compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <wchar.h>
   4 #include "../strbuf.h"
   5 #include "../run-command.h"
   6 #include "../cache.h"
   7
   8 static const int delay[] = { 0, 1, 10, 20, 40 };
   9 unsigned int _CRT_fmode = _O_BINARY;
  10
  11 int err_win_to_posix(DWORD winerr)
  12 {
  13         int error = ENOSYS;
  14         switch(winerr) {
  15         case ERROR_ACCESS_DENIED: error = EACCES; break;
  16         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  17         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  18         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  19         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  20         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  21         case ERROR_BAD_COMMAND: error = EIO; break;
  22         case ERROR_BAD_DEVICE: error = ENODEV; break;
  23         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  24         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  25         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_LENGTH: error = EINVAL; break;
  27         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  28         case ERROR_BAD_PIPE: error = EPIPE; break;
  29         case ERROR_BAD_UNIT: error = ENODEV; break;
  30         case ERROR_BAD_USERNAME: error = EINVAL; break;
  31         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  32         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  33         case ERROR_BUSY: error = EBUSY; break;
  34         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  35         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  36         case ERROR_CANNOT_MAKE: error = EACCES; break;
  37         case ERROR_CANTOPEN: error = EIO; break;
  38         case ERROR_CANTREAD: error = EIO; break;
  39         case ERROR_CANTWRITE: error = EIO; break;
  40         case ERROR_CRC: error = EIO; break;
  41         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  42         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  43         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  44         case ERROR_DIRECTORY: error = EINVAL; break;
  45         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  46         case ERROR_DISK_CHANGE: error = EIO; break;
  47         case ERROR_DISK_FULL: error = ENOSPC; break;
  48         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  49         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  50         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  51         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  52         case ERROR_FILE_EXISTS: error = EEXIST; break;
  53         case ERROR_FILE_INVALID: error = ENODEV; break;
  54         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  55         case ERROR_GEN_FAILURE: error = EIO; break;
  56         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  57         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  58         case ERROR_INVALID_ACCESS: error = EACCES; break;
  59         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  60         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  61         case ERROR_INVALID_DATA: error = EINVAL; break;
  62         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  63         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  64         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  65         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  66         case ERROR_INVALID_HANDLE: error = EBADF; break;
  67         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  68         case ERROR_INVALID_NAME: error = EINVAL; break;
  69         case ERROR_INVALID_OWNER: error = EINVAL; break;
  70         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  71         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  72         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  73         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  74         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  75         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  76         case ERROR_IO_DEVICE: error = EIO; break;
  77         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  78         case ERROR_LOCKED: error = EBUSY; break;
  79         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  80         case ERROR_LOGON_FAILURE: error = EACCES; break;
  81         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  82         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  83         case ERROR_MORE_DATA: error = EPIPE; break;
  84         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  85         case ERROR_NOACCESS: error = EFAULT; break;
  86         case ERROR_NONE_MAPPED: error = EINVAL; break;
  87         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  88         case ERROR_NOT_READY: error = EAGAIN; break;
  89         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  90         case ERROR_NO_DATA: error = EPIPE; break;
  91         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  92         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  93         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  94         case ERROR_OPEN_FAILED: error = EIO; break;
  95         case ERROR_OPEN_FILES: error = EBUSY; break;
  96         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  97         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  98         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  99         case ERROR_PATH_BUSY: error = EBUSY; break;
 100         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 101         case ERROR_PIPE_BUSY: error = EBUSY; break;
 102         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 103         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 104         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 105         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 106         case ERROR_READ_FAULT: error = EIO; break;
 107         case ERROR_SEEK: error = EIO; break;
 108         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 109         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 110         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 111         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 112         case ERROR_SWAPERROR: error = ENOENT; break;
 113         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 114         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 115         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 116         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 117         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 118         case ERROR_WRITE_FAULT: error = EIO; break;
 119         case ERROR_WRITE_PROTECT: error = EROFS; break;
 120         }
 121         return error;
 122 }
 123
 124 static inline int is_file_in_use_error(DWORD errcode)
 125 {
 126         switch (errcode) {
 127         case ERROR_SHARING_VIOLATION:
 128         case ERROR_ACCESS_DENIED:
 129                 return 1;
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int read_yes_no_answer(void)
 136 {
 137         char answer[1024];
 138
 139         if (fgets(answer, sizeof(answer), stdin)) {
 140                 size_t answer_len = strlen(answer);
 141                 int got_full_line = 0, c;
 142
 143                 /* remove the newline */
 144                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 145                         answer[answer_len-2] = '\0';
 146                         got_full_line = 1;
 147                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 148                         answer[answer_len-1] = '\0';
 149                         got_full_line = 1;
 150                 }
 151                 /* flush the buffer in case we did not get the full line */
 152                 if (!got_full_line)
 153                         while ((c = getchar()) != EOF && c != '\n')
 154                                 ;
 155         } else
 156                 /* we could not read, return the
 157                  * default answer which is no */
 158                 return 0;
 159
 160         if (tolower(answer[0]) == 'y' && !answer[1])
 161                 return 1;
 162         if (!strncasecmp(answer, "yes", sizeof(answer)))
 163                 return 1;
 164         if (tolower(answer[0]) == 'n' && !answer[1])
 165                 return 0;
 166         if (!strncasecmp(answer, "no", sizeof(answer)))
 167                 return 0;
 168
 169         /* did not find an answer we understand */
 170         return -1;
 171 }
 172
 173 static int ask_yes_no_if_possible(const char *format, ...)
 174 {
 175         char question[4096];
 176         const char *retry_hook[] = { NULL, NULL, NULL };
 177         va_list args;
 178
 179         va_start(args, format);
 180         vsnprintf(question, sizeof(question), format, args);
 181         va_end(args);
 182
 183         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 184                 retry_hook[1] = question;
 185                 return !run_command_v_opt(retry_hook, 0);
 186         }
 187
 188         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 189                 return 0;
 190
 191         while (1) {
 192                 int answer;
 193                 fprintf(stderr, "%s (y/n) ", question);
 194
 195                 if ((answer = read_yes_no_answer()) >= 0)
 196                         return answer;
 197
 198                 fprintf(stderr, "Sorry, I did not understand your answer. "
 199                                 "Please type 'y' or 'n'\n");
 200         }
 201 }
 202
 203 int mingw_unlink(const char *pathname)
 204 {
 205         int ret, tries = 0;
 206         wchar_t wpathname[MAX_PATH];
 207         if (xutftowcs_path(wpathname, pathname) < 0)
 208                 return -1;
 209
 210         /* read-only files cannot be removed */
 211         _wchmod(wpathname, 0666);
 212         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 213                 if (!is_file_in_use_error(GetLastError()))
 214                         break;
 215                 /*
 216                  * We assume that some other process had the source or
 217                  * destination file open at the wrong moment and retry.
 218                  * In order to give the other process a higher chance to
 219                  * complete its operation, we give up our time slice now.
 220                  * If we have to retry again, we do sleep a bit.
 221                  */
 222                 Sleep(delay[tries]);
 223                 tries++;
 224         }
 225         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 226                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 227                         "Should I try again?", pathname))
 228                ret = _wunlink(wpathname);
 229         return ret;
 230 }
 231
 232 static int is_dir_empty(const wchar_t *wpath)
 233 {
 234         WIN32_FIND_DATAW findbuf;
 235         HANDLE handle;
 236         wchar_t wbuf[MAX_PATH + 2];
 237         wcscpy(wbuf, wpath);
 238         wcscat(wbuf, L"\\*");
 239         handle = FindFirstFileW(wbuf, &findbuf);
 240         if (handle == INVALID_HANDLE_VALUE)
 241                 return GetLastError() == ERROR_NO_MORE_FILES;
 242
 243         while (!wcscmp(findbuf.cFileName, L".") ||
 244                         !wcscmp(findbuf.cFileName, L".."))
