
 514                                         }
 515                                         buf->st_mode |= S_IREAD;
 516                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 517                                                 buf->st_mode |= S_IWRITE;
 518                                 }
 519                                 FindClose(handle);
 520                         }
 521                 }
 522                 return 0;
 523         }
 524         switch (GetLastError()) {
 525         case ERROR_ACCESS_DENIED:
 526         case ERROR_SHARING_VIOLATION:
 527         case ERROR_LOCK_VIOLATION:
 528         case ERROR_SHARING_BUFFER_EXCEEDED:
 529                 errno = EACCES;
 530                 break;
 531         case ERROR_BUFFER_OVERFLOW:
 532                 errno = ENAMETOOLONG;
 533                 break;
 534         case ERROR_NOT_ENOUGH_MEMORY:
 535                 errno = ENOMEM;
 536                 break;
 537         default:
 538                 errno = ENOENT;
 539                 break;
 540         }
 541         return -1;
 542 }
 543
 544 /* We provide our own lstat/fstat functions, since the provided
 545  * lstat/fstat functions are so slow. These stat functions are
 546  * tailored for Git's usage (read: fast), and are not meant to be
 547  * complete. Note that Git stat()s are redirected to mingw_lstat()
 548  * too, since Windows doesn't really handle symlinks that well.
 549  */
 550 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 551 {
 552         int namelen;
 553         char alt_name[PATH_MAX];
 554
 555         if (!do_lstat(follow, file_name, buf))
 556                 return 0;
 557
 558         /* if file_name ended in a '/', Windows returned ENOENT;
 559          * try again without trailing slashes
 560          */
 561         if (errno != ENOENT)
 562                 return -1;
 563
 564         namelen = strlen(file_name);
 565         if (namelen && file_name[namelen-1] != '/')
 566                 return -1;
 567         while (namelen && file_name[namelen-1] == '/')
 568                 --namelen;
 569         if (!namelen || namelen >= PATH_MAX)
 570                 return -1;
 571
 572         memcpy(alt_name, file_name, namelen);
 573         alt_name[namelen] = 0;
 574         return do_lstat(follow, alt_name, buf);
 575 }
 576
 577 int (*lstat)(const char *file_name, struct stat *buf) = mingw_lstat;
 578
 579 int mingw_lstat(const char *file_name, struct stat *buf)
 580 {
 581         return do_stat_internal(0, file_name, buf);
 582 }
 583 int mingw_stat(const char *file_name, struct stat *buf)
 584 {
 585         return do_stat_internal(1, file_name, buf);
 586 }
 587
 588 int mingw_fstat(int fd, struct stat *buf)
 589 {
 590         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 591         BY_HANDLE_FILE_INFORMATION fdata;
 592
 593         if (fh == INVALID_HANDLE_VALUE) {
 594                 errno = EBADF;
 595                 return -1;
 596         }
 597         /* direct non-file handles to MS's fstat() */
 598         if (GetFileType(fh) != FILE_TYPE_DISK)
 599                 return _fstati64(fd, buf);
 600
 601         if (GetFileInformationByHandle(fh, &fdata)) {
 602                 buf->st_ino = 0;
 603                 buf->st_gid = 0;
 604                 buf->st_uid = 0;
 605                 buf->st_nlink = 1;
 606                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 607                 buf->st_size = fdata.nFileSizeLow |
 608                         (((off_t)fdata.nFileSizeHigh)<<32);
 609                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 610                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 611                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 612                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 613                 return 0;
 614         }
 615         errno = EBADF;
 616         return -1;
 617 }
 618
 619 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 620 {
 621         long long winTime = t * 10000000LL + 116444736000000000LL;
 622         ft->dwLowDateTime = winTime;
 623         ft->dwHighDateTime = winTime >> 32;
 624 }
 625
 626 int mingw_utime (const char *file_name, const struct utimbuf *times)
 627 {
 628         FILETIME mft, aft;
 629         int fh, rc;
 630         DWORD attrs;
 631         wchar_t wfilename[MAX_PATH];
 632         if (xutftowcs_path(wfilename, file_name) < 0)
 633                 return -1;
 634
 635         /* must have write permission */
 636         attrs = GetFileAttributesW(wfilename);
 637         if (attrs != INVALID_FILE_ATTRIBUTES &&
 638             (attrs & FILE_ATTRIBUTE_READONLY)) {
 639                 /* ignore errors here; open() will report them */
 640                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 641         }
 642
 643         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 644                 rc = -1;
 645                 goto revert_attrs;
 646         }
 647
 648         if (times) {
 649                 time_t_to_filetime(times->modtime, &mft);
 650                 time_t_to_filetime(times->actime, &aft);
 651         } else {
 652                 GetSystemTimeAsFileTime(&mft);
 653                 aft = mft;
 654         }
 655         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 656                 errno = EINVAL;
 657                 rc = -1;
 658         } else
 659                 rc = 0;
 660         close(fh);
 661
 662 revert_attrs:
 663         if (attrs != INVALID_FILE_ATTRIBUTES &&
 664             (attrs & FILE_ATTRIBUTE_READONLY)) {
 665                 /* ignore errors again */
 666                 SetFileAttributesW(wfilename, attrs);
 667         }
 668         return rc;
 669 }
 670
 671 unsigned int sleep (unsigned int seconds)
 672 {
 673         Sleep(seconds*1000);
 674         return 0;
 675 }
 676
 677 char *mingw_mktemp(char *template)
 678 {
 679         wchar_t wtemplate[MAX_PATH];
 680         if (xutftowcs_path(wtemplate, template) < 0)
 681                 return NULL;
 682         if (!_wmktemp(wtemplate))
 683                 return NULL;
 684         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 685                 return NULL;
 686         return template;
 687 }
 688
 689 int mkstemp(char *template)
 690 {
 691         char *filename = mktemp(template);
 692         if (filename == NULL)
 693                 return -1;
 694         return open(filename, O_RDWR | O_CREAT, 0600);
 695 }
 696
 697 int gettimeofday(struct timeval *tv, void *tz)
 698 {
 699         FILETIME ft;
 700         long long hnsec;
 701
 702         GetSystemTimeAsFileTime(&ft);
 703         hnsec = filetime_to_hnsec(&ft);
 704         tv->tv_sec = hnsec / 10000000;
 705         tv->tv_usec = (hnsec % 10000000) / 10;
 706         return 0;
 707 }
 708
 709 int pipe(int filedes[2])
 710 {
 711         HANDLE h[2];
 712
 713         /* this creates non-inheritable handles */
