Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit run-command.c: squelch a "use before assignment" warning (5a7a367)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5
   6unsigned int _CRT_fmode = _O_BINARY;
   7
   8static int err_win_to_posix(DWORD winerr)
   9{
  10        int error = ENOSYS;
  11        switch(winerr) {
  12        case ERROR_ACCESS_DENIED: error = EACCES; break;
  13        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  14        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  15        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  16        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  17        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  18        case ERROR_BAD_COMMAND: error = EIO; break;
  19        case ERROR_BAD_DEVICE: error = ENODEV; break;
  20        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  21        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  22        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  23        case ERROR_BAD_LENGTH: error = EINVAL; break;
  24        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  25        case ERROR_BAD_PIPE: error = EPIPE; break;
  26        case ERROR_BAD_UNIT: error = ENODEV; break;
  27        case ERROR_BAD_USERNAME: error = EINVAL; break;
  28        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  29        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  30        case ERROR_BUSY: error = EBUSY; break;
  31        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  32        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  33        case ERROR_CANNOT_MAKE: error = EACCES; break;
  34        case ERROR_CANTOPEN: error = EIO; break;
  35        case ERROR_CANTREAD: error = EIO; break;
  36        case ERROR_CANTWRITE: error = EIO; break;
  37        case ERROR_CRC: error = EIO; break;
  38        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  39        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  40        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  41        case ERROR_DIRECTORY: error = EINVAL; break;
  42        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  43        case ERROR_DISK_CHANGE: error = EIO; break;
  44        case ERROR_DISK_FULL: error = ENOSPC; break;
  45        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  46        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  47        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  48        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  49        case ERROR_FILE_EXISTS: error = EEXIST; break;
  50        case ERROR_FILE_INVALID: error = ENODEV; break;
  51        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  52        case ERROR_GEN_FAILURE: error = EIO; break;
  53        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  54        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  55        case ERROR_INVALID_ACCESS: error = EACCES; break;
  56        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  57        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  58        case ERROR_INVALID_DATA: error = EINVAL; break;
  59        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  60        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  61        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  62        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  63        case ERROR_INVALID_HANDLE: error = EBADF; break;
  64        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  65        case ERROR_INVALID_NAME: error = EINVAL; break;
  66        case ERROR_INVALID_OWNER: error = EINVAL; break;
  67        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  68        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  69        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  70        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  71        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  72        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  73        case ERROR_IO_DEVICE: error = EIO; break;
  74        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  75        case ERROR_LOCKED: error = EBUSY; break;
  76        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  77        case ERROR_LOGON_FAILURE: error = EACCES; break;
  78        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  79        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  80        case ERROR_MORE_DATA: error = EPIPE; break;
  81        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  82        case ERROR_NOACCESS: error = EFAULT; break;
  83        case ERROR_NONE_MAPPED: error = EINVAL; break;
  84        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  85        case ERROR_NOT_READY: error = EAGAIN; break;
  86        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  87        case ERROR_NO_DATA: error = EPIPE; break;
  88        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  89        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  90        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  91        case ERROR_OPEN_FAILED: error = EIO; break;
  92        case ERROR_OPEN_FILES: error = EBUSY; break;
  93        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  94        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  95        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  96        case ERROR_PATH_BUSY: error = EBUSY; break;
  97        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  98        case ERROR_PIPE_BUSY: error = EBUSY; break;
  99        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 100        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 101        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 102        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 103        case ERROR_READ_FAULT: error = EIO; break;
 104        case ERROR_SEEK: error = EIO; break;
 105        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 106        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 107        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 108        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 109        case ERROR_SWAPERROR: error = ENOENT; break;
 110        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 111        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 112        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 113        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 114        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 115        case ERROR_WRITE_FAULT: error = EIO; break;
 116        case ERROR_WRITE_PROTECT: error = EROFS; break;
 117        }
 118        return error;
 119}
 120
 121#undef open
 122int mingw_open (const char *filename, int oflags, ...)
 123{
 124        va_list args;
 125        unsigned mode;
 126        va_start(args, oflags);
 127        mode = va_arg(args, int);
 128        va_end(args);
 129
 130        if (!strcmp(filename, "/dev/null"))
 131                filename = "nul";
 132        int fd = open(filename, oflags, mode);
 133        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 134                DWORD attrs = GetFileAttributes(filename);
 135                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 136                        errno = EISDIR;
 137        }
 138        return fd;
 139}
 140
 141static inline time_t filetime_to_time_t(const FILETIME *ft)
 142{
 143        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 144        winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
 145        winTime /= 10000000;             /* Nano to seconds resolution */
 146        return (time_t)winTime;
 147}
 148
 149/* We keep the do_lstat code in a separate function to avoid recursion.