 245                 if (!FindNextFileW(handle, &findbuf)) {
 246                         DWORD err = GetLastError();
 247                         FindClose(handle);
 248                         return err == ERROR_NO_MORE_FILES;
 249                 }
 250         FindClose(handle);
 251         return 0;
 252 }
 253
 254 int mingw_rmdir(const char *pathname)
 255 {
 256         int ret, tries = 0;
 257         wchar_t wpathname[MAX_PATH];
 258         if (xutftowcs_path(wpathname, pathname) < 0)
 259                 return -1;
 260
 261         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 262                 if (!is_file_in_use_error(GetLastError()))
 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 && 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 FILE *mingw_fopen (const char *filename, const char *otype)
 381 {
 382         int hide = 0;
 383         FILE *file;
 384         wchar_t wfilename[MAX_PATH], wotype[4];
 385         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 386             basename((char*)filename)[0] == '.')
 387                 hide = access(filename, F_OK);
 388         if (filename && !strcmp(filename, "/dev/null"))
 389                 filename = "nul";
 390         if (xutftowcs_path(wfilename, filename) < 0 ||
 391                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 392                 return NULL;
 393         file = _wfopen(wfilename, wotype);
 394         if (file && hide && make_hidden(wfilename))
 395                 warning("Could not mark '%s' as hidden.", filename);
 396         return file;
 397 }
 398
 399 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 400 {
 401         int hide = 0;
 402         FILE *file;
 403         wchar_t wfilename[MAX_PATH], wotype[4];
 404         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 405             basename((char*)filename)[0] == '.')
 406                 hide = access(filename, F_OK);
 407         if (filename && !strcmp(filename, "/dev/null"))
 408                 filename = "nul";
 409         if (xutftowcs_path(wfilename, filename) < 0 ||
 410                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 411                 return NULL;
 412         file = _wfreopen(wfilename, wotype, stream);
 413         if (file && hide && make_hidden(wfilename))
 414                 warning("Could not mark '%s' as hidden.", filename);
 415         return file;
 416 }
 417
 418 int mingw_access(const char *filename, int mode)
 419 {
 420         wchar_t wfilename[MAX_PATH];
 421         if (xutftowcs_path(wfilename, filename) < 0)
 422                 return -1;
 423         /* X_OK is not supported by the MSVCRT version */
 424         return _waccess(wfilename, mode & ~X_OK);
 425 }
 426
 427 int mingw_chdir(const char *dirname)
 428 {
 429         wchar_t wdirname[MAX_PATH];
 430         if (xutftowcs_path(wdirname, dirname) < 0)
 431                 return -1;
 432         return _wchdir(wdirname);
 433 }
 434
 435 int mingw_chmod(const char *filename, int mode)
 436 {
 437         wchar_t wfilename[MAX_PATH];
 438         if (xutftowcs_path(wfilename, filename) < 0)
 439                 return -1;
 440         return _wchmod(wfilename, mode);
 441 }
 442
 443 /*
 444  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 445  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 446  */
 447 static inline long long filetime_to_hnsec(const FILETIME *ft)
 448 {
 449         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 450         /* Windows to Unix Epoch conversion */
 451         return winTime - 116444736000000000LL;
 452 }
 453
 454 static inline time_t filetime_to_time_t(const FILETIME *ft)
 455 {
 456         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 457 }
 458
 459 /* We keep the do_lstat code in a separate function to avoid recursion.
 460  * When a path ends with a slash, the stat will fail with ENOENT. In
 461  * this case, we strip the trailing slashes and stat again.
 462  *
 463  * If follow is true then act like stat() and report on the link
 464  * target. Otherwise report on the link itself.
 465  */
 466 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 467 {
 468         WIN32_FILE_ATTRIBUTE_DATA fdata;
 469         wchar_t wfilename[MAX_PATH];
 470         if (xutftowcs_path(wfilename, file_name) < 0)
 471                 return -1;
 472
 473         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 474                 buf->st_ino = 0;
 475                 buf->st_gid = 0;
 476                 buf->st_uid = 0;
 477                 buf->st_nlink = 1;
 478                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 479                 buf->st_size = fdata.nFileSizeLow |
 480                         (((off_t)fdata.nFileSizeHigh)<<32);
 481                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 482                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 483                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 484                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 485                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 486                         WIN32_FIND_DATAW findbuf;
 487                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 488                         if (handle != INVALID_HANDLE_VALUE) {
 489                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 490                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 491                                         if (follow) {
 492                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 493                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 494                                         } else {
 495                                                 buf->st_mode = S_IFLNK;
 496                                         }
 497                                         buf->st_mode |= S_IREAD;
 498                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 499                                                 buf->st_mode |= S_IWRITE;
 500                                 }
 501                                 FindClose(handle);
 502                         }
 503                 }
 504                 return 0;
 505         }
 506         switch (GetLastError()) {
 507         case ERROR_ACCESS_DENIED:
 508         case ERROR_SHARING_VIOLATION:
 509         case ERROR_LOCK_VIOLATION:
 510         case ERROR_SHARING_BUFFER_EXCEEDED:
 511                 errno = EACCES;
 512                 break;
 513         case ERROR_BUFFER_OVERFLOW:
 514                 errno = ENAMETOOLONG;
 515                 break;
 516         case ERROR_NOT_ENOUGH_MEMORY:
 517                 errno = ENOMEM;
 518                 break;
 519         default:
 520                 errno = ENOENT;
 521                 break;
 522         }
 523         return -1;
 524 }
 525
 526 /* We provide our own lstat/fstat functions, since the provided
 527  * lstat/fstat functions are so slow. These stat functions are
 528  * tailored for Git's usage (read: fast), and are not meant to be
 529  * complete. Note that Git stat()s are redirected to mingw_lstat()
 530  * too, since Windows doesn't really handle symlinks that well.
