dlls/ntdll/path.c

   1 /*
   2  * Ntdll path functions
   3  *
   4  * Copyright 2002, 2003, 2004 Alexandre Julliard
   5  * Copyright 2003 Eric Pouech
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <stdarg.h>
  23 #include <sys/types.h>
  24
  25 #include "ntstatus.h"
  26 #define WIN32_NO_STATUS
  27 #include "windef.h"
  28 #include "winioctl.h"
  29 #include "wine/debug.h"
  30 #include "ntdll_misc.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(file);
  33
  34 #define IS_SEPARATOR(ch)  ((ch) == '\\' || (ch) == '/')
  35
  36 /***********************************************************************
  37  *             RtlDetermineDosPathNameType_U   (NTDLL.@)
  38  */
  39 DOS_PATHNAME_TYPE WINAPI RtlDetermineDosPathNameType_U( PCWSTR path )
  40 {
  41     if (IS_SEPARATOR(path[0]))
  42     {
  43         if (!IS_SEPARATOR(path[1])) return ABSOLUTE_PATH;       /* "/foo" */
  44         if (path[2] != '.' && path[2] != '?') return UNC_PATH;  /* "//foo" */
  45         if (IS_SEPARATOR(path[3])) return DEVICE_PATH;          /* "//./foo" or "//?/foo" */
  46         if (path[3]) return UNC_PATH;                           /* "//.foo" or "//?foo" */
  47         return UNC_DOT_PATH;                                    /* "//." or "//?" */
  48     }
  49     else
  50     {
  51         if (!path[0] || path[1] != ':') return RELATIVE_PATH;   /* "foo" */
  52         if (IS_SEPARATOR(path[2])) return ABSOLUTE_DRIVE_PATH;  /* "c:/foo" */
  53         return RELATIVE_DRIVE_PATH;                             /* "c:foo" */
  54     }
  55 }
  56
  57 /***********************************************************************
  58  *             RtlIsDosDeviceName_U   (NTDLL.@)
  59  *
  60  * Check if the given DOS path contains a DOS device name.
  61  *
  62  * Returns the length of the device name in the low word and its
  63  * position in the high word (both in bytes, not WCHARs), or 0 if no
  64  * device name is found.
  65  */
  66 ULONG WINAPI RtlIsDosDeviceName_U( PCWSTR dos_name )
  67 {
  68     static const WCHAR auxW[] = {'A','U','X'};
  69     static const WCHAR comW[] = {'C','O','M'};
  70     static const WCHAR conW[] = {'C','O','N'};
  71     static const WCHAR lptW[] = {'L','P','T'};
  72     static const WCHAR nulW[] = {'N','U','L'};
  73     static const WCHAR prnW[] = {'P','R','N'};
  74     static const WCHAR coninW[]  = {'C','O','N','I','N','$'};
  75     static const WCHAR conoutW[] = {'C','O','N','O','U','T','$'};
  76
  77     const WCHAR *start, *end, *p;
  78
  79     switch(RtlDetermineDosPathNameType_U( dos_name ))
  80     {
  81     case INVALID_PATH:
  82     case UNC_PATH:
  83         return 0;
  84     case DEVICE_PATH:
  85         if (!wcsicmp( dos_name, L"\\\\.\\CON" ))
  86             return MAKELONG( sizeof(conW), 4 * sizeof(WCHAR) );  /* 4 is length of \\.\ prefix */
  87         return 0;
  88     case ABSOLUTE_DRIVE_PATH:
  89     case RELATIVE_DRIVE_PATH:
  90         start = dos_name + 2;  /* skip drive letter */
  91         break;
  92     default:
  93         start = dos_name;
  94         break;
  95     }
  96
  97     /* find start of file name */
  98     for (p = start; *p; p++) if (IS_SEPARATOR(*p)) start = p + 1;
  99
 100     /* truncate at extension and ':' */
 101     for (end = start; *end; end++) if (*end == '.' || *end == ':') break;
 102     end--;
 103
 104     /* remove trailing spaces */
 105     while (end >= start && *end == ' ') end--;
 106