 150 * When a path ends with a slash, the stat will fail with ENOENT. In
 151 * this case, we strip the trailing slashes and stat again.
 152 */
 153static int do_lstat(const char *file_name, struct stat *buf)
 154{
 155        WIN32_FILE_ATTRIBUTE_DATA fdata;
 156
 157        if (!(errno = get_file_attr(file_name, &fdata))) {
 158                buf->st_ino = 0;
 159                buf->st_gid = 0;
 160                buf->st_uid = 0;
 161                buf->st_nlink = 1;
 162                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 163                buf->st_size = fdata.nFileSizeLow |
 164                        (((off_t)fdata.nFileSizeHigh)<<32);
 165                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 166                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 167                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 168                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 169                return 0;
 170        }
 171        return -1;
 172}
 173
 174/* We provide our own lstat/fstat functions, since the provided
 175 * lstat/fstat functions are so slow. These stat functions are
 176 * tailored for Git's usage (read: fast), and are not meant to be
 177 * complete. Note that Git stat()s are redirected to mingw_lstat()
 178 * too, since Windows doesn't really handle symlinks that well.
 179 */
 180int mingw_lstat(const char *file_name, struct stat *buf)
 181{
 182        int namelen;
 183        static char alt_name[PATH_MAX];
 184
 185        if (!do_lstat(file_name, buf))
 186                return 0;
 187
 188        /* if file_name ended in a '/', Windows returned ENOENT;
 189         * try again without trailing slashes
 190         */
 191        if (errno != ENOENT)
 192                return -1;
 193
 194        namelen = strlen(file_name);
 195        if (namelen && file_name[namelen-1] != '/')
 196                return -1;
 197        while (namelen && file_name[namelen-1] == '/')
 198                --namelen;
 199        if (!namelen || namelen >= PATH_MAX)
 200                return -1;
 201
 202        memcpy(alt_name, file_name, namelen);
 203        alt_name[namelen] = 0;
 204        return do_lstat(alt_name, buf);
 205}
 206
 207#undef fstat
 208int mingw_fstat(int fd, struct stat *buf)
 209{
 210        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 211        BY_HANDLE_FILE_INFORMATION fdata;
 212
 213        if (fh == INVALID_HANDLE_VALUE) {
 214                errno = EBADF;
 215                return -1;
 216        }
 217        /* direct non-file handles to MS's fstat() */
 218        if (GetFileType(fh) != FILE_TYPE_DISK)
 219                return _fstati64(fd, buf);
 220
 221        if (GetFileInformationByHandle(fh, &fdata)) {
 222                buf->st_ino = 0;
 223                buf->st_gid = 0;
 224                buf->st_uid = 0;
 225                buf->st_nlink = 1;
 226                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 227                buf->st_size = fdata.nFileSizeLow |
 228                        (((off_t)fdata.nFileSizeHigh)<<32);
 229                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 230                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 231                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 232                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 233                return 0;
 234        }
 235        errno = EBADF;
 236        return -1;
 237}
 238
 239static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 240{
 241        long long winTime = t * 10000000LL + 116444736000000000LL;
 242        ft->dwLowDateTime = winTime;
 243        ft->dwHighDateTime = winTime >> 32;
 244}
 245
 246int mingw_utime (const char *file_name, const struct utimbuf *times)
 247{
 248        FILETIME mft, aft;
 249        int fh, rc;
 250
 251        /* must have write permission */
 252        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 253                return -1;
 254
 255        time_t_to_filetime(times->modtime, &mft);
 256        time_t_to_filetime(times->actime, &aft);
 257        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 258                errno = EINVAL;
 259                rc = -1;
 260        } else
 261                rc = 0;
 262        close(fh);
 263        return rc;
 264}
 265
 266unsigned int sleep (unsigned int seconds)
 267{
 268        Sleep(seconds*1000);
 269        return 0;
 270}
 271
 272int mkstemp(char *template)
 273{
 274        char *filename = mktemp(template);
 275        if (filename == NULL)
 276                return -1;
