Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit Merge branch 'rs/maint-grep-word-regexp-fix' (8e105e3)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include "../strbuf.h"
   4
   5unsigned int _CRT_fmode = _O_BINARY;
   6
   7static int err_win_to_posix(DWORD winerr)
   8{
   9        int error = ENOSYS;
  10        switch(winerr) {
  11        case ERROR_ACCESS_DENIED: error = EACCES; break;
  12        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  13        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  14        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  15        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  16        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  17        case ERROR_BAD_COMMAND: error = EIO; break;
  18        case ERROR_BAD_DEVICE: error = ENODEV; break;
  19        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  20        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  21        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  22        case ERROR_BAD_LENGTH: error = EINVAL; break;
  23        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  24        case ERROR_BAD_PIPE: error = EPIPE; break;
  25        case ERROR_BAD_UNIT: error = ENODEV; break;
  26        case ERROR_BAD_USERNAME: error = EINVAL; break;
  27        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  28        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  29        case ERROR_BUSY: error = EBUSY; break;
  30        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  31        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  32        case ERROR_CANNOT_MAKE: error = EACCES; break;
  33        case ERROR_CANTOPEN: error = EIO; break;
  34        case ERROR_CANTREAD: error = EIO; break;
  35        case ERROR_CANTWRITE: error = EIO; break;
  36        case ERROR_CRC: error = EIO; break;
  37        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  38        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  39        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  40        case ERROR_DIRECTORY: error = EINVAL; break;
  41        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  42        case ERROR_DISK_CHANGE: error = EIO; break;
  43        case ERROR_DISK_FULL: error = ENOSPC; break;
  44        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  45        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  46        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  47        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  48        case ERROR_FILE_EXISTS: error = EEXIST; break;
  49        case ERROR_FILE_INVALID: error = ENODEV; break;
  50        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  51        case ERROR_GEN_FAILURE: error = EIO; break;
  52        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  53        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  54        case ERROR_INVALID_ACCESS: error = EACCES; break;
  55        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  56        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  57        case ERROR_INVALID_DATA: error = EINVAL; break;
  58        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  59        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  60        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  61        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  62        case ERROR_INVALID_HANDLE: error = EBADF; break;
  63        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  64        case ERROR_INVALID_NAME: error = EINVAL; break;
  65        case ERROR_INVALID_OWNER: error = EINVAL; break;
  66        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  67        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  68        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  69        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  70        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  71        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  72        case ERROR_IO_DEVICE: error = EIO; break;
  73        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  74        case ERROR_LOCKED: error = EBUSY; break;
  75        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  76        case ERROR_LOGON_FAILURE: error = EACCES; break;
  77        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  78        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  79        case ERROR_MORE_DATA: error = EPIPE; break;
  80        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  81        case ERROR_NOACCESS: error = EFAULT; break;
  82        case ERROR_NONE_MAPPED: error = EINVAL; break;
  83        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  84        case ERROR_NOT_READY: error = EAGAIN; break;
  85        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  86        case ERROR_NO_DATA: error = EPIPE; break;
  87        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  88        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  89        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  90        case ERROR_OPEN_FAILED: error = EIO; break;
  91        case ERROR_OPEN_FILES: error = EBUSY; break;
  92        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  93        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  94        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  95        case ERROR_PATH_BUSY: error = EBUSY; break;
  96        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  97        case ERROR_PIPE_BUSY: error = EBUSY; break;
  98        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
  99        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 100        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 101        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 102        case ERROR_READ_FAULT: error = EIO; break;
 103        case ERROR_SEEK: error = EIO; break;
 104        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 105        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 106        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 107        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 108        case ERROR_SWAPERROR: error = ENOENT; break;
 109        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 110        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 111        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 112        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 113        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 114        case ERROR_WRITE_FAULT: error = EIO; break;
 115        case ERROR_WRITE_PROTECT: error = EROFS; break;
 116        }
 117        return error;
 118}
 119
 120#undef open
 121int mingw_open (const char *filename, int oflags, ...)
 122{
 123        va_list args;
 124        unsigned mode;
 125        va_start(args, oflags);
 126        mode = va_arg(args, int);
 127        va_end(args);
 128
 129        if (!strcmp(filename, "/dev/null"))
 130                filename = "nul";
 131        int fd = open(filename, oflags, mode);
 132        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 133                DWORD attrs = GetFileAttributes(filename);
 134                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 135                        errno = EISDIR;
 136        }
 137        return fd;
 138}
 139
 140static inline time_t filetime_to_time_t(const FILETIME *ft)
 141{
 142        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 143        winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
 144        winTime /= 10000000;             /* Nano to seconds resolution */
 145        return (time_t)winTime;
 146}
 147
 148/* We keep the do_lstat code in a separate function to avoid recursion.
