lib/ntdll/rtl/path.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS system libraries
   5  * FILE:            lib/ntdll/rtl/path.c
   6  * PURPOSE:         Path and current directory functions
   7  * UPDATE HISTORY:
   8  *                  Created 03/02/00
   9  */
  10
  11 /* INCLUDES ******************************************************************/
  12
  13 #include <ddk/ntddk.h>
  14 #include <ntdll/rtl.h>
  15 #include <string.h>
  16 #include <stdio.h>
  17 #include <ctype.h>
  18 #include <ddk/obfuncs.h>
  19
  20 #define NDEBUG
  21 #include <ntdll/ntdll.h>
  22
  23 /* DEFINITONS and MACROS ******************************************************/
  24
  25 #define MAX_PFX_SIZE       16
  26
  27 #define IS_PATH_SEPARATOR(x) (((x)==L'\\')||((x)==L'/'))
  28
  29 /* GLOBALS ********************************************************************/
  30
  31 static const UNICODE_STRING _condev =
  32 {
  33     .Length         = sizeof(L"\\\\.\\CON") - sizeof(WCHAR),
  34     .MaximumLength  = sizeof(L"\\\\.\\CON"),
  35     .Buffer         = L"\\\\.\\CON"
  36 };
  37
  38 static const UNICODE_STRING _lpt =
  39 {
  40     .Length         = sizeof(L"LPT") - sizeof(WCHAR),
  41     .MaximumLength  = sizeof(L"LPT"),
  42     .Buffer         = L"LPT"
  43 };
  44
  45 static const UNICODE_STRING _com =
  46 {
  47     .Length         = sizeof(L"COM") - sizeof(WCHAR),
  48     .MaximumLength  = sizeof(L"COM"),
  49     .Buffer         = L"COM"
  50 };
  51
  52 static const UNICODE_STRING _prn =
  53 {
  54     .Length         = sizeof(L"PRN") - sizeof(WCHAR),
  55     .MaximumLength  = sizeof(L"PRN"),
  56     .Buffer         = L"PRN"
  57 };
  58
  59 static const UNICODE_STRING _aux =
  60 {
  61     .Length         = sizeof(L"AUX") - sizeof(WCHAR),
  62     .MaximumLength  = sizeof(L"AUX"),
  63     .Buffer         = L"AUX"
  64 };
  65
  66 static const UNICODE_STRING _con =
  67 {
  68     .Length         = sizeof(L"CON") - sizeof(WCHAR),
  69     .MaximumLength  = sizeof(L"CON"),
  70     .Buffer         = L"CON"
  71 };
  72
  73 static const UNICODE_STRING _nul =
  74 {
  75     .Length         = sizeof(L"NUL") - sizeof(WCHAR),
  76     .MaximumLength  = sizeof(L"NUL"),
  77     .Buffer         = L"NUL"
  78 };
  79
  80 /* FUNCTIONS *****************************************************************/
  81
  82 static ULONG RtlpGetDotSequence (PWSTR p)
  83 {
  84    ULONG Count = 0;
  85
  86    for (;;)
  87      {
  88         if (*p == '.')