 277        return open(filename, O_RDWR | O_CREAT, 0600);
 278}
 279
 280int gettimeofday(struct timeval *tv, void *tz)
 281{
 282        SYSTEMTIME st;
 283        struct tm tm;
 284        GetSystemTime(&st);
 285        tm.tm_year = st.wYear-1900;
 286        tm.tm_mon = st.wMonth-1;
 287        tm.tm_mday = st.wDay;
 288        tm.tm_hour = st.wHour;
 289        tm.tm_min = st.wMinute;
 290        tm.tm_sec = st.wSecond;
 291        tv->tv_sec = tm_to_time_t(&tm);
 292        if (tv->tv_sec < 0)
 293                return -1;
 294        tv->tv_usec = st.wMilliseconds*1000;
 295        return 0;
 296}
 297
 298int pipe(int filedes[2])
 299{
 300        int fd;
 301        HANDLE h[2], parent;
 302
 303        if (_pipe(filedes, 8192, 0) < 0)
 304                return -1;
 305
 306        parent = GetCurrentProcess();
 307
 308        if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 309                        parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 310                close(filedes[0]);
 311                close(filedes[1]);
 312                return -1;
 313        }
 314        if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 315                        parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 316                close(filedes[0]);
 317                close(filedes[1]);
 318                CloseHandle(h[0]);
 319                return -1;
 320        }
 321        fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 322        if (fd < 0) {
 323                close(filedes[0]);
 324                close(filedes[1]);
 325                CloseHandle(h[0]);
 326                CloseHandle(h[1]);
 327                return -1;
 328        }
 329        close(filedes[0]);
 330        filedes[0] = fd;
 331        fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 332        if (fd < 0) {
 333                close(filedes[0]);
 334                close(filedes[1]);
 335                CloseHandle(h[1]);
 336                return -1;
 337        }
 338        close(filedes[1]);
 339        filedes[1] = fd;
 340        return 0;
 341}
 342
 343int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 344{
 345        int i, pending;
 346
 347        if (timeout >= 0) {
 348                if (nfds == 0) {
 349                        Sleep(timeout);
 350                        return 0;
 351                }
 352                return errno = EINVAL, error("poll timeout not supported");
 353        }
 354
 355        /* When there is only one fd to wait for, then we pretend that
 356         * input is available and let the actual wait happen when the
 357         * caller invokes read().
 358         */
 359        if (nfds == 1) {
 360                if (!(ufds[0].events & POLLIN))
 361                        return errno = EINVAL, error("POLLIN not set");
 362                ufds[0].revents = POLLIN;
 363                return 0;
 364        }
 365
 366repeat:
 367        pending = 0;
 368        for (i = 0; i < nfds; i++) {
 369                DWORD avail = 0;
 370                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 371                if (h == INVALID_HANDLE_VALUE)
 372                        return -1;      /* errno was set */
 373
 374                if (!(ufds[i].events & POLLIN))
 375                        return errno = EINVAL, error("POLLIN not set");
 376
 377                /* this emulation works only for pipes */
 378                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 379                        int err = GetLastError();
 380                        if (err == ERROR_BROKEN_PIPE) {
 381                                ufds[i].revents = POLLHUP;
 382                                pending++;
 383                        } else {
 384                                errno = EINVAL;
 385                                return error("PeekNamedPipe failed,"
 386                                        " GetLastError: %u", err);
 387                        }
 388                } else if (avail) {
 389                        ufds[i].revents = POLLIN;
 390                        pending++;
 391                } else
 392                        ufds[i].revents = 0;
 393        }
 394        if (!pending) {
 395                /* The only times that we spin here is when the process
 396                 * that is connected through the pipes is waiting for
 397                 * its own input data to become available. But since
 398                 * the process (pack-objects) is itself CPU intensive,
 399                 * it will happily pick up the time slice that we are
 400                 * relinquishing here.
