compat/mingw.c

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