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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "config.h"
  23
  24 #include <stdarg.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "winreg.h"
  31 #include "winternl.h"
  32 #include "winioctl.h"
  33 #include "wine/unicode.h"
  34 #include "wine/debug.h"
  35 #include "wine/library.h"
  36 #include "ntdll_misc.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(file);
  39
  40 static const WCHAR DeviceRootW[] = {'\\','\\','.','\\',0};
  41 static const WCHAR NTDosPrefixW[] = {'\\','?','?','\\',0};
  42 static const WCHAR UncPfxW[] = {'U','N','C','\\',0};
  43
  44 #define IS_SEPARATOR(ch)  ((ch) == '\\' || (ch) == '/')
  45
  46 #define MAX_DOS_DRIVES 26
  47
  48 struct drive_info
  49 {
  50     dev_t dev;
  51     ino_t ino;
  52 };
  53
  54 /***********************************************************************
  55  *           get_drives_info
  56  *
  57  * Retrieve device/inode number for all the drives. Helper for find_drive_root.
  58  */
  59 static inline int get_drives_info( struct drive_info info[MAX_DOS_DRIVES] )
  60 {
  61     const char *config_dir = wine_get_config_dir();
  62     char *buffer, *p;
  63     struct stat st;
  64     int i, ret;
  65
  66     buffer = RtlAllocateHeap( GetProcessHeap(), 0, strlen(config_dir) + sizeof("/dosdevices/a:") );
  67     if (!buffer) return 0;
  68     strcpy( buffer, config_dir );
  69     strcat( buffer, "/dosdevices/a:" );
  70     p = buffer + strlen(buffer) - 2;
  71
  72     for (i = ret = 0; i < MAX_DOS_DRIVES; i++)
  73     {
  74         *p = 'a' + i;
  75         if (!stat( buffer, &st ))
  76         {
  77             info[i].dev = st.st_dev;
  78             info[i].ino = st.st_ino;
  79             ret++;
  80         }
  81         else
  82         {
  83             info[i].dev = 0;
  84             info[i].ino = 0;
  85         }
  86     }
  87     RtlFreeHeap( GetProcessHeap(), 0, buffer );
  88     return ret;
  89 }
  90
  91
  92 /***********************************************************************
  93  *           remove_last_component
  94  *
  95  * Remove the last component of the path. Helper for find_drive_root.
  96  */
  97 static inline int remove_last_component( const WCHAR *path, int len )
  98 {
  99     int level = 0;
 100
 101     while (level < 1)
 102     {
 103         /* find start of the last path component */
 104         int prev = len;
 105         if (prev <= 1) break;  /* reached root */
 106         while (prev > 1 && !IS_SEPARATOR(path[prev - 1])) prev--;
 107         /* does removing it take us up a level? */
 108         if (len - prev != 1 || path[prev] != '.')  /* not '.' */
 109         {
 110             if (len - prev == 2 && path[prev] == '.' && path[prev+1] == '.')  /* is it '..'? */
 111                 level--;
 112             else
 113                 level++;
 114         }
 115         /* strip off trailing slashes */
 116         while (prev > 1 && IS_SEPARATOR(path[prev - 1])) prev--;
 117         len = prev;
 118     }
 119     return len;
 120 }
 121
 122
 123 /***********************************************************************
 124  *           find_drive_root
 125  *
 126  * Find a drive for which the root matches the beginning of the given path.
 127  * This can be used to translate a Unix path into a drive + DOS path.
 128  * Return value is the drive, or -1 on error. On success, ppath is modified
 129  * to point to the beginning of the DOS path.
 130  */
 131 static int find_drive_root( LPCWSTR *ppath )
 132 {
 133     /* Starting with the full path, check if the device and inode match any of
 134      * the wine 'drives'. If not then remove the last path component and try
 135      * again. If the last component was a '..' then skip a normal component
 136      * since it's a directory that's ascended back out of.
