compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <wchar.h>
   5 #include "../strbuf.h"
   6 #include "../run-command.h"
   7 #include "../cache.h"
   8
   9 static const int delay[] = { 0, 1, 10, 20, 40 };
  10 unsigned int _CRT_fmode = _O_BINARY;
  11
  12 int err_win_to_posix(DWORD winerr)
  13 {
  14         int error = ENOSYS;
  15         switch(winerr) {
  16         case ERROR_ACCESS_DENIED: error = EACCES; break;
  17         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  18         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  19         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  20         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  21         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  22         case ERROR_BAD_COMMAND: error = EIO; break;
  23         case ERROR_BAD_DEVICE: error = ENODEV; break;
  24         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  25         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  27         case ERROR_BAD_LENGTH: error = EINVAL; break;
  28         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  29         case ERROR_BAD_PIPE: error = EPIPE; break;
  30         case ERROR_BAD_UNIT: error = ENODEV; break;
  31         case ERROR_BAD_USERNAME: error = EINVAL; break;
  32         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  33         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  34         case ERROR_BUSY: error = EBUSY; break;
  35         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  36         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  37         case ERROR_CANNOT_MAKE: error = EACCES; break;
  38         case ERROR_CANTOPEN: error = EIO; break;
  39         case ERROR_CANTREAD: error = EIO; break;
  40         case ERROR_CANTWRITE: error = EIO; break;
  41         case ERROR_CRC: error = EIO; break;
  42         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  43         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  44         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  45         case ERROR_DIRECTORY: error = EINVAL; break;
  46         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  47         case ERROR_DISK_CHANGE: error = EIO; break;
  48         case ERROR_DISK_FULL: error = ENOSPC; break;
  49         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  50         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  51         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  52         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  53         case ERROR_FILE_EXISTS: error = EEXIST; break;
  54         case ERROR_FILE_INVALID: error = ENODEV; break;
  55         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  56         case ERROR_GEN_FAILURE: error = EIO; break;
  57         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  58         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  59         case ERROR_INVALID_ACCESS: error = EACCES; break;
  60         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  61         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  62         case ERROR_INVALID_DATA: error = EINVAL; break;
  63         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  64         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  65         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  66         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  67         case ERROR_INVALID_HANDLE: error = EBADF; break;
  68         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  69         case ERROR_INVALID_NAME: error = EINVAL; break;
  70         case ERROR_INVALID_OWNER: error = EINVAL; break;
  71         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  72         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  73         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  74         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  75         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  76         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  77         case ERROR_IO_DEVICE: error = EIO; break;
  78         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  79         case ERROR_LOCKED: error = EBUSY; break;
  80         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  81         case ERROR_LOGON_FAILURE: error = EACCES; break;
  82         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  83         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  84         case ERROR_MORE_DATA: error = EPIPE; break;
  85         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  86         case ERROR_NOACCESS: error = EFAULT; break;
  87         case ERROR_NONE_MAPPED: error = EINVAL; break;
  88         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  89         case ERROR_NOT_READY: error = EAGAIN; break;
  90         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  91         case ERROR_NO_DATA: error = EPIPE; break;
  92         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  93         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  94         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  95         case ERROR_OPEN_FAILED: error = EIO; break;
  96         case ERROR_OPEN_FILES: error = EBUSY; break;
  97         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  98         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  99         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 100         case ERROR_PATH_BUSY: error = EBUSY; break;
 101         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 102         case ERROR_PIPE_BUSY: error = EBUSY; break;
 103         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 104         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 105         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 106         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 107         case ERROR_READ_FAULT: error = EIO; break;
 108         case ERROR_SEEK: error = EIO; break;
 109         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 110         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 111         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 112         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 113         case ERROR_SWAPERROR: error = ENOENT; break;
 114         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 115         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 116         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 117         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 118         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 119         case ERROR_WRITE_FAULT: error = EIO; break;
 120         case ERROR_WRITE_PROTECT: error = EROFS; break;
 121         }
 122         return error;
 123 }
 124
 125 static inline int is_file_in_use_error(DWORD errcode)
 126 {
 127         switch (errcode) {
 128         case ERROR_SHARING_VIOLATION:
 129         case ERROR_ACCESS_DENIED:
 130                 return 1;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static int read_yes_no_answer(void)
 137 {
 138         char answer[1024];
 139
 140         if (fgets(answer, sizeof(answer), stdin)) {
 141                 size_t answer_len = strlen(answer);
 142                 int got_full_line = 0, c;
 143
 144                 /* remove the newline */
 145                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 146                         answer[answer_len-2] = '\0';
 147                         got_full_line = 1;
 148                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 149                         answer[answer_len-1] = '\0';
 150                         got_full_line = 1;
 151                 }
 152                 /* flush the buffer in case we did not get the full line */
 153                 if (!got_full_line)
 154                         while ((c = getchar()) != EOF && c != '\n')
 155                                 ;
 156         } else
 157                 /* we could not read, return the
 158                  * default answer which is no */
 159                 return 0;
 160
 161         if (tolower(answer[0]) == 'y' && !answer[1])
 162                 return 1;
 163         if (!strncasecmp(answer, "yes", sizeof(answer)))
 164                 return 1;
 165         if (tolower(answer[0]) == 'n' && !answer[1])
 166                 return 0;
 167         if (!strncasecmp(answer, "no", sizeof(answer)))
 168                 return 0;
 169
 170         /* did not find an answer we understand */
 171         return -1;
 172 }
 173
 174 static int ask_yes_no_if_possible(const char *format, ...)
 175 {
 176         char question[4096];
 177         const char *retry_hook[] = { NULL, NULL, NULL };
 178         va_list args;
 179
 180         va_start(args, format);
 181         vsnprintf(question, sizeof(question), format, args);
 182         va_end(args);
 183
 184         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 185                 retry_hook[1] = question;
 186                 return !run_command_v_opt(retry_hook, 0);
 187         }
 188
 189         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 190                 return 0;
 191
 192         while (1) {
 193                 int answer;
 194                 fprintf(stderr, "%s (y/n) ", question);
 195
 196                 if ((answer = read_yes_no_answer()) >= 0)
 197                         return answer;
 198
 199                 fprintf(stderr, "Sorry, I did not understand your answer. "
 200                                 "Please type 'y' or 'n'\n");
 201         }
 202 }
 203
 204 int mingw_unlink(const char *pathname)
 205 {
 206         int ret, tries = 0;
 207         wchar_t wpathname[MAX_PATH];
 208         if (xutftowcs_path(wpathname, pathname) < 0)
 209                 return -1;
 210
 211         /* read-only files cannot be removed */
 212         _wchmod(wpathname, 0666);
 213         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 214                 if (!is_file_in_use_error(GetLastError()))
 215                         break;
 216                 /*
 217                  * We assume that some other process had the source or
 218                  * destination file open at the wrong moment and retry.
 219                  * In order to give the other process a higher chance to
 220                  * complete its operation, we give up our time slice now.
 221                  * If we have to retry again, we do sleep a bit.
 222                  */
 223                 Sleep(delay[tries]);
 224                 tries++;
 225         }
 226         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 227                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 228                         "Should I try again?", pathname))
 229                ret = _wunlink(wpathname);
 230         return ret;
 231 }
 232
 233 static int is_dir_empty(const wchar_t *wpath)
 234 {
 235         WIN32_FIND_DATAW findbuf;
 236         HANDLE handle;
 237         wchar_t wbuf[MAX_PATH + 2];
 238         wcscpy(wbuf, wpath);
 239         wcscat(wbuf, L"\\*");
 240         handle = FindFirstFileW(wbuf, &findbuf);
 241         if (handle == INVALID_HANDLE_VALUE)
 242                 return GetLastError() == ERROR_NO_MORE_FILES;
 243
 244         while (!wcscmp(findbuf.cFileName, L".") ||
 245                         !wcscmp(findbuf.cFileName, L".."))
