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 #define HCAST(type, handle) ((type)(intptr_t)handle)
  10
  11 static const int delay[] = { 0, 1, 10, 20, 40 };
  12
  13 int err_win_to_posix(DWORD winerr)
  14 {
  15         int error = ENOSYS;
  16         switch(winerr) {
  17         case ERROR_ACCESS_DENIED: error = EACCES; break;
  18         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  19         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  20         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  21         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  22         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  23         case ERROR_BAD_COMMAND: error = EIO; break;
  24         case ERROR_BAD_DEVICE: error = ENODEV; break;
  25         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  26         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  27         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  28         case ERROR_BAD_LENGTH: error = EINVAL; break;
  29         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  30         case ERROR_BAD_PIPE: error = EPIPE; break;
  31         case ERROR_BAD_UNIT: error = ENODEV; break;
  32         case ERROR_BAD_USERNAME: error = EINVAL; break;
  33         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  34         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  35         case ERROR_BUSY: error = EBUSY; break;
  36         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  37         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  38         case ERROR_CANNOT_MAKE: error = EACCES; break;
  39         case ERROR_CANTOPEN: error = EIO; break;
  40         case ERROR_CANTREAD: error = EIO; break;
  41         case ERROR_CANTWRITE: error = EIO; break;
  42         case ERROR_CRC: error = EIO; break;
  43         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  44         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  45         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  46         case ERROR_DIRECTORY: error = EINVAL; break;
  47         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  48         case ERROR_DISK_CHANGE: error = EIO; break;
  49         case ERROR_DISK_FULL: error = ENOSPC; break;
  50         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  51         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  52         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  53         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  54         case ERROR_FILE_EXISTS: error = EEXIST; break;
  55         case ERROR_FILE_INVALID: error = ENODEV; break;
  56         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  57         case ERROR_GEN_FAILURE: error = EIO; break;
  58         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  59         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  60         case ERROR_INVALID_ACCESS: error = EACCES; break;
  61         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  62         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  63         case ERROR_INVALID_DATA: error = EINVAL; break;
  64         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  65         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  66         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  67         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  68         case ERROR_INVALID_HANDLE: error = EBADF; break;
  69         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  70         case ERROR_INVALID_NAME: error = EINVAL; break;
  71         case ERROR_INVALID_OWNER: error = EINVAL; break;
  72         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  73         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  74         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  75         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  76         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  77         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  78         case ERROR_IO_DEVICE: error = EIO; break;
  79         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  80         case ERROR_LOCKED: error = EBUSY; break;
  81         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  82         case ERROR_LOGON_FAILURE: error = EACCES; break;
  83         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  84         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  85         case ERROR_MORE_DATA: error = EPIPE; break;
  86         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  87         case ERROR_NOACCESS: error = EFAULT; break;
  88         case ERROR_NONE_MAPPED: error = EINVAL; break;
  89         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  90         case ERROR_NOT_READY: error = EAGAIN; break;
  91         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  92         case ERROR_NO_DATA: error = EPIPE; break;
  93         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  94         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  95         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  96         case ERROR_OPEN_FAILED: error = EIO; break;
  97         case ERROR_OPEN_FILES: error = EBUSY; break;
  98         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  99         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
 100         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 101         case ERROR_PATH_BUSY: error = EBUSY; break;
 102         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 103         case ERROR_PIPE_BUSY: error = EBUSY; break;
 104         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 105         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 106         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 107         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 108         case ERROR_READ_FAULT: error = EIO; break;
 109         case ERROR_SEEK: error = EIO; break;
 110         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 111         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 112         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 113         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 114         case ERROR_SWAPERROR: error = ENOENT; break;
 115         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 116         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 117         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 118         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 119         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 120         case ERROR_WRITE_FAULT: error = EIO; break;
 121         case ERROR_WRITE_PROTECT: error = EROFS; break;
 122         }
 123         return error;
 124 }
 125
 126 static inline int is_file_in_use_error(DWORD errcode)
 127 {
 128         switch (errcode) {
 129         case ERROR_SHARING_VIOLATION:
 130         case ERROR_ACCESS_DENIED:
 131                 return 1;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int read_yes_no_answer(void)
 138 {
 139         char answer[1024];
 140
 141         if (fgets(answer, sizeof(answer), stdin)) {
 142                 size_t answer_len = strlen(answer);
 143                 int got_full_line = 0, c;
 144
 145                 /* remove the newline */
 146                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 147                         answer[answer_len-2] = '\0';
 148                         got_full_line = 1;
 149                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 150                         answer[answer_len-1] = '\0';
 151                         got_full_line = 1;
 152                 }
 153                 /* flush the buffer in case we did not get the full line */
 154                 if (!got_full_line)
 155                         while ((c = getchar()) != EOF && c != '\n')
 156                                 ;
 157         } else
 158                 /* we could not read, return the
 159                  * default answer which is no */
 160                 return 0;
 161
 162         if (tolower(answer[0]) == 'y' && !answer[1])
 163                 return 1;
 164         if (!strncasecmp(answer, "yes", sizeof(answer)))
 165                 return 1;
 166         if (tolower(answer[0]) == 'n' && !answer[1])
 167                 return 0;
 168         if (!strncasecmp(answer, "no", sizeof(answer)))
 169                 return 0;
 170
 171         /* did not find an answer we understand */
 172         return -1;
 173 }
 174
 175 static int ask_yes_no_if_possible(const char *format, ...)
 176 {
 177         char question[4096];
 178         const char *retry_hook[] = { NULL, NULL, NULL };
 179         va_list args;
 180
 181         va_start(args, format);
 182         vsnprintf(question, sizeof(question), format, args);
 183         va_end(args);
 184
 185         if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 186                 retry_hook[1] = question;
 187                 return !run_command_v_opt(retry_hook, 0);
 188         }
 189
 190         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 191                 return 0;
 192
 193         while (1) {
 194                 int answer;
 195                 fprintf(stderr, "%s (y/n) ", question);
 196
 197                 if ((answer = read_yes_no_answer()) >= 0)
 198                         return answer;
 199
 200                 fprintf(stderr, "Sorry, I did not understand your answer. "
 201                                 "Please type 'y' or 'n'\n");
 202         }
 203 }
 204
 205 int mingw_unlink(const char *pathname)
 206 {
 207         int ret, tries = 0;
 208         wchar_t wpathname[MAX_PATH];
 209         if (xutftowcs_path(wpathname, pathname) < 0)
 210                 return -1;
 211
 212         /* read-only files cannot be removed */
 213         _wchmod(wpathname, 0666);
 214         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 215                 if (!is_file_in_use_error(GetLastError()))
 216                         break;
 217                 /*
 218                  * We assume that some other process had the source or
 219                  * destination file open at the wrong moment and retry.
 220                  * In order to give the other process a higher chance to
 221                  * complete its operation, we give up our time slice now.
 222                  * If we have to retry again, we do sleep a bit.
 223                  */
 224                 Sleep(delay[tries]);
 225                 tries++;
 226         }
 227         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 228                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 229                         "Should I try again?", pathname))
 230                ret = _wunlink(wpathname);
 231         return ret;
 232 }
 233
 234 static int is_dir_empty(const wchar_t *wpath)
 235 {
 236         WIN32_FIND_DATAW findbuf;
 237         HANDLE handle;
 238         wchar_t wbuf[MAX_PATH + 2];
 239         wcscpy(wbuf, wpath);
 240         wcscat(wbuf, L"\\*");
 241         handle = FindFirstFileW(wbuf, &findbuf);
 242         if (handle == INVALID_HANDLE_VALUE)
 243                 return GetLastError() == ERROR_NO_MORE_FILES;
 244
 245         while (!wcscmp(findbuf.cFileName, L".") ||
 246                         !wcscmp(findbuf.cFileName, L".."))
 247                 if (!FindNextFileW(handle, &findbuf)) {
 248                         DWORD err = GetLastError();
 249                         FindClose(handle);
 250                         return err == ERROR_NO_MORE_FILES;
 251                 }
 252         FindClose(handle);
 253         return 0;
 254 }
 255
 256 int mingw_rmdir(const char *pathname)
 257 {
 258         int ret, tries = 0;
 259         wchar_t wpathname[MAX_PATH];
 260         if (xutftowcs_path(wpathname, pathname) < 0)
 261                 return -1;
 262
 263         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 264                 if (!is_file_in_use_error(GetLastError()))
 265                         errno = err_win_to_posix(GetLastError());
 266                 if (errno != EACCES)
 267                         break;
 268                 if (!is_dir_empty(wpathname)) {
 269                         errno = ENOTEMPTY;
 270                         break;
 271                 }
 272                 /*
 273                  * We assume that some other process had the source or
 274                  * destination file open at the wrong moment and retry.
