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 /*
 741  * Compare environment entries by key (i.e. stopping at '=' or '\0').
 742  */
 743 static int compareenv(const void *v1, const void *v2)
 744 {
 745         const char *e1 = *(const char**)v1;
 746         const char *e2 = *(const char**)v2;
 747
 748         for (;;) {
 749                 int c1 = *e1++;
 750                 int c2 = *e2++;
 751                 c1 = (c1 == '=') ? 0 : tolower(c1);
 752                 c2 = (c2 == '=') ? 0 : tolower(c2);
 753                 if (c1 > c2)
 754                         return 1;
 755                 if (c1 < c2)
 756                         return -1;
 757                 if (c1 == 0)
 758                         return 0;
 759         }
 760 }
 761
 762 static int bsearchenv(char **env, const char *name, size_t size)
 763 {
 764         unsigned low = 0, high = size;
 765         while (low < high) {
 766                 unsigned mid = low + ((high - low) >> 1);
 767                 int cmp = compareenv(&env[mid], &name);
 768                 if (cmp < 0)
 769                         low = mid + 1;
 770                 else if (cmp > 0)
 771                         high = mid;
 772                 else
 773                         return mid;
 774         }
 775         return ~low; /* not found, return 1's complement of insert position */
 776 }
 777
 778 /*
 779  * If name contains '=', then sets the variable, otherwise it unsets it
 780  * Size includes the terminating NULL. Env must have room for size + 1 entries
 781  * (in case of insert). Returns the new size. Optionally frees removed entries.
 782  */
 783 static int do_putenv(char **env, const char *name, int size, int free_old)
 784 {
 785         int i = bsearchenv(env, name, size - 1);
 786
 787         /* optionally free removed / replaced entry */
 788         if (i >= 0 && free_old)
 789                 free(env[i]);
 790
 791         if (strchr(name, '=')) {
 792                 /* if new value ('key=value') is specified, insert or replace entry */
 793                 if (i < 0) {
 794                         i = ~i;
 795                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
 796                         size++;
 797                 }
 798                 env[i] = (char*) name;
 799         } else if (i >= 0) {
 800                 /* otherwise ('key') remove existing entry */
 801                 size--;
 802                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
 803         }
 804         return size;
 805 }
 806
 807 /* used number of elements of environ array, including terminating NULL */
 808 static int environ_size = 0;
 809 /* allocated size of environ array, in bytes */
 810 static int environ_alloc = 0;
 811
 812 static char *do_getenv(const char *name)
 813 {
 814         char *value;
 815         int pos = bsearchenv(environ, name, environ_size - 1);
 816         if (pos < 0)
 817                 return NULL;
 818         value = strchr(environ[pos], '=');
 819         return value ? &value[1] : NULL;
 820 }
 821
 822 char *mingw_getenv(const char *name)
 823 {
 824         char *result = do_getenv(name);
 825         if (!result && !strcmp(name, "TMPDIR")) {
 826                 /* on Windows it is TMP and TEMP */
 827                 result = do_getenv("TMP");
 828                 if (!result)
 829                         result = do_getenv("TEMP");
 830         }
 831         else if (!result && !strcmp(name, "TERM")) {
 832                 /* simulate TERM to enable auto-color (see color.c) */
 833                 result = "winansi";
 834         }
 835         return result;
 836 }
 837
 838 int mingw_putenv(const char *namevalue)
 839 {
 840         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
 841         environ_size = do_putenv(environ, namevalue, environ_size, 1);
 842         return 0;
 843 }
 844
 845 /*
 846  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 847  * (Parsing C++ Command-Line Arguments)
 848  */
 849 static const char *quote_arg(const char *arg)
 850 {
 851         /* count chars to quote */
 852         int len = 0, n = 0;
 853         int force_quotes = 0;
 854         char *q, *d;
 855         const char *p = arg;
 856         if (!*p) force_quotes = 1;
 857         while (*p) {
 858                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 859                         force_quotes = 1;
 860                 else if (*p == '"')
 861                         n++;
 862                 else if (*p == '\\') {
 863                         int count = 0;
 864                         while (*p == '\\') {
 865                                 count++;
 866                                 p++;
 867                                 len++;
 868                         }
 869                         if (*p == '"')
 870                                 n += count*2 + 1;
 871                         continue;
 872                 }
 873                 len++;
 874                 p++;
 875         }
 876         if (!force_quotes && n == 0)
 877                 return arg;
 878
 879         /* insert \ where necessary */
 880         d = q = xmalloc(len+n+3);
 881         *d++ = '"';
 882         while (*arg) {
 883                 if (*arg == '"')
 884                         *d++ = '\\';
 885                 else if (*arg == '\\') {
 886                         int count = 0;
 887                         while (*arg == '\\') {
 888                                 count++;
 889                                 *d++ = *arg++;
 890                         }
 891                         if (*arg == '"') {
 892                                 while (count-- > 0)
 893                                         *d++ = '\\';
 894                                 *d++ = '\\';
 895                         }
 896                 }
 897                 *d++ = *arg++;
 898         }
 899         *d++ = '"';
 900         *d++ = 0;
 901         return q;
 902 }
 903
 904 static const char *parse_interpreter(const char *cmd)
 905 {
 906         static char buf[100];
 907         char *p, *opt;
 908         int n, fd;
 909
 910         /* don't even try a .exe */
 911         n = strlen(cmd);
 912         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 913                 return NULL;
 914
 915         fd = open(cmd, O_RDONLY);
 916         if (fd < 0)
 917                 return NULL;
 918         n = read(fd, buf, sizeof(buf)-1);
 919         close(fd);
 920         if (n < 4)      /* at least '#!/x' and not error */
 921                 return NULL;
 922
 923         if (buf[0] != '#' || buf[1] != '!')
