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 /*
 741  * Compare environment entries by key (i.e. stopping at '=' or '\0').
 742  */
 743 static int compareenv(const void *v1, const void *v2)
 744 {
 745         const char *e1 = *(const char**)v1;
 746         const char *e2 = *(const char**)v2;
 747
 748         for (;;) {
 749                 int c1 = *e1++;
 750                 int c2 = *e2++;
 751                 c1 = (c1 == '=') ? 0 : tolower(c1);
 752                 c2 = (c2 == '=') ? 0 : tolower(c2);
 753                 if (c1 > c2)
 754                         return 1;
 755                 if (c1 < c2)
 756                         return -1;
 757                 if (c1 == 0)
 758                         return 0;
 759         }
 760 }
 761
 762 static int bsearchenv(char **env, const char *name, size_t size)
 763 {
 764         unsigned low = 0, high = size;
 765         while (low < high) {
 766                 unsigned mid = low + ((high - low) >> 1);
 767                 int cmp = compareenv(&env[mid], &name);
 768                 if (cmp < 0)
 769                         low = mid + 1;
 770                 else if (cmp > 0)
 771                         high = mid;
 772                 else
 773                         return mid;
 774         }
 775         return ~low; /* not found, return 1's complement of insert position */
 776 }
 777
 778 /*
 779  * If name contains '=', then sets the variable, otherwise it unsets it
 780  * Size includes the terminating NULL. Env must have room for size + 1 entries
 781  * (in case of insert). Returns the new size. Optionally frees removed entries.
 782  */
 783 static int do_putenv(char **env, const char *name, int size, int free_old)
 784 {
 785         int i = bsearchenv(env, name, size - 1);
 786
 787         /* optionally free removed / replaced entry */
 788         if (i >= 0 && free_old)
 789                 free(env[i]);
 790
 791         if (strchr(name, '=')) {
 792                 /* if new value ('key=value') is specified, insert or replace entry */
 793                 if (i < 0) {
 794                         i = ~i;
 795                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
 796                         size++;
 797                 }
 798                 env[i] = (char*) name;
 799         } else if (i >= 0) {
 800                 /* otherwise ('key') remove existing entry */
 801                 size--;
 802                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
 803         }
 804         return size;
 805 }
 806
 807 /* used number of elements of environ array, including terminating NULL */
 808 static int environ_size = 0;
 809 /* allocated size of environ array, in bytes */
 810 static int environ_alloc = 0;
 811
 812 static char *do_getenv(const char *name)
 813 {
 814         char *value;
 815         int pos = bsearchenv(environ, name, environ_size - 1);
 816         if (pos < 0)
 817                 return NULL;
 818         value = strchr(environ[pos], '=');
 819         return value ? &value[1] : NULL;
 820 }
 821
 822 char *mingw_getenv(const char *name)
 823 {
 824         char *result = do_getenv(name);
 825         if (!result && !strcmp(name, "TMPDIR")) {
 826                 /* on Windows it is TMP and TEMP */
 827                 result = do_getenv("TMP");
 828                 if (!result)
 829                         result = do_getenv("TEMP");
 830         }
 831         else if (!result && !strcmp(name, "TERM")) {
 832                 /* simulate TERM to enable auto-color (see color.c) */
 833                 result = "winansi";
 834         }
 835         return result;
 836 }
 837
 838 int mingw_putenv(const char *namevalue)
 839 {
 840         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
 841         environ_size = do_putenv(environ, namevalue, environ_size, 1);
 842         return 0;
 843 }
 844
 845 /*
 846  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 847  * (Parsing C++ Command-Line Arguments)
 848  */
 849 static const char *quote_arg(const char *arg)
 850 {
 851         /* count chars to quote */
 852         int len = 0, n = 0;
 853         int force_quotes = 0;
 854         char *q, *d;
 855         const char *p = arg;
 856         if (!*p) force_quotes = 1;
 857         while (*p) {
 858                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 859                         force_quotes = 1;
 860                 else if (*p == '"')
 861                         n++;
 862                 else if (*p == '\\') {
 863                         int count = 0;
 864                         while (*p == '\\') {
 865                                 count++;
 866                                 p++;
 867                                 len++;
 868                         }
 869                         if (*p == '"')
 870                                 n += count*2 + 1;
 871                         continue;
 872                 }
 873                 len++;
 874                 p++;
 875         }
 876         if (!force_quotes && n == 0)
 877                 return arg;
 878
 879         /* insert \ where necessary */
 880         d = q = xmalloc(len+n+3);
 881         *d++ = '"';
 882         while (*arg) {
 883                 if (*arg == '"')
 884                         *d++ = '\\';
 885                 else if (*arg == '\\') {
 886                         int count = 0;
 887                         while (*arg == '\\') {
 888                                 count++;
 889                                 *d++ = *arg++;
 890                         }
 891                         if (*arg == '"') {
 892                                 while (count-- > 0)
 893                                         *d++ = '\\';
 894                                 *d++ = '\\';
 895                         }
 896                 }
 897                 *d++ = *arg++;
 898         }
 899         *d++ = '"';
 900         *d++ = 0;
 901         return q;
 902 }
 903
 904 static const char *parse_interpreter(const char *cmd)
 905 {
 906         static char buf[100];
 907         char *p, *opt;
 908         int n, fd;
 909
 910         /* don't even try a .exe */
 911         n = strlen(cmd);
 912         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 913                 return NULL;
 914
 915         fd = open(cmd, O_RDONLY);
 916         if (fd < 0)
 917                 return NULL;
 918         n = read(fd, buf, sizeof(buf)-1);
 919         close(fd);
 920         if (n < 4)      /* at least '#!/x' and not error */
 921                 return NULL;
 922
 923         if (buf[0] != '#' || buf[1] != '!')