 107     /* now we have a potential device name between start and end, check it */
 108     switch(end - start + 1)
 109     {
 110     case 3:
 111         if (wcsnicmp( start, auxW, 3 ) &&
 112             wcsnicmp( start, conW, 3 ) &&
 113             wcsnicmp( start, nulW, 3 ) &&
 114             wcsnicmp( start, prnW, 3 )) break;
 115         return MAKELONG( 3 * sizeof(WCHAR), (start - dos_name) * sizeof(WCHAR) );
 116     case 4:
 117         if (wcsnicmp( start, comW, 3 ) && wcsnicmp( start, lptW, 3 )) break;
 118         if (*end <= '0' || *end > '9') break;
 119         return MAKELONG( 4 * sizeof(WCHAR), (start - dos_name) * sizeof(WCHAR) );
 120     case 6:
 121         if (wcsnicmp( start, coninW, ARRAY_SIZE(coninW) )) break;
 122         return MAKELONG( sizeof(coninW), (start - dos_name) * sizeof(WCHAR) );
 123     case 7:
 124         if (wcsnicmp( start, conoutW, ARRAY_SIZE(conoutW) )) break;
 125         return MAKELONG( sizeof(conoutW), (start - dos_name) * sizeof(WCHAR) );
 126     default:  /* can't match anything */
 127         break;
 128     }
 129     return 0;
 130 }
 131
 132 /**************************************************************************
 133  *                 RtlDosPathNameToNtPathName_U_WithStatus    [NTDLL.@]
 134  *
 135  * dos_path: a DOS path name (fully qualified or not)
 136  * ntpath:   pointer to a UNICODE_STRING to hold the converted
 137  *           path name
 138  * file_part:will point (in ntpath) to the file part in the path
 139  * cd:       directory reference (optional)
 140  *
 141  * FIXME:
 142  *      + fill the cd structure
 143  */
 144 NTSTATUS WINAPI RtlDosPathNameToNtPathName_U_WithStatus(const WCHAR *dos_path, UNICODE_STRING *ntpath,
 145     WCHAR **file_part, CURDIR *cd)
 146 {
 147     static const WCHAR global_prefix[] = {'\\','\\','?','\\'};
 148     static const WCHAR global_prefix2[] = {'\\','?','?','\\'};
 149     ULONG sz, offset;
 150     WCHAR local[MAX_PATH];
 151     LPWSTR ptr;
 152
 153     TRACE("(%s,%p,%p,%p)\n", debugstr_w(dos_path), ntpath, file_part, cd);
 154
 155     if (cd)
 156     {
 157         FIXME("Unsupported parameter\n");
 158         memset(cd, 0, sizeof(*cd));
 159     }
 160
 161     if (!dos_path || !*dos_path)
 162         return STATUS_OBJECT_NAME_INVALID;
 163
 164     if (!memcmp(dos_path, global_prefix, sizeof(global_prefix)) ||
 165         (!memcmp(dos_path, global_prefix2, sizeof(global_prefix2)) && dos_path[4]))
 166     {
 167         ntpath->Length = wcslen(dos_path) * sizeof(WCHAR);
 168         ntpath->MaximumLength = ntpath->Length + sizeof(WCHAR);
 169         ntpath->Buffer = RtlAllocateHeap(GetProcessHeap(), 0, ntpath->MaximumLength);
 170         if (!ntpath->Buffer) return STATUS_NO_MEMORY;
 171         memcpy( ntpath->Buffer, dos_path, ntpath->MaximumLength );
 172         ntpath->Buffer[1] = '?';  /* change \\?\ to \??\ */
 173         if (file_part)
 174         {
 175             if ((ptr = wcsrchr( ntpath->Buffer, '\\' )) && ptr[1]) *file_part = ptr + 1;
 176             else *file_part = NULL;
 177         }
 178         return STATUS_SUCCESS;
 179     }
 180
 181     ptr = local;
 182     sz = RtlGetFullPathName_U(dos_path, sizeof(local), ptr, file_part);
 183     if (sz == 0) return STATUS_OBJECT_NAME_INVALID;
 184
 185     if (sz > sizeof(local))
 186     {
 187         if (!(ptr = RtlAllocateHeap(GetProcessHeap(), 0, sz))) return STATUS_NO_MEMORY;
 188         sz = RtlGetFullPathName_U(dos_path, sz, ptr, file_part);
 189     }
