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 #ifdef HAVE_SYS_STAT_H
  27 # include <sys/stat.h>
  28 #endif
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "winreg.h"
  33 #include "winternl.h"
  34 #include "winioctl.h"
  35 #include "wine/unicode.h"
  36 #include "wine/debug.h"
  37 #include "wine/library.h"
  38 #include "ntdll_misc.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(file);
  41
  42 static const WCHAR DeviceRootW[] = {'\\','\\','.','\\',0};
  43 static const WCHAR NTDosPrefixW[] = {'\\','?','?','\\',0};
  44 static const WCHAR UncPfxW[] = {'U','N','C','\\',0};
  45
  46 #define IS_SEPARATOR(ch)  ((ch) == '\\' || (ch) == '/')
  47
  48 #define MAX_DOS_DRIVES 26
  49
  50 struct drive_info
  51 {
  52     dev_t dev;
  53     ino_t ino;
  54 };
  55
  56 /***********************************************************************
  57  *           get_drives_info
  58  *
  59  * Retrieve device/inode number for all the drives. Helper for find_drive_root.
  60  */
  61 static inline int get_drives_info( struct drive_info info[MAX_DOS_DRIVES] )
  62 {
  63     const char *config_dir = wine_get_config_dir();
  64     char *buffer, *p;
  65     struct stat st;
  66     int i, ret;
  67
  68     buffer = RtlAllocateHeap( GetProcessHeap(), 0, strlen(config_dir) + sizeof("/dosdevices/a:") );
  69     if (!buffer) return 0;
  70     strcpy( buffer, config_dir );
  71     strcat( buffer, "/dosdevices/a:" );
  72     p = buffer + strlen(buffer) - 2;
  73
  74     for (i = ret = 0; i < MAX_DOS_DRIVES; i++)
  75     {
  76         *p = 'a' + i;
  77         if (!stat( buffer, &st ))
  78         {
  79             info[i].dev = st.st_dev;
  80             info[i].ino = st.st_ino;
  81             ret++;
  82         }
  83         else
  84         {
  85             info[i].dev = 0;
  86             info[i].ino = 0;
  87         }
  88     }
  89     RtlFreeHeap( GetProcessHeap(), 0, buffer );
  90     return ret;
  91 }
  92
  93
  94 /***********************************************************************
  95  *           remove_last_component
  96  *
  97  * Remove the last component of the path. Helper for find_drive_root.
  98  */
  99 static inline int remove_last_component( const WCHAR *path, int len )
 100 {
 101     int level = 0;
 102
 103     while (level < 1)
 104     {
 105         /* find start of the last path component */
 106         int prev = len;
 107         if (prev <= 1) break;  /* reached root */
 108         while (prev > 1 && !IS_SEPARATOR(path[prev - 1])) prev--;
 109         /* does removing it take us up a level? */
 110         if (len - prev != 1 || path[prev] != '.')  /* not '.' */
 111         {
 112             if (len - prev == 2 && path[prev] == '.' && path[prev+1] == '.')  /* is it '..'? */
 113                 level--;
 114             else
 115                 level++;
 116         }
 117         /* strip off trailing slashes */
 118         while (prev > 1 && IS_SEPARATOR(path[prev - 1])) prev--;
 119         len = prev;
 120     }
 121     return len;
 122 }
 123
 124
 125 /***********************************************************************
 126  *           find_drive_root
 127  *
 128  * Find a drive for which the root matches the beginning of the given path.
 129  * This can be used to translate a Unix path into a drive + DOS path.
 130  * Return value is the drive, or -1 on error. On success, ppath is modified
 131  * to point to the beginning of the DOS path.
 132  */
 133 static int find_drive_root( LPCWSTR *ppath )
 134 {
 135     /* Starting with the full path, check if the device and inode match any of
 136      * the wine 'drives'. If not then remove the last path component and try
 137      * again. If the last component was a '..' then skip a normal component
 138      * since it's a directory that's ascended back out of.
