compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5
   6 #include <shellapi.h>
   7
   8 static int err_win_to_posix(DWORD winerr)
   9 {
  10         int error = ENOSYS;
  11         switch(winerr) {
  12         case ERROR_ACCESS_DENIED: error = EACCES; break;
  13         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  14         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  15         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  16         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  17         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  18         case ERROR_BAD_COMMAND: error = EIO; break;
  19         case ERROR_BAD_DEVICE: error = ENODEV; break;
  20         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  21         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  22         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  23         case ERROR_BAD_LENGTH: error = EINVAL; break;
  24         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  25         case ERROR_BAD_PIPE: error = EPIPE; break;
  26         case ERROR_BAD_UNIT: error = ENODEV; break;
  27         case ERROR_BAD_USERNAME: error = EINVAL; break;
  28         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  29         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  30         case ERROR_BUSY: error = EBUSY; break;
  31         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  32         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  33         case ERROR_CANNOT_MAKE: error = EACCES; break;
  34         case ERROR_CANTOPEN: error = EIO; break;
  35         case ERROR_CANTREAD: error = EIO; break;
  36         case ERROR_CANTWRITE: error = EIO; break;
  37         case ERROR_CRC: error = EIO; break;
  38         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  39         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  40         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  41         case ERROR_DIRECTORY: error = EINVAL; break;
  42         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  43         case ERROR_DISK_CHANGE: error = EIO; break;
  44         case ERROR_DISK_FULL: error = ENOSPC; break;
  45         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  46         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  47         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  48         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  49         case ERROR_FILE_EXISTS: error = EEXIST; break;
  50         case ERROR_FILE_INVALID: error = ENODEV; break;
  51         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  52         case ERROR_GEN_FAILURE: error = EIO; break;
  53         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  54         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  55         case ERROR_INVALID_ACCESS: error = EACCES; break;
  56         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  57         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  58         case ERROR_INVALID_DATA: error = EINVAL; break;
  59         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  60         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  61         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  62         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  63         case ERROR_INVALID_HANDLE: error = EBADF; break;
  64         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  65         case ERROR_INVALID_NAME: error = EINVAL; break;
  66         case ERROR_INVALID_OWNER: error = EINVAL; break;
  67         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  68         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  69         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  70         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  71         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  72         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  73         case ERROR_IO_DEVICE: error = EIO; break;
  74         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  75         case ERROR_LOCKED: error = EBUSY; break;
  76         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  77         case ERROR_LOGON_FAILURE: error = EACCES; break;
  78         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  79         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  80         case ERROR_MORE_DATA: error = EPIPE; break;
  81         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  82         case ERROR_NOACCESS: error = EFAULT; break;
  83         case ERROR_NONE_MAPPED: error = EINVAL; break;
  84         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  85         case ERROR_NOT_READY: error = EAGAIN; break;
  86         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  87         case ERROR_NO_DATA: error = EPIPE; break;
  88         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  89         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  90         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  91         case ERROR_OPEN_FAILED: error = EIO; break;
  92         case ERROR_OPEN_FILES: error = EBUSY; break;
  93         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  94         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  95         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  96         case ERROR_PATH_BUSY: error = EBUSY; break;
  97         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  98         case ERROR_PIPE_BUSY: error = EBUSY; break;
  99         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 100         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 101         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 102         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 103         case ERROR_READ_FAULT: error = EIO; break;
 104         case ERROR_SEEK: error = EIO; break;
 105         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 106         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 107         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 108         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 109         case ERROR_SWAPERROR: error = ENOENT; break;
 110         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 111         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 112         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 113         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 114         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 115         case ERROR_WRITE_FAULT: error = EIO; break;
 116         case ERROR_WRITE_PROTECT: error = EROFS; break;
 117         }
 118         return error;
 119 }
 120
 121 #undef open
 122 int mingw_open (const char *filename, int oflags, ...)
 123 {
 124         va_list args;
 125         unsigned mode;
 126         int fd;
 127
 128         va_start(args, oflags);
 129         mode = va_arg(args, int);
 130         va_end(args);
 131
 132         if (!strcmp(filename, "/dev/null"))
 133                 filename = "nul";
 134
 135         fd = open(filename, oflags, mode);
 136
 137         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 138                 DWORD attrs = GetFileAttributes(filename);
 139                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 140                         errno = EISDIR;
 141         }
 142         return fd;
 143 }
 144
 145 static inline time_t filetime_to_time_t(const FILETIME *ft)
 146 {
 147         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 148         winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
 149         winTime /= 10000000;             /* Nano to seconds resolution */
 150         return (time_t)winTime;
 151 }
 152
 153 /* We keep the do_lstat code in a separate function to avoid recursion.
 154  * When a path ends with a slash, the stat will fail with ENOENT. In
 155  * this case, we strip the trailing slashes and stat again.