 531  */
 532 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 533 {
 534         int namelen;
 535         char alt_name[PATH_MAX];
 536
 537         if (!do_lstat(follow, file_name, buf))
 538                 return 0;
 539
 540         /* if file_name ended in a '/', Windows returned ENOENT;
 541          * try again without trailing slashes
 542          */
 543         if (errno != ENOENT)
 544                 return -1;
 545
 546         namelen = strlen(file_name);
 547         if (namelen && file_name[namelen-1] != '/')
 548                 return -1;
 549         while (namelen && file_name[namelen-1] == '/')
 550                 --namelen;
 551         if (!namelen || namelen >= PATH_MAX)
 552                 return -1;
 553
 554         memcpy(alt_name, file_name, namelen);
 555         alt_name[namelen] = 0;
 556         return do_lstat(follow, alt_name, buf);
 557 }
 558
 559 int mingw_lstat(const char *file_name, struct stat *buf)
 560 {
 561         return do_stat_internal(0, file_name, buf);
 562 }
 563 int mingw_stat(const char *file_name, struct stat *buf)
 564 {
 565         return do_stat_internal(1, file_name, buf);
 566 }
 567
 568 #undef fstat
 569 int mingw_fstat(int fd, struct stat *buf)
 570 {
 571         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 572         BY_HANDLE_FILE_INFORMATION fdata;
 573
 574         if (fh == INVALID_HANDLE_VALUE) {
 575                 errno = EBADF;
 576                 return -1;
 577         }
 578         /* direct non-file handles to MS's fstat() */
 579         if (GetFileType(fh) != FILE_TYPE_DISK)
 580                 return _fstati64(fd, buf);
 581
 582         if (GetFileInformationByHandle(fh, &fdata)) {
 583                 buf->st_ino = 0;
 584                 buf->st_gid = 0;
 585                 buf->st_uid = 0;
 586                 buf->st_nlink = 1;
 587                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 588                 buf->st_size = fdata.nFileSizeLow |
 589                         (((off_t)fdata.nFileSizeHigh)<<32);
 590                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 591                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 592                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 593                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 594                 return 0;
 595         }
 596         errno = EBADF;
 597         return -1;
 598 }
 599
 600 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 601 {
 602         long long winTime = t * 10000000LL + 116444736000000000LL;
 603         ft->dwLowDateTime = winTime;
 604         ft->dwHighDateTime = winTime >> 32;
 605 }
 606
 607 int mingw_utime (const char *file_name, const struct utimbuf *times)
 608 {
 609         FILETIME mft, aft;
 610         int fh, rc;
 611         DWORD attrs;
 612         wchar_t wfilename[MAX_PATH];
 613         if (xutftowcs_path(wfilename, file_name) < 0)
 614                 return -1;
 615
 616         /* must have write permission */
 617         attrs = GetFileAttributesW(wfilename);
 618         if (attrs != INVALID_FILE_ATTRIBUTES &&
 619             (attrs & FILE_ATTRIBUTE_READONLY)) {
 620                 /* ignore errors here; open() will report them */
 621                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 622         }
 623
 624         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 625                 rc = -1;
 626                 goto revert_attrs;
 627         }
 628
 629         if (times) {
 630                 time_t_to_filetime(times->modtime, &mft);
 631                 time_t_to_filetime(times->actime, &aft);
 632         } else {
 633                 GetSystemTimeAsFileTime(&mft);
 634                 aft = mft;
 635         }
 636         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 637                 errno = EINVAL;
 638                 rc = -1;
 639         } else
 640                 rc = 0;
 641         close(fh);
 642
 643 revert_attrs:
 644         if (attrs != INVALID_FILE_ATTRIBUTES &&
 645             (attrs & FILE_ATTRIBUTE_READONLY)) {
 646                 /* ignore errors again */
 647                 SetFileAttributesW(wfilename, attrs);
 648         }
 649         return rc;
 650 }
 651
 652 unsigned int sleep (unsigned int seconds)
 653 {
 654         Sleep(seconds*1000);
 655         return 0;
 656 }
 657
 658 char *mingw_mktemp(char *template)
 659 {
 660         wchar_t wtemplate[MAX_PATH];
 661         if (xutftowcs_path(wtemplate, template) < 0)
 662                 return NULL;
 663         if (!_wmktemp(wtemplate))
 664                 return NULL;
 665         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 666                 return NULL;
 667         return template;
 668 }
 669
 670 int mkstemp(char *template)
 671 {
 672         char *filename = mktemp(template);
 673         if (filename == NULL)
 674                 return -1;
 675         return open(filename, O_RDWR | O_CREAT, 0600);
 676 }
 677
 678 int gettimeofday(struct timeval *tv, void *tz)
 679 {
 680         FILETIME ft;
 681         long long hnsec;
 682
 683         GetSystemTimeAsFileTime(&ft);
 684         hnsec = filetime_to_hnsec(&ft);
 685         tv->tv_sec = hnsec / 10000000;
 686         tv->tv_usec = (hnsec % 10000000) / 10;
 687         return 0;
 688 }
 689
 690 int pipe(int filedes[2])
 691 {
 692         HANDLE h[2];
 693
 694         /* this creates non-inheritable handles */
 695         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 696                 errno = err_win_to_posix(GetLastError());
 697                 return -1;
 698         }
 699         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 700         if (filedes[0] < 0) {
 701                 CloseHandle(h[0]);
 702                 CloseHandle(h[1]);
 703                 return -1;
 704         }
 705         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 706         if (filedes[0] < 0) {
 707                 close(filedes[0]);
 708                 CloseHandle(h[1]);
 709                 return -1;
 710         }
 711         return 0;
 712 }
 713
 714 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 715 {
 716         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 717         memcpy(result, gmtime(timep), sizeof(struct tm));
 718         return result;
 719 }
 720
 721 struct tm *localtime_r(const time_t *timep, struct tm *result)
 722 {
 723         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 724         memcpy(result, localtime(timep), sizeof(struct tm));
 725         return result;
 726 }
 727
 728 char *mingw_getcwd(char *pointer, int len)
 729 {
 730         int i;
 731         wchar_t wpointer[MAX_PATH];
 732         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 733                 return NULL;
 734         if (xwcstoutf(pointer, wpointer, len) < 0)
 735                 return NULL;
 736         for (i = 0; pointer[i]; i++)
 737                 if (pointer[i] == '\\')
 738                         pointer[i] = '/';
 739         return pointer;
 740 }
 741
 742 /*
 743  * Compare environment entries by key (i.e. stopping at '=' or '\0').
 744  */
 745 static int compareenv(const void *v1, const void *v2)
 746 {
 747         const char *e1 = *(const char**)v1;
 748         const char *e2 = *(const char**)v2;
 749
 750         for (;;) {
 751                 int c1 = *e1++;
 752                 int c2 = *e2++;
 753                 c1 = (c1 == '=') ? 0 : tolower(c1);
 754                 c2 = (c2 == '=') ? 0 : tolower(c2);
 755                 if (c1 > c2)
 756                         return 1;
 757                 if (c1 < c2)
 758                         return -1;
 759                 if (c1 == 0)
 760                         return 0;
 761         }
 762 }
 763
 764 static int bsearchenv(char **env, const char *name, size_t size)
 765 {
 766         unsigned low = 0, high = size;
 767         while (low < high) {
 768                 unsigned mid = low + ((high - low) >> 1);
 769                 int cmp = compareenv(&env[mid], &name);
 770                 if (cmp < 0)
 771                         low = mid + 1;
 772                 else if (cmp > 0)
 773                         high = mid;
 774                 else
 775                         return mid;
 776         }
 777         return ~low; /* not found, return 1's complement of insert position */
 778 }
 779
 780 /*
 781  * If name contains '=', then sets the variable, otherwise it unsets it
 782  * Size includes the terminating NULL. Env must have room for size + 1 entries
 783  * (in case of insert). Returns the new size. Optionally frees removed entries.