 401                 */
 402                Sleep(0);
 403                goto repeat;
 404        }
 405        return 0;
 406}
 407
 408struct tm *gmtime_r(const time_t *timep, struct tm *result)
 409{
 410        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 411        memcpy(result, gmtime(timep), sizeof(struct tm));
 412        return result;
 413}
 414
 415struct tm *localtime_r(const time_t *timep, struct tm *result)
 416{
 417        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 418        memcpy(result, localtime(timep), sizeof(struct tm));
 419        return result;
 420}
 421
 422#undef getcwd
 423char *mingw_getcwd(char *pointer, int len)
 424{
 425        int i;
 426        char *ret = getcwd(pointer, len);
 427        if (!ret)
 428                return ret;
 429        for (i = 0; pointer[i]; i++)
 430                if (pointer[i] == '\\')
 431                        pointer[i] = '/';
 432        return ret;
 433}
 434
 435#undef getenv
 436char *mingw_getenv(const char *name)
 437{
 438        char *result = getenv(name);
 439        if (!result && !strcmp(name, "TMPDIR")) {
 440                /* on Windows it is TMP and TEMP */
 441                result = getenv("TMP");
 442                if (!result)
 443                        result = getenv("TEMP");
 444        }
 445        return result;
 446}
 447
 448/*
 449 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 450 * (Parsing C++ Command-Line Arguments)
 451 */
 452static const char *quote_arg(const char *arg)
 453{
 454        /* count chars to quote */
 455        int len = 0, n = 0;
 456        int force_quotes = 0;
 457        char *q, *d;
 458        const char *p = arg;
 459        if (!*p) force_quotes = 1;
 460        while (*p) {
 461                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 462                        force_quotes = 1;
 463                else if (*p == '"')
 464                        n++;
 465                else if (*p == '\\') {
 466                        int count = 0;
 467                        while (*p == '\\') {
 468                                count++;
 469                                p++;
 470                                len++;
 471                        }
 472                        if (*p == '"')
 473                                n += count*2 + 1;
 474                        continue;
 475                }
 476                len++;
 477                p++;
 478        }
 479        if (!force_quotes && n == 0)
 480                return arg;
 481
 482        /* insert \ where necessary */
 483        d = q = xmalloc(len+n+3);
 484        *d++ = '"';
 485        while (*arg) {
 486                if (*arg == '"')
 487                        *d++ = '\\';
 488                else if (*arg == '\\') {
 489                        int count = 0;
 490                        while (*arg == '\\') {
 491                                count++;
 492                                *d++ = *arg++;
 493                        }
 494                        if (*arg == '"') {
 495                                while (count-- > 0)
 496                                        *d++ = '\\';
 497                                *d++ = '\\';
 498                        }
 499                }
 500                *d++ = *arg++;
 501        }
 502        *d++ = '"';
 503        *d++ = 0;
 504        return q;
 505}
 506
 507static const char *parse_interpreter(const char *cmd)
 508{
 509        static char buf[100];
 510        char *p, *opt;
 511        int n, fd;
 512
 513        /* don't even try a .exe */
 514        n = strlen(cmd);
 515        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 516                return NULL;
 517
 518        fd = open(cmd, O_RDONLY);
 519        if (fd < 0)
 520                return NULL;
 521        n = read(fd, buf, sizeof(buf)-1);
 522        close(fd);
 523        if (n < 4)      /* at least '#!/x' and not error */
 524                return NULL;
 525
 526        if (buf[0] != '#' || buf[1] != '!')
 527                return NULL;
 528        buf[n] = '\0';
 529        p = buf + strcspn(buf, "\r\n");
 530        if (!*p)
 531                return NULL;
 532
 533        *p = '\0';
 534        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 535                return NULL;
 536        /* strip options */
 537        if ((opt = strchr(p+1, ' ')))
 538                *opt = '\0';
 539        return p+1;
 540}
 541
 542/*
 543 * Splits the PATH into parts.
 544 */
 545static char **get_path_split(void)
 546{
 547        char *p, **path, *envpath = getenv("PATH");
 548        int i, n = 0;
 549
 550        if (!envpath || !*envpath)
 551                return NULL;
 552
 553        envpath = xstrdup(envpath);
 554        p = envpath;
 555        while (p) {
 556                char *dir = p;
 557                p = strchr(p, ';');
 558                if (p) *p++ = '\0';
 559                if (*dir) {     /* not earlier, catches series of ; */
 560                        ++n;
 561                }
 562        }
 563        if (!n)
 564                return NULL;
 565
 566        path = xmalloc((n+1)*sizeof(char *));
 567        p = envpath;
 568        i = 0;
 569        do {
 570                if (*p)
 571                        path[i++] = xstrdup(p);
 572                p = p+strlen(p)+1;
 573        } while (i < n);
 574        path[i] = NULL;
 575
 576        free(envpath);
 577
 578        return path;
 579}
 580
 581static void free_path_split(char **path)
 582{
 583        if (!path)
 584                return;
 585
 586        char **p = path;
 587        while (*p)
 588                free(*p++);
 589        free(path);
 590}
 591
 592/*
 593 * exe_only means that we only want to detect .exe files, but not scripts
 594 * (which do not have an extension)
 595 */
 596static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 597{
 598        char path[MAX_PATH];
 599        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 600
 601        if (!isexe && access(path, F_OK) == 0)
 602                return xstrdup(path);
 603        path[strlen(path)-4] = '\0';
 604        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 605                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 606                        return xstrdup(path);
 607        return NULL;
 608}
 609
 610/*
 611 * Determines the absolute path of cmd using the the split path in path.
 612 * If cmd contains a slash or backslash, no lookup is performed.