 924                 return NULL;
 925         buf[n] = '\0';
 926         p = buf + strcspn(buf, "\r\n");
 927         if (!*p)
 928                 return NULL;
 929
 930         *p = '\0';
 931         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 932                 return NULL;
 933         /* strip options */
 934         if ((opt = strchr(p+1, ' ')))
 935                 *opt = '\0';
 936         return p+1;
 937 }
 938
 939 /*
 940  * Splits the PATH into parts.
 941  */
 942 static char **get_path_split(void)
 943 {
 944         char *p, **path, *envpath = getenv("PATH");
 945         int i, n = 0;
 946
 947         if (!envpath || !*envpath)
 948                 return NULL;
 949
 950         envpath = xstrdup(envpath);
 951         p = envpath;
 952         while (p) {
 953                 char *dir = p;
 954                 p = strchr(p, ';');
 955                 if (p) *p++ = '\0';
 956                 if (*dir) {     /* not earlier, catches series of ; */
 957                         ++n;
 958                 }
 959         }
 960         if (!n)
 961                 return NULL;
 962
 963         path = xmalloc((n+1)*sizeof(char *));
 964         p = envpath;
 965         i = 0;
 966         do {
 967                 if (*p)
 968                         path[i++] = xstrdup(p);
 969                 p = p+strlen(p)+1;
 970         } while (i < n);
 971         path[i] = NULL;
 972
 973         free(envpath);
 974
 975         return path;
 976 }
 977
 978 static void free_path_split(char **path)
 979 {
 980         char **p = path;
 981
 982         if (!path)
 983                 return;
 984
 985         while (*p)
 986                 free(*p++);
 987         free(path);
 988 }
 989
 990 /*
 991  * exe_only means that we only want to detect .exe files, but not scripts
 992  * (which do not have an extension)
 993  */
 994 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 995 {
 996         char path[MAX_PATH];
 997         wchar_t wpath[MAX_PATH];
 998         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 999
1000         if (xutftowcs_path(wpath, path) < 0)
1001                 return NULL;
1002
1003         if (!isexe && _waccess(wpath, F_OK) == 0)
1004                 return xstrdup(path);
1005         path[strlen(path)-4] = '\0';
1006         if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
1007
1008                 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY))
1009                         return xstrdup(path);
1010         }
1011         return NULL;
1012 }
1013
1014 /*
1015  * Determines the absolute path of cmd using the split path in path.
1016  * If cmd contains a slash or backslash, no lookup is performed.
1017  */
1018 static char *path_lookup(const char *cmd, char **path, int exe_only)
1019 {
1020         char *prog = NULL;
1021         int len = strlen(cmd);
1022         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1023
1024         if (strchr(cmd, '/') || strchr(cmd, '\\'))
1025                 prog = xstrdup(cmd);
1026
1027         while (!prog && *path)
1028                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
1029
1030         return prog;
1031 }
1032
1033 /*
1034  * Create environment block suitable for CreateProcess. Merges current
1035  * process environment and the supplied environment changes.
1036  */
1037 static wchar_t *make_environment_block(char **deltaenv)
1038 {
1039         wchar_t *wenvblk = NULL;
1040         char **tmpenv;
1041         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1042
1043         while (deltaenv && deltaenv[i])
1044                 i++;
1045
1046         /* copy the environment, leaving space for changes */
1047         tmpenv = xmalloc((size + i) * sizeof(char*));
1048         memcpy(tmpenv, environ, size * sizeof(char*));
1049
1050         /* merge supplied environment changes into the temporary environment */
1051         for (i = 0; deltaenv && deltaenv[i]; i++)
1052                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1053
1054         /* create environment block from temporary environment */
1055         for (i = 0; tmpenv[i]; i++) {
1056                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1057                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1058                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1059         }
1060         /* add final \0 terminator */
1061         wenvblk[wenvpos] = 0;
1062         free(tmpenv);
1063         return wenvblk;
1064 }
1065
1066 struct pinfo_t {
1067         struct pinfo_t *next;
1068         pid_t pid;
1069         HANDLE proc;
1070 } pinfo_t;
1071 struct pinfo_t *pinfo = NULL;
1072 CRITICAL_SECTION pinfo_cs;
1073
1074 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1075                               const char *dir,
1076                               int prepend_cmd, int fhin, int fhout, int fherr)
1077 {
1078         STARTUPINFOW si;
1079         PROCESS_INFORMATION pi;
1080         struct strbuf args;
1081         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1082         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1083         BOOL ret;
1084
1085         /* Determine whether or not we are associated to a console */
1086         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1087                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1088                         FILE_ATTRIBUTE_NORMAL, NULL);
1089         if (cons == INVALID_HANDLE_VALUE) {
1090                 /* There is no console associated with this process.
