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