Andrew's git - gitweb.git/blob

   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
   9static const int delay[] = { 0, 1, 10, 20, 40 };
  10
  11int err_win_to_posix(DWORD winerr)
  12{
  13        int error = ENOSYS;
  14        switch(winerr) {
  15        case ERROR_ACCESS_DENIED: error = EACCES; break;
  16        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  17        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  18        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  19        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  20        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  21        case ERROR_BAD_COMMAND: error = EIO; break;
  22        case ERROR_BAD_DEVICE: error = ENODEV; break;
  23        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  24        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  25        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  26        case ERROR_BAD_LENGTH: error = EINVAL; break;
  27        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  28        case ERROR_BAD_PIPE: error = EPIPE; break;
  29        case ERROR_BAD_UNIT: error = ENODEV; break;
  30        case ERROR_BAD_USERNAME: error = EINVAL; break;
  31        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  32        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  33        case ERROR_BUSY: error = EBUSY; break;
  34        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  35        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  36        case ERROR_CANNOT_MAKE: error = EACCES; break;
  37        case ERROR_CANTOPEN: error = EIO; break;
  38        case ERROR_CANTREAD: error = EIO; break;
  39        case ERROR_CANTWRITE: error = EIO; break;
  40        case ERROR_CRC: error = EIO; break;
  41        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  42        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  43        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  44        case ERROR_DIRECTORY: error = EINVAL; break;
  45        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  46        case ERROR_DISK_CHANGE: error = EIO; break;
  47        case ERROR_DISK_FULL: error = ENOSPC; break;
  48        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  49        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  50        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  51        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  52        case ERROR_FILE_EXISTS: error = EEXIST; break;
  53        case ERROR_FILE_INVALID: error = ENODEV; break;
  54        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  55        case ERROR_GEN_FAILURE: error = EIO; break;
  56        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  57        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  58        case ERROR_INVALID_ACCESS: error = EACCES; break;
  59        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  60        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  61        case ERROR_INVALID_DATA: error = EINVAL; break;
  62        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  63        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  64        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  65        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  66        case ERROR_INVALID_HANDLE: error = EBADF; break;
  67        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  68        case ERROR_INVALID_NAME: error = EINVAL; break;
  69        case ERROR_INVALID_OWNER: error = EINVAL; break;
  70        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  71        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  72        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  73        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  74        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  75        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  76        case ERROR_IO_DEVICE: error = EIO; break;
  77        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  78        case ERROR_LOCKED: error = EBUSY; break;
  79        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  80        case ERROR_LOGON_FAILURE: error = EACCES; break;
  81        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  82        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  83        case ERROR_MORE_DATA: error = EPIPE; break;
  84        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  85        case ERROR_NOACCESS: error = EFAULT; break;
  86        case ERROR_NONE_MAPPED: error = EINVAL; break;
  87        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  88        case ERROR_NOT_READY: error = EAGAIN; break;
  89        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  90        case ERROR_NO_DATA: error = EPIPE; break;
  91        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  92        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  93        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  94        case ERROR_OPEN_FAILED: error = EIO; break;
  95        case ERROR_OPEN_FILES: error = EBUSY; break;
  96        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  97        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  98        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  99        case ERROR_PATH_BUSY: error = EBUSY; break;
 100        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 101        case ERROR_PIPE_BUSY: error = EBUSY; break;
 102        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 103        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 104        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 105        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 106        case ERROR_READ_FAULT: error = EIO; break;
 107        case ERROR_SEEK: error = EIO; break;
 108        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 109        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 110        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 111        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 112        case ERROR_SWAPERROR: error = ENOENT; break;
 113        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 114        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 115        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 116        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 117        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 118        case ERROR_WRITE_FAULT: error = EIO; break;
 119        case ERROR_WRITE_PROTECT: error = EROFS; break;
 120        }
 121        return error;
 122}
 123
 124static inline int is_file_in_use_error(DWORD errcode)
 125{
 126        switch (errcode) {
 127        case ERROR_SHARING_VIOLATION:
 128        case ERROR_ACCESS_DENIED:
 129                return 1;
 130        }
 131
 132        return 0;
 133}
 134
 135static int read_yes_no_answer(void)
 136{
 137        char answer[1024];
 138
 139        if (fgets(answer, sizeof(answer), stdin)) {
 140                size_t answer_len = strlen(answer);
 141                int got_full_line = 0, c;
 142
 143                /* remove the newline */
 144                if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 145                        answer[answer_len-2] = '\0';
 146                        got_full_line = 1;
 147                } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 148                        answer[answer_len-1] = '\0';
 149                        got_full_line = 1;
 150                }
 151                /* flush the buffer in case we did not get the full line */
 152                if (!got_full_line)
 153                        while ((c = getchar()) != EOF && c != '\n')
 154                                ;
 155        } else
 156                /* we could not read, return the
 157                 * default answer which is no */
 158                return 0;
 159
 160        if (tolower(answer[0]) == 'y' && !answer[1])
 161                return 1;
 162        if (!strncasecmp(answer, "yes", sizeof(answer)))
 163                return 1;
 164        if (tolower(answer[0]) == 'n' && !answer[1])
 165                return 0;
 166        if (!strncasecmp(answer, "no", sizeof(answer)))
 167                return 0;
 168
 169        /* did not find an answer we understand */
 170        return -1;
 171}
 172
 173static int ask_yes_no_if_possible(const char *format, ...)
 174{
 175        char question[4096];
 176        const char *retry_hook[] = { NULL, NULL, NULL };
 177        va_list args;
 178
 179        va_start(args, format);
 180        vsnprintf(question, sizeof(question), format, args);
 181        va_end(args);
 182
 183        if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 184                retry_hook[1] = question;
 185                return !run_command_v_opt(retry_hook, 0);
 186        }
 187
 188        if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 189                return 0;
 190
 191        while (1) {
 192                int answer;
 193                fprintf(stderr, "%s (y/n) ", question);
 194
 195                if ((answer = read_yes_no_answer()) >= 0)
 196                        return answer;
 197
 198                fprintf(stderr, "Sorry, I did not understand your answer. "
 199                                "Please type 'y' or 'n'\n");
 200        }
 201}
 202
 203int mingw_unlink(const char *pathname)
 204{
 205        int ret, tries = 0;
 206        wchar_t wpathname[MAX_PATH];
 207        if (xutftowcs_path(wpathname, pathname) < 0)
 208                return -1;
 209
 210        /* read-only files cannot be removed */
 211        _wchmod(wpathname, 0666);
 212        while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 213                if (!is_file_in_use_error(GetLastError()))
 214                        break;
 215                /*
 216                 * We assume that some other process had the source or
 217                 * destination file open at the wrong moment and retry.
 218                 * In order to give the other process a higher chance to
 219                 * complete its operation, we give up our time slice now.
 220                 * If we have to retry again, we do sleep a bit.
 221                 */
 222                Sleep(delay[tries]);
 223                tries++;
 224        }
 225        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 226               ask_yes_no_if_possible("Unlink of file '%s' failed. "
 227                        "Should I try again?", pathname))
 228               ret = _wunlink(wpathname);
 229        return ret;
 230}
 231
 232static int is_dir_empty(const wchar_t *wpath)
 233{
 234        WIN32_FIND_DATAW findbuf;
 235        HANDLE handle;
 236        wchar_t wbuf[MAX_PATH + 2];
 237        wcscpy(wbuf, wpath);
 238        wcscat(wbuf, L"\\*");
 239        handle = FindFirstFileW(wbuf, &findbuf);
 240        if (handle == INVALID_HANDLE_VALUE)
 241                return GetLastError() == ERROR_NO_MORE_FILES;
 242
 243        while (!wcscmp(findbuf.cFileName, L".") ||
 244                        !wcscmp(findbuf.cFileName, L".."))
