compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <wchar.h>
   5 #include "../strbuf.h"
   6 #include "../run-command.h"
   7 #include "../cache.h"
   8
   9 static const int delay[] = { 0, 1, 10, 20, 40 };
  10 unsigned int _CRT_fmode = _O_BINARY;
  11
  12 int err_win_to_posix(DWORD winerr)
  13 {
  14         int error = ENOSYS;
  15         switch(winerr) {
  16         case ERROR_ACCESS_DENIED: error = EACCES; break;
  17         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  18         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  19         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  20         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  21         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  22         case ERROR_BAD_COMMAND: error = EIO; break;
  23         case ERROR_BAD_DEVICE: error = ENODEV; break;
  24         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  25         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  27         case ERROR_BAD_LENGTH: error = EINVAL; break;
  28         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  29         case ERROR_BAD_PIPE: error = EPIPE; break;
  30         case ERROR_BAD_UNIT: error = ENODEV; break;
  31         case ERROR_BAD_USERNAME: error = EINVAL; break;
  32         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  33         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  34         case ERROR_BUSY: error = EBUSY; break;
  35         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  36         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  37         case ERROR_CANNOT_MAKE: error = EACCES; break;
  38         case ERROR_CANTOPEN: error = EIO; break;
  39         case ERROR_CANTREAD: error = EIO; break;
  40         case ERROR_CANTWRITE: error = EIO; break;
  41         case ERROR_CRC: error = EIO; break;
  42         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  43         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  44         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  45         case ERROR_DIRECTORY: error = EINVAL; break;
  46         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  47         case ERROR_DISK_CHANGE: error = EIO; break;
  48         case ERROR_DISK_FULL: error = ENOSPC; break;
  49         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  50         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  51         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  52         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  53         case ERROR_FILE_EXISTS: error = EEXIST; break;
  54         case ERROR_FILE_INVALID: error = ENODEV; break;
  55         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  56         case ERROR_GEN_FAILURE: error = EIO; break;
  57         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  58         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  59         case ERROR_INVALID_ACCESS: error = EACCES; break;
  60         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  61         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  62         case ERROR_INVALID_DATA: error = EINVAL; break;
  63         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  64         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  65         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  66         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  67         case ERROR_INVALID_HANDLE: error = EBADF; break;
  68         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  69         case ERROR_INVALID_NAME: error = EINVAL; break;
  70         case ERROR_INVALID_OWNER: error = EINVAL; break;
  71         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  72         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  73         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  74         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  75         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  76         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  77         case ERROR_IO_DEVICE: error = EIO; break;
  78         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  79         case ERROR_LOCKED: error = EBUSY; break;
  80         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  81         case ERROR_LOGON_FAILURE: error = EACCES; break;
  82         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  83         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  84         case ERROR_MORE_DATA: error = EPIPE; break;
  85         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  86         case ERROR_NOACCESS: error = EFAULT; break;
  87         case ERROR_NONE_MAPPED: error = EINVAL; break;
  88         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  89         case ERROR_NOT_READY: error = EAGAIN; break;
  90         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  91         case ERROR_NO_DATA: error = EPIPE; break;
  92         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  93         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  94         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  95         case ERROR_OPEN_FAILED: error = EIO; break;
  96         case ERROR_OPEN_FILES: error = EBUSY; break;
  97         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  98         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  99         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 100         case ERROR_PATH_BUSY: error = EBUSY; break;
 101         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 102         case ERROR_PIPE_BUSY: error = EBUSY; break;
 103         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 104         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 105         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 106         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 107         case ERROR_READ_FAULT: error = EIO; break;
 108         case ERROR_SEEK: error = EIO; break;
 109         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 110         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 111         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 112         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 113         case ERROR_SWAPERROR: error = ENOENT; break;
 114         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 115         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 116         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 117         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 118         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 119         case ERROR_WRITE_FAULT: error = EIO; break;
 120         case ERROR_WRITE_PROTECT: error = EROFS; break;
 121         }
 122         return error;
 123 }
 124
 125 static inline int is_file_in_use_error(DWORD errcode)
 126 {
 127         switch (errcode) {
 128         case ERROR_SHARING_VIOLATION:
 129         case ERROR_ACCESS_DENIED:
 130                 return 1;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static int read_yes_no_answer(void)
 137 {
 138         char answer[1024];
 139
 140         if (fgets(answer, sizeof(answer), stdin)) {
 141                 size_t answer_len = strlen(answer);
 142                 int got_full_line = 0, c;
 143
 144                 /* remove the newline */
 145                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 146                         answer[answer_len-2] = '\0';
 147                         got_full_line = 1;
 148                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 149                         answer[answer_len-1] = '\0';
 150                         got_full_line = 1;
 151                 }
 152                 /* flush the buffer in case we did not get the full line */
 153                 if (!got_full_line)
 154                         while ((c = getchar()) != EOF && c != '\n')
 155                                 ;
 156         } else
 157                 /* we could not read, return the
 158                  * default answer which is no */
 159                 return 0;
 160
 161         if (tolower(answer[0]) == 'y' && !answer[1])
 162                 return 1;
 163         if (!strncasecmp(answer, "yes", sizeof(answer)))
 164                 return 1;
 165         if (tolower(answer[0]) == 'n' && !answer[1])
 166                 return 0;
 167         if (!strncasecmp(answer, "no", sizeof(answer)))
 168                 return 0;
 169
 170         /* did not find an answer we understand */
 171         return -1;
 172 }
 173
 174 static int ask_yes_no_if_possible(const char *format, ...)
 175 {
 176         char question[4096];
 177         const char *retry_hook[] = { NULL, NULL, NULL };
 178         va_list args;
 179
 180         va_start(args, format);
 181         vsnprintf(question, sizeof(question), format, args);
 182         va_end(args);
 183
 184         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 185                 retry_hook[1] = question;
 186                 return !run_command_v_opt(retry_hook, 0);
 187         }
 188
 189         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 190                 return 0;
 191
 192         while (1) {
 193                 int answer;
 194                 fprintf(stderr, "%s (y/n) ", question);
 195
 196                 if ((answer = read_yes_no_answer()) >= 0)
 197                         return answer;
 198
 199                 fprintf(stderr, "Sorry, I did not understand your answer. "
 200                                 "Please type 'y' or 'n'\n");
 201         }
 202 }
 203
 204 int mingw_unlink(const char *pathname)
 205 {
 206         int ret, tries = 0;
 207         wchar_t wpathname[MAX_PATH];
 208         if (xutftowcs_path(wpathname, pathname) < 0)
 209                 return -1;
 210
 211         /* read-only files cannot be removed */
 212         _wchmod(wpathname, 0666);
 213         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 214                 if (!is_file_in_use_error(GetLastError()))
 215                         break;
 216                 /*
 217                  * We assume that some other process had the source or
 218                  * destination file open at the wrong moment and retry.
 219                  * In order to give the other process a higher chance to
 220                  * complete its operation, we give up our time slice now.
 221                  * If we have to retry again, we do sleep a bit.
 222                  */
 223                 Sleep(delay[tries]);
 224                 tries++;
 225         }
 226         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 227                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 228                         "Should I try again?", pathname))
 229                ret = _wunlink(wpathname);
 230         return ret;
 231 }
 232
 233 static int is_dir_empty(const wchar_t *wpath)
 234 {
 235         WIN32_FIND_DATAW findbuf;
 236         HANDLE handle;
 237         wchar_t wbuf[MAX_PATH + 2];
 238         wcscpy(wbuf, wpath);
 239         wcscat(wbuf, L"\\*");
 240         handle = FindFirstFileW(wbuf, &findbuf);
 241         if (handle == INVALID_HANDLE_VALUE)
 242                 return GetLastError() == ERROR_NO_MORE_FILES;
 243
 244         while (!wcscmp(findbuf.cFileName, L".") ||
 245                         !wcscmp(findbuf.cFileName, L".."))
