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                         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 #undef write
 367 ssize_t mingw_write(int fd, const void *buf, size_t count)
 368 {
 369         /*
 370          * While write() calls to a file on a local disk are translated
 371          * into WriteFile() calls with a maximum size of 64KB on Windows
 372          * XP and 256KB on Vista, no such cap is placed on writes to
 373          * files over the network on Windows XP.  Unfortunately, there
 374          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 375          * bigger writes fail on Windows XP.
 376          * So we cap to a nice 31MB here to avoid write failures over
 377          * the net without changing the number of WriteFile() calls in
 378          * the local case.
 379          */
 380         return write(fd, buf, min(count, 31 * 1024 * 1024));
 381 }
 382
 383 static BOOL WINAPI ctrl_ignore(DWORD type)
 384 {
 385         return TRUE;
 386 }
 387
 388 #undef fgetc
 389 int mingw_fgetc(FILE *stream)
 390 {
 391         int ch;
 392         if (!isatty(_fileno(stream)))
 393                 return fgetc(stream);
 394
 395         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 396         while (1) {
 397                 ch = fgetc(stream);
 398                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 399                         break;
 400
 401                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 402                 mingw_raise(SIGINT);
 403         }
 404         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 405         return ch;
 406 }
 407
 408 #undef fopen
 409 FILE *mingw_fopen (const char *filename, const char *otype)
 410 {
 411         int hide = 0;
 412         FILE *file;
 413         wchar_t wfilename[MAX_PATH], wotype[4];
 414         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 415             basename((char*)filename)[0] == '.')
 416                 hide = access(filename, F_OK);
 417         if (filename && !strcmp(filename, "/dev/null"))
 418                 filename = "nul";
 419         if (xutftowcs_path(wfilename, filename) < 0 ||
 420                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 421                 return NULL;
 422         file = _wfopen(wfilename, wotype);
 423         if (file && hide && make_hidden(wfilename))
 424                 warning("Could not mark '%s' as hidden.", filename);
 425         return file;
 426 }
 427
 428 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 429 {
 430         int hide = 0;
 431         FILE *file;
 432         wchar_t wfilename[MAX_PATH], wotype[4];
 433         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 434             basename((char*)filename)[0] == '.')
 435                 hide = access(filename, F_OK);
 436         if (filename && !strcmp(filename, "/dev/null"))
 437                 filename = "nul";
 438         if (xutftowcs_path(wfilename, filename) < 0 ||
 439                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 440                 return NULL;
 441         file = _wfreopen(wfilename, wotype, stream);
 442         if (file && hide && make_hidden(wfilename))
 443                 warning("Could not mark '%s' as hidden.", filename);
 444         return file;
 445 }
 446
 447 #undef fflush
 448 int mingw_fflush(FILE *stream)
 449 {
 450         int ret = fflush(stream);
 451
 452         /*
 453          * write() is used behind the scenes of stdio output functions.
 454          * Since git code does not check for errors after each stdio write
 455          * operation, it can happen that write() is called by a later
 456          * stdio function even if an earlier write() call failed. In the
 457          * case of a pipe whose readable end was closed, only the first
 458          * call to write() reports EPIPE on Windows. Subsequent write()
 459          * calls report EINVAL. It is impossible to notice whether this
 460          * fflush invocation triggered such a case, therefore, we have to
 461          * catch all EINVAL errors whole-sale.
 462          */
 463         if (ret && errno == EINVAL)
 464                 errno = EPIPE;
 465
 466         return ret;
 467 }
 468
 469 int mingw_access(const char *filename, int mode)
 470 {
 471         wchar_t wfilename[MAX_PATH];
 472         if (xutftowcs_path(wfilename, filename) < 0)
 473                 return -1;
 474         /* X_OK is not supported by the MSVCRT version */
 475         return _waccess(wfilename, mode & ~X_OK);
 476 }
 477
 478 int mingw_chdir(const char *dirname)
 479 {
 480         wchar_t wdirname[MAX_PATH];
 481         if (xutftowcs_path(wdirname, dirname) < 0)
 482                 return -1;
 483         return _wchdir(wdirname);
 484 }
 485
 486 int mingw_chmod(const char *filename, int mode)
 487 {
 488         wchar_t wfilename[MAX_PATH];
 489         if (xutftowcs_path(wfilename, filename) < 0)
 490                 return -1;
 491         return _wchmod(wfilename, mode);
 492 }
 493
 494 /*
 495  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 496  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 497  */
 498 static inline long long filetime_to_hnsec(const FILETIME *ft)
 499 {
 500         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 501         /* Windows to Unix Epoch conversion */
 502         return winTime - 116444736000000000LL;
 503 }
 504
 505 static inline time_t filetime_to_time_t(const FILETIME *ft)
 506 {
 507         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 508 }
 509
 510 /* We keep the do_lstat code in a separate function to avoid recursion.
 511  * When a path ends with a slash, the stat will fail with ENOENT. In
 512  * this case, we strip the trailing slashes and stat again.
 513  *
 514  * If follow is true then act like stat() and report on the link
 515  * target. Otherwise report on the link itself.
 516  */
 517 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 518 {
 519         WIN32_FILE_ATTRIBUTE_DATA fdata;
 520         wchar_t wfilename[MAX_PATH];
 521         if (xutftowcs_path(wfilename, file_name) < 0)
 522                 return -1;
 523
 524         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 525                 buf->st_ino = 0;
 526                 buf->st_gid = 0;
 527                 buf->st_uid = 0;
 528                 buf->st_nlink = 1;
 529                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 530                 buf->st_size = fdata.nFileSizeLow |
 531                         (((off_t)fdata.nFileSizeHigh)<<32);
 532                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 533                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 534                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 535                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 536                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 537                         WIN32_FIND_DATAW findbuf;
 538                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 539                         if (handle != INVALID_HANDLE_VALUE) {
 540                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 541                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 542                                         if (follow) {
 543                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 544                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 545                                         } else {
 546                                                 buf->st_mode = S_IFLNK;
 547                                         }
 548                                         buf->st_mode |= S_IREAD;
 549                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 550                                                 buf->st_mode |= S_IWRITE;
 551                                 }
 552                                 FindClose(handle);
 553                         }
 554                 }
 555                 return 0;
 556         }
 557         switch (GetLastError()) {
 558         case ERROR_ACCESS_DENIED:
 559         case ERROR_SHARING_VIOLATION:
 560         case ERROR_LOCK_VIOLATION:
 561         case ERROR_SHARING_BUFFER_EXCEEDED:
 562                 errno = EACCES;
 563                 break;
 564         case ERROR_BUFFER_OVERFLOW:
 565                 errno = ENAMETOOLONG;
 566                 break;
 567         case ERROR_NOT_ENOUGH_MEMORY:
 568                 errno = ENOMEM;
 569                 break;
 570         default:
 571                 errno = ENOENT;
 572                 break;
 573         }
 574         return -1;
 575 }
 576
 577 /* We provide our own lstat/fstat functions, since the provided
 578  * lstat/fstat functions are so slow. These stat functions are
 579  * tailored for Git's usage (read: fast), and are not meant to be
 580  * complete. Note that Git stat()s are redirected to mingw_lstat()
 581  * too, since Windows doesn't really handle symlinks that well.