 139      */
 140     int drive, lenA, lenW;
 141     char *buffer, *p;
 142     const WCHAR *path = *ppath;
 143     struct stat st;
 144     struct drive_info info[MAX_DOS_DRIVES];
 145
 146     /* get device and inode of all drives */
 147     if (!get_drives_info( info )) return -1;
 148
 149     /* strip off trailing slashes */
 150     lenW = strlenW(path);
 151     while (lenW > 1 && IS_SEPARATOR(path[lenW - 1])) lenW--;
 152
 153     /* convert path to Unix encoding */
 154     lenA = ntdll_wcstoumbs( 0, path, lenW, NULL, 0, NULL, NULL );
 155     if (!(buffer = RtlAllocateHeap( GetProcessHeap(), 0, lenA + 1 ))) return -1;
 156     lenA = ntdll_wcstoumbs( 0, path, lenW, buffer, lenA, NULL, NULL );
 157     buffer[lenA] = 0;
 158     for (p = buffer; *p; p++) if (*p == '\\') *p = '/';
 159
 160     for (;;)
 161     {
 162         if (!stat( buffer, &st ) && S_ISDIR( st.st_mode ))
 163         {
 164             /* Find the drive */
 165             for (drive = 0; drive < MAX_DOS_DRIVES; drive++)
 166             {
 167                 if ((info[drive].dev == st.st_dev) && (info[drive].ino == st.st_ino))
 168                 {
 169                     if (lenW == 1) lenW = 0;  /* preserve root slash in returned path */
 170                     TRACE( "%s -> drive %c:, root=%s, name=%s\n",
 171                            debugstr_w(path), 'A' + drive, debugstr_a(buffer), debugstr_w(path + lenW));
 172                     *ppath += lenW;
 173                     RtlFreeHeap( GetProcessHeap(), 0, buffer );
 174                     return drive;
 175                 }
 176             }
 177         }
 178         if (lenW <= 1) break;  /* reached root */
 179         lenW = remove_last_component( path, lenW );
 180
 181         /* we only need the new length, buffer already contains the converted string */
 182         lenA = ntdll_wcstoumbs( 0, path, lenW, NULL, 0, NULL, NULL );
 183         buffer[lenA] = 0;
 184     }
 185     RtlFreeHeap( GetProcessHeap(), 0, buffer );
 186     return -1;
 187 }
 188
 189
 190 /***********************************************************************
 191  *             RtlDetermineDosPathNameType_U   (NTDLL.@)
 192  */
 193 DOS_PATHNAME_TYPE WINAPI RtlDetermineDosPathNameType_U( PCWSTR path )
 194 {
 195     if (IS_SEPARATOR(path[0]))
 196     {
 197         if (!IS_SEPARATOR(path[1])) return ABSOLUTE_PATH;       /* "/foo" */
 198         if (path[2] != '.') return UNC_PATH;                    /* "//foo" */
 199         if (IS_SEPARATOR(path[3])) return DEVICE_PATH;          /* "//./foo" */
 200         if (path[3]) return UNC_PATH;                           /* "//.foo" */
 201         return UNC_DOT_PATH;                                    /* "//." */
 202     }
 203     else
 204     {
 205         if (!path[0] || path[1] != ':') return RELATIVE_PATH;   /* "foo" */
 206         if (IS_SEPARATOR(path[2])) return ABSOLUTE_DRIVE_PATH;  /* "c:/foo" */
 207         return RELATIVE_DRIVE_PATH;                             /* "c:foo" */
 208     }
 209 }
 210
 211 /***********************************************************************
 212  *             RtlIsDosDeviceName_U   (NTDLL.@)
 213  *
 214  * Check if the given DOS path contains a DOS device name.
 215  *
 216  * Returns the length of the device name in the low word and its
 217  * position in the high word (both in bytes, not WCHARs), or 0 if no
 218  * device name is found.
 219  */
 220 ULONG WINAPI RtlIsDosDeviceName_U( PCWSTR dos_name )
 221 {
 222     static const WCHAR consoleW[] = {'\\','\\','.','\\','C','O','N',0};
 223     static const WCHAR auxW[3] = {'A','U','X'};
 224     static const WCHAR comW[3] = {'C','O','M'};
 225     static const WCHAR conW[3] = {'C','O','N'};
 226     static const WCHAR lptW[3] = {'L','P','T'};
 227     static const WCHAR nulW[3] = {'N','U','L'};
 228     static const WCHAR prnW[3] = {'P','R','N'};
 229
 230     const WCHAR *start, *end, *p;
 231
 232     switch(RtlDetermineDosPathNameType_U( dos_name ))
 233     {
 234     case INVALID_PATH:
 235     case UNC_PATH:
 236         return 0;
 237     case DEVICE_PATH:
 238         if (!strcmpiW( dos_name, consoleW ))
 239             return MAKELONG( sizeof(conW), 4 * sizeof(WCHAR) );  /* 4 is length of \\.\ prefix */