 156  */
 157 static int do_lstat(const char *file_name, struct stat *buf)
 158 {
 159         WIN32_FILE_ATTRIBUTE_DATA fdata;
 160
 161         if (!(errno = get_file_attr(file_name, &fdata))) {
 162                 buf->st_ino = 0;
 163                 buf->st_gid = 0;
 164                 buf->st_uid = 0;
 165                 buf->st_nlink = 1;
 166                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 167                 buf->st_size = fdata.nFileSizeLow |
 168                         (((off_t)fdata.nFileSizeHigh)<<32);
 169                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 170                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 171                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 172                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 173                 return 0;
 174         }
 175         return -1;
 176 }
 177
 178 /* We provide our own lstat/fstat functions, since the provided
 179  * lstat/fstat functions are so slow. These stat functions are
 180  * tailored for Git's usage (read: fast), and are not meant to be
 181  * complete. Note that Git stat()s are redirected to mingw_lstat()
 182  * too, since Windows doesn't really handle symlinks that well.
 183  */
 184 int mingw_lstat(const char *file_name, struct stat *buf)
 185 {
 186         int namelen;
 187         static char alt_name[PATH_MAX];
 188
 189         if (!do_lstat(file_name, buf))
 190                 return 0;
 191
 192         /* if file_name ended in a '/', Windows returned ENOENT;
 193          * try again without trailing slashes
 194          */
 195         if (errno != ENOENT)
 196                 return -1;
 197
 198         namelen = strlen(file_name);
 199         if (namelen && file_name[namelen-1] != '/')
 200                 return -1;
 201         while (namelen && file_name[namelen-1] == '/')
 202                 --namelen;
 203         if (!namelen || namelen >= PATH_MAX)
 204                 return -1;
 205
 206         memcpy(alt_name, file_name, namelen);
 207         alt_name[namelen] = 0;
 208         return do_lstat(alt_name, buf);
 209 }
 210
 211 #undef fstat
 212 int mingw_fstat(int fd, struct stat *buf)
 213 {
 214         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 215         BY_HANDLE_FILE_INFORMATION fdata;
 216
 217         if (fh == INVALID_HANDLE_VALUE) {
 218                 errno = EBADF;
 219                 return -1;
 220         }
 221         /* direct non-file handles to MS's fstat() */
 222         if (GetFileType(fh) != FILE_TYPE_DISK)
 223                 return _fstati64(fd, buf);
 224
 225         if (GetFileInformationByHandle(fh, &fdata)) {
 226                 buf->st_ino = 0;
 227                 buf->st_gid = 0;
 228                 buf->st_uid = 0;
 229                 buf->st_nlink = 1;
 230                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 231                 buf->st_size = fdata.nFileSizeLow |
 232                         (((off_t)fdata.nFileSizeHigh)<<32);
 233                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 234                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 235                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 236                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 237                 return 0;
 238         }
 239         errno = EBADF;
 240         return -1;
 241 }
 242
 243 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 244 {
 245         long long winTime = t * 10000000LL + 116444736000000000LL;
 246         ft->dwLowDateTime = winTime;
 247         ft->dwHighDateTime = winTime >> 32;
 248 }
 249
 250 int mingw_utime (const char *file_name, const struct utimbuf *times)
 251 {
 252         FILETIME mft, aft;
 253         int fh, rc;
 254
 255         /* must have write permission */
 256         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 257                 return -1;
 258
 259         time_t_to_filetime(times->modtime, &mft);
 260         time_t_to_filetime(times->actime, &aft);
 261         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 262                 errno = EINVAL;
 263                 rc = -1;
 264         } else
 265                 rc = 0;
 266         close(fh);
 267         return rc;
 268 }
 269
 270 unsigned int sleep (unsigned int seconds)
 271 {
 272         Sleep(seconds*1000);
 273         return 0;
 274 }
 275
 276 int mkstemp(char *template)
 277 {
 278         char *filename = mktemp(template);
 279         if (filename == NULL)
 280                 return -1;
 281         return open(filename, O_RDWR | O_CREAT, 0600);
 282 }
 283
 284 int gettimeofday(struct timeval *tv, void *tz)
 285 {
 286         SYSTEMTIME st;
 287         struct tm tm;
 288         GetSystemTime(&st);
 289         tm.tm_year = st.wYear-1900;
 290         tm.tm_mon = st.wMonth-1;
 291         tm.tm_mday = st.wDay;
 292         tm.tm_hour = st.wHour;
 293         tm.tm_min = st.wMinute;
 294         tm.tm_sec = st.wSecond;
 295         tv->tv_sec = tm_to_time_t(&tm);
 296         if (tv->tv_sec < 0)
 297                 return -1;
 298         tv->tv_usec = st.wMilliseconds*1000;
 299         return 0;
 300 }
 301
 302 int pipe(int filedes[2])
 303 {
 304         int fd;
 305         HANDLE h[2], parent;
 306
 307         if (_pipe(filedes, 8192, 0) < 0)
 308                 return -1;
 309
 310         parent = GetCurrentProcess();
 311
 312         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 313                         parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 314                 close(filedes[0]);
 315                 close(filedes[1]);
 316                 return -1;
 317         }