 924                 return NULL;
 925         buf[n] = '\0';
 926         p = buf + strcspn(buf, "\r\n");
 927         if (!*p)
 928                 return NULL;
 929
 930         *p = '\0';
 931         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 932                 return NULL;
 933         /* strip options */
 934         if ((opt = strchr(p+1, ' ')))
 935                 *opt = '\0';
 936         return p+1;
 937 }
 938
 939 /*
 940  * Splits the PATH into parts.
 941  */
 942 static char **get_path_split(void)
 943 {
 944         char *p, **path, *envpath = getenv("PATH");
 945         int i, n = 0;
 946
 947         if (!envpath || !*envpath)
 948                 return NULL;
 949
 950         envpath = xstrdup(envpath);
 951         p = envpath;
 952         while (p) {
 953                 char *dir = p;
 954                 p = strchr(p, ';');
 955                 if (p) *p++ = '\0';
 956                 if (*dir) {     /* not earlier, catches series of ; */
 957                         ++n;
 958                 }
 959         }
 960         if (!n)
 961                 return NULL;
 962
 963         path = xmalloc((n+1)*sizeof(char *));
 964         p = envpath;
 965         i = 0;
 966         do {
 967                 if (*p)
 968                         path[i++] = xstrdup(p);
 969                 p = p+strlen(p)+1;
 970         } while (i < n);
 971         path[i] = NULL;
 972
 973         free(envpath);
 974
 975         return path;
 976 }
 977
 978 static void free_path_split(char **path)
 979 {
 980         char **p = path;
 981
 982         if (!path)
 983                 return;
 984
 985         while (*p)
 986                 free(*p++);
 987         free(path);
 988 }
 989
 990 /*
 991  * exe_only means that we only want to detect .exe files, but not scripts
 992  * (which do not have an extension)
 993  */
 994 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 995 {
 996         char path[MAX_PATH];
 997         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 998
 999         if (!isexe && access(path, F_OK) == 0)
1000                 return xstrdup(path);
1001         path[strlen(path)-4] = '\0';
1002         if ((!exe_only || isexe) && access(path, F_OK) == 0)
1003                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1004                         return xstrdup(path);
1005         return NULL;
1006 }
1007
1008 /*
1009  * Determines the absolute path of cmd using the split path in path.
1010  * If cmd contains a slash or backslash, no lookup is performed.
1011  */
1012 static char *path_lookup(const char *cmd, char **path, int exe_only)
1013 {
1014         char *prog = NULL;
1015         int len = strlen(cmd);
1016         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1017
1018         if (strchr(cmd, '/') || strchr(cmd, '\\'))
1019                 prog = xstrdup(cmd);
1020
1021         while (!prog && *path)
1022                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
1023
1024         return prog;
1025 }
1026
1027 /*
1028  * Create environment block suitable for CreateProcess. Merges current
1029  * process environment and the supplied environment changes.
1030  */
1031 static wchar_t *make_environment_block(char **deltaenv)
1032 {
1033         wchar_t *wenvblk = NULL;
1034         char **tmpenv;
1035         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1036
1037         while (deltaenv && deltaenv[i])
1038                 i++;
1039
1040         /* copy the environment, leaving space for changes */
1041         tmpenv = xmalloc((size + i) * sizeof(char*));
1042         memcpy(tmpenv, environ, size * sizeof(char*));
1043
1044         /* merge supplied environment changes into the temporary environment */
1045         for (i = 0; deltaenv && deltaenv[i]; i++)
1046                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1047
1048         /* create environment block from temporary environment */
1049         for (i = 0; tmpenv[i]; i++) {
1050                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1051                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1052                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1053         }
1054         /* add final \0 terminator */
1055         wenvblk[wenvpos] = 0;
1056         free(tmpenv);
1057         return wenvblk;
1058 }
1059
1060 struct pinfo_t {
1061         struct pinfo_t *next;
1062         pid_t pid;
1063         HANDLE proc;
1064 } pinfo_t;
1065 struct pinfo_t *pinfo = NULL;
1066 CRITICAL_SECTION pinfo_cs;
1067
1068 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1069                               const char *dir,
1070                               int prepend_cmd, int fhin, int fhout, int fherr)
1071 {
1072         STARTUPINFOW si;
1073         PROCESS_INFORMATION pi;
1074         struct strbuf args;
1075         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1076         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1077         BOOL ret;
1078
1079         /* Determine whether or not we are associated to a console */
1080         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1081                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1082                         FILE_ATTRIBUTE_NORMAL, NULL);
1083         if (cons == INVALID_HANDLE_VALUE) {
1084                 /* There is no console associated with this process.
1085                  * Since the child is a console process, Windows
1086                  * would normally create a console window. But
1087                  * since we'll be redirecting std streams, we do
1088                  * not need the console.