 275                  * In order to give the other process a higher chance to
 276                  * complete its operation, we give up our time slice now.
 277                  * If we have to retry again, we do sleep a bit.
 278                  */
 279                 Sleep(delay[tries]);
 280                 tries++;
 281         }
 282         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 283                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 284                         "Should I try again?", pathname))
 285                ret = _wrmdir(wpathname);
 286         return ret;
 287 }
 288
 289 static inline int needs_hiding(const char *path)
 290 {
 291         const char *basename;
 292
 293         if (hide_dotfiles == HIDE_DOTFILES_FALSE)
 294                 return 0;
 295
 296         /* We cannot use basename(), as it would remove trailing slashes */
 297         mingw_skip_dos_drive_prefix((char **)&path);
 298         if (!*path)
 299                 return 0;
 300
 301         for (basename = path; *path; path++)
 302                 if (is_dir_sep(*path)) {
 303                         do {
 304                                 path++;
 305                         } while (is_dir_sep(*path));
 306                         /* ignore trailing slashes */
 307                         if (*path)
 308                                 basename = path;
 309                 }
 310
 311         if (hide_dotfiles == HIDE_DOTFILES_TRUE)
 312                 return *basename == '.';
 313
 314         assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
 315         return !strncasecmp(".git", basename, 4) &&
 316                 (!basename[4] || is_dir_sep(basename[4]));
 317 }
 318
 319 static int set_hidden_flag(const wchar_t *path, int set)
 320 {
 321         DWORD original = GetFileAttributesW(path), modified;
 322         if (set)
 323                 modified = original | FILE_ATTRIBUTE_HIDDEN;
 324         else
 325                 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
 326         if (original == modified || SetFileAttributesW(path, modified))
 327                 return 0;
 328         errno = err_win_to_posix(GetLastError());
 329         return -1;
 330 }
 331
 332 int mingw_mkdir(const char *path, int mode)
 333 {
 334         int ret;
 335         wchar_t wpath[MAX_PATH];
 336         if (xutftowcs_path(wpath, path) < 0)
 337                 return -1;
 338         ret = _wmkdir(wpath);
 339         if (!ret && needs_hiding(path))
 340                 return set_hidden_flag(wpath, 1);
 341         return ret;
 342 }
 343
 344 int mingw_open (const char *filename, int oflags, ...)
 345 {
 346         va_list args;
 347         unsigned mode;
 348         int fd;
 349         wchar_t wfilename[MAX_PATH];
 350
 351         va_start(args, oflags);
 352         mode = va_arg(args, int);
 353         va_end(args);
 354
 355         if (filename && !strcmp(filename, "/dev/null"))
 356                 filename = "nul";
 357
 358         if (xutftowcs_path(wfilename, filename) < 0)
 359                 return -1;
 360         fd = _wopen(wfilename, oflags, mode);
 361
 362         if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 363                 DWORD attrs = GetFileAttributesW(wfilename);
 364                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 365                         errno = EISDIR;
 366         }
 367         if ((oflags & O_CREAT) && needs_hiding(filename)) {
 368                 /*
 369                  * Internally, _wopen() uses the CreateFile() API which errors
 370                  * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
 371                  * specified and an already existing file's attributes do not
 372                  * match *exactly*. As there is no mode or flag we can set that
 373                  * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
 374                  * again *without* the O_CREAT flag (that corresponds to the
 375                  * CREATE_ALWAYS flag of CreateFile()).
 376                  */
 377                 if (fd < 0 && errno == EACCES)
 378                         fd = _wopen(wfilename, oflags & ~O_CREAT, mode);
 379                 if (fd >= 0 && set_hidden_flag(wfilename, 1))
 380                         warning("could not mark '%s' as hidden.", filename);
 381         }
 382         return fd;
 383 }
 384
 385 static BOOL WINAPI ctrl_ignore(DWORD type)
 386 {
 387         return TRUE;
 388 }
 389
 390 #undef fgetc
 391 int mingw_fgetc(FILE *stream)
 392 {
 393         int ch;
 394         if (!isatty(_fileno(stream)))
 395                 return fgetc(stream);
 396
 397         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 398         while (1) {
 399                 ch = fgetc(stream);
 400                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 401                         break;
 402
 403                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 404                 mingw_raise(SIGINT);
 405         }
 406         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 407         return ch;
 408 }
 409
 410 #undef fopen
 411 FILE *mingw_fopen (const char *filename, const char *otype)
 412 {
 413         int hide = needs_hiding(filename);
 414         FILE *file;
 415         wchar_t wfilename[MAX_PATH], wotype[4];
 416         if (filename && !strcmp(filename, "/dev/null"))
 417                 filename = "nul";
 418         if (xutftowcs_path(wfilename, filename) < 0 ||
 419                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 420                 return NULL;
 421         if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 422                 error("could not unhide %s", filename);
 423                 return NULL;
 424         }
 425         file = _wfopen(wfilename, wotype);
 426         if (!file && GetLastError() == ERROR_INVALID_NAME)
 427                 errno = ENOENT;
 428         if (file && hide && set_hidden_flag(wfilename, 1))
 429                 warning("could not mark '%s' as hidden.", filename);
 430         return file;
 431 }
 432
 433 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 434 {
 435         int hide = needs_hiding(filename);
 436         FILE *file;
 437         wchar_t wfilename[MAX_PATH], wotype[4];
 438         if (filename && !strcmp(filename, "/dev/null"))
 439                 filename = "nul";
 440         if (xutftowcs_path(wfilename, filename) < 0 ||
 441                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 442                 return NULL;
 443         if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 444                 error("could not unhide %s", filename);
 445                 return NULL;
 446         }
 447         file = _wfreopen(wfilename, wotype, stream);
 448         if (file && hide && set_hidden_flag(wfilename, 1))
 449                 warning("could not mark '%s' as hidden.", filename);
 450         return file;
 451 }
 452
 453 #undef fflush
 454 int mingw_fflush(FILE *stream)
 455 {
 456         int ret = fflush(stream);
 457
 458         /*
 459          * write() is used behind the scenes of stdio output functions.
 460          * Since git code does not check for errors after each stdio write
 461          * operation, it can happen that write() is called by a later
 462          * stdio function even if an earlier write() call failed. In the
 463          * case of a pipe whose readable end was closed, only the first
 464          * call to write() reports EPIPE on Windows. Subsequent write()
 465          * calls report EINVAL. It is impossible to notice whether this
 466          * fflush invocation triggered such a case, therefore, we have to
 467          * catch all EINVAL errors whole-sale.
 468          */
 469         if (ret && errno == EINVAL)
 470                 errno = EPIPE;
 471
 472         return ret;
 473 }
 474
 475 #undef write
 476 ssize_t mingw_write(int fd, const void *buf, size_t len)
 477 {
 478         ssize_t result = write(fd, buf, len);
 479
 480         if (result < 0 && errno == EINVAL && buf) {
 481                 /* check if fd is a pipe */
 482                 HANDLE h = (HANDLE) _get_osfhandle(fd);
 483                 if (GetFileType(h) == FILE_TYPE_PIPE)
 484                         errno = EPIPE;
 485                 else
 486                         errno = EINVAL;
 487         }
 488
 489         return result;
 490 }
 491
 492 int mingw_access(const char *filename, int mode)
 493 {
 494         wchar_t wfilename[MAX_PATH];
 495         if (xutftowcs_path(wfilename, filename) < 0)
 496                 return -1;
 497         /* X_OK is not supported by the MSVCRT version */
 498         return _waccess(wfilename, mode & ~X_OK);
 499 }
 500
 501 int mingw_chdir(const char *dirname)
 502 {
 503         wchar_t wdirname[MAX_PATH];
 504         if (xutftowcs_path(wdirname, dirname) < 0)
 505                 return -1;
 506         return _wchdir(wdirname);
 507 }
 508
 509 int mingw_chmod(const char *filename, int mode)
 510 {
 511         wchar_t wfilename[MAX_PATH];
 512         if (xutftowcs_path(wfilename, filename) < 0)
 513                 return -1;
 514         return _wchmod(wfilename, mode);
 515 }
 516
 517 /*
 518  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 519  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 520  */
 521 static inline long long filetime_to_hnsec(const FILETIME *ft)
 522 {
 523         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 524         /* Windows to Unix Epoch conversion */
 525         return winTime - 116444736000000000LL;
 526 }
 527
 528 static inline time_t filetime_to_time_t(const FILETIME *ft)
 529 {
 530         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 531 }
 532
 533 /**
 534  * Verifies that safe_create_leading_directories() would succeed.