 149 * When a path ends with a slash, the stat will fail with ENOENT. In
 150 * this case, we strip the trailing slashes and stat again.
 151 */
 152static int do_lstat(const char *file_name, struct stat *buf)
 153{
 154        WIN32_FILE_ATTRIBUTE_DATA fdata;
 155
 156        if (!(errno = get_file_attr(file_name, &fdata))) {
 157                buf->st_ino = 0;
 158                buf->st_gid = 0;
 159                buf->st_uid = 0;
 160                buf->st_nlink = 1;
 161                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 162                buf->st_size = fdata.nFileSizeLow |
 163                        (((off_t)fdata.nFileSizeHigh)<<32);
 164                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 165                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 166                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 167                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 168                return 0;
 169        }
 170        return -1;
 171}
 172
 173/* We provide our own lstat/fstat functions, since the provided
 174 * lstat/fstat functions are so slow. These stat functions are
 175 * tailored for Git's usage (read: fast), and are not meant to be
 176 * complete. Note that Git stat()s are redirected to mingw_lstat()
 177 * too, since Windows doesn't really handle symlinks that well.
 178 */
 179int mingw_lstat(const char *file_name, struct stat *buf)
 180{
 181        int namelen;
 182        static char alt_name[PATH_MAX];
 183
 184        if (!do_lstat(file_name, buf))
 185                return 0;
 186
 187        /* if file_name ended in a '/', Windows returned ENOENT;
 188         * try again without trailing slashes
 189         */
 190        if (errno != ENOENT)
 191                return -1;
 192
 193        namelen = strlen(file_name);
 194        if (namelen && file_name[namelen-1] != '/')
 195                return -1;
 196        while (namelen && file_name[namelen-1] == '/')
 197                --namelen;
 198        if (!namelen || namelen >= PATH_MAX)
 199                return -1;
 200
 201        memcpy(alt_name, file_name, namelen);
 202        alt_name[namelen] = 0;
 203        return do_lstat(alt_name, buf);
 204}
 205
 206#undef fstat
 207int mingw_fstat(int fd, struct stat *buf)
 208{
 209        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 210        BY_HANDLE_FILE_INFORMATION fdata;
 211
 212        if (fh == INVALID_HANDLE_VALUE) {
 213                errno = EBADF;
 214                return -1;
 215        }
 216        /* direct non-file handles to MS's fstat() */
 217        if (GetFileType(fh) != FILE_TYPE_DISK)
 218                return _fstati64(fd, buf);
 219
 220        if (GetFileInformationByHandle(fh, &fdata)) {
 221                buf->st_ino = 0;
 222                buf->st_gid = 0;
 223                buf->st_uid = 0;
 224                buf->st_nlink = 1;
 225                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 226                buf->st_size = fdata.nFileSizeLow |
 227                        (((off_t)fdata.nFileSizeHigh)<<32);
 228                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 229                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 230                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 231                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 232                return 0;
 233        }
 234        errno = EBADF;
 235        return -1;
 236}
 237
 238static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 239{
 240        long long winTime = t * 10000000LL + 116444736000000000LL;
 241        ft->dwLowDateTime = winTime;
 242        ft->dwHighDateTime = winTime >> 32;
 243}
 244
 245int mingw_utime (const char *file_name, const struct utimbuf *times)
 246{
 247        FILETIME mft, aft;
 248        int fh, rc;
 249
 250        /* must have write permission */
 251        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 252                return -1;
 253
 254        time_t_to_filetime(times->modtime, &mft);
 255        time_t_to_filetime(times->actime, &aft);
 256        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 257                errno = EINVAL;
 258                rc = -1;
 259        } else
 260                rc = 0;
 261        close(fh);
 262        return rc;
 263}
 264
 265unsigned int sleep (unsigned int seconds)
 266{
 267        Sleep(seconds*1000);
 268        return 0;
 269}
 270
 271int mkstemp(char *template)
 272{
 273        char *filename = mktemp(template);
 274        if (filename == NULL)
 275                return -1;