1091                  * Since the child is a console process, Windows
1092                  * would normally create a console window. But
1093                  * since we'll be redirecting std streams, we do
1094                  * not need the console.
1095                  * It is necessary to use DETACHED_PROCESS
1096                  * instead of CREATE_NO_WINDOW to make ssh
1097                  * recognize that it has no console.
1098                  */
1099                 flags |= DETACHED_PROCESS;
1100         } else {
1101                 /* There is already a console. If we specified
1102                  * DETACHED_PROCESS here, too, Windows would
1103                  * disassociate the child from the console.
1104                  * The same is true for CREATE_NO_WINDOW.
1105                  * Go figure!
1106                  */
1107                 CloseHandle(cons);
1108         }
1109         memset(&si, 0, sizeof(si));
1110         si.cb = sizeof(si);
1111         si.dwFlags = STARTF_USESTDHANDLES;
1112         si.hStdInput = winansi_get_osfhandle(fhin);
1113         si.hStdOutput = winansi_get_osfhandle(fhout);
1114         si.hStdError = winansi_get_osfhandle(fherr);
1115
1116         if (xutftowcs_path(wcmd, cmd) < 0)
1117                 return -1;
1118         if (dir && xutftowcs_path(wdir, dir) < 0)
1119                 return -1;
1120
1121         /* concatenate argv, quoting args as we go */
1122         strbuf_init(&args, 0);
1123         if (prepend_cmd) {
1124                 char *quoted = (char *)quote_arg(cmd);
1125                 strbuf_addstr(&args, quoted);
1126                 if (quoted != cmd)
1127                         free(quoted);
1128         }
1129         for (; *argv; argv++) {
1130                 char *quoted = (char *)quote_arg(*argv);
1131                 if (*args.buf)
1132                         strbuf_addch(&args, ' ');
1133                 strbuf_addstr(&args, quoted);
1134                 if (quoted != *argv)
1135                         free(quoted);
1136         }
1137
1138         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1139         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1140         strbuf_release(&args);
1141
1142         wenvblk = make_environment_block(deltaenv);
1143
1144         memset(&pi, 0, sizeof(pi));
1145         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1146                 wenvblk, dir ? wdir : NULL, &si, &pi);
1147
1148         free(wenvblk);
1149         free(wargs);
1150
1151         if (!ret) {
1152                 errno = ENOENT;
1153                 return -1;
1154         }
1155         CloseHandle(pi.hThread);
1156
1157         /*
1158          * The process ID is the human-readable identifier of the process
1159          * that we want to present in log and error messages. The handle
1160          * is not useful for this purpose. But we cannot close it, either,
1161          * because it is not possible to turn a process ID into a process
1162          * handle after the process terminated.
1163          * Keep the handle in a list for waitpid.
1164          */
1165         EnterCriticalSection(&pinfo_cs);
1166         {
1167                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1168                 info->pid = pi.dwProcessId;
1169                 info->proc = pi.hProcess;
1170                 info->next = pinfo;
1171                 pinfo = info;
1172         }
1173         LeaveCriticalSection(&pinfo_cs);
1174
1175         return (pid_t)pi.dwProcessId;
1176 }
1177
1178 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1179 {
1180         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1181 }
1182
1183 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1184                      const char *dir,
1185                      int fhin, int fhout, int fherr)
1186 {
1187         pid_t pid;
1188         char **path = get_path_split();
1189         char *prog = path_lookup(cmd, path, 0);
1190
1191         if (!prog) {
1192                 errno = ENOENT;
1193                 pid = -1;
1194         }
1195         else {
1196                 const char *interpr = parse_interpreter(prog);
1197
1198                 if (interpr) {
1199                         const char *argv0 = argv[0];
1200                         char *iprog = path_lookup(interpr, path, 1);
1201                         argv[0] = prog;
1202                         if (!iprog) {
1203                                 errno = ENOENT;
1204                                 pid = -1;
1205                         }
1206                         else {
1207                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1208                                                        fhin, fhout, fherr);
1209                                 free(iprog);
1210                         }
1211                         argv[0] = argv0;
1212                 }
1213                 else
1214                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1215                                                fhin, fhout, fherr);
1216                 free(prog);
1217         }
1218         free_path_split(path);
1219         return pid;
1220 }
1221
1222 static int try_shell_exec(const char *cmd, char *const *argv)
1223 {
1224         const char *interpr = parse_interpreter(cmd);
1225         char **path;
1226         char *prog;
1227         int pid = 0;
1228
1229         if (!interpr)
1230                 return 0;
1231         path = get_path_split();
1232         prog = path_lookup(interpr, path, 1);
1233         if (prog) {
1234                 int argc = 0;
1235                 const char **argv2;
1236                 while (argv[argc]) argc++;
1237                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1238                 argv2[0] = (char *)cmd; /* full path to the script file */
1239                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1240                 pid = mingw_spawnv(prog, argv2, 1);
1241                 if (pid >= 0) {
1242                         int status;
1243                         if (waitpid(pid, &status, 0) < 0)
1244                                 status = 255;
1245                         exit(status);
1246                 }
1247                 pid = 1;        /* indicate that we tried but failed */
1248                 free(prog);
1249                 free(argv2);
1250         }
1251         free_path_split(path);
1252         return pid;
1253 }
1254
1255 int mingw_execv(const char *cmd, char *const *argv)
1256 {
1257         /* check if git_command is a shell script */
1258         if (!try_shell_exec(cmd, argv)) {
1259                 int pid, status;
1260
1261                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1262                 if (pid < 0)
1263                         return -1;
1264                 if (waitpid(pid, &status, 0) < 0)
1265                         status = 255;
1266                 exit(status);
1267         }
1268         return -1;
1269 }
1270
1271 int mingw_execvp(const char *cmd, char *const *argv)
1272 {
1273         char **path = get_path_split();
1274         char *prog = path_lookup(cmd, path, 0);
1275
1276         if (prog) {
1277                 mingw_execv(prog, argv);
1278                 free(prog);
1279         } else
1280                 errno = ENOENT;
1281
1282         free_path_split(path);
1283         return -1;
1284 }
1285
1286 int mingw_kill(pid_t pid, int sig)
1287 {
1288         if (pid > 0 && sig == SIGTERM) {
1289                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1290
1291                 if (TerminateProcess(h, -1)) {
1292                         CloseHandle(h);
1293                         return 0;
1294                 }
1295
1296                 errno = err_win_to_posix(GetLastError());
1297                 CloseHandle(h);
1298                 return -1;
1299         }
1300
1301         errno = EINVAL;
1302         return -1;
1303 }
1304
1305 /*
1306  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1307  * that service contains a numerical port, or that it is null. It
1308  * does a simple search using gethostbyname, and returns one IPv4 host
1309  * if one was found.