 535  */
 536 static int has_valid_directory_prefix(wchar_t *wfilename)
 537 {
 538         int n = wcslen(wfilename);
 539
 540         while (n > 0) {
 541                 wchar_t c = wfilename[--n];
 542                 DWORD attributes;
 543
 544                 if (!is_dir_sep(c))
 545                         continue;
 546
 547                 wfilename[n] = L'\0';
 548                 attributes = GetFileAttributesW(wfilename);
 549                 wfilename[n] = c;
 550                 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
 551                                 attributes == FILE_ATTRIBUTE_DEVICE)
 552                         return 1;
 553                 if (attributes == INVALID_FILE_ATTRIBUTES)
 554                         switch (GetLastError()) {
 555                         case ERROR_PATH_NOT_FOUND:
 556                                 continue;
 557                         case ERROR_FILE_NOT_FOUND:
 558                                 /* This implies parent directory exists. */
 559                                 return 1;
 560                         }
 561                 return 0;
 562         }
 563         return 1;
 564 }
 565
 566 /* We keep the do_lstat code in a separate function to avoid recursion.
 567  * When a path ends with a slash, the stat will fail with ENOENT. In
 568  * this case, we strip the trailing slashes and stat again.
 569  *
 570  * If follow is true then act like stat() and report on the link
 571  * target. Otherwise report on the link itself.
 572  */
 573 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 574 {
 575         WIN32_FILE_ATTRIBUTE_DATA fdata;
 576         wchar_t wfilename[MAX_PATH];
 577         if (xutftowcs_path(wfilename, file_name) < 0)
 578                 return -1;
 579
 580         if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 581                 buf->st_ino = 0;
 582                 buf->st_gid = 0;
 583                 buf->st_uid = 0;
 584                 buf->st_nlink = 1;
 585                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 586                 buf->st_size = fdata.nFileSizeLow |
 587                         (((off_t)fdata.nFileSizeHigh)<<32);
 588                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 589                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 590                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 591                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 592                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 593                         WIN32_FIND_DATAW findbuf;
 594                         HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 595                         if (handle != INVALID_HANDLE_VALUE) {
 596                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 597                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 598                                         if (follow) {
 599                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 600                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 601                                         } else {
 602                                                 buf->st_mode = S_IFLNK;
 603                                         }
 604                                         buf->st_mode |= S_IREAD;
 605                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 606                                                 buf->st_mode |= S_IWRITE;
 607                                 }
 608                                 FindClose(handle);
 609                         }
 610                 }
 611                 return 0;
 612         }
 613         switch (GetLastError()) {
 614         case ERROR_ACCESS_DENIED:
 615         case ERROR_SHARING_VIOLATION:
 616         case ERROR_LOCK_VIOLATION:
 617         case ERROR_SHARING_BUFFER_EXCEEDED:
 618                 errno = EACCES;
 619                 break;
 620         case ERROR_BUFFER_OVERFLOW:
 621                 errno = ENAMETOOLONG;
 622                 break;
 623         case ERROR_NOT_ENOUGH_MEMORY:
 624                 errno = ENOMEM;
 625                 break;
 626         case ERROR_PATH_NOT_FOUND:
 627                 if (!has_valid_directory_prefix(wfilename)) {
 628                         errno = ENOTDIR;
 629                         break;
 630                 }
 631                 /* fallthru */
 632         default:
 633                 errno = ENOENT;
 634                 break;
 635         }
 636         return -1;
 637 }
 638
 639 /* We provide our own lstat/fstat functions, since the provided
 640  * lstat/fstat functions are so slow. These stat functions are
 641  * tailored for Git's usage (read: fast), and are not meant to be
 642  * complete. Note that Git stat()s are redirected to mingw_lstat()
 643  * too, since Windows doesn't really handle symlinks that well.
 644  */
 645 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 646 {
 647         int namelen;
 648         char alt_name[PATH_MAX];
 649
 650         if (!do_lstat(follow, file_name, buf))
 651                 return 0;
 652
 653         /* if file_name ended in a '/', Windows returned ENOENT;
 654          * try again without trailing slashes
 655          */
 656         if (errno != ENOENT)
 657                 return -1;
 658
 659         namelen = strlen(file_name);
 660         if (namelen && file_name[namelen-1] != '/')
 661                 return -1;
 662         while (namelen && file_name[namelen-1] == '/')
 663                 --namelen;
 664         if (!namelen || namelen >= PATH_MAX)
 665                 return -1;
 666
 667         memcpy(alt_name, file_name, namelen);
 668         alt_name[namelen] = 0;
 669         return do_lstat(follow, alt_name, buf);
 670 }
 671
 672 int mingw_lstat(const char *file_name, struct stat *buf)
 673 {
 674         return do_stat_internal(0, file_name, buf);
 675 }
 676 int mingw_stat(const char *file_name, struct stat *buf)
 677 {
 678         return do_stat_internal(1, file_name, buf);
 679 }
 680
 681 int mingw_fstat(int fd, struct stat *buf)
 682 {
 683         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 684         BY_HANDLE_FILE_INFORMATION fdata;
 685
 686         if (fh == INVALID_HANDLE_VALUE) {
 687                 errno = EBADF;
 688                 return -1;
 689         }
 690         /* direct non-file handles to MS's fstat() */
 691         if (GetFileType(fh) != FILE_TYPE_DISK)
 692                 return _fstati64(fd, buf);
 693
 694         if (GetFileInformationByHandle(fh, &fdata)) {
 695                 buf->st_ino = 0;
 696                 buf->st_gid = 0;
 697                 buf->st_uid = 0;
 698                 buf->st_nlink = 1;
 699                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 700                 buf->st_size = fdata.nFileSizeLow |
 701                         (((off_t)fdata.nFileSizeHigh)<<32);
 702                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 703                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 704                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 705                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 706                 return 0;
 707         }
 708         errno = EBADF;
 709         return -1;
 710 }
 711
 712 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 713 {
 714         long long winTime = t * 10000000LL + 116444736000000000LL;
 715         ft->dwLowDateTime = winTime;
 716         ft->dwHighDateTime = winTime >> 32;
 717 }
 718
 719 int mingw_utime (const char *file_name, const struct utimbuf *times)
 720 {
 721         FILETIME mft, aft;
 722         int fh, rc;
 723         DWORD attrs;
 724         wchar_t wfilename[MAX_PATH];
 725         if (xutftowcs_path(wfilename, file_name) < 0)
 726                 return -1;
 727
 728         /* must have write permission */
 729         attrs = GetFileAttributesW(wfilename);
 730         if (attrs != INVALID_FILE_ATTRIBUTES &&
 731             (attrs & FILE_ATTRIBUTE_READONLY)) {
 732                 /* ignore errors here; open() will report them */
 733                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 734         }
 735
 736         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 737                 rc = -1;
 738                 goto revert_attrs;
 739         }
 740
 741         if (times) {
 742                 time_t_to_filetime(times->modtime, &mft);
 743                 time_t_to_filetime(times->actime, &aft);
 744         } else {
 745                 GetSystemTimeAsFileTime(&mft);
 746                 aft = mft;
 747         }
 748         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 749                 errno = EINVAL;
 750                 rc = -1;
 751         } else
 752                 rc = 0;
 753         close(fh);
 754
 755 revert_attrs:
 756         if (attrs != INVALID_FILE_ATTRIBUTES &&
 757             (attrs & FILE_ATTRIBUTE_READONLY)) {
 758                 /* ignore errors again */
 759                 SetFileAttributesW(wfilename, attrs);
 760         }
 761         return rc;
 762 }
 763
 764 unsigned int sleep (unsigned int seconds)
 765 {
 766         Sleep(seconds*1000);
 767         return 0;
 768 }
 769
 770 char *mingw_mktemp(char *template)
 771 {
 772         wchar_t wtemplate[MAX_PATH];
 773         if (xutftowcs_path(wtemplate, template) < 0)
 774                 return NULL;
 775         if (!_wmktemp(wtemplate))
 776                 return NULL;
 777         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 778                 return NULL;
 779         return template;
 780 }
 781
 782 int mkstemp(char *template)
 783 {
 784         char *filename = mktemp(template);
 785         if (filename == NULL)
 786                 return -1;
 787         return open(filename, O_RDWR | O_CREAT, 0600);
 788 }
 789
 790 int gettimeofday(struct timeval *tv, void *tz)
 791 {
 792         FILETIME ft;
 793         long long hnsec;
 794
 795         GetSystemTimeAsFileTime(&ft);
 796         hnsec = filetime_to_hnsec(&ft);
 797         tv->tv_sec = hnsec / 10000000;