 318         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 319                         parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 320                 close(filedes[0]);
 321                 close(filedes[1]);
 322                 CloseHandle(h[0]);
 323                 return -1;
 324         }
 325         fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 326         if (fd < 0) {
 327                 close(filedes[0]);
 328                 close(filedes[1]);
 329                 CloseHandle(h[0]);
 330                 CloseHandle(h[1]);
 331                 return -1;
 332         }
 333         close(filedes[0]);
 334         filedes[0] = fd;
 335         fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 336         if (fd < 0) {
 337                 close(filedes[0]);
 338                 close(filedes[1]);
 339                 CloseHandle(h[1]);
 340                 return -1;
 341         }
 342         close(filedes[1]);
 343         filedes[1] = fd;
 344         return 0;
 345 }
 346
 347 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 348 {
 349         int i, pending;
 350
 351         if (timeout >= 0) {
 352                 if (nfds == 0) {
 353                         Sleep(timeout);
 354                         return 0;
 355                 }
 356                 return errno = EINVAL, error("poll timeout not supported");
 357         }
 358
 359         /* When there is only one fd to wait for, then we pretend that
 360          * input is available and let the actual wait happen when the
 361          * caller invokes read().
 362          */
 363         if (nfds == 1) {
 364                 if (!(ufds[0].events & POLLIN))
 365                         return errno = EINVAL, error("POLLIN not set");
 366                 ufds[0].revents = POLLIN;
 367                 return 0;
 368         }
 369
 370 repeat:
 371         pending = 0;
 372         for (i = 0; i < nfds; i++) {
 373                 DWORD avail = 0;
 374                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 375                 if (h == INVALID_HANDLE_VALUE)
 376                         return -1;      /* errno was set */
 377
 378                 if (!(ufds[i].events & POLLIN))
 379                         return errno = EINVAL, error("POLLIN not set");
 380
 381                 /* this emulation works only for pipes */
 382                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 383                         int err = GetLastError();
 384                         if (err == ERROR_BROKEN_PIPE) {
 385                                 ufds[i].revents = POLLHUP;
 386                                 pending++;
 387                         } else {
 388                                 errno = EINVAL;
 389                                 return error("PeekNamedPipe failed,"
 390                                         " GetLastError: %u", err);
 391                         }
 392                 } else if (avail) {
 393                         ufds[i].revents = POLLIN;
 394                         pending++;
 395                 } else
 396                         ufds[i].revents = 0;
 397         }
 398         if (!pending) {
 399                 /* The only times that we spin here is when the process
 400                  * that is connected through the pipes is waiting for
 401                  * its own input data to become available. But since
 402                  * the process (pack-objects) is itself CPU intensive,
 403                  * it will happily pick up the time slice that we are
 404                  * relinquishing here.
 405                  */
 406                 Sleep(0);
 407                 goto repeat;
 408         }
 409         return 0;
 410 }
 411
 412 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 413 {
 414         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 415         memcpy(result, gmtime(timep), sizeof(struct tm));
 416         return result;
 417 }
 418
 419 struct tm *localtime_r(const time_t *timep, struct tm *result)
 420 {
 421         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 422         memcpy(result, localtime(timep), sizeof(struct tm));
 423         return result;
 424 }
 425
 426 #undef getcwd
 427 char *mingw_getcwd(char *pointer, int len)
 428 {
 429         int i;
 430         char *ret = getcwd(pointer, len);
 431         if (!ret)
 432                 return ret;
 433         for (i = 0; pointer[i]; i++)
 434                 if (pointer[i] == '\\')
 435                         pointer[i] = '/';
 436         return ret;
 437 }
 438
 439 #undef getenv
 440 char *mingw_getenv(const char *name)
 441 {
 442         char *result = getenv(name);
 443         if (!result && !strcmp(name, "TMPDIR")) {
 444                 /* on Windows it is TMP and TEMP */
 445                 result = getenv("TMP");
 446                 if (!result)
 447                         result = getenv("TEMP");
 448         }
 449         return result;
 450 }
 451
 452 /*
 453  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 454  * (Parsing C++ Command-Line Arguments)
 455  */
 456 static const char *quote_arg(const char *arg)
 457 {
 458         /* count chars to quote */
 459         int len = 0, n = 0;
 460         int force_quotes = 0;
 461         char *q, *d;
 462         const char *p = arg;
 463         if (!*p) force_quotes = 1;
 464         while (*p) {
 465                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 466                         force_quotes = 1;
 467                 else if (*p == '"')
 468                         n++;
 469                 else if (*p == '\\') {
 470                         int count = 0;
 471                         while (*p == '\\') {
 472                                 count++;
 473                                 p++;