 276        return open(filename, O_RDWR | O_CREAT, 0600);
 277}
 278
 279int gettimeofday(struct timeval *tv, void *tz)
 280{
 281        SYSTEMTIME st;
 282        struct tm tm;
 283        GetSystemTime(&st);
 284        tm.tm_year = st.wYear-1900;
 285        tm.tm_mon = st.wMonth-1;
 286        tm.tm_mday = st.wDay;
 287        tm.tm_hour = st.wHour;
 288        tm.tm_min = st.wMinute;
 289        tm.tm_sec = st.wSecond;
 290        tv->tv_sec = tm_to_time_t(&tm);
 291        if (tv->tv_sec < 0)
 292                return -1;
 293        tv->tv_usec = st.wMilliseconds*1000;
 294        return 0;
 295}
 296
 297int pipe(int filedes[2])
 298{
 299        int fd;
 300        HANDLE h[2], parent;
 301
 302        if (_pipe(filedes, 8192, 0) < 0)
 303                return -1;
 304
 305        parent = GetCurrentProcess();
 306
 307        if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 308                        parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 309                close(filedes[0]);
 310                close(filedes[1]);
 311                return -1;
 312        }
 313        if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 314                        parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 315                close(filedes[0]);
 316                close(filedes[1]);
 317                CloseHandle(h[0]);
 318                return -1;
 319        }
 320        fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 321        if (fd < 0) {
 322                close(filedes[0]);
 323                close(filedes[1]);
 324                CloseHandle(h[0]);
 325                CloseHandle(h[1]);
 326                return -1;
 327        }
 328        close(filedes[0]);
 329        filedes[0] = fd;
 330        fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 331        if (fd < 0) {
 332                close(filedes[0]);
 333                close(filedes[1]);
 334                CloseHandle(h[1]);
 335                return -1;
 336        }
 337        close(filedes[1]);
 338        filedes[1] = fd;
 339        return 0;
 340}
 341
 342int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 343{
 344        int i, pending;
 345
 346        if (timeout >= 0) {
 347                if (nfds == 0) {
 348                        Sleep(timeout);
 349                        return 0;
 350                }
 351                return errno = EINVAL, error("poll timeout not supported");
 352        }
 353
 354        /* When there is only one fd to wait for, then we pretend that
 355         * input is available and let the actual wait happen when the
 356         * caller invokes read().
 357         */
 358        if (nfds == 1) {
 359                if (!(ufds[0].events & POLLIN))
 360                        return errno = EINVAL, error("POLLIN not set");
 361                ufds[0].revents = POLLIN;
 362                return 0;
 363        }
 364
 365repeat:
 366        pending = 0;
 367        for (i = 0; i < nfds; i++) {
 368                DWORD avail = 0;
 369                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 370                if (h == INVALID_HANDLE_VALUE)
 371                        return -1;      /* errno was set */
 372
 373                if (!(ufds[i].events & POLLIN))
 374                        return errno = EINVAL, error("POLLIN not set");
 375
 376                /* this emulation works only for pipes */
 377                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 378                        int err = GetLastError();
 379                        if (err == ERROR_BROKEN_PIPE) {
 380                                ufds[i].revents = POLLHUP;
 381                                pending++;
 382                        } else {
 383                                errno = EINVAL;
 384                                return error("PeekNamedPipe failed,"
 385                                        " GetLastError: %u", err);
 386                        }
 387                } else if (avail) {
 388                        ufds[i].revents = POLLIN;
 389                        pending++;
 390                } else
 391                        ufds[i].revents = 0;
 392        }
 393        if (!pending) {
 394                /* The only times that we spin here is when the process
 395                 * that is connected through the pipes is waiting for
 396                 * its own input data to become available. But since
 397                 * the process (pack-objects) is itself CPU intensive,
 398                 * it will happily pick up the time slice that we are
 399                 * relinquishing here.