 246                 if (!FindNextFileW(handle, &findbuf)) {
 247                         DWORD err = GetLastError();
 248                         FindClose(handle);
 249                         return err == ERROR_NO_MORE_FILES;
 250                 }
 251         FindClose(handle);
 252         return 0;
 253 }
 254
 255 int mingw_rmdir(const char *pathname)
 256 {
 257         int ret, tries = 0;
 258         wchar_t wpathname[MAX_PATH];
 259         if (xutftowcs_path(wpathname, pathname) < 0)
 260                 return -1;
 261
 262         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 263                 if (!is_file_in_use_error(GetLastError()))
 264                         break;
 265                 if (!is_dir_empty(wpathname)) {
 266                         errno = ENOTEMPTY;
 267                         break;
 268                 }
 269                 /*
 270                  * We assume that some other process had the source or
 271                  * destination file open at the wrong moment and retry.
 272                  * In order to give the other process a higher chance to
 273                  * complete its operation, we give up our time slice now.
 274                  * If we have to retry again, we do sleep a bit.
 275                  */
 276                 Sleep(delay[tries]);
 277                 tries++;
 278         }
 279         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 280                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 281                         "Should I try again?", pathname))
 282                ret = _wrmdir(wpathname);
 283         return ret;
 284 }
 285
 286 static int make_hidden(const wchar_t *path)
 287 {
 288         DWORD attribs = GetFileAttributesW(path);
 289         if (SetFileAttributesW(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 290                 return 0;
 291         errno = err_win_to_posix(GetLastError());
 292         return -1;
 293 }
 294
 295 void mingw_mark_as_git_dir(const char *dir)
 296 {
 297         wchar_t wdir[MAX_PATH];
 298         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository())
 299                 if (xutftowcs_path(wdir, dir) < 0 || make_hidden(wdir))
 300                         warning("Failed to make '%s' hidden", dir);
 301         git_config_set("core.hideDotFiles",
 302                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 303                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 304                  "dotGitOnly" : "true"));
 305 }
 306
 307 int mingw_mkdir(const char *path, int mode)
 308 {
 309         int ret;
 310         wchar_t wpath[MAX_PATH];
 311         if (xutftowcs_path(wpath, path) < 0)
 312                 return -1;
 313         ret = _wmkdir(wpath);
 314         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 315                 /*
 316                  * In Windows a file or dir starting with a dot is not
 317                  * automatically hidden. So lets mark it as hidden when
 318                  * such a directory is created.
 319                  */
 320                 const char *start = basename((char*)path);
 321                 if (*start == '.')
 322                         return make_hidden(wpath);
 323         }
 324         return ret;
 325 }
 326
 327 int mingw_open (const char *filename, int oflags, ...)
 328 {
 329         va_list args;
 330         unsigned mode;
 331         int fd;
 332         wchar_t wfilename[MAX_PATH];
 333
 334         va_start(args, oflags);
 335         mode = va_arg(args, int);
 336         va_end(args);
 337
 338         if (filename && !strcmp(filename, "/dev/null"))
 339                 filename = "nul";
 340
 341         if (xutftowcs_path(wfilename, filename) < 0)
 342                 return -1;
 343         fd = _wopen(wfilename, oflags, mode);
 344
 345         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 346                 DWORD attrs = GetFileAttributesW(wfilename);
 347                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 348                         errno = EISDIR;
 349         }
 350         if ((oflags & O_CREAT) && fd >= 0 &&
 351             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 352                 /*
 353                  * In Windows a file or dir starting with a dot is not
 354                  * automatically hidden. So lets mark it as hidden when
 355                  * such a file is created.
 356                  */
 357                 const char *start = basename((char*)filename);
 358                 if (*start == '.' && make_hidden(wfilename))
 359                         warning("Could not mark '%s' as hidden.", filename);
 360         }
 361         return fd;
 362 }
 363
 364 #undef write
 365 ssize_t mingw_write(int fd, const void *buf, size_t count)
 366 {
 367         /*
 368          * While write() calls to a file on a local disk are translated
 369          * into WriteFile() calls with a maximum size of 64KB on Windows
 370          * XP and 256KB on Vista, no such cap is placed on writes to
 371          * files over the network on Windows XP.  Unfortunately, there
 372          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 373          * bigger writes fail on Windows XP.
 374          * So we cap to a nice 31MB here to avoid write failures over
 375          * the net without changing the number of WriteFile() calls in
 376          * the local case.
 377          */
 378         return write(fd, buf, min(count, 31 * 1024 * 1024));
 379 }
 380
 381 FILE *mingw_fopen (const char *filename, const char *otype)
 382 {
 383         int hide = 0;
 384         FILE *file;
 385         wchar_t wfilename[MAX_PATH], wotype[4];
 386         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 387             basename((char*)filename)[0] == '.')
 388                 hide = access(filename, F_OK);
 389         if (filename && !strcmp(filename, "/dev/null"))
 390                 filename = "nul";
 391         if (xutftowcs_path(wfilename, filename) < 0 ||
 392                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 393                 return NULL;
 394         file = _wfopen(wfilename, wotype);
 395         if (file && hide && make_hidden(wfilename))
 396                 warning("Could not mark '%s' as hidden.", filename);
 397         return file;
 398 }
 399
 400 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 401 {
 402         int hide = 0;
 403         FILE *file;
 404         wchar_t wfilename[MAX_PATH], wotype[4];
 405         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 406             basename((char*)filename)[0] == '.')
 407                 hide = access(filename, F_OK);
 408         if (filename && !strcmp(filename, "/dev/null"))
 409                 filename = "nul";
 410         if (xutftowcs_path(wfilename, filename) < 0 ||
 411                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 412                 return NULL;
 413         file = _wfreopen(wfilename, wotype, stream);
 414         if (file && hide && make_hidden(wfilename))
 415                 warning("Could not mark '%s' as hidden.", filename);
 416         return file;
 417 }
 418
 419 int mingw_access(const char *filename, int mode)
 420 {
 421         wchar_t wfilename[MAX_PATH];
 422         if (xutftowcs_path(wfilename, filename) < 0)
 423                 return -1;
 424         /* X_OK is not supported by the MSVCRT version */
 425         return _waccess(wfilename, mode & ~X_OK);
 426 }
 427
 428 int mingw_chdir(const char *dirname)
 429 {
 430         wchar_t wdirname[MAX_PATH];
 431         if (xutftowcs_path(wdirname, dirname) < 0)
 432                 return -1;
 433         return _wchdir(wdirname);
 434 }
 435
 436 int mingw_chmod(const char *filename, int mode)
 437 {
 438         wchar_t wfilename[MAX_PATH];
 439         if (xutftowcs_path(wfilename, filename) < 0)
 440                 return -1;
 441         return _wchmod(wfilename, mode);
 442 }
 443
 444 /*
 445  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 446  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 447  */
 448 static inline long long filetime_to_hnsec(const FILETIME *ft)
 449 {
 450         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 451         /* Windows to Unix Epoch conversion */
 452         return winTime - 116444736000000000LL;
 453 }
 454
 455 static inline time_t filetime_to_time_t(const FILETIME *ft)
 456 {
 457         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 458 }
 459
 460 /* We keep the do_lstat code in a separate function to avoid recursion.
 461  * When a path ends with a slash, the stat will fail with ENOENT. In
 462  * this case, we strip the trailing slashes and stat again.
 463  *
 464  * If follow is true then act like stat() and report on the link
 465  * target. Otherwise report on the link itself.