 190     sz += (1 /* NUL */ + 4 /* unc\ */ + 4 /* \??\ */) * sizeof(WCHAR);
 191     if (sz > MAXWORD)
 192     {
 193         if (ptr != local) RtlFreeHeap(GetProcessHeap(), 0, ptr);
 194         return STATUS_OBJECT_NAME_INVALID;
 195     }
 196
 197     ntpath->MaximumLength = sz;
 198     ntpath->Buffer = RtlAllocateHeap(GetProcessHeap(), 0, ntpath->MaximumLength);
 199     if (!ntpath->Buffer)
 200     {
 201         if (ptr != local) RtlFreeHeap(GetProcessHeap(), 0, ptr);
 202         return STATUS_NO_MEMORY;
 203     }
 204
 205     wcscpy(ntpath->Buffer, L"\\??\\");
 206     switch (RtlDetermineDosPathNameType_U(ptr))
 207     {
 208     case UNC_PATH: /* \\foo */
 209         offset = 2;
 210         wcscat(ntpath->Buffer, L"UNC\\");
 211         break;
 212     case DEVICE_PATH: /* \\.\foo */
 213         offset = 4;
 214         break;
 215     default:
 216         offset = 0;
 217         break;
 218     }
 219
 220     wcscat(ntpath->Buffer, ptr + offset);
 221     ntpath->Length = wcslen(ntpath->Buffer) * sizeof(WCHAR);
 222
 223     if (file_part && *file_part)
 224         *file_part = ntpath->Buffer + ntpath->Length / sizeof(WCHAR) - wcslen(*file_part);
 225
 226     /* FIXME: cd filling */
 227
 228     if (ptr != local) RtlFreeHeap(GetProcessHeap(), 0, ptr);
 229     return STATUS_SUCCESS;
 230 }
 231
 232 /**************************************************************************
 233  *                 RtlDosPathNameToNtPathName_U    [NTDLL.@]
 234  *
 235  * See RtlDosPathNameToNtPathName_U_WithStatus
 236  */
 237 BOOLEAN  WINAPI RtlDosPathNameToNtPathName_U(PCWSTR dos_path,
 238                                              PUNICODE_STRING ntpath,
 239                                              PWSTR* file_part,
 240                                              CURDIR* cd)
 241 {
 242     return RtlDosPathNameToNtPathName_U_WithStatus(dos_path, ntpath, file_part, cd) == STATUS_SUCCESS;
 243 }
 244
 245 /**************************************************************************
 246  *        RtlDosPathNameToRelativeNtPathName_U_WithStatus [NTDLL.@]
 247  *
 248  * See RtlDosPathNameToNtPathName_U_WithStatus (except the last parameter)
 249  */
 250 NTSTATUS WINAPI RtlDosPathNameToRelativeNtPathName_U_WithStatus(const WCHAR *dos_path,
 251     UNICODE_STRING *ntpath, WCHAR **file_part, RTL_RELATIVE_NAME *relative)
 252 {
 253     TRACE("(%s,%p,%p,%p)\n", debugstr_w(dos_path), ntpath, file_part, relative);
 254
 255     if (relative)
 256     {
 257         FIXME("Unsupported parameter\n");
 258         memset(relative, 0, sizeof(*relative));
 259     }
 260
 261     /* FIXME: fill parameter relative */
 262
 263     return RtlDosPathNameToNtPathName_U_WithStatus(dos_path, ntpath, file_part, NULL);
 264 }
 265
 266 /**************************************************************************
 267  *        RtlReleaseRelativeName [NTDLL.@]
 268  */
 269 void WINAPI RtlReleaseRelativeName(RTL_RELATIVE_NAME *relative)
 270 {
 271 }
 272
 273 /******************************************************************
 274  *              RtlDosSearchPath_U
 275  *
 276  * Searches a file of name 'name' into a ';' separated list of paths
 277  * (stored in paths)
 278  * Doesn't seem to search elsewhere than the paths list
 279  * Stores the result in buffer (file_part will point to the position
 280  * of the file name in the buffer)
 281  * FIXME:
 282  * - how long shall the paths be ??? (MAX_PATH or larger with \\?\ constructs ???)