 613 */
 614static char *path_lookup(const char *cmd, char **path, int exe_only)
 615{
 616        char *prog = NULL;
 617        int len = strlen(cmd);
 618        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 619
 620        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 621                prog = xstrdup(cmd);
 622
 623        while (!prog && *path)
 624                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 625
 626        return prog;
 627}
 628
 629static int env_compare(const void *a, const void *b)
 630{
 631        char *const *ea = a;
 632        char *const *eb = b;
 633        return strcasecmp(*ea, *eb);
 634}
 635
 636static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 637                           int prepend_cmd)
 638{
 639        STARTUPINFO si;
 640        PROCESS_INFORMATION pi;
 641        struct strbuf envblk, args;
 642        unsigned flags;
 643        BOOL ret;
 644
 645        /* Determine whether or not we are associated to a console */
 646        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 647                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 648                        FILE_ATTRIBUTE_NORMAL, NULL);
 649        if (cons == INVALID_HANDLE_VALUE) {
 650                /* There is no console associated with this process.
 651                 * Since the child is a console process, Windows
 652                 * would normally create a console window. But
 653                 * since we'll be redirecting std streams, we do
 654                 * not need the console.
 655                 * It is necessary to use DETACHED_PROCESS
 656                 * instead of CREATE_NO_WINDOW to make ssh
 657                 * recognize that it has no console.
 658                 */
 659                flags = DETACHED_PROCESS;
 660        } else {
 661                /* There is already a console. If we specified
 662                 * DETACHED_PROCESS here, too, Windows would
 663                 * disassociate the child from the console.
 664                 * The same is true for CREATE_NO_WINDOW.
 665                 * Go figure!
 666                 */
 667                flags = 0;
 668                CloseHandle(cons);
 669        }
 670        memset(&si, 0, sizeof(si));
 671        si.cb = sizeof(si);
 672        si.dwFlags = STARTF_USESTDHANDLES;
 673        si.hStdInput = (HANDLE) _get_osfhandle(0);
 674        si.hStdOutput = (HANDLE) _get_osfhandle(1);
 675        si.hStdError = (HANDLE) _get_osfhandle(2);
 676
 677        /* concatenate argv, quoting args as we go */
 678        strbuf_init(&args, 0);
 679        if (prepend_cmd) {
 680                char *quoted = (char *)quote_arg(cmd);
 681                strbuf_addstr(&args, quoted);
 682                if (quoted != cmd)
 683                        free(quoted);
 684        }
 685        for (; *argv; argv++) {
 686                char *quoted = (char *)quote_arg(*argv);
 687                if (*args.buf)
 688                        strbuf_addch(&args, ' ');
 689                strbuf_addstr(&args, quoted);
 690                if (quoted != *argv)
 691                        free(quoted);
 692        }
 693
 694        if (env) {
 695                int count = 0;
 696                char **e, **sorted_env;
 697
 698                for (e = env; *e; e++)
 699                        count++;
 700
 701                /* environment must be sorted */
 702                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 703                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 704                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 705
 706                strbuf_init(&envblk, 0);
 707                for (e = sorted_env; *e; e++) {
 708                        strbuf_addstr(&envblk, *e);
 709                        strbuf_addch(&envblk, '\0');
 710                }
 711                free(sorted_env);
 712        }
 713
 714        memset(&pi, 0, sizeof(pi));
 715        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 716                env ? envblk.buf : NULL, NULL, &si, &pi);
 717
 718        if (env)
 719                strbuf_release(&envblk);
 720        strbuf_release(&args);
 721
 722        if (!ret) {
 723                errno = ENOENT;
 724                return -1;
 725        }
 726        CloseHandle(pi.hThread);
 727        return (pid_t)pi.hProcess;
 728}
 729
 730pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 731{
 732        pid_t pid;
 733        char **path = get_path_split();
 734        char *prog = path_lookup(cmd, path, 0);
 735
 736        if (!prog) {
 737                errno = ENOENT;
 738                pid = -1;
 739        }
 740        else {
 741                const char *interpr = parse_interpreter(prog);
 742
 743                if (interpr) {
 744                        const char *argv0 = argv[0];
 745                        char *iprog = path_lookup(interpr, path, 1);
 746                        argv[0] = prog;
 747                        if (!iprog) {
 748                                errno = ENOENT;
 749                                pid = -1;
 750                        }
 751                        else {
 752                                pid = mingw_spawnve(iprog, argv, env, 1);
 753                                free(iprog);
 754                        }