 240         return 0;
 241     default:
 242         break;
 243     }
 244
 245     end = dos_name + strlenW(dos_name) - 1;
 246     if (end >= dos_name && *end == ':') end--;  /* remove trailing ':' */
 247
 248     /* find start of file name */
 249     for (start = end; start >= dos_name; start--)
 250     {
 251         if (IS_SEPARATOR(start[0])) break;
 252         /* check for ':' but ignore if before extension (for things like NUL:.txt) */
 253         if (start[0] == ':' && start[1] != '.') break;
 254     }
 255     start++;
 256
 257     /* remove extension */
 258     if ((p = strchrW( start, '.' )))
 259     {
 260         end = p - 1;
 261         if (end >= dos_name && *end == ':') end--;  /* remove trailing ':' before extension */
 262     }
 263     else
 264     {
 265         /* no extension, remove trailing spaces */
 266         while (end >= dos_name && *end == ' ') end--;
 267     }
 268
 269     /* now we have a potential device name between start and end, check it */
 270     switch(end - start + 1)
 271     {
 272     case 3:
 273         if (strncmpiW( start, auxW, 3 ) &&
 274             strncmpiW( start, conW, 3 ) &&
 275             strncmpiW( start, nulW, 3 ) &&
 276             strncmpiW( start, prnW, 3 )) break;
 277         return MAKELONG( 3 * sizeof(WCHAR), (start - dos_name) * sizeof(WCHAR) );
 278     case 4:
 279         if (strncmpiW( start, comW, 3 ) && strncmpiW( start, lptW, 3 )) break;
 280         if (*end <= '0' || *end > '9') break;
 281         return MAKELONG( 4 * sizeof(WCHAR), (start - dos_name) * sizeof(WCHAR) );
 282     default:  /* can't match anything */
 283         break;
 284     }
 285     return 0;
 286 }
 287
 288
 289 /**************************************************************************
 290  *                 RtlDosPathNameToNtPathName_U         [NTDLL.@]
 291  *
 292  * dos_path: a DOS path name (fully qualified or not)
 293  * ntpath:   pointer to a UNICODE_STRING to hold the converted
 294  *           path name
 295  * file_part:will point (in ntpath) to the file part in the path
 296  * cd:       directory reference (optional)
 297  *
 298  * FIXME:
 299  *      + fill the cd structure
 300  */
 301 BOOLEAN  WINAPI RtlDosPathNameToNtPathName_U(PCWSTR dos_path,
 302                                              PUNICODE_STRING ntpath,
 303                                              PWSTR* file_part,
 304                                              CURDIR* cd)
 305 {
 306     static const WCHAR LongFileNamePfxW[4] = {'\\','\\','?','\\'};
 307     ULONG sz, offset;
 308     WCHAR local[MAX_PATH];
 309     LPWSTR ptr;
 310
 311     TRACE("(%s,%p,%p,%p)\n",
 312           debugstr_w(dos_path), ntpath, file_part, cd);
 313
 314     if (cd)
 315     {
 316         FIXME("Unsupported parameter\n");
 317         memset(cd, 0, sizeof(*cd));
 318     }
 319
 320     if (!dos_path || !*dos_path) return FALSE;
 321
 322     if (!strncmpW(dos_path, LongFileNamePfxW, 4))
 323     {
 324         ntpath->Length = strlenW(dos_path) * sizeof(WCHAR);
 325         ntpath->MaximumLength = ntpath->Length + sizeof(WCHAR);
 326         ntpath->Buffer = RtlAllocateHeap(GetProcessHeap(), 0, ntpath->MaximumLength);
 327         if (!ntpath->Buffer) return FALSE;
 328         memcpy( ntpath->Buffer, dos_path, ntpath->MaximumLength );
 329         ntpath->Buffer[1] = '?';  /* change \\?\ to \??\ */
 330         return TRUE;
 331     }
 332
 333     ptr = local;
 334     sz = RtlGetFullPathName_U(dos_path, sizeof(local), ptr, file_part);
 335     if (sz == 0) return FALSE;
 336     if (sz > sizeof(local))
 337     {
 338         if (!(ptr = RtlAllocateHeap(GetProcessHeap(), 0, sz))) return FALSE;
 339         sz = RtlGetFullPathName_U(dos_path, sz, ptr, file_part);
 340     }
 341
 342     ntpath->MaximumLength = sz + (4 /* unc\ */ + 4 /* \??\ */) * sizeof(WCHAR);
 343     ntpath->Buffer = RtlAllocateHeap(GetProcessHeap(), 0, ntpath->MaximumLength);
 344     if (!ntpath->Buffer)
 345     {
 346         if (ptr != local) RtlFreeHeap(GetProcessHeap(), 0, ptr);
 347         return FALSE;
 348     }
 349
 350     strcpyW(ntpath->Buffer, NTDosPrefixW);
 351     switch (RtlDetermineDosPathNameType_U(ptr))
 352     {
 353     case UNC_PATH: /* \\foo */