 582  */
 583 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 584 {
 585         int namelen;
 586         char alt_name[PATH_MAX];
 587
 588         if (!do_lstat(follow, file_name, buf))
 589                 return 0;
 590
 591         /* if file_name ended in a '/', Windows returned ENOENT;
 592          * try again without trailing slashes
 593          */
 594         if (errno != ENOENT)
 595                 return -1;
 596
 597         namelen = strlen(file_name);
 598         if (namelen && file_name[namelen-1] != '/')
 599                 return -1;
 600         while (namelen && file_name[namelen-1] == '/')
 601                 --namelen;
 602         if (!namelen || namelen >= PATH_MAX)
 603                 return -1;
 604
 605         memcpy(alt_name, file_name, namelen);
 606         alt_name[namelen] = 0;
 607         return do_lstat(follow, alt_name, buf);
 608 }
 609
 610 int mingw_lstat(const char *file_name, struct stat *buf)
 611 {
 612         return do_stat_internal(0, file_name, buf);
 613 }
 614 int mingw_stat(const char *file_name, struct stat *buf)
 615 {
 616         return do_stat_internal(1, file_name, buf);
 617 }
 618
 619 int mingw_fstat(int fd, struct stat *buf)
 620 {
 621         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 622         BY_HANDLE_FILE_INFORMATION fdata;
 623
 624         if (fh == INVALID_HANDLE_VALUE) {
 625                 errno = EBADF;
 626                 return -1;
 627         }
 628         /* direct non-file handles to MS's fstat() */
 629         if (GetFileType(fh) != FILE_TYPE_DISK)
 630                 return _fstati64(fd, buf);
 631
 632         if (GetFileInformationByHandle(fh, &fdata)) {
 633                 buf->st_ino = 0;
 634                 buf->st_gid = 0;
 635                 buf->st_uid = 0;
 636                 buf->st_nlink = 1;
 637                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 638                 buf->st_size = fdata.nFileSizeLow |
 639                         (((off_t)fdata.nFileSizeHigh)<<32);
 640                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 641                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 642                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 643                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 644                 return 0;
 645         }
 646         errno = EBADF;
 647         return -1;
 648 }
 649
 650 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 651 {
 652         long long winTime = t * 10000000LL + 116444736000000000LL;
 653         ft->dwLowDateTime = winTime;
 654         ft->dwHighDateTime = winTime >> 32;
 655 }
 656
 657 int mingw_utime (const char *file_name, const struct utimbuf *times)
 658 {
 659         FILETIME mft, aft;
 660         int fh, rc;
 661         DWORD attrs;
 662         wchar_t wfilename[MAX_PATH];
 663         if (xutftowcs_path(wfilename, file_name) < 0)
 664                 return -1;
 665
 666         /* must have write permission */
 667         attrs = GetFileAttributesW(wfilename);
 668         if (attrs != INVALID_FILE_ATTRIBUTES &&
 669             (attrs & FILE_ATTRIBUTE_READONLY)) {
 670                 /* ignore errors here; open() will report them */
 671                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 672         }
 673
 674         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 675                 rc = -1;
 676                 goto revert_attrs;
 677         }
 678
 679         if (times) {
 680                 time_t_to_filetime(times->modtime, &mft);
 681                 time_t_to_filetime(times->actime, &aft);
 682         } else {
 683                 GetSystemTimeAsFileTime(&mft);
 684                 aft = mft;
 685         }
 686         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 687                 errno = EINVAL;
 688                 rc = -1;
 689         } else
 690                 rc = 0;
 691         close(fh);
 692
 693 revert_attrs:
 694         if (attrs != INVALID_FILE_ATTRIBUTES &&
 695             (attrs & FILE_ATTRIBUTE_READONLY)) {
 696                 /* ignore errors again */
 697                 SetFileAttributesW(wfilename, attrs);
 698         }
 699         return rc;
 700 }
 701
 702 unsigned int sleep (unsigned int seconds)
 703 {
 704         Sleep(seconds*1000);
 705         return 0;
 706 }
 707
 708 char *mingw_mktemp(char *template)
 709 {
 710         wchar_t wtemplate[MAX_PATH];
 711         if (xutftowcs_path(wtemplate, template) < 0)
 712                 return NULL;
 713         if (!_wmktemp(wtemplate))
 714                 return NULL;
 715         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 716                 return NULL;
 717         return template;
 718 }
 719
 720 int mkstemp(char *template)
 721 {
 722         char *filename = mktemp(template);
 723         if (filename == NULL)
 724                 return -1;
 725         return open(filename, O_RDWR | O_CREAT, 0600);
 726 }
 727
 728 int gettimeofday(struct timeval *tv, void *tz)
 729 {
 730         FILETIME ft;
 731         long long hnsec;
 732
 733         GetSystemTimeAsFileTime(&ft);
 734         hnsec = filetime_to_hnsec(&ft);
 735         tv->tv_sec = hnsec / 10000000;
 736         tv->tv_usec = (hnsec % 10000000) / 10;
 737         return 0;
 738 }
 739
 740 int pipe(int filedes[2])
 741 {
 742         HANDLE h[2];
 743
 744         /* this creates non-inheritable handles */
 745         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 746                 errno = err_win_to_posix(GetLastError());
 747                 return -1;
 748         }
 749         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 750         if (filedes[0] < 0) {
 751                 CloseHandle(h[0]);
 752                 CloseHandle(h[1]);
 753                 return -1;
 754         }
 755         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 756         if (filedes[0] < 0) {
 757                 close(filedes[0]);
 758                 CloseHandle(h[1]);
 759                 return -1;
 760         }
 761         return 0;
 762 }
 763
 764 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 765 {
 766         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 767         memcpy(result, gmtime(timep), sizeof(struct tm));
 768         return result;
 769 }
 770
 771 struct tm *localtime_r(const time_t *timep, struct tm *result)
 772 {
 773         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 774         memcpy(result, localtime(timep), sizeof(struct tm));
 775         return result;
 776 }
 777
 778 char *mingw_getcwd(char *pointer, int len)
 779 {
 780         int i;
 781         wchar_t wpointer[MAX_PATH];
 782         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 783                 return NULL;
 784         if (xwcstoutf(pointer, wpointer, len) < 0)
 785                 return NULL;
 786         for (i = 0; pointer[i]; i++)
 787                 if (pointer[i] == '\\')
 788                         pointer[i] = '/';
 789         return pointer;
 790 }
 791
 792 /*
 793  * Compare environment entries by key (i.e. stopping at '=' or '\0').