 784  */
 785 static int do_putenv(char **env, const char *name, int size, int free_old)
 786 {
 787         int i = bsearchenv(env, name, size - 1);
 788
 789         /* optionally free removed / replaced entry */
 790         if (i >= 0 && free_old)
 791                 free(env[i]);
 792
 793         if (strchr(name, '=')) {
 794                 /* if new value ('key=value') is specified, insert or replace entry */
 795                 if (i < 0) {
 796                         i = ~i;
 797                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
 798                         size++;
 799                 }
 800                 env[i] = (char*) name;
 801         } else if (i >= 0) {
 802                 /* otherwise ('key') remove existing entry */
 803                 size--;
 804                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
 805         }
 806         return size;
 807 }
 808
 809 /* used number of elements of environ array, including terminating NULL */
 810 static int environ_size = 0;
 811 /* allocated size of environ array, in bytes */
 812 static int environ_alloc = 0;
 813
 814 char *mingw_getenv(const char *name)
 815 {
 816         char *value;
 817         int pos = bsearchenv(environ, name, environ_size - 1);
 818         if (pos < 0)
 819                 return NULL;
 820         value = strchr(environ[pos], '=');
 821         return value ? &value[1] : NULL;
 822 }
 823
 824 int mingw_putenv(const char *namevalue)
 825 {
 826         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
 827         environ_size = do_putenv(environ, namevalue, environ_size, 1);
 828         return 0;
 829 }
 830
 831 /*
 832  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 833  * (Parsing C++ Command-Line Arguments)
 834  */
 835 static const char *quote_arg(const char *arg)
 836 {
 837         /* count chars to quote */
 838         int len = 0, n = 0;
 839         int force_quotes = 0;
 840         char *q, *d;
 841         const char *p = arg;
 842         if (!*p) force_quotes = 1;
 843         while (*p) {
 844                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 845                         force_quotes = 1;
 846                 else if (*p == '"')
 847                         n++;
 848                 else if (*p == '\\') {
 849                         int count = 0;
 850                         while (*p == '\\') {
 851                                 count++;
 852                                 p++;
 853                                 len++;
 854                         }
 855                         if (*p == '"')
 856                                 n += count*2 + 1;
 857                         continue;
 858                 }
 859                 len++;
 860                 p++;
 861         }
 862         if (!force_quotes && n == 0)
 863                 return arg;
 864
 865         /* insert \ where necessary */
 866         d = q = xmalloc(len+n+3);
 867         *d++ = '"';
 868         while (*arg) {
 869                 if (*arg == '"')
 870                         *d++ = '\\';
 871                 else if (*arg == '\\') {
 872                         int count = 0;
 873                         while (*arg == '\\') {
 874                                 count++;
 875                                 *d++ = *arg++;
 876                         }
 877                         if (*arg == '"') {
 878                                 while (count-- > 0)
 879                                         *d++ = '\\';
 880                                 *d++ = '\\';
 881                         }
 882                 }
 883                 *d++ = *arg++;
 884         }
 885         *d++ = '"';
 886         *d++ = 0;
 887         return q;
 888 }
 889
 890 static const char *parse_interpreter(const char *cmd)
 891 {
 892         static char buf[100];
 893         char *p, *opt;
 894         int n, fd;
 895
 896         /* don't even try a .exe */
 897         n = strlen(cmd);
 898         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 899                 return NULL;
 900
 901         fd = open(cmd, O_RDONLY);
 902         if (fd < 0)
 903                 return NULL;
 904         n = read(fd, buf, sizeof(buf)-1);
 905         close(fd);
 906         if (n < 4)      /* at least '#!/x' and not error */
 907                 return NULL;
 908
 909         if (buf[0] != '#' || buf[1] != '!')
 910                 return NULL;
 911         buf[n] = '\0';
 912         p = buf + strcspn(buf, "\r\n");
 913         if (!*p)
 914                 return NULL;
 915
 916         *p = '\0';
 917         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 918                 return NULL;
 919         /* strip options */
 920         if ((opt = strchr(p+1, ' ')))
 921                 *opt = '\0';
 922         return p+1;
 923 }
 924
 925 /*
 926  * Splits the PATH into parts.
 927  */
 928 static char **get_path_split(void)
 929 {
 930         char *p, **path, *envpath = getenv("PATH");
 931         int i, n = 0;
 932
 933         if (!envpath || !*envpath)
 934                 return NULL;
 935
 936         envpath = xstrdup(envpath);
 937         p = envpath;
 938         while (p) {
 939                 char *dir = p;
 940                 p = strchr(p, ';');
 941                 if (p) *p++ = '\0';
 942                 if (*dir) {     /* not earlier, catches series of ; */
 943                         ++n;
 944                 }
 945         }
 946         if (!n)
 947                 return NULL;
 948
 949         path = xmalloc((n+1)*sizeof(char *));
 950         p = envpath;
 951         i = 0;
 952         do {
 953                 if (*p)
 954                         path[i++] = xstrdup(p);
 955                 p = p+strlen(p)+1;
 956         } while (i < n);
 957         path[i] = NULL;
 958
 959         free(envpath);
 960
 961         return path;
 962 }
 963
 964 static void free_path_split(char **path)
 965 {
 966         char **p = path;
 967
 968         if (!path)
 969                 return;
 970
 971         while (*p)
 972                 free(*p++);
 973         free(path);
 974 }
 975
 976 /*
 977  * exe_only means that we only want to detect .exe files, but not scripts
 978  * (which do not have an extension)
 979  */
 980 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 981 {
 982         char path[MAX_PATH];
 983         wchar_t wpath[MAX_PATH];
 984         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 985
 986         if (xutftowcs_path(wpath, path) < 0)
 987                 return NULL;
 988
 989         if (!isexe && _waccess(wpath, F_OK) == 0)
 990                 return xstrdup(path);
 991         wpath[wcslen(wpath)-4] = '\0';
 992         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
 993                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
 994                         path[strlen(path)-4] = '\0';
 995                         return xstrdup(path);
 996                 }
 997         }
 998         return NULL;
 999 }
1000
1001 /*
1002  * Determines the absolute path of cmd using the split path in path.
1003  * If cmd contains a slash or backslash, no lookup is performed.
1004  */
1005 static char *path_lookup(const char *cmd, char **path, int exe_only)
1006 {
1007         char *prog = NULL;
1008         int len = strlen(cmd);
1009         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1010
1011         if (strchr(cmd, '/') || strchr(cmd, '\\'))
1012                 prog = xstrdup(cmd);
1013
1014         while (!prog && *path)
1015                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
1016
1017         return prog;
1018 }
1019
1020 /*
1021  * Create environment block suitable for CreateProcess. Merges current
1022  * process environment and the supplied environment changes.
1023  */
1024 static wchar_t *make_environment_block(char **deltaenv)
1025 {
1026         wchar_t *wenvblk = NULL;
1027         char **tmpenv;
1028         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1029
1030         while (deltaenv && deltaenv[i])
1031                 i++;
1032
1033         /* copy the environment, leaving space for changes */
1034         tmpenv = xmalloc((size + i) * sizeof(char*));
1035         memcpy(tmpenv, environ, size * sizeof(char*));
1036
1037         /* merge supplied environment changes into the temporary environment */
1038         for (i = 0; deltaenv && deltaenv[i]; i++)
1039                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1040
1041         /* create environment block from temporary environment */
1042         for (i = 0; tmpenv[i]; i++) {
1043                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1044                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1045                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1046         }
1047         /* add final \0 terminator */
1048         wenvblk[wenvpos] = 0;
1049         free(tmpenv);
1050         return wenvblk;
1051 }
1052
1053 struct pinfo_t {
1054         struct pinfo_t *next;
1055         pid_t pid;
1056         HANDLE proc;
1057 } pinfo_t;
1058 struct pinfo_t *pinfo = NULL;
1059 CRITICAL_SECTION pinfo_cs;
1060
1061 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1062                               const char *dir,
1063                               int prepend_cmd, int fhin, int fhout, int fherr)
1064 {
1065         STARTUPINFOW si;
1066         PROCESS_INFORMATION pi;
1067         struct strbuf args;
1068         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1069         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1070         BOOL ret;
1071
1072         /* Determine whether or not we are associated to a console */
1073         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1074                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1075                         FILE_ATTRIBUTE_NORMAL, NULL);
1076         if (cons == INVALID_HANDLE_VALUE) {
1077                 /* There is no console associated with this process.
1078                  * Since the child is a console process, Windows
1079                  * would normally create a console window. But
1080                  * since we'll be redirecting std streams, we do
1081                  * not need the console.
1082                  * It is necessary to use DETACHED_PROCESS
1083                  * instead of CREATE_NO_WINDOW to make ssh
1084                  * recognize that it has no console.
1085                  */
1086                 flags |= DETACHED_PROCESS;
1087         } else {
1088                 /* There is already a console. If we specified
1089                  * DETACHED_PROCESS here, too, Windows would
1090                  * disassociate the child from the console.
1091                  * The same is true for CREATE_NO_WINDOW.
1092                  * Go figure!