 354         offset = 2;
 355         strcatW(ntpath->Buffer, UncPfxW);
 356         break;
 357     case DEVICE_PATH: /* \\.\foo */
 358         offset = 4;
 359         break;
 360     default:
 361         offset = 0;
 362         break;
 363     }
 364
 365     strcatW(ntpath->Buffer, ptr + offset);
 366     ntpath->Length = strlenW(ntpath->Buffer) * sizeof(WCHAR);
 367
 368     if (file_part && *file_part)
 369         *file_part = ntpath->Buffer + ntpath->Length / sizeof(WCHAR) - strlenW(*file_part);
 370
 371     /* FIXME: cd filling */
 372
 373     if (ptr != local) RtlFreeHeap(GetProcessHeap(), 0, ptr);
 374     return TRUE;
 375 }
 376
 377 /******************************************************************
 378  *              RtlDosSearchPath_U
 379  *
 380  * Searchs a file of name 'name' into a ';' separated list of paths
 381  * (stored in paths)
 382  * Doesn't seem to search elsewhere than the paths list
 383  * Stores the result in buffer (file_part will point to the position
 384  * of the file name in the buffer)
 385  * FIXME:
 386  * - how long shall the paths be ??? (MAX_PATH or larger with \\?\ constructs ???)
 387  */
 388 ULONG WINAPI RtlDosSearchPath_U(LPCWSTR paths, LPCWSTR search, LPCWSTR ext,
 389                                 ULONG buffer_size, LPWSTR buffer,
 390                                 LPWSTR* file_part)
 391 {
 392     DOS_PATHNAME_TYPE type = RtlDetermineDosPathNameType_U(search);
 393     ULONG len = 0;
 394
 395     if (type == RELATIVE_PATH)
 396     {
 397         ULONG allocated = 0, needed, filelen;
 398         WCHAR *name = NULL;
 399
 400         filelen = 1 /* for \ */ + strlenW(search) + 1 /* \0 */;
 401
 402         /* Windows only checks for '.' without worrying about path components */
 403         if (strchrW( search, '.' )) ext = NULL;
 404         if (ext != NULL) filelen += strlenW(ext);
 405
 406         while (*paths)
 407         {
 408             LPCWSTR ptr;
 409
 410             for (needed = 0, ptr = paths; *ptr != 0 && *ptr++ != ';'; needed++);
 411             if (needed + filelen > allocated)
 412             {
 413                 if (!name) name = RtlAllocateHeap(GetProcessHeap(), 0,
 414                                                   (needed + filelen) * sizeof(WCHAR));
 415                 else
 416                 {
 417                     WCHAR *newname = RtlReAllocateHeap(GetProcessHeap(), 0, name,
 418                                                        (needed + filelen) * sizeof(WCHAR));
 419                     if (!newname) RtlFreeHeap(GetProcessHeap(), 0, name);
 420                     name = newname;
 421                 }
 422                 if (!name) return 0;
 423                 allocated = needed + filelen;
 424             }
 425             memmove(name, paths, needed * sizeof(WCHAR));
 426             /* append '\\' if none is present */
 427             if (needed > 0 && name[needed - 1] != '\\') name[needed++] = '\\';
 428             strcpyW(&name[needed], search);
 429             if (ext) strcatW(&name[needed], ext);
 430             if (RtlDoesFileExists_U(name))
 431             {
 432                 len = RtlGetFullPathName_U(name, buffer_size, buffer, file_part);
 433                 break;
 434             }
 435             paths = ptr;
 436         }
 437         RtlFreeHeap(GetProcessHeap(), 0, name);
 438     }
 439     else if (RtlDoesFileExists_U(search))
 440     {
 441         len = RtlGetFullPathName_U(search, buffer_size, buffer, file_part);
 442     }
 443
 444     return len;
 445 }
 446
 447
 448 /******************************************************************
 449  *              collapse_path
 450  *
 451  * Helper for RtlGetFullPathName_U.
 452  * Get rid of . and .. components in the path.
 453  */
 454 static inline void collapse_path( WCHAR *path, UINT mark )
 455 {
 456     WCHAR *p, *next;
 457
 458     /* convert every / into a \ */
 459     for (p = path; *p; p++) if (*p == '/') *p = '\\';
 460
 461     /* collapse duplicate backslashes */
 462     next = path + max( 1, mark );
 463     for (p = next; *p; p++) if (*p != '\\' || next[-1] != '\\') *next++ = *p;
 464     *next = 0;
 465
 466     p = path + mark;
 467     while (*p)
 468     {
 469         if (*p == '.')