 794  */
 795 static int compareenv(const void *v1, const void *v2)
 796 {
 797         const char *e1 = *(const char**)v1;
 798         const char *e2 = *(const char**)v2;
 799
 800         for (;;) {
 801                 int c1 = *e1++;
 802                 int c2 = *e2++;
 803                 c1 = (c1 == '=') ? 0 : tolower(c1);
 804                 c2 = (c2 == '=') ? 0 : tolower(c2);
 805                 if (c1 > c2)
 806                         return 1;
 807                 if (c1 < c2)
 808                         return -1;
 809                 if (c1 == 0)
 810                         return 0;
 811         }
 812 }
 813
 814 static int bsearchenv(char **env, const char *name, size_t size)
 815 {
 816         unsigned low = 0, high = size;
 817         while (low < high) {
 818                 unsigned mid = low + ((high - low) >> 1);
 819                 int cmp = compareenv(&env[mid], &name);
 820                 if (cmp < 0)
 821                         low = mid + 1;
 822                 else if (cmp > 0)
 823                         high = mid;
 824                 else
 825                         return mid;
 826         }
 827         return ~low; /* not found, return 1's complement of insert position */
 828 }
 829
 830 /*
 831  * If name contains '=', then sets the variable, otherwise it unsets it
 832  * Size includes the terminating NULL. Env must have room for size + 1 entries
 833  * (in case of insert). Returns the new size. Optionally frees removed entries.
 834  */
 835 static int do_putenv(char **env, const char *name, int size, int free_old)
 836 {
 837         int i = bsearchenv(env, name, size - 1);
 838
 839         /* optionally free removed / replaced entry */
 840         if (i >= 0 && free_old)
 841                 free(env[i]);
 842
 843         if (strchr(name, '=')) {
 844                 /* if new value ('key=value') is specified, insert or replace entry */
 845                 if (i < 0) {
 846                         i = ~i;
 847                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
 848                         size++;
 849                 }
 850                 env[i] = (char*) name;
 851         } else if (i >= 0) {
 852                 /* otherwise ('key') remove existing entry */
 853                 size--;
 854                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
 855         }
 856         return size;
 857 }
 858
 859 /* used number of elements of environ array, including terminating NULL */
 860 static int environ_size = 0;
 861 /* allocated size of environ array, in bytes */
 862 static int environ_alloc = 0;
 863
 864 char *mingw_getenv(const char *name)
 865 {
 866         char *value;
 867         int pos = bsearchenv(environ, name, environ_size - 1);
 868         if (pos < 0)
 869                 return NULL;
 870         value = strchr(environ[pos], '=');
 871         return value ? &value[1] : NULL;
 872 }
 873
 874 int mingw_putenv(const char *namevalue)
 875 {
 876         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
 877         environ_size = do_putenv(environ, namevalue, environ_size, 1);
 878         return 0;
 879 }
 880
 881 /*
 882  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 883  * (Parsing C++ Command-Line Arguments)
 884  */
 885 static const char *quote_arg(const char *arg)
 886 {
 887         /* count chars to quote */
 888         int len = 0, n = 0;
 889         int force_quotes = 0;
 890         char *q, *d;
 891         const char *p = arg;
 892         if (!*p) force_quotes = 1;
 893         while (*p) {
 894                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 895                         force_quotes = 1;
 896                 else if (*p == '"')
 897                         n++;
 898                 else if (*p == '\\') {
 899                         int count = 0;
 900                         while (*p == '\\') {
 901                                 count++;
 902                                 p++;
 903                                 len++;
 904                         }
 905                         if (*p == '"')
 906                                 n += count*2 + 1;
 907                         continue;
 908                 }
 909                 len++;
 910                 p++;
 911         }
 912         if (!force_quotes && n == 0)
 913                 return arg;
 914
 915         /* insert \ where necessary */
 916         d = q = xmalloc(len+n+3);
 917         *d++ = '"';
 918         while (*arg) {
 919                 if (*arg == '"')
 920                         *d++ = '\\';
 921                 else if (*arg == '\\') {
 922                         int count = 0;
 923                         while (*arg == '\\') {
 924                                 count++;
 925                                 *d++ = *arg++;
 926                         }
 927                         if (*arg == '"') {
 928                                 while (count-- > 0)
 929                                         *d++ = '\\';
 930                                 *d++ = '\\';
 931                         }
 932                 }
 933                 *d++ = *arg++;
 934         }
 935         *d++ = '"';
 936         *d++ = 0;
 937         return q;
 938 }
 939
 940 static const char *parse_interpreter(const char *cmd)
 941 {
 942         static char buf[100];
 943         char *p, *opt;
 944         int n, fd;
 945
 946         /* don't even try a .exe */
 947         n = strlen(cmd);
 948         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 949                 return NULL;
 950
 951         fd = open(cmd, O_RDONLY);
 952         if (fd < 0)
 953                 return NULL;
 954         n = read(fd, buf, sizeof(buf)-1);
 955         close(fd);
 956         if (n < 4)      /* at least '#!/x' and not error */
 957                 return NULL;
 958
 959         if (buf[0] != '#' || buf[1] != '!')
 960                 return NULL;
 961         buf[n] = '\0';
 962         p = buf + strcspn(buf, "\r\n");
 963         if (!*p)
 964                 return NULL;
 965
 966         *p = '\0';
 967         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 968                 return NULL;
 969         /* strip options */
 970         if ((opt = strchr(p+1, ' ')))
 971                 *opt = '\0';
 972         return p+1;
 973 }
 974
 975 /*
 976  * Splits the PATH into parts.
 977  */
 978 static char **get_path_split(void)
 979 {
 980         char *p, **path, *envpath = getenv("PATH");
 981         int i, n = 0;
 982
 983         if (!envpath || !*envpath)
 984                 return NULL;
 985
 986         envpath = xstrdup(envpath);
 987         p = envpath;
 988         while (p) {
 989                 char *dir = p;
 990                 p = strchr(p, ';');
 991                 if (p) *p++ = '\0';
 992                 if (*dir) {     /* not earlier, catches series of ; */
 993                         ++n;
 994                 }
 995         }
 996         if (!n)
 997                 return NULL;
 998
 999         path = xmalloc((n+1)*sizeof(char *));
1000         p = envpath;
1001         i = 0;
1002         do {
1003                 if (*p)
1004                         path[i++] = xstrdup(p);
1005                 p = p+strlen(p)+1;
1006         } while (i < n);
1007         path[i] = NULL;
1008
1009         free(envpath);
1010
1011         return path;
1012 }
1013
1014 static void free_path_split(char **path)
1015 {
1016         char **p = path;
1017
1018         if (!path)
1019                 return;
1020
1021         while (*p)
1022                 free(*p++);
1023         free(path);
1024 }
1025
1026 /*
1027  * exe_only means that we only want to detect .exe files, but not scripts
1028  * (which do not have an extension)
1029  */
1030 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
1031 {
1032         char path[MAX_PATH];
1033         wchar_t wpath[MAX_PATH];
1034         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
1035
1036         if (xutftowcs_path(wpath, path) < 0)
1037                 return NULL;
1038
1039         if (!isexe && _waccess(wpath, F_OK) == 0)
1040                 return xstrdup(path);
1041         wpath[wcslen(wpath)-4] = '\0';
1042         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
1043                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
1044                         path[strlen(path)-4] = '\0';
1045                         return xstrdup(path);
1046                 }
1047         }
1048         return NULL;
1049 }
1050
1051 /*
1052  * Determines the absolute path of cmd using the split path in path.