 283  */
 284 ULONG WINAPI RtlDosSearchPath_U(LPCWSTR paths, LPCWSTR search, LPCWSTR ext,
 285                                 ULONG buffer_size, LPWSTR buffer,
 286                                 LPWSTR* file_part)
 287 {
 288     DOS_PATHNAME_TYPE type = RtlDetermineDosPathNameType_U(search);
 289     ULONG len = 0;
 290
 291     if (type == RELATIVE_PATH)
 292     {
 293         ULONG allocated = 0, needed, filelen;
 294         WCHAR *name = NULL;
 295
 296         filelen = 1 /* for \ */ + wcslen(search) + 1 /* \0 */;
 297
 298         /* Windows only checks for '.' without worrying about path components */
 299         if (wcschr( search, '.' )) ext = NULL;
 300         if (ext != NULL) filelen += wcslen(ext);
 301
 302         while (*paths)
 303         {
 304             LPCWSTR ptr;
 305
 306             for (needed = 0, ptr = paths; *ptr != 0 && *ptr++ != ';'; needed++);
 307             if (needed + filelen > allocated)
 308             {
 309                 if (!name) name = RtlAllocateHeap(GetProcessHeap(), 0,
 310                                                   (needed + filelen) * sizeof(WCHAR));
 311                 else
 312                 {
 313                     WCHAR *newname = RtlReAllocateHeap(GetProcessHeap(), 0, name,
 314                                                        (needed + filelen) * sizeof(WCHAR));
 315                     if (!newname) RtlFreeHeap(GetProcessHeap(), 0, name);
 316                     name = newname;
 317                 }
 318                 if (!name) return 0;
 319                 allocated = needed + filelen;
 320             }
 321             memmove(name, paths, needed * sizeof(WCHAR));
 322             /* append '\\' if none is present */
 323             if (needed > 0 && name[needed - 1] != '\\') name[needed++] = '\\';
 324             wcscpy(&name[needed], search);
 325             if (ext) wcscat(&name[needed], ext);
 326             if (RtlDoesFileExists_U(name))
 327             {
 328                 len = RtlGetFullPathName_U(name, buffer_size, buffer, file_part);
 329                 break;
 330             }
 331             paths = ptr;
 332         }
 333         RtlFreeHeap(GetProcessHeap(), 0, name);
 334     }
 335     else if (RtlDoesFileExists_U(search))
 336     {
 337         len = RtlGetFullPathName_U(search, buffer_size, buffer, file_part);
 338     }
 339
 340     return len;
 341 }
 342
 343
 344 /******************************************************************
 345  *              collapse_path
 346  *
 347  * Helper for RtlGetFullPathName_U.
 348  * Get rid of . and .. components in the path.
 349  */
 350 static inline void collapse_path( WCHAR *path, UINT mark )
 351 {
 352     WCHAR *p, *next;
 353
 354     /* convert every / into a \ */
 355     for (p = path; *p; p++) if (*p == '/') *p = '\\';
 356
 357     /* collapse duplicate backslashes */
 358     next = path + max( 1, mark );
 359     for (p = next; *p; p++) if (*p != '\\' || next[-1] != '\\') *next++ = *p;
 360     *next = 0;
 361
 362     p = path + mark;
 363     while (*p)
 364     {
 365         if (*p == '.')
 366         {
 367             switch(p[1])
 368             {
 369             case '\\': /* .\ component */
 370                 next = p + 2;
 371                 memmove( p, next, (wcslen(next) + 1) * sizeof(WCHAR) );
 372                 continue;
 373             case 0:  /* final . */
 374                 if (p > path + mark) p--;
 375                 *p = 0;
 376                 continue;
 377             case '.':
 378                 if (p[2] == '\\')  /* ..\ component */
 379                 {
 380                     next = p + 3;
 381                     if (p > path + mark)
 382                     {
 383                         p--;
 384                         while (p > path + mark && p[-1] != '\\') p--;
 385                     }
 386                     memmove( p, next, (wcslen(next) + 1) * sizeof(WCHAR) );
 387                     continue;
 388                 }
 389                 else if (!p[2])  /* final .. */
 390                 {
 391                     if (p > path + mark)
 392                     {
 393                         p--;
 394                         while (p > path + mark && p[-1] != '\\') p--;
 395                         if (p > path + mark) p--;
 396                     }
 397                     *p = 0;
 398                     continue;
 399                 }
 400                 break;
 401             }
 402         }
 403         /* skip to the next component */
 404         while (*p && *p != '\\') p++;
 405         if (*p == '\\')
 406         {
 407             /* remove last dot in previous dir name */
 408             if (p > path + mark && p[-1] == '.') memmove( p-1, p, (wcslen(p) + 1) * sizeof(WCHAR) );
 409             else p++;
 410         }
 411     }
 412
 413     /* remove trailing spaces and dots (yes, Windows really does that, don't ask) */
 414     while (p > path + mark && (p[-1] == ' ' || p[-1] == '.')) p--;
 415     *p = 0;
 416 }
 417
 418
 419 /******************************************************************
 420  *              skip_unc_prefix
 421  *
 422  * Skip the \\share\dir\ part of a file name. Helper for RtlGetFullPathName_U.