 137      */
 138     int drive, lenA, lenW;
 139     char *buffer, *p;
 140     const WCHAR *path = *ppath;
 141     struct stat st;
 142     struct drive_info info[MAX_DOS_DRIVES];
 143
 144     /* get device and inode of all drives */
 145     if (!get_drives_info( info )) return -1;
 146
 147     /* strip off trailing slashes */
 148     lenW = strlenW(path);
 149     while (lenW > 1 && IS_SEPARATOR(path[lenW - 1])) lenW--;
 150
 151     /* convert path to Unix encoding */
 152     lenA = ntdll_wcstoumbs( 0, path, lenW, NULL, 0, NULL, NULL );
 153     if (!(buffer = RtlAllocateHeap( GetProcessHeap(), 0, lenA + 1 ))) return -1;
 154     lenA = ntdll_wcstoumbs( 0, path, lenW, buffer, lenA, NULL, NULL );
 155     buffer[lenA] = 0;
 156     for (p = buffer; *p; p++) if (*p == '\\') *p = '/';
 157
 158     for (;;)
 159     {
 160         if (!stat( buffer, &st ) && S_ISDIR( st.st_mode ))
 161         {
 162             /* Find the drive */
 163             for (drive = 0; drive < MAX_DOS_DRIVES; drive++)
 164             {
 165                 if ((info[drive].dev == st.st_dev) && (info[drive].ino == st.st_ino))
 166                 {
 167                     if (lenW == 1) lenW = 0;  /* preserve root slash in returned path */
 168                     TRACE( "%s -> drive %c:, root=%s, name=%s\n",
 169                            debugstr_w(path), 'A' + drive, debugstr_a(buffer), debugstr_w(path + lenW));
 170                     *ppath += lenW;
 171                     RtlFreeHeap( GetProcessHeap(), 0, buffer );
 172                     return drive;
 173                 }
 174             }
 175         }
 176         if (lenW <= 1) break;  /* reached root */
 177         lenW = remove_last_component( path, lenW );
 178
 179         /* we only need the new length, buffer already contains the converted string */
 180         lenA = ntdll_wcstoumbs( 0, path, lenW, NULL, 0, NULL, NULL );
 181         buffer[lenA] = 0;
 182     }
 183     RtlFreeHeap( GetProcessHeap(), 0, buffer );
 184     return -1;
 185 }
 186
 187
 188 /***********************************************************************
 189  *             RtlDetermineDosPathNameType_U   (NTDLL.@)
 190  */
 191 DOS_PATHNAME_TYPE WINAPI RtlDetermineDosPathNameType_U( PCWSTR path )
 192 {
 193     if (IS_SEPARATOR(path[0]))
 194     {
 195         if (!IS_SEPARATOR(path[1])) return ABSOLUTE_PATH;       /* "/foo" */
 196         if (path[2] != '.') return UNC_PATH;                    /* "//foo" */
 197         if (IS_SEPARATOR(path[3])) return DEVICE_PATH;          /* "//./foo" */
 198         if (path[3]) return UNC_PATH;                           /* "//.foo" */
 199         return UNC_DOT_PATH;                                    /* "//." */
 200     }
 201     else
 202     {
 203         if (!path[0] || path[1] != ':') return RELATIVE_PATH;   /* "foo" */
 204         if (IS_SEPARATOR(path[2])) return ABSOLUTE_DRIVE_PATH;  /* "c:/foo" */
 205         return RELATIVE_DRIVE_PATH;                             /* "c:foo" */
 206     }
 207 }
 208
 209 /***********************************************************************
 210  *             RtlIsDosDeviceName_U   (NTDLL.@)
 211  *
 212  * Check if the given DOS path contains a DOS device name.
 213  *
 214  * Returns the length of the device name in the low word and its
 215  * position in the high word (both in bytes, not WCHARs), or 0 if no
 216  * device name is found.