 245                if (!FindNextFileW(handle, &findbuf)) {
 246                        DWORD err = GetLastError();
 247                        FindClose(handle);
 248                        return err == ERROR_NO_MORE_FILES;
 249                }
 250        FindClose(handle);
 251        return 0;
 252}
 253
 254int mingw_rmdir(const char *pathname)
 255{
 256        int ret, tries = 0;
 257        wchar_t wpathname[MAX_PATH];
 258        if (xutftowcs_path(wpathname, pathname) < 0)
 259                return -1;
 260
 261        while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 262                if (!is_file_in_use_error(GetLastError()))
 263                        errno = err_win_to_posix(GetLastError());
 264                if (errno != EACCES)
 265                        break;
 266                if (!is_dir_empty(wpathname)) {
 267                        errno = ENOTEMPTY;
 268                        break;
 269                }
 270                /*
 271                 * We assume that some other process had the source or
 272                 * destination file open at the wrong moment and retry.
 273                 * In order to give the other process a higher chance to
 274                 * complete its operation, we give up our time slice now.
 275                 * If we have to retry again, we do sleep a bit.
 276                 */
 277                Sleep(delay[tries]);
 278                tries++;
 279        }
 280        while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 281               ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 282                        "Should I try again?", pathname))
 283               ret = _wrmdir(wpathname);
 284        return ret;
 285}
 286
 287int mingw_mkdir(const char *path, int mode)
 288{
 289        int ret;
 290        wchar_t wpath[MAX_PATH];
 291        if (xutftowcs_path(wpath, path) < 0)
 292                return -1;
 293        ret = _wmkdir(wpath);
 294        return ret;
 295}
 296
 297int mingw_open (const char *filename, int oflags, ...)
 298{
 299        va_list args;
 300        unsigned mode;
 301        int fd;
 302        wchar_t wfilename[MAX_PATH];
 303
 304        va_start(args, oflags);
 305        mode = va_arg(args, int);
 306        va_end(args);
 307
 308        if (filename && !strcmp(filename, "/dev/null"))
 309                filename = "nul";
 310
 311        if (xutftowcs_path(wfilename, filename) < 0)
 312                return -1;
 313        fd = _wopen(wfilename, oflags, mode);
 314
 315        if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 316                DWORD attrs = GetFileAttributesW(wfilename);
 317                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 318                        errno = EISDIR;
 319        }
 320        return fd;
 321}
 322
 323static BOOL WINAPI ctrl_ignore(DWORD type)
 324{
 325        return TRUE;
 326}
 327
 328#undef fgetc
 329int mingw_fgetc(FILE *stream)
 330{
 331        int ch;
 332        if (!isatty(_fileno(stream)))
 333                return fgetc(stream);
 334
 335        SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 336        while (1) {
 337                ch = fgetc(stream);
 338                if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 339                        break;
 340
 341                /* Ctrl+C was pressed, simulate SIGINT and retry */
 342                mingw_raise(SIGINT);
 343        }
 344        SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 345        return ch;
 346}
 347
 348#undef fopen
 349FILE *mingw_fopen (const char *filename, const char *otype)
 350{
 351        FILE *file;
 352        wchar_t wfilename[MAX_PATH], wotype[4];
 353        if (filename && !strcmp(filename, "/dev/null"))
 354                filename = "nul";
 355        if (xutftowcs_path(wfilename, filename) < 0 ||
 356                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 357                return NULL;
 358        file = _wfopen(wfilename, wotype);
 359        return file;
 360}
 361
 362FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 363{
 364        FILE *file;
 365        wchar_t wfilename[MAX_PATH], wotype[4];
 366        if (filename && !strcmp(filename, "/dev/null"))
 367                filename = "nul";
 368        if (xutftowcs_path(wfilename, filename) < 0 ||
 369                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 370                return NULL;
 371        file = _wfreopen(wfilename, wotype, stream);
 372        return file;
 373}
 374
 375#undef fflush
 376int mingw_fflush(FILE *stream)
 377{
 378        int ret = fflush(stream);
 379
 380        /*
 381         * write() is used behind the scenes of stdio output functions.
 382         * Since git code does not check for errors after each stdio write
 383         * operation, it can happen that write() is called by a later
 384         * stdio function even if an earlier write() call failed. In the
 385         * case of a pipe whose readable end was closed, only the first
 386         * call to write() reports EPIPE on Windows. Subsequent write()
 387         * calls report EINVAL. It is impossible to notice whether this
 388         * fflush invocation triggered such a case, therefore, we have to
 389         * catch all EINVAL errors whole-sale.
 390         */
 391        if (ret && errno == EINVAL)
 392                errno = EPIPE;
 393
 394        return ret;
 395}
 396
 397#undef write
 398ssize_t mingw_write(int fd, const void *buf, size_t len)
 399{
 400        ssize_t result = write(fd, buf, len);
 401
 402        if (result < 0 && errno == EINVAL && buf) {
 403                /* check if fd is a pipe */
 404                HANDLE h = (HANDLE) _get_osfhandle(fd);
 405                if (GetFileType(h) == FILE_TYPE_PIPE)
 406                        errno = EPIPE;
 407                else
 408                        errno = EINVAL;
 409        }
 410
 411        return result;
 412}
 413
 414int mingw_access(const char *filename, int mode)
 415{
 416        wchar_t wfilename[MAX_PATH];
 417        if (xutftowcs_path(wfilename, filename) < 0)
 418                return -1;
 419        /* X_OK is not supported by the MSVCRT version */
 420        return _waccess(wfilename, mode & ~X_OK);
 421}
 422
 423int mingw_chdir(const char *dirname)
 424{
 425        wchar_t wdirname[MAX_PATH];
 426        if (xutftowcs_path(wdirname, dirname) < 0)
 427                return -1;
 428        return _wchdir(wdirname);
 429}
 430
 431int mingw_chmod(const char *filename, int mode)
 432{
 433        wchar_t wfilename[MAX_PATH];
 434        if (xutftowcs_path(wfilename, filename) < 0)
 435                return -1;
 436        return _wchmod(wfilename, mode);
 437}
 438
 439/*
 440 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 441 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 442 */
 443static inline long long filetime_to_hnsec(const FILETIME *ft)
 444{
 445        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 446        /* Windows to Unix Epoch conversion */
 447        return winTime - 116444736000000000LL;
 448}
 449
 450static inline time_t filetime_to_time_t(const FILETIME *ft)
 451{
 452        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 453}
 454
 455/* We keep the do_lstat code in a separate function to avoid recursion.
 456 * When a path ends with a slash, the stat will fail with ENOENT. In
 457 * this case, we strip the trailing slashes and stat again.
 458 *
 459 * If follow is true then act like stat() and report on the link
 460 * target. Otherwise report on the link itself.