 755                        argv[0] = argv0;
 756                }
 757                else
 758                        pid = mingw_spawnve(prog, argv, env, 0);
 759                free(prog);
 760        }
 761        free_path_split(path);
 762        return pid;
 763}
 764
 765static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 766{
 767        const char *interpr = parse_interpreter(cmd);
 768        char **path;
 769        char *prog;
 770        int pid = 0;
 771
 772        if (!interpr)
 773                return 0;
 774        path = get_path_split();
 775        prog = path_lookup(interpr, path, 1);
 776        if (prog) {
 777                int argc = 0;
 778                const char **argv2;
 779                while (argv[argc]) argc++;
 780                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 781                argv2[0] = (char *)cmd; /* full path to the script file */
 782                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 783                pid = mingw_spawnve(prog, argv2, env, 1);
 784                if (pid >= 0) {
 785                        int status;
 786                        if (waitpid(pid, &status, 0) < 0)
 787                                status = 255;
 788                        exit(status);
 789                }
 790                pid = 1;        /* indicate that we tried but failed */
 791                free(prog);
 792                free(argv2);
 793        }
 794        free_path_split(path);
 795        return pid;
 796}
 797
 798static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 799{
 800        /* check if git_command is a shell script */
 801        if (!try_shell_exec(cmd, argv, (char **)env)) {
 802                int pid, status;
 803
 804                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 805                if (pid < 0)
 806                        return;
 807                if (waitpid(pid, &status, 0) < 0)
 808                        status = 255;
 809                exit(status);
 810        }
 811}
 812
 813void mingw_execvp(const char *cmd, char *const *argv)
 814{
 815        char **path = get_path_split();
 816        char *prog = path_lookup(cmd, path, 0);
 817
 818        if (prog) {
 819                mingw_execve(prog, argv, environ);
 820                free(prog);
 821        } else
 822                errno = ENOENT;
 823
 824        free_path_split(path);
 825}
 826
 827char **copy_environ()
 828{
 829        char **env;
 830        int i = 0;
 831        while (environ[i])
 832                i++;
 833        env = xmalloc((i+1)*sizeof(*env));
 834        for (i = 0; environ[i]; i++)
 835                env[i] = xstrdup(environ[i]);
 836        env[i] = NULL;
 837        return env;
 838}
 839
 840void free_environ(char **env)
 841{
 842        int i;
 843        for (i = 0; env[i]; i++)
 844                free(env[i]);
 845        free(env);
 846}
 847
 848static int lookup_env(char **env, const char *name, size_t nmln)
 849{
 850        int i;
 851
 852        for (i = 0; env[i]; i++) {
 853                if (0 == strncmp(env[i], name, nmln)
 854                    && '=' == env[i][nmln])
 855                        /* matches */
 856                        return i;
 857        }
 858        return -1;
 859}
 860
 861/*
 862 * If name contains '=', then sets the variable, otherwise it unsets it
 863 */
 864char **env_setenv(char **env, const char *name)
 865{
 866        char *eq = strchrnul(name, '=');
 867        int i = lookup_env(env, name, eq-name);
 868
 869        if (i < 0) {
 870                if (*eq) {
 871                        for (i = 0; env[i]; i++)
 872                                ;
 873                        env = xrealloc(env, (i+2)*sizeof(*env));
 874                        env[i] = xstrdup(name);
 875                        env[i+1] = NULL;
 876                }
 877        }
 878        else {
 879                free(env[i]);
 880                if (*eq)
 881                        env[i] = xstrdup(name);
 882                else
 883                        for (; env[i]; i++)
 884                                env[i] = env[i+1];
 885        }
 886        return env;
 887}
 888
 889/* this is the first function to call into WS_32; initialize it */
 890#undef gethostbyname
 891struct hostent *mingw_gethostbyname(const char *host)
 892{
 893        WSADATA wsa;
 894
 895        if (WSAStartup(MAKEWORD(2,2), &wsa))
 896                die("unable to initialize winsock subsystem, error %d",
 897                        WSAGetLastError());
 898        atexit((void(*)(void)) WSACleanup);
 899        return gethostbyname(host);
 900}
 901
 902int mingw_socket(int domain, int type, int protocol)
 903{
 904        int sockfd;
 905        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
 906        if (s == INVALID_SOCKET) {
 907                /*
 908                 * WSAGetLastError() values are regular BSD error codes
 909                 * biased by WSABASEERR.
 910                 * However, strerror() does not know about networking
 911                 * specific errors, which are values beginning at 38 or so.
 912                 * Therefore, we choose to leave the biased error code
 913                 * in errno so that _if_ someone looks up the code somewhere,
 914                 * then it is at least the number that are usually listed.