  89           Count++;
  90         else if ((*p == '\\' || *p == '\0') && Count)
  91           return Count;
  92         else
  93           return 0;
  94         p++;
  95      }
  96    return 0;
  97 }
  98
  99
 100 static VOID RtlpEatPath (PWSTR Path)
 101 {
 102    PWSTR p, prev;
 103
 104    p = Path + 2;
 105    prev = p;
 106
 107    while ((*p) != 0 || ((*p) == L'\\' && (*(p+1)) == 0))
 108      {
 109         ULONG DotLen;
 110
 111         DotLen = RtlpGetDotSequence (p+1);
 112         DPRINT("DotSequenceLength %u\n", DotLen);
 113         DPRINT("prev '%S' p '%S'\n",prev,p);
 114
 115         if (DotLen == 0)
 116           {
 117              prev = p;
 118              p = wcschr(p + 1, L'\\');
 119              if (p == NULL)
 120              {
 121                  break;
 122              }
 123           }
 124         else if (DotLen == 1)
 125           {
 126              wcscpy (p, p+2);
 127           }
 128         else
 129           {
 130              if (DotLen > 2)
 131                {
 132                   int n = DotLen - 2;
 133
 134                   while (n > 0 && prev > (Path + 2))
 135                     {
 136                        prev--;
 137                        if ((*prev) == L'\\')
 138                          n--;
 139                     }
 140                }
 141
 142              if (*(p + DotLen + 1) == 0)
 143                *(prev + 1) = 0;
 144                         else
 145                wcscpy (prev, p + DotLen + 1);
 146              p = prev;
 147              if (prev > (Path + 2))
 148                {
 149                   prev--;
 150                   while ((*prev) != L'\\')
 151                     {
 152                        prev--;
 153                     }
 154                }
 155           }
 156      }
 157      if (Path[2] == 0)
 158      {
 159         Path[2] = L'\\';
 160         Path[3] = 0;
 161      }
 162 }
 163
 164
 165 /*
 166  * @implemented
 167  */
 168 ULONG STDCALL RtlGetLongestNtPathLength (VOID)
 169 {
 170    return (MAX_PATH + 9);
 171 }
 172
 173
 174 /*
 175  * @implemented
 176  */
 177 ULONG STDCALL
 178 RtlDetermineDosPathNameType_U(PWSTR Path)
 179 {
 180    DPRINT("RtlDetermineDosPathNameType_U %S\n", Path);
 181
 182    if (Path == NULL)
 183      {
 184         return 0;
 185      }
 186
 187    if (IS_PATH_SEPARATOR(Path[0]))
 188      {
 189         if (!IS_PATH_SEPARATOR(Path[1]))
 190           {
 191              return 4;                  /* \xxx   */
 192           }
 193
 194         if (Path[2] != L'.')
 195           return 1;                     /* \\xxx   */
 196
 197         if (IS_PATH_SEPARATOR(Path[3]))
 198           return 6;                     /* \\.\xxx */
 199
 200         if (Path[3])
 201           return 1;                     /* \\.xxxx */
 202
 203         return 7;                               /* \\.     */
 204      }
 205    else
 206      {
 207         if (Path[1] != L':')
 208                 return 5;                       /* xxx     */
 209
 210         if (IS_PATH_SEPARATOR(Path[2]))
 211                 return 2;                       /* x:\xxx  */
 212
 213         return 3;                               /* x:xxx   */
 214    }
 215 }
 216
 217
 218 /* returns 0 if name is not valid DOS device name, or DWORD with
 219  * offset in bytes to DOS device name from beginning of buffer in high word
 220  * and size in bytes of DOS device name in low word */
 221
 222 /*
 223  * @implemented
 224  */
 225 ULONG STDCALL
 226 RtlIsDosDeviceName_U(PWSTR DeviceName)
 227 {
 228    ULONG Type;
 229    ULONG Length = 0;
 230    ULONG Offset;
 231    PWCHAR wc;
 232    UNICODE_STRING DeviceNameU;
 233
 234    if (DeviceName == NULL)
 235      {
 236         return 0;
 237      }
 238
 239    while (DeviceName[Length])
 240      {
 241         Length++;
 242      }
 243
 244    Type = RtlDetermineDosPathNameType_U(DeviceName);
 245    if (Type <= 1)
 246      {
 247         return 0;
 248      }
 249
 250    if (Type == 6)
 251      {
 252         DeviceNameU.Length = DeviceNameU.MaximumLength = Length * sizeof(WCHAR);
 253         DeviceNameU.Buffer = DeviceName;
 254         if (Length == 7 &&