 466  */
 467 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 468 {
 469         WIN32_FILE_ATTRIBUTE_DATA fdata;
 470         wchar_t wfilename[MAX_PATH];
 471         if (xutftowcs_path(wfilename, file_name) < 0)
 472                 return -1;
 473
 474         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 475                 buf->st_ino = 0;
 476                 buf->st_gid = 0;
 477                 buf->st_uid = 0;
 478                 buf->st_nlink = 1;
 479                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 480                 buf->st_size = fdata.nFileSizeLow |
 481                         (((off_t)fdata.nFileSizeHigh)<<32);
 482                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 483                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 484                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 485                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 486                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 487                         WIN32_FIND_DATAW findbuf;
 488                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 489                         if (handle != INVALID_HANDLE_VALUE) {
 490                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 491                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 492                                         if (follow) {
 493                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 494                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 495                                         } else {
 496                                                 buf->st_mode = S_IFLNK;
 497                                         }
 498                                         buf->st_mode |= S_IREAD;
 499                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 500                                                 buf->st_mode |= S_IWRITE;
 501                                 }
 502                                 FindClose(handle);
 503                         }
 504                 }
 505                 return 0;
 506         }
 507         switch (GetLastError()) {
 508         case ERROR_ACCESS_DENIED:
 509         case ERROR_SHARING_VIOLATION:
 510         case ERROR_LOCK_VIOLATION:
 511         case ERROR_SHARING_BUFFER_EXCEEDED:
 512                 errno = EACCES;
 513                 break;
 514         case ERROR_BUFFER_OVERFLOW:
 515                 errno = ENAMETOOLONG;
 516                 break;
 517         case ERROR_NOT_ENOUGH_MEMORY:
 518                 errno = ENOMEM;
 519                 break;
 520         default:
 521                 errno = ENOENT;
 522                 break;
 523         }
 524         return -1;
 525 }
 526
 527 /* We provide our own lstat/fstat functions, since the provided
 528  * lstat/fstat functions are so slow. These stat functions are
 529  * tailored for Git's usage (read: fast), and are not meant to be
 530  * complete. Note that Git stat()s are redirected to mingw_lstat()
 531  * too, since Windows doesn't really handle symlinks that well.
 532  */
 533 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 534 {
 535         int namelen;
 536         char alt_name[PATH_MAX];
 537
 538         if (!do_lstat(follow, file_name, buf))
 539                 return 0;
 540
 541         /* if file_name ended in a '/', Windows returned ENOENT;
 542          * try again without trailing slashes
 543          */
 544         if (errno != ENOENT)
 545                 return -1;
 546
 547         namelen = strlen(file_name);
 548         if (namelen && file_name[namelen-1] != '/')
 549                 return -1;
 550         while (namelen && file_name[namelen-1] == '/')
 551                 --namelen;
 552         if (!namelen || namelen >= PATH_MAX)
 553                 return -1;
 554
 555         memcpy(alt_name, file_name, namelen);
 556         alt_name[namelen] = 0;
 557         return do_lstat(follow, alt_name, buf);
 558 }
 559
 560 int mingw_lstat(const char *file_name, struct stat *buf)
 561 {
 562         return do_stat_internal(0, file_name, buf);
 563 }
 564 int mingw_stat(const char *file_name, struct stat *buf)
 565 {
 566         return do_stat_internal(1, file_name, buf);
 567 }
 568
 569 #undef fstat
 570 int mingw_fstat(int fd, struct stat *buf)
 571 {
 572         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 573         BY_HANDLE_FILE_INFORMATION fdata;
 574
 575         if (fh == INVALID_HANDLE_VALUE) {
 576                 errno = EBADF;
 577                 return -1;
 578         }
 579         /* direct non-file handles to MS's fstat() */
 580         if (GetFileType(fh) != FILE_TYPE_DISK)
 581                 return _fstati64(fd, buf);
 582
 583         if (GetFileInformationByHandle(fh, &fdata)) {
 584                 buf->st_ino = 0;
 585                 buf->st_gid = 0;
 586                 buf->st_uid = 0;
 587                 buf->st_nlink = 1;
 588                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 589                 buf->st_size = fdata.nFileSizeLow |
 590                         (((off_t)fdata.nFileSizeHigh)<<32);
 591                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 592                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 593                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 594                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 595                 return 0;
 596         }
 597         errno = EBADF;
 598         return -1;
 599 }
 600
 601 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 602 {
 603         long long winTime = t * 10000000LL + 116444736000000000LL;
 604         ft->dwLowDateTime = winTime;
 605         ft->dwHighDateTime = winTime >> 32;
 606 }
 607
 608 int mingw_utime (const char *file_name, const struct utimbuf *times)
 609 {
 610         FILETIME mft, aft;
 611         int fh, rc;
 612         DWORD attrs;
 613         wchar_t wfilename[MAX_PATH];
 614         if (xutftowcs_path(wfilename, file_name) < 0)
 615                 return -1;
 616
 617         /* must have write permission */
 618         attrs = GetFileAttributesW(wfilename);
 619         if (attrs != INVALID_FILE_ATTRIBUTES &&
 620             (attrs & FILE_ATTRIBUTE_READONLY)) {
 621                 /* ignore errors here; open() will report them */
 622                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 623         }
 624
 625         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 626                 rc = -1;
 627                 goto revert_attrs;
 628         }
 629
 630         if (times) {
 631                 time_t_to_filetime(times->modtime, &mft);
 632                 time_t_to_filetime(times->actime, &aft);
 633         } else {
 634                 GetSystemTimeAsFileTime(&mft);
 635                 aft = mft;
 636         }
 637         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 638                 errno = EINVAL;
 639                 rc = -1;
 640         } else
 641                 rc = 0;
 642         close(fh);
 643
 644 revert_attrs:
 645         if (attrs != INVALID_FILE_ATTRIBUTES &&
 646             (attrs & FILE_ATTRIBUTE_READONLY)) {
 647                 /* ignore errors again */
 648                 SetFileAttributesW(wfilename, attrs);
 649         }
 650         return rc;
 651 }
 652
 653 unsigned int sleep (unsigned int seconds)
 654 {
 655         Sleep(seconds*1000);
 656         return 0;
 657 }
 658
 659 char *mingw_mktemp(char *template)
 660 {
 661         wchar_t wtemplate[MAX_PATH];
 662         if (xutftowcs_path(wtemplate, template) < 0)
 663                 return NULL;
 664         if (!_wmktemp(wtemplate))
 665                 return NULL;
 666         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 667                 return NULL;
 668         return template;
 669 }
 670
 671 int mkstemp(char *template)
 672 {
 673         char *filename = mktemp(template);
 674         if (filename == NULL)
 675                 return -1;
 676         return open(filename, O_RDWR | O_CREAT, 0600);
 677 }
 678
 679 int gettimeofday(struct timeval *tv, void *tz)
 680 {
 681         FILETIME ft;
 682         long long hnsec;
 683
 684         GetSystemTimeAsFileTime(&ft);
 685         hnsec = filetime_to_hnsec(&ft);
 686         tv->tv_sec = hnsec / 10000000;
 687         tv->tv_usec = (hnsec % 10000000) / 10;
 688         return 0;
 689 }
 690
 691 int pipe(int filedes[2])
 692 {
 693         HANDLE h[2];
 694
 695         /* this creates non-inheritable handles */
 696         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 697                 errno = err_win_to_posix(GetLastError());
 698                 return -1;
 699         }
 700         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 701         if (filedes[0] < 0) {
 702                 CloseHandle(h[0]);
 703                 CloseHandle(h[1]);
 704                 return -1;
 705         }
 706         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 707         if (filedes[0] < 0) {
 708                 close(filedes[0]);
 709                 CloseHandle(h[1]);
 710                 return -1;
 711         }
 712         return 0;
 713 }
 714
 715 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 716 {
 717         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 718         memcpy(result, gmtime(timep), sizeof(struct tm));
 719         return result;
 720 }
 721
 722 struct tm *localtime_r(const time_t *timep, struct tm *result)
 723 {
 724         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 725         memcpy(result, localtime(timep), sizeof(struct tm));
 726         return result;
 727 }
 728
 729 char *mingw_getcwd(char *pointer, int len)
 730 {
 731         int i;
 732         wchar_t wpointer[MAX_PATH];
 733         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 734                 return NULL;
 735         if (xwcstoutf(pointer, wpointer, len) < 0)
 736                 return NULL;
 737         for (i = 0; pointer[i]; i++)
 738                 if (pointer[i] == '\\')
 739                         pointer[i] = '/';
 740         return pointer;
 741 }
 742
 743 /*
 744  * Compare environment entries by key (i.e. stopping at '=' or '\0').