1089                  * It is necessary to use DETACHED_PROCESS
1090                  * instead of CREATE_NO_WINDOW to make ssh
1091                  * recognize that it has no console.
1092                  */
1093                 flags |= DETACHED_PROCESS;
1094         } else {
1095                 /* There is already a console. If we specified
1096                  * DETACHED_PROCESS here, too, Windows would
1097                  * disassociate the child from the console.
1098                  * The same is true for CREATE_NO_WINDOW.
1099                  * Go figure!
1100                  */
1101                 CloseHandle(cons);
1102         }
1103         memset(&si, 0, sizeof(si));
1104         si.cb = sizeof(si);
1105         si.dwFlags = STARTF_USESTDHANDLES;
1106         si.hStdInput = winansi_get_osfhandle(fhin);
1107         si.hStdOutput = winansi_get_osfhandle(fhout);
1108         si.hStdError = winansi_get_osfhandle(fherr);
1109
1110         if (xutftowcs_path(wcmd, cmd) < 0)
1111                 return -1;
1112         if (dir && xutftowcs_path(wdir, dir) < 0)
1113                 return -1;
1114
1115         /* concatenate argv, quoting args as we go */
1116         strbuf_init(&args, 0);
1117         if (prepend_cmd) {
1118                 char *quoted = (char *)quote_arg(cmd);
1119                 strbuf_addstr(&args, quoted);
1120                 if (quoted != cmd)
1121                         free(quoted);
1122         }
1123         for (; *argv; argv++) {
1124                 char *quoted = (char *)quote_arg(*argv);
1125                 if (*args.buf)
1126                         strbuf_addch(&args, ' ');
1127                 strbuf_addstr(&args, quoted);
1128                 if (quoted != *argv)
1129                         free(quoted);
1130         }
1131
1132         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1133         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1134         strbuf_release(&args);
1135
1136         wenvblk = make_environment_block(deltaenv);
1137
1138         memset(&pi, 0, sizeof(pi));
1139         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1140                 wenvblk, dir ? wdir : NULL, &si, &pi);
1141
1142         free(wenvblk);
1143         free(wargs);
1144
1145         if (!ret) {
1146                 errno = ENOENT;
1147                 return -1;
1148         }
1149         CloseHandle(pi.hThread);
1150
1151         /*
1152          * The process ID is the human-readable identifier of the process
1153          * that we want to present in log and error messages. The handle
1154          * is not useful for this purpose. But we cannot close it, either,
1155          * because it is not possible to turn a process ID into a process
1156          * handle after the process terminated.
1157          * Keep the handle in a list for waitpid.
1158          */
1159         EnterCriticalSection(&pinfo_cs);
1160         {
1161                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1162                 info->pid = pi.dwProcessId;
1163                 info->proc = pi.hProcess;
1164                 info->next = pinfo;
1165                 pinfo = info;
1166         }
1167         LeaveCriticalSection(&pinfo_cs);
1168
1169         return (pid_t)pi.dwProcessId;
1170 }
1171
1172 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1173 {
1174         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1175 }
1176
1177 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1178                      const char *dir,
1179                      int fhin, int fhout, int fherr)
1180 {
1181         pid_t pid;
1182         char **path = get_path_split();
1183         char *prog = path_lookup(cmd, path, 0);
1184
1185         if (!prog) {
1186                 errno = ENOENT;
1187                 pid = -1;
1188         }
1189         else {
1190                 const char *interpr = parse_interpreter(prog);
1191
1192                 if (interpr) {
1193                         const char *argv0 = argv[0];
1194                         char *iprog = path_lookup(interpr, path, 1);
1195                         argv[0] = prog;
1196                         if (!iprog) {
1197                                 errno = ENOENT;
1198                                 pid = -1;
1199                         }
1200                         else {
1201                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1202                                                        fhin, fhout, fherr);
1203                                 free(iprog);
1204                         }
1205                         argv[0] = argv0;
1206                 }
1207                 else
1208                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1209                                                fhin, fhout, fherr);
1210                 free(prog);
1211         }
1212         free_path_split(path);
1213         return pid;
1214 }
1215
1216 static int try_shell_exec(const char *cmd, char *const *argv)
1217 {
1218         const char *interpr = parse_interpreter(cmd);
1219         char **path;
1220         char *prog;
1221         int pid = 0;
1222
1223         if (!interpr)
1224                 return 0;
1225         path = get_path_split();
1226         prog = path_lookup(interpr, path, 1);
1227         if (prog) {
1228                 int argc = 0;
1229                 const char **argv2;
1230                 while (argv[argc]) argc++;
1231                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1232                 argv2[0] = (char *)cmd; /* full path to the script file */
1233                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1234                 pid = mingw_spawnv(prog, argv2, 1);
1235                 if (pid >= 0) {
1236                         int status;
1237                         if (waitpid(pid, &status, 0) < 0)
1238                                 status = 255;
1239                         exit(status);
1240                 }
1241                 pid = 1;        /* indicate that we tried but failed */
1242                 free(prog);
1243                 free(argv2);
1244         }
1245         free_path_split(path);
1246         return pid;
1247 }
1248
1249 void mingw_execv(const char *cmd, char *const *argv)
1250 {
1251         /* check if git_command is a shell script */
1252         if (!try_shell_exec(cmd, argv)) {
1253                 int pid, status;
1254
1255                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1256                 if (pid < 0)
1257                         return;
1258                 if (waitpid(pid, &status, 0) < 0)
1259                         status = 255;
1260                 exit(status);
1261         }
1262 }
1263
1264 int mingw_execvp(const char *cmd, char *const *argv)
1265 {
1266         char **path = get_path_split();
1267         char *prog = path_lookup(cmd, path, 0);
1268
1269         if (prog) {
1270                 mingw_execv(prog, argv);
1271                 free(prog);
1272         } else
1273                 errno = ENOENT;
1274
1275         free_path_split(path);
1276         return -1;
1277 }
1278
1279 int mingw_kill(pid_t pid, int sig)
1280 {
1281         if (pid > 0 && sig == SIGTERM) {
1282                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1283
1284                 if (TerminateProcess(h, -1)) {
1285                         CloseHandle(h);
1286                         return 0;
1287                 }
1288
1289                 errno = err_win_to_posix(GetLastError());
1290                 CloseHandle(h);
1291                 return -1;
1292         }
1293
1294         errno = EINVAL;
1295         return -1;
1296 }
1297
1298 /*
1299  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1300  * that service contains a numerical port, or that it is null. It
1301  * does a simple search using gethostbyname, and returns one IPv4 host
1302  * if one was found.
