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         if (!(ptr = RtlAllocateHeap(GetProcessHeap(), 0, sz))) return FALSE;
 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     switch (RtlDetermineDosPathNameType_U(ptr))
 350     {
 351     case UNC_PATH: /* \\foo */
 352         offset = 2;
 353         strcatW(ntpath->Buffer, UncPfxW);
 354         break;
 355     case DEVICE_PATH: /* \\.\foo */
 356         offset = 4;
 357         break;
 358     default:
 359         offset = 0;
 360         break;
 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     /* remove trailing spaces and dots (yes, Windows really does that, don't ask) */
 511     while (p > path + mark && (p[-1] == ' ' || p[-1] == '.')) p--;
 512     *p = 0;
 513 }
 514
 515
 516 /******************************************************************
 517  *              skip_unc_prefix
 518  *
 519  * Skip the \\share\dir\ part of a file name. Helper for RtlGetFullPathName_U.
 520  */
 521 static const WCHAR *skip_unc_prefix( const WCHAR *ptr )
 522 {
 523     ptr += 2;
 524     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* share name */
 525     while (IS_SEPARATOR(*ptr)) ptr++;
 526     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* dir name */
 527     while (IS_SEPARATOR(*ptr)) ptr++;
 528     return ptr;
 529 }
 530
 531
 532 /******************************************************************
 533  *              get_full_path_helper
 534  *
 535  * Helper for RtlGetFullPathName_U
 536  * Note: name and buffer are allowed to point to the same memory spot
 537  */
 538 static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
 539 {
 540     ULONG                       reqsize = 0, mark = 0, dep = 0, deplen;
 541     DOS_PATHNAME_TYPE           type;
 542     LPWSTR                      ins_str = NULL;
 543     LPCWSTR                     ptr;
 544     const UNICODE_STRING*       cd;
 545     WCHAR                       tmp[4];
 546
 547     /* return error if name only consists of spaces */
 548     for (ptr = name; *ptr; ptr++) if (*ptr != ' ') break;
 549     if (!*ptr) return 0;
 550
 551     RtlAcquirePebLock();
 552
 553     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 554         cd = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 555     else
 556         cd = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 557
 558     switch (type = RtlDetermineDosPathNameType_U(name))
 559     {
 560     case UNC_PATH:              /* \\foo   */
 561         ptr = skip_unc_prefix( name );
 562         mark = (ptr - name);
 563         break;
 564
 565     case DEVICE_PATH:           /* \\.\foo */
 566         mark = 4;
 567         break;
 568
 569     case ABSOLUTE_DRIVE_PATH:   /* c:\foo  */
 570         reqsize = sizeof(WCHAR);
 571         tmp[0] = toupperW(name[0]);
 572         ins_str = tmp;
 573         dep = 1;
 574         mark = 3;
 575         break;
 576
 577     case RELATIVE_DRIVE_PATH:   /* c:foo   */
 578         dep = 2;
 579         if (toupperW(name[0]) != toupperW(cd->Buffer[0]) || cd->Buffer[1] != ':')
 580         {
 581             UNICODE_STRING      var, val;
 582
 583             tmp[0] = '=';
 584             tmp[1] = name[0];
 585             tmp[2] = ':';
 586             tmp[3] = '\0';
 587             var.Length = 3 * sizeof(WCHAR);
 588             var.MaximumLength = 4 * sizeof(WCHAR);
 589             var.Buffer = tmp;
 590             val.Length = 0;
 591             val.MaximumLength = size;
 592             val.Buffer = RtlAllocateHeap(GetProcessHeap(), 0, size);
 593
 594             switch (RtlQueryEnvironmentVariable_U(NULL, &var, &val))
 595             {
 596             case STATUS_SUCCESS:
 597                 /* FIXME: Win2k seems to check that the environment variable actually points
 598                  * to an existing directory. If not, root of the drive is used
 599                  * (this seems also to be the only spot in RtlGetFullPathName that the