1093                  */
1094                 CloseHandle(cons);
1095         }
1096         memset(&si, 0, sizeof(si));
1097         si.cb = sizeof(si);
1098         si.dwFlags = STARTF_USESTDHANDLES;
1099         si.hStdInput = winansi_get_osfhandle(fhin);
1100         si.hStdOutput = winansi_get_osfhandle(fhout);
1101         si.hStdError = winansi_get_osfhandle(fherr);
1102
1103         if (xutftowcs_path(wcmd, cmd) < 0)
1104                 return -1;
1105         if (dir && xutftowcs_path(wdir, dir) < 0)
1106                 return -1;
1107
1108         /* concatenate argv, quoting args as we go */
1109         strbuf_init(&args, 0);
1110         if (prepend_cmd) {
1111                 char *quoted = (char *)quote_arg(cmd);
1112                 strbuf_addstr(&args, quoted);
1113                 if (quoted != cmd)
1114                         free(quoted);
1115         }
1116         for (; *argv; argv++) {
1117                 char *quoted = (char *)quote_arg(*argv);
1118                 if (*args.buf)
1119                         strbuf_addch(&args, ' ');
1120                 strbuf_addstr(&args, quoted);
1121                 if (quoted != *argv)
1122                         free(quoted);
1123         }
1124
1125         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1126         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1127         strbuf_release(&args);
1128
1129         wenvblk = make_environment_block(deltaenv);
1130
1131         memset(&pi, 0, sizeof(pi));
1132         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1133                 wenvblk, dir ? wdir : NULL, &si, &pi);
1134
1135         free(wenvblk);
1136         free(wargs);
1137
1138         if (!ret) {
1139                 errno = ENOENT;
1140                 return -1;
1141         }
1142         CloseHandle(pi.hThread);
1143
1144         /*
1145          * The process ID is the human-readable identifier of the process
1146          * that we want to present in log and error messages. The handle
1147          * is not useful for this purpose. But we cannot close it, either,
1148          * because it is not possible to turn a process ID into a process
1149          * handle after the process terminated.
1150          * Keep the handle in a list for waitpid.
1151          */
1152         EnterCriticalSection(&pinfo_cs);
1153         {
1154                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1155                 info->pid = pi.dwProcessId;
1156                 info->proc = pi.hProcess;
1157                 info->next = pinfo;
1158                 pinfo = info;
1159         }
1160         LeaveCriticalSection(&pinfo_cs);
1161
1162         return (pid_t)pi.dwProcessId;
1163 }
1164
1165 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1166 {
1167         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1168 }
1169
1170 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1171                      const char *dir,
1172                      int fhin, int fhout, int fherr)
1173 {
1174         pid_t pid;
1175         char **path = get_path_split();
1176         char *prog = path_lookup(cmd, path, 0);
1177
1178         if (!prog) {
1179                 errno = ENOENT;
1180                 pid = -1;
1181         }
1182         else {
1183                 const char *interpr = parse_interpreter(prog);
1184
1185                 if (interpr) {
1186                         const char *argv0 = argv[0];
1187                         char *iprog = path_lookup(interpr, path, 1);
1188                         argv[0] = prog;
1189                         if (!iprog) {
1190                                 errno = ENOENT;
1191                                 pid = -1;
1192                         }
1193                         else {
1194                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1195                                                        fhin, fhout, fherr);
1196                                 free(iprog);
1197                         }
1198                         argv[0] = argv0;
1199                 }
1200                 else
1201                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1202                                                fhin, fhout, fherr);
1203                 free(prog);
1204         }
1205         free_path_split(path);
1206         return pid;
1207 }
1208
1209 static int try_shell_exec(const char *cmd, char *const *argv)
1210 {
1211         const char *interpr = parse_interpreter(cmd);
1212         char **path;
1213         char *prog;
1214         int pid = 0;
1215
1216         if (!interpr)
1217                 return 0;
1218         path = get_path_split();
1219         prog = path_lookup(interpr, path, 1);
1220         if (prog) {
1221                 int argc = 0;
1222                 const char **argv2;
1223                 while (argv[argc]) argc++;
1224                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1225                 argv2[0] = (char *)cmd; /* full path to the script file */
1226                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1227                 pid = mingw_spawnv(prog, argv2, 1);
1228                 if (pid >= 0) {
1229                         int status;
1230                         if (waitpid(pid, &status, 0) < 0)
1231                                 status = 255;
1232                         exit(status);
1233                 }
1234                 pid = 1;        /* indicate that we tried but failed */
1235                 free(prog);
1236                 free(argv2);
1237         }
1238         free_path_split(path);
1239         return pid;
1240 }
1241
1242 int mingw_execv(const char *cmd, char *const *argv)
1243 {
1244         /* check if git_command is a shell script */
1245         if (!try_shell_exec(cmd, argv)) {
1246                 int pid, status;
1247
1248                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1249                 if (pid < 0)
1250                         return -1;
1251                 if (waitpid(pid, &status, 0) < 0)
1252                         status = 255;
1253                 exit(status);
1254         }
1255         return -1;
1256 }
1257
1258 int mingw_execvp(const char *cmd, char *const *argv)
1259 {
1260         char **path = get_path_split();
1261         char *prog = path_lookup(cmd, path, 0);
1262
1263         if (prog) {
1264                 mingw_execv(prog, argv);
1265                 free(prog);
1266         } else
1267                 errno = ENOENT;
1268
1269         free_path_split(path);
1270         return -1;
1271 }
1272
1273 int mingw_kill(pid_t pid, int sig)
1274 {
1275         if (pid > 0 && sig == SIGTERM) {
1276                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1277
1278                 if (TerminateProcess(h, -1)) {
1279                         CloseHandle(h);
1280                         return 0;
1281                 }
1282
1283                 errno = err_win_to_posix(GetLastError());
1284                 CloseHandle(h);
1285                 return -1;
1286         }
1287
1288         errno = EINVAL;
1289         return -1;
1290 }
1291
1292 /*
1293  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1294  * that service contains a numerical port, or that it is null. It
1295  * does a simple search using gethostbyname, and returns one IPv4 host
1296  * if one was found.
1297  */
1298 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1299                                    const struct addrinfo *hints,
1300                                    struct addrinfo **res)
1301 {
1302         struct hostent *h = NULL;
1303         struct addrinfo *ai;
1304         struct sockaddr_in *sin;
1305
1306         if (node) {
1307                 h = gethostbyname(node);
1308                 if (!h)
1309                         return WSAGetLastError();
1310         }
1311
1312         ai = xmalloc(sizeof(struct addrinfo));
1313         *res = ai;
1314         ai->ai_flags = 0;
1315         ai->ai_family = AF_INET;
1316         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1317         switch (ai->ai_socktype) {
1318         case SOCK_STREAM:
1319                 ai->ai_protocol = IPPROTO_TCP;
1320                 break;
1321         case SOCK_DGRAM:
1322                 ai->ai_protocol = IPPROTO_UDP;
1323                 break;
1324         default:
1325                 ai->ai_protocol = 0;
1326                 break;
1327         }
1328         ai->ai_addrlen = sizeof(struct sockaddr_in);
1329         if (hints && (hints->ai_flags & AI_CANONNAME))
1330                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1331         else
1332                 ai->ai_canonname = NULL;
1333
1334         sin = xmalloc(ai->ai_addrlen);
1335         memset(sin, 0, ai->ai_addrlen);
1336         sin->sin_family = AF_INET;
1337         /* Note: getaddrinfo is supposed to allow service to be a string,
1338          * which should be looked up using getservbyname. This is
1339          * currently not implemented */
1340         if (service)
1341                 sin->sin_port = htons(atoi(service));
1342         if (h)
1343                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1344         else if (hints && (hints->ai_flags & AI_PASSIVE))
1345                 sin->sin_addr.s_addr = INADDR_ANY;
1346         else
1347                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1348         ai->ai_addr = (struct sockaddr *)sin;
1349         ai->ai_next = 0;
1350         return 0;
1351 }
1352
1353 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1354 {
1355         free(res->ai_canonname);
1356         free(res->ai_addr);
1357         free(res);
1358 }
1359
1360 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1361                                    char *host, DWORD hostlen,
1362                                    char *serv, DWORD servlen, int flags)
1363 {
1364         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1365         if (sa->sa_family != AF_INET)
1366                 return EAI_FAMILY;
1367         if (!host && !serv)
1368                 return EAI_NONAME;
1369
1370         if (host && hostlen > 0) {
1371                 struct hostent *ent = NULL;
1372                 if (!(flags & NI_NUMERICHOST))
1373                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1374                                             sizeof(sin->sin_addr), AF_INET);
1375
1376                 if (ent)
1377                         snprintf(host, hostlen, "%s", ent->h_name);
1378                 else if (flags & NI_NAMEREQD)
1379                         return EAI_NONAME;
1380                 else
1381                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1382         }
1383
1384         if (serv && servlen > 0) {
1385                 struct servent *ent = NULL;
1386                 if (!(flags & NI_NUMERICSERV))
1387                         ent = getservbyport(sin->sin_port,
1388                                             flags & NI_DGRAM ? "udp" : "tcp");
1389
1390                 if (ent)
1391                         snprintf(serv, servlen, "%s", ent->s_name);
1392                 else
1393                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1394         }
1395
1396         return 0;
1397 }
1398
1399 static HMODULE ipv6_dll = NULL;
1400 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1401 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1402                                       const struct addrinfo *hints,
1403                                       struct addrinfo **res);
1404 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1405                                       char *host, DWORD hostlen,
1406                                       char *serv, DWORD servlen, int flags);
1407 /*
1408  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1409  * don't need to try to load that one dynamically.