 246                 if (!FindNextFileW(handle, &findbuf))
 247                         return GetLastError() == ERROR_NO_MORE_FILES;
 248         FindClose(handle);
 249         return 0;
 250 }
 251
 252 int mingw_rmdir(const char *pathname)
 253 {
 254         int ret, tries = 0;
 255         wchar_t wpathname[MAX_PATH];
 256         if (xutftowcs_path(wpathname, pathname) < 0)
 257                 return -1;
 258
 259         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 260                 if (!is_file_in_use_error(GetLastError()))
 261                         errno = err_win_to_posix(GetLastError());
 262                 if (errno != EACCES)
 263                         break;
 264                 if (!is_dir_empty(wpathname)) {
 265                         errno = ENOTEMPTY;
 266                         break;
 267                 }
 268                 /*
 269                  * We assume that some other process had the source or
 270                  * destination file open at the wrong moment and retry.
 271                  * In order to give the other process a higher chance to
 272                  * complete its operation, we give up our time slice now.
 273                  * If we have to retry again, we do sleep a bit.
 274                  */
 275                 Sleep(delay[tries]);
 276                 tries++;
 277         }
 278         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 279                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 280                         "Should I try again?", pathname))
 281                ret = _wrmdir(wpathname);
 282         return ret;
 283 }
 284
 285 static int make_hidden(const wchar_t *path)
 286 {
 287         DWORD attribs = GetFileAttributesW(path);
 288         if (SetFileAttributesW(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 289                 return 0;
 290         errno = err_win_to_posix(GetLastError());
 291         return -1;
 292 }
 293
 294 void mingw_mark_as_git_dir(const char *dir)
 295 {
 296         wchar_t wdir[MAX_PATH];
 297         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository())
 298                 if (xutftowcs_path(wdir, dir) < 0 || make_hidden(wdir))
 299                         warning("Failed to make '%s' hidden", dir);
 300         git_config_set("core.hideDotFiles",
 301                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 302                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 303                  "dotGitOnly" : "true"));
 304 }
 305
 306 int mingw_mkdir(const char *path, int mode)
 307 {
 308         int ret;
 309         wchar_t wpath[MAX_PATH];
 310         if (xutftowcs_path(wpath, path) < 0)
 311                 return -1;
 312         ret = _wmkdir(wpath);
 313         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 314                 /*
 315                  * In Windows a file or dir starting with a dot is not
 316                  * automatically hidden. So lets mark it as hidden when
 317                  * such a directory is created.
 318                  */
 319                 const char *start = basename((char*)path);
 320                 if (*start == '.')
 321                         return make_hidden(wpath);
 322         }
 323         return ret;
 324 }
 325
 326 int mingw_open (const char *filename, int oflags, ...)
 327 {
 328         va_list args;
 329         unsigned mode;
 330         int fd;
 331         wchar_t wfilename[MAX_PATH];
 332
 333         va_start(args, oflags);
 334         mode = va_arg(args, int);
 335         va_end(args);
 336
 337         if (filename && !strcmp(filename, "/dev/null"))
 338                 filename = "nul";
 339
 340         if (xutftowcs_path(wfilename, filename) < 0)
 341                 return -1;
 342         fd = _wopen(wfilename, oflags, mode);
 343
 344         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 345                 DWORD attrs = GetFileAttributesW(wfilename);
 346                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 347                         errno = EISDIR;
 348         }
 349         if ((oflags & O_CREAT) && fd >= 0 &&
 350             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 351                 /*
 352                  * In Windows a file or dir starting with a dot is not
 353                  * automatically hidden. So lets mark it as hidden when
 354                  * such a file is created.
 355                  */
 356                 const char *start = basename((char*)filename);
 357                 if (*start == '.' && make_hidden(wfilename))
 358                         warning("Could not mark '%s' as hidden.", filename);
 359         }
 360         return fd;
 361 }
 362
 363 #undef write
 364 ssize_t mingw_write(int fd, const void *buf, size_t count)
 365 {
 366         /*
 367          * While write() calls to a file on a local disk are translated
 368          * into WriteFile() calls with a maximum size of 64KB on Windows
 369          * XP and 256KB on Vista, no such cap is placed on writes to
 370          * files over the network on Windows XP.  Unfortunately, there
 371          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 372          * bigger writes fail on Windows XP.
 373          * So we cap to a nice 31MB here to avoid write failures over
 374          * the net without changing the number of WriteFile() calls in
 375          * the local case.
 376          */
 377         return write(fd, buf, min(count, 31 * 1024 * 1024));
 378 }
 379
 380 static BOOL WINAPI ctrl_ignore(DWORD type)
 381 {
 382         return TRUE;
 383 }
 384
 385 #undef fgetc
 386 int mingw_fgetc(FILE *stream)
 387 {
 388         int ch;
 389         if (!isatty(_fileno(stream)))
 390                 return fgetc(stream);
 391
 392         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 393         while (1) {
 394                 ch = fgetc(stream);
 395                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 396                         break;
 397
 398                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 399                 mingw_raise(SIGINT);
 400         }
 401         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 402         return ch;
 403 }
 404
 405 #undef fopen
 406 FILE *mingw_fopen (const char *filename, const char *otype)
 407 {
 408         int hide = 0;
 409         FILE *file;
 410         wchar_t wfilename[MAX_PATH], wotype[4];
 411         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 412             basename((char*)filename)[0] == '.')
 413                 hide = access(filename, F_OK);
 414         if (filename && !strcmp(filename, "/dev/null"))
 415                 filename = "nul";
 416         if (xutftowcs_path(wfilename, filename) < 0 ||
 417                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 418                 return NULL;
 419         file = _wfopen(wfilename, wotype);
 420         if (file && hide && make_hidden(wfilename))
 421                 warning("Could not mark '%s' as hidden.", filename);
 422         return file;
 423 }
 424
 425 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 426 {
 427         int hide = 0;
 428         FILE *file;
 429         wchar_t wfilename[MAX_PATH], wotype[4];
 430         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 431             basename((char*)filename)[0] == '.')
 432                 hide = access(filename, F_OK);
 433         if (filename && !strcmp(filename, "/dev/null"))
 434                 filename = "nul";
 435         if (xutftowcs_path(wfilename, filename) < 0 ||
 436                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 437                 return NULL;
 438         file = _wfreopen(wfilename, wotype, stream);
 439         if (file && hide && make_hidden(wfilename))
 440                 warning("Could not mark '%s' as hidden.", filename);
 441         return file;
 442 }
 443
 444 #undef fflush
 445 int mingw_fflush(FILE *stream)
 446 {
 447         int ret = fflush(stream);
 448
 449         /*
 450          * write() is used behind the scenes of stdio output functions.
 451          * Since git code does not check for errors after each stdio write
 452          * operation, it can happen that write() is called by a later
 453          * stdio function even if an earlier write() call failed. In the
 454          * case of a pipe whose readable end was closed, only the first
 455          * call to write() reports EPIPE on Windows. Subsequent write()
 456          * calls report EINVAL. It is impossible to notice whether this
 457          * fflush invocation triggered such a case, therefore, we have to
 458          * catch all EINVAL errors whole-sale.
 459          */
 460         if (ret && errno == EINVAL)
 461                 errno = EPIPE;
 462
 463         return ret;
 464 }
 465
 466 int mingw_access(const char *filename, int mode)
 467 {
 468         wchar_t wfilename[MAX_PATH];
 469         if (xutftowcs_path(wfilename, filename) < 0)
 470                 return -1;
 471         /* X_OK is not supported by the MSVCRT version */
 472         return _waccess(wfilename, mode & ~X_OK);
 473 }
 474
 475 int mingw_chdir(const char *dirname)
 476 {
 477         wchar_t wdirname[MAX_PATH];
 478         if (xutftowcs_path(wdirname, dirname) < 0)
 479                 return -1;
 480         return _wchdir(wdirname);
 481 }
 482
 483 int mingw_chmod(const char *filename, int mode)
 484 {
 485         wchar_t wfilename[MAX_PATH];
 486         if (xutftowcs_path(wfilename, filename) < 0)
 487                 return -1;
 488         return _wchmod(wfilename, mode);
 489 }
 490
 491 /*
 492  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 493  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 494  */
 495 static inline long long filetime_to_hnsec(const FILETIME *ft)
 496 {
 497         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 498         /* Windows to Unix Epoch conversion */
 499         return winTime - 116444736000000000LL;
 500 }
 501
 502 static inline time_t filetime_to_time_t(const FILETIME *ft)
 503 {
 504         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 505 }
 506
 507 /* We keep the do_lstat code in a separate function to avoid recursion.