 217  */
 218 ULONG WINAPI RtlIsDosDeviceName_U( PCWSTR dos_name )
 219 {
 220     static const WCHAR consoleW[] = {'\\','\\','.','\\','C','O','N',0};
 221     static const WCHAR auxW[3] = {'A','U','X'};
 222     static const WCHAR comW[3] = {'C','O','M'};
 223     static const WCHAR conW[3] = {'C','O','N'};
 224     static const WCHAR lptW[3] = {'L','P','T'};
 225     static const WCHAR nulW[3] = {'N','U','L'};
 226     static const WCHAR prnW[3] = {'P','R','N'};
 227
 228     const WCHAR *start, *end, *p;
 229
 230     switch(RtlDetermineDosPathNameType_U( dos_name ))
 231     {
 232     case INVALID_PATH:
 233     case UNC_PATH:
 234         return 0;
 235     case DEVICE_PATH:
 236         if (!strcmpiW( dos_name, consoleW ))
 237             return MAKELONG( sizeof(conW), 4 * sizeof(WCHAR) );  /* 4 is length of \\.\ prefix */
 238         return 0;
 239     default:
 240         break;
 241     }
 242
 243     end = dos_name + strlenW(dos_name) - 1;
 244     if (end >= dos_name && *end == ':') end--;  /* remove trailing ':' */
 245
 246     /* find start of file name */
 247     for (start = end; start >= dos_name; start--)
 248     {
 249         if (IS_SEPARATOR(start[0])) break;
 250         /* check for ':' but ignore if before extension (for things like NUL:.txt) */
 251         if (start[0] == ':' && start[1] != '.') break;
 252     }
 253     start++;
 254
 255     /* remove extension */
 256     if ((p = strchrW( start, '.' )))
 257     {
 258         end = p - 1;
 259         if (end >= dos_name && *end == ':') end--;  /* remove trailing ':' before extension */
 260     }
 261     else
 262     {
 263         /* no extension, remove trailing spaces */
 264         while (end >= dos_name && *end == ' ') end--;
 265     }
 266
 267     /* now we have a potential device name between start and end, check it */
 268     switch(end - start + 1)
 269     {
 270     case 3:
 271         if (strncmpiW( start, auxW, 3 ) &&
 272             strncmpiW( start, conW, 3 ) &&
 273             strncmpiW( start, nulW, 3 ) &&
 274             strncmpiW( start, prnW, 3 )) break;
 275         return MAKELONG( 3 * sizeof(WCHAR), (start - dos_name) * sizeof(WCHAR) );
 276     case 4:
 277         if (strncmpiW( start, comW, 3 ) && strncmpiW( start, lptW, 3 )) break;
 278         if (*end <= '0' || *end > '9') break;
 279         return MAKELONG( 4 * sizeof(WCHAR), (start - dos_name) * sizeof(WCHAR) );
 280     default:  /* can't match anything */
 281         break;
 282     }
 283     return 0;
 284 }
 285
 286
 287 /**************************************************************************
 288  *                 RtlDosPathNameToNtPathName_U         [NTDLL.@]
 289  *
 290  * dos_path: a DOS path name (fully qualified or not)
 291  * ntpath:   pointer to a UNICODE_STRING to hold the converted
 292  *           path name
 293  * file_part:will point (in ntpath) to the file part in the path
 294  * cd:       directory reference (optional)
 295  *
 296  * FIXME:
 297  *      + fill the cd structure
 298  */
 299 BOOLEAN  WINAPI RtlDosPathNameToNtPathName_U(PCWSTR dos_path,
 300                                              PUNICODE_STRING ntpath,
 301                                              PWSTR* file_part,
 302                                              CURDIR* cd)
 303 {
 304     static const WCHAR LongFileNamePfxW[4] = {'\\','\\','?','\\'};
 305     ULONG sz, offset;
 306     WCHAR local[MAX_PATH];
 307     LPWSTR ptr;
 308
 309     TRACE("(%s,%p,%p,%p)\n",
 310           debugstr_w(dos_path), ntpath, file_part, cd);
 311
 312     if (cd)
 313     {
 314         FIXME("Unsupported parameter\n");
 315         memset(cd, 0, sizeof(*cd));
 316     }
 317
 318     if (!dos_path || !*dos_path) return FALSE;
 319
 320     if (!strncmpW(dos_path, LongFileNamePfxW, 4))
 321     {
 322         ntpath->Length = strlenW(dos_path) * sizeof(WCHAR);
 323         ntpath->MaximumLength = ntpath->Length + sizeof(WCHAR);
 324         ntpath->Buffer = RtlAllocateHeap(GetProcessHeap(), 0, ntpath->MaximumLength);
 325         if (!ntpath->Buffer) return FALSE;
 326         memcpy( ntpath->Buffer, dos_path, ntpath->MaximumLength );
 327         ntpath->Buffer[1] = '?';  /* change \\?\ to \??\ */
 328         return TRUE;
 329     }
 330
 331     ptr = local;
 332     sz = RtlGetFullPathName_U(dos_path, sizeof(local), ptr, file_part);
 333     if (sz == 0) return FALSE;
 334     if (sz > sizeof(local))
 335     {
 336         ptr = RtlAllocateHeap(GetProcessHeap(), 0, sz);
 337         sz = RtlGetFullPathName_U(dos_path, sz, ptr, file_part);
 338     }
 339
 340     ntpath->MaximumLength = sz + (4 /* unc\ */ + 4 /* \??\ */) * sizeof(WCHAR);