1310  */
1311 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1312                                    const struct addrinfo *hints,
1313                                    struct addrinfo **res)
1314 {
1315         struct hostent *h = NULL;
1316         struct addrinfo *ai;
1317         struct sockaddr_in *sin;
1318
1319         if (node) {
1320                 h = gethostbyname(node);
1321                 if (!h)
1322                         return WSAGetLastError();
1323         }
1324
1325         ai = xmalloc(sizeof(struct addrinfo));
1326         *res = ai;
1327         ai->ai_flags = 0;
1328         ai->ai_family = AF_INET;
1329         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1330         switch (ai->ai_socktype) {
1331         case SOCK_STREAM:
1332                 ai->ai_protocol = IPPROTO_TCP;
1333                 break;
1334         case SOCK_DGRAM:
1335                 ai->ai_protocol = IPPROTO_UDP;
1336                 break;
1337         default:
1338                 ai->ai_protocol = 0;
1339                 break;
1340         }
1341         ai->ai_addrlen = sizeof(struct sockaddr_in);
1342         if (hints && (hints->ai_flags & AI_CANONNAME))
1343                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1344         else
1345                 ai->ai_canonname = NULL;
1346
1347         sin = xmalloc(ai->ai_addrlen);
1348         memset(sin, 0, ai->ai_addrlen);
1349         sin->sin_family = AF_INET;
1350         /* Note: getaddrinfo is supposed to allow service to be a string,
1351          * which should be looked up using getservbyname. This is
1352          * currently not implemented */
1353         if (service)
1354                 sin->sin_port = htons(atoi(service));
1355         if (h)
1356                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1357         else if (hints && (hints->ai_flags & AI_PASSIVE))
1358                 sin->sin_addr.s_addr = INADDR_ANY;
1359         else
1360                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1361         ai->ai_addr = (struct sockaddr *)sin;
1362         ai->ai_next = 0;
1363         return 0;
1364 }
1365
1366 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1367 {
1368         free(res->ai_canonname);
1369         free(res->ai_addr);
1370         free(res);
1371 }
1372
1373 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1374                                    char *host, DWORD hostlen,
1375                                    char *serv, DWORD servlen, int flags)
1376 {
1377         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1378         if (sa->sa_family != AF_INET)
1379                 return EAI_FAMILY;
1380         if (!host && !serv)
1381                 return EAI_NONAME;
1382
1383         if (host && hostlen > 0) {
1384                 struct hostent *ent = NULL;
1385                 if (!(flags & NI_NUMERICHOST))
1386                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1387                                             sizeof(sin->sin_addr), AF_INET);
1388
1389                 if (ent)
1390                         snprintf(host, hostlen, "%s", ent->h_name);
1391                 else if (flags & NI_NAMEREQD)
1392                         return EAI_NONAME;
1393                 else
1394                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1395         }
1396
1397         if (serv && servlen > 0) {
1398                 struct servent *ent = NULL;
1399                 if (!(flags & NI_NUMERICSERV))
1400                         ent = getservbyport(sin->sin_port,
1401                                             flags & NI_DGRAM ? "udp" : "tcp");
1402
1403                 if (ent)
1404                         snprintf(serv, servlen, "%s", ent->s_name);
1405                 else
1406                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1407         }
1408
1409         return 0;
1410 }
1411
1412 static HMODULE ipv6_dll = NULL;
1413 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1414 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1415                                       const struct addrinfo *hints,
1416                                       struct addrinfo **res);
1417 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1418                                       char *host, DWORD hostlen,
1419                                       char *serv, DWORD servlen, int flags);
1420 /*
1421  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1422  * don't need to try to load that one dynamically.