 508  * When a path ends with a slash, the stat will fail with ENOENT. In
 509  * this case, we strip the trailing slashes and stat again.
 510  *
 511  * If follow is true then act like stat() and report on the link
 512  * target. Otherwise report on the link itself.
 513  */
 514 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 515 {
 516         WIN32_FILE_ATTRIBUTE_DATA fdata;
 517         wchar_t wfilename[MAX_PATH];
 518         if (xutftowcs_path(wfilename, file_name) < 0)
 519                 return -1;
 520
 521         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 522                 buf->st_ino = 0;
 523                 buf->st_gid = 0;
 524                 buf->st_uid = 0;
 525                 buf->st_nlink = 1;
 526                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 527                 buf->st_size = fdata.nFileSizeLow |
 528                         (((off_t)fdata.nFileSizeHigh)<<32);
 529                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 530                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 531                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 532                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 533                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 534                         WIN32_FIND_DATAW findbuf;
 535                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 536                         if (handle != INVALID_HANDLE_VALUE) {
 537                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 538                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 539                                         if (follow) {
 540                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 541                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 542                                         } else {
 543                                                 buf->st_mode = S_IFLNK;
 544                                         }
 545                                         buf->st_mode |= S_IREAD;
 546                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 547                                                 buf->st_mode |= S_IWRITE;
 548                                 }
 549                                 FindClose(handle);
 550                         }
 551                 }
 552                 return 0;
 553         }
 554         switch (GetLastError()) {
 555         case ERROR_ACCESS_DENIED:
 556         case ERROR_SHARING_VIOLATION:
 557         case ERROR_LOCK_VIOLATION:
 558         case ERROR_SHARING_BUFFER_EXCEEDED:
 559                 errno = EACCES;
 560                 break;
 561         case ERROR_BUFFER_OVERFLOW:
 562                 errno = ENAMETOOLONG;
 563                 break;
 564         case ERROR_NOT_ENOUGH_MEMORY:
 565                 errno = ENOMEM;
 566                 break;
 567         default:
 568                 errno = ENOENT;
 569                 break;
 570         }
 571         return -1;
 572 }
 573
 574 /* We provide our own lstat/fstat functions, since the provided
 575  * lstat/fstat functions are so slow. These stat functions are
 576  * tailored for Git's usage (read: fast), and are not meant to be
 577  * complete. Note that Git stat()s are redirected to mingw_lstat()
 578  * too, since Windows doesn't really handle symlinks that well.
 579  */
 580 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 581 {
 582         int namelen;
 583         char alt_name[PATH_MAX];
 584
 585         if (!do_lstat(follow, file_name, buf))
 586                 return 0;
 587
 588         /* if file_name ended in a '/', Windows returned ENOENT;
 589          * try again without trailing slashes
 590          */
 591         if (errno != ENOENT)
 592                 return -1;
 593
 594         namelen = strlen(file_name);
 595         if (namelen && file_name[namelen-1] != '/')
 596                 return -1;
 597         while (namelen && file_name[namelen-1] == '/')
 598                 --namelen;
 599         if (!namelen || namelen >= PATH_MAX)
 600                 return -1;
 601
 602         memcpy(alt_name, file_name, namelen);
 603         alt_name[namelen] = 0;
 604         return do_lstat(follow, alt_name, buf);
 605 }
 606
 607 int mingw_lstat(const char *file_name, struct stat *buf)
 608 {
 609         return do_stat_internal(0, file_name, buf);
 610 }
 611 int mingw_stat(const char *file_name, struct stat *buf)
 612 {
 613         return do_stat_internal(1, file_name, buf);
 614 }
 615
 616 #undef fstat
 617 int mingw_fstat(int fd, struct stat *buf)
 618 {
 619         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 620         BY_HANDLE_FILE_INFORMATION fdata;
 621
 622         if (fh == INVALID_HANDLE_VALUE) {
 623                 errno = EBADF;
 624                 return -1;
 625         }
 626         /* direct non-file handles to MS's fstat() */
 627         if (GetFileType(fh) != FILE_TYPE_DISK)
 628                 return _fstati64(fd, buf);
 629
 630         if (GetFileInformationByHandle(fh, &fdata)) {
 631                 buf->st_ino = 0;
 632                 buf->st_gid = 0;
 633                 buf->st_uid = 0;
 634                 buf->st_nlink = 1;
 635                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 636                 buf->st_size = fdata.nFileSizeLow |
 637                         (((off_t)fdata.nFileSizeHigh)<<32);
 638                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 639                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 640                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 641                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 642                 return 0;
 643         }
 644         errno = EBADF;
 645         return -1;
 646 }
 647
 648 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 649 {
 650         long long winTime = t * 10000000LL + 116444736000000000LL;
 651         ft->dwLowDateTime = winTime;
 652         ft->dwHighDateTime = winTime >> 32;
 653 }
 654
 655 int mingw_utime (const char *file_name, const struct utimbuf *times)
 656 {
 657         FILETIME mft, aft;
 658         int fh, rc;
 659         DWORD attrs;
 660         wchar_t wfilename[MAX_PATH];
 661         if (xutftowcs_path(wfilename, file_name) < 0)
 662                 return -1;
 663
 664         /* must have write permission */
 665         attrs = GetFileAttributesW(wfilename);
 666         if (attrs != INVALID_FILE_ATTRIBUTES &&
 667             (attrs & FILE_ATTRIBUTE_READONLY)) {
 668                 /* ignore errors here; open() will report them */
 669                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 670         }
 671
 672         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 673                 rc = -1;
 674                 goto revert_attrs;
 675         }
 676
 677         if (times) {
 678                 time_t_to_filetime(times->modtime, &mft);
 679                 time_t_to_filetime(times->actime, &aft);
 680         } else {
 681                 GetSystemTimeAsFileTime(&mft);
 682                 aft = mft;
 683         }
 684         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 685                 errno = EINVAL;
 686                 rc = -1;
 687         } else
 688                 rc = 0;
 689         close(fh);
 690
 691 revert_attrs:
 692         if (attrs != INVALID_FILE_ATTRIBUTES &&
 693             (attrs & FILE_ATTRIBUTE_READONLY)) {
 694                 /* ignore errors again */
 695                 SetFileAttributesW(wfilename, attrs);
 696         }
 697         return rc;
 698 }
 699
 700 unsigned int sleep (unsigned int seconds)
 701 {
 702         Sleep(seconds*1000);
 703         return 0;
 704 }
 705
 706 char *mingw_mktemp(char *template)
 707 {
 708         wchar_t wtemplate[MAX_PATH];
 709         if (xutftowcs_path(wtemplate, template) < 0)
 710                 return NULL;
 711         if (!_wmktemp(wtemplate))
 712                 return NULL;
 713         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 714                 return NULL;
 715         return template;
 716 }
 717
 718 int mkstemp(char *template)
 719 {
 720         char *filename = mktemp(template);
 721         if (filename == NULL)
 722                 return -1;
 723         return open(filename, O_RDWR | O_CREAT, 0600);
 724 }
 725
 726 int gettimeofday(struct timeval *tv, void *tz)
 727 {
 728         FILETIME ft;
 729         long long hnsec;
 730
 731         GetSystemTimeAsFileTime(&ft);
 732         hnsec = filetime_to_hnsec(&ft);
 733         tv->tv_sec = hnsec / 10000000;
 734         tv->tv_usec = (hnsec % 10000000) / 10;
 735         return 0;
 736 }
 737
 738 int pipe(int filedes[2])
 739 {
 740         HANDLE h[2];
 741
 742         /* this creates non-inheritable handles */
 743         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 744                 errno = err_win_to_posix(GetLastError());
 745                 return -1;
 746         }
 747         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 748         if (filedes[0] < 0) {
 749                 CloseHandle(h[0]);
 750                 CloseHandle(h[1]);
 751                 return -1;
 752         }
 753         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 754         if (filedes[0] < 0) {
 755                 close(filedes[0]);
 756                 CloseHandle(h[1]);
 757                 return -1;
 758         }
 759         return 0;
 760 }
 761