 341     ntpath->Buffer = RtlAllocateHeap(GetProcessHeap(), 0, ntpath->MaximumLength);
 342     if (!ntpath->Buffer)
 343     {
 344         if (ptr != local) RtlFreeHeap(GetProcessHeap(), 0, ptr);
 345         return FALSE;
 346     }
 347
 348     strcpyW(ntpath->Buffer, NTDosPrefixW);
 349     offset = 0;
 350     switch (RtlDetermineDosPathNameType_U(ptr))
 351     {
 352     case UNC_PATH: /* \\foo */
 353         offset = 2;
 354         strcatW(ntpath->Buffer, UncPfxW);
 355         break;
 356     case DEVICE_PATH: /* \\.\foo */
 357         offset = 4;
 358         break;
 359     default:
 360         break; /* needed to keep gcc quiet */
 361     }
 362
 363     strcatW(ntpath->Buffer, ptr + offset);
 364     ntpath->Length = strlenW(ntpath->Buffer) * sizeof(WCHAR);
 365
 366     if (file_part && *file_part)
 367         *file_part = ntpath->Buffer + ntpath->Length / sizeof(WCHAR) - strlenW(*file_part);
 368
 369     /* FIXME: cd filling */
 370
 371     if (ptr != local) RtlFreeHeap(GetProcessHeap(), 0, ptr);
 372     return TRUE;
 373 }
 374
 375 /******************************************************************
 376  *              RtlDosSearchPath_U
 377  *
 378  * Searchs a file of name 'name' into a ';' separated list of paths
 379  * (stored in paths)
 380  * Doesn't seem to search elsewhere than the paths list
 381  * Stores the result in buffer (file_part will point to the position
 382  * of the file name in the buffer)
 383  * FIXME:
 384  * - how long shall the paths be ??? (MAX_PATH or larger with \\?\ constructs ???)
 385  */
 386 ULONG WINAPI RtlDosSearchPath_U(LPCWSTR paths, LPCWSTR search, LPCWSTR ext,
 387                                 ULONG buffer_size, LPWSTR buffer,
 388                                 LPWSTR* file_part)
 389 {
 390     DOS_PATHNAME_TYPE type = RtlDetermineDosPathNameType_U(search);
 391     ULONG len = 0;
 392
 393     if (type == RELATIVE_PATH)
 394     {
 395         ULONG allocated = 0, needed, filelen;
 396         WCHAR *name = NULL;
 397
 398         filelen = 1 /* for \ */ + strlenW(search) + 1 /* \0 */;
 399
 400         /* Windows only checks for '.' without worrying about path components */
 401         if (strchrW( search, '.' )) ext = NULL;
 402         if (ext != NULL) filelen += strlenW(ext);
 403
 404         while (*paths)
 405         {
 406             LPCWSTR ptr;
 407
 408             for (needed = 0, ptr = paths; *ptr != 0 && *ptr++ != ';'; needed++);
 409             if (needed + filelen > allocated)
 410             {
 411                 if (!name) name = RtlAllocateHeap(GetProcessHeap(), 0,
 412                                                   (needed + filelen) * sizeof(WCHAR));
 413                 else
 414                 {
 415                     WCHAR *newname = RtlReAllocateHeap(GetProcessHeap(), 0, name,
 416                                                        (needed + filelen) * sizeof(WCHAR));
 417                     if (!newname) RtlFreeHeap(GetProcessHeap(), 0, name);
 418                     name = newname;
 419                 }
 420                 if (!name) return 0;
 421                 allocated = needed + filelen;
 422             }
 423             memmove(name, paths, needed * sizeof(WCHAR));
 424             /* append '\\' if none is present */
 425             if (needed > 0 && name[needed - 1] != '\\') name[needed++] = '\\';
 426             strcpyW(&name[needed], search);
 427             if (ext) strcatW(&name[needed], ext);
 428             if (RtlDoesFileExists_U(name))
 429             {
 430                 len = RtlGetFullPathName_U(name, buffer_size, buffer, file_part);
 431                 break;
 432             }
 433             paths = ptr;
 434         }
 435         RtlFreeHeap(GetProcessHeap(), 0, name);
 436     }
 437     else if (RtlDoesFileExists_U(search))
 438     {
 439         len = RtlGetFullPathName_U(search, buffer_size, buffer, file_part);
 440     }
 441
 442     return len;
 443 }
 444
 445
 446 /******************************************************************
 447  *              collapse_path
 448  *
 449  * Helper for RtlGetFullPathName_U.
 450  * Get rid of . and .. components in the path.
 451  */
 452 static inline void collapse_path( WCHAR *path, UINT mark )
 453 {
 454     WCHAR *p, *next;
 455
 456     /* convert every / into a \ */
 457     for (p = path; *p; p++) if (*p == '/') *p = '\\';
 458
 459     /* collapse duplicate backslashes */
 460     next = path + max( 1, mark );
 461     for (p = next; *p; p++) if (*p != '\\' || next[-1] != '\\') *next++ = *p;
 462     *next = 0;
 463
 464     p = path + mark;
 465     while (*p)
 466     {
 467         if (*p == '.')