 798         tv->tv_usec = (hnsec % 10000000) / 10;
 799         return 0;
 800 }
 801
 802 int pipe(int filedes[2])
 803 {
 804         HANDLE h[2];
 805
 806         /* this creates non-inheritable handles */
 807         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 808                 errno = err_win_to_posix(GetLastError());
 809                 return -1;
 810         }
 811         filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
 812         if (filedes[0] < 0) {
 813                 CloseHandle(h[0]);
 814                 CloseHandle(h[1]);
 815                 return -1;
 816         }
 817         filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
 818         if (filedes[1] < 0) {
 819                 close(filedes[0]);
 820                 CloseHandle(h[1]);
 821                 return -1;
 822         }
 823         return 0;
 824 }
 825
 826 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 827 {
 828         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 829         memcpy(result, gmtime(timep), sizeof(struct tm));
 830         return result;
 831 }
 832
 833 struct tm *localtime_r(const time_t *timep, struct tm *result)
 834 {
 835         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 836         memcpy(result, localtime(timep), sizeof(struct tm));
 837         return result;
 838 }
 839
 840 char *mingw_getcwd(char *pointer, int len)
 841 {
 842         wchar_t wpointer[MAX_PATH];
 843         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 844                 return NULL;
 845         if (xwcstoutf(pointer, wpointer, len) < 0)
 846                 return NULL;
 847         convert_slashes(pointer);
 848         return pointer;
 849 }
 850
 851 /*
 852  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 853  * (Parsing C++ Command-Line Arguments)
 854  */
 855 static const char *quote_arg(const char *arg)
 856 {
 857         /* count chars to quote */
 858         int len = 0, n = 0;
 859         int force_quotes = 0;
 860         char *q, *d;
 861         const char *p = arg;
 862         if (!*p) force_quotes = 1;
 863         while (*p) {
 864                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 865                         force_quotes = 1;
 866                 else if (*p == '"')
 867                         n++;
 868                 else if (*p == '\\') {
 869                         int count = 0;
 870                         while (*p == '\\') {
 871                                 count++;
 872                                 p++;
 873                                 len++;
 874                         }
 875                         if (*p == '"')
 876                                 n += count*2 + 1;
 877                         continue;
 878                 }
 879                 len++;
 880                 p++;
 881         }
 882         if (!force_quotes && n == 0)
 883                 return arg;
 884
 885         /* insert \ where necessary */
 886         d = q = xmalloc(st_add3(len, n, 3));
 887         *d++ = '"';
 888         while (*arg) {
 889                 if (*arg == '"')
 890                         *d++ = '\\';
 891                 else if (*arg == '\\') {
 892                         int count = 0;
 893                         while (*arg == '\\') {
 894                                 count++;
 895                                 *d++ = *arg++;
 896                         }
 897                         if (*arg == '"') {
 898                                 while (count-- > 0)
 899                                         *d++ = '\\';
 900                                 *d++ = '\\';
 901                         }
 902                 }
 903                 *d++ = *arg++;
 904         }
 905         *d++ = '"';
 906         *d++ = 0;
 907         return q;
 908 }
 909
 910 static const char *parse_interpreter(const char *cmd)
 911 {
 912         static char buf[100];
 913         char *p, *opt;
 914         int n, fd;
 915
 916         /* don't even try a .exe */
 917         n = strlen(cmd);
 918         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 919                 return NULL;
 920
 921         fd = open(cmd, O_RDONLY);
 922         if (fd < 0)
 923                 return NULL;
 924         n = read(fd, buf, sizeof(buf)-1);
 925         close(fd);
 926         if (n < 4)      /* at least '#!/x' and not error */
 927                 return NULL;
 928
 929         if (buf[0] != '#' || buf[1] != '!')
 930                 return NULL;
 931         buf[n] = '\0';
 932         p = buf + strcspn(buf, "\r\n");
 933         if (!*p)
 934                 return NULL;
 935
 936         *p = '\0';
 937         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 938                 return NULL;
 939         /* strip options */
 940         if ((opt = strchr(p+1, ' ')))
 941                 *opt = '\0';
 942         return p+1;
 943 }
 944
 945 /*
 946  * exe_only means that we only want to detect .exe files, but not scripts
 947  * (which do not have an extension)
 948  */
 949 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
 950                          int isexe, int exe_only)
 951 {
 952         char path[MAX_PATH];
 953         snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
 954
 955         if (!isexe && access(path, F_OK) == 0)
 956                 return xstrdup(path);
 957         path[strlen(path)-4] = '\0';
 958         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 959                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 960                         return xstrdup(path);
 961         return NULL;
 962 }
 963
 964 /*
 965  * Determines the absolute path of cmd using the split path in path.
 966  * If cmd contains a slash or backslash, no lookup is performed.
 967  */
 968 static char *path_lookup(const char *cmd, int exe_only)
 969 {
 970         const char *path;
 971         char *prog = NULL;
 972         int len = strlen(cmd);
 973         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 974
 975         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 976                 return xstrdup(cmd);
 977
 978         path = mingw_getenv("PATH");
 979         if (!path)
 980                 return NULL;
 981
 982         while (!prog) {
 983                 const char *sep = strchrnul(path, ';');
 984                 int dirlen = sep - path;
 985                 if (dirlen)
 986                         prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
 987                 if (!*sep)
 988                         break;
 989                 path = sep + 1;
 990         }
 991
 992         return prog;
 993 }
 994
 995 static int do_putenv(char **env, const char *name, int size, int free_old);
 996
 997 /* used number of elements of environ array, including terminating NULL */
 998 static int environ_size = 0;
 999 /* allocated size of environ array, in bytes */
1000 static int environ_alloc = 0;
1001
1002 /*
1003  * Create environment block suitable for CreateProcess. Merges current
1004  * process environment and the supplied environment changes.
1005  */
1006 static wchar_t *make_environment_block(char **deltaenv)
1007 {
1008         wchar_t *wenvblk = NULL;
1009         char **tmpenv;
1010         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1011
1012         while (deltaenv && deltaenv[i])
1013                 i++;
1014
1015         /* copy the environment, leaving space for changes */
1016         ALLOC_ARRAY(tmpenv, size + i);
1017         memcpy(tmpenv, environ, size * sizeof(char*));
1018
1019         /* merge supplied environment changes into the temporary environment */
1020         for (i = 0; deltaenv && deltaenv[i]; i++)
1021                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1022
1023         /* create environment block from temporary environment */
1024         for (i = 0; tmpenv[i]; i++) {
1025                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1026                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1027                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1028         }
1029         /* add final \0 terminator */
1030         wenvblk[wenvpos] = 0;
1031         free(tmpenv);
1032         return wenvblk;
1033 }
1034
1035 struct pinfo_t {
1036         struct pinfo_t *next;
1037         pid_t pid;
1038         HANDLE proc;
1039 };
1040 static struct pinfo_t *pinfo = NULL;
1041 CRITICAL_SECTION pinfo_cs;
1042
1043 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1044                               const char *dir,
1045                               int prepend_cmd, int fhin, int fhout, int fherr)
1046 {
1047         STARTUPINFOW si;
1048         PROCESS_INFORMATION pi;
1049         struct strbuf args;
1050         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1051         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1052         BOOL ret;
1053
1054         /* Determine whether or not we are associated to a console */
1055         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1056                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1057                         FILE_ATTRIBUTE_NORMAL, NULL);
1058         if (cons == INVALID_HANDLE_VALUE) {
1059                 /* There is no console associated with this process.
1060                  * Since the child is a console process, Windows
1061                  * would normally create a console window. But
1062                  * since we'll be redirecting std streams, we do
1063                  * not need the console.
1064                  * It is necessary to use DETACHED_PROCESS
1065                  * instead of CREATE_NO_WINDOW to make ssh
1066                  * recognize that it has no console.
1067                  */
1068                 flags |= DETACHED_PROCESS;
1069         } else {
1070                 /* There is already a console. If we specified
1071                  * DETACHED_PROCESS here, too, Windows would
1072                  * disassociate the child from the console.
1073                  * The same is true for CREATE_NO_WINDOW.
1074                  * Go figure!