 915                 */
 916                errno = WSAGetLastError();
 917                return -1;
 918        }
 919        /* convert into a file descriptor */
 920        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
 921                closesocket(s);
 922                return error("unable to make a socket file descriptor: %s",
 923                        strerror(errno));
 924        }
 925        return sockfd;
 926}
 927
 928#undef connect
 929int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
 930{
 931        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
 932        return connect(s, sa, sz);
 933}
 934
 935#undef rename
 936int mingw_rename(const char *pold, const char *pnew)
 937{
 938        DWORD attrs, gle;
 939        int tries = 0;
 940        static const int delay[] = { 0, 1, 10, 20, 40 };
 941
 942        /*
 943         * Try native rename() first to get errno right.
 944         * It is based on MoveFile(), which cannot overwrite existing files.
 945         */
 946        if (!rename(pold, pnew))
 947                return 0;
 948        if (errno != EEXIST)
 949                return -1;
 950repeat:
 951        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 952                return 0;
 953        /* TODO: translate more errors */
 954        gle = GetLastError();
 955        if (gle == ERROR_ACCESS_DENIED &&
 956            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
 957                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
 958                        errno = EISDIR;
 959                        return -1;
 960                }
 961                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
 962                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
 963                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 964                                return 0;
 965                        gle = GetLastError();
 966                        /* revert file attributes on failure */
 967                        SetFileAttributes(pnew, attrs);
 968                }
 969        }
 970        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
 971                /*
 972                 * We assume that some other process had the source or
 973                 * destination file open at the wrong moment and retry.
 974                 * In order to give the other process a higher chance to
 975                 * complete its operation, we give up our time slice now.
 976                 * If we have to retry again, we do sleep a bit.
 977                 */
 978                Sleep(delay[tries]);
 979                tries++;
 980                goto repeat;
 981        }
 982        errno = EACCES;
 983        return -1;
 984}
 985
 986struct passwd *getpwuid(int uid)
 987{
 988        static char user_name[100];
 989        static struct passwd p;
 990
 991        DWORD len = sizeof(user_name);
 992        if (!GetUserName(user_name, &len))
 993                return NULL;
 994        p.pw_name = user_name;
 995        p.pw_gecos = "unknown";
 996        p.pw_dir = NULL;
 997        return &p;
 998}
 999
1000static HANDLE timer_event;
1001static HANDLE timer_thread;
1002static int timer_interval;
1003static int one_shot;
1004static sig_handler_t timer_fn = SIG_DFL;
1005
1006/* The timer works like this:
1007 * The thread, ticktack(), is a trivial routine that most of the time
1008 * only waits to receive the signal to terminate. The main thread tells
1009 * the thread to terminate by setting the timer_event to the signalled
1010 * state.
1011 * But ticktack() interrupts the wait state after the timer's interval
1012 * length to call the signal handler.
1013 */
1014
1015static __stdcall unsigned ticktack(void *dummy)
1016{
1017        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1018                if (timer_fn == SIG_DFL)
1019                        die("Alarm");
1020                if (timer_fn != SIG_IGN)
1021                        timer_fn(SIGALRM);
1022                if (one_shot)
1023                        break;
1024        }
1025        return 0;
1026}
1027
1028static int start_timer_thread(void)
1029{
1030        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1031        if (timer_event) {
1032                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1033                if (!timer_thread )
1034                        return errno = ENOMEM,
1035                                error("cannot start timer thread");
1036        } else
1037                return errno = ENOMEM,
1038                        error("cannot allocate resources for timer");
1039        return 0;
1040}
1041
1042static void stop_timer_thread(void)
1043{
1044        if (timer_event)
1045                SetEvent(timer_event);  /* tell thread to terminate */
1046        if (timer_thread) {
1047                int rc = WaitForSingleObject(timer_thread, 1000);
1048                if (rc == WAIT_TIMEOUT)
1049                        error("timer thread did not terminate timely");
1050                else if (rc != WAIT_OBJECT_0)
1051                        error("waiting for timer thread failed: %lu",
1052                              GetLastError());
1053                CloseHandle(timer_thread);
1054        }
1055        if (timer_event)
1056                CloseHandle(timer_event);
1057        timer_event = NULL;
1058        timer_thread = NULL;
1059}
1060
1061static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1062{
1063        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1064}
1065
1066int setitimer(int type, struct itimerval *in, struct itimerval *out)
1067{
1068        static const struct timeval zero;
1069        static int atexit_done;
1070
1071        if (out != NULL)
1072                return errno = EINVAL,
1073                        error("setitimer param 3 != NULL not implemented");