 714         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 715                 errno = err_win_to_posix(GetLastError());
 716                 return -1;
 717         }
 718         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 719         if (filedes[0] < 0) {
 720                 CloseHandle(h[0]);
 721                 CloseHandle(h[1]);
 722                 return -1;
 723         }
 724         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 725         if (filedes[0] < 0) {
 726                 close(filedes[0]);
 727                 CloseHandle(h[1]);
 728                 return -1;
 729         }
 730         return 0;
 731 }
 732
 733 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 734 {
 735         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 736         memcpy(result, gmtime(timep), sizeof(struct tm));
 737         return result;
 738 }
 739
 740 struct tm *localtime_r(const time_t *timep, struct tm *result)
 741 {
 742         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 743         memcpy(result, localtime(timep), sizeof(struct tm));
 744         return result;
 745 }
 746
 747 char *mingw_getcwd(char *pointer, int len)
 748 {
 749         int i;
 750         wchar_t wpointer[MAX_PATH];
 751         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 752                 return NULL;
 753         if (xwcstoutf(pointer, wpointer, len) < 0)
 754                 return NULL;
 755         for (i = 0; pointer[i]; i++)
 756                 if (pointer[i] == '\\')
 757                         pointer[i] = '/';
 758         return pointer;
 759 }
 760
 761 /*
 762  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 763  * (Parsing C++ Command-Line Arguments)
 764  */
 765 static const char *quote_arg(const char *arg)
 766 {
 767         /* count chars to quote */
 768         int len = 0, n = 0;
 769         int force_quotes = 0;
 770         char *q, *d;
 771         const char *p = arg;
 772         if (!*p) force_quotes = 1;
 773         while (*p) {
 774                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 775                         force_quotes = 1;
 776                 else if (*p == '"')
 777                         n++;
 778                 else if (*p == '\\') {
 779                         int count = 0;
 780                         while (*p == '\\') {
 781                                 count++;
 782                                 p++;
 783                                 len++;
 784                         }
 785                         if (*p == '"')
 786                                 n += count*2 + 1;
 787                         continue;
 788                 }
 789                 len++;
 790                 p++;
 791         }
 792         if (!force_quotes && n == 0)
 793                 return arg;
 794
 795         /* insert \ where necessary */
 796         d = q = xmalloc(len+n+3);
 797         *d++ = '"';
 798         while (*arg) {
 799                 if (*arg == '"')
 800                         *d++ = '\\';
 801                 else if (*arg == '\\') {
 802                         int count = 0;
 803                         while (*arg == '\\') {
 804                                 count++;
 805                                 *d++ = *arg++;
 806                         }
 807                         if (*arg == '"') {
 808                                 while (count-- > 0)
 809                                         *d++ = '\\';
 810                                 *d++ = '\\';
 811                         }
 812                 }
 813                 *d++ = *arg++;
 814         }
 815         *d++ = '"';
 816         *d++ = 0;
 817         return q;
 818 }
 819
 820 static const char *parse_interpreter(const char *cmd)
 821 {
 822         static char buf[100];
 823         char *p, *opt;
 824         int n, fd;
 825
 826         /* don't even try a .exe */
 827         n = strlen(cmd);
 828         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 829                 return NULL;
 830
 831         fd = open(cmd, O_RDONLY);
 832         if (fd < 0)
 833                 return NULL;
 834         n = read(fd, buf, sizeof(buf)-1);
 835         close(fd);
 836         if (n < 4)      /* at least '#!/x' and not error */
 837                 return NULL;
 838
 839         if (buf[0] != '#' || buf[1] != '!')
 840                 return NULL;
 841         buf[n] = '\0';
 842         p = buf + strcspn(buf, "\r\n");
 843         if (!*p)
 844                 return NULL;
 845
 846         *p = '\0';
 847         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 848                 return NULL;
 849         /* strip options */
 850         if ((opt = strchr(p+1, ' ')))
 851                 *opt = '\0';
 852         return p+1;
 853 }
 854
 855 /*
 856  * Splits the PATH into parts.
 857  */
 858 static char **get_path_split(void)
 859 {
 860         char *p, **path, *envpath = mingw_getenv("PATH");
 861         int i, n = 0;
 862
 863         if (!envpath || !*envpath)
 864                 return NULL;
 865
 866         envpath = xstrdup(envpath);
 867         p = envpath;
 868         while (p) {
 869                 char *dir = p;
 870                 p = strchr(p, ';');
 871                 if (p) *p++ = '\0';
 872                 if (*dir) {     /* not earlier, catches series of ; */
 873                         ++n;
 874                 }
 875         }
 876         if (!n)
 877                 return NULL;
 878
 879         path = xmalloc((n+1)*sizeof(char *));
 880         p = envpath;
 881         i = 0;
 882         do {
 883                 if (*p)
 884                         path[i++] = xstrdup(p);
 885                 p = p+strlen(p)+1;
 886         } while (i < n);
 887         path[i] = NULL;
 888
 889         free(envpath);
 890
 891         return path;
 892 }
 893
 894 static void free_path_split(char **path)
 895 {
 896         char **p = path;
 897
 898         if (!path)
 899                 return;
 900
 901         while (*p)
 902                 free(*p++);
 903         free(path);
 904 }
 905
 906 /*
 907  * exe_only means that we only want to detect .exe files, but not scripts
 908  * (which do not have an extension)
 909  */
 910 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 911 {
 912         char path[MAX_PATH];
 913         wchar_t wpath[MAX_PATH];
 914         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 915
 916         if (xutftowcs_path(wpath, path) < 0)
 917                 return NULL;
 918
 919         if (!isexe && _waccess(wpath, F_OK) == 0)
 920                 return xstrdup(path);
 921         wpath[wcslen(wpath)-4] = '\0';
 922         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
 923                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
 924                         path[strlen(path)-4] = '\0';
 925                         return xstrdup(path);
 926                 }
 927         }
 928         return NULL;
 929 }
 930
 931 /*
 932  * Determines the absolute path of cmd using the split path in path.