 255             RtlEqualUnicodeString(&DeviceNameU, (PUNICODE_STRING)&_condev, TRUE))
 256                 return 0x00080006;
 257         return 0;
 258      }
 259
 260    /* name can end with ':' */
 261    if (Length && DeviceName[Length - 1 ] == L':')
 262      {
 263         Length--;
 264      }
 265
 266    /* there can be spaces or points at the end of name */
 267    wc = DeviceName + Length - 1;
 268    while (Length && (*wc == L'.' || *wc == L' '))
 269      {
 270         Length--;
 271         wc--;
 272      }
 273
 274    /* let's find a beginning of name */
 275    wc = DeviceName + Length - 1;
 276    while (wc > DeviceName && !IS_PATH_SEPARATOR(*(wc - 1)))
 277      {
 278         wc--;
 279      }
 280    Offset = wc - DeviceName;
 281    Length -= Offset;
 282    DeviceNameU.Length = DeviceNameU.MaximumLength = 3 * sizeof(WCHAR);
 283    DeviceNameU.Buffer = wc;
 284
 285    /* check for LPTx or COMx */
 286    if (Length == 4 && wc[3] >= L'0' && wc[3] <= L'9')
 287      {
 288         if (wc[3] == L'0')
 289           {
 290              return 0;
 291           }
 292
 293         if (RtlEqualUnicodeString(&DeviceNameU, (PUNICODE_STRING)&_lpt, TRUE) ||
 294             RtlEqualUnicodeString(&DeviceNameU, (PUNICODE_STRING)&_com, TRUE))
 295           {
 296              return ((Offset * 2) << 16 ) | 8;
 297           }
 298         return 0;
 299      }
 300
 301    /* check for PRN,AUX,NUL or CON */
 302    if (Length == 3 &&
 303        (RtlEqualUnicodeString(&DeviceNameU, (PUNICODE_STRING)&_prn, TRUE) ||
 304         RtlEqualUnicodeString(&DeviceNameU, (PUNICODE_STRING)&_aux, TRUE) ||
 305         RtlEqualUnicodeString(&DeviceNameU, (PUNICODE_STRING)&_nul, TRUE) ||
 306         RtlEqualUnicodeString(&DeviceNameU, (PUNICODE_STRING)&_con, TRUE)))
 307      {
 308         return ((Offset * 2) << 16) | 6;
 309      }
 310
 311    return 0;
 312 }
 313
 314
 315 /*
 316  * @implemented
 317  */
 318 ULONG STDCALL
 319 RtlGetCurrentDirectory_U(ULONG MaximumLength,
 320                          PWSTR Buffer)
 321 {
 322         ULONG Length;
 323         PCURDIR cd;
 324
 325         DPRINT ("RtlGetCurrentDirectory %lu %p\n", MaximumLength, Buffer);
 326
 327         RtlAcquirePebLock();
 328
 329         cd = (PCURDIR)&(NtCurrentPeb ()->ProcessParameters->CurrentDirectoryName);
 330         Length = cd->DosPath.Length / sizeof(WCHAR);
 331         if (cd->DosPath.Buffer[Length - 1] == L'\\' &&
 332             cd->DosPath.Buffer[Length - 2] != L':')
 333                 Length--;
 334
 335         DPRINT ("cd->DosPath.Buffer %S Length %d\n",
 336                 cd->DosPath.Buffer, Length);
 337
 338         if (MaximumLength / sizeof(WCHAR) > Length)
 339         {
 340                 memcpy (Buffer,
 341                         cd->DosPath.Buffer,
 342                         Length * sizeof(WCHAR));
 343                 Buffer[Length] = 0;
 344         }
 345         else
 346         {
 347                 Length++;
 348         }
 349
 350         RtlReleasePebLock ();
 351
 352         DPRINT ("CurrentDirectory %S\n", Buffer);
 353
 354         return (Length * sizeof(WCHAR));
 355 }
 356
 357
 358 /*
 359  * @implemented
 360  */
 361 NTSTATUS STDCALL
 362 RtlSetCurrentDirectory_U(PUNICODE_STRING name)
 363 {
 364    UNICODE_STRING full;
 365    UNICODE_STRING envvar;
 366    OBJECT_ATTRIBUTES Attr;
 367    IO_STATUS_BLOCK iosb;
 368    PCURDIR cd;
 369    NTSTATUS Status;
 370    ULONG size;
 371    HANDLE handle = NULL;
 372    PWSTR wcs;
 373    PWSTR buf = 0;
 374    PFILE_NAME_INFORMATION filenameinfo;
 375    ULONG backslashcount = 0;
 376    PWSTR cntr;
 377    WCHAR var[4];
 378
 379    DPRINT ("RtlSetCurrentDirectory %wZ\n", name);
 380
 381    RtlAcquirePebLock ();
 382    cd = (PCURDIR)&NtCurrentPeb ()->ProcessParameters->CurrentDirectoryName;
 383    size = cd->DosPath.MaximumLength;
 384
 385    buf = RtlAllocateHeap (RtlGetProcessHeap(),
 386                           0,
 387                           size);
 388    if (buf == NULL)
 389      {
 390         RtlReleasePebLock ();
 391         return STATUS_NO_MEMORY;
 392      }
 393
 394    size = RtlGetFullPathName_U (name->Buffer, size, buf, 0);