1303  */
1304 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1305                                    const struct addrinfo *hints,
1306                                    struct addrinfo **res)
1307 {
1308         struct hostent *h = NULL;
1309         struct addrinfo *ai;
1310         struct sockaddr_in *sin;
1311
1312         if (node) {
1313                 h = gethostbyname(node);
1314                 if (!h)
1315                         return WSAGetLastError();
1316         }
1317
1318         ai = xmalloc(sizeof(struct addrinfo));
1319         *res = ai;
1320         ai->ai_flags = 0;
1321         ai->ai_family = AF_INET;
1322         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1323         switch (ai->ai_socktype) {
1324         case SOCK_STREAM:
1325                 ai->ai_protocol = IPPROTO_TCP;
1326                 break;
1327         case SOCK_DGRAM:
1328                 ai->ai_protocol = IPPROTO_UDP;
1329                 break;
1330         default:
1331                 ai->ai_protocol = 0;
1332                 break;
1333         }
1334         ai->ai_addrlen = sizeof(struct sockaddr_in);
1335         if (hints && (hints->ai_flags & AI_CANONNAME))
1336                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1337         else
1338                 ai->ai_canonname = NULL;
1339
1340         sin = xmalloc(ai->ai_addrlen);
1341         memset(sin, 0, ai->ai_addrlen);
1342         sin->sin_family = AF_INET;
1343         /* Note: getaddrinfo is supposed to allow service to be a string,
1344          * which should be looked up using getservbyname. This is
1345          * currently not implemented */
1346         if (service)
1347                 sin->sin_port = htons(atoi(service));
1348         if (h)
1349                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1350         else if (hints && (hints->ai_flags & AI_PASSIVE))
1351                 sin->sin_addr.s_addr = INADDR_ANY;
1352         else
1353                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1354         ai->ai_addr = (struct sockaddr *)sin;
1355         ai->ai_next = 0;
1356         return 0;
1357 }
1358
1359 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1360 {
1361         free(res->ai_canonname);
1362         free(res->ai_addr);
1363         free(res);
1364 }
1365
1366 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1367                                    char *host, DWORD hostlen,
1368                                    char *serv, DWORD servlen, int flags)
1369 {
1370         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1371         if (sa->sa_family != AF_INET)
1372                 return EAI_FAMILY;
1373         if (!host && !serv)
1374                 return EAI_NONAME;
1375
1376         if (host && hostlen > 0) {
1377                 struct hostent *ent = NULL;
1378                 if (!(flags & NI_NUMERICHOST))
1379                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1380                                             sizeof(sin->sin_addr), AF_INET);
1381
1382                 if (ent)
1383                         snprintf(host, hostlen, "%s", ent->h_name);
1384                 else if (flags & NI_NAMEREQD)
1385                         return EAI_NONAME;
1386                 else
1387                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1388         }
1389
1390         if (serv && servlen > 0) {
1391                 struct servent *ent = NULL;
1392                 if (!(flags & NI_NUMERICSERV))
1393                         ent = getservbyport(sin->sin_port,
1394                                             flags & NI_DGRAM ? "udp" : "tcp");
1395
1396                 if (ent)
1397                         snprintf(serv, servlen, "%s", ent->s_name);
1398                 else
1399                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1400         }
1401
1402         return 0;
1403 }
1404
1405 static HMODULE ipv6_dll = NULL;
1406 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1407 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1408                                       const struct addrinfo *hints,
1409                                       struct addrinfo **res);
1410 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1411                                       char *host, DWORD hostlen,
1412                                       char *serv, DWORD servlen, int flags);
1413 /*
1414  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1415  * don't need to try to load that one dynamically.