1075                  */
1076                 CloseHandle(cons);
1077         }
1078         memset(&si, 0, sizeof(si));
1079         si.cb = sizeof(si);
1080         si.dwFlags = STARTF_USESTDHANDLES;
1081         si.hStdInput = winansi_get_osfhandle(fhin);
1082         si.hStdOutput = winansi_get_osfhandle(fhout);
1083         si.hStdError = winansi_get_osfhandle(fherr);
1084
1085         if (xutftowcs_path(wcmd, cmd) < 0)
1086                 return -1;
1087         if (dir && xutftowcs_path(wdir, dir) < 0)
1088                 return -1;
1089
1090         /* concatenate argv, quoting args as we go */
1091         strbuf_init(&args, 0);
1092         if (prepend_cmd) {
1093                 char *quoted = (char *)quote_arg(cmd);
1094                 strbuf_addstr(&args, quoted);
1095                 if (quoted != cmd)
1096                         free(quoted);
1097         }
1098         for (; *argv; argv++) {
1099                 char *quoted = (char *)quote_arg(*argv);
1100                 if (*args.buf)
1101                         strbuf_addch(&args, ' ');
1102                 strbuf_addstr(&args, quoted);
1103                 if (quoted != *argv)
1104                         free(quoted);
1105         }
1106
1107         ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1108         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1109         strbuf_release(&args);
1110
1111         wenvblk = make_environment_block(deltaenv);
1112
1113         memset(&pi, 0, sizeof(pi));
1114         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1115                 wenvblk, dir ? wdir : NULL, &si, &pi);
1116
1117         free(wenvblk);
1118         free(wargs);
1119
1120         if (!ret) {
1121                 errno = ENOENT;
1122                 return -1;
1123         }
1124         CloseHandle(pi.hThread);
1125
1126         /*
1127          * The process ID is the human-readable identifier of the process
1128          * that we want to present in log and error messages. The handle
1129          * is not useful for this purpose. But we cannot close it, either,
1130          * because it is not possible to turn a process ID into a process
1131          * handle after the process terminated.
1132          * Keep the handle in a list for waitpid.
1133          */
1134         EnterCriticalSection(&pinfo_cs);
1135         {
1136                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1137                 info->pid = pi.dwProcessId;
1138                 info->proc = pi.hProcess;
1139                 info->next = pinfo;
1140                 pinfo = info;
1141         }
1142         LeaveCriticalSection(&pinfo_cs);
1143
1144         return (pid_t)pi.dwProcessId;
1145 }
1146
1147 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1148 {
1149         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1150 }
1151
1152 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1153                      const char *dir,
1154                      int fhin, int fhout, int fherr)
1155 {
1156         pid_t pid;
1157         char *prog = path_lookup(cmd, 0);
1158
1159         if (!prog) {
1160                 errno = ENOENT;
1161                 pid = -1;
1162         }
1163         else {
1164                 const char *interpr = parse_interpreter(prog);
1165
1166                 if (interpr) {
1167                         const char *argv0 = argv[0];
1168                         char *iprog = path_lookup(interpr, 1);
1169                         argv[0] = prog;
1170                         if (!iprog) {
1171                                 errno = ENOENT;
1172                                 pid = -1;
1173                         }
1174                         else {
1175                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1176                                                        fhin, fhout, fherr);
1177                                 free(iprog);
1178                         }
1179                         argv[0] = argv0;
1180                 }
1181                 else
1182                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1183                                                fhin, fhout, fherr);
1184                 free(prog);
1185         }
1186         return pid;
1187 }
1188
1189 static int try_shell_exec(const char *cmd, char *const *argv)
1190 {
1191         const char *interpr = parse_interpreter(cmd);
1192         char *prog;
1193         int pid = 0;
1194
1195         if (!interpr)
1196                 return 0;
1197         prog = path_lookup(interpr, 1);
1198         if (prog) {
1199                 int argc = 0;
1200                 const char **argv2;
1201                 while (argv[argc]) argc++;
1202                 ALLOC_ARRAY(argv2, argc + 1);
1203                 argv2[0] = (char *)cmd; /* full path to the script file */
1204                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1205                 pid = mingw_spawnv(prog, argv2, 1);
1206                 if (pid >= 0) {
1207                         int status;
1208                         if (waitpid(pid, &status, 0) < 0)
1209                                 status = 255;
1210                         exit(status);
1211                 }
1212                 pid = 1;        /* indicate that we tried but failed */
1213                 free(prog);
1214                 free(argv2);
1215         }
1216         return pid;
1217 }
1218
1219 int mingw_execv(const char *cmd, char *const *argv)
1220 {
1221         /* check if git_command is a shell script */
1222         if (!try_shell_exec(cmd, argv)) {
1223                 int pid, status;
1224
1225                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1226                 if (pid < 0)
1227                         return -1;
1228                 if (waitpid(pid, &status, 0) < 0)
1229                         status = 255;
1230                 exit(status);
1231         }
1232         return -1;
1233 }
1234
1235 int mingw_execvp(const char *cmd, char *const *argv)
1236 {
1237         char *prog = path_lookup(cmd, 0);
1238
1239         if (prog) {
1240                 mingw_execv(prog, argv);
1241                 free(prog);
1242         } else
1243                 errno = ENOENT;
1244
1245         return -1;
1246 }
1247
1248 int mingw_kill(pid_t pid, int sig)
1249 {
1250         if (pid > 0 && sig == SIGTERM) {
1251                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1252
1253                 if (TerminateProcess(h, -1)) {
1254                         CloseHandle(h);
1255                         return 0;
1256                 }
1257
1258                 errno = err_win_to_posix(GetLastError());
1259                 CloseHandle(h);
1260                 return -1;
1261         } else if (pid > 0 && sig == 0) {
1262                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1263                 if (h) {
1264                         CloseHandle(h);
1265                         return 0;
1266                 }
1267         }
1268
1269         errno = EINVAL;
1270         return -1;
1271 }
1272
1273 /*
1274  * Compare environment entries by key (i.e. stopping at '=' or '\0').
1275  */
1276 static int compareenv(const void *v1, const void *v2)
1277 {
1278         const char *e1 = *(const char**)v1;
1279         const char *e2 = *(const char**)v2;
1280
1281         for (;;) {
1282                 int c1 = *e1++;
1283                 int c2 = *e2++;
1284                 c1 = (c1 == '=') ? 0 : tolower(c1);
1285                 c2 = (c2 == '=') ? 0 : tolower(c2);
1286                 if (c1 > c2)
1287                         return 1;
1288                 if (c1 < c2)
1289                         return -1;
1290                 if (c1 == 0)
1291                         return 0;
1292         }
1293 }
1294
1295 static int bsearchenv(char **env, const char *name, size_t size)
1296 {
1297         unsigned low = 0, high = size;
1298         while (low < high) {
1299                 unsigned mid = low + ((high - low) >> 1);
1300                 int cmp = compareenv(&env[mid], &name);
1301                 if (cmp < 0)
1302                         low = mid + 1;
1303                 else if (cmp > 0)
1304                         high = mid;
1305                 else
1306                         return mid;
1307         }
1308         return ~low; /* not found, return 1's complement of insert position */
1309 }
1310
1311 /*
1312  * If name contains '=', then sets the variable, otherwise it unsets it
1313  * Size includes the terminating NULL. Env must have room for size + 1 entries
1314  * (in case of insert). Returns the new size. Optionally frees removed entries.
1315  */
1316 static int do_putenv(char **env, const char *name, int size, int free_old)
1317 {
1318         int i = bsearchenv(env, name, size - 1);
1319
1320         /* optionally free removed / replaced entry */
1321         if (i >= 0 && free_old)
1322                 free(env[i]);
1323
1324         if (strchr(name, '=')) {
1325                 /* if new value ('key=value') is specified, insert or replace entry */
1326                 if (i < 0) {
1327                         i = ~i;
1328                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1329                         size++;
1330                 }
1331                 env[i] = (char*) name;
1332         } else if (i >= 0) {
1333                 /* otherwise ('key') remove existing entry */
1334                 size--;
1335                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1336         }
1337         return size;
1338 }
1339
1340 char *mingw_getenv(const char *name)
1341 {
1342         char *value;
1343         int pos = bsearchenv(environ, name, environ_size - 1);
1344         if (pos < 0)
1345                 return NULL;
1346         value = strchr(environ[pos], '=');
1347         return value ? &value[1] : NULL;
1348 }
1349
1350 int mingw_putenv(const char *namevalue)
1351 {
1352         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1353         environ_size = do_putenv(environ, namevalue, environ_size, 1);
1354         return 0;
1355 }
1356
1357 /*
1358  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1359  * that service contains a numerical port, or that it is null. It
1360  * does a simple search using gethostbyname, and returns one IPv4 host
1361  * if one was found.
