compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <wchar.h>
   5 #include "../strbuf.h"
   6 #include "../run-command.h"
   7 #include "../cache.h"
   8
   9 #define HCAST(type, handle) ((type)(intptr_t)handle)
  10
  11 static const int delay[] = { 0, 1, 10, 20, 40 };
  12
  13 int err_win_to_posix(DWORD winerr)
  14 {
  15         int error = ENOSYS;
  16         switch(winerr) {
  17         case ERROR_ACCESS_DENIED: error = EACCES; break;
  18         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  19         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  20         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  21         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  22         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  23         case ERROR_BAD_COMMAND: error = EIO; break;
  24         case ERROR_BAD_DEVICE: error = ENODEV; break;
  25         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  26         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  27         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  28         case ERROR_BAD_LENGTH: error = EINVAL; break;
  29         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  30         case ERROR_BAD_PIPE: error = EPIPE; break;
  31         case ERROR_BAD_UNIT: error = ENODEV; break;
  32         case ERROR_BAD_USERNAME: error = EINVAL; break;
  33         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  34         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  35         case ERROR_BUSY: error = EBUSY; break;
  36         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  37         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  38         case ERROR_CANNOT_MAKE: error = EACCES; break;
  39         case ERROR_CANTOPEN: error = EIO; break;
  40         case ERROR_CANTREAD: error = EIO; break;
  41         case ERROR_CANTWRITE: error = EIO; break;
  42         case ERROR_CRC: error = EIO; break;
  43         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  44         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  45         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  46         case ERROR_DIRECTORY: error = EINVAL; break;
  47         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  48         case ERROR_DISK_CHANGE: error = EIO; break;
  49         case ERROR_DISK_FULL: error = ENOSPC; break;
  50         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  51         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  52         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  53         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  54         case ERROR_FILE_EXISTS: error = EEXIST; break;
  55         case ERROR_FILE_INVALID: error = ENODEV; break;
  56         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  57         case ERROR_GEN_FAILURE: error = EIO; break;
  58         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  59         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  60         case ERROR_INVALID_ACCESS: error = EACCES; break;
  61         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  62         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  63         case ERROR_INVALID_DATA: error = EINVAL; break;
  64         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  65         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  66         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  67         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  68         case ERROR_INVALID_HANDLE: error = EBADF; break;
  69         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  70         case ERROR_INVALID_NAME: error = EINVAL; break;
  71         case ERROR_INVALID_OWNER: error = EINVAL; break;
  72         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  73         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  74         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  75         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  76         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  77         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  78         case ERROR_IO_DEVICE: error = EIO; break;
  79         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  80         case ERROR_LOCKED: error = EBUSY; break;
  81         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  82         case ERROR_LOGON_FAILURE: error = EACCES; break;
  83         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  84         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  85         case ERROR_MORE_DATA: error = EPIPE; break;
  86         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  87         case ERROR_NOACCESS: error = EFAULT; break;
  88         case ERROR_NONE_MAPPED: error = EINVAL; break;
  89         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  90         case ERROR_NOT_READY: error = EAGAIN; break;
  91         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  92         case ERROR_NO_DATA: error = EPIPE; break;
  93         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  94         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  95         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  96         case ERROR_OPEN_FAILED: error = EIO; break;
  97         case ERROR_OPEN_FILES: error = EBUSY; break;
  98         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  99         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
 100         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 101         case ERROR_PATH_BUSY: error = EBUSY; break;
 102         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 103         case ERROR_PIPE_BUSY: error = EBUSY; break;
 104         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 105         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 106         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 107         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 108         case ERROR_READ_FAULT: error = EIO; break;
 109         case ERROR_SEEK: error = EIO; break;
 110         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 111         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 112         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 113         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 114         case ERROR_SWAPERROR: error = ENOENT; break;
 115         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 116         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 117         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 118         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 119         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 120         case ERROR_WRITE_FAULT: error = EIO; break;
 121         case ERROR_WRITE_PROTECT: error = EROFS; break;
 122         }
 123         return error;
 124 }
 125
 126 static inline int is_file_in_use_error(DWORD errcode)
 127 {
 128         switch (errcode) {
 129         case ERROR_SHARING_VIOLATION:
 130         case ERROR_ACCESS_DENIED:
 131                 return 1;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int read_yes_no_answer(void)
 138 {
 139         char answer[1024];
 140
 141         if (fgets(answer, sizeof(answer), stdin)) {
 142                 size_t answer_len = strlen(answer);
 143                 int got_full_line = 0, c;
 144
 145                 /* remove the newline */
 146                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 147                         answer[answer_len-2] = '\0';
 148                         got_full_line = 1;
 149                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 150                         answer[answer_len-1] = '\0';
 151                         got_full_line = 1;
 152                 }
 153                 /* flush the buffer in case we did not get the full line */
 154                 if (!got_full_line)
 155                         while ((c = getchar()) != EOF && c != '\n')
 156                                 ;
 157         } else
 158                 /* we could not read, return the
 159                  * default answer which is no */
 160                 return 0;
 161
 162         if (tolower(answer[0]) == 'y' && !answer[1])
 163                 return 1;
 164         if (!strncasecmp(answer, "yes", sizeof(answer)))
 165                 return 1;
 166         if (tolower(answer[0]) == 'n' && !answer[1])
 167                 return 0;
 168         if (!strncasecmp(answer, "no", sizeof(answer)))
 169                 return 0;
 170
 171         /* did not find an answer we understand */
 172         return -1;
 173 }
 174
 175 static int ask_yes_no_if_possible(const char *format, ...)
 176 {
 177         char question[4096];
 178         const char *retry_hook[] = { NULL, NULL, NULL };
 179         va_list args;
 180
 181         va_start(args, format);
 182         vsnprintf(question, sizeof(question), format, args);
 183         va_end(args);
 184
 185         if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 186                 retry_hook[1] = question;
 187                 return !run_command_v_opt(retry_hook, 0);
 188         }
 189
 190         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 191                 return 0;
 192
 193         while (1) {
 194                 int answer;
 195                 fprintf(stderr, "%s (y/n) ", question);
 196
 197                 if ((answer = read_yes_no_answer()) >= 0)
 198                         return answer;
 199
 200                 fprintf(stderr, "Sorry, I did not understand your answer. "
 201                                 "Please type 'y' or 'n'\n");
 202         }
 203 }
 204
 205 int mingw_unlink(const char *pathname)
 206 {
 207         int ret, tries = 0;
 208         wchar_t wpathname[MAX_PATH];
 209         if (xutftowcs_path(wpathname, pathname) < 0)
 210                 return -1;
 211
 212         /* read-only files cannot be removed */
 213         _wchmod(wpathname, 0666);
 214         while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 215                 if (!is_file_in_use_error(GetLastError()))
 216                         break;
 217                 /*
 218                  * We assume that some other process had the source or
 219                  * destination file open at the wrong moment and retry.
 220                  * In order to give the other process a higher chance to
 221                  * complete its operation, we give up our time slice now.
 222                  * If we have to retry again, we do sleep a bit.
 223                  */
 224                 Sleep(delay[tries]);
 225                 tries++;
 226         }
 227         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 228                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 229                         "Should I try again?", pathname))
 230                ret = _wunlink(wpathname);
 231         return ret;
 232 }
 233
 234 static int is_dir_empty(const wchar_t *wpath)
 235 {
 236         WIN32_FIND_DATAW findbuf;
 237         HANDLE handle;
 238         wchar_t wbuf[MAX_PATH + 2];
 239         wcscpy(wbuf, wpath);
 240         wcscat(wbuf, L"\\*");
 241         handle = FindFirstFileW(wbuf, &findbuf);
 242         if (handle == INVALID_HANDLE_VALUE)
 243                 return GetLastError() == ERROR_NO_MORE_FILES;
 244
 245         while (!wcscmp(findbuf.cFileName, L".") ||
 246                         !wcscmp(findbuf.cFileName, L".."))