 461 */
 462static int do_lstat(int follow, const char *file_name, struct stat *buf)
 463{
 464        WIN32_FILE_ATTRIBUTE_DATA fdata;
 465        wchar_t wfilename[MAX_PATH];
 466        if (xutftowcs_path(wfilename, file_name) < 0)
 467                return -1;
 468
 469        if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 470                buf->st_ino = 0;
 471                buf->st_gid = 0;
 472                buf->st_uid = 0;
 473                buf->st_nlink = 1;
 474                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 475                buf->st_size = fdata.nFileSizeLow |
 476                        (((off_t)fdata.nFileSizeHigh)<<32);
 477                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 478                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 479                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 480                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 481                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 482                        WIN32_FIND_DATAW findbuf;
 483                        HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 484                        if (handle != INVALID_HANDLE_VALUE) {
 485                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 486                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 487                                        if (follow) {
 488                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 489                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 490                                        } else {
 491                                                buf->st_mode = S_IFLNK;
 492                                        }
 493                                        buf->st_mode |= S_IREAD;
 494                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 495                                                buf->st_mode |= S_IWRITE;
 496                                }
 497                                FindClose(handle);
 498                        }
 499                }
 500                return 0;
 501        }
 502        switch (GetLastError()) {
 503        case ERROR_ACCESS_DENIED:
 504        case ERROR_SHARING_VIOLATION:
 505        case ERROR_LOCK_VIOLATION:
 506        case ERROR_SHARING_BUFFER_EXCEEDED:
 507                errno = EACCES;
 508                break;
 509        case ERROR_BUFFER_OVERFLOW:
 510                errno = ENAMETOOLONG;
 511                break;
 512        case ERROR_NOT_ENOUGH_MEMORY:
 513                errno = ENOMEM;
 514                break;
 515        default:
 516                errno = ENOENT;
 517                break;
 518        }
 519        return -1;
 520}
 521
 522/* We provide our own lstat/fstat functions, since the provided
 523 * lstat/fstat functions are so slow. These stat functions are
 524 * tailored for Git's usage (read: fast), and are not meant to be
 525 * complete. Note that Git stat()s are redirected to mingw_lstat()
 526 * too, since Windows doesn't really handle symlinks that well.
 527 */
 528static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 529{
 530        int namelen;
 531        char alt_name[PATH_MAX];
 532
 533        if (!do_lstat(follow, file_name, buf))
 534                return 0;
 535
 536        /* if file_name ended in a '/', Windows returned ENOENT;
 537         * try again without trailing slashes
 538         */
 539        if (errno != ENOENT)
 540                return -1;
 541
 542        namelen = strlen(file_name);
 543        if (namelen && file_name[namelen-1] != '/')
 544                return -1;
 545        while (namelen && file_name[namelen-1] == '/')
 546                --namelen;
 547        if (!namelen || namelen >= PATH_MAX)
 548                return -1;
 549
 550        memcpy(alt_name, file_name, namelen);
 551        alt_name[namelen] = 0;
 552        return do_lstat(follow, alt_name, buf);
 553}
 554
 555int mingw_lstat(const char *file_name, struct stat *buf)
 556{
 557        return do_stat_internal(0, file_name, buf);
 558}
 559int mingw_stat(const char *file_name, struct stat *buf)
 560{
 561        return do_stat_internal(1, file_name, buf);
 562}
 563
 564int mingw_fstat(int fd, struct stat *buf)
 565{
 566        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 567        BY_HANDLE_FILE_INFORMATION fdata;
 568
 569        if (fh == INVALID_HANDLE_VALUE) {
 570                errno = EBADF;
 571                return -1;
 572        }
 573        /* direct non-file handles to MS's fstat() */
 574        if (GetFileType(fh) != FILE_TYPE_DISK)
 575                return _fstati64(fd, buf);
 576
 577        if (GetFileInformationByHandle(fh, &fdata)) {
 578                buf->st_ino = 0;
 579                buf->st_gid = 0;
 580                buf->st_uid = 0;
 581                buf->st_nlink = 1;
 582                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 583                buf->st_size = fdata.nFileSizeLow |
 584                        (((off_t)fdata.nFileSizeHigh)<<32);
 585                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 586                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 587                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 588                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 589                return 0;
 590        }
 591        errno = EBADF;
 592        return -1;
 593}
 594
 595static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 596{
 597        long long winTime = t * 10000000LL + 116444736000000000LL;
 598        ft->dwLowDateTime = winTime;
 599        ft->dwHighDateTime = winTime >> 32;
 600}
 601
 602int mingw_utime (const char *file_name, const struct utimbuf *times)
 603{
 604        FILETIME mft, aft;
 605        int fh, rc;
 606        DWORD attrs;
 607        wchar_t wfilename[MAX_PATH];
 608        if (xutftowcs_path(wfilename, file_name) < 0)
 609                return -1;
 610
 611        /* must have write permission */
 612        attrs = GetFileAttributesW(wfilename);
 613        if (attrs != INVALID_FILE_ATTRIBUTES &&
 614            (attrs & FILE_ATTRIBUTE_READONLY)) {
 615                /* ignore errors here; open() will report them */
 616                SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 617        }
 618
 619        if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 620                rc = -1;
 621                goto revert_attrs;
 622        }
 623
 624        if (times) {
 625                time_t_to_filetime(times->modtime, &mft);
 626                time_t_to_filetime(times->actime, &aft);
 627        } else {
 628                GetSystemTimeAsFileTime(&mft);
 629                aft = mft;
 630        }
 631        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 632                errno = EINVAL;
 633                rc = -1;
 634        } else
 635                rc = 0;
 636        close(fh);
 637
 638revert_attrs:
 639        if (attrs != INVALID_FILE_ATTRIBUTES &&
 640            (attrs & FILE_ATTRIBUTE_READONLY)) {
 641                /* ignore errors again */
 642                SetFileAttributesW(wfilename, attrs);
 643        }
 644        return rc;
 645}
 646
 647unsigned int sleep (unsigned int seconds)
 648{
 649        Sleep(seconds*1000);
 650        return 0;
 651}
 652
 653char *mingw_mktemp(char *template)
 654{
 655        wchar_t wtemplate[MAX_PATH];
 656        if (xutftowcs_path(wtemplate, template) < 0)
 657                return NULL;
 658        if (!_wmktemp(wtemplate))
 659                return NULL;
 660        if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 661                return NULL;
 662        return template;
 663}
 664
 665int mkstemp(char *template)
 666{
 667        char *filename = mktemp(template);
 668        if (filename == NULL)
 669                return -1;
 670        return open(filename, O_RDWR | O_CREAT, 0600);
 671}
 672
 673int gettimeofday(struct timeval *tv, void *tz)
 674{
 675        FILETIME ft;
 676        long long hnsec;
 677
 678        GetSystemTimeAsFileTime(&ft);
 679        hnsec = filetime_to_hnsec(&ft);
 680        tv->tv_sec = hnsec / 10000000;
 681        tv->tv_usec = (hnsec % 10000000) / 10;
 682        return 0;
 683}
 684
 685int pipe(int filedes[2])
 686{
 687        HANDLE h[2];
 688
 689        /* this creates non-inheritable handles */
 690        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 691                errno = err_win_to_posix(GetLastError());
 692                return -1;
 693        }
 694        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 695        if (filedes[0] < 0) {
 696                CloseHandle(h[0]);
 697                CloseHandle(h[1]);
 698                return -1;
 699        }
 700        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 701        if (filedes[1] < 0) {
 702                close(filedes[0]);
 703                CloseHandle(h[1]);
 704                return -1;
 705        }
 706        return 0;
 707}
 708
 709struct tm *gmtime_r(const time_t *timep, struct tm *result)
 710{
 711        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 712        memcpy(result, gmtime(timep), sizeof(struct tm));
 713        return result;
 714}
 715
 716struct tm *localtime_r(const time_t *timep, struct tm *result)
 717{
 718        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 719        memcpy(result, localtime(timep), sizeof(struct tm));
 720        return result;
 721}
 722
 723char *mingw_getcwd(char *pointer, int len)
 724{
 725        int i;
 726        wchar_t wpointer[MAX_PATH];
 727        if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 728                return NULL;
 729        if (xwcstoutf(pointer, wpointer, len) < 0)
 730                return NULL;
 731        for (i = 0; pointer[i]; i++)
 732                if (pointer[i] == '\\')
 733                        pointer[i] = '/';
 734        return pointer;
 735}
 736
 737/*
 738 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 739 * (Parsing C++ Command-Line Arguments)
 740 */
 741static const char *quote_arg(const char *arg)
 742{
 743        /* count chars to quote */
 744        int len = 0, n = 0;
 745        int force_quotes = 0;
 746        char *q, *d;
 747        const char *p = arg;
 748        if (!*p) force_quotes = 1;
 749        while (*p) {
 750                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 751                        force_quotes = 1;
 752                else if (*p == '"')
 753                        n++;
 754                else if (*p == '\\') {
 755                        int count = 0;
 756                        while (*p == '\\') {
 757                                count++;
 758                                p++;
 759                                len++;
 760                        }
 761                        if (*p == '"')
 762                                n += count*2 + 1;
 763                        continue;
 764                }
 765                len++;
 766                p++;
 767        }
 768        if (!force_quotes && n == 0)
 769                return arg;
 770
 771        /* insert \ where necessary */
 772        d = q = xmalloc(st_add3(len, n, 3));
 773        *d++ = '"';
 774        while (*arg) {
 775                if (*arg == '"')
 776                        *d++ = '\\';
 777                else if (*arg == '\\') {
 778                        int count = 0;
 779                        while (*arg == '\\') {
 780                                count++;
 781                                *d++ = *arg++;
 782                        }
 783                        if (*arg == '"') {
 784                                while (count-- > 0)
 785                                        *d++ = '\\';
 786                                *d++ = '\\';
 787                        }
 788                }
 789                *d++ = *arg++;
 790        }
 791        *d++ = '"';
 792        *d++ = 0;
 793        return q;
 794}
 795
 796static const char *parse_interpreter(const char *cmd)
 797{
 798        static char buf[100];
 799        char *p, *opt;
 800        int n, fd;
 801
 802        /* don't even try a .exe */
 803        n = strlen(cmd);
 804        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 805                return NULL;
 806
 807        fd = open(cmd, O_RDONLY);
 808        if (fd < 0)
 809                return NULL;
 810        n = read(fd, buf, sizeof(buf)-1);
 811        close(fd);
 812        if (n < 4)      /* at least '#!/x' and not error */
 813                return NULL;
 814
 815        if (buf[0] != '#' || buf[1] != '!')