 423  */
 424 static const WCHAR *skip_unc_prefix( const WCHAR *ptr )
 425 {
 426     ptr += 2;
 427     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* share name */
 428     while (IS_SEPARATOR(*ptr)) ptr++;
 429     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* dir name */
 430     while (IS_SEPARATOR(*ptr)) ptr++;
 431     return ptr;
 432 }
 433
 434
 435 /******************************************************************
 436  *              get_full_path_helper
 437  *
 438  * Helper for RtlGetFullPathName_U
 439  * Note: name and buffer are allowed to point to the same memory spot
 440  */
 441 static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
 442 {
 443     ULONG                       reqsize = 0, mark = 0, dep = 0, deplen;
 444     LPWSTR                      ins_str = NULL;
 445     LPCWSTR                     ptr;
 446     const UNICODE_STRING*       cd;
 447     WCHAR                       tmp[4];
 448
 449     /* return error if name only consists of spaces */
 450     for (ptr = name; *ptr; ptr++) if (*ptr != ' ') break;
 451     if (!*ptr) return 0;
 452
 453     RtlAcquirePebLock();
 454
 455     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 456         cd = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 457     else
 458         cd = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 459
 460     switch (RtlDetermineDosPathNameType_U(name))
 461     {
 462     case UNC_PATH:              /* \\foo   */
 463         ptr = skip_unc_prefix( name );
 464         mark = (ptr - name);
 465         break;
 466
 467     case DEVICE_PATH:           /* \\.\foo */
 468         mark = 4;
 469         break;
 470
 471     case ABSOLUTE_DRIVE_PATH:   /* c:\foo  */
 472         reqsize = sizeof(WCHAR);
 473         tmp[0] = name[0];
 474         ins_str = tmp;
 475         dep = 1;
 476         mark = 3;
 477         break;
 478
 479     case RELATIVE_DRIVE_PATH:   /* c:foo   */
 480         dep = 2;
 481         if (wcsnicmp( name, cd->Buffer, 2 ))
 482         {
 483             UNICODE_STRING      var, val;
 484
 485             tmp[0] = '=';
 486             tmp[1] = name[0];
 487             tmp[2] = ':';
 488             tmp[3] = '\0';
 489             var.Length = 3 * sizeof(WCHAR);
 490             var.MaximumLength = 4 * sizeof(WCHAR);
 491             var.Buffer = tmp;
 492             val.Length = 0;
 493             val.MaximumLength = size;
 494             val.Buffer = RtlAllocateHeap(GetProcessHeap(), 0, size);
 495
 496             switch (RtlQueryEnvironmentVariable_U(NULL, &var, &val))
 497             {
 498             case STATUS_SUCCESS:
 499                 /* FIXME: Win2k seems to check that the environment variable actually points
 500                  * to an existing directory. If not, root of the drive is used
 501                  * (this seems also to be the only spot in RtlGetFullPathName that the
 502                  * existence of a part of a path is checked)
 503                  */
 504                 /* fall through */
 505             case STATUS_BUFFER_TOO_SMALL:
 506                 reqsize = val.Length + sizeof(WCHAR); /* append trailing '\\' */
 507                 val.Buffer[val.Length / sizeof(WCHAR)] = '\\';
 508                 ins_str = val.Buffer;
 509                 break;
 510             case STATUS_VARIABLE_NOT_FOUND:
 511                 reqsize = 3 * sizeof(WCHAR);
 512                 tmp[0] = name[0];
 513                 tmp[1] = ':';
 514                 tmp[2] = '\\';
 515                 ins_str = tmp;
 516                 RtlFreeHeap(GetProcessHeap(), 0, val.Buffer);
 517                 break;
 518             default:
 519                 ERR("Unsupported status code\n");
 520                 RtlFreeHeap(GetProcessHeap(), 0, val.Buffer);
 521                 break;
 522             }
 523             mark = 3;
 524             break;
 525         }
 526         /* fall through */
 527