1416  */
1417
1418 static void socket_cleanup(void)
1419 {
1420         WSACleanup();
1421         if (ipv6_dll)
1422                 FreeLibrary(ipv6_dll);
1423         ipv6_dll = NULL;
1424         ipv6_freeaddrinfo = freeaddrinfo_stub;
1425         ipv6_getaddrinfo = getaddrinfo_stub;
1426         ipv6_getnameinfo = getnameinfo_stub;
1427 }
1428
1429 static void ensure_socket_initialization(void)
1430 {
1431         WSADATA wsa;
1432         static int initialized = 0;
1433         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1434         const char **name;
1435
1436         if (initialized)
1437                 return;
1438
1439         if (WSAStartup(MAKEWORD(2,2), &wsa))
1440                 die("unable to initialize winsock subsystem, error %d",
1441                         WSAGetLastError());
1442
1443         for (name = libraries; *name; name++) {
1444                 ipv6_dll = LoadLibrary(*name);
1445                 if (!ipv6_dll)
1446                         continue;
1447
1448                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1449                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1450                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1451                                                    const struct addrinfo *,
1452                                                    struct addrinfo **))
1453                         GetProcAddress(ipv6_dll, "getaddrinfo");
1454                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1455                                                    socklen_t, char *, DWORD,
1456                                                    char *, DWORD, int))
1457                         GetProcAddress(ipv6_dll, "getnameinfo");
1458                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1459                         FreeLibrary(ipv6_dll);
1460                         ipv6_dll = NULL;
1461                 } else
1462                         break;
1463         }
1464         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1465                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1466                 ipv6_getaddrinfo = getaddrinfo_stub;
1467                 ipv6_getnameinfo = getnameinfo_stub;
1468         }
1469
1470         atexit(socket_cleanup);
1471         initialized = 1;
1472 }
1473
1474 #undef gethostname
1475 int mingw_gethostname(char *name, int namelen)
1476 {
1477     ensure_socket_initialization();
1478     return gethostname(name, namelen);
1479 }
1480
1481 #undef gethostbyname
1482 struct hostent *mingw_gethostbyname(const char *host)
1483 {
1484         ensure_socket_initialization();
1485         return gethostbyname(host);
1486 }
1487
1488 void mingw_freeaddrinfo(struct addrinfo *res)
1489 {
1490         ipv6_freeaddrinfo(res);
1491 }
1492
1493 int mingw_getaddrinfo(const char *node, const char *service,
1494                       const struct addrinfo *hints, struct addrinfo **res)
1495 {
1496         ensure_socket_initialization();
1497         return ipv6_getaddrinfo(node, service, hints, res);
1498 }
1499
1500 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1501                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1502                       int flags)
1503 {
1504         ensure_socket_initialization();
1505         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1506 }
1507
1508 int mingw_socket(int domain, int type, int protocol)
1509 {
1510         int sockfd;
1511         SOCKET s;
1512
1513         ensure_socket_initialization();
1514         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1515         if (s == INVALID_SOCKET) {
1516                 /*
1517                  * WSAGetLastError() values are regular BSD error codes
1518                  * biased by WSABASEERR.
1519                  * However, strerror() does not know about networking
1520                  * specific errors, which are values beginning at 38 or so.
1521                  * Therefore, we choose to leave the biased error code
1522                  * in errno so that _if_ someone looks up the code somewhere,
1523                  * then it is at least the number that are usually listed.
1524                  */
1525                 errno = WSAGetLastError();
1526                 return -1;
1527         }
1528         /* convert into a file descriptor */
1529         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1530                 closesocket(s);
1531                 return error("unable to make a socket file descriptor: %s",
1532                         strerror(errno));
1533         }
1534         return sockfd;
1535 }
1536
1537 #undef connect
1538 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1539 {
1540         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1541         return connect(s, sa, sz);
1542 }
1543
1544 #undef bind
1545 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1546 {
1547         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1548         return bind(s, sa, sz);
1549 }
1550
1551 #undef setsockopt
1552 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1553 {
1554         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1555         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1556 }
1557
1558 #undef shutdown
1559 int mingw_shutdown(int sockfd, int how)
1560 {
1561         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1562         return shutdown(s, how);
1563 }
1564
1565 #undef listen
1566 int mingw_listen(int sockfd, int backlog)
1567 {
1568         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1569         return listen(s, backlog);
1570 }
1571
1572 #undef accept
1573 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1574 {
1575         int sockfd2;
1576
1577         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1578         SOCKET s2 = accept(s1, sa, sz);
1579
1580         /* convert into a file descriptor */
1581         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1582                 int err = errno;
1583                 closesocket(s2);
1584                 return error("unable to make a socket file descriptor: %s",
1585                         strerror(err));
1586         }
1587         return sockfd2;
1588 }
1589
1590 #undef rename
1591 int mingw_rename(const char *pold, const char *pnew)
1592 {
1593         DWORD attrs, gle;
1594         int tries = 0;
1595         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1596         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1597                 return -1;
1598
1599         /*
1600          * Try native rename() first to get errno right.
1601          * It is based on MoveFile(), which cannot overwrite existing files.
1602          */
1603         if (!_wrename(wpold, wpnew))
1604                 return 0;
1605         if (errno != EEXIST)
1606                 return -1;
1607 repeat:
1608         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1609                 return 0;
1610         /* TODO: translate more errors */
1611         gle = GetLastError();
1612         if (gle == ERROR_ACCESS_DENIED &&
1613             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1614                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1615                         errno = EISDIR;
1616                         return -1;
1617                 }
1618                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1619                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1620                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1621                                 return 0;
1622                         gle = GetLastError();
1623                         /* revert file attributes on failure */
1624                         SetFileAttributesW(wpnew, attrs);
1625                 }
1626         }
1627         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1628                 /*
1629                  * We assume that some other process had the source or
1630                  * destination file open at the wrong moment and retry.