 247                 if (!FindNextFileW(handle, &findbuf)) {
 248                         DWORD err = GetLastError();
 249                         FindClose(handle);
 250                         return err == ERROR_NO_MORE_FILES;
 251                 }
 252         FindClose(handle);
 253         return 0;
 254 }
 255
 256 int mingw_rmdir(const char *pathname)
 257 {
 258         int ret, tries = 0;
 259         wchar_t wpathname[MAX_PATH];
 260         if (xutftowcs_path(wpathname, pathname) < 0)
 261                 return -1;
 262
 263         while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 264                 if (!is_file_in_use_error(GetLastError()))
 265                         errno = err_win_to_posix(GetLastError());
 266                 if (errno != EACCES)
 267                         break;
 268                 if (!is_dir_empty(wpathname)) {
 269                         errno = ENOTEMPTY;
 270                         break;
 271                 }
 272                 /*
 273                  * We assume that some other process had the source or
 274                  * destination file open at the wrong moment and retry.
 275                  * In order to give the other process a higher chance to
 276                  * complete its operation, we give up our time slice now.
 277                  * If we have to retry again, we do sleep a bit.
 278                  */
 279                 Sleep(delay[tries]);
 280                 tries++;
 281         }
 282         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 283                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 284                         "Should I try again?", pathname))
 285                ret = _wrmdir(wpathname);
 286         return ret;
 287 }
 288
 289 int mingw_mkdir(const char *path, int mode)
 290 {
 291         int ret;
 292         wchar_t wpath[MAX_PATH];
 293         if (xutftowcs_path(wpath, path) < 0)
 294                 return -1;
 295         ret = _wmkdir(wpath);
 296         return ret;
 297 }
 298
 299 int mingw_open (const char *filename, int oflags, ...)
 300 {
 301         va_list args;
 302         unsigned mode;
 303         int fd;
 304         wchar_t wfilename[MAX_PATH];
 305
 306         va_start(args, oflags);
 307         mode = va_arg(args, int);
 308         va_end(args);
 309
 310         if (filename && !strcmp(filename, "/dev/null"))
 311                 filename = "nul";
 312
 313         if (xutftowcs_path(wfilename, filename) < 0)
 314                 return -1;
 315         fd = _wopen(wfilename, oflags, mode);
 316
 317         if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 318                 DWORD attrs = GetFileAttributesW(wfilename);
 319                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 320                         errno = EISDIR;
 321         }
 322         return fd;
 323 }
 324
 325 static BOOL WINAPI ctrl_ignore(DWORD type)
 326 {
 327         return TRUE;
 328 }
 329
 330 #undef fgetc
 331 int mingw_fgetc(FILE *stream)
 332 {
 333         int ch;
 334         if (!isatty(_fileno(stream)))
 335                 return fgetc(stream);
 336
 337         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 338         while (1) {
 339                 ch = fgetc(stream);
 340                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 341                         break;
 342
 343                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 344                 mingw_raise(SIGINT);
 345         }
 346         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 347         return ch;
 348 }
 349
 350 #undef fopen
 351 FILE *mingw_fopen (const char *filename, const char *otype)
 352 {
 353         FILE *file;
 354         wchar_t wfilename[MAX_PATH], wotype[4];
 355         if (filename && !strcmp(filename, "/dev/null"))
 356                 filename = "nul";
 357         if (xutftowcs_path(wfilename, filename) < 0 ||
 358                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 359                 return NULL;
 360         file = _wfopen(wfilename, wotype);
 361         return file;
 362 }
 363
 364 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 365 {
 366         FILE *file;
 367         wchar_t wfilename[MAX_PATH], wotype[4];
 368         if (filename && !strcmp(filename, "/dev/null"))
 369                 filename = "nul";
 370         if (xutftowcs_path(wfilename, filename) < 0 ||
 371                 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 372                 return NULL;
 373         file = _wfreopen(wfilename, wotype, stream);
 374         return file;
 375 }
 376
 377 #undef fflush
 378 int mingw_fflush(FILE *stream)
 379 {
 380         int ret = fflush(stream);
 381
 382         /*
 383          * write() is used behind the scenes of stdio output functions.
 384          * Since git code does not check for errors after each stdio write
 385          * operation, it can happen that write() is called by a later
 386          * stdio function even if an earlier write() call failed. In the
 387          * case of a pipe whose readable end was closed, only the first
 388          * call to write() reports EPIPE on Windows. Subsequent write()
 389          * calls report EINVAL. It is impossible to notice whether this
 390          * fflush invocation triggered such a case, therefore, we have to
 391          * catch all EINVAL errors whole-sale.
 392          */
 393         if (ret && errno == EINVAL)
 394                 errno = EPIPE;
 395
 396         return ret;
 397 }
 398
 399 #undef write
 400 ssize_t mingw_write(int fd, const void *buf, size_t len)
 401 {
 402         ssize_t result = write(fd, buf, len);
 403
 404         if (result < 0 && errno == EINVAL && buf) {
 405                 /* check if fd is a pipe */
 406                 HANDLE h = (HANDLE) _get_osfhandle(fd);
 407                 if (GetFileType(h) == FILE_TYPE_PIPE)
 408                         errno = EPIPE;
 409                 else
 410                         errno = EINVAL;
 411         }
 412
 413         return result;
 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 int mingw_fstat(int fd, struct stat *buf)
 567 {
 568         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 569         BY_HANDLE_FILE_INFORMATION fdata;
 570
 571         if (fh == INVALID_HANDLE_VALUE) {
 572                 errno = EBADF;
 573                 return -1;
 574         }
 575         /* direct non-file handles to MS's fstat() */
 576         if (GetFileType(fh) != FILE_TYPE_DISK)
 577                 return _fstati64(fd, buf);
 578
 579         if (GetFileInformationByHandle(fh, &fdata)) {
 580                 buf->st_ino = 0;
 581                 buf->st_gid = 0;
 582                 buf->st_uid = 0;
 583                 buf->st_nlink = 1;
 584                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 585                 buf->st_size = fdata.nFileSizeLow |
 586                         (((off_t)fdata.nFileSizeHigh)<<32);
 587                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 588                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 589                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 590                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 591                 return 0;
 592         }
 593         errno = EBADF;
 594         return -1;
 595 }
 596
 597 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 598 {
 599         long long winTime = t * 10000000LL + 116444736000000000LL;
 600         ft->dwLowDateTime = winTime;
 601         ft->dwHighDateTime = winTime >> 32;
 602 }
 603
 604 int mingw_utime (const char *file_name, const struct utimbuf *times)
 605 {
 606         FILETIME mft, aft;
 607         int fh, rc;
 608         DWORD attrs;
 609         wchar_t wfilename[MAX_PATH];
 610         if (xutftowcs_path(wfilename, file_name) < 0)
 611                 return -1;
 612
 613         /* must have write permission */
 614         attrs = GetFileAttributesW(wfilename);
 615         if (attrs != INVALID_FILE_ATTRIBUTES &&
 616             (attrs & FILE_ATTRIBUTE_READONLY)) {
 617                 /* ignore errors here; open() will report them */
 618                 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 619         }
 620
 621         if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 622                 rc = -1;
 623                 goto revert_attrs;
 624         }
 625
 626         if (times) {
 627                 time_t_to_filetime(times->modtime, &mft);
 628                 time_t_to_filetime(times->actime, &aft);
 629         } else {
 630                 GetSystemTimeAsFileTime(&mft);