 745  */
 746 static int compareenv(const void *v1, const void *v2)
 747 {
 748         const char *e1 = *(const char**)v1;
 749         const char *e2 = *(const char**)v2;
 750
 751         for (;;) {
 752                 int c1 = *e1++;
 753                 int c2 = *e2++;
 754                 c1 = (c1 == '=') ? 0 : tolower(c1);
 755                 c2 = (c2 == '=') ? 0 : tolower(c2);
 756                 if (c1 > c2)
 757                         return 1;
 758                 if (c1 < c2)
 759                         return -1;
 760                 if (c1 == 0)
 761                         return 0;
 762         }
 763 }
 764
 765 static int bsearchenv(char **env, const char *name, size_t size)
 766 {
 767         unsigned low = 0, high = size;
 768         while (low < high) {
 769                 unsigned mid = low + ((high - low) >> 1);
 770                 int cmp = compareenv(&env[mid], &name);
 771                 if (cmp < 0)
 772                         low = mid + 1;
 773                 else if (cmp > 0)
 774                         high = mid;
 775                 else
 776                         return mid;
 777         }
 778         return ~low; /* not found, return 1's complement of insert position */
 779 }
 780
 781 /*
 782  * If name contains '=', then sets the variable, otherwise it unsets it
 783  * Size includes the terminating NULL. Env must have room for size + 1 entries
 784  * (in case of insert). Returns the new size. Optionally frees removed entries.
 785  */
 786 static int do_putenv(char **env, const char *name, int size, int free_old)
 787 {
 788         int i = bsearchenv(env, name, size - 1);
 789
 790         /* optionally free removed / replaced entry */
 791         if (i >= 0 && free_old)
 792                 free(env[i]);
 793
 794         if (strchr(name, '=')) {
 795                 /* if new value ('key=value') is specified, insert or replace entry */
 796                 if (i < 0) {
 797                         i = ~i;
 798                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
 799                         size++;
 800                 }
 801                 env[i] = (char*) name;
 802         } else if (i >= 0) {
 803                 /* otherwise ('key') remove existing entry */
 804                 size--;
 805                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
 806         }
 807         return size;
 808 }
 809
 810 /* used number of elements of environ array, including terminating NULL */
 811 static int environ_size = 0;
 812 /* allocated size of environ array, in bytes */
 813 static int environ_alloc = 0;
 814
 815 char *mingw_getenv(const char *name)
 816 {
 817         char *value;
 818         int pos = bsearchenv(environ, name, environ_size - 1);
 819         if (pos < 0)
 820                 return NULL;
 821         value = strchr(environ[pos], '=');
 822         return value ? &value[1] : NULL;
 823 }
 824
 825 int mingw_putenv(const char *namevalue)
 826 {
 827         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
 828         environ_size = do_putenv(environ, namevalue, environ_size, 1);
 829         return 0;
 830 }
 831
 832 /*
 833  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 834  * (Parsing C++ Command-Line Arguments)
 835  */
 836 static const char *quote_arg(const char *arg)
 837 {
 838         /* count chars to quote */
 839         int len = 0, n = 0;
 840         int force_quotes = 0;
 841         char *q, *d;
 842         const char *p = arg;
 843         if (!*p) force_quotes = 1;
 844         while (*p) {
 845                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 846                         force_quotes = 1;
 847                 else if (*p == '"')
 848                         n++;
 849                 else if (*p == '\\') {
 850                         int count = 0;
 851                         while (*p == '\\') {
 852                                 count++;
 853                                 p++;
 854                                 len++;
 855                         }
 856                         if (*p == '"')
 857                                 n += count*2 + 1;
 858                         continue;
 859                 }
 860                 len++;
 861                 p++;
 862         }
 863         if (!force_quotes && n == 0)
 864                 return arg;
 865
 866         /* insert \ where necessary */
 867         d = q = xmalloc(len+n+3);
 868         *d++ = '"';
 869         while (*arg) {
 870                 if (*arg == '"')
 871                         *d++ = '\\';
 872                 else if (*arg == '\\') {
 873                         int count = 0;
 874                         while (*arg == '\\') {
 875                                 count++;
 876                                 *d++ = *arg++;
 877                         }
 878                         if (*arg == '"') {
 879                                 while (count-- > 0)
 880                                         *d++ = '\\';
 881                                 *d++ = '\\';
 882                         }
 883                 }
 884                 *d++ = *arg++;
 885         }
 886         *d++ = '"';
 887         *d++ = 0;
 888         return q;
 889 }
 890
 891 static const char *parse_interpreter(const char *cmd)
 892 {
 893         static char buf[100];
 894         char *p, *opt;
 895         int n, fd;
 896
 897         /* don't even try a .exe */
 898         n = strlen(cmd);
 899         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 900                 return NULL;
 901
 902         fd = open(cmd, O_RDONLY);
 903         if (fd < 0)
 904                 return NULL;
 905         n = read(fd, buf, sizeof(buf)-1);
 906         close(fd);
 907         if (n < 4)      /* at least '#!/x' and not error */
 908                 return NULL;
 909
 910         if (buf[0] != '#' || buf[1] != '!')
 911                 return NULL;
 912         buf[n] = '\0';
 913         p = buf + strcspn(buf, "\r\n");
 914         if (!*p)
 915                 return NULL;
 916
 917         *p = '\0';
 918         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 919                 return NULL;
 920         /* strip options */
 921         if ((opt = strchr(p+1, ' ')))
 922                 *opt = '\0';
 923         return p+1;
 924 }
 925
 926 /*
 927  * Splits the PATH into parts.
 928  */
 929 static char **get_path_split(void)
 930 {
 931         char *p, **path, *envpath = getenv("PATH");
 932         int i, n = 0;
 933
 934         if (!envpath || !*envpath)
 935                 return NULL;
 936
 937         envpath = xstrdup(envpath);
 938         p = envpath;
 939         while (p) {
 940                 char *dir = p;
 941                 p = strchr(p, ';');
 942                 if (p) *p++ = '\0';
 943                 if (*dir) {     /* not earlier, catches series of ; */
 944                         ++n;
 945                 }
 946         }
 947         if (!n)
 948                 return NULL;
 949
 950         path = xmalloc((n+1)*sizeof(char *));
 951         p = envpath;
 952         i = 0;
 953         do {
 954                 if (*p)
 955                         path[i++] = xstrdup(p);
 956                 p = p+strlen(p)+1;
 957         } while (i < n);
 958         path[i] = NULL;
 959
 960         free(envpath);
 961
 962         return path;
 963 }
 964
 965 static void free_path_split(char **path)
 966 {
 967         char **p = path;
 968
 969         if (!path)
 970                 return;
 971
 972         while (*p)
 973                 free(*p++);
 974         free(path);
 975 }
 976
 977 /*
 978  * exe_only means that we only want to detect .exe files, but not scripts
 979  * (which do not have an extension)
 980  */
 981 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 982 {
 983         char path[MAX_PATH];
 984         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 985
 986         if (!isexe && access(path, F_OK) == 0)
 987                 return xstrdup(path);
 988         path[strlen(path)-4] = '\0';
 989         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 990                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 991                         return xstrdup(path);
 992         return NULL;
 993 }
 994
 995 /*
 996  * Determines the absolute path of cmd using the split path in path.
 997  * If cmd contains a slash or backslash, no lookup is performed.
 998  */
 999 static char *path_lookup(const char *cmd, char **path, int exe_only)
1000 {
1001         char *prog = NULL;
1002         int len = strlen(cmd);
1003         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1004
1005         if (strchr(cmd, '/') || strchr(cmd, '\\'))
1006                 prog = xstrdup(cmd);
1007
1008         while (!prog && *path)
1009                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
1010
1011         return prog;
1012 }
1013
1014 /*
1015  * Create environment block suitable for CreateProcess. Merges current
1016  * process environment and the supplied environment changes.
1017  */
1018 static wchar_t *make_environment_block(char **deltaenv)
1019 {
1020         wchar_t *wenvblk = NULL;
1021         char **tmpenv;
1022         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1023
1024         while (deltaenv && deltaenv[i])
1025                 i++;
1026
1027         /* copy the environment, leaving space for changes */
1028         tmpenv = xmalloc((size + i) * sizeof(char*));
1029         memcpy(tmpenv, environ, size * sizeof(char*));
1030
1031         /* merge supplied environment changes into the temporary environment */
1032         for (i = 0; deltaenv && deltaenv[i]; i++)
1033                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1034
1035         /* create environment block from temporary environment */
1036         for (i = 0; tmpenv[i]; i++) {
1037                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1038                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1039                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1040         }
1041         /* add final \0 terminator */
1042         wenvblk[wenvpos] = 0;
1043         free(tmpenv);
1044         return wenvblk;
1045 }
1046
1047 struct pinfo_t {
1048         struct pinfo_t *next;
1049         pid_t pid;
1050         HANDLE proc;
1051 } pinfo_t;
1052 struct pinfo_t *pinfo = NULL;
1053 CRITICAL_SECTION pinfo_cs;
1054
1055 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1056                               const char *dir,
1057                               int prepend_cmd, int fhin, int fhout, int fherr)
1058 {
1059         STARTUPINFOW si;
1060         PROCESS_INFORMATION pi;
1061         struct strbuf args;
1062         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1063         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1064         BOOL ret;
1065
1066         /* Determine whether or not we are associated to a console */
1067         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1068                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1069                         FILE_ATTRIBUTE_NORMAL, NULL);
1070         if (cons == INVALID_HANDLE_VALUE) {
1071                 /* There is no console associated with this process.