 933  * If cmd contains a slash or backslash, no lookup is performed.
 934  */
 935 static char *path_lookup(const char *cmd, char **path, int exe_only)
 936 {
 937         char *prog = NULL;
 938         int len = strlen(cmd);
 939         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 940
 941         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 942                 prog = xstrdup(cmd);
 943
 944         while (!prog && *path)
 945                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 946
 947         return prog;
 948 }
 949
 950 static int do_putenv(char **env, const char *name, int size, int free_old);
 951
 952 /* used number of elements of environ array, including terminating NULL */
 953 static int environ_size = 0;
 954 /* allocated size of environ array, in bytes */
 955 static int environ_alloc = 0;
 956
 957 /*
 958  * Create environment block suitable for CreateProcess. Merges current
 959  * process environment and the supplied environment changes.
 960  */
 961 static wchar_t *make_environment_block(char **deltaenv)
 962 {
 963         wchar_t *wenvblk = NULL;
 964         char **tmpenv;
 965         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
 966
 967         while (deltaenv && deltaenv[i])
 968                 i++;
 969
 970         /* copy the environment, leaving space for changes */
 971         tmpenv = xmalloc((size + i) * sizeof(char*));
 972         memcpy(tmpenv, environ, size * sizeof(char*));
 973
 974         /* merge supplied environment changes into the temporary environment */
 975         for (i = 0; deltaenv && deltaenv[i]; i++)
 976                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
 977
 978         /* create environment block from temporary environment */
 979         for (i = 0; tmpenv[i]; i++) {
 980                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
 981                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
 982                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
 983         }
 984         /* add final \0 terminator */
 985         wenvblk[wenvpos] = 0;
 986         free(tmpenv);
 987         return wenvblk;
 988 }
 989
 990 struct pinfo_t {
 991         struct pinfo_t *next;
 992         pid_t pid;
 993         HANDLE proc;
 994 };
 995 static struct pinfo_t *pinfo = NULL;
 996 CRITICAL_SECTION pinfo_cs;
 997
 998 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
 999                               const char *dir,
1000                               int prepend_cmd, int fhin, int fhout, int fherr)
1001 {
1002         STARTUPINFOW si;
1003         PROCESS_INFORMATION pi;
1004         struct strbuf args;
1005         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1006         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1007         BOOL ret;
1008
1009         /* Determine whether or not we are associated to a console */
1010         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1011                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1012                         FILE_ATTRIBUTE_NORMAL, NULL);
1013         if (cons == INVALID_HANDLE_VALUE) {
1014                 /* There is no console associated with this process.
1015                  * Since the child is a console process, Windows
1016                  * would normally create a console window. But
1017                  * since we'll be redirecting std streams, we do
1018                  * not need the console.
1019                  * It is necessary to use DETACHED_PROCESS
1020                  * instead of CREATE_NO_WINDOW to make ssh
1021                  * recognize that it has no console.
1022                  */
1023                 flags |= DETACHED_PROCESS;
1024         } else {
1025                 /* There is already a console. If we specified
1026                  * DETACHED_PROCESS here, too, Windows would
1027                  * disassociate the child from the console.
1028                  * The same is true for CREATE_NO_WINDOW.
1029                  * Go figure!
1030                  */
1031                 CloseHandle(cons);
1032         }
1033         memset(&si, 0, sizeof(si));
1034         si.cb = sizeof(si);
1035         si.dwFlags = STARTF_USESTDHANDLES;
1036         si.hStdInput = winansi_get_osfhandle(fhin);
1037         si.hStdOutput = winansi_get_osfhandle(fhout);
1038         si.hStdError = winansi_get_osfhandle(fherr);
1039
1040         if (xutftowcs_path(wcmd, cmd) < 0)
1041                 return -1;
1042         if (dir && xutftowcs_path(wdir, dir) < 0)
1043                 return -1;
1044
1045         /* concatenate argv, quoting args as we go */
1046         strbuf_init(&args, 0);
1047         if (prepend_cmd) {
1048                 char *quoted = (char *)quote_arg(cmd);
1049                 strbuf_addstr(&args, quoted);
1050                 if (quoted != cmd)
1051                         free(quoted);
1052         }
1053         for (; *argv; argv++) {
1054                 char *quoted = (char *)quote_arg(*argv);
1055                 if (*args.buf)
1056                         strbuf_addch(&args, ' ');
1057                 strbuf_addstr(&args, quoted);
1058                 if (quoted != *argv)
1059                         free(quoted);
1060         }
1061
1062         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1063         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1064         strbuf_release(&args);
1065
1066         wenvblk = make_environment_block(deltaenv);
1067
1068         memset(&pi, 0, sizeof(pi));
1069         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1070                 wenvblk, dir ? wdir : NULL, &si, &pi);
1071
1072         free(wenvblk);
1073         free(wargs);
1074
1075         if (!ret) {
1076                 errno = ENOENT;
1077                 return -1;
1078         }
1079         CloseHandle(pi.hThread);
1080
1081         /*
1082          * The process ID is the human-readable identifier of the process
1083          * that we want to present in log and error messages. The handle
1084          * is not useful for this purpose. But we cannot close it, either,
1085          * because it is not possible to turn a process ID into a process
1086          * handle after the process terminated.
1087          * Keep the handle in a list for waitpid.