 474                                 len++;
 475                         }
 476                         if (*p == '"')
 477                                 n += count*2 + 1;
 478                         continue;
 479                 }
 480                 len++;
 481                 p++;
 482         }
 483         if (!force_quotes && n == 0)
 484                 return arg;
 485
 486         /* insert \ where necessary */
 487         d = q = xmalloc(len+n+3);
 488         *d++ = '"';
 489         while (*arg) {
 490                 if (*arg == '"')
 491                         *d++ = '\\';
 492                 else if (*arg == '\\') {
 493                         int count = 0;
 494                         while (*arg == '\\') {
 495                                 count++;
 496                                 *d++ = *arg++;
 497                         }
 498                         if (*arg == '"') {
 499                                 while (count-- > 0)
 500                                         *d++ = '\\';
 501                                 *d++ = '\\';
 502                         }
 503                 }
 504                 *d++ = *arg++;
 505         }
 506         *d++ = '"';
 507         *d++ = 0;
 508         return q;
 509 }
 510
 511 static const char *parse_interpreter(const char *cmd)
 512 {
 513         static char buf[100];
 514         char *p, *opt;
 515         int n, fd;
 516
 517         /* don't even try a .exe */
 518         n = strlen(cmd);
 519         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 520                 return NULL;
 521
 522         fd = open(cmd, O_RDONLY);
 523         if (fd < 0)
 524                 return NULL;
 525         n = read(fd, buf, sizeof(buf)-1);
 526         close(fd);
 527         if (n < 4)      /* at least '#!/x' and not error */
 528                 return NULL;
 529
 530         if (buf[0] != '#' || buf[1] != '!')
 531                 return NULL;
 532         buf[n] = '\0';
 533         p = buf + strcspn(buf, "\r\n");
 534         if (!*p)
 535                 return NULL;
 536
 537         *p = '\0';
 538         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 539                 return NULL;
 540         /* strip options */
 541         if ((opt = strchr(p+1, ' ')))
 542                 *opt = '\0';
 543         return p+1;
 544 }
 545
 546 /*
 547  * Splits the PATH into parts.
 548  */
 549 static char **get_path_split(void)
 550 {
 551         char *p, **path, *envpath = getenv("PATH");
 552         int i, n = 0;
 553
 554         if (!envpath || !*envpath)
 555                 return NULL;
 556
 557         envpath = xstrdup(envpath);
 558         p = envpath;
 559         while (p) {
 560                 char *dir = p;
 561                 p = strchr(p, ';');
 562                 if (p) *p++ = '\0';
 563                 if (*dir) {     /* not earlier, catches series of ; */
 564                         ++n;
 565                 }
 566         }
 567         if (!n)
 568                 return NULL;
 569
 570         path = xmalloc((n+1)*sizeof(char *));
 571         p = envpath;
 572         i = 0;
 573         do {
 574                 if (*p)
 575                         path[i++] = xstrdup(p);
 576                 p = p+strlen(p)+1;
 577         } while (i < n);
 578         path[i] = NULL;
 579
 580         free(envpath);
 581
 582         return path;
 583 }
 584
 585 static void free_path_split(char **path)
 586 {
 587         char **p = path;
 588
 589         if (!path)
 590                 return;
 591
 592         while (*p)
 593                 free(*p++);
 594         free(path);
 595 }
 596
 597 /*
 598  * exe_only means that we only want to detect .exe files, but not scripts
 599  * (which do not have an extension)
 600  */
 601 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 602 {
 603         char path[MAX_PATH];
 604         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 605
 606         if (!isexe && access(path, F_OK) == 0)
 607                 return xstrdup(path);
 608         path[strlen(path)-4] = '\0';
 609         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 610                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 611                         return xstrdup(path);
 612         return NULL;
 613 }
 614
 615 /*
 616  * Determines the absolute path of cmd using the the split path in path.
 617  * If cmd contains a slash or backslash, no lookup is performed.
 618  */
 619 static char *path_lookup(const char *cmd, char **path, int exe_only)
 620 {
 621         char *prog = NULL;
 622         int len = strlen(cmd);
 623         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 624
 625         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 626                 prog = xstrdup(cmd);
 627
 628         while (!prog && *path)
 629                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 630
 631         return prog;
 632 }
 633
 634 static int env_compare(const void *a, const void *b)
 635 {
 636         char *const *ea = a;
 637         char *const *eb = b;
 638         return strcasecmp(*ea, *eb);
 639 }
 640
 641 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 642                            int prepend_cmd)
 643 {
 644         STARTUPINFO si;
 645         PROCESS_INFORMATION pi;
 646         struct strbuf envblk, args;
 647         unsigned flags;
 648         BOOL ret;
 649
 650         /* Determine whether or not we are associated to a console */
 651         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 652                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 653                         FILE_ATTRIBUTE_NORMAL, NULL);
 654         if (cons == INVALID_HANDLE_VALUE) {
 655                 /* There is no console associated with this process.