 470         {
 471             switch(p[1])
 472             {
 473             case '\\': /* .\ component */
 474                 next = p + 2;
 475                 memmove( p, next, (strlenW(next) + 1) * sizeof(WCHAR) );
 476                 continue;
 477             case 0:  /* final . */
 478                 if (p > path + mark) p--;
 479                 *p = 0;
 480                 continue;
 481             case '.':
 482                 if (p[2] == '\\')  /* ..\ component */
 483                 {
 484                     next = p + 3;
 485                     if (p > path + mark)
 486                     {
 487                         p--;
 488                         while (p > path + mark && p[-1] != '\\') p--;
 489                     }
 490                     memmove( p, next, (strlenW(next) + 1) * sizeof(WCHAR) );
 491                     continue;
 492                 }
 493                 else if (!p[2])  /* final .. */
 494                 {
 495                     if (p > path + mark)
 496                     {
 497                         p--;
 498                         while (p > path + mark && p[-1] != '\\') p--;
 499                         if (p > path + mark) p--;
 500                     }
 501                     *p = 0;
 502                     continue;
 503                 }
 504                 break;
 505             }
 506         }
 507         /* skip to the next component */
 508         while (*p && *p != '\\') p++;
 509         if (*p == '\\') p++;
 510     }
 511
 512     /* remove trailing spaces and dots (yes, Windows really does that, don't ask) */
 513     while (p > path + mark && (p[-1] == ' ' || p[-1] == '.')) p--;
 514     *p = 0;
 515 }
 516
 517
 518 /******************************************************************
 519  *              skip_unc_prefix
 520  *
 521  * Skip the \\share\dir\ part of a file name. Helper for RtlGetFullPathName_U.
 522  */
 523 static const WCHAR *skip_unc_prefix( const WCHAR *ptr )
 524 {
 525     ptr += 2;
 526     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* share name */
 527     while (IS_SEPARATOR(*ptr)) ptr++;
 528     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* dir name */
 529     while (IS_SEPARATOR(*ptr)) ptr++;
 530     return ptr;
 531 }
 532
 533
 534 /******************************************************************
 535  *              get_full_path_helper
 536  *
 537  * Helper for RtlGetFullPathName_U
 538  * Note: name and buffer are allowed to point to the same memory spot
 539  */
 540 static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
 541 {
 542     ULONG                       reqsize = 0, mark = 0, dep = 0, deplen;
 543     DOS_PATHNAME_TYPE           type;
 544     LPWSTR                      ins_str = NULL;
 545     LPCWSTR                     ptr;
 546     const UNICODE_STRING*       cd;
 547     WCHAR                       tmp[4];
 548
 549     /* return error if name only consists of spaces */
 550     for (ptr = name; *ptr; ptr++) if (*ptr != ' ') break;
 551     if (!*ptr) return 0;
 552
 553     RtlAcquirePebLock();
 554
 555     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 556         cd = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 557     else
 558         cd = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 559
 560     switch (type = RtlDetermineDosPathNameType_U(name))
 561     {
 562     case UNC_PATH:              /* \\foo   */
 563         ptr = skip_unc_prefix( name );
 564         mark = (ptr - name);
 565         break;
 566
 567     case DEVICE_PATH:           /* \\.\foo */
 568         mark = 4;
 569         break;
 570
 571     case ABSOLUTE_DRIVE_PATH:   /* c:\foo  */
 572         reqsize = sizeof(WCHAR);
 573         tmp[0] = toupperW(name[0]);
 574         ins_str = tmp;
 575         dep = 1;
 576         mark = 3;
 577         break;
 578
 579     case RELATIVE_DRIVE_PATH:   /* c:foo   */
 580         dep = 2;
 581         if (toupperW(name[0]) != toupperW(cd->Buffer[0]) || cd->Buffer[1] != ':')
 582         {
 583             UNICODE_STRING      var, val;
 584
 585             tmp[0] = '=';
 586             tmp[1] = name[0];
 587             tmp[2] = ':';
 588             tmp[3] = '\0';
 589             var.Length = 3 * sizeof(WCHAR);
 590             var.MaximumLength = 4 * sizeof(WCHAR);
 591             var.Buffer = tmp;
 592             val.Length = 0;