1053  * If cmd contains a slash or backslash, no lookup is performed.
1054  */
1055 static char *path_lookup(const char *cmd, char **path, int exe_only)
1056 {
1057         char *prog = NULL;
1058         int len = strlen(cmd);
1059         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1060
1061         if (strchr(cmd, '/') || strchr(cmd, '\\'))
1062                 prog = xstrdup(cmd);
1063
1064         while (!prog && *path)
1065                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
1066
1067         return prog;
1068 }
1069
1070 /*
1071  * Create environment block suitable for CreateProcess. Merges current
1072  * process environment and the supplied environment changes.
1073  */
1074 static wchar_t *make_environment_block(char **deltaenv)
1075 {
1076         wchar_t *wenvblk = NULL;
1077         char **tmpenv;
1078         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1079
1080         while (deltaenv && deltaenv[i])
1081                 i++;
1082
1083         /* copy the environment, leaving space for changes */
1084         tmpenv = xmalloc((size + i) * sizeof(char*));
1085         memcpy(tmpenv, environ, size * sizeof(char*));
1086
1087         /* merge supplied environment changes into the temporary environment */
1088         for (i = 0; deltaenv && deltaenv[i]; i++)
1089                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1090
1091         /* create environment block from temporary environment */
1092         for (i = 0; tmpenv[i]; i++) {
1093                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1094                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1095                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1096         }
1097         /* add final \0 terminator */
1098         wenvblk[wenvpos] = 0;
1099         free(tmpenv);
1100         return wenvblk;
1101 }
1102
1103 struct pinfo_t {
1104         struct pinfo_t *next;
1105         pid_t pid;
1106         HANDLE proc;
1107 };
1108 static struct pinfo_t *pinfo = NULL;
1109 CRITICAL_SECTION pinfo_cs;
1110
1111 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1112                               const char *dir,
1113                               int prepend_cmd, int fhin, int fhout, int fherr)
1114 {
1115         STARTUPINFOW si;
1116         PROCESS_INFORMATION pi;
1117         struct strbuf args;
1118         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1119         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1120         BOOL ret;
1121
1122         /* Determine whether or not we are associated to a console */
1123         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1124                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1125                         FILE_ATTRIBUTE_NORMAL, NULL);
1126         if (cons == INVALID_HANDLE_VALUE) {
1127                 /* There is no console associated with this process.
1128                  * Since the child is a console process, Windows
1129                  * would normally create a console window. But
1130                  * since we'll be redirecting std streams, we do
1131                  * not need the console.
1132                  * It is necessary to use DETACHED_PROCESS
1133                  * instead of CREATE_NO_WINDOW to make ssh
1134                  * recognize that it has no console.
1135                  */
1136                 flags |= DETACHED_PROCESS;
1137         } else {
1138                 /* There is already a console. If we specified
1139                  * DETACHED_PROCESS here, too, Windows would
1140                  * disassociate the child from the console.
1141                  * The same is true for CREATE_NO_WINDOW.
1142                  * Go figure!
1143                  */
1144                 CloseHandle(cons);
1145         }
1146         memset(&si, 0, sizeof(si));
1147         si.cb = sizeof(si);
1148         si.dwFlags = STARTF_USESTDHANDLES;
1149         si.hStdInput = winansi_get_osfhandle(fhin);
1150         si.hStdOutput = winansi_get_osfhandle(fhout);
1151         si.hStdError = winansi_get_osfhandle(fherr);
1152
1153         if (xutftowcs_path(wcmd, cmd) < 0)
1154                 return -1;
1155         if (dir && xutftowcs_path(wdir, dir) < 0)
1156                 return -1;
1157
1158         /* concatenate argv, quoting args as we go */
1159         strbuf_init(&args, 0);
1160         if (prepend_cmd) {
1161                 char *quoted = (char *)quote_arg(cmd);
1162                 strbuf_addstr(&args, quoted);
1163                 if (quoted != cmd)
1164                         free(quoted);
1165         }
1166         for (; *argv; argv++) {
1167                 char *quoted = (char *)quote_arg(*argv);
1168                 if (*args.buf)
1169                         strbuf_addch(&args, ' ');
1170                 strbuf_addstr(&args, quoted);
1171                 if (quoted != *argv)
1172                         free(quoted);
1173         }
1174
1175         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1176         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1177         strbuf_release(&args);
1178
1179         wenvblk = make_environment_block(deltaenv);
1180
1181         memset(&pi, 0, sizeof(pi));
1182         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1183                 wenvblk, dir ? wdir : NULL, &si, &pi);
1184
1185         free(wenvblk);
1186         free(wargs);
1187
1188         if (!ret) {
1189                 errno = ENOENT;
1190                 return -1;
1191         }
1192         CloseHandle(pi.hThread);
1193
1194         /*
1195          * The process ID is the human-readable identifier of the process
1196          * that we want to present in log and error messages. The handle
1197          * is not useful for this purpose. But we cannot close it, either,
1198          * because it is not possible to turn a process ID into a process
1199          * handle after the process terminated.
1200          * Keep the handle in a list for waitpid.