 468         {
 469             switch(p[1])
 470             {
 471             case '\\': /* .\ component */
 472                 next = p + 2;
 473                 memmove( p, next, (strlenW(next) + 1) * sizeof(WCHAR) );
 474                 continue;
 475             case 0:  /* final . */
 476                 if (p > path + mark) p--;
 477                 *p = 0;
 478                 continue;
 479             case '.':
 480                 if (p[2] == '\\')  /* ..\ component */
 481                 {
 482                     next = p + 3;
 483                     if (p > path + mark)
 484                     {
 485                         p--;
 486                         while (p > path + mark && p[-1] != '\\') p--;
 487                     }
 488                     memmove( p, next, (strlenW(next) + 1) * sizeof(WCHAR) );
 489                     continue;
 490                 }
 491                 else if (!p[2])  /* final .. */
 492                 {
 493                     if (p > path + mark)
 494                     {
 495                         p--;
 496                         while (p > path + mark && p[-1] != '\\') p--;
 497                         if (p > path + mark) p--;
 498                     }
 499                     *p = 0;
 500                     continue;
 501                 }
 502                 break;
 503             }
 504         }
 505         /* skip to the next component */
 506         while (*p && *p != '\\') p++;
 507         if (*p == '\\') p++;
 508     }
 509 }
 510
 511
 512 /******************************************************************
 513  *              skip_unc_prefix
 514  *
 515  * Skip the \\share\dir\ part of a file name. Helper for RtlGetFullPathName_U.
 516  */
 517 static const WCHAR *skip_unc_prefix( const WCHAR *ptr )
 518 {
 519     ptr += 2;
 520     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* share name */
 521     while (IS_SEPARATOR(*ptr)) ptr++;
 522     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* dir name */
 523     while (IS_SEPARATOR(*ptr)) ptr++;
 524     return ptr;
 525 }
 526
 527
 528 /******************************************************************
 529  *              get_full_path_helper
 530  *
 531  * Helper for RtlGetFullPathName_U
 532  * Note: name and buffer are allowed to point to the same memory spot
 533  */
 534 static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
 535 {
 536     ULONG                       reqsize = 0, mark = 0, dep = 0, deplen;
 537     DOS_PATHNAME_TYPE           type;
 538     LPWSTR                      ins_str = NULL;
 539     LPCWSTR                     ptr;
 540     const UNICODE_STRING*       cd;
 541     WCHAR                       tmp[4];
 542
 543     RtlAcquirePebLock();
 544
 545     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 546         cd = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 547     else
 548         cd = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 549
 550     switch (type = RtlDetermineDosPathNameType_U(name))
 551     {
 552     case UNC_PATH:              /* \\foo   */
 553         ptr = skip_unc_prefix( name );
 554         mark = (ptr - name);
 555         break;
 556
 557     case DEVICE_PATH:           /* \\.\foo */
 558         mark = 4;
 559         break;
 560
 561     case ABSOLUTE_DRIVE_PATH:   /* c:\foo  */
 562         reqsize = sizeof(WCHAR);
 563         tmp[0] = toupperW(name[0]);
 564         ins_str = tmp;
 565         dep = 1;
 566         mark = 3;
 567         break;
 568
 569     case RELATIVE_DRIVE_PATH:   /* c:foo   */
 570         dep = 2;
 571         if (toupperW(name[0]) != toupperW(cd->Buffer[0]) || cd->Buffer[1] != ':')
 572         {
 573             UNICODE_STRING      var, val;
 574
 575             tmp[0] = '=';
 576             tmp[1] = name[0];
 577             tmp[2] = ':';
 578             tmp[3] = '\0';
 579             var.Length = 3 * sizeof(WCHAR);
 580             var.MaximumLength = 4 * sizeof(WCHAR);
 581             var.Buffer = tmp;
 582             val.Length = 0;
 583             val.MaximumLength = size;
 584             val.Buffer = RtlAllocateHeap(GetProcessHeap(), 0, size);
 585
 586             switch (RtlQueryEnvironmentVariable_U(NULL, &var, &val))