1631                  * In order to give the other process a higher chance to
1632                  * complete its operation, we give up our time slice now.
1633                  * If we have to retry again, we do sleep a bit.
1634                  */
1635                 Sleep(delay[tries]);
1636                 tries++;
1637                 goto repeat;
1638         }
1639         if (gle == ERROR_ACCESS_DENIED &&
1640                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1641                        "Should I try again?", pold, pnew))
1642                 goto repeat;
1643
1644         errno = EACCES;
1645         return -1;
1646 }
1647
1648 /*
1649  * Note that this doesn't return the actual pagesize, but
1650  * the allocation granularity. If future Windows specific git code
1651  * needs the real getpagesize function, we need to find another solution.
1652  */
1653 int mingw_getpagesize(void)
1654 {
1655         SYSTEM_INFO si;
1656         GetSystemInfo(&si);
1657         return si.dwAllocationGranularity;
1658 }
1659
1660 struct passwd *getpwuid(int uid)
1661 {
1662         static char user_name[100];
1663         static struct passwd p;
1664
1665         DWORD len = sizeof(user_name);
1666         if (!GetUserName(user_name, &len))
1667                 return NULL;
1668         p.pw_name = user_name;
1669         p.pw_gecos = "unknown";
1670         p.pw_dir = NULL;
1671         return &p;
1672 }
1673
1674 static HANDLE timer_event;
1675 static HANDLE timer_thread;
1676 static int timer_interval;
1677 static int one_shot;
1678 static sig_handler_t timer_fn = SIG_DFL;
1679
1680 /* The timer works like this:
1681  * The thread, ticktack(), is a trivial routine that most of the time
1682  * only waits to receive the signal to terminate. The main thread tells
1683  * the thread to terminate by setting the timer_event to the signalled
1684  * state.
1685  * But ticktack() interrupts the wait state after the timer's interval
1686  * length to call the signal handler.
1687  */
1688
1689 static unsigned __stdcall ticktack(void *dummy)
1690 {
1691         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1692                 if (timer_fn == SIG_DFL)
1693                         die("Alarm");
1694                 if (timer_fn != SIG_IGN)
1695                         timer_fn(SIGALRM);
1696                 if (one_shot)
1697                         break;
1698         }
1699         return 0;
1700 }
1701
1702 static int start_timer_thread(void)
1703 {
1704         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1705         if (timer_event) {
1706                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1707                 if (!timer_thread )
1708                         return errno = ENOMEM,
1709                                 error("cannot start timer thread");
1710         } else
1711                 return errno = ENOMEM,
1712                         error("cannot allocate resources for timer");
1713         return 0;
1714 }
1715
1716 static void stop_timer_thread(void)
1717 {
1718         if (timer_event)
1719                 SetEvent(timer_event);  /* tell thread to terminate */
1720         if (timer_thread) {
1721                 int rc = WaitForSingleObject(timer_thread, 1000);
1722                 if (rc == WAIT_TIMEOUT)
1723                         error("timer thread did not terminate timely");
1724                 else if (rc != WAIT_OBJECT_0)
1725                         error("waiting for timer thread failed: %lu",
1726                               GetLastError());
1727                 CloseHandle(timer_thread);
1728         }
1729         if (timer_event)
1730                 CloseHandle(timer_event);
1731         timer_event = NULL;
1732         timer_thread = NULL;
1733 }
1734
1735 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1736 {
1737         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1738 }
1739
1740 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1741 {
1742         static const struct timeval zero;
1743         static int atexit_done;
1744
1745         if (out != NULL)
1746                 return errno = EINVAL,
1747                         error("setitimer param 3 != NULL not implemented");
1748         if (!is_timeval_eq(&in->it_interval, &zero) &&
1749             !is_timeval_eq(&in->it_interval, &in->it_value))
1750                 return errno = EINVAL,
1751                         error("setitimer: it_interval must be zero or eq it_value");
1752
1753         if (timer_thread)
1754                 stop_timer_thread();
1755
1756         if (is_timeval_eq(&in->it_value, &zero) &&
1757             is_timeval_eq(&in->it_interval, &zero))
1758                 return 0;
1759
1760         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1761         one_shot = is_timeval_eq(&in->it_interval, &zero);
1762         if (!atexit_done) {
1763                 atexit(stop_timer_thread);
1764                 atexit_done = 1;
1765         }
1766         return start_timer_thread();
1767 }
1768
1769 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1770 {
1771         if (sig != SIGALRM)
1772                 return errno = EINVAL,
1773                         error("sigaction only implemented for SIGALRM");
1774         if (out != NULL)
1775                 return errno = EINVAL,
1776                         error("sigaction: param 3 != NULL not implemented");
1777
1778         timer_fn = in->sa_handler;
1779         return 0;
1780 }
1781
1782 #undef signal
1783 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1784 {
1785         sig_handler_t old = timer_fn;
1786         if (sig != SIGALRM)
1787                 return signal(sig, handler);
1788         timer_fn = handler;
1789         return old;
1790 }
1791
1792 static const char *make_backslash_path(const char *path)
1793 {
1794         static char buf[PATH_MAX + 1];
1795         char *c;
1796
1797         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1798                 die("Too long path: %.*s", 60, path);
1799
1800         for (c = buf; *c; c++) {
1801                 if (*c == '/')
1802                         *c = '\\';
1803         }
1804         return buf;
1805 }
1806