1074        if (!is_timeval_eq(&in->it_interval, &zero) &&
1075            !is_timeval_eq(&in->it_interval, &in->it_value))
1076                return errno = EINVAL,
1077                        error("setitimer: it_interval must be zero or eq it_value");
1078
1079        if (timer_thread)
1080                stop_timer_thread();
1081
1082        if (is_timeval_eq(&in->it_value, &zero) &&
1083            is_timeval_eq(&in->it_interval, &zero))
1084                return 0;
1085
1086        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1087        one_shot = is_timeval_eq(&in->it_interval, &zero);
1088        if (!atexit_done) {
1089                atexit(stop_timer_thread);
1090                atexit_done = 1;
1091        }
1092        return start_timer_thread();
1093}
1094
1095int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1096{
1097        if (sig != SIGALRM)
1098                return errno = EINVAL,
1099                        error("sigaction only implemented for SIGALRM");
1100        if (out != NULL)
1101                return errno = EINVAL,
1102                        error("sigaction: param 3 != NULL not implemented");
1103
1104        timer_fn = in->sa_handler;
1105        return 0;
1106}
1107
1108#undef signal
1109sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1110{
1111        if (sig != SIGALRM)
1112                return signal(sig, handler);
1113        sig_handler_t old = timer_fn;
1114        timer_fn = handler;
1115        return old;
1116}
1117
1118static const char *make_backslash_path(const char *path)
1119{
1120        static char buf[PATH_MAX + 1];
1121        char *c;
1122
1123        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1124                die("Too long path: %.*s", 60, path);
1125
1126        for (c = buf; *c; c++) {
1127                if (*c == '/')
1128                        *c = '\\';
1129        }
1130        return buf;
1131}
1132
1133void mingw_open_html(const char *unixpath)
1134{
1135        const char *htmlpath = make_backslash_path(unixpath);
1136        printf("Launching default browser to display HTML ...\n");
1137        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1138}
1139
1140int link(const char *oldpath, const char *newpath)
1141{
1142        typedef BOOL WINAPI (*T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1143        static T create_hard_link = NULL;
1144        if (!create_hard_link) {
1145                create_hard_link = (T) GetProcAddress(
1146                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1147                if (!create_hard_link)
1148                        create_hard_link = (T)-1;
1149        }
1150        if (create_hard_link == (T)-1) {
1151                errno = ENOSYS;
1152                return -1;
1153        }
1154        if (!create_hard_link(newpath, oldpath, NULL)) {
1155                errno = err_win_to_posix(GetLastError());
1156                return -1;
1157        }
1158        return 0;
1159}
1160
1161char *getpass(const char *prompt)
1162{
1163        struct strbuf buf = STRBUF_INIT;
1164
1165        fputs(prompt, stderr);
1166        for (;;) {
1167                char c = _getch();
1168                if (c == '\r' || c == '\n')
1169                        break;
1170                strbuf_addch(&buf, c);
1171        }
1172        fputs("\n", stderr);
1173        return strbuf_detach(&buf, NULL);
1174}
1175
1176#ifndef NO_MINGW_REPLACE_READDIR
1177/* MinGW readdir implementation to avoid extra lstats for Git */
1178struct mingw_DIR
1179{
1180        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1181        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1182        long                    dd_handle;      /* _findnext handle */
1183        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1184        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1185};
1186
1187struct dirent *mingw_readdir(DIR *dir)
1188{
1189        WIN32_FIND_DATAA buf;
1190        HANDLE handle;
1191        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1192
1193        if (!dir->dd_handle) {
1194                errno = EBADF; /* No set_errno for mingw */
1195                return NULL;
1196        }
1197
1198        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1199        {
1200                handle = FindFirstFileA(dir->dd_name, &buf);
1201                DWORD lasterr = GetLastError();
1202                dir->dd_handle = (long)handle;
1203                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1204                        errno = err_win_to_posix(lasterr);
1205                        return NULL;
1206                }
1207        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1208                return NULL;
1209        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1210                DWORD lasterr = GetLastError();
1211                FindClose((HANDLE)dir->dd_handle);
1212                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1213                /* POSIX says you shouldn't set errno when readdir can't
1214                   find any more files; so, if another error we leave it set. */
1215                if (lasterr != ERROR_NO_MORE_FILES)
1216                        errno = err_win_to_posix(lasterr);
1217                return NULL;
1218        }
1219
1220        /* We get here if `buf' contains valid data.  */
1221        strcpy(dir->dd_dir.d_name, buf.cFileName);
1222        ++dir->dd_stat;
1223
1224        /* Set file type, based on WIN32_FIND_DATA */
1225        mdir->dd_dir.d_type = 0;
1226        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1227                mdir->dd_dir.d_type |= DT_DIR;
1228        else
1229                mdir->dd_dir.d_type |= DT_REG;
1230
1231        return (struct dirent*)&dir->dd_dir;
1232}
1233#endif // !NO_MINGW_REPLACE_READDIR