1362  */
1363 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1364                                    const struct addrinfo *hints,
1365                                    struct addrinfo **res)
1366 {
1367         struct hostent *h = NULL;
1368         struct addrinfo *ai;
1369         struct sockaddr_in *sin;
1370
1371         if (node) {
1372                 h = gethostbyname(node);
1373                 if (!h)
1374                         return WSAGetLastError();
1375         }
1376
1377         ai = xmalloc(sizeof(struct addrinfo));
1378         *res = ai;
1379         ai->ai_flags = 0;
1380         ai->ai_family = AF_INET;
1381         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1382         switch (ai->ai_socktype) {
1383         case SOCK_STREAM:
1384                 ai->ai_protocol = IPPROTO_TCP;
1385                 break;
1386         case SOCK_DGRAM:
1387                 ai->ai_protocol = IPPROTO_UDP;
1388                 break;
1389         default:
1390                 ai->ai_protocol = 0;
1391                 break;
1392         }
1393         ai->ai_addrlen = sizeof(struct sockaddr_in);
1394         if (hints && (hints->ai_flags & AI_CANONNAME))
1395                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1396         else
1397                 ai->ai_canonname = NULL;
1398
1399         sin = xcalloc(1, ai->ai_addrlen);
1400         sin->sin_family = AF_INET;
1401         /* Note: getaddrinfo is supposed to allow service to be a string,
1402          * which should be looked up using getservbyname. This is
1403          * currently not implemented */
1404         if (service)
1405                 sin->sin_port = htons(atoi(service));
1406         if (h)
1407                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1408         else if (hints && (hints->ai_flags & AI_PASSIVE))
1409                 sin->sin_addr.s_addr = INADDR_ANY;
1410         else
1411                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1412         ai->ai_addr = (struct sockaddr *)sin;
1413         ai->ai_next = NULL;
1414         return 0;
1415 }
1416
1417 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1418 {
1419         free(res->ai_canonname);
1420         free(res->ai_addr);
1421         free(res);
1422 }
1423
1424 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1425                                    char *host, DWORD hostlen,
1426                                    char *serv, DWORD servlen, int flags)
1427 {
1428         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1429         if (sa->sa_family != AF_INET)
1430                 return EAI_FAMILY;
1431         if (!host && !serv)
1432                 return EAI_NONAME;
1433
1434         if (host && hostlen > 0) {
1435                 struct hostent *ent = NULL;
1436                 if (!(flags & NI_NUMERICHOST))
1437                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1438                                             sizeof(sin->sin_addr), AF_INET);
1439
1440                 if (ent)
1441                         snprintf(host, hostlen, "%s", ent->h_name);
1442                 else if (flags & NI_NAMEREQD)
1443                         return EAI_NONAME;
1444                 else
1445                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1446         }
1447
1448         if (serv && servlen > 0) {
1449                 struct servent *ent = NULL;
1450                 if (!(flags & NI_NUMERICSERV))
1451                         ent = getservbyport(sin->sin_port,
1452                                             flags & NI_DGRAM ? "udp" : "tcp");
1453
1454                 if (ent)
1455                         snprintf(serv, servlen, "%s", ent->s_name);
1456                 else
1457                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1458         }
1459
1460         return 0;
1461 }
1462
1463 static HMODULE ipv6_dll = NULL;
1464 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1465 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1466                                       const struct addrinfo *hints,
1467                                       struct addrinfo **res);
1468 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1469                                       char *host, DWORD hostlen,
1470                                       char *serv, DWORD servlen, int flags);
1471 /*
1472  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1473  * don't need to try to load that one dynamically.
1474  */
1475
1476 static void socket_cleanup(void)
1477 {
1478         WSACleanup();
1479         if (ipv6_dll)
1480                 FreeLibrary(ipv6_dll);
1481         ipv6_dll = NULL;
1482         ipv6_freeaddrinfo = freeaddrinfo_stub;
1483         ipv6_getaddrinfo = getaddrinfo_stub;
1484         ipv6_getnameinfo = getnameinfo_stub;
1485 }
1486
1487 static void ensure_socket_initialization(void)
1488 {
1489         WSADATA wsa;
1490         static int initialized = 0;
1491         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1492         const char **name;
1493
1494         if (initialized)
1495                 return;
1496
1497         if (WSAStartup(MAKEWORD(2,2), &wsa))
1498                 die("unable to initialize winsock subsystem, error %d",
1499                         WSAGetLastError());
1500
1501         for (name = libraries; *name; name++) {
1502                 ipv6_dll = LoadLibrary(*name);
1503                 if (!ipv6_dll)
1504                         continue;
1505
1506                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1507                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1508                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1509                                                    const struct addrinfo *,
1510                                                    struct addrinfo **))
1511                         GetProcAddress(ipv6_dll, "getaddrinfo");
1512                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1513                                                    socklen_t, char *, DWORD,
1514                                                    char *, DWORD, int))
1515                         GetProcAddress(ipv6_dll, "getnameinfo");
1516                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1517                         FreeLibrary(ipv6_dll);
1518                         ipv6_dll = NULL;
1519                 } else
1520                         break;
1521         }
1522         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1523                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1524                 ipv6_getaddrinfo = getaddrinfo_stub;
1525                 ipv6_getnameinfo = getnameinfo_stub;
1526         }
1527
1528         atexit(socket_cleanup);
1529         initialized = 1;
1530 }
1531
1532 #undef gethostname
1533 int mingw_gethostname(char *name, int namelen)
1534 {
1535     ensure_socket_initialization();
1536     return gethostname(name, namelen);
1537 }
1538
1539 #undef gethostbyname
1540 struct hostent *mingw_gethostbyname(const char *host)
1541 {
1542         ensure_socket_initialization();
1543         return gethostbyname(host);
1544 }
1545
1546 void mingw_freeaddrinfo(struct addrinfo *res)
1547 {
1548         ipv6_freeaddrinfo(res);
1549 }
1550
1551 int mingw_getaddrinfo(const char *node, const char *service,
1552                       const struct addrinfo *hints, struct addrinfo **res)
1553 {
1554         ensure_socket_initialization();
1555         return ipv6_getaddrinfo(node, service, hints, res);
1556 }
1557
1558 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1559                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1560                       int flags)
1561 {
1562         ensure_socket_initialization();
1563         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1564 }
1565
1566 int mingw_socket(int domain, int type, int protocol)
1567 {
1568         int sockfd;
1569         SOCKET s;
1570
1571         ensure_socket_initialization();
1572         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1573         if (s == INVALID_SOCKET) {
1574                 /*
1575                  * WSAGetLastError() values are regular BSD error codes
1576                  * biased by WSABASEERR.
1577                  * However, strerror() does not know about networking
1578                  * specific errors, which are values beginning at 38 or so.
1579                  * Therefore, we choose to leave the biased error code
1580                  * in errno so that _if_ someone looks up the code somewhere,
1581                  * then it is at least the number that are usually listed.
1582                  */
1583                 errno = WSAGetLastError();
1584                 return -1;
1585         }
1586         /* convert into a file descriptor */
1587         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1588                 closesocket(s);
1589                 return error("unable to make a socket file descriptor: %s",
1590                         strerror(errno));
1591         }
1592         return sockfd;
1593 }
1594
1595 #undef connect
1596 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1597 {
1598         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1599         return connect(s, sa, sz);
1600 }
1601
1602 #undef bind
1603 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1604 {
1605         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1606         return bind(s, sa, sz);
1607 }
1608
1609 #undef setsockopt
1610 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1611 {
1612         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1613         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1614 }
1615
1616 #undef shutdown
1617 int mingw_shutdown(int sockfd, int how)
1618 {
1619         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1620         return shutdown(s, how);
1621 }
1622
1623 #undef listen
1624 int mingw_listen(int sockfd, int backlog)
1625 {
1626         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1627         return listen(s, backlog);
1628 }
1629
1630 #undef accept
1631 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1632 {
1633         int sockfd2;
1634
1635         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1636         SOCKET s2 = accept(s1, sa, sz);
1637
1638         /* convert into a file descriptor */
1639         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1640                 int err = errno;
1641                 closesocket(s2);
1642                 return error("unable to make a socket file descriptor: %s",
1643                         strerror(err));
1644         }
1645         return sockfd2;
1646 }
1647
1648 #undef rename
1649 int mingw_rename(const char *pold, const char *pnew)
1650 {
1651         DWORD attrs, gle;
1652         int tries = 0;
1653         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1654         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1655                 return -1;
1656
1657         /*
1658          * Try native rename() first to get errno right.