1410  */
1411
1412 static void socket_cleanup(void)
1413 {
1414         WSACleanup();
1415         if (ipv6_dll)
1416                 FreeLibrary(ipv6_dll);
1417         ipv6_dll = NULL;
1418         ipv6_freeaddrinfo = freeaddrinfo_stub;
1419         ipv6_getaddrinfo = getaddrinfo_stub;
1420         ipv6_getnameinfo = getnameinfo_stub;
1421 }
1422
1423 static void ensure_socket_initialization(void)
1424 {
1425         WSADATA wsa;
1426         static int initialized = 0;
1427         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1428         const char **name;
1429
1430         if (initialized)
1431                 return;
1432
1433         if (WSAStartup(MAKEWORD(2,2), &wsa))
1434                 die("unable to initialize winsock subsystem, error %d",
1435                         WSAGetLastError());
1436
1437         for (name = libraries; *name; name++) {
1438                 ipv6_dll = LoadLibrary(*name);
1439                 if (!ipv6_dll)
1440                         continue;
1441
1442                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1443                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1444                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1445                                                    const struct addrinfo *,
1446                                                    struct addrinfo **))
1447                         GetProcAddress(ipv6_dll, "getaddrinfo");
1448                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1449                                                    socklen_t, char *, DWORD,
1450                                                    char *, DWORD, int))
1451                         GetProcAddress(ipv6_dll, "getnameinfo");
1452                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1453                         FreeLibrary(ipv6_dll);
1454                         ipv6_dll = NULL;
1455                 } else
1456                         break;
1457         }
1458         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1459                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1460                 ipv6_getaddrinfo = getaddrinfo_stub;
1461                 ipv6_getnameinfo = getnameinfo_stub;
1462         }
1463
1464         atexit(socket_cleanup);
1465         initialized = 1;
1466 }
1467
1468 #undef gethostname
1469 int mingw_gethostname(char *name, int namelen)
1470 {
1471     ensure_socket_initialization();
1472     return gethostname(name, namelen);
1473 }
1474
1475 #undef gethostbyname
1476 struct hostent *mingw_gethostbyname(const char *host)
1477 {
1478         ensure_socket_initialization();
1479         return gethostbyname(host);
1480 }
1481
1482 void mingw_freeaddrinfo(struct addrinfo *res)
1483 {
1484         ipv6_freeaddrinfo(res);
1485 }
1486
1487 int mingw_getaddrinfo(const char *node, const char *service,
1488                       const struct addrinfo *hints, struct addrinfo **res)
1489 {
1490         ensure_socket_initialization();
1491         return ipv6_getaddrinfo(node, service, hints, res);
1492 }
1493
1494 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1495                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1496                       int flags)
1497 {
1498         ensure_socket_initialization();
1499         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1500 }
1501
1502 int mingw_socket(int domain, int type, int protocol)
1503 {
1504         int sockfd;
1505         SOCKET s;
1506
1507         ensure_socket_initialization();
1508         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1509         if (s == INVALID_SOCKET) {
1510                 /*
1511                  * WSAGetLastError() values are regular BSD error codes
1512                  * biased by WSABASEERR.
1513                  * However, strerror() does not know about networking
1514                  * specific errors, which are values beginning at 38 or so.
1515                  * Therefore, we choose to leave the biased error code
1516                  * in errno so that _if_ someone looks up the code somewhere,
1517                  * then it is at least the number that are usually listed.
1518                  */
1519                 errno = WSAGetLastError();
1520                 return -1;
1521         }
1522         /* convert into a file descriptor */
1523         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1524                 closesocket(s);
1525                 return error("unable to make a socket file descriptor: %s",
1526                         strerror(errno));
1527         }
1528         return sockfd;
1529 }
1530
1531 #undef connect
1532 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1533 {
1534         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1535         return connect(s, sa, sz);
1536 }
1537
1538 #undef bind
1539 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1540 {
1541         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1542         return bind(s, sa, sz);
1543 }
1544
1545 #undef setsockopt
1546 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1547 {
1548         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1549         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1550 }
1551
1552 #undef shutdown
1553 int mingw_shutdown(int sockfd, int how)
1554 {
1555         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1556         return shutdown(s, how);
1557 }
1558
1559 #undef listen
1560 int mingw_listen(int sockfd, int backlog)
1561 {
1562         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1563         return listen(s, backlog);
1564 }
1565
1566 #undef accept
1567 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1568 {
1569         int sockfd2;
1570
1571         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1572         SOCKET s2 = accept(s1, sa, sz);
1573
1574         /* convert into a file descriptor */
1575         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1576                 int err = errno;
1577                 closesocket(s2);
1578                 return error("unable to make a socket file descriptor: %s",
1579                         strerror(err));
1580         }
1581         return sockfd2;
1582 }
1583
1584 #undef rename
1585 int mingw_rename(const char *pold, const char *pnew)
1586 {
1587         DWORD attrs, gle;
1588         int tries = 0;
1589         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1590         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1591                 return -1;
1592
1593         /*
1594          * Try native rename() first to get errno right.
1595          * It is based on MoveFile(), which cannot overwrite existing files.
1596          */
1597         if (!_wrename(wpold, wpnew))
1598                 return 0;
1599         if (errno != EEXIST)
1600                 return -1;
1601 repeat:
1602         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1603                 return 0;
1604         /* TODO: translate more errors */
1605         gle = GetLastError();
1606         if (gle == ERROR_ACCESS_DENIED &&
1607             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1608                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1609                         errno = EISDIR;
1610                         return -1;
1611                 }
1612                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1613                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1614                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1615                                 return 0;
1616                         gle = GetLastError();
1617                         /* revert file attributes on failure */
1618                         SetFileAttributesW(wpnew, attrs);
1619                 }
1620         }
1621         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1622                 /*
1623                  * We assume that some other process had the source or
1624                  * destination file open at the wrong moment and retry.
1625                  * In order to give the other process a higher chance to
1626                  * complete its operation, we give up our time slice now.
