compat/mingw.c

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