1659          * It is based on MoveFile(), which cannot overwrite existing files.
1660          */
1661         if (!_wrename(wpold, wpnew))
1662                 return 0;
1663         if (errno != EEXIST)
1664                 return -1;
1665 repeat:
1666         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1667                 return 0;
1668         /* TODO: translate more errors */
1669         gle = GetLastError();
1670         if (gle == ERROR_ACCESS_DENIED &&
1671             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1672                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1673                         DWORD attrsold = GetFileAttributesW(wpold);
1674                         if (attrsold == INVALID_FILE_ATTRIBUTES ||
1675                             !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1676                                 errno = EISDIR;
1677                         else if (!_wrmdir(wpnew))
1678                                 goto repeat;
1679                         return -1;
1680                 }
1681                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1682                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1683                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1684                                 return 0;
1685                         gle = GetLastError();
1686                         /* revert file attributes on failure */
1687                         SetFileAttributesW(wpnew, attrs);
1688                 }
1689         }
1690         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1691                 /*
1692                  * We assume that some other process had the source or
1693                  * destination file open at the wrong moment and retry.
1694                  * In order to give the other process a higher chance to
1695                  * complete its operation, we give up our time slice now.
1696                  * If we have to retry again, we do sleep a bit.
1697                  */
1698                 Sleep(delay[tries]);
1699                 tries++;
1700                 goto repeat;
1701         }
1702         if (gle == ERROR_ACCESS_DENIED &&
1703                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1704                        "Should I try again?", pold, pnew))
1705                 goto repeat;
1706
1707         errno = EACCES;
1708         return -1;
1709 }
1710
1711 /*
1712  * Note that this doesn't return the actual pagesize, but
1713  * the allocation granularity. If future Windows specific git code
1714  * needs the real getpagesize function, we need to find another solution.
1715  */
1716 int mingw_getpagesize(void)
1717 {
1718         SYSTEM_INFO si;
1719         GetSystemInfo(&si);
1720         return si.dwAllocationGranularity;
1721 }
1722
1723 struct passwd *getpwuid(int uid)
1724 {
1725         static char user_name[100];
1726         static struct passwd p;
1727
1728         DWORD len = sizeof(user_name);
1729         if (!GetUserName(user_name, &len))
1730                 return NULL;
1731         p.pw_name = user_name;
1732         p.pw_gecos = "unknown";
1733         p.pw_dir = NULL;
1734         return &p;
1735 }
1736
1737 static HANDLE timer_event;
1738 static HANDLE timer_thread;
1739 static int timer_interval;
1740 static int one_shot;
1741 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1742
1743 /* The timer works like this:
1744  * The thread, ticktack(), is a trivial routine that most of the time
1745  * only waits to receive the signal to terminate. The main thread tells
1746  * the thread to terminate by setting the timer_event to the signalled
1747  * state.
1748  * But ticktack() interrupts the wait state after the timer's interval
1749  * length to call the signal handler.
1750  */
1751
1752 static unsigned __stdcall ticktack(void *dummy)
1753 {
1754         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1755                 mingw_raise(SIGALRM);
1756                 if (one_shot)
1757                         break;
1758         }
1759         return 0;
1760 }
1761
1762 static int start_timer_thread(void)
1763 {
1764         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1765         if (timer_event) {
1766                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1767                 if (!timer_thread )
1768                         return errno = ENOMEM,
1769                                 error("cannot start timer thread");
1770         } else
1771                 return errno = ENOMEM,
1772                         error("cannot allocate resources for timer");
1773         return 0;
1774 }
1775
1776 static void stop_timer_thread(void)
1777 {
1778         if (timer_event)
1779                 SetEvent(timer_event);  /* tell thread to terminate */
1780         if (timer_thread) {
1781                 int rc = WaitForSingleObject(timer_thread, 1000);
1782                 if (rc == WAIT_TIMEOUT)
1783                         error("timer thread did not terminate timely");
1784                 else if (rc != WAIT_OBJECT_0)
1785                         error("waiting for timer thread failed: %lu",
1786                               GetLastError());
1787                 CloseHandle(timer_thread);
1788         }
1789         if (timer_event)
1790                 CloseHandle(timer_event);
1791         timer_event = NULL;
1792         timer_thread = NULL;
1793 }
1794
1795 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1796 {
1797         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1798 }
1799
1800 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1801 {
1802         static const struct timeval zero;
1803         static int atexit_done;
1804
1805         if (out != NULL)
1806                 return errno = EINVAL,
1807                         error("setitimer param 3 != NULL not implemented");
1808         if (!is_timeval_eq(&in->it_interval, &zero) &&
1809             !is_timeval_eq(&in->it_interval, &in->it_value))
1810                 return errno = EINVAL,
1811                         error("setitimer: it_interval must be zero or eq it_value");
1812
1813         if (timer_thread)
1814                 stop_timer_thread();
1815
1816         if (is_timeval_eq(&in->it_value, &zero) &&
1817             is_timeval_eq(&in->it_interval, &zero))
1818                 return 0;
1819
1820         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1821         one_shot = is_timeval_eq(&in->it_interval, &zero);
1822         if (!atexit_done) {
1823                 atexit(stop_timer_thread);
1824                 atexit_done = 1;
1825         }
1826         return start_timer_thread();
1827 }
1828
1829 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1830 {
1831         if (sig != SIGALRM)
1832                 return errno = EINVAL,
1833                         error("sigaction only implemented for SIGALRM");
1834         if (out != NULL)
1835                 return errno = EINVAL,
1836                         error("sigaction: param 3 != NULL not implemented");
1837
1838         timer_fn = in->sa_handler;
1839         return 0;
1840 }
1841
1842 #undef signal
1843 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1844 {
1845         sig_handler_t old;
1846
1847         switch (sig) {
1848         case SIGALRM:
1849                 old = timer_fn;
1850                 timer_fn = handler;
1851                 break;
1852
1853         case SIGINT:
1854                 old = sigint_fn;
1855                 sigint_fn = handler;
1856                 break;
1857
1858         default:
1859                 return signal(sig, handler);
1860         }
1861
1862         return old;
1863 }
1864
1865 #undef raise
1866 int mingw_raise(int sig)
1867 {
1868         switch (sig) {
1869         case SIGALRM:
1870                 if (timer_fn == SIG_DFL) {
1871                         if (isatty(STDERR_FILENO))
1872                                 fputs("Alarm clock\n", stderr);
1873                         exit(128 + SIGALRM);
1874                 } else if (timer_fn != SIG_IGN)
1875                         timer_fn(SIGALRM);
1876                 return 0;
1877
1878         case SIGINT:
1879                 if (sigint_fn == SIG_DFL)
1880                         exit(128 + SIGINT);
1881                 else if (sigint_fn != SIG_IGN)
1882                         sigint_fn(SIGINT);
1883                 return 0;
1884
1885         default:
1886                 return raise(sig);
1887         }
1888 }
1889
1890 int link(const char *oldpath, const char *newpath)
1891 {
1892         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1893         static T create_hard_link = NULL;
1894         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1895         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1896                 xutftowcs_path(wnewpath, newpath) < 0)
1897                 return -1;
1898
1899         if (!create_hard_link) {
1900                 create_hard_link = (T) GetProcAddress(
1901                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1902                 if (!create_hard_link)
1903                         create_hard_link = (T)-1;
1904         }
1905         if (create_hard_link == (T)-1) {
1906                 errno = ENOSYS;
1907                 return -1;
1908         }
1909         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1910                 errno = err_win_to_posix(GetLastError());
1911                 return -1;
1912         }
1913         return 0;
1914 }
1915
1916 pid_t waitpid(pid_t pid, int *status, int options)
1917 {
1918         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1919             FALSE, pid);
1920         if (!h) {
1921                 errno = ECHILD;
1922                 return -1;
1923         }
1924
1925         if (pid > 0 && options & WNOHANG) {
1926                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1927                         CloseHandle(h);
1928                         return 0;
1929                 }
1930                 options &= ~WNOHANG;
1931         }
1932
1933         if (options == 0) {
1934                 struct pinfo_t **ppinfo;
1935                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1936                         CloseHandle(h);
1937                         return 0;
1938                 }