1627                  * If we have to retry again, we do sleep a bit.
1628                  */
1629                 Sleep(delay[tries]);
1630                 tries++;
1631                 goto repeat;
1632         }
1633         if (gle == ERROR_ACCESS_DENIED &&
1634                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1635                        "Should I try again?", pold, pnew))
1636                 goto repeat;
1637
1638         errno = EACCES;
1639         return -1;
1640 }
1641
1642 /*
1643  * Note that this doesn't return the actual pagesize, but
1644  * the allocation granularity. If future Windows specific git code
1645  * needs the real getpagesize function, we need to find another solution.
1646  */
1647 int mingw_getpagesize(void)
1648 {
1649         SYSTEM_INFO si;
1650         GetSystemInfo(&si);
1651         return si.dwAllocationGranularity;
1652 }
1653
1654 struct passwd *getpwuid(int uid)
1655 {
1656         static char user_name[100];
1657         static struct passwd p;
1658
1659         DWORD len = sizeof(user_name);
1660         if (!GetUserName(user_name, &len))
1661                 return NULL;
1662         p.pw_name = user_name;
1663         p.pw_gecos = "unknown";
1664         p.pw_dir = NULL;
1665         return &p;
1666 }
1667
1668 static HANDLE timer_event;
1669 static HANDLE timer_thread;
1670 static int timer_interval;
1671 static int one_shot;
1672 static sig_handler_t timer_fn = SIG_DFL;
1673
1674 /* The timer works like this:
1675  * The thread, ticktack(), is a trivial routine that most of the time
1676  * only waits to receive the signal to terminate. The main thread tells
1677  * the thread to terminate by setting the timer_event to the signalled
1678  * state.
1679  * But ticktack() interrupts the wait state after the timer's interval
1680  * length to call the signal handler.
1681  */
1682
1683 static unsigned __stdcall ticktack(void *dummy)
1684 {
1685         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1686                 if (timer_fn == SIG_DFL)
1687                         die("Alarm");
1688                 if (timer_fn != SIG_IGN)
1689                         timer_fn(SIGALRM);
1690                 if (one_shot)
1691                         break;
1692         }
1693         return 0;
1694 }
1695
1696 static int start_timer_thread(void)
1697 {
1698         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1699         if (timer_event) {
1700                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1701                 if (!timer_thread )
1702                         return errno = ENOMEM,
1703                                 error("cannot start timer thread");
1704         } else
1705                 return errno = ENOMEM,
1706                         error("cannot allocate resources for timer");
1707         return 0;
1708 }
1709
1710 static void stop_timer_thread(void)
1711 {
1712         if (timer_event)
1713                 SetEvent(timer_event);  /* tell thread to terminate */
1714         if (timer_thread) {
1715                 int rc = WaitForSingleObject(timer_thread, 1000);
1716                 if (rc == WAIT_TIMEOUT)
1717                         error("timer thread did not terminate timely");
1718                 else if (rc != WAIT_OBJECT_0)
1719                         error("waiting for timer thread failed: %lu",
1720                               GetLastError());
1721                 CloseHandle(timer_thread);
1722         }
1723         if (timer_event)
1724                 CloseHandle(timer_event);
1725         timer_event = NULL;
1726         timer_thread = NULL;
1727 }
1728
1729 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1730 {
1731         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1732 }
1733
1734 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1735 {
1736         static const struct timeval zero;
1737         static int atexit_done;
1738
1739         if (out != NULL)
1740                 return errno = EINVAL,
1741                         error("setitimer param 3 != NULL not implemented");
1742         if (!is_timeval_eq(&in->it_interval, &zero) &&
1743             !is_timeval_eq(&in->it_interval, &in->it_value))
1744                 return errno = EINVAL,
1745                         error("setitimer: it_interval must be zero or eq it_value");
1746
1747         if (timer_thread)
1748                 stop_timer_thread();
1749
1750         if (is_timeval_eq(&in->it_value, &zero) &&
1751             is_timeval_eq(&in->it_interval, &zero))
1752                 return 0;
1753
1754         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1755         one_shot = is_timeval_eq(&in->it_interval, &zero);
1756         if (!atexit_done) {
1757                 atexit(stop_timer_thread);
1758                 atexit_done = 1;
1759         }
1760         return start_timer_thread();
1761 }
1762
1763 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1764 {
1765         if (sig != SIGALRM)
1766                 return errno = EINVAL,
1767                         error("sigaction only implemented for SIGALRM");
1768         if (out != NULL)
1769                 return errno = EINVAL,
1770                         error("sigaction: param 3 != NULL not implemented");
1771
1772         timer_fn = in->sa_handler;
1773         return 0;
1774 }
1775
1776 #undef signal
1777 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1778 {
1779         sig_handler_t old = timer_fn;
1780         if (sig != SIGALRM)
1781                 return signal(sig, handler);
1782         timer_fn = handler;
1783         return old;
1784 }
1785
1786 static const char *make_backslash_path(const char *path)
1787 {
1788         static char buf[PATH_MAX + 1];
1789         char *c;
1790
1791         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1792                 die("Too long path: %.*s", 60, path);
1793
1794         for (c = buf; *c; c++) {
1795                 if (*c == '/')
1796                         *c = '\\';
1797         }
1798         return buf;
1799 }
1800
1801 void mingw_open_html(const char *unixpath)
1802 {
1803         const char *htmlpath = make_backslash_path(unixpath);
1804         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1805                         const char *, const char *, const char *, INT);
1806         T ShellExecute;
1807         HMODULE shell32;
1808         int r;
1809
1810         shell32 = LoadLibrary("shell32.dll");
1811         if (!shell32)
1812                 die("cannot load shell32.dll");
1813         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1814         if (!ShellExecute)
1815                 die("cannot run browser");
1816
1817         printf("Launching default browser to display HTML ...\n");
1818         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1819         FreeLibrary(shell32);
1820         /* see the MSDN documentation referring to the result codes here */
1821         if (r <= 32) {
1822                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1823         }
1824 }
1825
1826 int link(const char *oldpath, const char *newpath)
1827 {
1828         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1829         static T create_hard_link = NULL;
1830         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1831         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1832                 xutftowcs_path(wnewpath, newpath) < 0)
1833                 return -1;
1834
1835         if (!create_hard_link) {
1836                 create_hard_link = (T) GetProcAddress(
1837                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1838                 if (!create_hard_link)
1839                         create_hard_link = (T)-1;
1840         }
1841         if (create_hard_link == (T)-1) {
1842                 errno = ENOSYS;
1843                 return -1;
1844         }
1845         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1846                 errno = err_win_to_posix(GetLastError());
1847                 return -1;
1848         }
1849         return 0;
1850 }
1851
1852 pid_t waitpid(pid_t pid, int *status, int options)
1853 {
1854         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1855             FALSE, pid);
1856         if (!h) {
1857                 errno = ECHILD;
1858                 return -1;
1859         }
1860
1861         if (pid > 0 && options & WNOHANG) {
1862                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1863                         CloseHandle(h);
1864                         return 0;
1865                 }
1866                 options &= ~WNOHANG;
1867         }
1868
1869         if (options == 0) {
1870                 struct pinfo_t **ppinfo;
1871                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1872                         CloseHandle(h);
1873                         return 0;
1874                 }
1875
1876                 if (status)
1877                         GetExitCodeProcess(h, (LPDWORD)status);
1878
1879                 EnterCriticalSection(&pinfo_cs);
1880
1881                 ppinfo = &pinfo;
1882                 while (*ppinfo) {
1883                         struct pinfo_t *info = *ppinfo;
1884                         if (info->pid == pid) {
1885                                 CloseHandle(info->proc);