 400                 */
 401                Sleep(0);
 402                goto repeat;
 403        }
 404        return 0;
 405}
 406
 407struct tm *gmtime_r(const time_t *timep, struct tm *result)
 408{
 409        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 410        memcpy(result, gmtime(timep), sizeof(struct tm));
 411        return result;
 412}
 413
 414struct tm *localtime_r(const time_t *timep, struct tm *result)
 415{
 416        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 417        memcpy(result, localtime(timep), sizeof(struct tm));
 418        return result;
 419}
 420
 421#undef getcwd
 422char *mingw_getcwd(char *pointer, int len)
 423{
 424        int i;
 425        char *ret = getcwd(pointer, len);
 426        if (!ret)
 427                return ret;
 428        for (i = 0; pointer[i]; i++)
 429                if (pointer[i] == '\\')
 430                        pointer[i] = '/';
 431        return ret;
 432}
 433
 434#undef getenv
 435char *mingw_getenv(const char *name)
 436{
 437        char *result = getenv(name);
 438        if (!result && !strcmp(name, "TMPDIR")) {
 439                /* on Windows it is TMP and TEMP */
 440                result = getenv("TMP");
 441                if (!result)
 442                        result = getenv("TEMP");
 443        }
 444        return result;
 445}
 446
 447/*
 448 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 449 * (Parsing C++ Command-Line Arguments)
 450 */
 451static const char *quote_arg(const char *arg)
 452{
 453        /* count chars to quote */
 454        int len = 0, n = 0;
 455        int force_quotes = 0;
 456        char *q, *d;
 457        const char *p = arg;
 458        if (!*p) force_quotes = 1;
 459        while (*p) {
 460                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 461                        force_quotes = 1;
 462                else if (*p == '"')
 463                        n++;
 464                else if (*p == '\\') {
 465                        int count = 0;
 466                        while (*p == '\\') {
 467                                count++;
 468                                p++;
 469                                len++;
 470                        }
 471                        if (*p == '"')
 472                                n += count*2 + 1;
 473                        continue;
 474                }
 475                len++;
 476                p++;
 477        }
 478        if (!force_quotes && n == 0)
 479                return arg;
 480
 481        /* insert \ where necessary */
 482        d = q = xmalloc(len+n+3);
 483        *d++ = '"';
 484        while (*arg) {
 485                if (*arg == '"')
 486                        *d++ = '\\';
 487                else if (*arg == '\\') {
 488                        int count = 0;
 489                        while (*arg == '\\') {
 490                                count++;
 491                                *d++ = *arg++;
 492                        }
 493                        if (*arg == '"') {
 494                                while (count-- > 0)
 495                                        *d++ = '\\';
 496                                *d++ = '\\';
 497                        }
 498                }
 499                *d++ = *arg++;
 500        }
 501        *d++ = '"';
 502        *d++ = 0;
 503        return q;
 504}
 505
 506static const char *parse_interpreter(const char *cmd)
 507{
 508        static char buf[100];
 509        char *p, *opt;
 510        int n, fd;
 511
 512        /* don't even try a .exe */
 513        n = strlen(cmd);
 514        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 515                return NULL;
 516
 517        fd = open(cmd, O_RDONLY);
 518        if (fd < 0)
 519                return NULL;
 520        n = read(fd, buf, sizeof(buf)-1);
 521        close(fd);
 522        if (n < 4)      /* at least '#!/x' and not error */
 523                return NULL;
 524
 525        if (buf[0] != '#' || buf[1] != '!')
 526                return NULL;
 527        buf[n] = '\0';
 528        p = buf + strcspn(buf, "\r\n");
 529        if (!*p)
 530                return NULL;
 531
 532        *p = '\0';
 533        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 534                return NULL;
 535        /* strip options */
 536        if ((opt = strchr(p+1, ' ')))
 537                *opt = '\0';
 538        return p+1;
 539}
 540
 541/*
 542 * Splits the PATH into parts.
 543 */
 544static char **get_path_split(void)
 545{
 546        char *p, **path, *envpath = getenv("PATH");
 547        int i, n = 0;
 548
 549        if (!envpath || !*envpath)
 550                return NULL;
 551
 552        envpath = xstrdup(envpath);
 553        p = envpath;
 554        while (p) {
 555                char *dir = p;
 556                p = strchr(p, ';');
 557                if (p) *p++ = '\0';
 558                if (*dir) {     /* not earlier, catches series of ; */
 559                        ++n;
 560                }
 561        }
 562        if (!n)
 563                return NULL;
 564
 565        path = xmalloc((n+1)*sizeof(char *));
 566        p = envpath;
 567        i = 0;
 568        do {
 569                if (*p)
 570                        path[i++] = xstrdup(p);
 571                p = p+strlen(p)+1;
 572        } while (i < n);
 573        path[i] = NULL;
 574
 575        free(envpath);
 576
 577        return path;
 578}
 579
 580static void free_path_split(char **path)
 581{
 582        if (!path)
 583                return;
 584
 585        char **p = path;
 586        while (*p)
 587                free(*p++);
 588        free(path);
 589}
 590
 591/*
 592 * exe_only means that we only want to detect .exe files, but not scripts
 593 * (which do not have an extension)
 594 */
 595static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 596{
 597        char path[MAX_PATH];
 598        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 599
 600        if (!isexe && access(path, F_OK) == 0)
 601                return xstrdup(path);
 602        path[strlen(path)-4] = '\0';
 603        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 604                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 605                        return xstrdup(path);
 606        return NULL;
 607}
 608
 609/*
 610 * Determines the absolute path of cmd using the the split path in path.