 816                return NULL;
 817        buf[n] = '\0';
 818        p = buf + strcspn(buf, "\r\n");
 819        if (!*p)
 820                return NULL;
 821
 822        *p = '\0';
 823        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 824                return NULL;
 825        /* strip options */
 826        if ((opt = strchr(p+1, ' ')))
 827                *opt = '\0';
 828        return p+1;
 829}
 830
 831/*
 832 * Splits the PATH into parts.
 833 */
 834static char **get_path_split(void)
 835{
 836        char *p, **path, *envpath = mingw_getenv("PATH");
 837        int i, n = 0;
 838
 839        if (!envpath || !*envpath)
 840                return NULL;
 841
 842        envpath = xstrdup(envpath);
 843        p = envpath;
 844        while (p) {
 845                char *dir = p;
 846                p = strchr(p, ';');
 847                if (p) *p++ = '\0';
 848                if (*dir) {     /* not earlier, catches series of ; */
 849                        ++n;
 850                }
 851        }
 852        if (!n)
 853                return NULL;
 854
 855        ALLOC_ARRAY(path, n + 1);
 856        p = envpath;
 857        i = 0;
 858        do {
 859                if (*p)
 860                        path[i++] = xstrdup(p);
 861                p = p+strlen(p)+1;
 862        } while (i < n);
 863        path[i] = NULL;
 864
 865        free(envpath);
 866
 867        return path;
 868}
 869
 870static void free_path_split(char **path)
 871{
 872        char **p = path;
 873
 874        if (!path)
 875                return;
 876
 877        while (*p)
 878                free(*p++);
 879        free(path);
 880}
 881
 882/*
 883 * exe_only means that we only want to detect .exe files, but not scripts
 884 * (which do not have an extension)
 885 */
 886static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 887{
 888        char path[MAX_PATH];
 889        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 890
 891        if (!isexe && access(path, F_OK) == 0)
 892                return xstrdup(path);
 893        path[strlen(path)-4] = '\0';
 894        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 895                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 896                        return xstrdup(path);
 897        return NULL;
 898}
 899
 900/*
 901 * Determines the absolute path of cmd using the split path in path.
 902 * If cmd contains a slash or backslash, no lookup is performed.
 903 */
 904static char *path_lookup(const char *cmd, char **path, int exe_only)
 905{
 906        char *prog = NULL;
 907        int len = strlen(cmd);
 908        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 909
 910        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 911                prog = xstrdup(cmd);
 912
 913        while (!prog && *path)
 914                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 915
 916        return prog;
 917}
 918
 919static int do_putenv(char **env, const char *name, int size, int free_old);
 920
 921/* used number of elements of environ array, including terminating NULL */
 922static int environ_size = 0;
 923/* allocated size of environ array, in bytes */
 924static int environ_alloc = 0;
 925
 926/*
 927 * Create environment block suitable for CreateProcess. Merges current
 928 * process environment and the supplied environment changes.
 929 */
 930static wchar_t *make_environment_block(char **deltaenv)
 931{
 932        wchar_t *wenvblk = NULL;
 933        char **tmpenv;
 934        int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
 935
 936        while (deltaenv && deltaenv[i])
 937                i++;
 938
 939        /* copy the environment, leaving space for changes */
 940        ALLOC_ARRAY(tmpenv, size + i);
 941        memcpy(tmpenv, environ, size * sizeof(char*));
 942
 943        /* merge supplied environment changes into the temporary environment */
 944        for (i = 0; deltaenv && deltaenv[i]; i++)
 945                size = do_putenv(tmpenv, deltaenv[i], size, 0);
 946
 947        /* create environment block from temporary environment */
 948        for (i = 0; tmpenv[i]; i++) {
 949                size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
 950                ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
 951                wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
 952        }
 953        /* add final \0 terminator */
 954        wenvblk[wenvpos] = 0;
 955        free(tmpenv);
 956        return wenvblk;
 957}
 958
 959struct pinfo_t {
 960        struct pinfo_t *next;
 961        pid_t pid;
 962        HANDLE proc;
 963};
 964static struct pinfo_t *pinfo = NULL;
 965CRITICAL_SECTION pinfo_cs;
 966
 967static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
 968                              const char *dir,
 969                              int prepend_cmd, int fhin, int fhout, int fherr)
 970{
 971        STARTUPINFOW si;
 972        PROCESS_INFORMATION pi;
 973        struct strbuf args;
 974        wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
 975        unsigned flags = CREATE_UNICODE_ENVIRONMENT;
 976        BOOL ret;
 977
 978        /* Determine whether or not we are associated to a console */
 979        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 980                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 981                        FILE_ATTRIBUTE_NORMAL, NULL);
 982        if (cons == INVALID_HANDLE_VALUE) {
 983                /* There is no console associated with this process.
 984                 * Since the child is a console process, Windows
 985                 * would normally create a console window. But
 986                 * since we'll be redirecting std streams, we do
 987                 * not need the console.
 988                 * It is necessary to use DETACHED_PROCESS
 989                 * instead of CREATE_NO_WINDOW to make ssh
 990                 * recognize that it has no console.
 991                 */
 992                flags |= DETACHED_PROCESS;
 993        } else {
 994                /* There is already a console. If we specified
 995                 * DETACHED_PROCESS here, too, Windows would
 996                 * disassociate the child from the console.
 997                 * The same is true for CREATE_NO_WINDOW.
 998                 * Go figure!