 587             {
 588             case STATUS_SUCCESS:
 589                 /* FIXME: Win2k seems to check that the environment variable actually points
 590                  * to an existing directory. If not, root of the drive is used
 591                  * (this seems also to be the only spot in RtlGetFullPathName that the
 592                  * existence of a part of a path is checked)
 593                  */
 594                 /* fall thru */
 595             case STATUS_BUFFER_TOO_SMALL:
 596                 reqsize = val.Length + sizeof(WCHAR); /* append trailing '\\' */
 597                 val.Buffer[val.Length / sizeof(WCHAR)] = '\\';
 598                 ins_str = val.Buffer;
 599                 break;
 600             case STATUS_VARIABLE_NOT_FOUND:
 601                 reqsize = 3 * sizeof(WCHAR);
 602                 tmp[0] = name[0];
 603                 tmp[1] = ':';
 604                 tmp[2] = '\\';
 605                 ins_str = tmp;
 606                 break;
 607             default:
 608                 ERR("Unsupported status code\n");
 609                 break;
 610             }
 611             mark = 3;
 612             break;
 613         }
 614         /* fall through */
 615
 616     case RELATIVE_PATH:         /* foo     */
 617         reqsize = cd->Length;
 618         ins_str = cd->Buffer;
 619         if (cd->Buffer[1] != ':')
 620         {
 621             ptr = skip_unc_prefix( cd->Buffer );
 622             mark = ptr - cd->Buffer;
 623         }
 624         else mark = 3;
 625         break;
 626
 627     case ABSOLUTE_PATH:         /* \xxx    */
 628         if (name[0] == '/')  /* may be a Unix path */
 629         {
 630             const WCHAR *ptr = name;
 631             int drive = find_drive_root( &ptr );
 632             if (drive != -1)
 633             {
 634                 reqsize = 3 * sizeof(WCHAR);
 635                 tmp[0] = 'A' + drive;
 636                 tmp[1] = ':';
 637                 tmp[2] = '\\';
 638                 ins_str = tmp;
 639                 mark = 3;
 640                 dep = ptr - name;
 641                 break;
 642             }
 643         }
 644         if (cd->Buffer[1] == ':')
 645         {
 646             reqsize = 2 * sizeof(WCHAR);
 647             tmp[0] = cd->Buffer[0];
 648             tmp[1] = ':';
 649             ins_str = tmp;
 650             mark = 3;
 651         }
 652         else
 653         {
 654             ptr = skip_unc_prefix( cd->Buffer );
 655             reqsize = (ptr - cd->Buffer) * sizeof(WCHAR);
 656             mark = reqsize / sizeof(WCHAR);
 657             ins_str = cd->Buffer;
 658         }
 659         break;
 660
 661     case UNC_DOT_PATH:         /* \\.     */
 662         reqsize = 4 * sizeof(WCHAR);
 663         dep = 3;
 664         tmp[0] = '\\';
 665         tmp[1] = '\\';
 666         tmp[2] = '.';
 667         tmp[3] = '\\';
 668         ins_str = tmp;
 669         mark = 4;
 670         break;
 671
 672     case INVALID_PATH:
 673         goto done;
 674     }
 675
 676     /* enough space ? */
 677     deplen = strlenW(name + dep) * sizeof(WCHAR);
 678     if (reqsize + deplen + sizeof(WCHAR) > size)
 679     {
 680         /* not enough space, return need size (including terminating '\0') */
 681         reqsize += deplen + sizeof(WCHAR);
 682         goto done;
 683     }
 684
 685     memmove(buffer + reqsize / sizeof(WCHAR), name + dep, deplen + sizeof(WCHAR));
 686     if (reqsize) memcpy(buffer, ins_str, reqsize);
 687     reqsize += deplen;
 688
 689     if (ins_str && ins_str != tmp && ins_str != cd->Buffer)
 690         RtlFreeHeap(GetProcessHeap(), 0, ins_str);
 691
 692     collapse_path( buffer, mark );
 693     reqsize = strlenW(buffer) * sizeof(WCHAR);
 694
 695 done:
 696     RtlReleasePebLock();
 697     return reqsize;
 698 }
 699
 700 /******************************************************************
 701  *              RtlGetFullPathName_U  (NTDLL.@)
 702  *
 703  * Returns the number of bytes written to buffer (not including the
 704  * terminating NULL) if the function succeeds, or the required number of bytes
 705  * (including the terminating NULL) if the buffer is too small.