 593             val.MaximumLength = size;
 594             val.Buffer = RtlAllocateHeap(GetProcessHeap(), 0, size);
 595
 596             switch (RtlQueryEnvironmentVariable_U(NULL, &var, &val))
 597             {
 598             case STATUS_SUCCESS:
 599                 /* FIXME: Win2k seems to check that the environment variable actually points
 600                  * to an existing directory. If not, root of the drive is used
 601                  * (this seems also to be the only spot in RtlGetFullPathName that the
 602                  * existence of a part of a path is checked)
 603                  */
 604                 /* fall thru */
 605             case STATUS_BUFFER_TOO_SMALL:
 606                 reqsize = val.Length + sizeof(WCHAR); /* append trailing '\\' */
 607                 val.Buffer[val.Length / sizeof(WCHAR)] = '\\';
 608                 ins_str = val.Buffer;
 609                 break;
 610             case STATUS_VARIABLE_NOT_FOUND:
 611                 reqsize = 3 * sizeof(WCHAR);
 612                 tmp[0] = name[0];
 613                 tmp[1] = ':';
 614                 tmp[2] = '\\';
 615                 ins_str = tmp;
 616                 break;
 617             default:
 618                 ERR("Unsupported status code\n");
 619                 break;
 620             }
 621             mark = 3;
 622             break;
 623         }
 624         /* fall through */
 625
 626     case RELATIVE_PATH:         /* foo     */
 627         reqsize = cd->Length;
 628         ins_str = cd->Buffer;
 629         if (cd->Buffer[1] != ':')
 630         {
 631             ptr = skip_unc_prefix( cd->Buffer );
 632             mark = ptr - cd->Buffer;
 633         }
 634         else mark = 3;
 635         break;
 636
 637     case ABSOLUTE_PATH:         /* \xxx    */
 638         if (name[0] == '/')  /* may be a Unix path */
 639         {
 640             const WCHAR *ptr = name;
 641             int drive = find_drive_root( &ptr );
 642             if (drive != -1)
 643             {
 644                 reqsize = 3 * sizeof(WCHAR);
 645                 tmp[0] = 'A' + drive;
 646                 tmp[1] = ':';
 647                 tmp[2] = '\\';
 648                 ins_str = tmp;
 649                 mark = 3;
 650                 dep = ptr - name;
 651                 break;
 652             }
 653         }
 654         if (cd->Buffer[1] == ':')
 655         {
 656             reqsize = 2 * sizeof(WCHAR);
 657             tmp[0] = cd->Buffer[0];
 658             tmp[1] = ':';
 659             ins_str = tmp;
 660             mark = 3;
 661         }
 662         else
 663         {
 664             ptr = skip_unc_prefix( cd->Buffer );
 665             reqsize = (ptr - cd->Buffer) * sizeof(WCHAR);
 666             mark = reqsize / sizeof(WCHAR);
 667             ins_str = cd->Buffer;
 668         }
 669         break;
 670
 671     case UNC_DOT_PATH:         /* \\.     */
 672         reqsize = 4 * sizeof(WCHAR);
 673         dep = 3;
 674         tmp[0] = '\\';
 675         tmp[1] = '\\';
 676         tmp[2] = '.';
 677         tmp[3] = '\\';
 678         ins_str = tmp;
 679         mark = 4;
 680         break;
 681
 682     case INVALID_PATH:
 683         goto done;
 684     }
 685
 686     /* enough space ? */
 687     deplen = strlenW(name + dep) * sizeof(WCHAR);
 688     if (reqsize + deplen + sizeof(WCHAR) > size)
 689     {
 690         /* not enough space, return need size (including terminating '\0') */
 691         reqsize += deplen + sizeof(WCHAR);
 692         goto done;
 693     }
 694
 695     memmove(buffer + reqsize / sizeof(WCHAR), name + dep, deplen + sizeof(WCHAR));
 696     if (reqsize) memcpy(buffer, ins_str, reqsize);
 697     reqsize += deplen;
 698
 699     if (ins_str && ins_str != tmp && ins_str != cd->Buffer)
 700         RtlFreeHeap(GetProcessHeap(), 0, ins_str);
 701
 702     collapse_path( buffer, mark );
 703     reqsize = strlenW(buffer) * sizeof(WCHAR);
 704
 705 done:
 706     RtlReleasePebLock();
 707     return reqsize;
 708 }
 709
 710 /******************************************************************
 711  *              RtlGetFullPathName_U  (NTDLL.@)
 712  *
 713  * Returns the number of bytes written to buffer (not including the
 714  * terminating NULL) if the function succeeds, or the required number of bytes
 715  * (including the terminating NULL) if the buffer is too small.