1201          */
1202         EnterCriticalSection(&pinfo_cs);
1203         {
1204                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1205                 info->pid = pi.dwProcessId;
1206                 info->proc = pi.hProcess;
1207                 info->next = pinfo;
1208                 pinfo = info;
1209         }
1210         LeaveCriticalSection(&pinfo_cs);
1211
1212         return (pid_t)pi.dwProcessId;
1213 }
1214
1215 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1216 {
1217         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1218 }
1219
1220 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1221                      const char *dir,
1222                      int fhin, int fhout, int fherr)
1223 {
1224         pid_t pid;
1225         char **path = get_path_split();
1226         char *prog = path_lookup(cmd, path, 0);
1227
1228         if (!prog) {
1229                 errno = ENOENT;
1230                 pid = -1;
1231         }
1232         else {
1233                 const char *interpr = parse_interpreter(prog);
1234
1235                 if (interpr) {
1236                         const char *argv0 = argv[0];
1237                         char *iprog = path_lookup(interpr, path, 1);
1238                         argv[0] = prog;
1239                         if (!iprog) {
1240                                 errno = ENOENT;
1241                                 pid = -1;
1242                         }
1243                         else {
1244                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1245                                                        fhin, fhout, fherr);
1246                                 free(iprog);
1247                         }
1248                         argv[0] = argv0;
1249                 }
1250                 else
1251                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1252                                                fhin, fhout, fherr);
1253                 free(prog);
1254         }
1255         free_path_split(path);
1256         return pid;
1257 }
1258
1259 static int try_shell_exec(const char *cmd, char *const *argv)
1260 {
1261         const char *interpr = parse_interpreter(cmd);
1262         char **path;
1263         char *prog;
1264         int pid = 0;
1265
1266         if (!interpr)
1267                 return 0;
1268         path = get_path_split();
1269         prog = path_lookup(interpr, path, 1);
1270         if (prog) {
1271                 int argc = 0;
1272                 const char **argv2;
1273                 while (argv[argc]) argc++;
1274                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1275                 argv2[0] = (char *)cmd; /* full path to the script file */
1276                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1277                 pid = mingw_spawnv(prog, argv2, 1);
1278                 if (pid >= 0) {
1279                         int status;
1280                         if (waitpid(pid, &status, 0) < 0)
1281                                 status = 255;
1282                         exit(status);
1283                 }
1284                 pid = 1;        /* indicate that we tried but failed */
1285                 free(prog);
1286                 free(argv2);
1287         }
1288         free_path_split(path);
1289         return pid;
1290 }
1291
1292 int mingw_execv(const char *cmd, char *const *argv)
1293 {
1294         /* check if git_command is a shell script */
1295         if (!try_shell_exec(cmd, argv)) {
1296                 int pid, status;
1297
1298                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1299                 if (pid < 0)
1300                         return -1;
1301                 if (waitpid(pid, &status, 0) < 0)
1302                         status = 255;
1303                 exit(status);
1304         }
1305         return -1;
1306 }
1307
1308 int mingw_execvp(const char *cmd, char *const *argv)
1309 {
1310         char **path = get_path_split();
1311         char *prog = path_lookup(cmd, path, 0);
1312
1313         if (prog) {
1314                 mingw_execv(prog, argv);
1315                 free(prog);
1316         } else
1317                 errno = ENOENT;
1318
1319         free_path_split(path);
1320         return -1;
1321 }
1322
1323 int mingw_kill(pid_t pid, int sig)
1324 {
1325         if (pid > 0 && sig == SIGTERM) {
1326                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1327
1328                 if (TerminateProcess(h, -1)) {
1329                         CloseHandle(h);
1330                         return 0;
1331                 }
1332
1333                 errno = err_win_to_posix(GetLastError());
1334                 CloseHandle(h);
1335                 return -1;
1336         } else if (pid > 0 && sig == 0) {
1337                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1338                 if (h) {
1339                         CloseHandle(h);
1340                         return 0;
1341                 }
1342         }
1343
1344         errno = EINVAL;
1345         return -1;
1346 }
1347
1348 /*
1349  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1350  * that service contains a numerical port, or that it is null. It
1351  * does a simple search using gethostbyname, and returns one IPv4 host
1352  * if one was found.
1353  */
1354 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1355                                    const struct addrinfo *hints,
1356                                    struct addrinfo **res)
1357 {
1358         struct hostent *h = NULL;
1359         struct addrinfo *ai;
1360         struct sockaddr_in *sin;
1361
1362         if (node) {
1363                 h = gethostbyname(node);
1364                 if (!h)
1365                         return WSAGetLastError();
1366         }
1367
1368         ai = xmalloc(sizeof(struct addrinfo));
1369         *res = ai;
1370         ai->ai_flags = 0;
1371         ai->ai_family = AF_INET;
1372         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1373         switch (ai->ai_socktype) {
1374         case SOCK_STREAM:
1375                 ai->ai_protocol = IPPROTO_TCP;
1376                 break;
1377         case SOCK_DGRAM:
1378                 ai->ai_protocol = IPPROTO_UDP;
1379                 break;
1380         default:
1381                 ai->ai_protocol = 0;
1382                 break;
1383         }
1384         ai->ai_addrlen = sizeof(struct sockaddr_in);
1385         if (hints && (hints->ai_flags & AI_CANONNAME))
1386                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1387         else
1388                 ai->ai_canonname = NULL;
1389
1390         sin = xmalloc(ai->ai_addrlen);
1391         memset(sin, 0, ai->ai_addrlen);
1392         sin->sin_family = AF_INET;
1393         /* Note: getaddrinfo is supposed to allow service to be a string,
1394          * which should be looked up using getservbyname. This is
1395          * currently not implemented */
1396         if (service)
1397                 sin->sin_port = htons(atoi(service));
1398         if (h)
1399                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1400         else if (hints && (hints->ai_flags & AI_PASSIVE))
1401                 sin->sin_addr.s_addr = INADDR_ANY;
1402         else
1403                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1404         ai->ai_addr = (struct sockaddr *)sin;
1405         ai->ai_next = NULL;
1406         return 0;
1407 }
1408
1409 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1410 {
1411         free(res->ai_canonname);
1412         free(res->ai_addr);
1413         free(res);
1414 }
1415
1416 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1417                                    char *host, DWORD hostlen,
1418                                    char *serv, DWORD servlen, int flags)
1419 {
1420         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1421         if (sa->sa_family != AF_INET)
1422                 return EAI_FAMILY;
1423         if (!host && !serv)
1424                 return EAI_NONAME;
1425
1426         if (host && hostlen > 0) {
1427                 struct hostent *ent = NULL;
1428                 if (!(flags & NI_NUMERICHOST))
1429                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1430                                             sizeof(sin->sin_addr), AF_INET);
1431
1432                 if (ent)
1433                         snprintf(host, hostlen, "%s", ent->h_name);
1434                 else if (flags & NI_NAMEREQD)
1435                         return EAI_NONAME;
1436                 else
1437                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1438         }
1439
1440         if (serv && servlen > 0) {
1441                 struct servent *ent = NULL;
1442                 if (!(flags & NI_NUMERICSERV))
1443                         ent = getservbyport(sin->sin_port,
1444                                             flags & NI_DGRAM ? "udp" : "tcp");
1445
1446                 if (ent)
1447                         snprintf(serv, servlen, "%s", ent->s_name);
1448                 else
1449                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1450         }
1451
1452         return 0;
1453 }
1454
1455 static HMODULE ipv6_dll = NULL;
1456 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1457 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1458                                       const struct addrinfo *hints,
1459                                       struct addrinfo **res);
1460 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1461                                       char *host, DWORD hostlen,
1462                                       char *serv, DWORD servlen, int flags);
1463 /*
1464  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1465  * don't need to try to load that one dynamically.