 528     case RELATIVE_PATH:         /* foo     */
 529         reqsize = cd->Length;
 530         ins_str = cd->Buffer;
 531         if (cd->Buffer[1] != ':')
 532         {
 533             ptr = skip_unc_prefix( cd->Buffer );
 534             mark = ptr - cd->Buffer;
 535         }
 536         else mark = 3;
 537         break;
 538
 539     case ABSOLUTE_PATH:         /* \xxx    */
 540         if (name[0] == '/')  /* may be a Unix path */
 541         {
 542             char *unix_name;
 543             WCHAR *nt_str;
 544             SIZE_T buflen;
 545             NTSTATUS status;
 546             UNICODE_STRING str;
 547
 548             nt_str = RtlAllocateHeap( GetProcessHeap(), 0, (wcslen(name) + 9) * sizeof(WCHAR) );
 549             wcscpy( nt_str, L"\\??\\unix" );
 550             wcscat( nt_str, name );
 551             RtlInitUnicodeString( &str, nt_str );
 552             buflen = 3 * wcslen(name) + 1;
 553             unix_name = RtlAllocateHeap( GetProcessHeap(), 0, buflen );
 554             status = wine_nt_to_unix_file_name( &str, unix_name, &buflen, FILE_OPEN_IF );
 555             if (!status || status == STATUS_NO_SUCH_FILE)
 556             {
 557                 buflen = wcslen(name) + 9;
 558                 status = wine_unix_to_nt_file_name( unix_name, nt_str, &buflen );
 559             }
 560             RtlFreeHeap( GetProcessHeap(), 0, unix_name );
 561             if (!status && buflen > 6 && nt_str[5] == ':')
 562             {
 563                 reqsize = (buflen - 4) * sizeof(WCHAR);
 564                 if (reqsize <= size)
 565                 {
 566                     memcpy( buffer, nt_str + 4, reqsize );
 567                     collapse_path( buffer, 3 );
 568                     reqsize -= sizeof(WCHAR);
 569                 }
 570                 RtlFreeHeap( GetProcessHeap(), 0, nt_str );
 571                 goto done;
 572             }
 573             RtlFreeHeap( GetProcessHeap(), 0, nt_str );
 574         }
 575         if (cd->Buffer[1] == ':')
 576         {
 577             reqsize = 2 * sizeof(WCHAR);
 578             tmp[0] = cd->Buffer[0];
 579             tmp[1] = ':';
 580             ins_str = tmp;
 581             mark = 3;
 582         }
 583         else
 584         {
 585             ptr = skip_unc_prefix( cd->Buffer );
 586             reqsize = (ptr - cd->Buffer) * sizeof(WCHAR);
 587             mark = reqsize / sizeof(WCHAR);
 588             ins_str = cd->Buffer;
 589         }
 590         break;
 591
 592     case UNC_DOT_PATH:         /* \\.     */
 593         reqsize = 4 * sizeof(WCHAR);
 594         dep = 3;
 595         tmp[0] = '\\';
 596         tmp[1] = '\\';
 597         tmp[2] = '.';
 598         tmp[3] = '\\';
 599         ins_str = tmp;
 600         mark = 4;
 601         break;
 602
 603     case INVALID_PATH:
 604         goto done;
 605     }
 606
 607     /* enough space ? */
 608     deplen = wcslen(name + dep) * sizeof(WCHAR);
 609     if (reqsize + deplen + sizeof(WCHAR) > size)
 610     {
 611         /* not enough space, return need size (including terminating '\0') */
 612         reqsize += deplen + sizeof(WCHAR);
 613         goto done;
 614     }
 615
 616     memmove(buffer + reqsize / sizeof(WCHAR), name + dep, deplen + sizeof(WCHAR));
 617     if (reqsize) memcpy(buffer, ins_str, reqsize);
 618
 619     if (ins_str != tmp && ins_str != cd->Buffer)
 620         RtlFreeHeap(GetProcessHeap(), 0, ins_str);
 621
 622     collapse_path( buffer, mark );
 623     reqsize = wcslen(buffer) * sizeof(WCHAR);
 624
 625 done:
 626     RtlReleasePebLock();
 627     return reqsize;
 628 }
 629
 630 /******************************************************************
 631  *              RtlGetFullPathName_U  (NTDLL.@)
 632  *
 633  * Returns the number of bytes written to buffer (not including the
 634  * terminating NULL) if the function succeeds, or the required number of bytes
 635  * (including the terminating NULL) if the buffer is too small.