 395    if (!size)
 396      {
 397         RtlFreeHeap (RtlGetProcessHeap (),
 398                      0,
 399                      buf);
 400         RtlReleasePebLock ();
 401         return STATUS_OBJECT_NAME_INVALID;
 402      }
 403
 404    if (!RtlDosPathNameToNtPathName_U (buf, &full, 0, 0))
 405      {
 406         RtlFreeHeap (RtlGetProcessHeap (),
 407                      0,
 408                      buf);
 409         RtlFreeHeap (RtlGetProcessHeap (),
 410                      0,
 411                      full.Buffer);
 412         RtlReleasePebLock ();
 413         return STATUS_OBJECT_NAME_INVALID;
 414      }
 415
 416    InitializeObjectAttributes (&Attr,
 417                                &full,
 418                                OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
 419                                NULL,
 420                                NULL);
 421
 422    Status = NtOpenFile (&handle,
 423                         SYNCHRONIZE | FILE_TRAVERSE,
 424                         &Attr,
 425                         &iosb,
 426                         FILE_SHARE_READ | FILE_SHARE_WRITE,
 427                         FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT);
 428    if (!NT_SUCCESS(Status))
 429      {
 430         RtlFreeHeap (RtlGetProcessHeap (),
 431                      0,
 432                      buf);
 433         RtlFreeHeap (RtlGetProcessHeap (),
 434                      0,
 435                      full.Buffer);
 436         RtlReleasePebLock ();
 437         return Status;
 438      }
 439
 440    filenameinfo = RtlAllocateHeap(RtlGetProcessHeap(),
 441                                   0,
 442                                   MAX_PATH*sizeof(WCHAR)+sizeof(ULONG));
 443
 444    Status = NtQueryInformationFile(handle,
 445                                    &iosb,
 446                                    filenameinfo,
 447                                    MAX_PATH*sizeof(WCHAR)+sizeof(ULONG),
 448                                    FileNameInformation);
 449    if (!NT_SUCCESS(Status))
 450      {
 451         RtlFreeHeap(RtlGetProcessHeap(),
 452                     0,
 453                     filenameinfo);
 454         RtlFreeHeap(RtlGetProcessHeap(),
 455                     0,
 456                     buf);
 457         RtlFreeHeap(RtlGetProcessHeap(),
 458                     0,
 459                     full.Buffer);
 460         RtlReleasePebLock();
 461         return(Status);
 462      }
 463
 464    if (filenameinfo->FileName[1]) // If it's just "\", we need special handling
 465      {
 466         wcs = buf + size / sizeof(WCHAR) - 1;
 467         if (*wcs == L'\\')
 468           {
 469             *(wcs) = 0;
 470             wcs--;
 471             size -= sizeof(WCHAR);
 472           }
 473
 474         for (cntr=filenameinfo->FileName;*cntr!=0;cntr++)
 475           {
 476              if (*cntr=='\\') backslashcount++;
 477           }
 478
 479         DPRINT("%d \n",backslashcount);
 480         for (;backslashcount;wcs--)
 481           {
 482              if (*wcs=='\\') backslashcount--;
 483           }
 484         wcs++;
 485
 486         wcscpy(wcs,filenameinfo->FileName);
 487
 488         size=((wcs-buf)+wcslen(filenameinfo->FileName))*sizeof(WCHAR);
 489      }
 490
 491    RtlFreeHeap (RtlGetProcessHeap (),
 492                 0,
 493                 filenameinfo);
 494
 495    /* append backslash if missing */
 496    wcs = buf + size / sizeof(WCHAR) - 1;
 497    if (*wcs != L'\\')
 498      {
 499         *(++wcs) = L'\\';
 500         *(++wcs) = 0;
 501         size += sizeof(WCHAR);
 502      }
 503
 504    memmove(cd->DosPath.Buffer,
 505            buf,
 506            size + sizeof(WCHAR));
 507    cd->DosPath.Length = size;
 508
 509    if (cd->Handle)
 510      NtClose(cd->Handle);
 511    cd->Handle = handle;
 512
 513    if (cd->DosPath.Buffer[1]==':')
 514      {
 515         envvar.Length = 2 * swprintf (var, L"=%c:", cd->DosPath.Buffer[0]);
 516         envvar.MaximumLength = 8;
 517         envvar.Buffer = var;
 518
 519         RtlSetEnvironmentVariable(NULL,
 520                                   &envvar,
 521                                   &cd->DosPath);