 716  *
 717  * file_part will point to the filename part inside buffer (except if we use
 718  * DOS device name, in which case file_in_buf is NULL)
 719  *
 720  */
 721 DWORD WINAPI RtlGetFullPathName_U(const WCHAR* name, ULONG size, WCHAR* buffer,
 722                                   WCHAR** file_part)
 723 {
 724     WCHAR*      ptr;
 725     DWORD       dosdev;
 726     DWORD       reqsize;
 727
 728     TRACE("(%s %lu %p %p)\n", debugstr_w(name), size, buffer, file_part);
 729
 730     if (!name || !*name) return 0;
 731
 732     if (file_part) *file_part = NULL;
 733
 734     /* check for DOS device name */
 735     dosdev = RtlIsDosDeviceName_U(name);
 736     if (dosdev)
 737     {
 738         DWORD   offset = HIWORD(dosdev) / sizeof(WCHAR); /* get it in WCHARs, not bytes */
 739         DWORD   sz = LOWORD(dosdev); /* in bytes */
 740
 741         if (8 + sz + 2 > size) return sz + 10;
 742         strcpyW(buffer, DeviceRootW);
 743         memmove(buffer + 4, name + offset, sz);
 744         buffer[4 + sz / sizeof(WCHAR)] = '\0';
 745         /* file_part isn't set in this case */
 746         return sz + 8;
 747     }
 748
 749     reqsize = get_full_path_helper(name, buffer, size);
 750     if (!reqsize) return 0;
 751     if (reqsize > size)
 752     {
 753         LPWSTR tmp = RtlAllocateHeap(GetProcessHeap(), 0, reqsize);
 754         reqsize = get_full_path_helper(name, tmp, reqsize);
 755         if (reqsize > size)  /* it may have worked the second time */
 756         {
 757             RtlFreeHeap(GetProcessHeap(), 0, tmp);
 758             return reqsize + sizeof(WCHAR);
 759         }
 760         memcpy( buffer, tmp, reqsize + sizeof(WCHAR) );
 761         RtlFreeHeap(GetProcessHeap(), 0, tmp);
 762     }
 763
 764     /* find file part */
 765     if (file_part && (ptr = strrchrW(buffer, '\\')) != NULL && ptr >= buffer + 2 && *++ptr)
 766         *file_part = ptr;
 767     return reqsize;
 768 }
 769
 770 /*************************************************************************
 771  * RtlGetLongestNtPathLength    [NTDLL.@]
 772  *
 773  * Get the longest allowed path length
 774  *
 775  * PARAMS
 776  *  None.
 777  *
 778  * RETURNS
 779  *  The longest allowed path length (277 characters under Win2k).
 780  */
 781 DWORD WINAPI RtlGetLongestNtPathLength(void)
 782 {
 783     return 277;
 784 }
 785
 786 /******************************************************************
 787  *             RtlIsNameLegalDOS8Dot3   (NTDLL.@)
 788  *
 789  * Returns TRUE iff unicode is a valid DOS (8+3) name.
 790  * If the name is valid, oem gets filled with the corresponding OEM string
 791  * spaces is set to TRUE if unicode contains spaces
 792  */
 793 BOOLEAN WINAPI RtlIsNameLegalDOS8Dot3( const UNICODE_STRING *unicode,
 794                                        OEM_STRING *oem, BOOLEAN *spaces )
 795 {
 796     static const char* illegal = "*?<>|\"+=,;[]:/\\\345";
 797     int dot = -1;
 798     int i;
 799     char buffer[12];
 800     OEM_STRING oem_str;
 801     BOOLEAN got_space = FALSE;
 802
 803     if (!oem)
 804     {
 805         oem_str.Length = sizeof(buffer);
 806         oem_str.MaximumLength = sizeof(buffer);
 807         oem_str.Buffer = buffer;
 808         oem = &oem_str;
 809     }
 810     if (RtlUpcaseUnicodeStringToCountedOemString( oem, unicode, FALSE ) != STATUS_SUCCESS)
 811         return FALSE;
 812
 813     if (oem->Length > 12) return FALSE;
 814
 815     /* a starting . is invalid, except for . and .. */
 816     if (oem->Buffer[0] == '.')