1939
1940                 if (status)
1941                         GetExitCodeProcess(h, (LPDWORD)status);
1942
1943                 EnterCriticalSection(&pinfo_cs);
1944
1945                 ppinfo = &pinfo;
1946                 while (*ppinfo) {
1947                         struct pinfo_t *info = *ppinfo;
1948                         if (info->pid == pid) {
1949                                 CloseHandle(info->proc);
1950                                 *ppinfo = info->next;
1951                                 free(info);
1952                                 break;
1953                         }
1954                         ppinfo = &info->next;
1955                 }
1956
1957                 LeaveCriticalSection(&pinfo_cs);
1958
1959                 CloseHandle(h);
1960                 return pid;
1961         }
1962         CloseHandle(h);
1963
1964         errno = EINVAL;
1965         return -1;
1966 }
1967
1968 int mingw_skip_dos_drive_prefix(char **path)
1969 {
1970         int ret = has_dos_drive_prefix(*path);
1971         *path += ret;
1972         return ret;
1973 }
1974
1975 int mingw_offset_1st_component(const char *path)
1976 {
1977         char *pos = (char *)path;
1978
1979         /* unc paths */
1980         if (!skip_dos_drive_prefix(&pos) &&
1981                         is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
1982                 /* skip server name */
1983                 pos = strpbrk(pos + 2, "\\/");
1984                 if (!pos)
1985                         return 0; /* Error: malformed unc path */
1986
1987                 do {
1988                         pos++;
1989                 } while (*pos && !is_dir_sep(*pos));
1990         }
1991
1992         return pos + is_dir_sep(*pos) - path;
1993 }
1994
1995 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1996 {
1997         int upos = 0, wpos = 0;
1998         const unsigned char *utf = (const unsigned char*) utfs;
1999         if (!utf || !wcs || wcslen < 1) {
2000                 errno = EINVAL;
2001                 return -1;
2002         }
2003         /* reserve space for \0 */
2004         wcslen--;
2005         if (utflen < 0)
2006                 utflen = INT_MAX;
2007
2008         while (upos < utflen) {
2009                 int c = utf[upos++] & 0xff;
2010                 if (utflen == INT_MAX && c == 0)
2011                         break;
2012
2013                 if (wpos >= wcslen) {
2014                         wcs[wpos] = 0;
2015                         errno = ERANGE;
2016                         return -1;
2017                 }
2018
2019                 if (c < 0x80) {
2020                         /* ASCII */
2021                         wcs[wpos++] = c;
2022                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2023                                 (utf[upos] & 0xc0) == 0x80) {
2024                         /* 2-byte utf-8 */
2025                         c = ((c & 0x1f) << 6);
2026                         c |= (utf[upos++] & 0x3f);
2027                         wcs[wpos++] = c;
2028                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2029                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2030                                 (utf[upos] & 0xc0) == 0x80 &&
2031                                 (utf[upos + 1] & 0xc0) == 0x80) {
2032                         /* 3-byte utf-8 */
2033                         c = ((c & 0x0f) << 12);
2034                         c |= ((utf[upos++] & 0x3f) << 6);
2035                         c |= (utf[upos++] & 0x3f);
2036                         wcs[wpos++] = c;
2037                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2038                                 wpos + 1 < wcslen &&
2039                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2040                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2041                                 (utf[upos] & 0xc0) == 0x80 &&
2042                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2043                                 (utf[upos + 2] & 0xc0) == 0x80) {
2044                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2045                         c = ((c & 0x07) << 18);
2046                         c |= ((utf[upos++] & 0x3f) << 12);
2047                         c |= ((utf[upos++] & 0x3f) << 6);
2048                         c |= (utf[upos++] & 0x3f);
2049                         c -= 0x10000;
2050                         wcs[wpos++] = 0xd800 | (c >> 10);
2051                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2052                 } else if (c >= 0xa0) {
2053                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2054                         wcs[wpos++] = c;
2055                 } else {
2056                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2057                         static const char *hex = "0123456789abcdef";
2058                         wcs[wpos++] = hex[c >> 4];
2059                         if (wpos < wcslen)
2060                                 wcs[wpos++] = hex[c & 0x0f];
2061                 }
2062         }
2063         wcs[wpos] = 0;
2064         return wpos;
2065 }
2066
2067 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2068 {
2069         if (!wcs || !utf || utflen < 1) {
2070                 errno = EINVAL;
2071                 return -1;
2072         }
2073         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2074         if (utflen)
2075                 return utflen - 1;
2076         errno = ERANGE;
2077         return -1;
2078 }
2079
2080 static void setup_windows_environment(void)
2081 {
2082         char *tmp = getenv("TMPDIR");
2083
2084         /* on Windows it is TMP and TEMP */
2085         if (!tmp) {
2086                 if (!(tmp = getenv("TMP")))
2087                         tmp = getenv("TEMP");
2088                 if (tmp) {
2089                         setenv("TMPDIR", tmp, 1);
2090                         tmp = getenv("TMPDIR");
2091                 }
2092         }
2093
2094         if (tmp) {
2095                 /*
2096                  * Convert all dir separators to forward slashes,
2097                  * to help shell commands called from the Git
2098                  * executable (by not mistaking the dir separators
2099                  * for escape characters).
2100                  */
2101                 convert_slashes(tmp);
2102         }
2103
2104         /* simulate TERM to enable auto-color (see color.c) */
2105         if (!getenv("TERM"))
2106                 setenv("TERM", "cygwin", 1);
2107 }
2108
2109 /*
2110  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2111  * mingw startup code, see init.c in mingw runtime).
2112  */
2113 int _CRT_glob = 0;
2114
2115 typedef struct {
2116         int newmode;
2117 } _startupinfo;
2118
2119 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2120                 _startupinfo *si);
2121
2122 static NORETURN void die_startup(void)
2123 {
2124         fputs("fatal: not enough memory for initialization", stderr);
2125         exit(128);
2126 }
2127
2128 static void *malloc_startup(size_t size)
2129 {
2130         void *result = malloc(size);
2131         if (!result)
2132                 die_startup();
2133         return result;
2134 }
2135
2136 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2137 {
2138         len = xwcstoutf(buffer, wcs, len) + 1;
2139         return memcpy(malloc_startup(len), buffer, len);
2140 }
2141
2142 void mingw_startup(void)
2143 {
2144         int i, maxlen, argc;
2145         char *buffer;
2146         wchar_t **wenv, **wargv;
2147         _startupinfo si;
2148
2149         /* get wide char arguments and environment */
2150         si.newmode = 0;
2151         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2152                 die_startup();
2153
2154         /* determine size of argv and environ conversion buffer */
2155         maxlen = wcslen(_wpgmptr);
2156         for (i = 1; i < argc; i++)
2157                 maxlen = max(maxlen, wcslen(wargv[i]));
2158         for (i = 0; wenv[i]; i++)
2159                 maxlen = max(maxlen, wcslen(wenv[i]));
2160
2161         /*
2162          * nedmalloc can't free CRT memory, allocate resizable environment
2163          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2164          * use it while initializing the environment itself.
2165          */
2166         environ_size = i + 1;
2167         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2168         environ = malloc_startup(environ_alloc);
2169
2170         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2171         maxlen = 3 * maxlen + 1;
2172         buffer = malloc_startup(maxlen);
2173
2174         /* convert command line arguments and environment to UTF-8 */
2175         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2176         for (i = 1; i < argc; i++)
2177                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2178         for (i = 0; wenv[i]; i++)
2179                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2180         environ[i] = NULL;
2181         free(buffer);
2182
2183         /* sort environment for O(log n) getenv / putenv */
2184         qsort(environ, i, sizeof(char*), compareenv);
2185
2186         /* fix Windows specific environment settings */
2187         setup_windows_environment();
2188
2189         /* initialize critical section for waitpid pinfo_t list */
2190         InitializeCriticalSection(&pinfo_cs);
2191
2192         /* set up default file mode and file modes for stdin/out/err */
2193         _fmode = _O_BINARY;
2194         _setmode(_fileno(stdin), _O_BINARY);
2195         _setmode(_fileno(stdout), _O_BINARY);
2196         _setmode(_fileno(stderr), _O_BINARY);
2197
2198         /* initialize Unicode console */
2199         winansi_init();
2200 }
2201
2202 int uname(struct utsname *buf)
2203 {
2204         unsigned v = (unsigned)GetVersion();
2205         memset(buf, 0, sizeof(*buf));
2206         xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2207         xsnprintf(buf->release, sizeof(buf->release),
2208                  "%u.%u", v & 0xff, (v >> 8) & 0xff);
2209         /* assuming NT variants only.. */
2210         xsnprintf(buf->version, sizeof(buf->version),
2211                   "%u", (v >> 16) & 0x7fff);
2212         return 0;
2213 }