 631                 aft = mft;
 632         }
 633         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 634                 errno = EINVAL;
 635                 rc = -1;
 636         } else
 637                 rc = 0;
 638         close(fh);
 639
 640 revert_attrs:
 641         if (attrs != INVALID_FILE_ATTRIBUTES &&
 642             (attrs & FILE_ATTRIBUTE_READONLY)) {
 643                 /* ignore errors again */
 644                 SetFileAttributesW(wfilename, attrs);
 645         }
 646         return rc;
 647 }
 648
 649 unsigned int sleep (unsigned int seconds)
 650 {
 651         Sleep(seconds*1000);
 652         return 0;
 653 }
 654
 655 char *mingw_mktemp(char *template)
 656 {
 657         wchar_t wtemplate[MAX_PATH];
 658         if (xutftowcs_path(wtemplate, template) < 0)
 659                 return NULL;
 660         if (!_wmktemp(wtemplate))
 661                 return NULL;
 662         if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 663                 return NULL;
 664         return template;
 665 }
 666
 667 int mkstemp(char *template)
 668 {
 669         char *filename = mktemp(template);
 670         if (filename == NULL)
 671                 return -1;
 672         return open(filename, O_RDWR | O_CREAT, 0600);
 673 }
 674
 675 int gettimeofday(struct timeval *tv, void *tz)
 676 {
 677         FILETIME ft;
 678         long long hnsec;
 679
 680         GetSystemTimeAsFileTime(&ft);
 681         hnsec = filetime_to_hnsec(&ft);
 682         tv->tv_sec = hnsec / 10000000;
 683         tv->tv_usec = (hnsec % 10000000) / 10;
 684         return 0;
 685 }
 686
 687 int pipe(int filedes[2])
 688 {
 689         HANDLE h[2];
 690
 691         /* this creates non-inheritable handles */
 692         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 693                 errno = err_win_to_posix(GetLastError());
 694                 return -1;
 695         }
 696         filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
 697         if (filedes[0] < 0) {
 698                 CloseHandle(h[0]);
 699                 CloseHandle(h[1]);
 700                 return -1;
 701         }
 702         filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
 703         if (filedes[1] < 0) {
 704                 close(filedes[0]);
 705                 CloseHandle(h[1]);
 706                 return -1;
 707         }
 708         return 0;
 709 }
 710
 711 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 712 {
 713         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 714         memcpy(result, gmtime(timep), sizeof(struct tm));
 715         return result;
 716 }
 717
 718 struct tm *localtime_r(const time_t *timep, struct tm *result)
 719 {
 720         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 721         memcpy(result, localtime(timep), sizeof(struct tm));
 722         return result;
 723 }
 724
 725 char *mingw_getcwd(char *pointer, int len)
 726 {
 727         int i;
 728         wchar_t wpointer[MAX_PATH];
 729         if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 730                 return NULL;
 731         if (xwcstoutf(pointer, wpointer, len) < 0)
 732                 return NULL;
 733         for (i = 0; pointer[i]; i++)
 734                 if (pointer[i] == '\\')
 735                         pointer[i] = '/';
 736         return pointer;
 737 }
 738
 739 /*
 740  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 741  * (Parsing C++ Command-Line Arguments)
 742  */
 743 static const char *quote_arg(const char *arg)
 744 {
 745         /* count chars to quote */
 746         int len = 0, n = 0;
 747         int force_quotes = 0;
 748         char *q, *d;
 749         const char *p = arg;
 750         if (!*p) force_quotes = 1;
 751         while (*p) {
 752                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 753                         force_quotes = 1;
 754                 else if (*p == '"')
 755                         n++;
 756                 else if (*p == '\\') {
 757                         int count = 0;
 758                         while (*p == '\\') {
 759                                 count++;
 760                                 p++;
 761                                 len++;
 762                         }
 763                         if (*p == '"')
 764                                 n += count*2 + 1;
 765                         continue;
 766                 }
 767                 len++;
 768                 p++;
 769         }
 770         if (!force_quotes && n == 0)
 771                 return arg;
 772
 773         /* insert \ where necessary */
 774         d = q = xmalloc(len+n+3);
 775         *d++ = '"';
 776         while (*arg) {
 777                 if (*arg == '"')
 778                         *d++ = '\\';
 779                 else if (*arg == '\\') {
 780                         int count = 0;
 781                         while (*arg == '\\') {
 782                                 count++;
 783                                 *d++ = *arg++;
 784                         }
 785                         if (*arg == '"') {
 786                                 while (count-- > 0)
 787                                         *d++ = '\\';
 788                                 *d++ = '\\';
 789                         }
 790                 }
 791                 *d++ = *arg++;
 792         }
 793         *d++ = '"';
 794         *d++ = 0;
 795         return q;
 796 }
 797
 798 static const char *parse_interpreter(const char *cmd)
 799 {
 800         static char buf[100];
 801         char *p, *opt;
 802         int n, fd;
 803
 804         /* don't even try a .exe */
 805         n = strlen(cmd);
 806         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 807                 return NULL;
 808
 809         fd = open(cmd, O_RDONLY);
 810         if (fd < 0)
 811                 return NULL;
 812         n = read(fd, buf, sizeof(buf)-1);
 813         close(fd);
 814         if (n < 4)      /* at least '#!/x' and not error */
 815                 return NULL;
 816
 817         if (buf[0] != '#' || buf[1] != '!')
 818                 return NULL;
 819         buf[n] = '\0';
 820         p = buf + strcspn(buf, "\r\n");
 821         if (!*p)
 822                 return NULL;
 823
 824         *p = '\0';
 825         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 826                 return NULL;
 827         /* strip options */
 828         if ((opt = strchr(p+1, ' ')))
 829                 *opt = '\0';
 830         return p+1;
 831 }
 832
 833 /*
 834  * Splits the PATH into parts.
 835  */
 836 static char **get_path_split(void)
 837 {
 838         char *p, **path, *envpath = mingw_getenv("PATH");
 839         int i, n = 0;
 840
 841         if (!envpath || !*envpath)
 842                 return NULL;
 843
 844         envpath = xstrdup(envpath);
 845         p = envpath;
 846         while (p) {
 847                 char *dir = p;
 848                 p = strchr(p, ';');
 849                 if (p) *p++ = '\0';
 850                 if (*dir) {     /* not earlier, catches series of ; */
 851                         ++n;
 852                 }
 853         }
 854         if (!n)
 855                 return NULL;
 856
 857         path = xmalloc((n+1)*sizeof(char *));
 858         p = envpath;
 859         i = 0;
 860         do {
 861                 if (*p)
 862                         path[i++] = xstrdup(p);
 863                 p = p+strlen(p)+1;
 864         } while (i < n);
 865         path[i] = NULL;
 866
 867         free(envpath);
 868
 869         return path;
 870 }
 871
 872 static void free_path_split(char **path)
 873 {
 874         char **p = path;
 875
 876         if (!path)
 877                 return;
 878
 879         while (*p)
 880                 free(*p++);
 881         free(path);
 882 }
 883
 884 /*
 885  * exe_only means that we only want to detect .exe files, but not scripts
 886  * (which do not have an extension)
 887  */
 888 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 889 {
 890         char path[MAX_PATH];
 891         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 892
 893         if (!isexe && access(path, F_OK) == 0)
 894                 return xstrdup(path);
 895         path[strlen(path)-4] = '\0';
 896         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 897                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 898                         return xstrdup(path);
 899         return NULL;
 900 }
 901
 902 /*
 903  * Determines the absolute path of cmd using the split path in path.
 904  * If cmd contains a slash or backslash, no lookup is performed.