 600                  * existence of a part of a path is checked)
 601                  */
 602                 /* fall thru */
 603             case STATUS_BUFFER_TOO_SMALL:
 604                 reqsize = val.Length + sizeof(WCHAR); /* append trailing '\\' */
 605                 val.Buffer[val.Length / sizeof(WCHAR)] = '\\';
 606                 ins_str = val.Buffer;
 607                 break;
 608             case STATUS_VARIABLE_NOT_FOUND:
 609                 reqsize = 3 * sizeof(WCHAR);
 610                 tmp[0] = name[0];
 611                 tmp[1] = ':';
 612                 tmp[2] = '\\';
 613                 ins_str = tmp;
 614                 break;
 615             default:
 616                 ERR("Unsupported status code\n");
 617                 break;
 618             }
 619             mark = 3;
 620             break;
 621         }
 622         /* fall through */
 623
 624     case RELATIVE_PATH:         /* foo     */
 625         reqsize = cd->Length;
 626         ins_str = cd->Buffer;
 627         if (cd->Buffer[1] != ':')
 628         {
 629             ptr = skip_unc_prefix( cd->Buffer );
 630             mark = ptr - cd->Buffer;
 631         }
 632         else mark = 3;
 633         break;
 634
 635     case ABSOLUTE_PATH:         /* \xxx    */
 636         if (name[0] == '/')  /* may be a Unix path */
 637         {
 638             const WCHAR *ptr = name;
 639             int drive = find_drive_root( &ptr );
 640             if (drive != -1)
 641             {
 642                 reqsize = 3 * sizeof(WCHAR);
 643                 tmp[0] = 'A' + drive;
 644                 tmp[1] = ':';
 645                 tmp[2] = '\\';
 646                 ins_str = tmp;
 647                 mark = 3;
 648                 dep = ptr - name;
 649                 break;
 650             }
 651         }
 652         if (cd->Buffer[1] == ':')
 653         {
 654             reqsize = 2 * sizeof(WCHAR);
 655             tmp[0] = cd->Buffer[0];
 656             tmp[1] = ':';
 657             ins_str = tmp;
 658             mark = 3;
 659         }
 660         else
 661         {
 662             ptr = skip_unc_prefix( cd->Buffer );
 663             reqsize = (ptr - cd->Buffer) * sizeof(WCHAR);
 664             mark = reqsize / sizeof(WCHAR);
 665             ins_str = cd->Buffer;
 666         }
 667         break;
 668
 669     case UNC_DOT_PATH:         /* \\.     */
 670         reqsize = 4 * sizeof(WCHAR);
 671         dep = 3;
 672         tmp[0] = '\\';
 673         tmp[1] = '\\';
 674         tmp[2] = '.';
 675         tmp[3] = '\\';
 676         ins_str = tmp;
 677         mark = 4;
 678         break;
 679
 680     case INVALID_PATH:
 681         goto done;
 682     }
 683
 684     /* enough space ? */
 685     deplen = strlenW(name + dep) * sizeof(WCHAR);
 686     if (reqsize + deplen + sizeof(WCHAR) > size)
 687     {
 688         /* not enough space, return need size (including terminating '\0') */
 689         reqsize += deplen + sizeof(WCHAR);
 690         goto done;
 691     }
 692
 693     memmove(buffer + reqsize / sizeof(WCHAR), name + dep, deplen + sizeof(WCHAR));
 694     if (reqsize) memcpy(buffer, ins_str, reqsize);
 695     reqsize += deplen;
 696
 697     if (ins_str && ins_str != tmp && ins_str != cd->Buffer)
 698         RtlFreeHeap(GetProcessHeap(), 0, ins_str);
 699
 700     collapse_path( buffer, mark );
 701     reqsize = strlenW(buffer) * sizeof(WCHAR);
 702
 703 done:
 704     RtlReleasePebLock();
 705     return reqsize;
 706 }
 707
 708 /******************************************************************
 709  *              RtlGetFullPathName_U  (NTDLL.@)
 710  *
 711  * Returns the number of bytes written to buffer (not including the
 712  * terminating NULL) if the function succeeds, or the required number of bytes
 713  * (including the terminating NULL) if the buffer is too small.