1088          */
1089         EnterCriticalSection(&pinfo_cs);
1090         {
1091                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1092                 info->pid = pi.dwProcessId;
1093                 info->proc = pi.hProcess;
1094                 info->next = pinfo;
1095                 pinfo = info;
1096         }
1097         LeaveCriticalSection(&pinfo_cs);
1098
1099         return (pid_t)pi.dwProcessId;
1100 }
1101
1102 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1103 {
1104         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1105 }
1106
1107 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1108                      const char *dir,
1109                      int fhin, int fhout, int fherr)
1110 {
1111         pid_t pid;
1112         char **path = get_path_split();
1113         char *prog = path_lookup(cmd, path, 0);
1114
1115         if (!prog) {
1116                 errno = ENOENT;
1117                 pid = -1;
1118         }
1119         else {
1120                 const char *interpr = parse_interpreter(prog);
1121
1122                 if (interpr) {
1123                         const char *argv0 = argv[0];
1124                         char *iprog = path_lookup(interpr, path, 1);
1125                         argv[0] = prog;
1126                         if (!iprog) {
1127                                 errno = ENOENT;
1128                                 pid = -1;
1129                         }
1130                         else {
1131                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1132                                                        fhin, fhout, fherr);
1133                                 free(iprog);
1134                         }
1135                         argv[0] = argv0;
1136                 }
1137                 else
1138                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1139                                                fhin, fhout, fherr);
1140                 free(prog);
1141         }
1142         free_path_split(path);
1143         return pid;
1144 }
1145
1146 static int try_shell_exec(const char *cmd, char *const *argv)
1147 {
1148         const char *interpr = parse_interpreter(cmd);
1149         char **path;
1150         char *prog;
1151         int pid = 0;
1152
1153         if (!interpr)
1154                 return 0;
1155         path = get_path_split();
1156         prog = path_lookup(interpr, path, 1);
1157         if (prog) {
1158                 int argc = 0;
1159                 const char **argv2;
1160                 while (argv[argc]) argc++;
1161                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1162                 argv2[0] = (char *)cmd; /* full path to the script file */
1163                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1164                 pid = mingw_spawnv(prog, argv2, 1);
1165                 if (pid >= 0) {
1166                         int status;
1167                         if (waitpid(pid, &status, 0) < 0)
1168                                 status = 255;
1169                         exit(status);
1170                 }
1171                 pid = 1;        /* indicate that we tried but failed */
1172                 free(prog);
1173                 free(argv2);
1174         }
1175         free_path_split(path);
1176         return pid;
1177 }
1178
1179 int mingw_execv(const char *cmd, char *const *argv)
1180 {
1181         /* check if git_command is a shell script */
1182         if (!try_shell_exec(cmd, argv)) {
1183                 int pid, status;
1184
1185                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1186                 if (pid < 0)
1187                         return -1;
1188                 if (waitpid(pid, &status, 0) < 0)
1189                         status = 255;
1190                 exit(status);
1191         }
1192         return -1;
1193 }
1194
1195 int mingw_execvp(const char *cmd, char *const *argv)
1196 {
1197         char **path = get_path_split();
1198         char *prog = path_lookup(cmd, path, 0);
1199
1200         if (prog) {
1201                 mingw_execv(prog, argv);
1202                 free(prog);
1203         } else
1204                 errno = ENOENT;
1205
1206         free_path_split(path);
1207         return -1;
1208 }
1209
1210 int mingw_kill(pid_t pid, int sig)
1211 {
1212         if (pid > 0 && sig == SIGTERM) {
1213                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1214
1215                 if (TerminateProcess(h, -1)) {
1216                         CloseHandle(h);
1217                         return 0;
1218                 }
1219
1220                 errno = err_win_to_posix(GetLastError());
1221                 CloseHandle(h);
1222                 return -1;
1223         } else if (pid > 0 && sig == 0) {
1224                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1225                 if (h) {
1226                         CloseHandle(h);
1227                         return 0;
1228                 }
1229         }
1230
1231         errno = EINVAL;
1232         return -1;
1233 }
1234
1235 /*
1236  * Compare environment entries by key (i.e. stopping at '=' or '\0').
1237  */
1238 static int compareenv(const void *v1, const void *v2)
1239 {
1240         const char *e1 = *(const char**)v1;
1241         const char *e2 = *(const char**)v2;
1242
1243         for (;;) {
1244                 int c1 = *e1++;
1245                 int c2 = *e2++;
1246                 c1 = (c1 == '=') ? 0 : tolower(c1);
1247                 c2 = (c2 == '=') ? 0 : tolower(c2);
1248                 if (c1 > c2)
1249                         return 1;
1250                 if (c1 < c2)
1251                         return -1;
1252                 if (c1 == 0)
1253                         return 0;
1254         }
1255 }
1256
1257 static int bsearchenv(char **env, const char *name, size_t size)
1258 {
1259         unsigned low = 0, high = size;
1260         while (low < high) {
1261                 unsigned mid = low + ((high - low) >> 1);
1262                 int cmp = compareenv(&env[mid], &name);
1263                 if (cmp < 0)
1264                         low = mid + 1;
1265                 else if (cmp > 0)
1266                         high = mid;
1267                 else
1268                         return mid;
1269         }
1270         return ~low; /* not found, return 1's complement of insert position */
1271 }
1272
1273 /*
1274  * If name contains '=', then sets the variable, otherwise it unsets it
1275  * Size includes the terminating NULL. Env must have room for size + 1 entries
1276  * (in case of insert). Returns the new size. Optionally frees removed entries.
1277  */
1278 static int do_putenv(char **env, const char *name, int size, int free_old)
1279 {
1280         int i = bsearchenv(env, name, size - 1);
1281
1282         /* optionally free removed / replaced entry */
1283         if (i >= 0 && free_old)
1284                 free(env[i]);
1285
1286         if (strchr(name, '=')) {
1287                 /* if new value ('key=value') is specified, insert or replace entry */
1288                 if (i < 0) {
1289                         i = ~i;
1290                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1291                         size++;
1292                 }
1293                 env[i] = (char*) name;
1294         } else if (i >= 0) {
1295                 /* otherwise ('key') remove existing entry */
1296                 size--;
1297                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1298         }
1299         return size;
1300 }
1301
1302 char *mingw_getenv(const char *name)
1303 {
1304         char *value;
1305         int pos = bsearchenv(environ, name, environ_size - 1);
1306         if (pos < 0)
1307                 return NULL;
1308         value = strchr(environ[pos], '=');
1309         return value ? &value[1] : NULL;
1310 }
1311
1312 int mingw_putenv(const char *namevalue)
1313 {
1314         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1315         environ_size = do_putenv(environ, namevalue, environ_size, 1);
1316         return 0;
1317 }
1318
1319 /*
1320  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1321  * that service contains a numerical port, or that it is null. It
1322  * does a simple search using gethostbyname, and returns one IPv4 host
1323  * if one was found.