 905  */
 906 static char *path_lookup(const char *cmd, char **path, int exe_only)
 907 {
 908         char *prog = NULL;
 909         int len = strlen(cmd);
 910         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 911
 912         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 913                 prog = xstrdup(cmd);
 914
 915         while (!prog && *path)
 916                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 917
 918         return prog;
 919 }
 920
 921 static int do_putenv(char **env, const char *name, int size, int free_old);
 922
 923 /* used number of elements of environ array, including terminating NULL */
 924 static int environ_size = 0;
 925 /* allocated size of environ array, in bytes */
 926 static int environ_alloc = 0;
 927
 928 /*
 929  * Create environment block suitable for CreateProcess. Merges current
 930  * process environment and the supplied environment changes.
 931  */
 932 static wchar_t *make_environment_block(char **deltaenv)
 933 {
 934         wchar_t *wenvblk = NULL;
 935         char **tmpenv;
 936         int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
 937
 938         while (deltaenv && deltaenv[i])
 939                 i++;
 940
 941         /* copy the environment, leaving space for changes */
 942         tmpenv = xmalloc((size + i) * sizeof(char*));
 943         memcpy(tmpenv, environ, size * sizeof(char*));
 944
 945         /* merge supplied environment changes into the temporary environment */
 946         for (i = 0; deltaenv && deltaenv[i]; i++)
 947                 size = do_putenv(tmpenv, deltaenv[i], size, 0);
 948
 949         /* create environment block from temporary environment */
 950         for (i = 0; tmpenv[i]; i++) {
 951                 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
 952                 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
 953                 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
 954         }
 955         /* add final \0 terminator */
 956         wenvblk[wenvpos] = 0;
 957         free(tmpenv);
 958         return wenvblk;
 959 }
 960
 961 struct pinfo_t {
 962         struct pinfo_t *next;
 963         pid_t pid;
 964         HANDLE proc;
 965 };
 966 static struct pinfo_t *pinfo = NULL;
 967 CRITICAL_SECTION pinfo_cs;
 968
 969 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
 970                               const char *dir,
 971                               int prepend_cmd, int fhin, int fhout, int fherr)
 972 {
 973         STARTUPINFOW si;
 974         PROCESS_INFORMATION pi;
 975         struct strbuf args;
 976         wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
 977         unsigned flags = CREATE_UNICODE_ENVIRONMENT;
 978         BOOL ret;
 979
 980         /* Determine whether or not we are associated to a console */
 981         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 982                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 983                         FILE_ATTRIBUTE_NORMAL, NULL);
 984         if (cons == INVALID_HANDLE_VALUE) {
 985                 /* There is no console associated with this process.
 986                  * Since the child is a console process, Windows
 987                  * would normally create a console window. But
 988                  * since we'll be redirecting std streams, we do
 989                  * not need the console.
 990                  * It is necessary to use DETACHED_PROCESS
 991                  * instead of CREATE_NO_WINDOW to make ssh
 992                  * recognize that it has no console.
 993                  */
 994                 flags |= DETACHED_PROCESS;
 995         } else {
 996                 /* There is already a console. If we specified
 997                  * DETACHED_PROCESS here, too, Windows would
 998                  * disassociate the child from the console.
 999                  * The same is true for CREATE_NO_WINDOW.
1000                  * Go figure!
1001                  */
1002                 CloseHandle(cons);
1003         }
1004         memset(&si, 0, sizeof(si));
1005         si.cb = sizeof(si);
1006         si.dwFlags = STARTF_USESTDHANDLES;
1007         si.hStdInput = winansi_get_osfhandle(fhin);
1008         si.hStdOutput = winansi_get_osfhandle(fhout);
1009         si.hStdError = winansi_get_osfhandle(fherr);
1010
1011         if (xutftowcs_path(wcmd, cmd) < 0)
1012                 return -1;
1013         if (dir && xutftowcs_path(wdir, dir) < 0)
1014                 return -1;
1015
1016         /* concatenate argv, quoting args as we go */
1017         strbuf_init(&args, 0);
1018         if (prepend_cmd) {
1019                 char *quoted = (char *)quote_arg(cmd);
1020                 strbuf_addstr(&args, quoted);
1021                 if (quoted != cmd)
1022                         free(quoted);
1023         }
1024         for (; *argv; argv++) {
1025                 char *quoted = (char *)quote_arg(*argv);
1026                 if (*args.buf)
1027                         strbuf_addch(&args, ' ');
1028                 strbuf_addstr(&args, quoted);
1029                 if (quoted != *argv)
1030                         free(quoted);
1031         }
1032
1033         wargs = xmalloc((2 * args.len + 1) * sizeof(wchar_t));
1034         xutftowcs(wargs, args.buf, 2 * args.len + 1);
1035         strbuf_release(&args);
1036
1037         wenvblk = make_environment_block(deltaenv);
1038
1039         memset(&pi, 0, sizeof(pi));
1040         ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1041                 wenvblk, dir ? wdir : NULL, &si, &pi);
1042
1043         free(wenvblk);
1044         free(wargs);
1045
1046         if (!ret) {
1047                 errno = ENOENT;
1048                 return -1;
1049         }
1050         CloseHandle(pi.hThread);
1051
1052         /*
1053          * The process ID is the human-readable identifier of the process
1054          * that we want to present in log and error messages. The handle
1055          * is not useful for this purpose. But we cannot close it, either,
1056          * because it is not possible to turn a process ID into a process
1057          * handle after the process terminated.
1058          * Keep the handle in a list for waitpid.
1059          */
1060         EnterCriticalSection(&pinfo_cs);
1061         {
1062                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1063                 info->pid = pi.dwProcessId;
1064                 info->proc = pi.hProcess;
1065                 info->next = pinfo;
1066                 pinfo = info;
1067         }
1068         LeaveCriticalSection(&pinfo_cs);
1069
1070         return (pid_t)pi.dwProcessId;
1071 }
1072
1073 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1074 {
1075         return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1076 }
1077
1078 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1079                      const char *dir,
1080                      int fhin, int fhout, int fherr)
1081 {
1082         pid_t pid;
1083         char **path = get_path_split();
1084         char *prog = path_lookup(cmd, path, 0);
1085
1086         if (!prog) {
1087                 errno = ENOENT;
1088                 pid = -1;
1089         }
1090         else {
1091                 const char *interpr = parse_interpreter(prog);
1092
1093                 if (interpr) {
1094                         const char *argv0 = argv[0];
1095                         char *iprog = path_lookup(interpr, path, 1);
1096                         argv[0] = prog;
1097                         if (!iprog) {
1098                                 errno = ENOENT;
1099                                 pid = -1;
1100                         }
1101                         else {
1102                                 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1103                                                        fhin, fhout, fherr);
1104                                 free(iprog);
1105                         }
1106                         argv[0] = argv0;
1107                 }
1108                 else
1109                         pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1110                                                fhin, fhout, fherr);
1111                 free(prog);
1112         }
1113         free_path_split(path);
1114         return pid;
1115 }
1116
1117 static int try_shell_exec(const char *cmd, char *const *argv)
1118 {
1119         const char *interpr = parse_interpreter(cmd);
1120         char **path;
1121         char *prog;
1122         int pid = 0;
1123
1124         if (!interpr)
1125                 return 0;
1126         path = get_path_split();
1127         prog = path_lookup(interpr, path, 1);
1128         if (prog) {
1129                 int argc = 0;
1130                 const char **argv2;
1131                 while (argv[argc]) argc++;
1132                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1133                 argv2[0] = (char *)cmd; /* full path to the script file */
1134                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1135                 pid = mingw_spawnv(prog, argv2, 1);
1136                 if (pid >= 0) {
1137                         int status;
1138                         if (waitpid(pid, &status, 0) < 0)
1139                                 status = 255;
1140                         exit(status);
1141                 }
1142                 pid = 1;        /* indicate that we tried but failed */
1143                 free(prog);
1144                 free(argv2);
1145         }
1146         free_path_split(path);
1147         return pid;
1148 }
1149
1150 int mingw_execv(const char *cmd, char *const *argv)
1151 {
1152         /* check if git_command is a shell script */
1153         if (!try_shell_exec(cmd, argv)) {
1154                 int pid, status;
1155
1156                 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1157                 if (pid < 0)
1158                         return -1;
1159                 if (waitpid(pid, &status, 0) < 0)
1160                         status = 255;
1161                 exit(status);
1162         }
1163         return -1;
1164 }
1165
1166 int mingw_execvp(const char *cmd, char *const *argv)
1167 {
1168         char **path = get_path_split();
1169         char *prog = path_lookup(cmd, path, 0);
1170
1171         if (prog) {
1172                 mingw_execv(prog, argv);
1173                 free(prog);
1174         } else
1175                 errno = ENOENT;
1176
1177         free_path_split(path);
1178         return -1;
1179 }
1180
1181 int mingw_kill(pid_t pid, int sig)
1182 {
1183         if (pid > 0 && sig == SIGTERM) {
1184                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1185
1186                 if (TerminateProcess(h, -1)) {
1187                         CloseHandle(h);
1188                         return 0;
1189                 }
1190
1191                 errno = err_win_to_posix(GetLastError());
1192                 CloseHandle(h);
1193                 return -1;
1194         } else if (pid > 0 && sig == 0) {
1195                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1196                 if (h) {
1197                         CloseHandle(h);
1198                         return 0;
1199                 }
1200         }
1201
1202         errno = EINVAL;
1203         return -1;
1204 }
1205
1206 /*
1207  * Compare environment entries by key (i.e. stopping at '=' or '\0').