1466  */
1467
1468 static void socket_cleanup(void)
1469 {
1470         WSACleanup();
1471         if (ipv6_dll)
1472                 FreeLibrary(ipv6_dll);
1473         ipv6_dll = NULL;
1474         ipv6_freeaddrinfo = freeaddrinfo_stub;
1475         ipv6_getaddrinfo = getaddrinfo_stub;
1476         ipv6_getnameinfo = getnameinfo_stub;
1477 }
1478
1479 static void ensure_socket_initialization(void)
1480 {
1481         WSADATA wsa;
1482         static int initialized = 0;
1483         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1484         const char **name;
1485
1486         if (initialized)
1487                 return;
1488
1489         if (WSAStartup(MAKEWORD(2,2), &wsa))
1490                 die("unable to initialize winsock subsystem, error %d",
1491                         WSAGetLastError());
1492
1493         for (name = libraries; *name; name++) {
1494                 ipv6_dll = LoadLibrary(*name);
1495                 if (!ipv6_dll)
1496                         continue;
1497
1498                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1499                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1500                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1501                                                    const struct addrinfo *,
1502                                                    struct addrinfo **))
1503                         GetProcAddress(ipv6_dll, "getaddrinfo");
1504                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1505                                                    socklen_t, char *, DWORD,
1506                                                    char *, DWORD, int))
1507                         GetProcAddress(ipv6_dll, "getnameinfo");
1508                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1509                         FreeLibrary(ipv6_dll);
1510                         ipv6_dll = NULL;
1511                 } else
1512                         break;
1513         }
1514         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1515                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1516                 ipv6_getaddrinfo = getaddrinfo_stub;
1517                 ipv6_getnameinfo = getnameinfo_stub;
1518         }
1519
1520         atexit(socket_cleanup);
1521         initialized = 1;
1522 }
1523
1524 #undef gethostname
1525 int mingw_gethostname(char *name, int namelen)
1526 {
1527     ensure_socket_initialization();
1528     return gethostname(name, namelen);
1529 }
1530
1531 #undef gethostbyname
1532 struct hostent *mingw_gethostbyname(const char *host)
1533 {
1534         ensure_socket_initialization();
1535         return gethostbyname(host);
1536 }
1537
1538 void mingw_freeaddrinfo(struct addrinfo *res)
1539 {
1540         ipv6_freeaddrinfo(res);
1541 }
1542
1543 int mingw_getaddrinfo(const char *node, const char *service,
1544                       const struct addrinfo *hints, struct addrinfo **res)
1545 {
1546         ensure_socket_initialization();
1547         return ipv6_getaddrinfo(node, service, hints, res);
1548 }
1549
1550 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1551                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1552                       int flags)
1553 {
1554         ensure_socket_initialization();
1555         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1556 }
1557
1558 int mingw_socket(int domain, int type, int protocol)
1559 {
1560         int sockfd;
1561         SOCKET s;
1562
1563         ensure_socket_initialization();
1564         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1565         if (s == INVALID_SOCKET) {
1566                 /*
1567                  * WSAGetLastError() values are regular BSD error codes
1568                  * biased by WSABASEERR.
1569                  * However, strerror() does not know about networking
1570                  * specific errors, which are values beginning at 38 or so.
1571                  * Therefore, we choose to leave the biased error code
1572                  * in errno so that _if_ someone looks up the code somewhere,
1573                  * then it is at least the number that are usually listed.
1574                  */
1575                 errno = WSAGetLastError();
1576                 return -1;
1577         }
1578         /* convert into a file descriptor */
1579         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1580                 closesocket(s);
1581                 return error("unable to make a socket file descriptor: %s",
1582                         strerror(errno));
1583         }
1584         return sockfd;
1585 }
1586
1587 #undef connect
1588 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1589 {
1590         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1591         return connect(s, sa, sz);
1592 }
1593
1594 #undef bind
1595 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1596 {
1597         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1598         return bind(s, sa, sz);
1599 }
1600
1601 #undef setsockopt
1602 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1603 {
1604         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1605         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1606 }
1607
1608 #undef shutdown
1609 int mingw_shutdown(int sockfd, int how)
1610 {
1611         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1612         return shutdown(s, how);
1613 }
1614
1615 #undef listen
1616 int mingw_listen(int sockfd, int backlog)
1617 {
1618         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1619         return listen(s, backlog);
1620 }
1621
1622 #undef accept
1623 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1624 {
1625         int sockfd2;
1626
1627         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1628         SOCKET s2 = accept(s1, sa, sz);
1629
1630         /* convert into a file descriptor */
1631         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1632                 int err = errno;
1633                 closesocket(s2);
1634                 return error("unable to make a socket file descriptor: %s",
1635                         strerror(err));
1636         }
1637         return sockfd2;
1638 }
1639
1640 #undef rename
1641 int mingw_rename(const char *pold, const char *pnew)
1642 {
1643         DWORD attrs, gle;
1644         int tries = 0;
1645         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1646         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1647                 return -1;
1648
1649         /*
1650          * Try native rename() first to get errno right.
1651          * It is based on MoveFile(), which cannot overwrite existing files.
1652          */
1653         if (!_wrename(wpold, wpnew))
1654                 return 0;
1655         if (errno != EEXIST)
1656                 return -1;
1657 repeat:
1658         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1659                 return 0;
1660         /* TODO: translate more errors */
1661         gle = GetLastError();
1662         if (gle == ERROR_ACCESS_DENIED &&
1663             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1664                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1665                         errno = EISDIR;
1666                         return -1;
1667                 }
1668                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1669                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1670                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1671                                 return 0;
1672                         gle = GetLastError();
1673                         /* revert file attributes on failure */
1674                         SetFileAttributesW(wpnew, attrs);
1675                 }
1676         }
1677         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1678                 /*
1679                  * We assume that some other process had the source or
1680                  * destination file open at the wrong moment and retry.
1681                  * In order to give the other process a higher chance to
1682                  * complete its operation, we give up our time slice now.
1683                  * If we have to retry again, we do sleep a bit.
1684                  */
1685                 Sleep(delay[tries]);
1686                 tries++;
1687                 goto repeat;
1688         }
1689         if (gle == ERROR_ACCESS_DENIED &&
1690                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1691                        "Should I try again?", pold, pnew))
1692                 goto repeat;
1693
1694         errno = EACCES;
1695         return -1;
1696 }
1697
1698 /*
1699  * Note that this doesn't return the actual pagesize, but
1700  * the allocation granularity. If future Windows specific git code
1701  * needs the real getpagesize function, we need to find another solution.
1702  */
1703 int mingw_getpagesize(void)
1704 {
1705         SYSTEM_INFO si;
1706         GetSystemInfo(&si);
1707         return si.dwAllocationGranularity;
1708 }
1709
1710 struct passwd *getpwuid(int uid)
1711 {
1712         static char user_name[100];
1713         static struct passwd p;
1714
1715         DWORD len = sizeof(user_name);
1716         if (!GetUserName(user_name, &len))
1717                 return NULL;
1718         p.pw_name = user_name;
1719         p.pw_gecos = "unknown";
1720         p.pw_dir = NULL;
1721         return &p;
1722 }
1723
1724 static HANDLE timer_event;
1725 static HANDLE timer_thread;
1726 static int timer_interval;
1727 static int one_shot;
1728 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1729
1730 /* The timer works like this:
1731  * The thread, ticktack(), is a trivial routine that most of the time
1732  * only waits to receive the signal to terminate. The main thread tells
1733  * the thread to terminate by setting the timer_event to the signalled
1734  * state.
1735  * But ticktack() interrupts the wait state after the timer's interval
1736  * length to call the signal handler.