1072                  * Since the child is a console process, Windows
1073                  * would normally create a console window. But
1074                  * since we'll be redirecting std streams, we do
1075                  * not need the console.
1076                  * It is necessary to use DETACHED_PROCESS
1077                  * instead of CREATE_NO_WINDOW to make ssh
1078                  * recognize that it has no console.
1079                  */
1080                 flags |= DETACHED_PROCESS;
1081         } else {
1082                 /* There is already a console. If we specified
1083                  * DETACHED_PROCESS here, too, Windows would
1084                  * disassociate the child from the console.
1085                  * The same is true for CREATE_NO_WINDOW.
1086                  * Go figure!
1087                  */
1088                 CloseHandle(cons);
1089         }
1090         memset(&si, 0, sizeof(si));
1091         si.cb = sizeof(si);
1092         si.dwFlags = STARTF_USESTDHANDLES;
1093         si.hStdInput = winansi_get_osfhandle(fhin);
1094         si.hStdOutput = winansi_get_osfhandle(fhout);
1095         si.hStdError = winansi_get_osfhandle(fherr);
1096
1097         if (xutftowcs_path(wcmd, cmd) < 0)
1098                 return -1;
1099         if (dir && xutftowcs_path(wdir, dir) < 0)
1100                 return -1;
1101
1102         /* concatenate argv, quoting args as we go */
1103         strbuf_init(&args, 0);
1104         if (prepend_cmd) {
1105                 char *quoted = (char *)quote_arg(cmd);
1106                 strbuf_addstr(&args, quoted);
1107                 if (quoted != cmd)
1108                         free(quoted);
1109         }
1110         for (; *argv; argv++) {
1111                 char *quoted = (char *)quote_arg(*argv);
1112                 if (*args.buf)
1113                         strbuf_addch(&args, ' ');
1114                 strbuf_addstr(&args, quoted);
1115                 if (quoted != *argv)
1116                         free(quoted);
1117         }
1118
1119         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1120         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1121         strbuf_release(&args);
1122
1123         wenvblk = make_environment_block(deltaenv);
1124
1125         memset(&pi, 0, sizeof(pi));
1126         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1127                 wenvblk, dir ? wdir : NULL, &si, &pi);
1128
1129         free(wenvblk);
1130         free(wargs);
1131
1132         if (!ret) {
1133                 errno = ENOENT;
1134                 return -1;
1135         }
1136         CloseHandle(pi.hThread);
1137
1138         /*
1139          * The process ID is the human-readable identifier of the process
1140          * that we want to present in log and error messages. The handle
1141          * is not useful for this purpose. But we cannot close it, either,
1142          * because it is not possible to turn a process ID into a process
1143          * handle after the process terminated.
1144          * Keep the handle in a list for waitpid.
1145          */
1146         EnterCriticalSection(&pinfo_cs);
1147         {
1148                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1149                 info->pid = pi.dwProcessId;
1150                 info->proc = pi.hProcess;
1151                 info->next = pinfo;
1152                 pinfo = info;
1153         }
1154         LeaveCriticalSection(&pinfo_cs);
1155
1156         return (pid_t)pi.dwProcessId;
1157 }
1158
1159 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1160 {
1161         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1162 }
1163
1164 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1165                      const char *dir,
1166                      int fhin, int fhout, int fherr)
1167 {
1168         pid_t pid;
1169         char **path = get_path_split();
1170         char *prog = path_lookup(cmd, path, 0);
1171
1172         if (!prog) {
1173                 errno = ENOENT;
1174                 pid = -1;
1175         }
1176         else {
1177                 const char *interpr = parse_interpreter(prog);
1178
1179                 if (interpr) {
1180                         const char *argv0 = argv[0];
1181                         char *iprog = path_lookup(interpr, path, 1);
1182                         argv[0] = prog;
1183                         if (!iprog) {
1184                                 errno = ENOENT;
1185                                 pid = -1;
1186                         }
1187                         else {
1188                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1189                                                        fhin, fhout, fherr);
1190                                 free(iprog);
1191                         }
1192                         argv[0] = argv0;
1193                 }
1194                 else
1195                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1196                                                fhin, fhout, fherr);
1197                 free(prog);
1198         }
1199         free_path_split(path);
1200         return pid;
1201 }
1202
1203 static int try_shell_exec(const char *cmd, char *const *argv)
1204 {
1205         const char *interpr = parse_interpreter(cmd);
1206         char **path;
1207         char *prog;
1208         int pid = 0;
1209
1210         if (!interpr)
1211                 return 0;
1212         path = get_path_split();
1213         prog = path_lookup(interpr, path, 1);
1214         if (prog) {
1215                 int argc = 0;
1216                 const char **argv2;
1217                 while (argv[argc]) argc++;
1218                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1219                 argv2[0] = (char *)cmd; /* full path to the script file */
1220                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1221                 pid = mingw_spawnv(prog, argv2, 1);
1222                 if (pid >= 0) {
1223                         int status;
1224                         if (waitpid(pid, &status, 0) < 0)
1225                                 status = 255;
1226                         exit(status);
1227                 }
1228                 pid = 1;        /* indicate that we tried but failed */
1229                 free(prog);
1230                 free(argv2);
1231         }
1232         free_path_split(path);
1233         return pid;
1234 }
1235
1236 void mingw_execv(const char *cmd, char *const *argv)
1237 {
1238         /* check if git_command is a shell script */
1239         if (!try_shell_exec(cmd, argv)) {
1240                 int pid, status;
1241
1242                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1243                 if (pid < 0)
1244                         return;
1245                 if (waitpid(pid, &status, 0) < 0)
1246                         status = 255;
1247                 exit(status);
1248         }
1249 }
1250
1251 int mingw_execvp(const char *cmd, char *const *argv)
1252 {
1253         char **path = get_path_split();
1254         char *prog = path_lookup(cmd, path, 0);
1255
1256         if (prog) {
1257                 mingw_execv(prog, argv);
1258                 free(prog);
1259         } else
1260                 errno = ENOENT;
1261
1262         free_path_split(path);
1263         return -1;
1264 }
1265
1266 int mingw_kill(pid_t pid, int sig)
1267 {
1268         if (pid > 0 && sig == SIGTERM) {
1269                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1270
1271                 if (TerminateProcess(h, -1)) {
1272                         CloseHandle(h);
1273                         return 0;
1274                 }
1275
1276                 errno = err_win_to_posix(GetLastError());
1277                 CloseHandle(h);
1278                 return -1;
1279         }
1280
1281         errno = EINVAL;
1282         return -1;
1283 }
1284
1285 /*
1286  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1287  * that service contains a numerical port, or that it is null. It
1288  * does a simple search using gethostbyname, and returns one IPv4 host
1289  * if one was found.