1324  */
1325 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1326                                    const struct addrinfo *hints,
1327                                    struct addrinfo **res)
1328 {
1329         struct hostent *h = NULL;
1330         struct addrinfo *ai;
1331         struct sockaddr_in *sin;
1332
1333         if (node) {
1334                 h = gethostbyname(node);
1335                 if (!h)
1336                         return WSAGetLastError();
1337         }
1338
1339         ai = xmalloc(sizeof(struct addrinfo));
1340         *res = ai;
1341         ai->ai_flags = 0;
1342         ai->ai_family = AF_INET;
1343         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1344         switch (ai->ai_socktype) {
1345         case SOCK_STREAM:
1346                 ai->ai_protocol = IPPROTO_TCP;
1347                 break;
1348         case SOCK_DGRAM:
1349                 ai->ai_protocol = IPPROTO_UDP;
1350                 break;
1351         default:
1352                 ai->ai_protocol = 0;
1353                 break;
1354         }
1355         ai->ai_addrlen = sizeof(struct sockaddr_in);
1356         if (hints && (hints->ai_flags & AI_CANONNAME))
1357                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1358         else
1359                 ai->ai_canonname = NULL;
1360
1361         sin = xcalloc(1, ai->ai_addrlen);
1362         sin->sin_family = AF_INET;
1363         /* Note: getaddrinfo is supposed to allow service to be a string,
1364          * which should be looked up using getservbyname. This is
1365          * currently not implemented */
1366         if (service)
1367                 sin->sin_port = htons(atoi(service));
1368         if (h)
1369                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1370         else if (hints && (hints->ai_flags & AI_PASSIVE))
1371                 sin->sin_addr.s_addr = INADDR_ANY;
1372         else
1373                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1374         ai->ai_addr = (struct sockaddr *)sin;
1375         ai->ai_next = NULL;
1376         return 0;
1377 }
1378
1379 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1380 {
1381         free(res->ai_canonname);
1382         free(res->ai_addr);
1383         free(res);
1384 }
1385
1386 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1387                                    char *host, DWORD hostlen,
1388                                    char *serv, DWORD servlen, int flags)
1389 {
1390         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1391         if (sa->sa_family != AF_INET)
1392                 return EAI_FAMILY;
1393         if (!host && !serv)
1394                 return EAI_NONAME;
1395
1396         if (host && hostlen > 0) {
1397                 struct hostent *ent = NULL;
1398                 if (!(flags & NI_NUMERICHOST))
1399                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1400                                             sizeof(sin->sin_addr), AF_INET);
1401
1402                 if (ent)
1403                         snprintf(host, hostlen, "%s", ent->h_name);
1404                 else if (flags & NI_NAMEREQD)
1405                         return EAI_NONAME;
1406                 else
1407                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1408         }
1409
1410         if (serv && servlen > 0) {
1411                 struct servent *ent = NULL;
1412                 if (!(flags & NI_NUMERICSERV))
1413                         ent = getservbyport(sin->sin_port,
1414                                             flags & NI_DGRAM ? "udp" : "tcp");
1415
1416                 if (ent)
1417                         snprintf(serv, servlen, "%s", ent->s_name);
1418                 else
1419                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1420         }
1421
1422         return 0;
1423 }
1424
1425 static HMODULE ipv6_dll = NULL;
1426 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1427 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1428                                       const struct addrinfo *hints,
1429                                       struct addrinfo **res);
1430 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1431                                       char *host, DWORD hostlen,
1432                                       char *serv, DWORD servlen, int flags);
1433 /*
1434  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1435  * don't need to try to load that one dynamically.
1436  */
1437
1438 static void socket_cleanup(void)
1439 {
1440         WSACleanup();
1441         if (ipv6_dll)
1442                 FreeLibrary(ipv6_dll);
1443         ipv6_dll = NULL;
1444         ipv6_freeaddrinfo = freeaddrinfo_stub;
1445         ipv6_getaddrinfo = getaddrinfo_stub;
1446         ipv6_getnameinfo = getnameinfo_stub;
1447 }
1448
1449 static void ensure_socket_initialization(void)
1450 {
1451         WSADATA wsa;
1452         static int initialized = 0;
1453         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1454         const char **name;
1455
1456         if (initialized)
1457                 return;
1458
1459         if (WSAStartup(MAKEWORD(2,2), &wsa))
1460                 die("unable to initialize winsock subsystem, error %d",
1461                         WSAGetLastError());
1462
1463         for (name = libraries; *name; name++) {
1464                 ipv6_dll = LoadLibrary(*name);
1465                 if (!ipv6_dll)
1466                         continue;
1467
1468                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1469                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1470                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1471                                                    const struct addrinfo *,
1472                                                    struct addrinfo **))
1473                         GetProcAddress(ipv6_dll, "getaddrinfo");
1474                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1475                                                    socklen_t, char *, DWORD,
1476                                                    char *, DWORD, int))
1477                         GetProcAddress(ipv6_dll, "getnameinfo");
1478                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1479                         FreeLibrary(ipv6_dll);
1480                         ipv6_dll = NULL;
1481                 } else
1482                         break;
1483         }
1484         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1485                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1486                 ipv6_getaddrinfo = getaddrinfo_stub;
1487                 ipv6_getnameinfo = getnameinfo_stub;
1488         }
1489
1490         atexit(socket_cleanup);
1491         initialized = 1;
1492 }
1493
1494 #undef gethostname
1495 int mingw_gethostname(char *name, int namelen)
1496 {
1497     ensure_socket_initialization();
1498     return gethostname(name, namelen);
1499 }
1500
1501 #undef gethostbyname
1502 struct hostent *mingw_gethostbyname(const char *host)
1503 {
1504         ensure_socket_initialization();
1505         return gethostbyname(host);
1506 }
1507
1508 void mingw_freeaddrinfo(struct addrinfo *res)
1509 {
1510         ipv6_freeaddrinfo(res);
1511 }
1512
1513 int mingw_getaddrinfo(const char *node, const char *service,
1514                       const struct addrinfo *hints, struct addrinfo **res)
1515 {
1516         ensure_socket_initialization();
1517         return ipv6_getaddrinfo(node, service, hints, res);
1518 }
1519
1520 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1521                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1522                       int flags)
1523 {
1524         ensure_socket_initialization();
1525         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1526 }
1527
1528 int mingw_socket(int domain, int type, int protocol)
1529 {
1530         int sockfd;
1531         SOCKET s;
1532
1533         ensure_socket_initialization();
1534         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1535         if (s == INVALID_SOCKET) {
1536                 /*
1537                  * WSAGetLastError() values are regular BSD error codes
1538                  * biased by WSABASEERR.