 762 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 763 {
 764         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 765         memcpy(result, gmtime(timep), sizeof(struct tm));
 766         return result;
 767 }
 768
 769 struct tm *localtime_r(const time_t *timep, struct tm *result)
 770 {
 771         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 772         memcpy(result, localtime(timep), sizeof(struct tm));
 773         return result;
 774 }
 775
 776 char *mingw_getcwd(char *pointer, int len)
 777 {
 778         int i;
 779         wchar_t wpointer[MAX_PATH];
 780         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 781                 return NULL;
 782         if (xwcstoutf(pointer, wpointer, len) < 0)
 783                 return NULL;
 784         for (i = 0; pointer[i]; i++)
 785                 if (pointer[i] == '\\')
 786                         pointer[i] = '/';
 787         return pointer;
 788 }
 789
 790 #undef getenv
 791 char *mingw_getenv(const char *name)
 792 {
 793         char *result = getenv(name);
 794         if (!result && !strcmp(name, "TMPDIR")) {
 795                 /* on Windows it is TMP and TEMP */
 796                 result = getenv("TMP");
 797                 if (!result)
 798                         result = getenv("TEMP");
 799         }
 800         else if (!result && !strcmp(name, "TERM")) {
 801                 /* simulate TERM to enable auto-color (see color.c) */
 802                 result = "winansi";
 803         }
 804         return result;
 805 }
 806
 807 /*
 808  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 809  * (Parsing C++ Command-Line Arguments)
 810  */
 811 static const char *quote_arg(const char *arg)
 812 {
 813         /* count chars to quote */
 814         int len = 0, n = 0;
 815         int force_quotes = 0;
 816         char *q, *d;
 817         const char *p = arg;
 818         if (!*p) force_quotes = 1;
 819         while (*p) {
 820                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 821                         force_quotes = 1;
 822                 else if (*p == '"')
 823                         n++;
 824                 else if (*p == '\\') {
 825                         int count = 0;
 826                         while (*p == '\\') {
 827                                 count++;
 828                                 p++;
 829                                 len++;
 830                         }
 831                         if (*p == '"')
 832                                 n += count*2 + 1;
 833                         continue;
 834                 }
 835                 len++;
 836                 p++;
 837         }
 838         if (!force_quotes && n == 0)
 839                 return arg;
 840
 841         /* insert \ where necessary */
 842         d = q = xmalloc(len+n+3);
 843         *d++ = '"';
 844         while (*arg) {
 845                 if (*arg == '"')
 846                         *d++ = '\\';
 847                 else if (*arg == '\\') {
 848                         int count = 0;
 849                         while (*arg == '\\') {
 850                                 count++;
 851                                 *d++ = *arg++;
 852                         }
 853                         if (*arg == '"') {
 854                                 while (count-- > 0)
 855                                         *d++ = '\\';
 856                                 *d++ = '\\';
 857                         }
 858                 }
 859                 *d++ = *arg++;
 860         }
 861         *d++ = '"';
 862         *d++ = 0;
 863         return q;
 864 }
 865
 866 static const char *parse_interpreter(const char *cmd)
 867 {
 868         static char buf[100];
 869         char *p, *opt;
 870         int n, fd;
 871
 872         /* don't even try a .exe */
 873         n = strlen(cmd);
 874         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 875                 return NULL;
 876
 877         fd = open(cmd, O_RDONLY);
 878         if (fd < 0)
 879                 return NULL;
 880         n = read(fd, buf, sizeof(buf)-1);
 881         close(fd);
 882         if (n < 4)      /* at least '#!/x' and not error */
 883                 return NULL;
 884
 885         if (buf[0] != '#' || buf[1] != '!')
 886                 return NULL;
 887         buf[n] = '\0';
 888         p = buf + strcspn(buf, "\r\n");
 889         if (!*p)
 890                 return NULL;
 891
 892         *p = '\0';
 893         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 894                 return NULL;
 895         /* strip options */
 896         if ((opt = strchr(p+1, ' ')))
 897                 *opt = '\0';
 898         return p+1;
 899 }
 900
 901 /*
 902  * Splits the PATH into parts.
 903  */
 904 static char **get_path_split(void)
 905 {
 906         char *p, **path, *envpath = getenv("PATH");
 907         int i, n = 0;
 908
 909         if (!envpath || !*envpath)
 910                 return NULL;
 911
 912         envpath = xstrdup(envpath);
 913         p = envpath;
 914         while (p) {
 915                 char *dir = p;
 916                 p = strchr(p, ';');
 917                 if (p) *p++ = '\0';
 918                 if (*dir) {     /* not earlier, catches series of ; */
 919                         ++n;
 920                 }
 921         }
 922         if (!n)
 923                 return NULL;
 924
 925         path = xmalloc((n+1)*sizeof(char *));
 926         p = envpath;
 927         i = 0;
 928         do {
 929                 if (*p)
 930                         path[i++] = xstrdup(p);
 931                 p = p+strlen(p)+1;
 932         } while (i < n);
 933         path[i] = NULL;
 934
 935         free(envpath);
 936
 937         return path;
 938 }
 939
 940 static void free_path_split(char **path)
 941 {
 942         char **p = path;
 943
 944         if (!path)
 945                 return;
 946
 947         while (*p)
 948                 free(*p++);
 949         free(path);
 950 }
 951
 952 /*
 953  * exe_only means that we only want to detect .exe files, but not scripts
 954  * (which do not have an extension)
 955  */
 956 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 957 {
 958         char path[MAX_PATH];
 959         wchar_t wpath[MAX_PATH];
 960         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 961
 962         if (xutftowcs_path(wpath, path) < 0)
 963                 return NULL;
 964
 965         if (!isexe && _waccess(wpath, F_OK) == 0)
 966                 return xstrdup(path);
 967         path[strlen(path)-4] = '\0';
 968         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
 969
 970                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY))
 971                         return xstrdup(path);
 972         }
 973         return NULL;
 974 }
 975
 976 /*
 977  * Determines the absolute path of cmd using the split path in path.
 978  * If cmd contains a slash or backslash, no lookup is performed.
 979  */
 980 static char *path_lookup(const char *cmd, char **path, int exe_only)
 981 {
 982         char *prog = NULL;
 983         int len = strlen(cmd);
 984         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 985
 986         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 987                 prog = xstrdup(cmd);
 988
 989         while (!prog && *path)
 990                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 991
 992         return prog;
 993 }
 994
 995 static int env_compare(const void *a, const void *b)
 996 {
 997         char *const *ea = a;
 998         char *const *eb = b;
 999         return strcasecmp(*ea, *eb);
1000 }
1001
1002 struct pinfo_t {
1003         struct pinfo_t *next;
1004         pid_t pid;
1005         HANDLE proc;
1006 };
1007 static struct pinfo_t *pinfo = NULL;
1008 CRITICAL_SECTION pinfo_cs;
1009
1010 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
1011                               const char *dir,
1012                               int prepend_cmd, int fhin, int fhout, int fherr)
1013 {
1014         STARTUPINFOW si;
1015         PROCESS_INFORMATION pi;
1016         struct strbuf args;
1017         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1018         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1019         BOOL ret;
1020
1021         /* Determine whether or not we are associated to a console */
1022         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1023                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1024                         FILE_ATTRIBUTE_NORMAL, NULL);
1025         if (cons == INVALID_HANDLE_VALUE) {
1026                 /* There is no console associated with this process.
1027                  * Since the child is a console process, Windows
1028                  * would normally create a console window. But
1029                  * since we'll be redirecting std streams, we do
1030                  * not need the console.
1031                  * It is necessary to use DETACHED_PROCESS
1032                  * instead of CREATE_NO_WINDOW to make ssh
1033                  * recognize that it has no console.
1034                  */
1035                 flags |= DETACHED_PROCESS;
1036         } else {
1037                 /* There is already a console. If we specified
1038                  * DETACHED_PROCESS here, too, Windows would
1039                  * disassociate the child from the console.
1040                  * The same is true for CREATE_NO_WINDOW.
1041                  * Go figure!