 656                  * Since the child is a console process, Windows
 657                  * would normally create a console window. But
 658                  * since we'll be redirecting std streams, we do
 659                  * not need the console.
 660                  * It is necessary to use DETACHED_PROCESS
 661                  * instead of CREATE_NO_WINDOW to make ssh
 662                  * recognize that it has no console.
 663                  */
 664                 flags = DETACHED_PROCESS;
 665         } else {
 666                 /* There is already a console. If we specified
 667                  * DETACHED_PROCESS here, too, Windows would
 668                  * disassociate the child from the console.
 669                  * The same is true for CREATE_NO_WINDOW.
 670                  * Go figure!
 671                  */
 672                 flags = 0;
 673                 CloseHandle(cons);
 674         }
 675         memset(&si, 0, sizeof(si));
 676         si.cb = sizeof(si);
 677         si.dwFlags = STARTF_USESTDHANDLES;
 678         si.hStdInput = (HANDLE) _get_osfhandle(0);
 679         si.hStdOutput = (HANDLE) _get_osfhandle(1);
 680         si.hStdError = (HANDLE) _get_osfhandle(2);
 681
 682         /* concatenate argv, quoting args as we go */
 683         strbuf_init(&args, 0);
 684         if (prepend_cmd) {
 685                 char *quoted = (char *)quote_arg(cmd);
 686                 strbuf_addstr(&args, quoted);
 687                 if (quoted != cmd)
 688                         free(quoted);
 689         }
 690         for (; *argv; argv++) {
 691                 char *quoted = (char *)quote_arg(*argv);
 692                 if (*args.buf)
 693                         strbuf_addch(&args, ' ');
 694                 strbuf_addstr(&args, quoted);
 695                 if (quoted != *argv)
 696                         free(quoted);
 697         }
 698
 699         if (env) {
 700                 int count = 0;
 701                 char **e, **sorted_env;
 702
 703                 for (e = env; *e; e++)
 704                         count++;
 705
 706                 /* environment must be sorted */
 707                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 708                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 709                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 710
 711                 strbuf_init(&envblk, 0);
 712                 for (e = sorted_env; *e; e++) {
 713                         strbuf_addstr(&envblk, *e);
 714                         strbuf_addch(&envblk, '\0');
 715                 }
 716                 free(sorted_env);
 717         }
 718
 719         memset(&pi, 0, sizeof(pi));
 720         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 721                 env ? envblk.buf : NULL, NULL, &si, &pi);
 722
 723         if (env)
 724                 strbuf_release(&envblk);
 725         strbuf_release(&args);
 726
 727         if (!ret) {
 728                 errno = ENOENT;
 729                 return -1;
 730         }
 731         CloseHandle(pi.hThread);
 732         return (pid_t)pi.hProcess;
 733 }
 734
 735 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 736 {
 737         pid_t pid;
 738         char **path = get_path_split();
 739         char *prog = path_lookup(cmd, path, 0);
 740
 741         if (!prog) {
 742                 errno = ENOENT;
 743                 pid = -1;
 744         }
 745         else {
 746                 const char *interpr = parse_interpreter(prog);
 747
 748                 if (interpr) {
 749                         const char *argv0 = argv[0];
 750                         char *iprog = path_lookup(interpr, path, 1);
 751                         argv[0] = prog;
 752                         if (!iprog) {
 753                                 errno = ENOENT;
 754                                 pid = -1;
 755                         }
 756                         else {
 757                                 pid = mingw_spawnve(iprog, argv, env, 1);
 758                                 free(iprog);
 759                         }
 760                         argv[0] = argv0;
 761                 }
 762                 else
 763                         pid = mingw_spawnve(prog, argv, env, 0);
 764                 free(prog);
 765         }
 766         free_path_split(path);
 767         return pid;
 768 }
 769
 770 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 771 {
 772         const char *interpr = parse_interpreter(cmd);
 773         char **path;
 774         char *prog;
 775         int pid = 0;
 776
 777         if (!interpr)
 778                 return 0;
 779         path = get_path_split();
 780         prog = path_lookup(interpr, path, 1);
 781         if (prog) {
 782                 int argc = 0;
 783                 const char **argv2;
 784                 while (argv[argc]) argc++;
 785                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 786                 argv2[0] = (char *)cmd; /* full path to the script file */
 787                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 788                 pid = mingw_spawnve(prog, argv2, env, 1);
 789                 if (pid >= 0) {
 790                         int status;
 791                         if (waitpid(pid, &status, 0) < 0)
 792                                 status = 255;
 793                         exit(status);
 794                 }