1290  */
1291 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1292                                    const struct addrinfo *hints,
1293                                    struct addrinfo **res)
1294 {
1295         struct hostent *h = NULL;
1296         struct addrinfo *ai;
1297         struct sockaddr_in *sin;
1298
1299         if (node) {
1300                 h = gethostbyname(node);
1301                 if (!h)
1302                         return WSAGetLastError();
1303         }
1304
1305         ai = xmalloc(sizeof(struct addrinfo));
1306         *res = ai;
1307         ai->ai_flags = 0;
1308         ai->ai_family = AF_INET;
1309         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1310         switch (ai->ai_socktype) {
1311         case SOCK_STREAM:
1312                 ai->ai_protocol = IPPROTO_TCP;
1313                 break;
1314         case SOCK_DGRAM:
1315                 ai->ai_protocol = IPPROTO_UDP;
1316                 break;
1317         default:
1318                 ai->ai_protocol = 0;
1319                 break;
1320         }
1321         ai->ai_addrlen = sizeof(struct sockaddr_in);
1322         if (hints && (hints->ai_flags & AI_CANONNAME))
1323                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1324         else
1325                 ai->ai_canonname = NULL;
1326
1327         sin = xmalloc(ai->ai_addrlen);
1328         memset(sin, 0, ai->ai_addrlen);
1329         sin->sin_family = AF_INET;
1330         /* Note: getaddrinfo is supposed to allow service to be a string,
1331          * which should be looked up using getservbyname. This is
1332          * currently not implemented */
1333         if (service)
1334                 sin->sin_port = htons(atoi(service));
1335         if (h)
1336                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1337         else if (hints && (hints->ai_flags & AI_PASSIVE))
1338                 sin->sin_addr.s_addr = INADDR_ANY;
1339         else
1340                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1341         ai->ai_addr = (struct sockaddr *)sin;
1342         ai->ai_next = 0;
1343         return 0;
1344 }
1345
1346 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1347 {
1348         free(res->ai_canonname);
1349         free(res->ai_addr);
1350         free(res);
1351 }
1352
1353 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1354                                    char *host, DWORD hostlen,
1355                                    char *serv, DWORD servlen, int flags)
1356 {
1357         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1358         if (sa->sa_family != AF_INET)
1359                 return EAI_FAMILY;
1360         if (!host && !serv)
1361                 return EAI_NONAME;
1362
1363         if (host && hostlen > 0) {
1364                 struct hostent *ent = NULL;
1365                 if (!(flags & NI_NUMERICHOST))
1366                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1367                                             sizeof(sin->sin_addr), AF_INET);
1368
1369                 if (ent)
1370                         snprintf(host, hostlen, "%s", ent->h_name);
1371                 else if (flags & NI_NAMEREQD)
1372                         return EAI_NONAME;
1373                 else
1374                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1375         }
1376
1377         if (serv && servlen > 0) {
1378                 struct servent *ent = NULL;
1379                 if (!(flags & NI_NUMERICSERV))
1380                         ent = getservbyport(sin->sin_port,
1381                                             flags & NI_DGRAM ? "udp" : "tcp");
1382
1383                 if (ent)
1384                         snprintf(serv, servlen, "%s", ent->s_name);
1385                 else
1386                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1387         }
1388
1389         return 0;
1390 }
1391
1392 static HMODULE ipv6_dll = NULL;
1393 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1394 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1395                                       const struct addrinfo *hints,
1396                                       struct addrinfo **res);
1397 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1398                                       char *host, DWORD hostlen,
1399                                       char *serv, DWORD servlen, int flags);
1400 /*
1401  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1402  * don't need to try to load that one dynamically.
1403  */
1404
1405 static void socket_cleanup(void)
1406 {
1407         WSACleanup();
1408         if (ipv6_dll)
1409                 FreeLibrary(ipv6_dll);
1410         ipv6_dll = NULL;
1411         ipv6_freeaddrinfo = freeaddrinfo_stub;
1412         ipv6_getaddrinfo = getaddrinfo_stub;
1413         ipv6_getnameinfo = getnameinfo_stub;
1414 }
1415
1416 static void ensure_socket_initialization(void)
1417 {
1418         WSADATA wsa;
1419         static int initialized = 0;
1420         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1421         const char **name;
1422
1423         if (initialized)
1424                 return;
1425
1426         if (WSAStartup(MAKEWORD(2,2), &wsa))
1427                 die("unable to initialize winsock subsystem, error %d",
1428                         WSAGetLastError());
1429
1430         for (name = libraries; *name; name++) {
1431                 ipv6_dll = LoadLibrary(*name);
1432                 if (!ipv6_dll)
1433                         continue;
1434
1435                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1436                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1437                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1438                                                    const struct addrinfo *,
1439                                                    struct addrinfo **))
1440                         GetProcAddress(ipv6_dll, "getaddrinfo");
1441                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1442                                                    socklen_t, char *, DWORD,
1443                                                    char *, DWORD, int))
1444                         GetProcAddress(ipv6_dll, "getnameinfo");
1445                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1446                         FreeLibrary(ipv6_dll);
1447                         ipv6_dll = NULL;
1448                 } else
1449                         break;
1450         }
1451         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1452                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1453                 ipv6_getaddrinfo = getaddrinfo_stub;
1454                 ipv6_getnameinfo = getnameinfo_stub;
1455         }
1456
1457         atexit(socket_cleanup);
1458         initialized = 1;
1459 }
1460
1461 #undef gethostname
1462 int mingw_gethostname(char *name, int namelen)
1463 {
1464     ensure_socket_initialization();
1465     return gethostname(name, namelen);
1466 }
1467
1468 #undef gethostbyname
1469 struct hostent *mingw_gethostbyname(const char *host)
1470 {
1471         ensure_socket_initialization();
1472         return gethostbyname(host);
1473 }
1474
1475 void mingw_freeaddrinfo(struct addrinfo *res)
1476 {
1477         ipv6_freeaddrinfo(res);
1478 }
1479
1480 int mingw_getaddrinfo(const char *node, const char *service,
1481                       const struct addrinfo *hints, struct addrinfo **res)
1482 {
1483         ensure_socket_initialization();
1484         return ipv6_getaddrinfo(node, service, hints, res);
1485 }
1486
1487 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1488                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1489                       int flags)
1490 {
1491         ensure_socket_initialization();
1492         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1493 }
1494
1495 int mingw_socket(int domain, int type, int protocol)
1496 {
1497         int sockfd;
1498         SOCKET s;
1499
1500         ensure_socket_initialization();
1501         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1502         if (s == INVALID_SOCKET) {
1503                 /*
1504                  * WSAGetLastError() values are regular BSD error codes
1505                  * biased by WSABASEERR.
1506                  * However, strerror() does not know about networking
1507                  * specific errors, which are values beginning at 38 or so.
1508                  * Therefore, we choose to leave the biased error code
1509                  * in errno so that _if_ someone looks up the code somewhere,
1510                  * then it is at least the number that are usually listed.
1511                  */
1512                 errno = WSAGetLastError();
1513                 return -1;
1514         }
1515         /* convert into a file descriptor */
1516         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1517                 closesocket(s);
1518                 return error("unable to make a socket file descriptor: %s",
1519                         strerror(errno));
1520         }
1521         return sockfd;
1522 }
1523
1524 #undef connect
1525 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1526 {
1527         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1528         return connect(s, sa, sz);
1529 }
1530
1531 #undef bind
1532 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1533 {
1534         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1535         return bind(s, sa, sz);
1536 }
1537
1538 #undef setsockopt
1539 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1540 {
1541         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1542         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1543 }
1544
1545 #undef shutdown
1546 int mingw_shutdown(int sockfd, int how)
1547 {
1548         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1549         return shutdown(s, how);
1550 }
1551
1552 #undef listen
1553 int mingw_listen(int sockfd, int backlog)
1554 {
1555         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1556         return listen(s, backlog);
1557 }
1558
1559 #undef accept
1560 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1561 {
1562         int sockfd2;
1563
1564         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1565         SOCKET s2 = accept(s1, sa, sz);
1566
1567         /* convert into a file descriptor */
1568         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1569                 int err = errno;
1570                 closesocket(s2);
1571                 return error("unable to make a socket file descriptor: %s",
1572                         strerror(err));
1573         }
1574         return sockfd2;
1575 }
1576
1577 #undef rename
1578 int mingw_rename(const char *pold, const char *pnew)
1579 {
1580         DWORD attrs, gle;
1581         int tries = 0;
1582         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1583         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1584                 return -1;
1585
1586         /*
1587          * Try native rename() first to get errno right.
1588          * It is based on MoveFile(), which cannot overwrite existing files.