1208  */
1209 static int compareenv(const void *v1, const void *v2)
1210 {
1211         const char *e1 = *(const char**)v1;
1212         const char *e2 = *(const char**)v2;
1213
1214         for (;;) {
1215                 int c1 = *e1++;
1216                 int c2 = *e2++;
1217                 c1 = (c1 == '=') ? 0 : tolower(c1);
1218                 c2 = (c2 == '=') ? 0 : tolower(c2);
1219                 if (c1 > c2)
1220                         return 1;
1221                 if (c1 < c2)
1222                         return -1;
1223                 if (c1 == 0)
1224                         return 0;
1225         }
1226 }
1227
1228 static int bsearchenv(char **env, const char *name, size_t size)
1229 {
1230         unsigned low = 0, high = size;
1231         while (low < high) {
1232                 unsigned mid = low + ((high - low) >> 1);
1233                 int cmp = compareenv(&env[mid], &name);
1234                 if (cmp < 0)
1235                         low = mid + 1;
1236                 else if (cmp > 0)
1237                         high = mid;
1238                 else
1239                         return mid;
1240         }
1241         return ~low; /* not found, return 1's complement of insert position */
1242 }
1243
1244 /*
1245  * If name contains '=', then sets the variable, otherwise it unsets it
1246  * Size includes the terminating NULL. Env must have room for size + 1 entries
1247  * (in case of insert). Returns the new size. Optionally frees removed entries.
1248  */
1249 static int do_putenv(char **env, const char *name, int size, int free_old)
1250 {
1251         int i = bsearchenv(env, name, size - 1);
1252
1253         /* optionally free removed / replaced entry */
1254         if (i >= 0 && free_old)
1255                 free(env[i]);
1256
1257         if (strchr(name, '=')) {
1258                 /* if new value ('key=value') is specified, insert or replace entry */
1259                 if (i < 0) {
1260                         i = ~i;
1261                         memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1262                         size++;
1263                 }
1264                 env[i] = (char*) name;
1265         } else if (i >= 0) {
1266                 /* otherwise ('key') remove existing entry */
1267                 size--;
1268                 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1269         }
1270         return size;
1271 }
1272
1273 char *mingw_getenv(const char *name)
1274 {
1275         char *value;
1276         int pos = bsearchenv(environ, name, environ_size - 1);
1277         if (pos < 0)
1278                 return NULL;
1279         value = strchr(environ[pos], '=');
1280         return value ? &value[1] : NULL;
1281 }
1282
1283 int mingw_putenv(const char *namevalue)
1284 {
1285         ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1286         environ_size = do_putenv(environ, namevalue, environ_size, 1);
1287         return 0;
1288 }
1289
1290 /*
1291  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1292  * that service contains a numerical port, or that it is null. It
1293  * does a simple search using gethostbyname, and returns one IPv4 host
1294  * if one was found.
1295  */
1296 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1297                                    const struct addrinfo *hints,
1298                                    struct addrinfo **res)
1299 {
1300         struct hostent *h = NULL;
1301         struct addrinfo *ai;
1302         struct sockaddr_in *sin;
1303
1304         if (node) {
1305                 h = gethostbyname(node);
1306                 if (!h)
1307                         return WSAGetLastError();
1308         }
1309
1310         ai = xmalloc(sizeof(struct addrinfo));
1311         *res = ai;
1312         ai->ai_flags = 0;
1313         ai->ai_family = AF_INET;
1314         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1315         switch (ai->ai_socktype) {
1316         case SOCK_STREAM:
1317                 ai->ai_protocol = IPPROTO_TCP;
1318                 break;
1319         case SOCK_DGRAM:
1320                 ai->ai_protocol = IPPROTO_UDP;
1321                 break;
1322         default:
1323                 ai->ai_protocol = 0;
1324                 break;
1325         }
1326         ai->ai_addrlen = sizeof(struct sockaddr_in);
1327         if (hints && (hints->ai_flags & AI_CANONNAME))
1328                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1329         else
1330                 ai->ai_canonname = NULL;
1331
1332         sin = xcalloc(1, ai->ai_addrlen);
1333         sin->sin_family = AF_INET;
1334         /* Note: getaddrinfo is supposed to allow service to be a string,
1335          * which should be looked up using getservbyname. This is
1336          * currently not implemented */
1337         if (service)
1338                 sin->sin_port = htons(atoi(service));
1339         if (h)
1340                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1341         else if (hints && (hints->ai_flags & AI_PASSIVE))
1342                 sin->sin_addr.s_addr = INADDR_ANY;
1343         else
1344                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1345         ai->ai_addr = (struct sockaddr *)sin;
1346         ai->ai_next = NULL;
1347         return 0;
1348 }
1349
1350 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1351 {
1352         free(res->ai_canonname);
1353         free(res->ai_addr);
1354         free(res);
1355 }
1356
1357 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1358                                    char *host, DWORD hostlen,
1359                                    char *serv, DWORD servlen, int flags)
1360 {
1361         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1362         if (sa->sa_family != AF_INET)
1363                 return EAI_FAMILY;
1364         if (!host && !serv)
1365                 return EAI_NONAME;
1366
1367         if (host && hostlen > 0) {
1368                 struct hostent *ent = NULL;
1369                 if (!(flags & NI_NUMERICHOST))
1370                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1371                                             sizeof(sin->sin_addr), AF_INET);
1372
1373                 if (ent)
1374                         snprintf(host, hostlen, "%s", ent->h_name);
1375                 else if (flags & NI_NAMEREQD)
1376                         return EAI_NONAME;
1377                 else
1378                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1379         }
1380
1381         if (serv && servlen > 0) {
1382                 struct servent *ent = NULL;
1383                 if (!(flags & NI_NUMERICSERV))
1384                         ent = getservbyport(sin->sin_port,
1385                                             flags & NI_DGRAM ? "udp" : "tcp");
1386
1387                 if (ent)
1388                         snprintf(serv, servlen, "%s", ent->s_name);
1389                 else
1390                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1391         }
1392
1393         return 0;
1394 }
1395
1396 static HMODULE ipv6_dll = NULL;
1397 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1398 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1399                                       const struct addrinfo *hints,
1400                                       struct addrinfo **res);
1401 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1402                                       char *host, DWORD hostlen,
1403                                       char *serv, DWORD servlen, int flags);
1404 /*
1405  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1406  * don't need to try to load that one dynamically.