 611 * If cmd contains a slash or backslash, no lookup is performed.
 612 */
 613static char *path_lookup(const char *cmd, char **path, int exe_only)
 614{
 615        char *prog = NULL;
 616        int len = strlen(cmd);
 617        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 618
 619        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 620                prog = xstrdup(cmd);
 621
 622        while (!prog && *path)
 623                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 624
 625        return prog;
 626}
 627
 628static int env_compare(const void *a, const void *b)
 629{
 630        char *const *ea = a;
 631        char *const *eb = b;
 632        return strcasecmp(*ea, *eb);
 633}
 634
 635static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 636                           int prepend_cmd)
 637{
 638        STARTUPINFO si;
 639        PROCESS_INFORMATION pi;
 640        struct strbuf envblk, args;
 641        unsigned flags;
 642        BOOL ret;
 643
 644        /* Determine whether or not we are associated to a console */
 645        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 646                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 647                        FILE_ATTRIBUTE_NORMAL, NULL);
 648        if (cons == INVALID_HANDLE_VALUE) {
 649                /* There is no console associated with this process.
 650                 * Since the child is a console process, Windows
 651                 * would normally create a console window. But
 652                 * since we'll be redirecting std streams, we do
 653                 * not need the console.
 654                 * It is necessary to use DETACHED_PROCESS
 655                 * instead of CREATE_NO_WINDOW to make ssh
 656                 * recognize that it has no console.
 657                 */
 658                flags = DETACHED_PROCESS;
 659        } else {
 660                /* There is already a console. If we specified
 661                 * DETACHED_PROCESS here, too, Windows would
 662                 * disassociate the child from the console.
 663                 * The same is true for CREATE_NO_WINDOW.
 664                 * Go figure!
 665                 */
 666                flags = 0;
 667                CloseHandle(cons);
 668        }
 669        memset(&si, 0, sizeof(si));
 670        si.cb = sizeof(si);
 671        si.dwFlags = STARTF_USESTDHANDLES;
 672        si.hStdInput = (HANDLE) _get_osfhandle(0);
 673        si.hStdOutput = (HANDLE) _get_osfhandle(1);
 674        si.hStdError = (HANDLE) _get_osfhandle(2);
 675
 676        /* concatenate argv, quoting args as we go */
 677        strbuf_init(&args, 0);
 678        if (prepend_cmd) {
 679                char *quoted = (char *)quote_arg(cmd);
 680                strbuf_addstr(&args, quoted);
 681                if (quoted != cmd)
 682                        free(quoted);
 683        }
 684        for (; *argv; argv++) {
 685                char *quoted = (char *)quote_arg(*argv);
 686                if (*args.buf)
 687                        strbuf_addch(&args, ' ');
 688                strbuf_addstr(&args, quoted);
 689                if (quoted != *argv)
 690                        free(quoted);
 691        }
 692
 693        if (env) {
 694                int count = 0;
 695                char **e, **sorted_env;
 696
 697                for (e = env; *e; e++)
 698                        count++;
 699
 700                /* environment must be sorted */
 701                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 702                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 703                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 704
 705                strbuf_init(&envblk, 0);
 706                for (e = sorted_env; *e; e++) {
 707                        strbuf_addstr(&envblk, *e);
 708                        strbuf_addch(&envblk, '\0');
 709                }
 710                free(sorted_env);
 711        }
 712
 713        memset(&pi, 0, sizeof(pi));
 714        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 715                env ? envblk.buf : NULL, NULL, &si, &pi);
 716
 717        if (env)
 718                strbuf_release(&envblk);
 719        strbuf_release(&args);
 720
 721        if (!ret) {
 722                errno = ENOENT;
 723                return -1;
 724        }
 725        CloseHandle(pi.hThread);
 726        return (pid_t)pi.hProcess;
 727}
 728
 729pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 730{
 731        pid_t pid;
 732        char **path = get_path_split();
 733        char *prog = path_lookup(cmd, path, 0);
 734
 735        if (!prog) {
 736                errno = ENOENT;
 737                pid = -1;
 738        }
 739        else {
 740                const char *interpr = parse_interpreter(prog);
 741
 742                if (interpr) {
 743                        const char *argv0 = argv[0];
 744                        char *iprog = path_lookup(interpr, path, 1);
 745                        argv[0] = prog;
 746                        if (!iprog) {
 747                                errno = ENOENT;
 748                                pid = -1;