1539                  * However, strerror() does not know about networking
1540                  * specific errors, which are values beginning at 38 or so.
1541                  * Therefore, we choose to leave the biased error code
1542                  * in errno so that _if_ someone looks up the code somewhere,
1543                  * then it is at least the number that are usually listed.
1544                  */
1545                 errno = WSAGetLastError();
1546                 return -1;
1547         }
1548         /* convert into a file descriptor */
1549         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1550                 closesocket(s);
1551                 return error("unable to make a socket file descriptor: %s",
1552                         strerror(errno));
1553         }
1554         return sockfd;
1555 }
1556
1557 #undef connect
1558 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1559 {
1560         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1561         return connect(s, sa, sz);
1562 }
1563
1564 #undef bind
1565 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1566 {
1567         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1568         return bind(s, sa, sz);
1569 }
1570
1571 #undef setsockopt
1572 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1573 {
1574         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1575         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1576 }
1577
1578 #undef shutdown
1579 int mingw_shutdown(int sockfd, int how)
1580 {
1581         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1582         return shutdown(s, how);
1583 }
1584
1585 #undef listen
1586 int mingw_listen(int sockfd, int backlog)
1587 {
1588         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1589         return listen(s, backlog);
1590 }
1591
1592 #undef accept
1593 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1594 {
1595         int sockfd2;
1596
1597         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1598         SOCKET s2 = accept(s1, sa, sz);
1599
1600         /* convert into a file descriptor */
1601         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1602                 int err = errno;
1603                 closesocket(s2);
1604                 return error("unable to make a socket file descriptor: %s",
1605                         strerror(err));
1606         }
1607         return sockfd2;
1608 }
1609
1610 #undef rename
1611 int mingw_rename(const char *pold, const char *pnew)
1612 {
1613         DWORD attrs, gle;
1614         int tries = 0;
1615         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1616         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1617                 return -1;
1618
1619         /*
1620          * Try native rename() first to get errno right.
1621          * It is based on MoveFile(), which cannot overwrite existing files.
1622          */
1623         if (!_wrename(wpold, wpnew))
1624                 return 0;
1625         if (errno != EEXIST)
1626                 return -1;
1627 repeat:
1628         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1629                 return 0;
1630         /* TODO: translate more errors */
1631         gle = GetLastError();
1632         if (gle == ERROR_ACCESS_DENIED &&
1633             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1634                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1635                         errno = EISDIR;
1636                         return -1;
1637                 }
1638                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1639                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1640                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1641                                 return 0;
1642                         gle = GetLastError();
1643                         /* revert file attributes on failure */
1644                         SetFileAttributesW(wpnew, attrs);
1645                 }
1646         }
1647         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1648                 /*
1649                  * We assume that some other process had the source or
1650                  * destination file open at the wrong moment and retry.
1651                  * In order to give the other process a higher chance to
1652                  * complete its operation, we give up our time slice now.
1653                  * If we have to retry again, we do sleep a bit.
1654                  */
1655                 Sleep(delay[tries]);
1656                 tries++;
1657                 goto repeat;
1658         }
1659         if (gle == ERROR_ACCESS_DENIED &&
1660                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1661                        "Should I try again?", pold, pnew))
1662                 goto repeat;
1663
1664         errno = EACCES;
1665         return -1;
1666 }
1667
1668 /*
1669  * Note that this doesn't return the actual pagesize, but
1670  * the allocation granularity. If future Windows specific git code
1671  * needs the real getpagesize function, we need to find another solution.
1672  */
1673 int mingw_getpagesize(void)
1674 {
1675         SYSTEM_INFO si;
1676         GetSystemInfo(&si);
1677         return si.dwAllocationGranularity;
1678 }
1679
1680 struct passwd *getpwuid(int uid)
1681 {
1682         static char user_name[100];
1683         static struct passwd p;
1684
1685         DWORD len = sizeof(user_name);
1686         if (!GetUserName(user_name, &len))
1687                 return NULL;
1688         p.pw_name = user_name;
1689         p.pw_gecos = "unknown";
1690         p.pw_dir = NULL;
1691         return &p;
1692 }
1693
1694 static HANDLE timer_event;
1695 static HANDLE timer_thread;
1696 static int timer_interval;
1697 static int one_shot;
1698 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1699
1700 /* The timer works like this:
1701  * The thread, ticktack(), is a trivial routine that most of the time
1702  * only waits to receive the signal to terminate. The main thread tells
1703  * the thread to terminate by setting the timer_event to the signalled
1704  * state.
1705  * But ticktack() interrupts the wait state after the timer's interval
1706  * length to call the signal handler.