 999                 */
1000                CloseHandle(cons);
1001        }
1002        memset(&si, 0, sizeof(si));
1003        si.cb = sizeof(si);
1004        si.dwFlags = STARTF_USESTDHANDLES;
1005        si.hStdInput = winansi_get_osfhandle(fhin);
1006        si.hStdOutput = winansi_get_osfhandle(fhout);
1007        si.hStdError = winansi_get_osfhandle(fherr);
1008
1009        if (xutftowcs_path(wcmd, cmd) < 0)
1010                return -1;
1011        if (dir && xutftowcs_path(wdir, dir) < 0)
1012                return -1;
1013
1014        /* concatenate argv, quoting args as we go */
1015        strbuf_init(&args, 0);
1016        if (prepend_cmd) {
1017                char *quoted = (char *)quote_arg(cmd);
1018                strbuf_addstr(&args, quoted);
1019                if (quoted != cmd)
1020                        free(quoted);
1021        }
1022        for (; *argv; argv++) {
1023                char *quoted = (char *)quote_arg(*argv);
1024                if (*args.buf)
1025                        strbuf_addch(&args, ' ');
1026                strbuf_addstr(&args, quoted);
1027                if (quoted != *argv)
1028                        free(quoted);
1029        }
1030
1031        ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1032        xutftowcs(wargs, args.buf, 2 * args.len + 1);
1033        strbuf_release(&args);
1034
1035        wenvblk = make_environment_block(deltaenv);
1036
1037        memset(&pi, 0, sizeof(pi));
1038        ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1039                wenvblk, dir ? wdir : NULL, &si, &pi);
1040
1041        free(wenvblk);
1042        free(wargs);
1043
1044        if (!ret) {
1045                errno = ENOENT;
1046                return -1;
1047        }
1048        CloseHandle(pi.hThread);
1049
1050        /*
1051         * The process ID is the human-readable identifier of the process
1052         * that we want to present in log and error messages. The handle
1053         * is not useful for this purpose. But we cannot close it, either,
1054         * because it is not possible to turn a process ID into a process
1055         * handle after the process terminated.
1056         * Keep the handle in a list for waitpid.
1057         */
1058        EnterCriticalSection(&pinfo_cs);
1059        {
1060                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1061                info->pid = pi.dwProcessId;
1062                info->proc = pi.hProcess;
1063                info->next = pinfo;
1064                pinfo = info;
1065        }
1066        LeaveCriticalSection(&pinfo_cs);
1067
1068        return (pid_t)pi.dwProcessId;
1069}
1070
1071static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1072{
1073        return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1074}
1075
1076pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1077                     const char *dir,
1078                     int fhin, int fhout, int fherr)
1079{
1080        pid_t pid;
1081        char **path = get_path_split();
1082        char *prog = path_lookup(cmd, path, 0);
1083
1084        if (!prog) {
1085                errno = ENOENT;
1086                pid = -1;
1087        }
1088        else {
1089                const char *interpr = parse_interpreter(prog);
1090
1091                if (interpr) {
1092                        const char *argv0 = argv[0];
1093                        char *iprog = path_lookup(interpr, path, 1);
1094                        argv[0] = prog;
1095                        if (!iprog) {
1096                                errno = ENOENT;
1097                                pid = -1;
1098                        }
1099                        else {
1100                                pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1101                                                       fhin, fhout, fherr);
1102                                free(iprog);
1103                        }
1104                        argv[0] = argv0;
1105                }
1106                else
1107                        pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1108                                               fhin, fhout, fherr);
1109                free(prog);
1110        }
1111        free_path_split(path);
1112        return pid;
1113}
1114
1115static int try_shell_exec(const char *cmd, char *const *argv)
1116{
1117        const char *interpr = parse_interpreter(cmd);
1118        char **path;
1119        char *prog;
1120        int pid = 0;
1121
1122        if (!interpr)
1123                return 0;
1124        path = get_path_split();
1125        prog = path_lookup(interpr, path, 1);
1126        if (prog) {
1127                int argc = 0;
1128                const char **argv2;
1129                while (argv[argc]) argc++;
1130                ALLOC_ARRAY(argv2, argc + 1);
1131                argv2[0] = (char *)cmd; /* full path to the script file */
1132                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1133                pid = mingw_spawnv(prog, argv2, 1);
1134                if (pid >= 0) {
1135                        int status;
1136                        if (waitpid(pid, &status, 0) < 0)
1137                                status = 255;
1138                        exit(status);
1139                }
1140                pid = 1;        /* indicate that we tried but failed */
1141                free(prog);
1142                free(argv2);
1143        }
1144        free_path_split(path);
1145        return pid;
1146}
1147
1148int mingw_execv(const char *cmd, char *const *argv)
1149{
1150        /* check if git_command is a shell script */
1151        if (!try_shell_exec(cmd, argv)) {
1152                int pid, status;
1153
1154                pid = mingw_spawnv(cmd, (const char **)argv, 0);
1155                if (pid < 0)
1156                        return -1;
1157                if (waitpid(pid, &status, 0) < 0)
1158                        status = 255;
1159                exit(status);
1160        }
1161        return -1;
1162}
1163
1164int mingw_execvp(const char *cmd, char *const *argv)
1165{
1166        char **path = get_path_split();
1167        char *prog = path_lookup(cmd, path, 0);
1168
1169        if (prog) {
1170                mingw_execv(prog, argv);
1171                free(prog);
1172        } else
1173                errno = ENOENT;
1174
1175        free_path_split(path);
1176        return -1;
1177}
1178
1179int mingw_kill(pid_t pid, int sig)
1180{
1181        if (pid > 0 && sig == SIGTERM) {
1182                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1183
1184                if (TerminateProcess(h, -1)) {
1185                        CloseHandle(h);
1186                        return 0;
1187                }
1188
1189                errno = err_win_to_posix(GetLastError());
1190                CloseHandle(h);
1191                return -1;
1192        } else if (pid > 0 && sig == 0) {
1193                HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1194                if (h) {
1195                        CloseHandle(h);
1196                        return 0;
1197                }
1198        }
1199
1200        errno = EINVAL;
1201        return -1;
1202}
1203
1204/*
1205 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1206 */
1207static int compareenv(const void *v1, const void *v2)
1208{
1209        const char *e1 = *(const char**)v1;
1210        const char *e2 = *(const char**)v2;
1211
1212        for (;;) {
1213                int c1 = *e1++;
1214                int c2 = *e2++;
1215                c1 = (c1 == '=') ? 0 : tolower(c1);
1216                c2 = (c2 == '=') ? 0 : tolower(c2);
1217                if (c1 > c2)
1218                        return 1;
1219                if (c1 < c2)
1220                        return -1;
1221                if (c1 == 0)
1222                        return 0;
1223        }
1224}
1225
1226static int bsearchenv(char **env, const char *name, size_t size)
1227{
1228        unsigned low = 0, high = size;
1229        while (low < high) {
1230                unsigned mid = low + ((high - low) >> 1);
1231                int cmp = compareenv(&env[mid], &name);
1232                if (cmp < 0)
1233                        low = mid + 1;
1234                else if (cmp > 0)
1235                        high = mid;
1236                else
1237                        return mid;
1238        }
1239        return ~low; /* not found, return 1's complement of insert position */
1240}
1241
1242/*
1243 * If name contains '=', then sets the variable, otherwise it unsets it
1244 * Size includes the terminating NULL. Env must have room for size + 1 entries
1245 * (in case of insert). Returns the new size. Optionally frees removed entries.
1246 */
1247static int do_putenv(char **env, const char *name, int size, int free_old)
1248{
1249        int i = bsearchenv(env, name, size - 1);
1250
1251        /* optionally free removed / replaced entry */
1252        if (i >= 0 && free_old)
1253                free(env[i]);
1254
1255        if (strchr(name, '=')) {
1256                /* if new value ('key=value') is specified, insert or replace entry */
1257                if (i < 0) {
1258                        i = ~i;
1259                        memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1260                        size++;
1261                }
1262                env[i] = (char*) name;
1263        } else if (i >= 0) {
1264                /* otherwise ('key') remove existing entry */
1265                size--;
1266                memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1267        }
1268        return size;
1269}
1270
1271char *mingw_getenv(const char *name)
1272{
1273        char *value;
1274        int pos = bsearchenv(environ, name, environ_size - 1);
1275        if (pos < 0)
1276                return NULL;
1277        value = strchr(environ[pos], '=');
1278        return value ? &value[1] : NULL;
1279}
1280
1281int mingw_putenv(const char *namevalue)
1282{
1283        ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1284        environ_size = do_putenv(environ, namevalue, environ_size, 1);
1285        return 0;
1286}
1287
1288/*
1289 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1290 * that service contains a numerical port, or that it is null. It
1291 * does a simple search using gethostbyname, and returns one IPv4 host
1292 * if one was found.