 714  *
 715  * file_part will point to the filename part inside buffer (except if we use
 716  * DOS device name, in which case file_in_buf is NULL)
 717  *
 718  */
 719 DWORD WINAPI RtlGetFullPathName_U(const WCHAR* name, ULONG size, WCHAR* buffer,
 720                                   WCHAR** file_part)
 721 {
 722     WCHAR*      ptr;
 723     DWORD       dosdev;
 724     DWORD       reqsize;
 725
 726     TRACE("(%s %lu %p %p)\n", debugstr_w(name), size, buffer, file_part);
 727
 728     if (!name || !*name) return 0;
 729
 730     if (file_part) *file_part = NULL;
 731
 732     /* check for DOS device name */
 733     dosdev = RtlIsDosDeviceName_U(name);
 734     if (dosdev)
 735     {
 736         DWORD   offset = HIWORD(dosdev) / sizeof(WCHAR); /* get it in WCHARs, not bytes */
 737         DWORD   sz = LOWORD(dosdev); /* in bytes */
 738
 739         if (8 + sz + 2 > size) return sz + 10;
 740         strcpyW(buffer, DeviceRootW);
 741         memmove(buffer + 4, name + offset, sz);
 742         buffer[4 + sz / sizeof(WCHAR)] = '\0';
 743         /* file_part isn't set in this case */
 744         return sz + 8;
 745     }
 746
 747     reqsize = get_full_path_helper(name, buffer, size);
 748     if (!reqsize) return 0;
 749     if (reqsize > size)
 750     {
 751         LPWSTR tmp = RtlAllocateHeap(GetProcessHeap(), 0, reqsize);
 752         reqsize = get_full_path_helper(name, tmp, reqsize);
 753         if (reqsize > size)  /* it may have worked the second time */
 754         {
 755             RtlFreeHeap(GetProcessHeap(), 0, tmp);
 756             return reqsize + sizeof(WCHAR);
 757         }
 758         memcpy( buffer, tmp, reqsize + sizeof(WCHAR) );
 759         RtlFreeHeap(GetProcessHeap(), 0, tmp);
 760     }
 761
 762     /* find file part */
 763     if (file_part && (ptr = strrchrW(buffer, '\\')) != NULL && ptr >= buffer + 2 && *++ptr)
 764         *file_part = ptr;
 765     return reqsize;
 766 }
 767
 768 /*************************************************************************
 769  * RtlGetLongestNtPathLength    [NTDLL.@]
 770  *
 771  * Get the longest allowed path length
 772  *
 773  * PARAMS
 774  *  None.
 775  *
 776  * RETURNS
 777  *  The longest allowed path length (277 characters under Win2k).
 778  */
 779 DWORD WINAPI RtlGetLongestNtPathLength(void)
 780 {
 781     return 277;
 782 }
 783
 784 /******************************************************************
 785  *             RtlIsNameLegalDOS8Dot3   (NTDLL.@)
 786  *
 787  * Returns TRUE iff unicode is a valid DOS (8+3) name.
 788  * If the name is valid, oem gets filled with the corresponding OEM string
 789  * spaces is set to TRUE if unicode contains spaces
 790  */
 791 BOOLEAN WINAPI RtlIsNameLegalDOS8Dot3( const UNICODE_STRING *unicode,
 792                                        OEM_STRING *oem, BOOLEAN *spaces )
 793 {
 794     static const char* illegal = "*?<>|\"+=,;[]:/\\\345";
 795     int dot = -1;
 796     int i;
 797     char buffer[12];
 798     OEM_STRING oem_str;
 799     BOOLEAN got_space = FALSE;
 800
 801     if (!oem)
 802     {
 803         oem_str.Length = sizeof(buffer);
 804         oem_str.MaximumLength = sizeof(buffer);
 805         oem_str.Buffer = buffer;
 806         oem = &oem_str;
 807     }
 808     if (RtlUpcaseUnicodeStringToCountedOemString( oem, unicode, FALSE ) != STATUS_SUCCESS)
 809         return FALSE;
 810
 811     if (oem->Length > 12) return FALSE;
 812
 813     /* a starting . is invalid, except for . and .. */
 814     if (oem->Buffer[0] == '.')