1407  */
1408
1409 static void socket_cleanup(void)
1410 {
1411         WSACleanup();
1412         if (ipv6_dll)
1413                 FreeLibrary(ipv6_dll);
1414         ipv6_dll = NULL;
1415         ipv6_freeaddrinfo = freeaddrinfo_stub;
1416         ipv6_getaddrinfo = getaddrinfo_stub;
1417         ipv6_getnameinfo = getnameinfo_stub;
1418 }
1419
1420 static void ensure_socket_initialization(void)
1421 {
1422         WSADATA wsa;
1423         static int initialized = 0;
1424         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1425         const char **name;
1426
1427         if (initialized)
1428                 return;
1429
1430         if (WSAStartup(MAKEWORD(2,2), &wsa))
1431                 die("unable to initialize winsock subsystem, error %d",
1432                         WSAGetLastError());
1433
1434         for (name = libraries; *name; name++) {
1435                 ipv6_dll = LoadLibrary(*name);
1436                 if (!ipv6_dll)
1437                         continue;
1438
1439                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1440                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1441                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1442                                                    const struct addrinfo *,
1443                                                    struct addrinfo **))
1444                         GetProcAddress(ipv6_dll, "getaddrinfo");
1445                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1446                                                    socklen_t, char *, DWORD,
1447                                                    char *, DWORD, int))
1448                         GetProcAddress(ipv6_dll, "getnameinfo");
1449                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1450                         FreeLibrary(ipv6_dll);
1451                         ipv6_dll = NULL;
1452                 } else
1453                         break;
1454         }
1455         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1456                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1457                 ipv6_getaddrinfo = getaddrinfo_stub;
1458                 ipv6_getnameinfo = getnameinfo_stub;
1459         }
1460
1461         atexit(socket_cleanup);
1462         initialized = 1;
1463 }
1464
1465 #undef gethostname
1466 int mingw_gethostname(char *name, int namelen)
1467 {
1468     ensure_socket_initialization();
1469     return gethostname(name, namelen);
1470 }
1471
1472 #undef gethostbyname
1473 struct hostent *mingw_gethostbyname(const char *host)
1474 {
1475         ensure_socket_initialization();
1476         return gethostbyname(host);
1477 }
1478
1479 void mingw_freeaddrinfo(struct addrinfo *res)
1480 {
1481         ipv6_freeaddrinfo(res);
1482 }
1483
1484 int mingw_getaddrinfo(const char *node, const char *service,
1485                       const struct addrinfo *hints, struct addrinfo **res)
1486 {
1487         ensure_socket_initialization();
1488         return ipv6_getaddrinfo(node, service, hints, res);
1489 }
1490
1491 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1492                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1493                       int flags)
1494 {
1495         ensure_socket_initialization();
1496         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1497 }
1498
1499 int mingw_socket(int domain, int type, int protocol)
1500 {
1501         int sockfd;
1502         SOCKET s;
1503
1504         ensure_socket_initialization();
1505         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1506         if (s == INVALID_SOCKET) {
1507                 /*
1508                  * WSAGetLastError() values are regular BSD error codes
1509                  * biased by WSABASEERR.
1510                  * However, strerror() does not know about networking
1511                  * specific errors, which are values beginning at 38 or so.
1512                  * Therefore, we choose to leave the biased error code
1513                  * in errno so that _if_ someone looks up the code somewhere,
1514                  * then it is at least the number that are usually listed.
1515                  */
1516                 errno = WSAGetLastError();
1517                 return -1;
1518         }
1519         /* convert into a file descriptor */
1520         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1521                 closesocket(s);
1522                 return error("unable to make a socket file descriptor: %s",
1523                         strerror(errno));
1524         }
1525         return sockfd;
1526 }
1527
1528 #undef connect
1529 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1530 {
1531         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1532         return connect(s, sa, sz);
1533 }
1534
1535 #undef bind
1536 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1537 {
1538         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1539         return bind(s, sa, sz);
1540 }
1541
1542 #undef setsockopt
1543 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1544 {
1545         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1546         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1547 }
1548
1549 #undef shutdown
1550 int mingw_shutdown(int sockfd, int how)
1551 {
1552         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1553         return shutdown(s, how);
1554 }
1555
1556 #undef listen
1557 int mingw_listen(int sockfd, int backlog)
1558 {
1559         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1560         return listen(s, backlog);
1561 }
1562
1563 #undef accept
1564 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1565 {
1566         int sockfd2;
1567
1568         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1569         SOCKET s2 = accept(s1, sa, sz);
1570
1571         /* convert into a file descriptor */
1572         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1573                 int err = errno;
1574                 closesocket(s2);
1575                 return error("unable to make a socket file descriptor: %s",
1576                         strerror(err));
1577         }
1578         return sockfd2;
1579 }
1580
1581 #undef rename
1582 int mingw_rename(const char *pold, const char *pnew)
1583 {
1584         DWORD attrs, gle;
1585         int tries = 0;
1586         wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1587         if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1588                 return -1;
1589
1590         /*
1591          * Try native rename() first to get errno right.
1592          * It is based on MoveFile(), which cannot overwrite existing files.
1593          */
1594         if (!_wrename(wpold, wpnew))
1595                 return 0;
1596         if (errno != EEXIST)
1597                 return -1;
1598 repeat:
1599         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1600                 return 0;
1601         /* TODO: translate more errors */
1602         gle = GetLastError();
1603         if (gle == ERROR_ACCESS_DENIED &&
1604             (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1605                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1606                         errno = EISDIR;
1607                         return -1;
1608                 }
1609                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1610                     SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1611                         if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1612                                 return 0;
1613                         gle = GetLastError();
1614                         /* revert file attributes on failure */
1615                         SetFileAttributesW(wpnew, attrs);
1616                 }
1617         }
1618         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1619                 /*
1620                  * We assume that some other process had the source or
1621                  * destination file open at the wrong moment and retry.
1622                  * In order to give the other process a higher chance to
1623                  * complete its operation, we give up our time slice now.
1624                  * If we have to retry again, we do sleep a bit.
1625                  */
1626                 Sleep(delay[tries]);
1627                 tries++;
1628                 goto repeat;
1629         }
1630         if (gle == ERROR_ACCESS_DENIED &&
1631                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1632                        "Should I try again?", pold, pnew))
1633                 goto repeat;
1634
1635         errno = EACCES;
1636         return -1;
1637 }
1638
1639 /*
1640  * Note that this doesn't return the actual pagesize, but
1641  * the allocation granularity. If future Windows specific git code
1642  * needs the real getpagesize function, we need to find another solution.
1643  */
1644 int mingw_getpagesize(void)
1645 {
1646         SYSTEM_INFO si;
1647         GetSystemInfo(&si);
1648         return si.dwAllocationGranularity;
1649 }
1650
1651 struct passwd *getpwuid(int uid)
1652 {
1653         static char user_name[100];
1654         static struct passwd p;
1655
1656         DWORD len = sizeof(user_name);
1657         if (!GetUserName(user_name, &len))
1658                 return NULL;
1659         p.pw_name = user_name;
1660         p.pw_gecos = "unknown";
1661         p.pw_dir = NULL;
1662         return &p;
1663 }
1664
1665 static HANDLE timer_event;
1666 static HANDLE timer_thread;
1667 static int timer_interval;
1668 static int one_shot;
1669 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1670
1671 /* The timer works like this:
1672  * The thread, ticktack(), is a trivial routine that most of the time
1673  * only waits to receive the signal to terminate. The main thread tells
1674  * the thread to terminate by setting the timer_event to the signalled
1675  * state.