1737  */
1738
1739 static unsigned __stdcall ticktack(void *dummy)
1740 {
1741         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1742                 mingw_raise(SIGALRM);
1743                 if (one_shot)
1744                         break;
1745         }
1746         return 0;
1747 }
1748
1749 static int start_timer_thread(void)
1750 {
1751         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1752         if (timer_event) {
1753                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1754                 if (!timer_thread )
1755                         return errno = ENOMEM,
1756                                 error("cannot start timer thread");
1757         } else
1758                 return errno = ENOMEM,
1759                         error("cannot allocate resources for timer");
1760         return 0;
1761 }
1762
1763 static void stop_timer_thread(void)
1764 {
1765         if (timer_event)
1766                 SetEvent(timer_event);  /* tell thread to terminate */
1767         if (timer_thread) {
1768                 int rc = WaitForSingleObject(timer_thread, 1000);
1769                 if (rc == WAIT_TIMEOUT)
1770                         error("timer thread did not terminate timely");
1771                 else if (rc != WAIT_OBJECT_0)
1772                         error("waiting for timer thread failed: %lu",
1773                               GetLastError());
1774                 CloseHandle(timer_thread);
1775         }
1776         if (timer_event)
1777                 CloseHandle(timer_event);
1778         timer_event = NULL;
1779         timer_thread = NULL;
1780 }
1781
1782 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1783 {
1784         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1785 }
1786
1787 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1788 {
1789         static const struct timeval zero;
1790         static int atexit_done;
1791
1792         if (out != NULL)
1793                 return errno = EINVAL,
1794                         error("setitimer param 3 != NULL not implemented");
1795         if (!is_timeval_eq(&in->it_interval, &zero) &&
1796             !is_timeval_eq(&in->it_interval, &in->it_value))
1797                 return errno = EINVAL,
1798                         error("setitimer: it_interval must be zero or eq it_value");
1799
1800         if (timer_thread)
1801                 stop_timer_thread();
1802
1803         if (is_timeval_eq(&in->it_value, &zero) &&
1804             is_timeval_eq(&in->it_interval, &zero))
1805                 return 0;
1806
1807         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1808         one_shot = is_timeval_eq(&in->it_interval, &zero);
1809         if (!atexit_done) {
1810                 atexit(stop_timer_thread);
1811                 atexit_done = 1;
1812         }
1813         return start_timer_thread();
1814 }
1815
1816 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1817 {
1818         if (sig != SIGALRM)
1819                 return errno = EINVAL,
1820                         error("sigaction only implemented for SIGALRM");
1821         if (out != NULL)
1822                 return errno = EINVAL,
1823                         error("sigaction: param 3 != NULL not implemented");
1824
1825         timer_fn = in->sa_handler;
1826         return 0;
1827 }
1828
1829 #undef signal
1830 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1831 {
1832         sig_handler_t old;
1833
1834         switch (sig) {
1835         case SIGALRM:
1836                 old = timer_fn;
1837                 timer_fn = handler;
1838                 break;
1839
1840         case SIGINT:
1841                 old = sigint_fn;
1842                 sigint_fn = handler;
1843                 break;
1844
1845         default:
1846                 return signal(sig, handler);
1847         }
1848
1849         return old;
1850 }
1851
1852 #undef raise
1853 int mingw_raise(int sig)
1854 {
1855         switch (sig) {
1856         case SIGALRM:
1857                 if (timer_fn == SIG_DFL) {
1858                         if (isatty(STDERR_FILENO))
1859                                 fputs("Alarm clock\n", stderr);
1860                         exit(128 + SIGALRM);
1861                 } else if (timer_fn != SIG_IGN)
1862                         timer_fn(SIGALRM);
1863                 return 0;
1864
1865         case SIGINT:
1866                 if (sigint_fn == SIG_DFL)
1867                         exit(128 + SIGINT);
1868                 else if (sigint_fn != SIG_IGN)
1869                         sigint_fn(SIGINT);
1870                 return 0;
1871
1872         default:
1873                 return raise(sig);
1874         }
1875 }
1876
1877
1878 static const char *make_backslash_path(const char *path)
1879 {
1880         static char buf[PATH_MAX + 1];
1881         char *c;
1882
1883         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1884                 die("Too long path: %.*s", 60, path);
1885
1886         for (c = buf; *c; c++) {
1887                 if (*c == '/')
1888                         *c = '\\';
1889         }
1890         return buf;
1891 }
1892
1893 void mingw_open_html(const char *unixpath)
1894 {
1895         const char *htmlpath = make_backslash_path(unixpath);
1896         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1897                         const char *, const char *, const char *, INT);
1898         T ShellExecute;
1899         HMODULE shell32;
1900         int r;
1901
1902         shell32 = LoadLibrary("shell32.dll");
1903         if (!shell32)
1904                 die("cannot load shell32.dll");
1905         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1906         if (!ShellExecute)
1907                 die("cannot run browser");
1908
1909         printf("Launching default browser to display HTML ...\n");
1910         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1911         FreeLibrary(shell32);
1912         /* see the MSDN documentation referring to the result codes here */
1913         if (r <= 32) {
1914                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1915         }
1916 }
1917
1918 int link(const char *oldpath, const char *newpath)
1919 {
1920         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1921         static T create_hard_link = NULL;
1922         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1923         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1924                 xutftowcs_path(wnewpath, newpath) < 0)
1925                 return -1;
1926
1927         if (!create_hard_link) {
1928                 create_hard_link = (T) GetProcAddress(
1929                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1930                 if (!create_hard_link)
1931                         create_hard_link = (T)-1;
1932         }
1933         if (create_hard_link == (T)-1) {
1934                 errno = ENOSYS;
1935                 return -1;
1936         }
1937         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1938                 errno = err_win_to_posix(GetLastError());
1939                 return -1;
1940         }
1941         return 0;
1942 }
1943
1944 pid_t waitpid(pid_t pid, int *status, int options)
1945 {
1946         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1947             FALSE, pid);
1948         if (!h) {
1949                 errno = ECHILD;
1950                 return -1;
1951         }
1952
1953         if (pid > 0 && options & WNOHANG) {
1954                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1955                         CloseHandle(h);
1956                         return 0;
1957                 }
1958                 options &= ~WNOHANG;
1959         }
1960
1961         if (options == 0) {
1962                 struct pinfo_t **ppinfo;
1963                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1964                         CloseHandle(h);
1965                         return 0;
1966                 }
1967
1968                 if (status)
1969                         GetExitCodeProcess(h, (LPDWORD)status);
1970
1971                 EnterCriticalSection(&pinfo_cs);
1972
1973                 ppinfo = &pinfo;
1974                 while (*ppinfo) {
1975                         struct pinfo_t *info = *ppinfo;
1976                         if (info->pid == pid) {
1977                                 CloseHandle(info->proc);
1978                                 *ppinfo = info->next;
1979                                 free(info);
1980                                 break;
1981                         }
1982                         ppinfo = &info->next;
1983                 }
1984
1985                 LeaveCriticalSection(&pinfo_cs);
1986
1987                 CloseHandle(h);
1988                 return pid;
1989         }
1990         CloseHandle(h);
1991