1886                                 *ppinfo = info->next;
1887                                 free(info);
1888                                 break;
1889                         }
1890                         ppinfo = &info->next;
1891                 }
1892
1893                 LeaveCriticalSection(&pinfo_cs);
1894
1895                 CloseHandle(h);
1896                 return pid;
1897         }
1898         CloseHandle(h);
1899
1900         errno = EINVAL;
1901         return -1;
1902 }
1903
1904 const char *get_windows_home_directory(void)
1905 {
1906         static const char *home_directory = NULL;
1907         struct strbuf buf = STRBUF_INIT;
1908
1909         if (home_directory)
1910                 return home_directory;
1911
1912         home_directory = getenv("HOME");
1913         if (home_directory && *home_directory)
1914                 return home_directory;
1915
1916         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1917         home_directory = strbuf_detach(&buf, NULL);
1918
1919         return home_directory;
1920 }
1921
1922 int mingw_offset_1st_component(const char *path)
1923 {
1924         int offset = 0;
1925         if (has_dos_drive_prefix(path))
1926                 offset = 2;
1927
1928         /* unc paths */
1929         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1930
1931                 /* skip server name */
1932                 char *pos = strpbrk(path + 2, "\\/");
1933                 if (!pos)
1934                         return 0; /* Error: malformed unc path */
1935
1936                 do {
1937                         pos++;
1938                 } while (*pos && !is_dir_sep(*pos));
1939
1940                 offset = pos - path;
1941         }
1942
1943         return offset + is_dir_sep(path[offset]);
1944 }
1945
1946 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1947 {
1948         int upos = 0, wpos = 0;
1949         const unsigned char *utf = (const unsigned char*) utfs;
1950         if (!utf || !wcs || wcslen < 1) {
1951                 errno = EINVAL;
1952                 return -1;
1953         }
1954         /* reserve space for \0 */
1955         wcslen--;
1956         if (utflen < 0)
1957                 utflen = INT_MAX;
1958
1959         while (upos < utflen) {
1960                 int c = utf[upos++] & 0xff;
1961                 if (utflen == INT_MAX && c == 0)
1962                         break;
1963
1964                 if (wpos >= wcslen) {
1965                         wcs[wpos] = 0;
1966                         errno = ERANGE;
1967                         return -1;
1968                 }
1969
1970                 if (c < 0x80) {
1971                         /* ASCII */
1972                         wcs[wpos++] = c;
1973                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1974                                 (utf[upos] & 0xc0) == 0x80) {
1975                         /* 2-byte utf-8 */
1976                         c = ((c & 0x1f) << 6);
1977                         c |= (utf[upos++] & 0x3f);
1978                         wcs[wpos++] = c;
1979                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1980                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1981                                 (utf[upos] & 0xc0) == 0x80 &&
1982                                 (utf[upos + 1] & 0xc0) == 0x80) {
1983                         /* 3-byte utf-8 */
1984                         c = ((c & 0x0f) << 12);
1985                         c |= ((utf[upos++] & 0x3f) << 6);
1986                         c |= (utf[upos++] & 0x3f);
1987                         wcs[wpos++] = c;
1988                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
1989                                 wpos + 1 < wcslen &&
1990                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
1991                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
1992                                 (utf[upos] & 0xc0) == 0x80 &&
1993                                 (utf[upos + 1] & 0xc0) == 0x80 &&
1994                                 (utf[upos + 2] & 0xc0) == 0x80) {
1995                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
1996                         c = ((c & 0x07) << 18);
1997                         c |= ((utf[upos++] & 0x3f) << 12);
1998                         c |= ((utf[upos++] & 0x3f) << 6);
1999                         c |= (utf[upos++] & 0x3f);
2000                         c -= 0x10000;
2001                         wcs[wpos++] = 0xd800 | (c >> 10);
2002                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2003                 } else if (c >= 0xa0) {
2004                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2005                         wcs[wpos++] = c;
2006                 } else {
2007                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2008                         static const char *hex = "0123456789abcdef";
2009                         wcs[wpos++] = hex[c >> 4];
2010                         if (wpos < wcslen)
2011                                 wcs[wpos++] = hex[c & 0x0f];
2012                 }
2013         }
2014         wcs[wpos] = 0;
2015         return wpos;
2016 }
2017
2018 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2019 {
2020         if (!wcs || !utf || utflen < 1) {
2021                 errno = EINVAL;
2022                 return -1;
2023         }
2024         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2025         if (utflen)
2026                 return utflen - 1;
2027         errno = ERANGE;
2028         return -1;
2029 }
2030
2031 /*
2032  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2033  * mingw startup code, see init.c in mingw runtime).
2034  */
2035 int _CRT_glob = 0;
2036
2037 typedef struct {
2038         int newmode;
2039 } _startupinfo;
2040
2041 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2042                 _startupinfo *si);
2043
2044 static NORETURN void die_startup()
2045 {
2046         fputs("fatal: not enough memory for initialization", stderr);
2047         exit(128);
2048 }
2049
2050 static void *malloc_startup(size_t size)
2051 {
2052         void *result = malloc(size);
2053         if (!result)
2054                 die_startup();
2055         return result;
2056 }
2057
2058 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2059 {
2060         len = xwcstoutf(buffer, wcs, len) + 1;
2061         return memcpy(malloc_startup(len), buffer, len);
2062 }
2063
2064 void mingw_startup()
2065 {
2066         int i, maxlen, argc;
2067         char *buffer;
2068         wchar_t **wenv, **wargv;
2069         _startupinfo si;
2070
2071         /* get wide char arguments and environment */
2072         si.newmode = 0;
2073         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2074                 die_startup();
2075
2076         /* determine size of argv and environ conversion buffer */
2077         maxlen = wcslen(_wpgmptr);
2078         for (i = 1; i < argc; i++)
2079                 maxlen = max(maxlen, wcslen(wargv[i]));
2080         for (i = 0; wenv[i]; i++)
2081                 maxlen = max(maxlen, wcslen(wenv[i]));
2082
2083         /*
2084          * nedmalloc can't free CRT memory, allocate resizable environment
2085          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2086          * use it while initializing the environment itself.
2087          */
2088         environ_size = i + 1;
2089         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2090         environ = malloc_startup(environ_alloc);
2091
2092         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2093         maxlen = 3 * maxlen + 1;
2094         buffer = malloc_startup(maxlen);
2095
2096         /* convert command line arguments and environment to UTF-8 */
2097         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2098         for (i = 1; i < argc; i++)
2099                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2100         for (i = 0; wenv[i]; i++)
2101                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2102         environ[i] = NULL;
2103         free(buffer);
2104
2105         /* sort environment for O(log n) getenv / putenv */
2106         qsort(environ, i, sizeof(char*), compareenv);
2107
2108         /* fix Windows specific environment settings */
2109
2110         /* on Windows it is TMP and TEMP */
2111         if (!getenv("TMPDIR")) {
2112                 const char *tmp = getenv("TMP");
2113                 if (!tmp)
2114                         tmp = getenv("TEMP");
2115                 if (tmp)
2116                         setenv("TMPDIR", tmp, 1);
2117         }
2118
2119         /* simulate TERM to enable auto-color (see color.c) */
2120         if (!getenv("TERM"))
2121                 setenv("TERM", "winansi", 1);
2122
2123         /* initialize critical section for waitpid pinfo_t list */
2124         InitializeCriticalSection(&pinfo_cs);
2125
2126         /* set up default file mode and file modes for stdin/out/err */
2127         _fmode = _O_BINARY;
2128         _setmode(_fileno(stdin), _O_BINARY);
2129         _setmode(_fileno(stdout), _O_BINARY);
2130         _setmode(_fileno(stderr), _O_BINARY);
2131
2132         /* initialize Unicode console */
2133         winansi_init();
2134 }