1589          */
1590         if (!_wrename(wpold, wpnew))
1591                 return 0;
1592         if (errno != EEXIST)
1593                 return -1;
1594 repeat:
1595         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1596                 return 0;
1597         /* TODO: translate more errors */
1598         gle = GetLastError();
1599         if (gle == ERROR_ACCESS_DENIED &&
1600             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1601                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1602                         errno = EISDIR;
1603                         return -1;
1604                 }
1605                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1606                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1607                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1608                                 return 0;
1609                         gle = GetLastError();
1610                         /* revert file attributes on failure */
1611                         SetFileAttributesW(wpnew, attrs);
1612                 }
1613         }
1614         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1615                 /*
1616                  * We assume that some other process had the source or
1617                  * destination file open at the wrong moment and retry.
1618                  * In order to give the other process a higher chance to
1619                  * complete its operation, we give up our time slice now.
1620                  * If we have to retry again, we do sleep a bit.
1621                  */
1622                 Sleep(delay[tries]);
1623                 tries++;
1624                 goto repeat;
1625         }
1626         if (gle == ERROR_ACCESS_DENIED &&
1627                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1628                        "Should I try again?", pold, pnew))
1629                 goto repeat;
1630
1631         errno = EACCES;
1632         return -1;
1633 }
1634
1635 /*
1636  * Note that this doesn't return the actual pagesize, but
1637  * the allocation granularity. If future Windows specific git code
1638  * needs the real getpagesize function, we need to find another solution.
1639  */
1640 int mingw_getpagesize(void)
1641 {
1642         SYSTEM_INFO si;
1643         GetSystemInfo(&si);
1644         return si.dwAllocationGranularity;
1645 }
1646
1647 struct passwd *getpwuid(int uid)
1648 {
1649         static char user_name[100];
1650         static struct passwd p;
1651
1652         DWORD len = sizeof(user_name);
1653         if (!GetUserName(user_name, &len))
1654                 return NULL;
1655         p.pw_name = user_name;
1656         p.pw_gecos = "unknown";
1657         p.pw_dir = NULL;
1658         return &p;
1659 }
1660
1661 static HANDLE timer_event;
1662 static HANDLE timer_thread;
1663 static int timer_interval;
1664 static int one_shot;
1665 static sig_handler_t timer_fn = SIG_DFL;
1666
1667 /* The timer works like this:
1668  * The thread, ticktack(), is a trivial routine that most of the time
1669  * only waits to receive the signal to terminate. The main thread tells
1670  * the thread to terminate by setting the timer_event to the signalled
1671  * state.
1672  * But ticktack() interrupts the wait state after the timer's interval
1673  * length to call the signal handler.
1674  */
1675
1676 static unsigned __stdcall ticktack(void *dummy)
1677 {
1678         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1679                 if (timer_fn == SIG_DFL)
1680                         die("Alarm");
1681                 if (timer_fn != SIG_IGN)
1682                         timer_fn(SIGALRM);
1683                 if (one_shot)
1684                         break;
1685         }
1686         return 0;
1687 }
1688
1689 static int start_timer_thread(void)
1690 {
1691         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1692         if (timer_event) {
1693                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1694                 if (!timer_thread )
1695                         return errno = ENOMEM,
1696                                 error("cannot start timer thread");
1697         } else
1698                 return errno = ENOMEM,
1699                         error("cannot allocate resources for timer");
1700         return 0;
1701 }
1702
1703 static void stop_timer_thread(void)
1704 {
1705         if (timer_event)
1706                 SetEvent(timer_event);  /* tell thread to terminate */
1707         if (timer_thread) {
1708                 int rc = WaitForSingleObject(timer_thread, 1000);
1709                 if (rc == WAIT_TIMEOUT)
1710                         error("timer thread did not terminate timely");
1711                 else if (rc != WAIT_OBJECT_0)
1712                         error("waiting for timer thread failed: %lu",
1713                               GetLastError());
1714                 CloseHandle(timer_thread);
1715         }
1716         if (timer_event)
1717                 CloseHandle(timer_event);
1718         timer_event = NULL;
1719         timer_thread = NULL;
1720 }
1721
1722 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1723 {
1724         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1725 }
1726
1727 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1728 {
1729         static const struct timeval zero;
1730         static int atexit_done;
1731
1732         if (out != NULL)
1733                 return errno = EINVAL,
1734                         error("setitimer param 3 != NULL not implemented");
1735         if (!is_timeval_eq(&in->it_interval, &zero) &&
1736             !is_timeval_eq(&in->it_interval, &in->it_value))
1737                 return errno = EINVAL,
1738                         error("setitimer: it_interval must be zero or eq it_value");
1739
1740         if (timer_thread)
1741                 stop_timer_thread();
1742
1743         if (is_timeval_eq(&in->it_value, &zero) &&
1744             is_timeval_eq(&in->it_interval, &zero))
1745                 return 0;
1746
1747         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1748         one_shot = is_timeval_eq(&in->it_interval, &zero);
1749         if (!atexit_done) {
1750                 atexit(stop_timer_thread);
1751                 atexit_done = 1;
1752         }
1753         return start_timer_thread();
1754 }
1755
1756 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1757 {
1758         if (sig != SIGALRM)
1759                 return errno = EINVAL,
1760                         error("sigaction only implemented for SIGALRM");
1761         if (out != NULL)
1762                 return errno = EINVAL,
1763                         error("sigaction: param 3 != NULL not implemented");
1764
1765         timer_fn = in->sa_handler;
1766         return 0;
1767 }
1768
1769 #undef signal
1770 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1771 {
1772         sig_handler_t old = timer_fn;
1773         if (sig != SIGALRM)
1774                 return signal(sig, handler);
1775         timer_fn = handler;
1776         return old;
1777 }
1778
1779 static const char *make_backslash_path(const char *path)
1780 {
1781         static char buf[PATH_MAX + 1];
1782         char *c;
1783
1784         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1785                 die("Too long path: %.*s", 60, path);
1786
1787         for (c = buf; *c; c++) {
1788                 if (*c == '/')
1789                         *c = '\\';
1790         }
1791         return buf;
1792 }
1793
1794 void mingw_open_html(const char *unixpath)
1795 {
1796         const char *htmlpath = make_backslash_path(unixpath);
1797         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1798                         const char *, const char *, const char *, INT);
1799         T ShellExecute;
1800         HMODULE shell32;
1801         int r;
1802
1803         shell32 = LoadLibrary("shell32.dll");
1804         if (!shell32)
1805                 die("cannot load shell32.dll");
1806         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1807         if (!ShellExecute)
1808                 die("cannot run browser");
1809
1810         printf("Launching default browser to display HTML ...\n");
1811         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1812         FreeLibrary(shell32);
1813         /* see the MSDN documentation referring to the result codes here */
1814         if (r <= 32) {
1815                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1816         }
1817 }
1818
1819 int link(const char *oldpath, const char *newpath)
1820 {
1821         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1822         static T create_hard_link = NULL;
1823         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1824         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1825                 xutftowcs_path(wnewpath, newpath) < 0)
1826                 return -1;
1827
1828         if (!create_hard_link) {
1829                 create_hard_link = (T) GetProcAddress(
1830                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1831                 if (!create_hard_link)
1832                         create_hard_link = (T)-1;
1833         }
1834         if (create_hard_link == (T)-1) {
1835                 errno = ENOSYS;
1836                 return -1;
1837         }
1838         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1839                 errno = err_win_to_posix(GetLastError());
1840                 return -1;
1841         }
1842         return 0;
1843 }
1844
1845 char *getpass(const char *prompt)
1846 {
1847         struct strbuf buf = STRBUF_INIT;
1848
1849         fputs(prompt, stderr);
1850         for (;;) {
1851                 char c = _getch();
1852                 if (c == '\r' || c == '\n')
1853                         break;
1854                 strbuf_addch(&buf, c);
1855         }
1856         fputs("\n", stderr);
1857         return strbuf_detach(&buf, NULL);
1858 }
1859
1860 pid_t waitpid(pid_t pid, int *status, int options)
1861 {
1862         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1863             FALSE, pid);
1864         if (!h) {
1865                 errno = ECHILD;
1866                 return -1;