1992         errno = EINVAL;
1993         return -1;
1994 }
1995
1996 const char *get_windows_home_directory(void)
1997 {
1998         static const char *home_directory = NULL;
1999         struct strbuf buf = STRBUF_INIT;
2000
2001         if (home_directory)
2002                 return home_directory;
2003
2004         home_directory = getenv("HOME");
2005         if (home_directory && *home_directory)
2006                 return home_directory;
2007
2008         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
2009         home_directory = strbuf_detach(&buf, NULL);
2010
2011         return home_directory;
2012 }
2013
2014 int mingw_offset_1st_component(const char *path)
2015 {
2016         int offset = 0;
2017         if (has_dos_drive_prefix(path))
2018                 offset = 2;
2019
2020         /* unc paths */
2021         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
2022
2023                 /* skip server name */
2024                 char *pos = strpbrk(path + 2, "\\/");
2025                 if (!pos)
2026                         return 0; /* Error: malformed unc path */
2027
2028                 do {
2029                         pos++;
2030                 } while (*pos && !is_dir_sep(*pos));
2031
2032                 offset = pos - path;
2033         }
2034
2035         return offset + is_dir_sep(path[offset]);
2036 }
2037
2038 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2039 {
2040         int upos = 0, wpos = 0;
2041         const unsigned char *utf = (const unsigned char*) utfs;
2042         if (!utf || !wcs || wcslen < 1) {
2043                 errno = EINVAL;
2044                 return -1;
2045         }
2046         /* reserve space for \0 */
2047         wcslen--;
2048         if (utflen < 0)
2049                 utflen = INT_MAX;
2050
2051         while (upos < utflen) {
2052                 int c = utf[upos++] & 0xff;
2053                 if (utflen == INT_MAX && c == 0)
2054                         break;
2055
2056                 if (wpos >= wcslen) {
2057                         wcs[wpos] = 0;
2058                         errno = ERANGE;
2059                         return -1;
2060                 }
2061
2062                 if (c < 0x80) {
2063                         /* ASCII */
2064                         wcs[wpos++] = c;
2065                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2066                                 (utf[upos] & 0xc0) == 0x80) {
2067                         /* 2-byte utf-8 */
2068                         c = ((c & 0x1f) << 6);
2069                         c |= (utf[upos++] & 0x3f);
2070                         wcs[wpos++] = c;
2071                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2072                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2073                                 (utf[upos] & 0xc0) == 0x80 &&
2074                                 (utf[upos + 1] & 0xc0) == 0x80) {
2075                         /* 3-byte utf-8 */
2076                         c = ((c & 0x0f) << 12);
2077                         c |= ((utf[upos++] & 0x3f) << 6);
2078                         c |= (utf[upos++] & 0x3f);
2079                         wcs[wpos++] = c;
2080                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2081                                 wpos + 1 < wcslen &&
2082                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2083                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2084                                 (utf[upos] & 0xc0) == 0x80 &&
2085                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2086                                 (utf[upos + 2] & 0xc0) == 0x80) {
2087                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2088                         c = ((c & 0x07) << 18);
2089                         c |= ((utf[upos++] & 0x3f) << 12);
2090                         c |= ((utf[upos++] & 0x3f) << 6);
2091                         c |= (utf[upos++] & 0x3f);
2092                         c -= 0x10000;
2093                         wcs[wpos++] = 0xd800 | (c >> 10);
2094                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2095                 } else if (c >= 0xa0) {
2096                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2097                         wcs[wpos++] = c;
2098                 } else {
2099                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2100                         static const char *hex = "0123456789abcdef";
2101                         wcs[wpos++] = hex[c >> 4];
2102                         if (wpos < wcslen)
2103                                 wcs[wpos++] = hex[c & 0x0f];
2104                 }
2105         }
2106         wcs[wpos] = 0;
2107         return wpos;
2108 }
2109
2110 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2111 {
2112         if (!wcs || !utf || utflen < 1) {
2113                 errno = EINVAL;
2114                 return -1;
2115         }
2116         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2117         if (utflen)
2118                 return utflen - 1;
2119         errno = ERANGE;
2120         return -1;
2121 }
2122
2123 /*
2124  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2125  * mingw startup code, see init.c in mingw runtime).
2126  */
2127 int _CRT_glob = 0;
2128
2129 typedef struct {
2130         int newmode;
2131 } _startupinfo;
2132
2133 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2134                 _startupinfo *si);
2135
2136 static NORETURN void die_startup()
2137 {
2138         fputs("fatal: not enough memory for initialization", stderr);
2139         exit(128);
2140 }
2141
2142 static void *malloc_startup(size_t size)
2143 {
2144         void *result = malloc(size);
2145         if (!result)
2146                 die_startup();
2147         return result;
2148 }
2149
2150 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2151 {
2152         len = xwcstoutf(buffer, wcs, len) + 1;
2153         return memcpy(malloc_startup(len), buffer, len);
2154 }
2155
2156 void mingw_startup()
2157 {
2158         int i, maxlen, argc;
2159         char *buffer;
2160         wchar_t **wenv, **wargv;
2161         _startupinfo si;
2162
2163         /* get wide char arguments and environment */
2164         si.newmode = 0;
2165         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2166                 die_startup();
2167
2168         /* determine size of argv and environ conversion buffer */
2169         maxlen = wcslen(_wpgmptr);
2170         for (i = 1; i < argc; i++)
2171                 maxlen = max(maxlen, wcslen(wargv[i]));
2172         for (i = 0; wenv[i]; i++)
2173                 maxlen = max(maxlen, wcslen(wenv[i]));
2174
2175         /*
2176          * nedmalloc can't free CRT memory, allocate resizable environment
2177          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2178          * use it while initializing the environment itself.
2179          */
2180         environ_size = i + 1;
2181         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2182         environ = malloc_startup(environ_alloc);
2183
2184         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2185         maxlen = 3 * maxlen + 1;
2186         buffer = malloc_startup(maxlen);
2187
2188         /* convert command line arguments and environment to UTF-8 */
2189         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2190         for (i = 1; i < argc; i++)
2191                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2192         for (i = 0; wenv[i]; i++)
2193                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2194         environ[i] = NULL;
2195         free(buffer);
2196
2197         /* sort environment for O(log n) getenv / putenv */
2198         qsort(environ, i, sizeof(char*), compareenv);
2199
2200         /* fix Windows specific environment settings */
2201
2202         /* on Windows it is TMP and TEMP */
2203         if (!getenv("TMPDIR")) {
2204                 const char *tmp = getenv("TMP");
2205                 if (!tmp)
2206                         tmp = getenv("TEMP");
2207                 if (tmp)
2208                         setenv("TMPDIR", tmp, 1);
2209         }
2210
2211         /* simulate TERM to enable auto-color (see color.c) */
2212         if (!getenv("TERM"))
2213                 setenv("TERM", "winansi", 1);
2214
2215         /* initialize critical section for waitpid pinfo_t list */
2216         InitializeCriticalSection(&pinfo_cs);
2217
2218         /* set up default file mode and file modes for stdin/out/err */
2219         _fmode = _O_BINARY;
2220         _setmode(_fileno(stdin), _O_BINARY);
2221         _setmode(_fileno(stdout), _O_BINARY);
2222         _setmode(_fileno(stderr), _O_BINARY);
2223
2224         /* initialize Unicode console */
2225         winansi_init();
2226 }