 636  *
 637  * file_part will point to the filename part inside buffer (except if we use
 638  * DOS device name, in which case file_in_buf is NULL)
 639  *
 640  */
 641 DWORD WINAPI RtlGetFullPathName_U(const WCHAR* name, ULONG size, WCHAR* buffer,
 642                                   WCHAR** file_part)
 643 {
 644     WCHAR*      ptr;
 645     DWORD       dosdev;
 646     DWORD       reqsize;
 647
 648     TRACE("(%s %u %p %p)\n", debugstr_w(name), size, buffer, file_part);
 649
 650     if (!name || !*name) return 0;
 651
 652     if (file_part) *file_part = NULL;
 653
 654     /* check for DOS device name */
 655     dosdev = RtlIsDosDeviceName_U(name);
 656     if (dosdev)
 657     {
 658         DWORD   offset = HIWORD(dosdev) / sizeof(WCHAR); /* get it in WCHARs, not bytes */
 659         DWORD   sz = LOWORD(dosdev); /* in bytes */
 660
 661         if (8 + sz + 2 > size) return sz + 10;
 662         wcscpy(buffer, L"\\\\.\\");
 663         memmove(buffer + 4, name + offset, sz);
 664         buffer[4 + sz / sizeof(WCHAR)] = '\0';
 665         /* file_part isn't set in this case */
 666         return sz + 8;
 667     }
 668
 669     reqsize = get_full_path_helper(name, buffer, size);
 670     if (!reqsize) return 0;
 671     if (reqsize > size)
 672     {
 673         LPWSTR tmp = RtlAllocateHeap(GetProcessHeap(), 0, reqsize);
 674         reqsize = get_full_path_helper(name, tmp, reqsize);
 675         if (reqsize + sizeof(WCHAR) > size)  /* it may have worked the second time */
 676         {
 677             RtlFreeHeap(GetProcessHeap(), 0, tmp);
 678             return reqsize + sizeof(WCHAR);
 679         }
 680         memcpy( buffer, tmp, reqsize + sizeof(WCHAR) );
 681         RtlFreeHeap(GetProcessHeap(), 0, tmp);
 682     }
 683
 684     /* find file part */
 685     if (file_part && (ptr = wcsrchr(buffer, '\\')) != NULL && ptr >= buffer + 2 && *++ptr)
 686         *file_part = ptr;
 687     return reqsize;
 688 }
 689
 690 /*************************************************************************
 691  * RtlGetLongestNtPathLength    [NTDLL.@]
 692  *
 693  * Get the longest allowed path length
 694  *
 695  * PARAMS
 696  *  None.
 697  *
 698  * RETURNS
 699  *  The longest allowed path length (277 characters under Win2k).
 700  */
 701 DWORD WINAPI RtlGetLongestNtPathLength(void)
 702 {
 703     return MAX_NT_PATH_LENGTH;
 704 }
 705
 706 /******************************************************************
 707  *             RtlIsNameLegalDOS8Dot3   (NTDLL.@)
 708  *
 709  * Returns TRUE iff unicode is a valid DOS (8+3) name.
 710  * If the name is valid, oem gets filled with the corresponding OEM string
 711  * spaces is set to TRUE if unicode contains spaces
 712  */
 713 BOOLEAN WINAPI RtlIsNameLegalDOS8Dot3( const UNICODE_STRING *unicode,
 714                                        OEM_STRING *oem, BOOLEAN *spaces )
 715 {
 716     static const char illegal[] = "*?<>|\"+=,;[]:/\\\345";
 717     int dot = -1;
 718     int i;
 719     char buffer[12];
 720     OEM_STRING oem_str;
 721     BOOLEAN got_space = FALSE;
 722
 723     if (!oem)
 724     {
 725         oem_str.Length = sizeof(buffer);
 726         oem_str.MaximumLength = sizeof(buffer);
 727         oem_str.Buffer = buffer;
 728         oem = &oem_str;
 729     }
 730     if (RtlUpcaseUnicodeStringToCountedOemString( oem, unicode, FALSE ) != STATUS_SUCCESS)
 731         return FALSE;
 732
 733     if (oem->Length > 12) return FALSE;
 734
 735     /* a starting . is invalid, except for . and .. */
 736     if (oem->Length > 0 && oem->Buffer[0] == '.')