 795                 pid = 1;        /* indicate that we tried but failed */
 796                 free(prog);
 797                 free(argv2);
 798         }
 799         free_path_split(path);
 800         return pid;
 801 }
 802
 803 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 804 {
 805         /* check if git_command is a shell script */
 806         if (!try_shell_exec(cmd, argv, (char **)env)) {
 807                 int pid, status;
 808
 809                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 810                 if (pid < 0)
 811                         return;
 812                 if (waitpid(pid, &status, 0) < 0)
 813                         status = 255;
 814                 exit(status);
 815         }
 816 }
 817
 818 void mingw_execvp(const char *cmd, char *const *argv)
 819 {
 820         char **path = get_path_split();
 821         char *prog = path_lookup(cmd, path, 0);
 822
 823         if (prog) {
 824                 mingw_execve(prog, argv, environ);
 825                 free(prog);
 826         } else
 827                 errno = ENOENT;
 828
 829         free_path_split(path);
 830 }
 831
 832 static char **copy_environ(void)
 833 {
 834         char **env;
 835         int i = 0;
 836         while (environ[i])
 837                 i++;
 838         env = xmalloc((i+1)*sizeof(*env));
 839         for (i = 0; environ[i]; i++)
 840                 env[i] = xstrdup(environ[i]);
 841         env[i] = NULL;
 842         return env;
 843 }
 844
 845 void free_environ(char **env)
 846 {
 847         int i;
 848         for (i = 0; env[i]; i++)
 849                 free(env[i]);
 850         free(env);
 851 }
 852
 853 static int lookup_env(char **env, const char *name, size_t nmln)
 854 {
 855         int i;
 856
 857         for (i = 0; env[i]; i++) {
 858                 if (0 == strncmp(env[i], name, nmln)
 859                     && '=' == env[i][nmln])
 860                         /* matches */
 861                         return i;
 862         }
 863         return -1;
 864 }
 865
 866 /*
 867  * If name contains '=', then sets the variable, otherwise it unsets it
 868  */
 869 static char **env_setenv(char **env, const char *name)
 870 {
 871         char *eq = strchrnul(name, '=');
 872         int i = lookup_env(env, name, eq-name);
 873
 874         if (i < 0) {
 875                 if (*eq) {
 876                         for (i = 0; env[i]; i++)
 877                                 ;
 878                         env = xrealloc(env, (i+2)*sizeof(*env));
 879                         env[i] = xstrdup(name);
 880                         env[i+1] = NULL;
 881                 }
 882         }
 883         else {
 884                 free(env[i]);
 885                 if (*eq)
 886                         env[i] = xstrdup(name);
 887                 else
 888                         for (; env[i]; i++)
 889                                 env[i] = env[i+1];
 890         }
 891         return env;
 892 }
 893
 894 /*
 895  * Copies global environ and adjusts variables as specified by vars.
 896  */
 897 char **make_augmented_environ(const char *const *vars)
 898 {
 899         char **env = copy_environ();
 900
 901         while (*vars)
 902                 env = env_setenv(env, *vars++);
 903         return env;
 904 }
 905
 906 /* this is the first function to call into WS_32; initialize it */
 907 #undef gethostbyname
 908 struct hostent *mingw_gethostbyname(const char *host)
 909 {
 910         WSADATA wsa;
 911
 912         if (WSAStartup(MAKEWORD(2,2), &wsa))
 913                 die("unable to initialize winsock subsystem, error %d",
 914                         WSAGetLastError());
 915         atexit((void(*)(void)) WSACleanup);
 916         return gethostbyname(host);
 917 }
 918
 919 int mingw_socket(int domain, int type, int protocol)
 920 {
 921         int sockfd;
 922         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
 923         if (s == INVALID_SOCKET) {
 924                 /*
 925                  * WSAGetLastError() values are regular BSD error codes
 926                  * biased by WSABASEERR.
 927                  * However, strerror() does not know about networking
 928                  * specific errors, which are values beginning at 38 or so.
 929                  * Therefore, we choose to leave the biased error code
 930                  * in errno so that _if_ someone looks up the code somewhere,
 931                  * then it is at least the number that are usually listed.
 932                  */
 933                 errno = WSAGetLastError();
 934                 return -1;
 935         }
 936         /* convert into a file descriptor */
 937         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
 938                 closesocket(s);
 939                 return error("unable to make a socket file descriptor: %s",
 940                         strerror(errno));
 941         }
 942         return sockfd;
 943 }
 944
 945 #undef connect
 946 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
 947 {
 948         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
 949         return connect(s, sa, sz);
 950 }
 951
 952 #undef rename
 953 int mingw_rename(const char *pold, const char *pnew)
 954 {
 955         DWORD attrs, gle;
 956         int tries = 0;
 957         static const int delay[] = { 0, 1, 10, 20, 40 };
 958
 959         /*
 960          * Try native rename() first to get errno right.