1867         }
1868
1869         if (pid > 0 && options & WNOHANG) {
1870                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1871                         CloseHandle(h);
1872                         return 0;
1873                 }
1874                 options &= ~WNOHANG;
1875         }
1876
1877         if (options == 0) {
1878                 struct pinfo_t **ppinfo;
1879                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1880                         CloseHandle(h);
1881                         return 0;
1882                 }
1883
1884                 if (status)
1885                         GetExitCodeProcess(h, (LPDWORD)status);
1886
1887                 EnterCriticalSection(&pinfo_cs);
1888
1889                 ppinfo = &pinfo;
1890                 while (*ppinfo) {
1891                         struct pinfo_t *info = *ppinfo;
1892                         if (info->pid == pid) {
1893                                 CloseHandle(info->proc);
1894                                 *ppinfo = info->next;
1895                                 free(info);
1896                                 break;
1897                         }
1898                         ppinfo = &info->next;
1899                 }
1900
1901                 LeaveCriticalSection(&pinfo_cs);
1902
1903                 CloseHandle(h);
1904                 return pid;
1905         }
1906         CloseHandle(h);
1907
1908         errno = EINVAL;
1909         return -1;
1910 }
1911
1912 const char *get_windows_home_directory(void)
1913 {
1914         static const char *home_directory = NULL;
1915         struct strbuf buf = STRBUF_INIT;
1916
1917         if (home_directory)
1918                 return home_directory;
1919
1920         home_directory = getenv("HOME");
1921         if (home_directory && *home_directory)
1922                 return home_directory;
1923
1924         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1925         home_directory = strbuf_detach(&buf, NULL);
1926
1927         return home_directory;
1928 }
1929
1930 int mingw_offset_1st_component(const char *path)
1931 {
1932         int offset = 0;
1933         if (has_dos_drive_prefix(path))
1934                 offset = 2;
1935
1936         /* unc paths */
1937         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1938
1939                 /* skip server name */
1940                 char *pos = strpbrk(path + 2, "\\/");
1941                 if (!pos)
1942                         return 0; /* Error: malformed unc path */
1943
1944                 do {
1945                         pos++;
1946                 } while (*pos && !is_dir_sep(*pos));
1947
1948                 offset = pos - path;
1949         }
1950
1951         return offset + is_dir_sep(path[offset]);
1952 }
1953
1954 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1955 {
1956         int upos = 0, wpos = 0;
1957         const unsigned char *utf = (const unsigned char*) utfs;
1958         if (!utf || !wcs || wcslen < 1) {
1959                 errno = EINVAL;
1960                 return -1;
1961         }
1962         /* reserve space for \0 */
1963         wcslen--;
1964         if (utflen < 0)
1965                 utflen = INT_MAX;
1966
1967         while (upos < utflen) {
1968                 int c = utf[upos++] & 0xff;
1969                 if (utflen == INT_MAX && c == 0)
1970                         break;
1971
1972                 if (wpos >= wcslen) {
1973                         wcs[wpos] = 0;
1974                         errno = ERANGE;
1975                         return -1;
1976                 }
1977
1978                 if (c < 0x80) {
1979                         /* ASCII */
1980                         wcs[wpos++] = c;
1981                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1982                                 (utf[upos] & 0xc0) == 0x80) {
1983                         /* 2-byte utf-8 */
1984                         c = ((c & 0x1f) << 6);
1985                         c |= (utf[upos++] & 0x3f);
1986                         wcs[wpos++] = c;
1987                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1988                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1989                                 (utf[upos] & 0xc0) == 0x80 &&
1990                                 (utf[upos + 1] & 0xc0) == 0x80) {
1991                         /* 3-byte utf-8 */
1992                         c = ((c & 0x0f) << 12);
1993                         c |= ((utf[upos++] & 0x3f) << 6);
1994                         c |= (utf[upos++] & 0x3f);
1995                         wcs[wpos++] = c;
1996                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
1997                                 wpos + 1 < wcslen &&
1998                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
1999                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2000                                 (utf[upos] & 0xc0) == 0x80 &&
2001                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2002                                 (utf[upos + 2] & 0xc0) == 0x80) {
2003                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2004                         c = ((c & 0x07) << 18);
2005                         c |= ((utf[upos++] & 0x3f) << 12);
2006                         c |= ((utf[upos++] & 0x3f) << 6);
2007                         c |= (utf[upos++] & 0x3f);
2008                         c -= 0x10000;
2009                         wcs[wpos++] = 0xd800 | (c >> 10);
2010                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2011                 } else if (c >= 0xa0) {
2012                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2013                         wcs[wpos++] = c;
2014                 } else {
2015                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2016                         static const char *hex = "0123456789abcdef";
2017                         wcs[wpos++] = hex[c >> 4];
2018                         if (wpos < wcslen)
2019                                 wcs[wpos++] = hex[c & 0x0f];
2020                 }
2021         }
2022         wcs[wpos] = 0;
2023         return wpos;
2024 }
2025
2026 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2027 {
2028         if (!wcs || !utf || utflen < 1) {
2029                 errno = EINVAL;
2030                 return -1;
2031         }
2032         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2033         if (utflen)
2034                 return utflen - 1;
2035         errno = ERANGE;
2036         return -1;
2037 }
2038
2039 /*
2040  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2041  * mingw startup code, see init.c in mingw runtime).
2042  */
2043 int _CRT_glob = 0;
2044
2045 typedef struct {
2046         int newmode;
2047 } _startupinfo;
2048
2049 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2050                 _startupinfo *si);
2051
2052 static NORETURN void die_startup()
2053 {
2054         fputs("fatal: not enough memory for initialization", stderr);
2055         exit(128);
2056 }
2057
2058 static void *malloc_startup(size_t size)
2059 {
2060         void *result = malloc(size);
2061         if (!result)
2062                 die_startup();
2063         return result;
2064 }
2065
2066 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2067 {
2068         len = xwcstoutf(buffer, wcs, len) + 1;
2069         return memcpy(malloc_startup(len), buffer, len);
2070 }
2071
2072 void mingw_startup()
2073 {
2074         int i, maxlen, argc;
2075         char *buffer;
2076         wchar_t **wenv, **wargv;
2077         _startupinfo si;
2078
2079         /* get wide char arguments and environment */
2080         si.newmode = 0;
2081         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2082                 die_startup();
2083
2084         /* determine size of argv and environ conversion buffer */
2085         maxlen = wcslen(_wpgmptr);
2086         for (i = 1; i < argc; i++)
2087                 maxlen = max(maxlen, wcslen(wargv[i]));
2088         for (i = 0; wenv[i]; i++)
2089                 maxlen = max(maxlen, wcslen(wenv[i]));
2090
2091         /*
2092          * nedmalloc can't free CRT memory, allocate resizable environment
2093          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2094          * use it while initializing the environment itself.
2095          */
2096         environ_size = i + 1;
2097         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2098         environ = malloc_startup(environ_alloc);
2099
2100         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2101         maxlen = 3 * maxlen + 1;
2102         buffer = malloc_startup(maxlen);
2103
2104         /* convert command line arguments and environment to UTF-8 */
2105         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2106         for (i = 1; i < argc; i++)
2107                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2108         for (i = 0; wenv[i]; i++)
2109                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2110         environ[i] = NULL;
2111         free(buffer);
2112
2113         /* sort environment for O(log n) getenv / putenv */
2114         qsort(environ, i, sizeof(char*), compareenv);
2115
2116         /* fix Windows specific environment settings */
2117
2118         /* on Windows it is TMP and TEMP */
2119         if (!getenv("TMPDIR")) {
2120                 const char *tmp = getenv("TMP");
2121                 if (!tmp)
2122                         tmp = getenv("TEMP");
2123                 if (tmp)
2124                         setenv("TMPDIR", tmp, 1);
2125         }
2126
2127         /* simulate TERM to enable auto-color (see color.c) */
2128         if (!getenv("TERM"))
2129                 setenv("TERM", "winansi", 1);
2130
2131         /* initialize critical section for waitpid pinfo_t list */
2132         InitializeCriticalSection(&pinfo_cs);
2133
2134         /* set up default file mode and file modes for stdin/out/err */
2135         _fmode = _O_BINARY;
2136         _setmode(_fileno(stdin), _O_BINARY);
2137         _setmode(_fileno(stdout), _O_BINARY);
2138         _setmode(_fileno(stderr), _O_BINARY);
2139
2140         /* initialize Unicode console */
2141         winansi_init();
2142 }