1293 */
1294static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1295                                   const struct addrinfo *hints,
1296                                   struct addrinfo **res)
1297{
1298        struct hostent *h = NULL;
1299        struct addrinfo *ai;
1300        struct sockaddr_in *sin;
1301
1302        if (node) {
1303                h = gethostbyname(node);
1304                if (!h)
1305                        return WSAGetLastError();
1306        }
1307
1308        ai = xmalloc(sizeof(struct addrinfo));
1309        *res = ai;
1310        ai->ai_flags = 0;
1311        ai->ai_family = AF_INET;
1312        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1313        switch (ai->ai_socktype) {
1314        case SOCK_STREAM:
1315                ai->ai_protocol = IPPROTO_TCP;
1316                break;
1317        case SOCK_DGRAM:
1318                ai->ai_protocol = IPPROTO_UDP;
1319                break;
1320        default:
1321                ai->ai_protocol = 0;
1322                break;
1323        }
1324        ai->ai_addrlen = sizeof(struct sockaddr_in);
1325        if (hints && (hints->ai_flags & AI_CANONNAME))
1326                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1327        else
1328                ai->ai_canonname = NULL;
1329
1330        sin = xcalloc(1, ai->ai_addrlen);
1331        sin->sin_family = AF_INET;
1332        /* Note: getaddrinfo is supposed to allow service to be a string,
1333         * which should be looked up using getservbyname. This is
1334         * currently not implemented */
1335        if (service)
1336                sin->sin_port = htons(atoi(service));
1337        if (h)
1338                sin->sin_addr = *(struct in_addr *)h->h_addr;
1339        else if (hints && (hints->ai_flags & AI_PASSIVE))
1340                sin->sin_addr.s_addr = INADDR_ANY;
1341        else
1342                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1343        ai->ai_addr = (struct sockaddr *)sin;
1344        ai->ai_next = NULL;
1345        return 0;
1346}
1347
1348static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1349{
1350        free(res->ai_canonname);
1351        free(res->ai_addr);
1352        free(res);
1353}
1354
1355static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1356                                   char *host, DWORD hostlen,
1357                                   char *serv, DWORD servlen, int flags)
1358{
1359        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1360        if (sa->sa_family != AF_INET)
1361                return EAI_FAMILY;
1362        if (!host && !serv)
1363                return EAI_NONAME;
1364
1365        if (host && hostlen > 0) {
1366                struct hostent *ent = NULL;
1367                if (!(flags & NI_NUMERICHOST))
1368                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1369                                            sizeof(sin->sin_addr), AF_INET);
1370
1371                if (ent)
1372                        snprintf(host, hostlen, "%s", ent->h_name);
1373                else if (flags & NI_NAMEREQD)
1374                        return EAI_NONAME;
1375                else
1376                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1377        }
1378
1379        if (serv && servlen > 0) {
1380                struct servent *ent = NULL;
1381                if (!(flags & NI_NUMERICSERV))
1382                        ent = getservbyport(sin->sin_port,
1383                                            flags & NI_DGRAM ? "udp" : "tcp");
1384
1385                if (ent)
1386                        snprintf(serv, servlen, "%s", ent->s_name);
1387                else
1388                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1389        }
1390
1391        return 0;
1392}
1393
1394static HMODULE ipv6_dll = NULL;
1395static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1396static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1397                                      const struct addrinfo *hints,
1398                                      struct addrinfo **res);
1399static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1400                                      char *host, DWORD hostlen,
1401                                      char *serv, DWORD servlen, int flags);
1402/*
1403 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1404 * don't need to try to load that one dynamically.
1405 */
1406
1407static void socket_cleanup(void)
1408{
1409        WSACleanup();
1410        if (ipv6_dll)
1411                FreeLibrary(ipv6_dll);
1412        ipv6_dll = NULL;
1413        ipv6_freeaddrinfo = freeaddrinfo_stub;
1414        ipv6_getaddrinfo = getaddrinfo_stub;
1415        ipv6_getnameinfo = getnameinfo_stub;
1416}
1417
1418static void ensure_socket_initialization(void)
1419{
1420        WSADATA wsa;
1421        static int initialized = 0;
1422        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1423        const char **name;
1424
1425        if (initialized)
1426                return;
1427
1428        if (WSAStartup(MAKEWORD(2,2), &wsa))
1429                die("unable to initialize winsock subsystem, error %d",
1430                        WSAGetLastError());
1431
1432        for (name = libraries; *name; name++) {
1433                ipv6_dll = LoadLibrary(*name);
1434                if (!ipv6_dll)
1435                        continue;
1436
1437                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1438                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1439                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1440                                                   const struct addrinfo *,
1441                                                   struct addrinfo **))
1442                        GetProcAddress(ipv6_dll, "getaddrinfo");
1443                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1444                                                   socklen_t, char *, DWORD,
1445                                                   char *, DWORD, int))
1446                        GetProcAddress(ipv6_dll, "getnameinfo");
1447                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1448                        FreeLibrary(ipv6_dll);
1449                        ipv6_dll = NULL;
1450                } else
1451                        break;
1452        }
1453        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1454                ipv6_freeaddrinfo = freeaddrinfo_stub;
1455                ipv6_getaddrinfo = getaddrinfo_stub;
1456                ipv6_getnameinfo = getnameinfo_stub;
1457        }
1458
1459        atexit(socket_cleanup);
1460        initialized = 1;
1461}
1462
1463#undef gethostname
1464int mingw_gethostname(char *name, int namelen)
1465{
1466    ensure_socket_initialization();
1467    return gethostname(name, namelen);
1468}
1469
1470#undef gethostbyname
1471struct hostent *mingw_gethostbyname(const char *host)
1472{
1473        ensure_socket_initialization();
1474        return gethostbyname(host);
1475}
1476
1477void mingw_freeaddrinfo(struct addrinfo *res)
1478{
1479        ipv6_freeaddrinfo(res);
1480}
1481
1482int mingw_getaddrinfo(const char *node, const char *service,
1483                      const struct addrinfo *hints, struct addrinfo **res)
1484{
1485        ensure_socket_initialization();
1486        return ipv6_getaddrinfo(node, service, hints, res);
1487}
1488
1489int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1490                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1491                      int flags)
1492{
1493        ensure_socket_initialization();
1494        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1495}
1496
1497int mingw_socket(int domain, int type, int protocol)
1498{
1499        int sockfd;
1500        SOCKET s;
1501
1502        ensure_socket_initialization();
1503        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1504        if (s == INVALID_SOCKET) {
1505                /*
1506                 * WSAGetLastError() values are regular BSD error codes
1507                 * biased by WSABASEERR.
1508                 * However, strerror() does not know about networking
1509                 * specific errors, which are values beginning at 38 or so.
1510                 * Therefore, we choose to leave the biased error code
1511                 * in errno so that _if_ someone looks up the code somewhere,
1512                 * then it is at least the number that are usually listed.