1676  * But ticktack() interrupts the wait state after the timer's interval
1677  * length to call the signal handler.
1678  */
1679
1680 static unsigned __stdcall ticktack(void *dummy)
1681 {
1682         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1683                 mingw_raise(SIGALRM);
1684                 if (one_shot)
1685                         break;
1686         }
1687         return 0;
1688 }
1689
1690 static int start_timer_thread(void)
1691 {
1692         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1693         if (timer_event) {
1694                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1695                 if (!timer_thread )
1696                         return errno = ENOMEM,
1697                                 error("cannot start timer thread");
1698         } else
1699                 return errno = ENOMEM,
1700                         error("cannot allocate resources for timer");
1701         return 0;
1702 }
1703
1704 static void stop_timer_thread(void)
1705 {
1706         if (timer_event)
1707                 SetEvent(timer_event);  /* tell thread to terminate */
1708         if (timer_thread) {
1709                 int rc = WaitForSingleObject(timer_thread, 1000);
1710                 if (rc == WAIT_TIMEOUT)
1711                         error("timer thread did not terminate timely");
1712                 else if (rc != WAIT_OBJECT_0)
1713                         error("waiting for timer thread failed: %lu",
1714                               GetLastError());
1715                 CloseHandle(timer_thread);
1716         }
1717         if (timer_event)
1718                 CloseHandle(timer_event);
1719         timer_event = NULL;
1720         timer_thread = NULL;
1721 }
1722
1723 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1724 {
1725         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1726 }
1727
1728 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1729 {
1730         static const struct timeval zero;
1731         static int atexit_done;
1732
1733         if (out != NULL)
1734                 return errno = EINVAL,
1735                         error("setitimer param 3 != NULL not implemented");
1736         if (!is_timeval_eq(&in->it_interval, &zero) &&
1737             !is_timeval_eq(&in->it_interval, &in->it_value))
1738                 return errno = EINVAL,
1739                         error("setitimer: it_interval must be zero or eq it_value");
1740
1741         if (timer_thread)
1742                 stop_timer_thread();
1743
1744         if (is_timeval_eq(&in->it_value, &zero) &&
1745             is_timeval_eq(&in->it_interval, &zero))
1746                 return 0;
1747
1748         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1749         one_shot = is_timeval_eq(&in->it_interval, &zero);
1750         if (!atexit_done) {
1751                 atexit(stop_timer_thread);
1752                 atexit_done = 1;
1753         }
1754         return start_timer_thread();
1755 }
1756
1757 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1758 {
1759         if (sig != SIGALRM)
1760                 return errno = EINVAL,
1761                         error("sigaction only implemented for SIGALRM");
1762         if (out != NULL)
1763                 return errno = EINVAL,
1764                         error("sigaction: param 3 != NULL not implemented");
1765
1766         timer_fn = in->sa_handler;
1767         return 0;
1768 }
1769
1770 #undef signal
1771 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1772 {
1773         sig_handler_t old;
1774
1775         switch (sig) {
1776         case SIGALRM:
1777                 old = timer_fn;
1778                 timer_fn = handler;
1779                 break;
1780
1781         case SIGINT:
1782                 old = sigint_fn;
1783                 sigint_fn = handler;
1784                 break;
1785
1786         default:
1787                 return signal(sig, handler);
1788         }
1789
1790         return old;
1791 }
1792
1793 #undef raise
1794 int mingw_raise(int sig)
1795 {
1796         switch (sig) {
1797         case SIGALRM:
1798                 if (timer_fn == SIG_DFL) {
1799                         if (isatty(STDERR_FILENO))
1800                                 fputs("Alarm clock\n", stderr);
1801                         exit(128 + SIGALRM);
1802                 } else if (timer_fn != SIG_IGN)
1803                         timer_fn(SIGALRM);
1804                 return 0;
1805
1806         case SIGINT:
1807                 if (sigint_fn == SIG_DFL)
1808                         exit(128 + SIGINT);
1809                 else if (sigint_fn != SIG_IGN)
1810                         sigint_fn(SIGINT);
1811                 return 0;
1812
1813         default:
1814                 return raise(sig);
1815         }
1816 }
1817
1818
1819 static const char *make_backslash_path(const char *path)
1820 {
1821         static char buf[PATH_MAX + 1];
1822         char *c;
1823
1824         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1825                 die("Too long path: %.*s", 60, path);
1826
1827         for (c = buf; *c; c++) {
1828                 if (*c == '/')
1829                         *c = '\\';
1830         }
1831         return buf;
1832 }
1833
1834 void mingw_open_html(const char *unixpath)
1835 {
1836         const char *htmlpath = make_backslash_path(unixpath);
1837         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1838                         const char *, const char *, const char *, INT);
1839         T ShellExecute;
1840         HMODULE shell32;
1841         int r;
1842
1843         shell32 = LoadLibrary("shell32.dll");
1844         if (!shell32)
1845                 die("cannot load shell32.dll");
1846         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1847         if (!ShellExecute)
1848                 die("cannot run browser");
1849
1850         printf("Launching default browser to display HTML ...\n");
1851         r = HCAST(int, ShellExecute(NULL, "open", htmlpath,
1852                                 NULL, "\\", SW_SHOWNORMAL));
1853         FreeLibrary(shell32);
1854         /* see the MSDN documentation referring to the result codes here */
1855         if (r <= 32) {
1856                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1857         }
1858 }
1859
1860 int link(const char *oldpath, const char *newpath)
1861 {
1862         typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1863         static T create_hard_link = NULL;
1864         wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1865         if (xutftowcs_path(woldpath, oldpath) < 0 ||
1866                 xutftowcs_path(wnewpath, newpath) < 0)
1867                 return -1;
1868
1869         if (!create_hard_link) {
1870                 create_hard_link = (T) GetProcAddress(
1871                         GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1872                 if (!create_hard_link)
1873                         create_hard_link = (T)-1;
1874         }
1875         if (create_hard_link == (T)-1) {
1876                 errno = ENOSYS;
1877                 return -1;
1878         }
1879         if (!create_hard_link(wnewpath, woldpath, NULL)) {
1880                 errno = err_win_to_posix(GetLastError());
1881                 return -1;
1882         }
1883         return 0;
1884 }
1885
1886 pid_t waitpid(pid_t pid, int *status, int options)
1887 {
1888         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1889             FALSE, pid);
1890         if (!h) {
1891                 errno = ECHILD;
1892                 return -1;
1893         }
1894
1895         if (pid > 0 && options & WNOHANG) {
1896                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1897                         CloseHandle(h);
1898                         return 0;
1899                 }
1900                 options &= ~WNOHANG;
1901         }
1902
1903         if (options == 0) {
1904                 struct pinfo_t **ppinfo;
1905                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1906                         CloseHandle(h);
1907                         return 0;
1908                 }
1909
1910                 if (status)
1911                         GetExitCodeProcess(h, (LPDWORD)status);
1912
1913                 EnterCriticalSection(&pinfo_cs);
1914
1915                 ppinfo = &pinfo;
1916                 while (*ppinfo) {
1917                         struct pinfo_t *info = *ppinfo;
1918                         if (info->pid == pid) {
1919                                 CloseHandle(info->proc);
1920                                 *ppinfo = info->next;
1921                                 free(info);
1922                                 break;
1923                         }
1924                         ppinfo = &info->next;
1925                 }
1926
1927                 LeaveCriticalSection(&pinfo_cs);
1928
1929                 CloseHandle(h);
1930                 return pid;
1931         }
1932         CloseHandle(h);