 749                        }
 750                        else {
 751                                pid = mingw_spawnve(iprog, argv, env, 1);
 752                                free(iprog);
 753                        }
 754                        argv[0] = argv0;
 755                }
 756                else
 757                        pid = mingw_spawnve(prog, argv, env, 0);
 758                free(prog);
 759        }
 760        free_path_split(path);
 761        return pid;
 762}
 763
 764static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 765{
 766        const char *interpr = parse_interpreter(cmd);
 767        char **path;
 768        char *prog;
 769        int pid = 0;
 770
 771        if (!interpr)
 772                return 0;
 773        path = get_path_split();
 774        prog = path_lookup(interpr, path, 1);
 775        if (prog) {
 776                int argc = 0;
 777                const char **argv2;
 778                while (argv[argc]) argc++;
 779                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 780                argv2[0] = (char *)cmd; /* full path to the script file */
 781                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 782                pid = mingw_spawnve(prog, argv2, env, 1);
 783                if (pid >= 0) {
 784                        int status;
 785                        if (waitpid(pid, &status, 0) < 0)
 786                                status = 255;
 787                        exit(status);
 788                }
 789                pid = 1;        /* indicate that we tried but failed */
 790                free(prog);
 791                free(argv2);
 792        }
 793        free_path_split(path);
 794        return pid;
 795}
 796
 797static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 798{
 799        /* check if git_command is a shell script */
 800        if (!try_shell_exec(cmd, argv, (char **)env)) {
 801                int pid, status;
 802
 803                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 804                if (pid < 0)
 805                        return;
 806                if (waitpid(pid, &status, 0) < 0)
 807                        status = 255;
 808                exit(status);
 809        }
 810}
 811
 812void mingw_execvp(const char *cmd, char *const *argv)
 813{
 814        char **path = get_path_split();
 815        char *prog = path_lookup(cmd, path, 0);
 816
 817        if (prog) {
 818                mingw_execve(prog, argv, environ);
 819                free(prog);
 820        } else
 821                errno = ENOENT;
 822
 823        free_path_split(path);
 824}
 825
 826char **copy_environ()
 827{
 828        char **env;
 829        int i = 0;
 830        while (environ[i])
 831                i++;
 832        env = xmalloc((i+1)*sizeof(*env));
 833        for (i = 0; environ[i]; i++)
 834                env[i] = xstrdup(environ[i]);
 835        env[i] = NULL;
 836        return env;
 837}
 838
 839void free_environ(char **env)
 840{
 841        int i;
 842        for (i = 0; env[i]; i++)
 843                free(env[i]);
 844        free(env);
 845}
 846
 847static int lookup_env(char **env, const char *name, size_t nmln)
 848{
 849        int i;
 850
 851        for (i = 0; env[i]; i++) {
 852                if (0 == strncmp(env[i], name, nmln)
 853                    && '=' == env[i][nmln])
 854                        /* matches */
 855                        return i;
 856        }
 857        return -1;
 858}
 859
 860/*
 861 * If name contains '=', then sets the variable, otherwise it unsets it
 862 */
 863char **env_setenv(char **env, const char *name)
 864{
 865        char *eq = strchrnul(name, '=');
 866        int i = lookup_env(env, name, eq-name);
 867
 868        if (i < 0) {
 869                if (*eq) {
 870                        for (i = 0; env[i]; i++)
 871                                ;
 872                        env = xrealloc(env, (i+2)*sizeof(*env));
 873                        env[i] = xstrdup(name);
 874                        env[i+1] = NULL;
 875                }
 876        }
 877        else {
 878                free(env[i]);
 879                if (*eq)
 880                        env[i] = xstrdup(name);
 881                else
 882                        for (; env[i]; i++)
 883                                env[i] = env[i+1];
 884        }
 885        return env;
 886}
 887
 888/* this is the first function to call into WS_32; initialize it */
 889#undef gethostbyname
 890struct hostent *mingw_gethostbyname(const char *host)
 891{
 892        WSADATA wsa;
 893
 894        if (WSAStartup(MAKEWORD(2,2), &wsa))
 895                die("unable to initialize winsock subsystem, error %d",
 896                        WSAGetLastError());
 897        atexit((void(*)(void)) WSACleanup);
 898        return gethostbyname(host);
 899}
 900
 901int mingw_socket(int domain, int type, int protocol)
 902{
 903        int sockfd;
 904        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
 905        if (s == INVALID_SOCKET) {
 906                /*
 907                 * WSAGetLastError() values are regular BSD error codes
 908                 * biased by WSABASEERR.