1807 void mingw_open_html(const char *unixpath)
1808 {
1809         const char *htmlpath = make_backslash_path(unixpath);
1810         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1811                         const char *, const char *, const char *, INT);
1812         T ShellExecute;
1813         HMODULE shell32;
1814         int r;
1815
1816         shell32 = LoadLibrary("shell32.dll");
1817         if (!shell32)
1818                 die("cannot load shell32.dll");
1819         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1820         if (!ShellExecute)
1821                 die("cannot run browser");
1822
1823         printf("Launching default browser to display HTML ...\n");
1824         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1825         FreeLibrary(shell32);
1826         /* see the MSDN documentation referring to the result codes here */
1827         if (r <= 32) {
1828                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1829         }
1830 }
1831
1832 int link(const char *oldpath, const char *newpath)
1833 {
1834         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1835         static T create_hard_link = NULL;
1836         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1837         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1838                 xutftowcs_path(wnewpath, newpath) < 0)
1839                 return -1;
1840
1841         if (!create_hard_link) {
1842                 create_hard_link = (T) GetProcAddress(
1843                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1844                 if (!create_hard_link)
1845                         create_hard_link = (T)-1;
1846         }
1847         if (create_hard_link == (T)-1) {
1848                 errno = ENOSYS;
1849                 return -1;
1850         }
1851         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1852                 errno = err_win_to_posix(GetLastError());
1853                 return -1;
1854         }
1855         return 0;
1856 }
1857
1858 char *getpass(const char *prompt)
1859 {
1860         struct strbuf buf = STRBUF_INIT;
1861
1862         fputs(prompt, stderr);
1863         for (;;) {
1864                 char c = _getch();
1865                 if (c == '\r' || c == '\n')
1866                         break;
1867                 strbuf_addch(&buf, c);
1868         }
1869         fputs("\n", stderr);
1870         return strbuf_detach(&buf, NULL);
1871 }
1872
1873 pid_t waitpid(pid_t pid, int *status, int options)
1874 {
1875         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1876             FALSE, pid);
1877         if (!h) {
1878                 errno = ECHILD;
1879                 return -1;
1880         }
1881
1882         if (pid > 0 && options & WNOHANG) {
1883                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1884                         CloseHandle(h);
1885                         return 0;
1886                 }
1887                 options &= ~WNOHANG;
1888         }
1889
1890         if (options == 0) {
1891                 struct pinfo_t **ppinfo;
1892                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1893                         CloseHandle(h);
1894                         return 0;
1895                 }
1896
1897                 if (status)
1898                         GetExitCodeProcess(h, (LPDWORD)status);
1899
1900                 EnterCriticalSection(&pinfo_cs);
1901
1902                 ppinfo = &pinfo;
1903                 while (*ppinfo) {
1904                         struct pinfo_t *info = *ppinfo;
1905                         if (info->pid == pid) {
1906                                 CloseHandle(info->proc);
1907                                 *ppinfo = info->next;
1908                                 free(info);
1909                                 break;
1910                         }
1911                         ppinfo = &info->next;
1912                 }
1913
1914                 LeaveCriticalSection(&pinfo_cs);
1915
1916                 CloseHandle(h);
1917                 return pid;
1918         }
1919         CloseHandle(h);
1920
1921         errno = EINVAL;
1922         return -1;
1923 }
1924
1925 const char *get_windows_home_directory(void)
1926 {
1927         static const char *home_directory = NULL;
1928         struct strbuf buf = STRBUF_INIT;
1929
1930         if (home_directory)
1931                 return home_directory;
1932
1933         home_directory = getenv("HOME");
1934         if (home_directory && *home_directory)
1935                 return home_directory;
1936
1937         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1938         home_directory = strbuf_detach(&buf, NULL);
1939
1940         return home_directory;
1941 }
1942
1943 int mingw_offset_1st_component(const char *path)
1944 {
1945         int offset = 0;
1946         if (has_dos_drive_prefix(path))
1947                 offset = 2;
1948
1949         /* unc paths */
1950         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1951
1952                 /* skip server name */
1953                 char *pos = strpbrk(path + 2, "\\/");
1954                 if (!pos)
1955                         return 0; /* Error: malformed unc path */
1956
1957                 do {
1958                         pos++;
1959                 } while (*pos && !is_dir_sep(*pos));
1960
1961                 offset = pos - path;
1962         }
1963
1964         return offset + is_dir_sep(path[offset]);
1965 }
1966
1967 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1968 {
1969         int upos = 0, wpos = 0;
1970         const unsigned char *utf = (const unsigned char*) utfs;
1971         if (!utf || !wcs || wcslen < 1) {
1972                 errno = EINVAL;
1973                 return -1;
1974         }
1975         /* reserve space for \0 */
1976         wcslen--;
1977         if (utflen < 0)
1978                 utflen = INT_MAX;
1979
1980         while (upos < utflen) {
1981                 int c = utf[upos++] & 0xff;
1982                 if (utflen == INT_MAX && c == 0)
1983                         break;
1984
1985                 if (wpos >= wcslen) {
1986                         wcs[wpos] = 0;
1987                         errno = ERANGE;