1513                 */
1514                errno = WSAGetLastError();
1515                return -1;
1516        }
1517        /* convert into a file descriptor */
1518        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1519                closesocket(s);
1520                return error("unable to make a socket file descriptor: %s",
1521                        strerror(errno));
1522        }
1523        return sockfd;
1524}
1525
1526#undef connect
1527int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1528{
1529        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1530        return connect(s, sa, sz);
1531}
1532
1533#undef bind
1534int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1535{
1536        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1537        return bind(s, sa, sz);
1538}
1539
1540#undef setsockopt
1541int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1542{
1543        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1544        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1545}
1546
1547#undef shutdown
1548int mingw_shutdown(int sockfd, int how)
1549{
1550        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1551        return shutdown(s, how);
1552}
1553
1554#undef listen
1555int mingw_listen(int sockfd, int backlog)
1556{
1557        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1558        return listen(s, backlog);
1559}
1560
1561#undef accept
1562int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1563{
1564        int sockfd2;
1565
1566        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1567        SOCKET s2 = accept(s1, sa, sz);
1568
1569        /* convert into a file descriptor */
1570        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1571                int err = errno;
1572                closesocket(s2);
1573                return error("unable to make a socket file descriptor: %s",
1574                        strerror(err));
1575        }
1576        return sockfd2;
1577}
1578
1579#undef rename
1580int mingw_rename(const char *pold, const char *pnew)
1581{
1582        DWORD attrs, gle;
1583        int tries = 0;
1584        wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1585        if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1586                return -1;
1587
1588        /*
1589         * Try native rename() first to get errno right.
1590         * It is based on MoveFile(), which cannot overwrite existing files.
1591         */
1592        if (!_wrename(wpold, wpnew))
1593                return 0;
1594        if (errno != EEXIST)
1595                return -1;
1596repeat:
1597        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1598                return 0;
1599        /* TODO: translate more errors */
1600        gle = GetLastError();
1601        if (gle == ERROR_ACCESS_DENIED &&
1602            (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1603                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1604                        errno = EISDIR;
1605                        return -1;
1606                }
1607                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1608                    SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1609                        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1610                                return 0;
1611                        gle = GetLastError();
1612                        /* revert file attributes on failure */
1613                        SetFileAttributesW(wpnew, attrs);
1614                }
1615        }
1616        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1617                /*
1618                 * We assume that some other process had the source or
1619                 * destination file open at the wrong moment and retry.
1620                 * In order to give the other process a higher chance to
1621                 * complete its operation, we give up our time slice now.
1622                 * If we have to retry again, we do sleep a bit.
1623                 */
1624                Sleep(delay[tries]);
1625                tries++;
1626                goto repeat;
1627        }
1628        if (gle == ERROR_ACCESS_DENIED &&
1629               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1630                       "Should I try again?", pold, pnew))
1631                goto repeat;
1632
1633        errno = EACCES;
1634        return -1;
1635}
1636
1637/*
1638 * Note that this doesn't return the actual pagesize, but
1639 * the allocation granularity. If future Windows specific git code
1640 * needs the real getpagesize function, we need to find another solution.
1641 */
1642int mingw_getpagesize(void)
1643{
1644        SYSTEM_INFO si;
1645        GetSystemInfo(&si);
1646        return si.dwAllocationGranularity;
1647}
1648
1649struct passwd *getpwuid(int uid)
1650{
1651        static char user_name[100];
1652        static struct passwd p;
1653
1654        DWORD len = sizeof(user_name);
1655        if (!GetUserName(user_name, &len))
1656                return NULL;
1657        p.pw_name = user_name;
1658        p.pw_gecos = "unknown";
1659        p.pw_dir = NULL;
1660        return &p;
1661}
1662
1663static HANDLE timer_event;
1664static HANDLE timer_thread;
1665static int timer_interval;
1666static int one_shot;
1667static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1668
1669/* The timer works like this:
1670 * The thread, ticktack(), is a trivial routine that most of the time
1671 * only waits to receive the signal to terminate. The main thread tells
1672 * the thread to terminate by setting the timer_event to the signalled
1673 * state.
1674 * But ticktack() interrupts the wait state after the timer's interval
1675 * length to call the signal handler.
1676 */
1677
1678static unsigned __stdcall ticktack(void *dummy)
1679{
1680        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1681                mingw_raise(SIGALRM);
1682                if (one_shot)
1683                        break;
1684        }
1685        return 0;
1686}
1687
1688static int start_timer_thread(void)
1689{
1690        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1691        if (timer_event) {
1692                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1693                if (!timer_thread )
1694                        return errno = ENOMEM,
1695                                error("cannot start timer thread");
1696        } else
1697                return errno = ENOMEM,
1698                        error("cannot allocate resources for timer");
1699        return 0;
1700}
1701
1702static void stop_timer_thread(void)
1703{
1704        if (timer_event)
1705                SetEvent(timer_event);  /* tell thread to terminate */
1706        if (timer_thread) {
1707                int rc = WaitForSingleObject(timer_thread, 1000);
1708                if (rc == WAIT_TIMEOUT)
1709                        error("timer thread did not terminate timely");
1710                else if (rc != WAIT_OBJECT_0)
1711                        error("waiting for timer thread failed: %lu",
1712                              GetLastError());
1713                CloseHandle(timer_thread);
1714        }
1715        if (timer_event)
1716                CloseHandle(timer_event);
1717        timer_event = NULL;
1718        timer_thread = NULL;
1719}
1720
1721static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1722{
1723        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1724}
1725
1726int setitimer(int type, struct itimerval *in, struct itimerval *out)
1727{
1728        static const struct timeval zero;
1729        static int atexit_done;
1730
1731        if (out != NULL)
1732                return errno = EINVAL,
1733                        error("setitimer param 3 != NULL not implemented");
1734        if (!is_timeval_eq(&in->it_interval, &zero) &&
1735            !is_timeval_eq(&in->it_interval, &in->it_value))
1736                return errno = EINVAL,
1737                        error("setitimer: it_interval must be zero or eq it_value");
1738
1739        if (timer_thread)
1740                stop_timer_thread();
1741
1742        if (is_timeval_eq(&in->it_value, &zero) &&
1743            is_timeval_eq(&in->it_interval, &zero))
1744                return 0;
1745
1746        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1747        one_shot = is_timeval_eq(&in->it_interval, &zero);
1748        if (!atexit_done) {
1749                atexit(stop_timer_thread);
1750                atexit_done = 1;
1751        }
1752        return start_timer_thread();
1753}
1754
1755int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1756{
1757        if (sig != SIGALRM)
1758                return errno = EINVAL,
1759                        error("sigaction only implemented for SIGALRM");
1760        if (out != NULL)
1761                return errno = EINVAL,
1762                        error("sigaction: param 3 != NULL not implemented");
1763
1764        timer_fn = in->sa_handler;
1765        return 0;
1766}
1767
1768#undef signal
1769sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1770{
1771        sig_handler_t old;
1772
1773        switch (sig) {
1774        case SIGALRM:
1775                old = timer_fn;
1776                timer_fn = handler;
1777                break;
1778
1779        case SIGINT:
1780                old = sigint_fn;
1781                sigint_fn = handler;
1782                break;
1783
1784        default:
1785                return signal(sig, handler);
1786        }
1787
1788        return old;
1789}
1790
1791#undef raise
1792int mingw_raise(int sig)
1793{
1794        switch (sig) {
1795        case SIGALRM:
1796                if (timer_fn == SIG_DFL) {
1797                        if (isatty(STDERR_FILENO))