 909                 * However, strerror() does not know about networking
 910                 * specific errors, which are values beginning at 38 or so.
 911                 * Therefore, we choose to leave the biased error code
 912                 * in errno so that _if_ someone looks up the code somewhere,
 913                 * then it is at least the number that are usually listed.
 914                 */
 915                errno = WSAGetLastError();
 916                return -1;
 917        }
 918        /* convert into a file descriptor */
 919        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
 920                closesocket(s);
 921                return error("unable to make a socket file descriptor: %s",
 922                        strerror(errno));
 923        }
 924        return sockfd;
 925}
 926
 927#undef connect
 928int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
 929{
 930        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
 931        return connect(s, sa, sz);
 932}
 933
 934#undef rename
 935int mingw_rename(const char *pold, const char *pnew)
 936{
 937        DWORD attrs, gle;
 938        int tries = 0;
 939        static const int delay[] = { 0, 1, 10, 20, 40 };
 940
 941        /*
 942         * Try native rename() first to get errno right.
 943         * It is based on MoveFile(), which cannot overwrite existing files.
 944         */
 945        if (!rename(pold, pnew))
 946                return 0;
 947        if (errno != EEXIST)
 948                return -1;
 949repeat:
 950        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 951                return 0;
 952        /* TODO: translate more errors */
 953        gle = GetLastError();
 954        if (gle == ERROR_ACCESS_DENIED &&
 955            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
 956                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
 957                        errno = EISDIR;
 958                        return -1;
 959                }
 960                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
 961                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
 962                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 963                                return 0;
 964                        gle = GetLastError();
 965                        /* revert file attributes on failure */
 966                        SetFileAttributes(pnew, attrs);
 967                }
 968        }
 969        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
 970                /*
 971                 * We assume that some other process had the source or
 972                 * destination file open at the wrong moment and retry.
 973                 * In order to give the other process a higher chance to
 974                 * complete its operation, we give up our time slice now.
 975                 * If we have to retry again, we do sleep a bit.
 976                 */
 977                Sleep(delay[tries]);
 978                tries++;
 979                goto repeat;
 980        }
 981        errno = EACCES;
 982        return -1;
 983}
 984
 985struct passwd *getpwuid(int uid)
 986{
 987        static char user_name[100];
 988        static struct passwd p;
 989
 990        DWORD len = sizeof(user_name);
 991        if (!GetUserName(user_name, &len))
 992                return NULL;
 993        p.pw_name = user_name;
 994        p.pw_gecos = "unknown";
 995        p.pw_dir = NULL;
 996        return &p;
 997}
 998
 999static HANDLE timer_event;
1000static HANDLE timer_thread;
1001static int timer_interval;
1002static int one_shot;
1003static sig_handler_t timer_fn = SIG_DFL;
1004
1005/* The timer works like this:
1006 * The thread, ticktack(), is a trivial routine that most of the time
1007 * only waits to receive the signal to terminate. The main thread tells
1008 * the thread to terminate by setting the timer_event to the signalled
1009 * state.
1010 * But ticktack() interrupts the wait state after the timer's interval
1011 * length to call the signal handler.