1988                         return -1;
1989                 }
1990
1991                 if (c < 0x80) {
1992                         /* ASCII */
1993                         wcs[wpos++] = c;
1994                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1995                                 (utf[upos] & 0xc0) == 0x80) {
1996                         /* 2-byte utf-8 */
1997                         c = ((c & 0x1f) << 6);
1998                         c |= (utf[upos++] & 0x3f);
1999                         wcs[wpos++] = c;
2000                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2001                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2002                                 (utf[upos] & 0xc0) == 0x80 &&
2003                                 (utf[upos + 1] & 0xc0) == 0x80) {
2004                         /* 3-byte utf-8 */
2005                         c = ((c & 0x0f) << 12);
2006                         c |= ((utf[upos++] & 0x3f) << 6);
2007                         c |= (utf[upos++] & 0x3f);
2008                         wcs[wpos++] = c;
2009                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2010                                 wpos + 1 < wcslen &&
2011                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2012                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2013                                 (utf[upos] & 0xc0) == 0x80 &&
2014                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2015                                 (utf[upos + 2] & 0xc0) == 0x80) {
2016                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2017                         c = ((c & 0x07) << 18);
2018                         c |= ((utf[upos++] & 0x3f) << 12);
2019                         c |= ((utf[upos++] & 0x3f) << 6);
2020                         c |= (utf[upos++] & 0x3f);
2021                         c -= 0x10000;
2022                         wcs[wpos++] = 0xd800 | (c >> 10);
2023                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2024                 } else if (c >= 0xa0) {
2025                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2026                         wcs[wpos++] = c;
2027                 } else {
2028                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2029                         static const char *hex = "0123456789abcdef";
2030                         wcs[wpos++] = hex[c >> 4];
2031                         if (wpos < wcslen)
2032                                 wcs[wpos++] = hex[c & 0x0f];
2033                 }
2034         }
2035         wcs[wpos] = 0;
2036         return wpos;
2037 }
2038
2039 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2040 {
2041         if (!wcs || !utf || utflen < 1) {
2042                 errno = EINVAL;
2043                 return -1;
2044         }
2045         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2046         if (utflen)
2047                 return utflen - 1;
2048         errno = ERANGE;
2049         return -1;
2050 }
2051
2052 /*
2053  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2054  * mingw startup code, see init.c in mingw runtime).
2055  */
2056 int _CRT_glob = 0;
2057
2058 typedef struct {
2059         int newmode;
2060 } _startupinfo;
2061
2062 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2063                 _startupinfo *si);
2064
2065 static NORETURN void die_startup()
2066 {
2067         fputs("fatal: not enough memory for initialization", stderr);
2068         exit(128);
2069 }
2070
2071 static void *malloc_startup(size_t size)
2072 {
2073         void *result = malloc(size);
2074         if (!result)
2075                 die_startup();
2076         return result;
2077 }
2078
2079 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2080 {
2081         len = xwcstoutf(buffer, wcs, len) + 1;
2082         return memcpy(malloc_startup(len), buffer, len);
2083 }
2084
2085 void mingw_startup()
2086 {
2087         int i, maxlen, argc;
2088         char *buffer;
2089         wchar_t **wenv, **wargv;
2090         _startupinfo si;
2091
2092         /* get wide char arguments and environment */
2093         si.newmode = 0;
2094         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2095                 die_startup();
2096
2097         /* determine size of argv and environ conversion buffer */
2098         maxlen = wcslen(_wpgmptr);
2099         for (i = 1; i < argc; i++)
2100                 maxlen = max(maxlen, wcslen(wargv[i]));
2101         for (i = 0; wenv[i]; i++)
2102                 maxlen = max(maxlen, wcslen(wenv[i]));
2103
2104         /*
2105          * nedmalloc can't free CRT memory, allocate resizable environment
2106          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2107          * use it while initializing the environment itself.
2108          */
2109         environ_size = i + 1;
2110         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2111         environ = malloc_startup(environ_alloc);
2112
2113         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2114         maxlen = 3 * maxlen + 1;
2115         buffer = malloc_startup(maxlen);
2116
2117         /* convert command line arguments and environment to UTF-8 */
2118         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2119         for (i = 1; i < argc; i++)
2120                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2121         for (i = 0; wenv[i]; i++)
2122                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2123         environ[i] = NULL;
2124         free(buffer);
2125
2126         /* sort environment for O(log n) getenv / putenv */
2127         qsort(environ, i, sizeof(char*), compareenv);
2128
2129         /* initialize critical section for waitpid pinfo_t list */
2130         InitializeCriticalSection(&pinfo_cs);
2131
2132         /* set up default file mode and file modes for stdin/out/err */
2133         _fmode = _O_BINARY;
2134         _setmode(_fileno(stdin), _O_BINARY);
2135         _setmode(_fileno(stdout), _O_BINARY);
2136         _setmode(_fileno(stderr), _O_BINARY);
2137
2138         /* initialize Unicode console */
2139         winansi_init();
2140 }