1423  */
1424
1425 static void socket_cleanup(void)
1426 {
1427         WSACleanup();
1428         if (ipv6_dll)
1429                 FreeLibrary(ipv6_dll);
1430         ipv6_dll = NULL;
1431         ipv6_freeaddrinfo = freeaddrinfo_stub;
1432         ipv6_getaddrinfo = getaddrinfo_stub;
1433         ipv6_getnameinfo = getnameinfo_stub;
1434 }
1435
1436 static void ensure_socket_initialization(void)
1437 {
1438         WSADATA wsa;
1439         static int initialized = 0;
1440         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1441         const char **name;
1442
1443         if (initialized)
1444                 return;
1445
1446         if (WSAStartup(MAKEWORD(2,2), &wsa))
1447                 die("unable to initialize winsock subsystem, error %d",
1448                         WSAGetLastError());
1449
1450         for (name = libraries; *name; name++) {
1451                 ipv6_dll = LoadLibrary(*name);
1452                 if (!ipv6_dll)
1453                         continue;
1454
1455                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1456                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1457                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1458                                                    const struct addrinfo *,
1459                                                    struct addrinfo **))
1460                         GetProcAddress(ipv6_dll, "getaddrinfo");
1461                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1462                                                    socklen_t, char *, DWORD,
1463                                                    char *, DWORD, int))
1464                         GetProcAddress(ipv6_dll, "getnameinfo");
1465                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1466                         FreeLibrary(ipv6_dll);
1467                         ipv6_dll = NULL;
1468                 } else
1469                         break;
1470         }
1471         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1472                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1473                 ipv6_getaddrinfo = getaddrinfo_stub;
1474                 ipv6_getnameinfo = getnameinfo_stub;
1475         }
1476
1477         atexit(socket_cleanup);
1478         initialized = 1;
1479 }
1480
1481 #undef gethostname
1482 int mingw_gethostname(char *name, int namelen)
1483 {
1484     ensure_socket_initialization();
1485     return gethostname(name, namelen);
1486 }
1487
1488 #undef gethostbyname
1489 struct hostent *mingw_gethostbyname(const char *host)
1490 {
1491         ensure_socket_initialization();
1492         return gethostbyname(host);
1493 }
1494
1495 void mingw_freeaddrinfo(struct addrinfo *res)
1496 {
1497         ipv6_freeaddrinfo(res);
1498 }
1499
1500 int mingw_getaddrinfo(const char *node, const char *service,
1501                       const struct addrinfo *hints, struct addrinfo **res)
1502 {
1503         ensure_socket_initialization();
1504         return ipv6_getaddrinfo(node, service, hints, res);
1505 }
1506
1507 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1508                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1509                       int flags)
1510 {
1511         ensure_socket_initialization();
1512         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1513 }
1514
1515 int mingw_socket(int domain, int type, int protocol)
1516 {
1517         int sockfd;
1518         SOCKET s;
1519
1520         ensure_socket_initialization();
1521         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1522         if (s == INVALID_SOCKET) {
1523                 /*
1524                  * WSAGetLastError() values are regular BSD error codes
1525                  * biased by WSABASEERR.
1526                  * However, strerror() does not know about networking
1527                  * specific errors, which are values beginning at 38 or so.
1528                  * Therefore, we choose to leave the biased error code
1529                  * in errno so that _if_ someone looks up the code somewhere,
1530                  * then it is at least the number that are usually listed.
1531                  */
1532                 errno = WSAGetLastError();
1533                 return -1;
1534         }
1535         /* convert into a file descriptor */
1536         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1537                 closesocket(s);
1538                 return error("unable to make a socket file descriptor: %s",
1539                         strerror(errno));
1540         }
1541         return sockfd;
1542 }
1543
1544 #undef connect
1545 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1546 {
1547         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1548         return connect(s, sa, sz);
1549 }
1550
1551 #undef bind
1552 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1553 {
1554         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1555         return bind(s, sa, sz);
1556 }
1557
1558 #undef setsockopt
1559 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1560 {
1561         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1562         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1563 }
1564
1565 #undef shutdown
1566 int mingw_shutdown(int sockfd, int how)
1567 {
1568         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1569         return shutdown(s, how);
1570 }
1571
1572 #undef listen
1573 int mingw_listen(int sockfd, int backlog)
1574 {
1575         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1576         return listen(s, backlog);
1577 }
1578
1579 #undef accept
1580 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1581 {
1582         int sockfd2;
1583
1584         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1585         SOCKET s2 = accept(s1, sa, sz);
1586
1587         /* convert into a file descriptor */
1588         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1589                 int err = errno;
1590                 closesocket(s2);
1591                 return error("unable to make a socket file descriptor: %s",
1592                         strerror(err));
1593         }
1594         return sockfd2;
1595 }
1596
1597 #undef rename
1598 int mingw_rename(const char *pold, const char *pnew)
1599 {
1600         DWORD attrs, gle;
1601         int tries = 0;
1602         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1603         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1604                 return -1;
1605
1606         /*
1607          * Try native rename() first to get errno right.
1608          * It is based on MoveFile(), which cannot overwrite existing files.
1609          */
1610         if (!_wrename(wpold, wpnew))
1611                 return 0;
1612         if (errno != EEXIST)
1613                 return -1;
1614 repeat:
1615         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1616                 return 0;
1617         /* TODO: translate more errors */
1618         gle = GetLastError();
1619         if (gle == ERROR_ACCESS_DENIED &&
1620             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1621                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1622                         errno = EISDIR;
1623                         return -1;
1624                 }
1625                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1626                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1627                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1628                                 return 0;
1629                         gle = GetLastError();
1630                         /* revert file attributes on failure */
1631                         SetFileAttributesW(wpnew, attrs);
1632                 }
1633         }
1634         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1635                 /*
1636                  * We assume that some other process had the source or
1637                  * destination file open at the wrong moment and retry.