 737     {
 738         if (oem->Length != 1 && (oem->Length != 2 || oem->Buffer[1] != '.')) return FALSE;
 739         if (spaces) *spaces = FALSE;
 740         return TRUE;
 741     }
 742
 743     for (i = 0; i < oem->Length; i++)
 744     {
 745         switch (oem->Buffer[i])
 746         {
 747         case ' ':
 748             /* leading/trailing spaces not allowed */
 749             if (!i || i == oem->Length-1 || oem->Buffer[i+1] == '.') return FALSE;
 750             got_space = TRUE;
 751             break;
 752         case '.':
 753             if (dot != -1) return FALSE;
 754             dot = i;
 755             break;
 756         default:
 757             if (strchr(illegal, oem->Buffer[i])) return FALSE;
 758             break;
 759         }
 760     }
 761     /* check file part is shorter than 8, extension shorter than 3
 762      * dot cannot be last in string
 763      */
 764     if (dot == -1)
 765     {
 766         if (oem->Length > 8) return FALSE;
 767     }
 768     else
 769     {
 770         if (dot > 8 || (oem->Length - dot > 4) || dot == oem->Length - 1) return FALSE;
 771     }
 772     if (spaces) *spaces = got_space;
 773     return TRUE;
 774 }
 775
 776 /******************************************************************
 777  *              RtlGetCurrentDirectory_U (NTDLL.@)
 778  *
 779  */
 780 ULONG WINAPI RtlGetCurrentDirectory_U(ULONG buflen, LPWSTR buf)
 781 {
 782     UNICODE_STRING*     us;
 783     ULONG               len;
 784
 785     TRACE("(%u %p)\n", buflen, buf);
 786
 787     RtlAcquirePebLock();
 788
 789     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 790         us = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 791     else
 792         us = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 793
 794     len = us->Length / sizeof(WCHAR);
 795     if (us->Buffer[len - 1] == '\\' && us->Buffer[len - 2] != ':')
 796         len--;
 797
 798     if (buflen / sizeof(WCHAR) > len)
 799     {
 800         memcpy(buf, us->Buffer, len * sizeof(WCHAR));
 801         buf[len] = '\0';
 802     }
 803     else
 804     {
 805         len++;
 806     }
 807
 808     RtlReleasePebLock();
 809
 810     return len * sizeof(WCHAR);
 811 }
 812
 813 /******************************************************************
 814  *              RtlSetCurrentDirectory_U (NTDLL.@)
 815  *
 816  */
 817 NTSTATUS WINAPI RtlSetCurrentDirectory_U(const UNICODE_STRING* dir)
 818 {
 819     FILE_FS_DEVICE_INFORMATION device_info;
 820     OBJECT_ATTRIBUTES attr;
 821     UNICODE_STRING newdir;
 822     IO_STATUS_BLOCK io;
 823     CURDIR *curdir;
 824     HANDLE handle;
 825     NTSTATUS nts;
 826     ULONG size;
 827     PWSTR ptr;
 828
 829     newdir.Buffer = NULL;
 830
 831     RtlAcquirePebLock();
 832
 833     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 834         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir;
 835     else
 836         curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory;
 837
 838     if (!RtlDosPathNameToNtPathName_U( dir->Buffer, &newdir, NULL, NULL ))
 839     {
 840         nts = STATUS_OBJECT_NAME_INVALID;
 841         goto out;
 842     }
 843
 844     attr.Length = sizeof(attr);
 845     attr.RootDirectory = 0;
 846     attr.Attributes = OBJ_CASE_INSENSITIVE;
 847     attr.ObjectName = &newdir;
 848     attr.SecurityDescriptor = NULL;
 849     attr.SecurityQualityOfService = NULL;
 850
 851     nts = NtOpenFile( &handle, FILE_TRAVERSE | SYNCHRONIZE, &attr, &io, FILE_SHARE_READ | FILE_SHARE_WRITE,
 852                       FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT );
 853     if (nts != STATUS_SUCCESS) goto out;
 854
 855     /* don't keep the directory handle open on removable media */
 856     if (!NtQueryVolumeInformationFile( handle, &io, &device_info,
 857                                        sizeof(device_info), FileFsDeviceInformation ) &&
 858         (device_info.Characteristics & FILE_REMOVABLE_MEDIA))
 859     {
 860         NtClose( handle );
 861         handle = 0;
 862     }
 863
 864     if (curdir->Handle) NtClose( curdir->Handle );
 865     curdir->Handle = handle;
 866
 867     /* append trailing \ if missing */
 868     size = newdir.Length / sizeof(WCHAR);
 869     ptr = newdir.Buffer;
 870     ptr += 4;  /* skip \??\ prefix */
 871     size -= 4;
 872     if (size && ptr[size - 1] != '\\') ptr[size++] = '\\';
 873
 874     /* convert \??\UNC\ path to \\ prefix */
 875     if (size >= 4 && !wcsnicmp(ptr, L"UNC\\", 4))
 876     {
 877         ptr += 2;
 878         size -= 2;
 879         *ptr = '\\';
 880     }
 881
 882     memcpy( curdir->DosPath.Buffer, ptr, size * sizeof(WCHAR));
 883     curdir->DosPath.Buffer[size] = 0;
 884     curdir->DosPath.Length = size * sizeof(WCHAR);
 885
 886     TRACE( "curdir now %s %p\n", debugstr_w(curdir->DosPath.Buffer), curdir->Handle );
 887
 888  out:
 889     RtlFreeUnicodeString( &newdir );
 890     RtlReleasePebLock();
 891     return nts;
 892 }