1042                  */
1043                 CloseHandle(cons);
1044         }
1045         memset(&si, 0, sizeof(si));
1046         si.cb = sizeof(si);
1047         si.dwFlags = STARTF_USESTDHANDLES;
1048         si.hStdInput = winansi_get_osfhandle(fhin);
1049         si.hStdOutput = winansi_get_osfhandle(fhout);
1050         si.hStdError = winansi_get_osfhandle(fherr);
1051
1052         if (xutftowcs_path(wcmd, cmd) < 0)
1053                 return -1;
1054         if (dir && xutftowcs_path(wdir, dir) < 0)
1055                 return -1;
1056
1057         /* concatenate argv, quoting args as we go */
1058         strbuf_init(&args, 0);
1059         if (prepend_cmd) {
1060                 char *quoted = (char *)quote_arg(cmd);
1061                 strbuf_addstr(&args, quoted);
1062                 if (quoted != cmd)
1063                         free(quoted);
1064         }
1065         for (; *argv; argv++) {
1066                 char *quoted = (char *)quote_arg(*argv);
1067                 if (*args.buf)
1068                         strbuf_addch(&args, ' ');
1069                 strbuf_addstr(&args, quoted);
1070                 if (quoted != *argv)
1071                         free(quoted);
1072         }
1073
1074         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1075         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1076         strbuf_release(&args);
1077
1078         if (env) {
1079                 int count = 0;
1080                 char **e, **sorted_env;
1081                 int size = 0, wenvsz = 0, wenvpos = 0;
1082
1083                 for (e = env; *e; e++)
1084                         count++;
1085
1086                 /* environment must be sorted */
1087                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
1088                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
1089                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
1090
1091                 /* create environment block from temporary environment */
1092                 for (e = sorted_env; *e; e++) {
1093                         size = 2 * strlen(*e) + 2; /* +2 for final \0 */
1094                         ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1095                         wenvpos += xutftowcs(&wenvblk[wenvpos], *e, size) + 1;
1096                 }
1097                 /* add final \0 terminator */
1098                 wenvblk[wenvpos] = 0;
1099                 free(sorted_env);
1100         }
1101
1102         memset(&pi, 0, sizeof(pi));
1103         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1104                 wenvblk, dir ? wdir : NULL, &si, &pi);
1105
1106         free(wenvblk);
1107         free(wargs);
1108
1109         if (!ret) {
1110                 errno = ENOENT;
1111                 return -1;
1112         }
1113         CloseHandle(pi.hThread);
1114
1115         /*
1116          * The process ID is the human-readable identifier of the process
1117          * that we want to present in log and error messages. The handle
1118          * is not useful for this purpose. But we cannot close it, either,
1119          * because it is not possible to turn a process ID into a process
1120          * handle after the process terminated.
1121          * Keep the handle in a list for waitpid.
1122          */
1123         EnterCriticalSection(&pinfo_cs);
1124         {
1125                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1126                 info->pid = pi.dwProcessId;
1127                 info->proc = pi.hProcess;
1128                 info->next = pinfo;
1129                 pinfo = info;
1130         }
1131         LeaveCriticalSection(&pinfo_cs);
1132
1133         return (pid_t)pi.dwProcessId;
1134 }
1135
1136 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
1137                            int prepend_cmd)
1138 {
1139         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
1140 }
1141
1142 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
1143                      const char *dir,
1144                      int fhin, int fhout, int fherr)
1145 {
1146         pid_t pid;
1147         char **path = get_path_split();
1148         char *prog = path_lookup(cmd, path, 0);
1149
1150         if (!prog) {
1151                 errno = ENOENT;
1152                 pid = -1;
1153         }
1154         else {
1155                 const char *interpr = parse_interpreter(prog);
1156
1157                 if (interpr) {
1158                         const char *argv0 = argv[0];
1159                         char *iprog = path_lookup(interpr, path, 1);
1160                         argv[0] = prog;
1161                         if (!iprog) {
1162                                 errno = ENOENT;
1163                                 pid = -1;
1164                         }
1165                         else {
1166                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1167                                                        fhin, fhout, fherr);
1168                                 free(iprog);
1169                         }
1170                         argv[0] = argv0;
1171                 }
1172                 else
1173                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1174                                                fhin, fhout, fherr);
1175                 free(prog);
1176         }
1177         free_path_split(path);
1178         return pid;
1179 }
1180
1181 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1182 {
1183         const char *interpr = parse_interpreter(cmd);
1184         char **path;
1185         char *prog;
1186         int pid = 0;
1187
1188         if (!interpr)
1189                 return 0;
1190         path = get_path_split();
1191         prog = path_lookup(interpr, path, 1);
1192         if (prog) {
1193                 int argc = 0;
1194                 const char **argv2;
1195                 while (argv[argc]) argc++;
1196                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1197                 argv2[0] = (char *)cmd; /* full path to the script file */
1198                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1199                 pid = mingw_spawnve(prog, argv2, env, 1);
1200                 if (pid >= 0) {
1201                         int status;
1202                         if (waitpid(pid, &status, 0) < 0)
1203                                 status = 255;
1204                         exit(status);
1205                 }
1206                 pid = 1;        /* indicate that we tried but failed */
1207                 free(prog);
1208                 free(argv2);
1209         }
1210         free_path_split(path);
1211         return pid;
1212 }
1213
1214 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1215 {
1216         /* check if git_command is a shell script */
1217         if (!try_shell_exec(cmd, argv, (char **)env)) {
1218                 int pid, status;
1219
1220                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1221                 if (pid < 0)
1222                         return;
1223                 if (waitpid(pid, &status, 0) < 0)
1224                         status = 255;
1225                 exit(status);
1226         }
1227 }
1228
1229 int mingw_execvp(const char *cmd, char *const *argv)
1230 {
1231         char **path = get_path_split();
1232         char *prog = path_lookup(cmd, path, 0);
1233
1234         if (prog) {
1235                 mingw_execve(prog, argv, environ);
1236                 free(prog);
1237         } else
1238                 errno = ENOENT;
1239
1240         free_path_split(path);
1241         return -1;
1242 }
1243
1244 int mingw_execv(const char *cmd, char *const *argv)
1245 {
1246         mingw_execve(cmd, argv, environ);
1247         return -1;
1248 }
1249
1250 int mingw_kill(pid_t pid, int sig)
1251 {
1252         if (pid > 0 && sig == SIGTERM) {
1253                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1254
1255                 if (TerminateProcess(h, -1)) {
1256                         CloseHandle(h);
1257                         return 0;
1258                 }
1259
1260                 errno = err_win_to_posix(GetLastError());
1261                 CloseHandle(h);
1262                 return -1;
1263         }
1264
1265         errno = EINVAL;
1266         return -1;
1267 }
1268
1269 static char **copy_environ(void)
1270 {
1271         char **env;
1272         int i = 0;
1273         while (environ[i])
1274                 i++;
1275         env = xmalloc((i+1)*sizeof(*env));
1276         for (i = 0; environ[i]; i++)
1277                 env[i] = xstrdup(environ[i]);
1278         env[i] = NULL;
1279         return env;
1280 }
1281
1282 void free_environ(char **env)
1283 {
1284         int i;
1285         for (i = 0; env[i]; i++)
1286                 free(env[i]);
1287         free(env);
1288 }
1289
1290 static int lookup_env(char **env, const char *name, size_t nmln)
1291 {
1292         int i;
1293
1294         for (i = 0; env[i]; i++) {
1295                 if (0 == strncmp(env[i], name, nmln)
1296                     && '=' == env[i][nmln])
1297                         /* matches */
1298                         return i;
1299         }
1300         return -1;
1301 }
1302
1303 /*
1304  * If name contains '=', then sets the variable, otherwise it unsets it
1305  */
1306 static char **env_setenv(char **env, const char *name)
1307 {
1308         char *eq = strchrnul(name, '=');
1309         int i = lookup_env(env, name, eq-name);
1310
1311         if (i < 0) {
1312                 if (*eq) {
1313                         for (i = 0; env[i]; i++)
1314                                 ;
1315                         env = xrealloc(env, (i+2)*sizeof(*env));
1316                         env[i] = xstrdup(name);
1317                         env[i+1] = NULL;
1318                 }
1319         }
1320         else {
1321                 free(env[i]);
1322                 if (*eq)
1323                         env[i] = xstrdup(name);
1324                 else
1325                         for (; env[i]; i++)
1326                                 env[i] = env[i+1];
1327         }
1328         return env;
1329 }
1330
1331 /*
1332  * Copies global environ and adjusts variables as specified by vars.