1638                  * In order to give the other process a higher chance to
1639                  * complete its operation, we give up our time slice now.
1640                  * If we have to retry again, we do sleep a bit.
1641                  */
1642                 Sleep(delay[tries]);
1643                 tries++;
1644                 goto repeat;
1645         }
1646         if (gle == ERROR_ACCESS_DENIED &&
1647                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1648                        "Should I try again?", pold, pnew))
1649                 goto repeat;
1650
1651         errno = EACCES;
1652         return -1;
1653 }
1654
1655 /*
1656  * Note that this doesn't return the actual pagesize, but
1657  * the allocation granularity. If future Windows specific git code
1658  * needs the real getpagesize function, we need to find another solution.
1659  */
1660 int mingw_getpagesize(void)
1661 {
1662         SYSTEM_INFO si;
1663         GetSystemInfo(&si);
1664         return si.dwAllocationGranularity;
1665 }
1666
1667 struct passwd *getpwuid(int uid)
1668 {
1669         static char user_name[100];
1670         static struct passwd p;
1671
1672         DWORD len = sizeof(user_name);
1673         if (!GetUserName(user_name, &len))
1674                 return NULL;
1675         p.pw_name = user_name;
1676         p.pw_gecos = "unknown";
1677         p.pw_dir = NULL;
1678         return &p;
1679 }
1680
1681 static HANDLE timer_event;
1682 static HANDLE timer_thread;
1683 static int timer_interval;
1684 static int one_shot;
1685 static sig_handler_t timer_fn = SIG_DFL;
1686
1687 /* The timer works like this:
1688  * The thread, ticktack(), is a trivial routine that most of the time
1689  * only waits to receive the signal to terminate. The main thread tells
1690  * the thread to terminate by setting the timer_event to the signalled
1691  * state.
1692  * But ticktack() interrupts the wait state after the timer's interval
1693  * length to call the signal handler.
1694  */
1695
1696 static unsigned __stdcall ticktack(void *dummy)
1697 {
1698         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1699                 if (timer_fn == SIG_DFL)
1700                         die("Alarm");
1701                 if (timer_fn != SIG_IGN)
1702                         timer_fn(SIGALRM);
1703                 if (one_shot)
1704                         break;
1705         }
1706         return 0;
1707 }
1708
1709 static int start_timer_thread(void)
1710 {
1711         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1712         if (timer_event) {
1713                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1714                 if (!timer_thread )
1715                         return errno = ENOMEM,
1716                                 error("cannot start timer thread");
1717         } else
1718                 return errno = ENOMEM,
1719                         error("cannot allocate resources for timer");
1720         return 0;
1721 }
1722
1723 static void stop_timer_thread(void)
1724 {
1725         if (timer_event)
1726                 SetEvent(timer_event);  /* tell thread to terminate */
1727         if (timer_thread) {
1728                 int rc = WaitForSingleObject(timer_thread, 1000);
1729                 if (rc == WAIT_TIMEOUT)
1730                         error("timer thread did not terminate timely");
1731                 else if (rc != WAIT_OBJECT_0)
1732                         error("waiting for timer thread failed: %lu",
1733                               GetLastError());
1734                 CloseHandle(timer_thread);
1735         }
1736         if (timer_event)
1737                 CloseHandle(timer_event);
1738         timer_event = NULL;
1739         timer_thread = NULL;
1740 }
1741
1742 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1743 {
1744         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1745 }
1746
1747 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1748 {
1749         static const struct timeval zero;
1750         static int atexit_done;
1751
1752         if (out != NULL)
1753                 return errno = EINVAL,
1754                         error("setitimer param 3 != NULL not implemented");
1755         if (!is_timeval_eq(&in->it_interval, &zero) &&
1756             !is_timeval_eq(&in->it_interval, &in->it_value))
1757                 return errno = EINVAL,
1758                         error("setitimer: it_interval must be zero or eq it_value");
1759
1760         if (timer_thread)
1761                 stop_timer_thread();
1762
1763         if (is_timeval_eq(&in->it_value, &zero) &&
1764             is_timeval_eq(&in->it_interval, &zero))
1765                 return 0;
1766
1767         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1768         one_shot = is_timeval_eq(&in->it_interval, &zero);
1769         if (!atexit_done) {
1770                 atexit(stop_timer_thread);
1771                 atexit_done = 1;
1772         }
1773         return start_timer_thread();
1774 }
1775
1776 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1777 {
1778         if (sig != SIGALRM)
1779                 return errno = EINVAL,
1780                         error("sigaction only implemented for SIGALRM");
1781         if (out != NULL)
1782                 return errno = EINVAL,
1783                         error("sigaction: param 3 != NULL not implemented");
1784
1785         timer_fn = in->sa_handler;
1786         return 0;
1787 }
1788
1789 #undef signal
1790 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1791 {
1792         sig_handler_t old = timer_fn;
1793         if (sig != SIGALRM)
1794                 return signal(sig, handler);
1795         timer_fn = handler;
1796         return old;
1797 }
1798
1799 static const char *make_backslash_path(const char *path)
1800 {
1801         static char buf[PATH_MAX + 1];
1802         char *c;
1803
1804         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1805                 die("Too long path: %.*s", 60, path);
1806
1807         for (c = buf; *c; c++) {
1808                 if (*c == '/')
1809                         *c = '\\';
1810         }
1811         return buf;
1812 }
1813