1012 */
1013
1014static __stdcall unsigned ticktack(void *dummy)
1015{
1016        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1017                if (timer_fn == SIG_DFL)
1018                        die("Alarm");
1019                if (timer_fn != SIG_IGN)
1020                        timer_fn(SIGALRM);
1021                if (one_shot)
1022                        break;
1023        }
1024        return 0;
1025}
1026
1027static int start_timer_thread(void)
1028{
1029        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1030        if (timer_event) {
1031                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1032                if (!timer_thread )
1033                        return errno = ENOMEM,
1034                                error("cannot start timer thread");
1035        } else
1036                return errno = ENOMEM,
1037                        error("cannot allocate resources for timer");
1038        return 0;
1039}
1040
1041static void stop_timer_thread(void)
1042{
1043        if (timer_event)
1044                SetEvent(timer_event);  /* tell thread to terminate */
1045        if (timer_thread) {
1046                int rc = WaitForSingleObject(timer_thread, 1000);
1047                if (rc == WAIT_TIMEOUT)
1048                        error("timer thread did not terminate timely");
1049                else if (rc != WAIT_OBJECT_0)
1050                        error("waiting for timer thread failed: %lu",
1051                              GetLastError());
1052                CloseHandle(timer_thread);
1053        }
1054        if (timer_event)
1055                CloseHandle(timer_event);
1056        timer_event = NULL;
1057        timer_thread = NULL;
1058}
1059
1060static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1061{
1062        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1063}
1064
1065int setitimer(int type, struct itimerval *in, struct itimerval *out)
1066{
1067        static const struct timeval zero;
1068        static int atexit_done;
1069
1070        if (out != NULL)
1071                return errno = EINVAL,
1072                        error("setitimer param 3 != NULL not implemented");
1073        if (!is_timeval_eq(&in->it_interval, &zero) &&
1074            !is_timeval_eq(&in->it_interval, &in->it_value))
1075                return errno = EINVAL,
1076                        error("setitimer: it_interval must be zero or eq it_value");
1077
1078        if (timer_thread)
1079                stop_timer_thread();
1080
1081        if (is_timeval_eq(&in->it_value, &zero) &&
1082            is_timeval_eq(&in->it_interval, &zero))
1083                return 0;
1084
1085        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1086        one_shot = is_timeval_eq(&in->it_interval, &zero);
1087        if (!atexit_done) {
1088                atexit(stop_timer_thread);
1089                atexit_done = 1;
1090        }
1091        return start_timer_thread();
1092}
1093
1094int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1095{
1096        if (sig != SIGALRM)
1097                return errno = EINVAL,
1098                        error("sigaction only implemented for SIGALRM");
1099        if (out != NULL)
1100                return errno = EINVAL,
1101                        error("sigaction: param 3 != NULL not implemented");
1102
1103        timer_fn = in->sa_handler;
1104        return 0;
1105}
1106
1107#undef signal
1108sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1109{
1110        if (sig != SIGALRM)
1111                return signal(sig, handler);
1112        sig_handler_t old = timer_fn;
1113        timer_fn = handler;
1114        return old;
1115}
1116
1117static const char *make_backslash_path(const char *path)
1118{
1119        static char buf[PATH_MAX + 1];
1120        char *c;
1121
1122        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1123                die("Too long path: %.*s", 60, path);
1124
1125        for (c = buf; *c; c++) {
1126                if (*c == '/')
1127                        *c = '\\';
1128        }
1129        return buf;
1130}
1131
1132void mingw_open_html(const char *unixpath)
1133{
1134        const char *htmlpath = make_backslash_path(unixpath);
1135        printf("Launching default browser to display HTML ...\n");
1136        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1137}
1138
1139int link(const char *oldpath, const char *newpath)
1140{
1141        typedef BOOL WINAPI (*T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1142        static T create_hard_link = NULL;
1143        if (!create_hard_link) {
1144                create_hard_link = (T) GetProcAddress(
1145                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1146                if (!create_hard_link)
1147                        create_hard_link = (T)-1;
1148        }
1149        if (create_hard_link == (T)-1) {
1150                errno = ENOSYS;
1151                return -1;
1152        }
1153        if (!create_hard_link(newpath, oldpath, NULL)) {
1154                errno = err_win_to_posix(GetLastError());
1155                return -1;
1156        }
1157        return 0;
1158}
1159
1160char *getpass(const char *prompt)
1161{
1162        struct strbuf buf = STRBUF_INIT;
1163
1164        fputs(prompt, stderr);
1165        for (;;) {
1166                char c = _getch();
1167                if (c == '\r' || c == '\n')
1168                        break;
1169                strbuf_addch(&buf, c);
1170        }
1171        fputs("\n", stderr);
1172        return strbuf_detach(&buf, NULL);
1173}