1333  */
1334 char **make_augmented_environ(const char *const *vars)
1335 {
1336         char **env = copy_environ();
1337
1338         while (*vars)
1339                 env = env_setenv(env, *vars++);
1340         return env;
1341 }
1342
1343 /*
1344  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1345  * that service contains a numerical port, or that it is null. It
1346  * does a simple search using gethostbyname, and returns one IPv4 host
1347  * if one was found.
1348  */
1349 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1350                                    const struct addrinfo *hints,
1351                                    struct addrinfo **res)
1352 {
1353         struct hostent *h = NULL;
1354         struct addrinfo *ai;
1355         struct sockaddr_in *sin;
1356
1357         if (node) {
1358                 h = gethostbyname(node);
1359                 if (!h)
1360                         return WSAGetLastError();
1361         }
1362
1363         ai = xmalloc(sizeof(struct addrinfo));
1364         *res = ai;
1365         ai->ai_flags = 0;
1366         ai->ai_family = AF_INET;
1367         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1368         switch (ai->ai_socktype) {
1369         case SOCK_STREAM:
1370                 ai->ai_protocol = IPPROTO_TCP;
1371                 break;
1372         case SOCK_DGRAM:
1373                 ai->ai_protocol = IPPROTO_UDP;
1374                 break;
1375         default:
1376                 ai->ai_protocol = 0;
1377                 break;
1378         }
1379         ai->ai_addrlen = sizeof(struct sockaddr_in);
1380         if (hints && (hints->ai_flags & AI_CANONNAME))
1381                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1382         else
1383                 ai->ai_canonname = NULL;
1384
1385         sin = xmalloc(ai->ai_addrlen);
1386         memset(sin, 0, ai->ai_addrlen);
1387         sin->sin_family = AF_INET;
1388         /* Note: getaddrinfo is supposed to allow service to be a string,
1389          * which should be looked up using getservbyname. This is
1390          * currently not implemented */
1391         if (service)
1392                 sin->sin_port = htons(atoi(service));
1393         if (h)
1394                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1395         else if (hints && (hints->ai_flags & AI_PASSIVE))
1396                 sin->sin_addr.s_addr = INADDR_ANY;
1397         else
1398                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1399         ai->ai_addr = (struct sockaddr *)sin;
1400         ai->ai_next = NULL;
1401         return 0;
1402 }
1403
1404 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1405 {
1406         free(res->ai_canonname);
1407         free(res->ai_addr);
1408         free(res);
1409 }
1410
1411 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1412                                    char *host, DWORD hostlen,
1413                                    char *serv, DWORD servlen, int flags)
1414 {
1415         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1416         if (sa->sa_family != AF_INET)
1417                 return EAI_FAMILY;
1418         if (!host && !serv)
1419                 return EAI_NONAME;
1420
1421         if (host && hostlen > 0) {
1422                 struct hostent *ent = NULL;
1423                 if (!(flags & NI_NUMERICHOST))
1424                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1425                                             sizeof(sin->sin_addr), AF_INET);
1426
1427                 if (ent)
1428                         snprintf(host, hostlen, "%s", ent->h_name);
1429                 else if (flags & NI_NAMEREQD)
1430                         return EAI_NONAME;
1431                 else
1432                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1433         }
1434
1435         if (serv && servlen > 0) {
1436                 struct servent *ent = NULL;
1437                 if (!(flags & NI_NUMERICSERV))
1438                         ent = getservbyport(sin->sin_port,
1439                                             flags & NI_DGRAM ? "udp" : "tcp");
1440
1441                 if (ent)
1442                         snprintf(serv, servlen, "%s", ent->s_name);
1443                 else
1444                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1445         }
1446
1447         return 0;
1448 }
1449
1450 static HMODULE ipv6_dll = NULL;
1451 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1452 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1453                                       const struct addrinfo *hints,
1454                                       struct addrinfo **res);
1455 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1456                                       char *host, DWORD hostlen,
1457                                       char *serv, DWORD servlen, int flags);
1458 /*
1459  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1460  * don't need to try to load that one dynamically.
1461  */
1462
1463 static void socket_cleanup(void)
1464 {
1465         WSACleanup();
1466         if (ipv6_dll)
1467                 FreeLibrary(ipv6_dll);
1468         ipv6_dll = NULL;
1469         ipv6_freeaddrinfo = freeaddrinfo_stub;
1470         ipv6_getaddrinfo = getaddrinfo_stub;
1471         ipv6_getnameinfo = getnameinfo_stub;
1472 }
1473
1474 static void ensure_socket_initialization(void)
1475 {
1476         WSADATA wsa;
1477         static int initialized = 0;
1478         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1479         const char **name;
1480
1481         if (initialized)
1482                 return;
1483
1484         if (WSAStartup(MAKEWORD(2,2), &wsa))
1485                 die("unable to initialize winsock subsystem, error %d",
1486                         WSAGetLastError());
1487
1488         for (name = libraries; *name; name++) {
1489                 ipv6_dll = LoadLibrary(*name);
1490                 if (!ipv6_dll)
1491                         continue;
1492
1493                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1494                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1495                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1496                                                    const struct addrinfo *,
1497                                                    struct addrinfo **))
1498                         GetProcAddress(ipv6_dll, "getaddrinfo");
1499                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1500                                                    socklen_t, char *, DWORD,
1501                                                    char *, DWORD, int))
1502                         GetProcAddress(ipv6_dll, "getnameinfo");
1503                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1504                         FreeLibrary(ipv6_dll);
1505                         ipv6_dll = NULL;
1506                 } else
1507                         break;
1508         }
1509         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1510                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1511                 ipv6_getaddrinfo = getaddrinfo_stub;
1512                 ipv6_getnameinfo = getnameinfo_stub;
1513         }
1514
1515         atexit(socket_cleanup);
1516         initialized = 1;
1517 }
1518
1519 #undef gethostname
1520 int mingw_gethostname(char *name, int namelen)
1521 {
1522     ensure_socket_initialization();
1523     return gethostname(name, namelen);
1524 }
1525
1526 #undef gethostbyname
1527 struct hostent *mingw_gethostbyname(const char *host)
1528 {
1529         ensure_socket_initialization();
1530         return gethostbyname(host);
1531 }
1532
1533 void mingw_freeaddrinfo(struct addrinfo *res)
1534 {
1535         ipv6_freeaddrinfo(res);
1536 }
1537
1538 int mingw_getaddrinfo(const char *node, const char *service,
1539                       const struct addrinfo *hints, struct addrinfo **res)
1540 {
1541         ensure_socket_initialization();
1542         return ipv6_getaddrinfo(node, service, hints, res);
1543 }
1544
1545 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1546                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1547                       int flags)
1548 {
1549         ensure_socket_initialization();
1550         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1551 }
1552
1553 int mingw_socket(int domain, int type, int protocol)
1554 {
1555         int sockfd;
1556         SOCKET s;
1557
1558         ensure_socket_initialization();
1559         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1560         if (s == INVALID_SOCKET) {
1561                 /*
1562                  * WSAGetLastError() values are regular BSD error codes
1563                  * biased by WSABASEERR.
1564                  * However, strerror() does not know about networking
1565                  * specific errors, which are values beginning at 38 or so.
1566                  * Therefore, we choose to leave the biased error code
1567                  * in errno so that _if_ someone looks up the code somewhere,
1568                  * then it is at least the number that are usually listed.
1569                  */
1570                 errno = WSAGetLastError();
1571                 return -1;
1572         }
1573         /* convert into a file descriptor */
1574         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1575                 closesocket(s);
1576                 return error("unable to make a socket file descriptor: %s",
1577                         strerror(errno));
1578         }
1579         return sockfd;
1580 }
1581
1582 #undef connect
1583 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1584 {
1585         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1586         return connect(s, sa, sz);
1587 }
1588
1589 #undef bind
1590 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1591 {
1592         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1593         return bind(s, sa, sz);
1594 }
1595
1596 #undef setsockopt
1597 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1598 {
1599         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1600         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1601 }
1602
1603 #undef shutdown
1604 int mingw_shutdown(int sockfd, int how)
1605 {
1606         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1607         return shutdown(s, how);
1608 }
1609
1610 #undef listen
1611 int mingw_listen(int sockfd, int backlog)
1612 {
1613         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1614         return listen(s, backlog);
1615 }
1616
1617 #undef accept
1618 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1619 {
1620         int sockfd2;
1621
1622         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1623         SOCKET s2 = accept(s1, sa, sz);
1624
1625         /* convert into a file descriptor */
1626         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1627                 int err = errno;
1628                 closesocket(s2);
1629                 return error("unable to make a socket file descriptor: %s",
1630                         strerror(err));
1631         }
1632         return sockfd2;
1633 }
1634
1635 #undef rename
1636 int mingw_rename(const char *pold, const char *pnew)
1637 {
1638         DWORD attrs, gle;
1639         int tries = 0;
1640         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1641         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1642                 return -1;
1643
1644         /*
1645          * Try native rename() first to get errno right.