 706  *
 707  * file_part will point to the filename part inside buffer (except if we use
 708  * DOS device name, in which case file_in_buf is NULL)
 709  *
 710  */
 711 DWORD WINAPI RtlGetFullPathName_U(const WCHAR* name, ULONG size, WCHAR* buffer,
 712                                   WCHAR** file_part)
 713 {
 714     WCHAR*      ptr;
 715     DWORD       dosdev;
 716     DWORD       reqsize;
 717
 718     TRACE("(%s %lu %p %p)\n", debugstr_w(name), size, buffer, file_part);
 719
 720     if (!name || !*name) return 0;
 721
 722     if (file_part) *file_part = NULL;
 723
 724     /* check for DOS device name */
 725     dosdev = RtlIsDosDeviceName_U(name);
 726     if (dosdev)
 727     {
 728         DWORD   offset = HIWORD(dosdev) / sizeof(WCHAR); /* get it in WCHARs, not bytes */
 729         DWORD   sz = LOWORD(dosdev); /* in bytes */
 730
 731         if (8 + sz + 2 > size) return sz + 10;
 732         strcpyW(buffer, DeviceRootW);
 733         memmove(buffer + 4, name + offset, sz);
 734         buffer[4 + sz / sizeof(WCHAR)] = '\0';
 735         /* file_part isn't set in this case */
 736         return sz + 8;
 737     }
 738
 739     reqsize = get_full_path_helper(name, buffer, size);
 740     if (reqsize > size)
 741     {
 742         LPWSTR tmp = RtlAllocateHeap(GetProcessHeap(), 0, reqsize);
 743         reqsize = get_full_path_helper(name, tmp, reqsize);
 744         if (reqsize > size)  /* it may have worked the second time */
 745         {
 746             RtlFreeHeap(GetProcessHeap(), 0, tmp);
 747             return reqsize + sizeof(WCHAR);
 748         }
 749         memcpy( buffer, tmp, reqsize + sizeof(WCHAR) );
 750         RtlFreeHeap(GetProcessHeap(), 0, tmp);
 751     }
 752
 753     /* find file part */
 754     if (file_part && (ptr = strrchrW(buffer, '\\')) != NULL && ptr >= buffer + 2 && *++ptr)
 755         *file_part = ptr;
 756     return reqsize;
 757 }
 758
 759 /*************************************************************************
 760  * RtlGetLongestNtPathLength    [NTDLL.@]
 761  *
 762  * Get the longest allowed path length
 763  *
 764  * PARAMS
 765  *  None.
 766  *
 767  * RETURNS
 768  *  The longest allowed path length (277 characters under Win2k).
 769  */
 770 DWORD WINAPI RtlGetLongestNtPathLength(void)
 771 {
 772     return 277;
 773 }
 774
 775 /******************************************************************
 776  *             RtlIsNameLegalDOS8Dot3   (NTDLL.@)
 777  *
 778  * Returns TRUE iff unicode is a valid DOS (8+3) name.
 779  * If the name is valid, oem gets filled with the corresponding OEM string
 780  * spaces is set to TRUE if unicode contains spaces
 781  */
 782 BOOLEAN WINAPI RtlIsNameLegalDOS8Dot3( const UNICODE_STRING *unicode,
 783                                        OEM_STRING *oem, BOOLEAN *spaces )
 784 {
 785     static const char* illegal = "*?<>|\"+=,;[]:/\\\345";
 786     int dot = -1;
 787     unsigned int i;
 788     char buffer[12];
 789     OEM_STRING oem_str;
 790     BOOLEAN got_space = FALSE;
 791
 792     if (!oem)
 793     {
 794         oem_str.Length = sizeof(buffer);
 795         oem_str.MaximumLength = sizeof(buffer);
 796         oem_str.Buffer = buffer;
 797         oem = &oem_str;
 798     }
 799     if (RtlUpcaseUnicodeStringToCountedOemString( oem, unicode, FALSE ) != STATUS_SUCCESS)
 800         return FALSE;
 801
 802     if (oem->Length > 12) return FALSE;
 803
 804     /* a starting . is invalid, except for . and .. */
 805     if (oem->Buffer[0] == '.')