 961          * It is based on MoveFile(), which cannot overwrite existing files.
 962          */
 963         if (!rename(pold, pnew))
 964                 return 0;
 965         if (errno != EEXIST)
 966                 return -1;
 967 repeat:
 968         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 969                 return 0;
 970         /* TODO: translate more errors */
 971         gle = GetLastError();
 972         if (gle == ERROR_ACCESS_DENIED &&
 973             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
 974                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
 975                         errno = EISDIR;
 976                         return -1;
 977                 }
 978                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
 979                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
 980                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 981                                 return 0;
 982                         gle = GetLastError();
 983                         /* revert file attributes on failure */
 984                         SetFileAttributes(pnew, attrs);
 985                 }
 986         }
 987         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
 988                 /*
 989                  * We assume that some other process had the source or
 990                  * destination file open at the wrong moment and retry.
 991                  * In order to give the other process a higher chance to
 992                  * complete its operation, we give up our time slice now.
 993                  * If we have to retry again, we do sleep a bit.
 994                  */
 995                 Sleep(delay[tries]);
 996                 tries++;
 997                 goto repeat;
 998         }
 999         errno = EACCES;
1000         return -1;
1001 }
1002
1003 /*
1004  * Note that this doesn't return the actual pagesize, but
1005  * the allocation granularity. If future Windows specific git code
1006  * needs the real getpagesize function, we need to find another solution.
1007  */
1008 int mingw_getpagesize(void)
1009 {
1010         SYSTEM_INFO si;
1011         GetSystemInfo(&si);
1012         return si.dwAllocationGranularity;
1013 }
1014
1015 struct passwd *getpwuid(int uid)
1016 {
1017         static char user_name[100];
1018         static struct passwd p;
1019
1020         DWORD len = sizeof(user_name);
1021         if (!GetUserName(user_name, &len))
1022                 return NULL;
1023         p.pw_name = user_name;
1024         p.pw_gecos = "unknown";
1025         p.pw_dir = NULL;
1026         return &p;
1027 }
1028
1029 static HANDLE timer_event;
1030 static HANDLE timer_thread;
1031 static int timer_interval;
1032 static int one_shot;
1033 static sig_handler_t timer_fn = SIG_DFL;
1034
1035 /* The timer works like this:
1036  * The thread, ticktack(), is a trivial routine that most of the time
1037  * only waits to receive the signal to terminate. The main thread tells
1038  * the thread to terminate by setting the timer_event to the signalled
1039  * state.
1040  * But ticktack() interrupts the wait state after the timer's interval
1041  * length to call the signal handler.
1042  */
1043
1044 static unsigned __stdcall ticktack(void *dummy)
1045 {
1046         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1047                 if (timer_fn == SIG_DFL)
1048                         die("Alarm");
1049                 if (timer_fn != SIG_IGN)
1050                         timer_fn(SIGALRM);
1051                 if (one_shot)
1052                         break;
1053         }
1054         return 0;
1055 }
1056
1057 static int start_timer_thread(void)
1058 {
1059         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1060         if (timer_event) {
1061                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1062                 if (!timer_thread )
1063                         return errno = ENOMEM,
1064                                 error("cannot start timer thread");
1065         } else
1066                 return errno = ENOMEM,
1067                         error("cannot allocate resources for timer");
1068         return 0;
1069 }
1070
1071 static void stop_timer_thread(void)
1072 {
1073         if (timer_event)
1074                 SetEvent(timer_event);  /* tell thread to terminate */
1075         if (timer_thread) {
1076                 int rc = WaitForSingleObject(timer_thread, 1000);
1077                 if (rc == WAIT_TIMEOUT)
1078                         error("timer thread did not terminate timely");
1079                 else if (rc != WAIT_OBJECT_0)
1080                         error("waiting for timer thread failed: %lu",
1081                               GetLastError());
1082                 CloseHandle(timer_thread);
1083         }
1084         if (timer_event)
1085                 CloseHandle(timer_event);
1086         timer_event = NULL;
1087         timer_thread = NULL;
1088 }
1089
1090 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1091 {
1092         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1093 }
1094
1095 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1096 {
1097         static const struct timeval zero;
1098         static int atexit_done;
1099
1100         if (out != NULL)
1101                 return errno = EINVAL,
1102                         error("setitimer param 3 != NULL not implemented");
1103         if (!is_timeval_eq(&in->it_interval, &zero) &&
1104             !is_timeval_eq(&in->it_interval, &in->it_value))
1105                 return errno = EINVAL,
1106                         error("setitimer: it_interval must be zero or eq it_value");
1107