 522    }
 523
 524    RtlFreeHeap (RtlGetProcessHeap (),
 525                 0,
 526                 buf);
 527
 528    RtlFreeHeap (RtlGetProcessHeap (),
 529                 0,
 530                 full.Buffer);
 531
 532    RtlReleasePebLock();
 533
 534    return STATUS_SUCCESS;
 535 }
 536
 537 /*
 538  * @implemented
 539  */
 540 ULONG STDCALL
 541 RtlGetFullPathName_U(PWSTR DosName,
 542                      ULONG size,
 543                      PWSTR buf,
 544                      PWSTR *FilePart)
 545 {
 546         WCHAR           *wcs, var[4], drive;
 547         ULONG           len;
 548         ULONG           templen = 0;
 549         DWORD           offs, sz, type;
 550         UNICODE_STRING  usvar, pfx;
 551         PCURDIR cd;
 552         NTSTATUS Status;
 553         WCHAR TempFullPathName[MAX_PATH] = L"";
 554
 555         DPRINT("RtlGetFullPathName_U %S %ld %p %p\n",
 556                DosName, size, buf, FilePart);
 557
 558         if (!DosName || !*DosName)
 559                 return 0;
 560
 561         len = wcslen (DosName);
 562
 563         /* strip trailing spaces */
 564         while (len && DosName[len - 1] == L' ')
 565                 len--;
 566         if (!len)
 567                 return 0;
 568
 569         /* strip trailing path separator (but don't change '\') */
 570         if ((len > 1) &&
 571             IS_PATH_SEPARATOR(DosName[len - 1]))
 572                 len--;
 573         if (FilePart)
 574                 *FilePart = NULL;
 575         *buf = 0;
 576
 577 CHECKPOINT;
 578         /* check for DOS device name */
 579         sz = RtlIsDosDeviceName_U (DosName);
 580         if (sz)
 581         {
 582                 offs = sz >> 17;
 583                 sz &= 0x0000FFFF;
 584                 if (sz + 8 >= size)
 585                     return sz + 10;
 586                 wcscpy (buf, L"\\\\.\\");
 587                 wcsncat (buf, DosName + offs, sz / sizeof(WCHAR));
 588                 return sz + 8;
 589         }
 590
 591 CHECKPOINT;
 592         type = RtlDetermineDosPathNameType_U (DosName);
 593
 594         RtlAcquirePebLock();
 595
 596         cd = (PCURDIR)&(NtCurrentPeb ()->ProcessParameters->CurrentDirectoryName);
 597 DPRINT("type %ld\n", type);
 598         switch (type)
 599         {
 600                 case 1:         /* \\xxx or \\.xxx */
 601                 case 6:         /* \\.\xxx */
 602                         break;
 603
 604                 case 2:         /* x:\xxx  */
 605                         *DosName = RtlUpcaseUnicodeChar (*DosName);
 606                         break;
 607
 608                 case 3:         /* x:xxx   */
 609                         drive = RtlUpcaseUnicodeChar (*DosName);
 610                         DosName += 2;
 611                         len     -= 2;
 612 CHECKPOINT;
 613                         if (drive == RtlUpcaseUnicodeChar (cd->DosPath.Buffer[0]))
 614                         {
 615 CHECKPOINT;
 616                                 memcpy (TempFullPathName, cd->DosPath.Buffer, cd->DosPath.Length);
 617                                 templen = cd->DosPath.Length / sizeof(WCHAR);
 618                         }
 619                         else
 620                         {
 621 CHECKPOINT;
 622                                 var[0] = L'=';
 623                                 var[1] = drive;
 624                                 var[2] = L':';
 625                                 var[3] = 0;
 626                                 usvar.Length = 3 * sizeof(WCHAR);
 627                                 usvar.MaximumLength = 4 * sizeof(WCHAR);
 628                                 usvar.Buffer = var;
 629                                 pfx.Length = 0;
 630                                 pfx.MaximumLength = MAX_PATH;
 631                                 pfx.Buffer = TempFullPathName;
 632                                 Status = RtlQueryEnvironmentVariable_U (NULL,
 633                                                                         &usvar,
 634                                                                         &pfx);
 635 CHECKPOINT;
 636                                 if (!NT_SUCCESS(Status))
