compat/mingw.c

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