 806     {
 807         if (oem->Length != 1 && (oem->Length != 2 || oem->Buffer[1] != '.')) return FALSE;
 808         if (spaces) *spaces = FALSE;
 809         return TRUE;
 810     }
 811
 812     for (i = 0; i < oem->Length; i++)
 813     {
 814         switch (oem->Buffer[i])
 815         {
 816         case ' ':
 817             /* leading/trailing spaces not allowed */
 818             if (!i || i == oem->Length-1 || oem->Buffer[i+1] == '.') return FALSE;
 819             got_space = TRUE;
 820             break;
 821         case '.':
 822             if (dot != -1) return FALSE;
 823             dot = i;
 824             break;
 825         default:
 826             if (strchr(illegal, oem->Buffer[i])) return FALSE;
 827             break;
 828         }
 829     }
 830     /* check file part is shorter than 8, extension shorter than 3
 831      * dot cannot be last in string
 832      */
 833     if (dot == -1)
 834     {
 835         if (oem->Length > 8) return FALSE;
 836     }
 837     else
 838     {
 839         if (dot > 8 || (oem->Length - dot > 4) || dot == oem->Length - 1) return FALSE;
 840     }
 841     if (spaces) *spaces = got_space;
 842     return TRUE;
 843 }
 844
 845 /******************************************************************
 846  *              RtlGetCurrentDirectory_U (NTDLL.@)
 847  *
 848  */
 849 NTSTATUS WINAPI RtlGetCurrentDirectory_U(ULONG buflen, LPWSTR buf)
 850 {
 851     UNICODE_STRING*     us;
 852     ULONG               len;
 853
 854     TRACE("(%lu %p)\n", buflen, buf);
 855
 856     RtlAcquirePebLock();
 857
 858     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 859         us = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 860     else
 861         us = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 862
 863     len = us->Length / sizeof(WCHAR);
 864     if (us->Buffer[len - 1] == '\\' && us->Buffer[len - 2] != ':')
 865         len--;
 866
 867     if (buflen / sizeof(WCHAR) > len)
 868     {
 869         memcpy(buf, us->Buffer, len * sizeof(WCHAR));
 870         buf[len] = '\0';
 871     }
 872     else
 873     {
 874         len++;
 875     }
 876
 877     RtlReleasePebLock();
 878
 879     return len * sizeof(WCHAR);
 880 }
 881
 882 /******************************************************************
 883  *              RtlSetCurrentDirectory_U (NTDLL.@)
 884  *
 885  */
 886 NTSTATUS WINAPI RtlSetCurrentDirectory_U(const UNICODE_STRING* dir)
 887 {
 888     FILE_FS_DEVICE_INFORMATION device_info;
 889     OBJECT_ATTRIBUTES attr;
 890     UNICODE_STRING newdir;
 891     IO_STATUS_BLOCK io;
 892     CURDIR *curdir;
 893     HANDLE handle;
 894     NTSTATUS nts;
 895     ULONG size;
 896     PWSTR ptr;
 897
 898     newdir.Buffer = NULL;
 899
 900     RtlAcquirePebLock();
 901
 902     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 903         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir;
 904     else
 905         curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory;
 906
 907     if (!RtlDosPathNameToNtPathName_U( dir->Buffer, &newdir, NULL, NULL ))
 908     {
 909         nts = STATUS_OBJECT_NAME_INVALID;
 910         goto out;
 911     }
 912
 913     attr.Length = sizeof(attr);
 914     attr.RootDirectory = 0;
 915     attr.Attributes = OBJ_CASE_INSENSITIVE;
 916     attr.ObjectName = &newdir;
 917     attr.SecurityDescriptor = NULL;
 918     attr.SecurityQualityOfService = NULL;
 919
 920     nts = NtOpenFile( &handle, 0, &attr, &io, 0, FILE_DIRECTORY_FILE );
 921     if (nts != STATUS_SUCCESS) goto out;
 922
 923     /* don't keep the directory handle open on removable media */
 924     if (!NtQueryVolumeInformationFile( handle, &io, &device_info,
 925                                        sizeof(device_info), FileFsDeviceInformation ) &&
 926         (device_info.Characteristics & FILE_REMOVABLE_MEDIA))
 927     {
 928         NtClose( handle );
 929         handle = 0;
 930     }
 931
 932     if (curdir->Handle) NtClose( curdir->Handle );
 933     curdir->Handle = handle;
 934
 935     /* append trailing \ if missing */
 936     size = newdir.Length / sizeof(WCHAR);
 937     ptr = newdir.Buffer;
 938     ptr += 4;  /* skip \??\ prefix */
 939     size -= 4;
 940     if (size && ptr[size - 1] != '\\') ptr[size++] = '\\';
 941
 942     memcpy( curdir->DosPath.Buffer, ptr, size * sizeof(WCHAR));
 943     curdir->DosPath.Buffer[size] = 0;
 944     curdir->DosPath.Length = size * sizeof(WCHAR);
 945
 946     TRACE( "curdir now %s %p\n", debugstr_w(curdir->DosPath.Buffer), curdir->Handle );
 947
 948  out:
 949     RtlFreeUnicodeString( &newdir );
 950     RtlReleasePebLock();
 951     return nts;
 952 }