1707  */
1708
1709 static unsigned __stdcall ticktack(void *dummy)
1710 {
1711         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1712                 mingw_raise(SIGALRM);
1713                 if (one_shot)
1714                         break;
1715         }
1716         return 0;
1717 }
1718
1719 static int start_timer_thread(void)
1720 {
1721         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1722         if (timer_event) {
1723                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1724                 if (!timer_thread )
1725                         return errno = ENOMEM,
1726                                 error("cannot start timer thread");
1727         } else
1728                 return errno = ENOMEM,
1729                         error("cannot allocate resources for timer");
1730         return 0;
1731 }
1732
1733 static void stop_timer_thread(void)
1734 {
1735         if (timer_event)
1736                 SetEvent(timer_event);  /* tell thread to terminate */
1737         if (timer_thread) {
1738                 int rc = WaitForSingleObject(timer_thread, 1000);
1739                 if (rc == WAIT_TIMEOUT)
1740                         error("timer thread did not terminate timely");
1741                 else if (rc != WAIT_OBJECT_0)
1742                         error("waiting for timer thread failed: %lu",
1743                               GetLastError());
1744                 CloseHandle(timer_thread);
1745         }
1746         if (timer_event)
1747                 CloseHandle(timer_event);
1748         timer_event = NULL;
1749         timer_thread = NULL;
1750 }
1751
1752 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1753 {
1754         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1755 }
1756
1757 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1758 {
1759         static const struct timeval zero;
1760         static int atexit_done;
1761
1762         if (out != NULL)
1763                 return errno = EINVAL,
1764                         error("setitimer param 3 != NULL not implemented");
1765         if (!is_timeval_eq(&in->it_interval, &zero) &&
1766             !is_timeval_eq(&in->it_interval, &in->it_value))
1767                 return errno = EINVAL,
1768                         error("setitimer: it_interval must be zero or eq it_value");
1769
1770         if (timer_thread)
1771                 stop_timer_thread();
1772
1773         if (is_timeval_eq(&in->it_value, &zero) &&
1774             is_timeval_eq(&in->it_interval, &zero))
1775                 return 0;
1776
1777         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1778         one_shot = is_timeval_eq(&in->it_interval, &zero);
1779         if (!atexit_done) {
1780                 atexit(stop_timer_thread);
1781                 atexit_done = 1;
1782         }
1783         return start_timer_thread();
1784 }
1785
1786 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1787 {
1788         if (sig != SIGALRM)
1789                 return errno = EINVAL,
1790                         error("sigaction only implemented for SIGALRM");
1791         if (out != NULL)
1792                 return errno = EINVAL,
1793                         error("sigaction: param 3 != NULL not implemented");
1794
1795         timer_fn = in->sa_handler;
1796         return 0;
1797 }
1798
1799 #undef signal
1800 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1801 {
1802         sig_handler_t old;
1803
1804         switch (sig) {
1805         case SIGALRM:
1806                 old = timer_fn;
1807                 timer_fn = handler;
1808                 break;
1809
1810         case SIGINT:
1811                 old = sigint_fn;
1812                 sigint_fn = handler;
1813                 break;
1814
1815         default:
1816                 return signal(sig, handler);
1817         }
1818
1819         return old;
1820 }
1821
1822 #undef raise
1823 int mingw_raise(int sig)
1824 {
1825         switch (sig) {
1826         case SIGALRM:
1827                 if (timer_fn == SIG_DFL) {
1828                         if (isatty(STDERR_FILENO))
1829                                 fputs("Alarm clock\n", stderr);
1830                         exit(128 + SIGALRM);
1831                 } else if (timer_fn != SIG_IGN)
1832                         timer_fn(SIGALRM);
1833                 return 0;
1834
1835         case SIGINT:
1836                 if (sigint_fn == SIG_DFL)
1837                         exit(128 + SIGINT);
1838                 else if (sigint_fn != SIG_IGN)
1839                         sigint_fn(SIGINT);
1840                 return 0;
1841
1842         default:
1843                 return raise(sig);
1844         }
1845 }
1846
1847
1848 static const char *make_backslash_path(const char *path)
1849 {
1850         static char buf[PATH_MAX + 1];
1851         char *c;
1852
1853         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1854                 die("Too long path: %.*s", 60, path);
1855
1856         for (c = buf; *c; c++) {
1857                 if (*c == '/')
1858                         *c = '\\';
1859         }
1860         return buf;
1861 }
1862
1863 void mingw_open_html(const char *unixpath)
1864 {
1865         const char *htmlpath = make_backslash_path(unixpath);
1866         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1867                         const char *, const char *, const char *, INT);
1868         T ShellExecute;
1869         HMODULE shell32;
1870         int r;
1871
1872         shell32 = LoadLibrary("shell32.dll");
1873         if (!shell32)
1874                 die("cannot load shell32.dll");
1875         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1876         if (!ShellExecute)
1877                 die("cannot run browser");
1878
1879         printf("Launching default browser to display HTML ...\n");
1880         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1881         FreeLibrary(shell32);
1882         /* see the MSDN documentation referring to the result codes here */
1883         if (r <= 32) {
1884                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1885         }
1886 }
1887
1888 int link(const char *oldpath, const char *newpath)
1889 {
1890         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1891         static T create_hard_link = NULL;
1892         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1893         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1894                 xutftowcs_path(wnewpath, newpath) < 0)
1895                 return -1;
1896
1897         if (!create_hard_link) {
1898                 create_hard_link = (T) GetProcAddress(
1899                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1900                 if (!create_hard_link)
1901                         create_hard_link = (T)-1;
1902         }
1903         if (create_hard_link == (T)-1) {
1904                 errno = ENOSYS;
1905                 return -1;
1906         }
1907         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1908                 errno = err_win_to_posix(GetLastError());
1909                 return -1;
1910         }
1911         return 0;
1912 }
1913
1914 pid_t waitpid(pid_t pid, int *status, int options)
1915 {
1916         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1917             FALSE, pid);
1918         if (!h) {
1919                 errno = ECHILD;
1920                 return -1;
1921         }
1922
1923         if (pid > 0 && options & WNOHANG) {
1924                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1925                         CloseHandle(h);
1926                         return 0;
1927                 }
1928                 options &= ~WNOHANG;
1929         }
1930
1931         if (options == 0) {
1932                 struct pinfo_t **ppinfo;
1933                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1934                         CloseHandle(h);
1935                         return 0;
1936                 }
1937
1938                 if (status)
1939                         GetExitCodeProcess(h, (LPDWORD)status);
1940
1941                 EnterCriticalSection(&pinfo_cs);
1942
1943                 ppinfo = &pinfo;
1944                 while (*ppinfo) {
1945                         struct pinfo_t *info = *ppinfo;
1946                         if (info->pid == pid) {
1947                                 CloseHandle(info->proc);
1948                                 *ppinfo = info->next;
1949                                 free(info);
1950                                 break;