 637                                 {
 638 CHECKPOINT;
 639                                         if (Status == STATUS_BUFFER_TOO_SMALL)
 640                                                 return pfx.Length + len * 2 + 2;
 641                                         memcpy (TempFullPathName, var, 6);
 642                                         templen = 3;
 643                                 }
 644                                 else
 645                                 {
 646                                         templen = pfx.Length / sizeof(WCHAR);
 647                                 }
 648
 649                         }
 650                         break;
 651
 652                 case 4:         /* \xxx    */
 653                         wcsncpy (TempFullPathName, cd->DosPath.Buffer, 2);
 654                         TempFullPathName[2] = 0;
 655                         templen = wcslen(TempFullPathName);
 656                         break;
 657
 658                 case 5:         /* xxx     */
 659                         memcpy (TempFullPathName, cd->DosPath.Buffer, cd->DosPath.Length);
 660                         templen = cd->DosPath.Length / sizeof(WCHAR);
 661                         break;
 662
 663                 case 7:         /* \\.     */
 664                         memcpy (TempFullPathName, L"\\\\.\\", 8);
 665                         templen = 4;
 666                         break;
 667
 668                 default:
 669                         return 0;
 670         }
 671
 672         RtlReleasePebLock();
 673
 674         DPRINT("TempFullPathName \'%S\' DosName \'%S\' len %ld\n", TempFullPathName, DosName, len);
 675         /* add dosname to prefix */
 676         memcpy (TempFullPathName + templen, DosName, len * sizeof(WCHAR));
 677         len += templen;
 678         TempFullPathName[len] = 0;
 679
 680         CHECKPOINT;
 681         /* replace slashes */
 682         wcs = wcschr(TempFullPathName, L'/');
 683         while(wcs)
 684         {
 685             *wcs = L'\\';
 686             wcs = wcschr(wcs + 1, L'/');
 687         }
 688
 689         if (len == 2 && TempFullPathName[1] == L':')
 690         {
 691                 TempFullPathName[len++] = L'\\';
 692                 TempFullPathName[len] = 0;
 693         }
 694
 695
 696         DPRINT("TempFullPathName \'%S\'\n", TempFullPathName);
 697         RtlpEatPath (TempFullPathName);
 698         DPRINT("TempFullPathName \'%S\'\n", TempFullPathName);
 699
 700         len = wcslen (TempFullPathName);
 701
 702         if (len < (size / sizeof(WCHAR)))
 703         {
 704                 memcpy (buf, TempFullPathName, (len + 1) * sizeof(WCHAR));
 705
 706                 /* find file part */
 707                 if (FilePart)
 708                 {
 709                         *FilePart = wcsrchr(buf, L'\\');
 710                         if (*FilePart)
 711                         {
 712                             (*FilePart)++;
 713                         }
 714                         else
 715                         {
 716                             *FilePart = buf;
 717                         }
 718                 }
 719         }
 720
 721         return len * sizeof(WCHAR);
 722 }
 723
 724
 725 /*
 726  * @unimplemented
 727  */
 728 BOOLEAN STDCALL
 729 RtlDosPathNameToNtPathName_U(PWSTR dosname,
 730                              PUNICODE_STRING ntname,
 731                              PWSTR *FilePart,
 732                              PCURDIR nah)
 733 {
 734         UNICODE_STRING  us;
 735         PCURDIR cd;
 736         ULONG Type;
 737         ULONG Size;
 738         ULONG Length;
 739         ULONG tmpLength;
 740         ULONG Offset;
 741         WCHAR fullname[MAX_PATH + 1];
 742         PWSTR Buffer = NULL;
 743
 744         RtlAcquirePebLock ();
 745
 746         RtlInitUnicodeString (&us, dosname);
 747         if (us.Length > 8)
 748         {
 749                 Buffer = us.Buffer;
 750                 /* check for "\\?\" - allows to use very long filenames ( up to 32k ) */
 751                 if (Buffer[0] == L'\\' && Buffer[1] == L'\\' &&
 752                     Buffer[2] == L'?' && Buffer[3] == L'\\')