1814 void mingw_open_html(const char *unixpath)
1815 {
1816         const char *htmlpath = make_backslash_path(unixpath);
1817         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1818                         const char *, const char *, const char *, INT);
1819         T ShellExecute;
1820         HMODULE shell32;
1821         int r;
1822
1823         shell32 = LoadLibrary("shell32.dll");
1824         if (!shell32)
1825                 die("cannot load shell32.dll");
1826         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1827         if (!ShellExecute)
1828                 die("cannot run browser");
1829
1830         printf("Launching default browser to display HTML ...\n");
1831         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1832         FreeLibrary(shell32);
1833         /* see the MSDN documentation referring to the result codes here */
1834         if (r <= 32) {
1835                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1836         }
1837 }
1838
1839 int link(const char *oldpath, const char *newpath)
1840 {
1841         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1842         static T create_hard_link = NULL;
1843         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1844         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1845                 xutftowcs_path(wnewpath, newpath) < 0)
1846                 return -1;
1847
1848         if (!create_hard_link) {
1849                 create_hard_link = (T) GetProcAddress(
1850                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1851                 if (!create_hard_link)
1852                         create_hard_link = (T)-1;
1853         }
1854         if (create_hard_link == (T)-1) {
1855                 errno = ENOSYS;
1856                 return -1;
1857         }
1858         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1859                 errno = err_win_to_posix(GetLastError());
1860                 return -1;
1861         }
1862         return 0;
1863 }
1864
1865 char *getpass(const char *prompt)
1866 {
1867         struct strbuf buf = STRBUF_INIT;
1868
1869         fputs(prompt, stderr);
1870         for (;;) {
1871                 char c = _getch();
1872                 if (c == '\r' || c == '\n')
1873                         break;
1874                 strbuf_addch(&buf, c);
1875         }
1876         fputs("\n", stderr);
1877         return strbuf_detach(&buf, NULL);
1878 }
1879
1880 pid_t waitpid(pid_t pid, int *status, int options)
1881 {
1882         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1883             FALSE, pid);
1884         if (!h) {
1885                 errno = ECHILD;
1886                 return -1;
1887         }
1888
1889         if (pid > 0 && options & WNOHANG) {
1890                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1891                         CloseHandle(h);
1892                         return 0;
1893                 }
1894                 options &= ~WNOHANG;
1895         }
1896
1897         if (options == 0) {
1898                 struct pinfo_t **ppinfo;
1899                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1900                         CloseHandle(h);
1901                         return 0;
1902                 }
1903
1904                 if (status)
1905                         GetExitCodeProcess(h, (LPDWORD)status);
1906
1907                 EnterCriticalSection(&pinfo_cs);
1908
1909                 ppinfo = &pinfo;
1910                 while (*ppinfo) {
1911                         struct pinfo_t *info = *ppinfo;
1912                         if (info->pid == pid) {
1913                                 CloseHandle(info->proc);
1914                                 *ppinfo = info->next;
1915                                 free(info);
1916                                 break;
1917                         }
1918                         ppinfo = &info->next;
1919                 }
1920
1921                 LeaveCriticalSection(&pinfo_cs);
1922
1923                 CloseHandle(h);
1924                 return pid;
1925         }
1926         CloseHandle(h);
1927
1928         errno = EINVAL;
1929         return -1;
1930 }
1931
1932 const char *get_windows_home_directory(void)
1933 {
1934         static const char *home_directory = NULL;
1935         struct strbuf buf = STRBUF_INIT;
1936
1937         if (home_directory)
1938                 return home_directory;
1939
1940         home_directory = getenv("HOME");
1941         if (home_directory && *home_directory)
1942                 return home_directory;
1943
1944         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1945         home_directory = strbuf_detach(&buf, NULL);
1946
1947         return home_directory;
1948 }
1949
1950 int mingw_offset_1st_component(const char *path)
1951 {
1952         int offset = 0;
1953         if (has_dos_drive_prefix(path))
1954                 offset = 2;
1955
1956         /* unc paths */
1957         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1958
1959                 /* skip server name */
1960                 char *pos = strpbrk(path + 2, "\\/");
1961                 if (!pos)
1962                         return 0; /* Error: malformed unc path */
1963
1964                 do {
1965                         pos++;
1966                 } while (*pos && !is_dir_sep(*pos));
1967
1968                 offset = pos - path;
1969         }
1970
1971         return offset + is_dir_sep(path[offset]);
1972 }
1973
1974 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1975 {
1976         int upos = 0, wpos = 0;
1977         const unsigned char *utf = (const unsigned char*) utfs;
1978         if (!utf || !wcs || wcslen < 1) {
1979                 errno = EINVAL;
1980                 return -1;
1981         }
1982         /* reserve space for \0 */
1983         wcslen--;
1984         if (utflen < 0)
1985                 utflen = INT_MAX;
1986
1987         while (upos < utflen) {
1988                 int c = utf[upos++] & 0xff;
1989                 if (utflen == INT_MAX && c == 0)
1990                         break;
1991
1992                 if (wpos >= wcslen) {
1993                         wcs[wpos] = 0;
1994                         errno = ERANGE;