1933
1934         errno = EINVAL;
1935         return -1;
1936 }
1937
1938 int mingw_offset_1st_component(const char *path)
1939 {
1940         int offset = 0;
1941         if (has_dos_drive_prefix(path))
1942                 offset = 2;
1943
1944         /* unc paths */
1945         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1946
1947                 /* skip server name */
1948                 char *pos = strpbrk(path + 2, "\\/");
1949                 if (!pos)
1950                         return 0; /* Error: malformed unc path */
1951
1952                 do {
1953                         pos++;
1954                 } while (*pos && !is_dir_sep(*pos));
1955
1956                 offset = pos - path;
1957         }
1958
1959         return offset + is_dir_sep(path[offset]);
1960 }
1961
1962 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1963 {
1964         int upos = 0, wpos = 0;
1965         const unsigned char *utf = (const unsigned char*) utfs;
1966         if (!utf || !wcs || wcslen < 1) {
1967                 errno = EINVAL;
1968                 return -1;
1969         }
1970         /* reserve space for \0 */
1971         wcslen--;
1972         if (utflen < 0)
1973                 utflen = INT_MAX;
1974
1975         while (upos < utflen) {
1976                 int c = utf[upos++] & 0xff;
1977                 if (utflen == INT_MAX && c == 0)
1978                         break;
1979
1980                 if (wpos >= wcslen) {
1981                         wcs[wpos] = 0;
1982                         errno = ERANGE;
1983                         return -1;
1984                 }
1985
1986                 if (c < 0x80) {
1987                         /* ASCII */
1988                         wcs[wpos++] = c;
1989                 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
1990                                 (utf[upos] & 0xc0) == 0x80) {
1991                         /* 2-byte utf-8 */
1992                         c = ((c & 0x1f) << 6);
1993                         c |= (utf[upos++] & 0x3f);
1994                         wcs[wpos++] = c;
1995                 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
1996                                 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
1997                                 (utf[upos] & 0xc0) == 0x80 &&
1998                                 (utf[upos + 1] & 0xc0) == 0x80) {
1999                         /* 3-byte utf-8 */
2000                         c = ((c & 0x0f) << 12);
2001                         c |= ((utf[upos++] & 0x3f) << 6);
2002                         c |= (utf[upos++] & 0x3f);
2003                         wcs[wpos++] = c;
2004                 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2005                                 wpos + 1 < wcslen &&
2006                                 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2007                                 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2008                                 (utf[upos] & 0xc0) == 0x80 &&
2009                                 (utf[upos + 1] & 0xc0) == 0x80 &&
2010                                 (utf[upos + 2] & 0xc0) == 0x80) {
2011                         /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2012                         c = ((c & 0x07) << 18);
2013                         c |= ((utf[upos++] & 0x3f) << 12);
2014                         c |= ((utf[upos++] & 0x3f) << 6);
2015                         c |= (utf[upos++] & 0x3f);
2016                         c -= 0x10000;
2017                         wcs[wpos++] = 0xd800 | (c >> 10);
2018                         wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2019                 } else if (c >= 0xa0) {
2020                         /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2021                         wcs[wpos++] = c;
2022                 } else {
2023                         /* invalid utf-8 byte, non-printable unicode: convert to hex */
2024                         static const char *hex = "0123456789abcdef";
2025                         wcs[wpos++] = hex[c >> 4];
2026                         if (wpos < wcslen)
2027                                 wcs[wpos++] = hex[c & 0x0f];
2028                 }
2029         }
2030         wcs[wpos] = 0;
2031         return wpos;
2032 }
2033
2034 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2035 {
2036         if (!wcs || !utf || utflen < 1) {
2037                 errno = EINVAL;
2038                 return -1;
2039         }
2040         utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2041         if (utflen)
2042                 return utflen - 1;
2043         errno = ERANGE;
2044         return -1;
2045 }
2046
2047 static void setup_windows_environment()
2048 {
2049         /* on Windows it is TMP and TEMP */
2050         if (!getenv("TMPDIR")) {
2051                 const char *tmp = getenv("TMP");
2052                 if (!tmp)
2053                         tmp = getenv("TEMP");
2054                 if (tmp)
2055                         setenv("TMPDIR", tmp, 1);
2056         }
2057
2058         /* simulate TERM to enable auto-color (see color.c) */
2059         if (!getenv("TERM"))
2060                 setenv("TERM", "cygwin", 1);
2061 }
2062
2063 /*
2064  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2065  * mingw startup code, see init.c in mingw runtime).
2066  */
2067 int _CRT_glob = 0;
2068
2069 typedef struct {
2070         int newmode;
2071 } _startupinfo;
2072
2073 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2074                 _startupinfo *si);
2075
2076 static NORETURN void die_startup()
2077 {
2078         fputs("fatal: not enough memory for initialization", stderr);
2079         exit(128);
2080 }
2081
2082 static void *malloc_startup(size_t size)
2083 {
2084         void *result = malloc(size);
2085         if (!result)
2086                 die_startup();
2087         return result;
2088 }
2089
2090 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2091 {
2092         len = xwcstoutf(buffer, wcs, len) + 1;
2093         return memcpy(malloc_startup(len), buffer, len);
2094 }
2095
2096 void mingw_startup()
2097 {
2098         int i, maxlen, argc;
2099         char *buffer;
2100         wchar_t **wenv, **wargv;
2101         _startupinfo si;
2102
2103         /* get wide char arguments and environment */
2104         si.newmode = 0;
2105         if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2106                 die_startup();
2107
2108         /* determine size of argv and environ conversion buffer */
2109         maxlen = wcslen(_wpgmptr);
2110         for (i = 1; i < argc; i++)
2111                 maxlen = max(maxlen, wcslen(wargv[i]));
2112         for (i = 0; wenv[i]; i++)
2113                 maxlen = max(maxlen, wcslen(wenv[i]));
2114
2115         /*
2116          * nedmalloc can't free CRT memory, allocate resizable environment
2117          * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2118          * use it while initializing the environment itself.
2119          */
2120         environ_size = i + 1;
2121         environ_alloc = alloc_nr(environ_size * sizeof(char*));
2122         environ = malloc_startup(environ_alloc);
2123
2124         /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2125         maxlen = 3 * maxlen + 1;
2126         buffer = malloc_startup(maxlen);
2127
2128         /* convert command line arguments and environment to UTF-8 */
2129         __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2130         for (i = 1; i < argc; i++)
2131                 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2132         for (i = 0; wenv[i]; i++)
2133                 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2134         environ[i] = NULL;
2135         free(buffer);
2136
2137         /* sort environment for O(log n) getenv / putenv */
2138         qsort(environ, i, sizeof(char*), compareenv);
2139
2140         /* fix Windows specific environment settings */
2141         setup_windows_environment();
2142
2143         /* initialize critical section for waitpid pinfo_t list */
2144         InitializeCriticalSection(&pinfo_cs);
2145
2146         /* set up default file mode and file modes for stdin/out/err */
2147         _fmode = _O_BINARY;
2148         _setmode(_fileno(stdin), _O_BINARY);
2149         _setmode(_fileno(stdout), _O_BINARY);
2150         _setmode(_fileno(stderr), _O_BINARY);
2151
2152         /* initialize Unicode console */
2153         winansi_init();
2154 }
2155
2156 int uname(struct utsname *buf)
2157 {
2158         unsigned v = (unsigned)GetVersion();
2159         memset(buf, 0, sizeof(*buf));
2160         xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2161         xsnprintf(buf->release, sizeof(buf->release),
2162                  "%u.%u", v & 0xff, (v >> 8) & 0xff);
2163         /* assuming NT variants only.. */
2164         xsnprintf(buf->version, sizeof(buf->version),
2165                   "%u", (v >> 16) & 0x7fff);
2166         return 0;
2167 }