1646          * It is based on MoveFile(), which cannot overwrite existing files.
1647          */
1648         if (!_wrename(wpold, wpnew))
1649                 return 0;
1650         if (errno != EEXIST)
1651                 return -1;
1652 repeat:
1653         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1654                 return 0;
1655         /* TODO: translate more errors */
1656         gle = GetLastError();
1657         if (gle == ERROR_ACCESS_DENIED &&
1658             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1659                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1660                         errno = EISDIR;
1661                         return -1;
1662                 }
1663                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1664                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1665                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1666                                 return 0;
1667                         gle = GetLastError();
1668                         /* revert file attributes on failure */
1669                         SetFileAttributesW(wpnew, attrs);
1670                 }
1671         }
1672         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1673                 /*
1674                  * We assume that some other process had the source or
1675                  * destination file open at the wrong moment and retry.
1676                  * In order to give the other process a higher chance to
1677                  * complete its operation, we give up our time slice now.
1678                  * If we have to retry again, we do sleep a bit.
1679                  */
1680                 Sleep(delay[tries]);
1681                 tries++;
1682                 goto repeat;
1683         }
1684         if (gle == ERROR_ACCESS_DENIED &&
1685                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1686                        "Should I try again?", pold, pnew))
1687                 goto repeat;
1688
1689         errno = EACCES;
1690         return -1;
1691 }
1692
1693 /*
1694  * Note that this doesn't return the actual pagesize, but
1695  * the allocation granularity. If future Windows specific git code
1696  * needs the real getpagesize function, we need to find another solution.
1697  */
1698 int mingw_getpagesize(void)
1699 {
1700         SYSTEM_INFO si;
1701         GetSystemInfo(&si);
1702         return si.dwAllocationGranularity;
1703 }
1704
1705 struct passwd *getpwuid(int uid)
1706 {
1707         static char user_name[100];
1708         static struct passwd p;
1709
1710         DWORD len = sizeof(user_name);
1711         if (!GetUserName(user_name, &len))
1712                 return NULL;
1713         p.pw_name = user_name;
1714         p.pw_gecos = "unknown";
1715         p.pw_dir = NULL;
1716         return &p;
1717 }
1718
1719 static HANDLE timer_event;
1720 static HANDLE timer_thread;
1721 static int timer_interval;
1722 static int one_shot;
1723 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1724
1725 /* The timer works like this:
1726  * The thread, ticktack(), is a trivial routine that most of the time
1727  * only waits to receive the signal to terminate. The main thread tells
1728  * the thread to terminate by setting the timer_event to the signalled
1729  * state.
1730  * But ticktack() interrupts the wait state after the timer's interval
1731  * length to call the signal handler.
1732  */
1733
1734 static unsigned __stdcall ticktack(void *dummy)
1735 {
1736         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1737                 mingw_raise(SIGALRM);
1738                 if (one_shot)
1739                         break;
1740         }
1741         return 0;
1742 }
1743
1744 static int start_timer_thread(void)
1745 {
1746         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1747         if (timer_event) {
1748                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1749                 if (!timer_thread )
1750                         return errno = ENOMEM,
1751                                 error("cannot start timer thread");
1752         } else
1753                 return errno = ENOMEM,
1754                         error("cannot allocate resources for timer");
1755         return 0;
1756 }
1757
1758 static void stop_timer_thread(void)
1759 {
1760         if (timer_event)
1761                 SetEvent(timer_event);  /* tell thread to terminate */
1762         if (timer_thread) {
1763                 int rc = WaitForSingleObject(timer_thread, 1000);
1764                 if (rc == WAIT_TIMEOUT)
1765                         error("timer thread did not terminate timely");
1766                 else if (rc != WAIT_OBJECT_0)
1767                         error("waiting for timer thread failed: %lu",
1768                               GetLastError());
1769                 CloseHandle(timer_thread);
1770         }
1771         if (timer_event)
1772                 CloseHandle(timer_event);
1773         timer_event = NULL;
1774         timer_thread = NULL;
1775 }
1776
1777 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1778 {
1779         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1780 }
1781
1782 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1783 {
1784         static const struct timeval zero;
1785         static int atexit_done;
1786
1787         if (out != NULL)
1788                 return errno = EINVAL,
1789                         error("setitimer param 3 != NULL not implemented");
1790         if (!is_timeval_eq(&in->it_interval, &zero) &&
1791             !is_timeval_eq(&in->it_interval, &in->it_value))
1792                 return errno = EINVAL,
1793                         error("setitimer: it_interval must be zero or eq it_value");
1794
1795         if (timer_thread)
1796                 stop_timer_thread();
1797
1798         if (is_timeval_eq(&in->it_value, &zero) &&
1799             is_timeval_eq(&in->it_interval, &zero))
1800                 return 0;
1801
1802         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1803         one_shot = is_timeval_eq(&in->it_interval, &zero);
1804         if (!atexit_done) {
1805                 atexit(stop_timer_thread);
1806                 atexit_done = 1;
1807         }
1808         return start_timer_thread();
1809 }
1810
1811 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1812 {
1813         if (sig != SIGALRM)
1814                 return errno = EINVAL,
1815                         error("sigaction only implemented for SIGALRM");
1816         if (out != NULL)
1817                 return errno = EINVAL,
1818                         error("sigaction: param 3 != NULL not implemented");
1819
1820         timer_fn = in->sa_handler;
1821         return 0;
1822 }
1823
1824 #undef signal
1825 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1826 {
1827         sig_handler_t old;
1828
1829         switch (sig) {
1830         case SIGALRM:
1831                 old = timer_fn;
1832                 timer_fn = handler;
1833                 break;
1834
1835         case SIGINT:
1836                 old = sigint_fn;
1837                 sigint_fn = handler;
1838                 break;
1839
1840         default:
1841                 return signal(sig, handler);
1842         }
1843
1844         return old;
1845 }
1846
1847 #undef raise
1848 int mingw_raise(int sig)
1849 {
1850         switch (sig) {
1851         case SIGALRM:
1852                 if (timer_fn == SIG_DFL) {
1853                         if (isatty(STDERR_FILENO))
1854                                 fputs("Alarm clock\n", stderr);
1855                         exit(128 + SIGALRM);
1856                 } else if (timer_fn != SIG_IGN)
1857                         timer_fn(SIGALRM);
1858                 return 0;
1859
1860         case SIGINT:
1861                 if (sigint_fn == SIG_DFL)
1862                         exit(128 + SIGINT);
1863                 else if (sigint_fn != SIG_IGN)
1864                         sigint_fn(SIGINT);
1865                 return 0;
1866
1867         default:
1868                 return raise(sig);
1869         }
1870 }
1871
1872
1873 static const char *make_backslash_path(const char *path)
1874 {
1875         static char buf[PATH_MAX + 1];
1876         char *c;
1877
1878         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1879                 die("Too long path: %.*s", 60, path);
1880
1881         for (c = buf; *c; c++) {
1882                 if (*c == '/')
1883                         *c = '\\';
1884         }
1885         return buf;
1886 }
1887
1888 void mingw_open_html(const char *unixpath)
1889 {
1890         const char *htmlpath = make_backslash_path(unixpath);
1891         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1892                         const char *, const char *, const char *, INT);
1893         T ShellExecute;
1894         HMODULE shell32;
1895         int r;
1896
1897         shell32 = LoadLibrary("shell32.dll");
1898         if (!shell32)
1899                 die("cannot load shell32.dll");
1900         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1901         if (!ShellExecute)
1902                 die("cannot run browser");
1903
1904         printf("Launching default browser to display HTML ...\n");
1905         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1906         FreeLibrary(shell32);
1907         /* see the MSDN documentation referring to the result codes here */
1908         if (r <= 32) {
1909                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1910         }
1911 }
1912
1913 int link(const char *oldpath, const char *newpath)
1914 {