1995                         return -1;
1996                 }
1997
1998                 if (c < 0x80) {
1999                         /* ASCII */
2000                         wcs[wpos++] = c;
2001                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2002                                 (utf[upos] & 0xc0) == 0x80) {
2003                         /* 2-byte utf-8 */
2004                         c = ((c & 0x1f) << 6);
2005                         c |= (utf[upos++] & 0x3f);
2006                         wcs[wpos++] = c;
2007                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2008                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2009                                 (utf[upos] & 0xc0) == 0x80 &&
2010                                 (utf[upos + 1] & 0xc0) == 0x80) {
2011                         /* 3-byte utf-8 */
2012                         c = ((c & 0x0f) << 12);
2013                         c |= ((utf[upos++] & 0x3f) << 6);
2014                         c |= (utf[upos++] & 0x3f);
2015                         wcs[wpos++] = c;
2016                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2017                                 wpos + 1 < wcslen &&
2018                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2019                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2020                                 (utf[upos] & 0xc0) == 0x80 &&
2021                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2022                                 (utf[upos + 2] & 0xc0) == 0x80) {
2023                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2024                         c = ((c & 0x07) << 18);
2025                         c |= ((utf[upos++] & 0x3f) << 12);
2026                         c |= ((utf[upos++] & 0x3f) << 6);
2027                         c |= (utf[upos++] & 0x3f);
2028                         c -= 0x10000;
2029                         wcs[wpos++] = 0xd800 | (c >> 10);
2030                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2031                 } else if (c >= 0xa0) {
2032                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2033                         wcs[wpos++] = c;
2034                 } else {
2035                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2036                         static const char *hex = "0123456789abcdef";
2037                         wcs[wpos++] = hex[c >> 4];
2038                         if (wpos < wcslen)
2039                                 wcs[wpos++] = hex[c & 0x0f];
2040                 }
2041         }
2042         wcs[wpos] = 0;
2043         return wpos;
2044 }
2045
2046 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2047 {
2048         if (!wcs || !utf || utflen < 1) {
2049                 errno = EINVAL;
2050                 return -1;
2051         }
2052         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2053         if (utflen)
2054                 return utflen - 1;
2055         errno = ERANGE;
2056         return -1;
2057 }
2058
2059 /*
2060  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2061  * mingw startup code, see init.c in mingw runtime).
2062  */
2063 int _CRT_glob = 0;
2064
2065 typedef struct {
2066         int newmode;
2067 } _startupinfo;
2068
2069 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2070                 _startupinfo *si);
2071
2072 static NORETURN void die_startup()
2073 {
2074         fputs("fatal: not enough memory for initialization", stderr);
2075         exit(128);
2076 }
2077
2078 static void *malloc_startup(size_t size)
2079 {
2080         void *result = malloc(size);
2081         if (!result)
2082                 die_startup();
2083         return result;
2084 }
2085
2086 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2087 {
2088         len = xwcstoutf(buffer, wcs, len) + 1;
2089         return memcpy(malloc_startup(len), buffer, len);
2090 }
2091
2092 void mingw_startup()
2093 {
2094         int i, maxlen, argc;
2095         char *buffer;
2096         wchar_t **wenv, **wargv;
2097         _startupinfo si;
2098
2099         /* get wide char arguments and environment */
2100         si.newmode = 0;
2101         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2102                 die_startup();
2103
2104         /* determine size of argv and environ conversion buffer */
2105         maxlen = wcslen(_wpgmptr);
2106         for (i = 1; i < argc; i++)
2107                 maxlen = max(maxlen, wcslen(wargv[i]));
2108         for (i = 0; wenv[i]; i++)
2109                 maxlen = max(maxlen, wcslen(wenv[i]));
2110
2111         /*
2112          * nedmalloc can't free CRT memory, allocate resizable environment
2113          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2114          * use it while initializing the environment itself.
2115          */
2116         environ_size = i + 1;
2117         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2118         environ = malloc_startup(environ_alloc);
2119
2120         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2121         maxlen = 3 * maxlen + 1;
2122         buffer = malloc_startup(maxlen);
2123
2124         /* convert command line arguments and environment to UTF-8 */
2125         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2126         for (i = 1; i < argc; i++)
2127                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2128         for (i = 0; wenv[i]; i++)
2129                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2130         environ[i] = NULL;
2131         free(buffer);
2132
2133         /* sort environment for O(log n) getenv / putenv */
2134         qsort(environ, i, sizeof(char*), compareenv);
2135
2136         /* initialize critical section for waitpid pinfo_t list */
2137         InitializeCriticalSection(&pinfo_cs);
2138
2139         /* set up default file mode and file modes for stdin/out/err */
2140         _fmode = _O_BINARY;
2141         _setmode(_fileno(stdin), _O_BINARY);
2142         _setmode(_fileno(stdout), _O_BINARY);
2143         _setmode(_fileno(stderr), _O_BINARY);
2144
2145         /* initialize Unicode console */
2146         winansi_init();
2147 }