1951                         }
1952                         ppinfo = &info->next;
1953                 }
1954
1955                 LeaveCriticalSection(&pinfo_cs);
1956
1957                 CloseHandle(h);
1958                 return pid;
1959         }
1960         CloseHandle(h);
1961
1962         errno = EINVAL;
1963         return -1;
1964 }
1965
1966 int mingw_offset_1st_component(const char *path)
1967 {
1968         int offset = 0;
1969         if (has_dos_drive_prefix(path))
1970                 offset = 2;
1971
1972         /* unc paths */
1973         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1974
1975                 /* skip server name */
1976                 char *pos = strpbrk(path + 2, "\\/");
1977                 if (!pos)
1978                         return 0; /* Error: malformed unc path */
1979
1980                 do {
1981                         pos++;
1982                 } while (*pos && !is_dir_sep(*pos));
1983
1984                 offset = pos - path;
1985         }
1986
1987         return offset + is_dir_sep(path[offset]);
1988 }
1989
1990 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1991 {
1992         int upos = 0, wpos = 0;
1993         const unsigned char *utf = (const unsigned char*) utfs;
1994         if (!utf || !wcs || wcslen < 1) {
1995                 errno = EINVAL;
1996                 return -1;
1997         }
1998         /* reserve space for \0 */
1999         wcslen--;
2000         if (utflen < 0)
2001                 utflen = INT_MAX;
2002
2003         while (upos < utflen) {
2004                 int c = utf[upos++] & 0xff;
2005                 if (utflen == INT_MAX && c == 0)
2006                         break;
2007
2008                 if (wpos >= wcslen) {
2009                         wcs[wpos] = 0;
2010                         errno = ERANGE;
2011                         return -1;
2012                 }
2013
2014                 if (c < 0x80) {
2015                         /* ASCII */
2016                         wcs[wpos++] = c;
2017                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2018                                 (utf[upos] & 0xc0) == 0x80) {
2019                         /* 2-byte utf-8 */
2020                         c = ((c & 0x1f) << 6);
2021                         c |= (utf[upos++] & 0x3f);
2022                         wcs[wpos++] = c;
2023                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2024                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2025                                 (utf[upos] & 0xc0) == 0x80 &&
2026                                 (utf[upos + 1] & 0xc0) == 0x80) {
2027                         /* 3-byte utf-8 */
2028                         c = ((c & 0x0f) << 12);
2029                         c |= ((utf[upos++] & 0x3f) << 6);
2030                         c |= (utf[upos++] & 0x3f);
2031                         wcs[wpos++] = c;
2032                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2033                                 wpos + 1 < wcslen &&
2034                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2035                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2036                                 (utf[upos] & 0xc0) == 0x80 &&
2037                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2038                                 (utf[upos + 2] & 0xc0) == 0x80) {
2039                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2040                         c = ((c & 0x07) << 18);
2041                         c |= ((utf[upos++] & 0x3f) << 12);
2042                         c |= ((utf[upos++] & 0x3f) << 6);
2043                         c |= (utf[upos++] & 0x3f);
2044                         c -= 0x10000;
2045                         wcs[wpos++] = 0xd800 | (c >> 10);
2046                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2047                 } else if (c >= 0xa0) {
2048                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2049                         wcs[wpos++] = c;
2050                 } else {
2051                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2052                         static const char *hex = "0123456789abcdef";
2053                         wcs[wpos++] = hex[c >> 4];
2054                         if (wpos < wcslen)
2055                                 wcs[wpos++] = hex[c & 0x0f];
2056                 }
2057         }
2058         wcs[wpos] = 0;
2059         return wpos;
2060 }
2061
2062 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2063 {
2064         if (!wcs || !utf || utflen < 1) {
2065                 errno = EINVAL;
2066                 return -1;
2067         }
2068         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2069         if (utflen)
2070                 return utflen - 1;
2071         errno = ERANGE;
2072         return -1;
2073 }
2074
2075 /*
2076  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2077  * mingw startup code, see init.c in mingw runtime).
2078  */
2079 int _CRT_glob = 0;
2080
2081 typedef struct {
2082         int newmode;
2083 } _startupinfo;
2084
2085 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2086                 _startupinfo *si);
2087
2088 static NORETURN void die_startup()
2089 {
2090         fputs("fatal: not enough memory for initialization", stderr);
2091         exit(128);
2092 }
2093
2094 static void *malloc_startup(size_t size)
2095 {
2096         void *result = malloc(size);
2097         if (!result)
2098                 die_startup();
2099         return result;
2100 }
2101
2102 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2103 {
2104         len = xwcstoutf(buffer, wcs, len) + 1;
2105         return memcpy(malloc_startup(len), buffer, len);
2106 }
2107
2108 void mingw_startup()
2109 {
2110         int i, maxlen, argc;
2111         char *buffer;
2112         wchar_t **wenv, **wargv;
2113         _startupinfo si;
2114
2115         /* get wide char arguments and environment */
2116         si.newmode = 0;
2117         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2118                 die_startup();
2119
2120         /* determine size of argv and environ conversion buffer */
2121         maxlen = wcslen(_wpgmptr);
2122         for (i = 1; i < argc; i++)
2123                 maxlen = max(maxlen, wcslen(wargv[i]));
2124         for (i = 0; wenv[i]; i++)
2125                 maxlen = max(maxlen, wcslen(wenv[i]));
2126
2127         /*
2128          * nedmalloc can't free CRT memory, allocate resizable environment
2129          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2130          * use it while initializing the environment itself.
2131          */
2132         environ_size = i + 1;
2133         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2134         environ = malloc_startup(environ_alloc);
2135
2136         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2137         maxlen = 3 * maxlen + 1;
2138         buffer = malloc_startup(maxlen);
2139
2140         /* convert command line arguments and environment to UTF-8 */
2141         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2142         for (i = 1; i < argc; i++)
2143                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2144         for (i = 0; wenv[i]; i++)
2145                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2146         environ[i] = NULL;
2147         free(buffer);
2148
2149         /* sort environment for O(log n) getenv / putenv */
2150         qsort(environ, i, sizeof(char*), compareenv);
2151
2152         /* fix Windows specific environment settings */
2153
2154         /* on Windows it is TMP and TEMP */
2155         if (!mingw_getenv("TMPDIR")) {
2156                 const char *tmp = mingw_getenv("TMP");
2157                 if (!tmp)
2158                         tmp = mingw_getenv("TEMP");
2159                 if (tmp)
2160                         setenv("TMPDIR", tmp, 1);
2161         }
2162
2163         /* simulate TERM to enable auto-color (see color.c) */
2164         if (!getenv("TERM"))
2165                 setenv("TERM", "cygwin", 1);
2166
2167         /* initialize critical section for waitpid pinfo_t list */
2168         InitializeCriticalSection(&pinfo_cs);
2169
2170         /* set up default file mode and file modes for stdin/out/err */
2171         _fmode = _O_BINARY;
2172         _setmode(_fileno(stdin), _O_BINARY);
2173         _setmode(_fileno(stdout), _O_BINARY);
2174         _setmode(_fileno(stderr), _O_BINARY);
2175
2176         /* initialize Unicode console */
2177         winansi_init();
2178 }