 817     {
 818         if (oem->Length != 1 && (oem->Length != 2 || oem->Buffer[1] != '.')) return FALSE;
 819         if (spaces) *spaces = FALSE;
 820         return TRUE;
 821     }
 822
 823     for (i = 0; i < oem->Length; i++)
 824     {
 825         switch (oem->Buffer[i])
 826         {
 827         case ' ':
 828             /* leading/trailing spaces not allowed */
 829             if (!i || i == oem->Length-1 || oem->Buffer[i+1] == '.') return FALSE;
 830             got_space = TRUE;
 831             break;
 832         case '.':
 833             if (dot != -1) return FALSE;
 834             dot = i;
 835             break;
 836         default:
 837             if (strchr(illegal, oem->Buffer[i])) return FALSE;
 838             break;
 839         }
 840     }
 841     /* check file part is shorter than 8, extension shorter than 3
 842      * dot cannot be last in string
 843      */
 844     if (dot == -1)
 845     {
 846         if (oem->Length > 8) return FALSE;
 847     }
 848     else
 849     {
 850         if (dot > 8 || (oem->Length - dot > 4) || dot == oem->Length - 1) return FALSE;
 851     }
 852     if (spaces) *spaces = got_space;
 853     return TRUE;
 854 }
 855
 856 /******************************************************************
 857  *              RtlGetCurrentDirectory_U (NTDLL.@)
 858  *
 859  */
 860 NTSTATUS WINAPI RtlGetCurrentDirectory_U(ULONG buflen, LPWSTR buf)
 861 {
 862     UNICODE_STRING*     us;
 863     ULONG               len;
 864
 865     TRACE("(%lu %p)\n", buflen, buf);
 866
 867     RtlAcquirePebLock();
 868
 869     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 870         us = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 871     else
 872         us = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 873
 874     len = us->Length / sizeof(WCHAR);
 875     if (us->Buffer[len - 1] == '\\' && us->Buffer[len - 2] != ':')
 876         len--;
 877
 878     if (buflen / sizeof(WCHAR) > len)
 879     {
 880         memcpy(buf, us->Buffer, len * sizeof(WCHAR));
 881         buf[len] = '\0';
 882     }
 883     else
 884     {
 885         len++;
 886     }
 887
 888     RtlReleasePebLock();
 889
 890     return len * sizeof(WCHAR);
 891 }
 892
 893 /******************************************************************
 894  *              RtlSetCurrentDirectory_U (NTDLL.@)
 895  *
 896  */
 897 NTSTATUS WINAPI RtlSetCurrentDirectory_U(const UNICODE_STRING* dir)
 898 {
 899     FILE_FS_DEVICE_INFORMATION device_info;
 900     OBJECT_ATTRIBUTES attr;
 901     UNICODE_STRING newdir;
 902     IO_STATUS_BLOCK io;
 903     CURDIR *curdir;
 904     HANDLE handle;
 905     NTSTATUS nts;
 906     ULONG size;
 907     PWSTR ptr;
 908
 909     newdir.Buffer = NULL;
 910
 911     RtlAcquirePebLock();
 912
 913     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 914         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir;
 915     else
 916         curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory;
 917
 918     if (!RtlDosPathNameToNtPathName_U( dir->Buffer, &newdir, NULL, NULL ))
 919     {
 920         nts = STATUS_OBJECT_NAME_INVALID;
 921         goto out;
 922     }
 923
 924     attr.Length = sizeof(attr);
 925     attr.RootDirectory = 0;
 926     attr.Attributes = OBJ_CASE_INSENSITIVE;
 927     attr.ObjectName = &newdir;
 928     attr.SecurityDescriptor = NULL;
 929     attr.SecurityQualityOfService = NULL;
 930
 931     nts = NtOpenFile( &handle, 0, &attr, &io, 0, FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT );
 932     if (nts != STATUS_SUCCESS) goto out;
 933
 934     /* don't keep the directory handle open on removable media */
 935     if (!NtQueryVolumeInformationFile( handle, &io, &device_info,
 936                                        sizeof(device_info), FileFsDeviceInformation ) &&
 937         (device_info.Characteristics & FILE_REMOVABLE_MEDIA))
 938     {
 939         NtClose( handle );
 940         handle = 0;
 941     }
 942
 943     if (curdir->Handle) NtClose( curdir->Handle );
 944     curdir->Handle = handle;
 945
 946     /* append trailing \ if missing */
 947     size = newdir.Length / sizeof(WCHAR);
 948     ptr = newdir.Buffer;
 949     ptr += 4;  /* skip \??\ prefix */
 950     size -= 4;
 951     if (size && ptr[size - 1] != '\\') ptr[size++] = '\\';
 952
 953     memcpy( curdir->DosPath.Buffer, ptr, size * sizeof(WCHAR));
 954     curdir->DosPath.Buffer[size] = 0;
 955     curdir->DosPath.Length = size * sizeof(WCHAR);
 956
 957     TRACE( "curdir now %s %p\n", debugstr_w(curdir->DosPath.Buffer), curdir->Handle );
 958
 959  out:
 960     RtlFreeUnicodeString( &newdir );
 961     RtlReleasePebLock();
 962     return nts;
 963 }