1108         if (timer_thread)
1109                 stop_timer_thread();
1110
1111         if (is_timeval_eq(&in->it_value, &zero) &&
1112             is_timeval_eq(&in->it_interval, &zero))
1113                 return 0;
1114
1115         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1116         one_shot = is_timeval_eq(&in->it_interval, &zero);
1117         if (!atexit_done) {
1118                 atexit(stop_timer_thread);
1119                 atexit_done = 1;
1120         }
1121         return start_timer_thread();
1122 }
1123
1124 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1125 {
1126         if (sig != SIGALRM)
1127                 return errno = EINVAL,
1128                         error("sigaction only implemented for SIGALRM");
1129         if (out != NULL)
1130                 return errno = EINVAL,
1131                         error("sigaction: param 3 != NULL not implemented");
1132
1133         timer_fn = in->sa_handler;
1134         return 0;
1135 }
1136
1137 #undef signal
1138 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1139 {
1140         sig_handler_t old = timer_fn;
1141         if (sig != SIGALRM)
1142                 return signal(sig, handler);
1143         timer_fn = handler;
1144         return old;
1145 }
1146
1147 static const char *make_backslash_path(const char *path)
1148 {
1149         static char buf[PATH_MAX + 1];
1150         char *c;
1151
1152         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1153                 die("Too long path: %.*s", 60, path);
1154
1155         for (c = buf; *c; c++) {
1156                 if (*c == '/')
1157                         *c = '\\';
1158         }
1159         return buf;
1160 }
1161
1162 void mingw_open_html(const char *unixpath)
1163 {
1164         const char *htmlpath = make_backslash_path(unixpath);
1165         printf("Launching default browser to display HTML ...\n");
1166         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1167 }
1168
1169 int link(const char *oldpath, const char *newpath)
1170 {
1171         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1172         static T create_hard_link = NULL;
1173         if (!create_hard_link) {
1174                 create_hard_link = (T) GetProcAddress(
1175                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1176                 if (!create_hard_link)
1177                         create_hard_link = (T)-1;
1178         }
1179         if (create_hard_link == (T)-1) {
1180                 errno = ENOSYS;
1181                 return -1;
1182         }
1183         if (!create_hard_link(newpath, oldpath, NULL)) {
1184                 errno = err_win_to_posix(GetLastError());
1185                 return -1;
1186         }
1187         return 0;
1188 }
1189
1190 char *getpass(const char *prompt)
1191 {
1192         struct strbuf buf = STRBUF_INIT;
1193
1194         fputs(prompt, stderr);
1195         for (;;) {
1196                 char c = _getch();
1197                 if (c == '\r' || c == '\n')
1198                         break;
1199                 strbuf_addch(&buf, c);
1200         }
1201         fputs("\n", stderr);
1202         return strbuf_detach(&buf, NULL);
1203 }
1204
1205 #ifndef NO_MINGW_REPLACE_READDIR
1206 /* MinGW readdir implementation to avoid extra lstats for Git */
1207 struct mingw_DIR
1208 {
1209         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1210         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1211         long                    dd_handle;      /* _findnext handle */
1212         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1213         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1214 };
1215
1216 struct dirent *mingw_readdir(DIR *dir)
1217 {
1218         WIN32_FIND_DATAA buf;
1219         HANDLE handle;
1220         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1221
1222         if (!dir->dd_handle) {
1223                 errno = EBADF; /* No set_errno for mingw */
1224                 return NULL;
1225         }
1226
1227         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1228         {
1229                 DWORD lasterr;
1230                 handle = FindFirstFileA(dir->dd_name, &buf);
1231                 lasterr = GetLastError();
1232                 dir->dd_handle = (long)handle;
1233                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1234                         errno = err_win_to_posix(lasterr);
1235                         return NULL;
1236                 }
1237         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1238                 return NULL;
1239         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1240                 DWORD lasterr = GetLastError();
1241                 FindClose((HANDLE)dir->dd_handle);
1242                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1243                 /* POSIX says you shouldn't set errno when readdir can't
1244                    find any more files; so, if another error we leave it set. */
1245                 if (lasterr != ERROR_NO_MORE_FILES)
1246                         errno = err_win_to_posix(lasterr);
1247                 return NULL;
1248         }
1249
1250         /* We get here if `buf' contains valid data.  */
1251         strcpy(dir->dd_dir.d_name, buf.cFileName);
1252         ++dir->dd_stat;
1253
1254         /* Set file type, based on WIN32_FIND_DATA */
1255         mdir->dd_dir.d_type = 0;
1256         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1257                 mdir->dd_dir.d_type |= DT_DIR;
1258         else
1259                 mdir->dd_dir.d_type |= DT_REG;
1260
1261         return (struct dirent*)&dir->dd_dir;
1262 }
1263 #endif // !NO_MINGW_REPLACE_READDIR