 753                 {
 754 //                      if( f_77F68606( &us, ntname, shortname, nah ) )
 755 //                      {
 756 //                              RtlReleasePebLock ();
 757 //                              return TRUE;
 758 //                      }
 759                         Buffer = NULL;
 760                         RtlReleasePebLock ();
 761                         return FALSE;
 762                 }
 763         }
 764
 765         Buffer = RtlAllocateHeap (RtlGetProcessHeap (),
 766                                   0,
 767                                   sizeof( fullname ) + MAX_PFX_SIZE);
 768         if (Buffer == NULL)
 769         {
 770                 RtlReleasePebLock ();
 771                 return FALSE;
 772         }
 773
 774         Size = RtlGetFullPathName_U (dosname,
 775                                      sizeof(fullname),
 776                                      fullname,
 777                                      FilePart);
 778         if (Size == 0 || Size > MAX_PATH * sizeof(WCHAR))
 779         {
 780                 RtlFreeHeap (RtlGetProcessHeap (),
 781                              0,
 782                              Buffer);
 783                 RtlReleasePebLock ();
 784                 return FALSE;
 785         }
 786
 787         /* Set NT prefix */
 788         Offset = 0;
 789         memcpy (Buffer, L"\\??\\", 4 * sizeof(WCHAR));
 790         tmpLength = 4;
 791
 792         Type = RtlDetermineDosPathNameType_U (fullname);
 793         switch (Type)
 794         {
 795                 case 1:
 796                         memcpy (Buffer + tmpLength, L"UNC\\", 4 * sizeof(WCHAR));
 797                         tmpLength += 4;
 798                         Offset = 2;
 799                         break; /* \\xxx   */
 800
 801                 case 6:
 802                         Offset = 4;
 803                         break; /* \\.\xxx */
 804         }
 805         Length = wcslen(fullname + Offset);
 806         memcpy (Buffer + tmpLength, fullname + Offset, (Length + 1) * sizeof(WCHAR));
 807         Length += tmpLength;
 808
 809         /* set NT filename */
 810         ntname->Length        = Length * sizeof(WCHAR);
 811         ntname->MaximumLength = sizeof(fullname) + MAX_PFX_SIZE;
 812         ntname->Buffer        = Buffer;
 813
 814         /* set pointer to file part if possible */
 815         if (FilePart && *FilePart)
 816                 *FilePart = Buffer + Length - wcslen (*FilePart);
 817
 818         /* Set name and handle structure if possible */
 819         if (nah)
 820         {
 821                 memset (nah, 0, sizeof(CURDIR));
 822                 cd = (PCURDIR)&(NtCurrentPeb ()->ProcessParameters->CurrentDirectoryName);
 823                 if (Type == 5 && cd->Handle)
 824                 {
 825                     RtlInitUnicodeString(&us, fullname);
 826                     if (RtlEqualUnicodeString(&us, &cd->DosPath, TRUE))
 827                     {
 828                         Length = ((cd->DosPath.Length / sizeof(WCHAR)) - Offset) + ((Type == 1) ? 8 : 4);
 829                         nah->DosPath.Buffer = Buffer + Length;
 830                         nah->DosPath.Length = ntname->Length - (Length * sizeof(WCHAR));
 831                         nah->DosPath.MaximumLength = nah->DosPath.Length;
 832                         nah->Handle = cd->Handle;
 833                     }
 834                 }
 835         }
 836
 837         RtlReleasePebLock();
 838
 839         return TRUE;
 840 }
 841
 842
 843 /*
 844  * @implemented
 845  */
 846 ULONG
 847 STDCALL
 848 RtlDosSearchPath_U (
 849         WCHAR *sp,
 850         WCHAR *name,
 851         WCHAR *ext,
 852         ULONG buf_sz,
 853         WCHAR *buffer,
 854         PWSTR *FilePart
 855         )
 856 {
 857         ULONG Type;
 858         ULONG Length = 0;
 859         PWSTR full_name;
 860         PWSTR wcs;
 861         PWSTR path;
 862
 863         Type = RtlDetermineDosPathNameType_U (name);
 864
 865         if (Type == 5)
 866         {
 867                 Length = wcslen (sp);
 868                 Length += wcslen (name);
 869                 if (wcschr (name, L'.'))