1915         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1916         static T create_hard_link = NULL;
1917         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1918         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1919                 xutftowcs_path(wnewpath, newpath) < 0)
1920                 return -1;
1921
1922         if (!create_hard_link) {
1923                 create_hard_link = (T) GetProcAddress(
1924                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1925                 if (!create_hard_link)
1926                         create_hard_link = (T)-1;
1927         }
1928         if (create_hard_link == (T)-1) {
1929                 errno = ENOSYS;
1930                 return -1;
1931         }
1932         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1933                 errno = err_win_to_posix(GetLastError());
1934                 return -1;
1935         }
1936         return 0;
1937 }
1938
1939 pid_t waitpid(pid_t pid, int *status, int options)
1940 {
1941         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1942             FALSE, pid);
1943         if (!h) {
1944                 errno = ECHILD;
1945                 return -1;
1946         }
1947
1948         if (pid > 0 && options & WNOHANG) {
1949                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1950                         CloseHandle(h);
1951                         return 0;
1952                 }
1953                 options &= ~WNOHANG;
1954         }
1955
1956         if (options == 0) {
1957                 struct pinfo_t **ppinfo;
1958                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1959                         CloseHandle(h);
1960                         return 0;
1961                 }
1962
1963                 if (status)
1964                         GetExitCodeProcess(h, (LPDWORD)status);
1965
1966                 EnterCriticalSection(&pinfo_cs);
1967
1968                 ppinfo = &pinfo;
1969                 while (*ppinfo) {
1970                         struct pinfo_t *info = *ppinfo;
1971                         if (info->pid == pid) {
1972                                 CloseHandle(info->proc);
1973                                 *ppinfo = info->next;
1974                                 free(info);
1975                                 break;
1976                         }
1977                         ppinfo = &info->next;
1978                 }
1979
1980                 LeaveCriticalSection(&pinfo_cs);
1981
1982                 CloseHandle(h);
1983                 return pid;
1984         }
1985         CloseHandle(h);
1986
1987         errno = EINVAL;
1988         return -1;
1989 }
1990
1991 const char *get_windows_home_directory(void)
1992 {
1993         static const char *home_directory = NULL;
1994         struct strbuf buf = STRBUF_INIT;
1995
1996         if (home_directory)
1997                 return home_directory;
1998
1999         home_directory = getenv("HOME");
2000         if (home_directory && *home_directory)
2001                 return home_directory;
2002
2003         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
2004         home_directory = strbuf_detach(&buf, NULL);
2005
2006         return home_directory;
2007 }
2008
2009 int mingw_offset_1st_component(const char *path)
2010 {
2011         int offset = 0;
2012         if (has_dos_drive_prefix(path))
2013                 offset = 2;
2014
2015         /* unc paths */
2016         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
2017
2018                 /* skip server name */
2019                 char *pos = strpbrk(path + 2, "\\/");
2020                 if (!pos)
2021                         return 0; /* Error: malformed unc path */
2022
2023                 do {
2024                         pos++;
2025                 } while (*pos && !is_dir_sep(*pos));
2026
2027                 offset = pos - path;
2028         }
2029
2030         return offset + is_dir_sep(path[offset]);
2031 }
2032
2033 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2034 {
2035         int upos = 0, wpos = 0;
2036         const unsigned char *utf = (const unsigned char*) utfs;
2037         if (!utf || !wcs || wcslen < 1) {
2038                 errno = EINVAL;
2039                 return -1;
2040         }
2041         /* reserve space for \0 */
2042         wcslen--;
2043         if (utflen < 0)
2044                 utflen = INT_MAX;
2045
2046         while (upos < utflen) {
2047                 int c = utf[upos++] & 0xff;
2048                 if (utflen == INT_MAX && c == 0)
2049                         break;
2050
2051                 if (wpos >= wcslen) {
2052                         wcs[wpos] = 0;
2053                         errno = ERANGE;
2054                         return -1;
2055                 }
2056
2057                 if (c < 0x80) {
2058                         /* ASCII */
2059                         wcs[wpos++] = c;
2060                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2061                                 (utf[upos] & 0xc0) == 0x80) {
2062                         /* 2-byte utf-8 */
2063                         c = ((c & 0x1f) << 6);
2064                         c |= (utf[upos++] & 0x3f);
2065                         wcs[wpos++] = c;
2066                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2067                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2068                                 (utf[upos] & 0xc0) == 0x80 &&
2069                                 (utf[upos + 1] & 0xc0) == 0x80) {
2070                         /* 3-byte utf-8 */
2071                         c = ((c & 0x0f) << 12);
2072                         c |= ((utf[upos++] & 0x3f) << 6);
2073                         c |= (utf[upos++] & 0x3f);
2074                         wcs[wpos++] = c;
2075                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2076                                 wpos + 1 < wcslen &&
2077                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2078                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2079                                 (utf[upos] & 0xc0) == 0x80 &&
2080                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2081                                 (utf[upos + 2] & 0xc0) == 0x80) {
2082                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2083                         c = ((c & 0x07) << 18);
2084                         c |= ((utf[upos++] & 0x3f) << 12);
2085                         c |= ((utf[upos++] & 0x3f) << 6);
2086                         c |= (utf[upos++] & 0x3f);
2087                         c -= 0x10000;
2088                         wcs[wpos++] = 0xd800 | (c >> 10);
2089                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2090                 } else if (c >= 0xa0) {
2091                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2092                         wcs[wpos++] = c;
2093                 } else {
2094                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2095                         static const char *hex = "0123456789abcdef";
2096                         wcs[wpos++] = hex[c >> 4];
2097                         if (wpos < wcslen)
2098                                 wcs[wpos++] = hex[c & 0x0f];
2099                 }
2100         }
2101         wcs[wpos] = 0;
2102         return wpos;
2103 }
2104
2105 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2106 {
2107         if (!wcs || !utf || utflen < 1) {
2108                 errno = EINVAL;
2109                 return -1;
2110         }
2111         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2112         if (utflen)
2113                 return utflen - 1;
2114         errno = ERANGE;
2115         return -1;
2116 }
2117
2118 /*
2119  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2120  * mingw startup code, see init.c in mingw runtime).
2121  */
2122 int _CRT_glob = 0;
2123
2124 typedef struct {
2125         int newmode;
2126 } _startupinfo;
2127
2128 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2129                 _startupinfo *si);
2130
2131 void mingw_startup()
2132 {
2133         int i, len, maxlen, argc;
2134         char *buffer;
2135         wchar_t **wenv, **wargv;
2136         _startupinfo si;
2137
2138         /* get wide char arguments and environment */
2139         si.newmode = 0;
2140         __wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si);
2141
2142         /* determine size of argv and environ conversion buffer */
2143         maxlen = wcslen(_wpgmptr);
2144         for (i = 1; i < argc; i++)
2145                 maxlen = max(maxlen, wcslen(wargv[i]));
2146
2147         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2148         maxlen = 3 * maxlen + 1;
2149         buffer = xmalloc(maxlen);
2150
2151         /* convert command line arguments and environment to UTF-8 */
2152         len = xwcstoutf(buffer, _wpgmptr, maxlen);
2153         __argv[0] = xmemdupz(buffer, len);
2154         for (i = 1; i < argc; i++) {
2155                 len = xwcstoutf(buffer, wargv[i], maxlen);
2156                 __argv[i] = xmemdupz(buffer, len);
2157         }
2158         free(buffer);
2159
2160         /* initialize critical section for waitpid pinfo_t list */
2161         InitializeCriticalSection(&pinfo_cs);
2162
2163         /* set up default file mode and file modes for stdin/out/err */
2164         _fmode = _O_BINARY;
2165         _setmode(_fileno(stdin), _O_BINARY);
2166         _setmode(_fileno(stdout), _O_BINARY);
2167         _setmode(_fileno(stderr), _O_BINARY);
2168
2169         /* initialize Unicode console */
2170         winansi_init();
2171 }