1798                                fputs("Alarm clock\n", stderr);
1799                        exit(128 + SIGALRM);
1800                } else if (timer_fn != SIG_IGN)
1801                        timer_fn(SIGALRM);
1802                return 0;
1803
1804        case SIGINT:
1805                if (sigint_fn == SIG_DFL)
1806                        exit(128 + SIGINT);
1807                else if (sigint_fn != SIG_IGN)
1808                        sigint_fn(SIGINT);
1809                return 0;
1810
1811        default:
1812                return raise(sig);
1813        }
1814}
1815
1816
1817static const char *make_backslash_path(const char *path)
1818{
1819        static char buf[PATH_MAX + 1];
1820        char *c;
1821
1822        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1823                die("Too long path: %.*s", 60, path);
1824
1825        for (c = buf; *c; c++) {
1826                if (*c == '/')
1827                        *c = '\\';
1828        }
1829        return buf;
1830}
1831
1832void mingw_open_html(const char *unixpath)
1833{
1834        const char *htmlpath = make_backslash_path(unixpath);
1835        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1836                        const char *, const char *, const char *, INT);
1837        T ShellExecute;
1838        HMODULE shell32;
1839        int r;
1840
1841        shell32 = LoadLibrary("shell32.dll");
1842        if (!shell32)
1843                die("cannot load shell32.dll");
1844        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1845        if (!ShellExecute)
1846                die("cannot run browser");
1847
1848        printf("Launching default browser to display HTML ...\n");
1849        r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1850        FreeLibrary(shell32);
1851        /* see the MSDN documentation referring to the result codes here */
1852        if (r <= 32) {
1853                die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1854        }
1855}
1856
1857int link(const char *oldpath, const char *newpath)
1858{
1859        typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1860        static T create_hard_link = NULL;
1861        wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1862        if (xutftowcs_path(woldpath, oldpath) < 0 ||
1863                xutftowcs_path(wnewpath, newpath) < 0)
1864                return -1;
1865
1866        if (!create_hard_link) {
1867                create_hard_link = (T) GetProcAddress(
1868                        GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1869                if (!create_hard_link)
1870                        create_hard_link = (T)-1;
1871        }
1872        if (create_hard_link == (T)-1) {
1873                errno = ENOSYS;
1874                return -1;
1875        }
1876        if (!create_hard_link(wnewpath, woldpath, NULL)) {
1877                errno = err_win_to_posix(GetLastError());
1878                return -1;
1879        }
1880        return 0;
1881}
1882
1883pid_t waitpid(pid_t pid, int *status, int options)
1884{
1885        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1886            FALSE, pid);
1887        if (!h) {
1888                errno = ECHILD;
1889                return -1;
1890        }
1891
1892        if (pid > 0 && options & WNOHANG) {
1893                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1894                        CloseHandle(h);
1895                        return 0;
1896                }
1897                options &= ~WNOHANG;
1898        }
1899
1900        if (options == 0) {
1901                struct pinfo_t **ppinfo;
1902                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1903                        CloseHandle(h);
1904                        return 0;
1905                }
1906
1907                if (status)
1908                        GetExitCodeProcess(h, (LPDWORD)status);
1909
1910                EnterCriticalSection(&pinfo_cs);
1911
1912                ppinfo = &pinfo;
1913                while (*ppinfo) {
1914                        struct pinfo_t *info = *ppinfo;
1915                        if (info->pid == pid) {
1916                                CloseHandle(info->proc);
1917                                *ppinfo = info->next;
1918                                free(info);
1919                                break;
1920                        }
1921                        ppinfo = &info->next;
1922                }
1923
1924                LeaveCriticalSection(&pinfo_cs);
1925
1926                CloseHandle(h);
1927                return pid;
1928        }
1929        CloseHandle(h);
1930
1931        errno = EINVAL;
1932        return -1;
1933}
1934
1935int mingw_skip_dos_drive_prefix(char **path)
1936{
1937        int ret = has_dos_drive_prefix(*path);
1938        *path += ret;
1939        return ret;
1940}
1941
1942int mingw_offset_1st_component(const char *path)
1943{
1944        char *pos = (char *)path;
1945
1946        /* unc paths */
1947        if (!skip_dos_drive_prefix(&pos) &&
1948                        is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
1949                /* skip server name */
1950                pos = strpbrk(pos + 2, "\\/");
1951                if (!pos)
1952                        return 0; /* Error: malformed unc path */
1953
1954                do {
1955                        pos++;
1956                } while (*pos && !is_dir_sep(*pos));
1957        }
1958
1959        return pos + is_dir_sep(*pos) - path;
1960}
1961
1962int 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
2034int 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/*
2048 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2049 * mingw startup code, see init.c in mingw runtime).
2050 */
2051int _CRT_glob = 0;
2052
2053typedef struct {
2054        int newmode;
2055} _startupinfo;
2056
2057extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2058                _startupinfo *si);
2059
2060static NORETURN void die_startup()
2061{
2062        fputs("fatal: not enough memory for initialization", stderr);
2063        exit(128);
2064}
2065
2066static void *malloc_startup(size_t size)
2067{
2068        void *result = malloc(size);
2069        if (!result)
2070                die_startup();
2071        return result;
2072}
2073
2074static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2075{
2076        len = xwcstoutf(buffer, wcs, len) + 1;
2077        return memcpy(malloc_startup(len), buffer, len);
2078}
2079
2080void mingw_startup()
2081{
2082        int i, maxlen, argc;
2083        char *buffer;
2084        wchar_t **wenv, **wargv;
2085        _startupinfo si;
2086
2087        /* get wide char arguments and environment */
2088        si.newmode = 0;
2089        if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2090                die_startup();
2091
2092        /* determine size of argv and environ conversion buffer */
2093        maxlen = wcslen(_wpgmptr);
2094        for (i = 1; i < argc; i++)
2095                maxlen = max(maxlen, wcslen(wargv[i]));
2096        for (i = 0; wenv[i]; i++)
2097                maxlen = max(maxlen, wcslen(wenv[i]));
2098
2099        /*
2100         * nedmalloc can't free CRT memory, allocate resizable environment
2101         * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2102         * use it while initializing the environment itself.
2103         */
2104        environ_size = i + 1;
2105        environ_alloc = alloc_nr(environ_size * sizeof(char*));
2106        environ = malloc_startup(environ_alloc);
2107
2108        /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2109        maxlen = 3 * maxlen + 1;
2110        buffer = malloc_startup(maxlen);
2111
2112        /* convert command line arguments and environment to UTF-8 */
2113        __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2114        for (i = 1; i < argc; i++)
2115                __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2116        for (i = 0; wenv[i]; i++)
2117                environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2118        environ[i] = NULL;
2119        free(buffer);
2120
2121        /* sort environment for O(log n) getenv / putenv */
2122        qsort(environ, i, sizeof(char*), compareenv);
2123
2124        /* fix Windows specific environment settings */
2125
2126        /* on Windows it is TMP and TEMP */
2127        if (!mingw_getenv("TMPDIR")) {
2128                const char *tmp = mingw_getenv("TMP");
2129                if (!tmp)
2130                        tmp = mingw_getenv("TEMP");
2131                if (tmp)
2132                        setenv("TMPDIR", tmp, 1);
2133        }
2134
2135        /* simulate TERM to enable auto-color (see color.c) */
2136        if (!getenv("TERM"))
2137                setenv("TERM", "cygwin", 1);
2138
2139        /* initialize critical section for waitpid pinfo_t list */
2140        InitializeCriticalSection(&pinfo_cs);
2141
2142        /* set up default file mode and file modes for stdin/out/err */
2143        _fmode = _O_BINARY;
2144        _setmode(_fileno(stdin), _O_BINARY);
2145        _setmode(_fileno(stdout), _O_BINARY);
2146        _setmode(_fileno(stderr), _O_BINARY);
2147
2148        /* initialize Unicode console */
2149        winansi_init();
2150}
2151
2152int uname(struct utsname *buf)
2153{
2154        unsigned v = (unsigned)GetVersion();
2155        memset(buf, 0, sizeof(*buf));
2156        xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2157        xsnprintf(buf->release, sizeof(buf->release),
2158                 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2159        /* assuming NT variants only.. */
2160        xsnprintf(buf->version, sizeof(buf->version),
2161                  "%u", (v >> 16) & 0x7fff);
2162        return 0;
2163}