 870                         ext = NULL;
 871                 if (ext != NULL)
 872                         Length += wcslen (ext);
 873
 874                 full_name = (WCHAR*)RtlAllocateHeap (RtlGetProcessHeap (),
 875                                                      0,
 876                                                      (Length + 1) * sizeof(WCHAR));
 877                 Length = 0;
 878                 if (full_name != NULL)
 879                 {
 880                         path = sp;
 881                         while (*path)
 882                         {
 883                                 wcs = full_name;
 884                                 while (*path && *path != L';')
 885                                         *wcs++ = *path++;
 886                                 if (*path)
 887                                         path++;
 888                                 if (wcs != full_name && *(wcs - 1) != L'\\')
 889                                         *wcs++ = L'\\';
 890                                 wcscpy (wcs, name);
 891                                 if (ext)
 892                                         wcscat (wcs, ext);
 893                                 if (RtlDoesFileExists_U (full_name))
 894                                 {
 895                                         Length = RtlGetFullPathName_U (full_name,
 896                                                                        buf_sz,
 897                                                                        buffer,
 898                                                                        FilePart);
 899                                         break;
 900                                 }
 901                         }
 902
 903                         RtlFreeHeap (RtlGetProcessHeap (),
 904                                      0,
 905                                      full_name);
 906                 }
 907         }
 908         else if (RtlDoesFileExists_U (name))
 909         {
 910                 Length = RtlGetFullPathName_U (name,
 911                                                buf_sz,
 912                                                buffer,
 913                                                FilePart);
 914         }
 915
 916         return Length;
 917 }
 918
 919
 920 /*
 921  * @unimplemented
 922  */
 923 BOOLEAN STDCALL
 924 RtlDoesFileExists_U(IN PWSTR FileName)
 925 {
 926         UNICODE_STRING NtFileName;
 927         OBJECT_ATTRIBUTES Attr;
 928         NTSTATUS Status;
 929         CURDIR CurDir;
 930         PWSTR Buffer;
 931
 932         /* only used by replacement code */
 933         HANDLE FileHandle;
 934         IO_STATUS_BLOCK StatusBlock;
 935
 936         if (!RtlDosPathNameToNtPathName_U (FileName,
 937                                            &NtFileName,
 938                                            NULL,
 939                                            &CurDir))
 940                 return FALSE;
 941
 942         /* don't forget to free it! */
 943         Buffer = NtFileName.Buffer;
 944
 945         if (CurDir.DosPath.Length)
 946                 NtFileName = CurDir.DosPath;
 947         else
 948                 CurDir.Handle = 0;
 949
 950         InitializeObjectAttributes (&Attr,
 951                                     &NtFileName,
 952                                     OBJ_CASE_INSENSITIVE,
 953                                     CurDir.Handle,
 954                                     NULL);
 955
 956         /* FIXME: not implemented yet */
 957 //      Status = NtQueryAttributesFile (&Attr, NULL);
 958
 959         /* REPLACEMENT start */
 960         Status = NtOpenFile (&FileHandle,
 961                              0x10001,
 962                              &Attr,
 963                              &StatusBlock,
 964                              1,
 965                              FILE_SYNCHRONOUS_IO_NONALERT);
 966         if (NT_SUCCESS(Status))
 967                 NtClose (FileHandle);
 968         /* REPLACEMENT end */
 969
 970         RtlFreeHeap (RtlGetProcessHeap (),
 971                      0,
 972                      Buffer);
 973
 974         if (NT_SUCCESS(Status) ||
 975             Status == STATUS_SHARING_VIOLATION ||
 976             Status == STATUS_ACCESS_DENIED)
 977                 return TRUE;
 978
 979         return FALSE;
 980 }
 981
 982 /* EOF */