 815     {
 816         if (oem->Length != 1 && (oem->Length != 2 || oem->Buffer[1] != '.')) return FALSE;
 817         if (spaces) *spaces = FALSE;
 818         return TRUE;
 819     }
 820
 821     for (i = 0; i < oem->Length; i++)
 822     {
 823         switch (oem->Buffer[i])
 824         {
 825         case ' ':
 826             /* leading/trailing spaces not allowed */
 827             if (!i || i == oem->Length-1 || oem->Buffer[i+1] == '.') return FALSE;
 828             got_space = TRUE;
 829             break;
 830         case '.':
 831             if (dot != -1) return FALSE;
 832             dot = i;
 833             break;
 834         default:
 835             if (strchr(illegal, oem->Buffer[i])) return FALSE;
 836             break;
 837         }
 838     }
 839     /* check file part is shorter than 8, extension shorter than 3
 840      * dot cannot be last in string
 841      */
 842     if (dot == -1)
 843     {
 844         if (oem->Length > 8) return FALSE;
 845     }
 846     else
 847     {
 848         if (dot > 8 || (oem->Length - dot > 4) || dot == oem->Length - 1) return FALSE;
 849     }
 850     if (spaces) *spaces = got_space;
 851     return TRUE;
 852 }
 853
 854 /******************************************************************
 855  *              RtlGetCurrentDirectory_U (NTDLL.@)
 856  *
 857  */
 858 NTSTATUS WINAPI RtlGetCurrentDirectory_U(ULONG buflen, LPWSTR buf)
 859 {
 860     UNICODE_STRING*     us;
 861     ULONG               len;
 862
 863     TRACE("(%lu %p)\n", buflen, buf);
 864
 865     RtlAcquirePebLock();
 866
 867     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 868         us = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 869     else
 870         us = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 871
 872     len = us->Length / sizeof(WCHAR);
 873     if (us->Buffer[len - 1] == '\\' && us->Buffer[len - 2] != ':')
 874         len--;
 875
 876     if (buflen / sizeof(WCHAR) > len)
 877     {
 878         memcpy(buf, us->Buffer, len * sizeof(WCHAR));
 879         buf[len] = '\0';
 880     }
 881     else
 882     {
 883         len++;
 884     }
 885
 886     RtlReleasePebLock();
 887
 888     return len * sizeof(WCHAR);
 889 }
 890
 891 /******************************************************************
 892  *              RtlSetCurrentDirectory_U (NTDLL.@)
 893  *
 894  */
 895 NTSTATUS WINAPI RtlSetCurrentDirectory_U(const UNICODE_STRING* dir)
 896 {
 897     FILE_FS_DEVICE_INFORMATION device_info;
 898     OBJECT_ATTRIBUTES attr;
 899     UNICODE_STRING newdir;
 900     IO_STATUS_BLOCK io;
 901     CURDIR *curdir;
 902     HANDLE handle;
 903     NTSTATUS nts;
 904     ULONG size;
 905     PWSTR ptr;
 906
 907     newdir.Buffer = NULL;
 908
 909     RtlAcquirePebLock();
 910
 911     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 912         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir;
 913     else
 914         curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory;
 915
 916     if (!RtlDosPathNameToNtPathName_U( dir->Buffer, &newdir, NULL, NULL ))
 917     {
 918         nts = STATUS_OBJECT_NAME_INVALID;
 919         goto out;
 920     }
 921
 922     attr.Length = sizeof(attr);
 923     attr.RootDirectory = 0;
 924     attr.Attributes = OBJ_CASE_INSENSITIVE;
 925     attr.ObjectName = &newdir;
 926     attr.SecurityDescriptor = NULL;
 927     attr.SecurityQualityOfService = NULL;
 928
 929     nts = NtOpenFile( &handle, 0, &attr, &io, 0, FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT );
 930     if (nts != STATUS_SUCCESS) goto out;
 931
 932     /* don't keep the directory handle open on removable media */
 933     if (!NtQueryVolumeInformationFile( handle, &io, &device_info,
 934                                        sizeof(device_info), FileFsDeviceInformation ) &&
 935         (device_info.Characteristics & FILE_REMOVABLE_MEDIA))
 936     {
 937         NtClose( handle );
 938         handle = 0;
 939     }
 940
 941     if (curdir->Handle) NtClose( curdir->Handle );
 942     curdir->Handle = handle;
 943
 944     /* append trailing \ if missing */
 945     size = newdir.Length / sizeof(WCHAR);
 946     ptr = newdir.Buffer;
 947     ptr += 4;  /* skip \??\ prefix */
 948     size -= 4;
 949     if (size && ptr[size - 1] != '\\') ptr[size++] = '\\';
 950
 951     memcpy( curdir->DosPath.Buffer, ptr, size * sizeof(WCHAR));
 952     curdir->DosPath.Buffer[size] = 0;
 953     curdir->DosPath.Length = size * sizeof(WCHAR);
 954
 955     TRACE( "curdir now %s %p\n", debugstr_w(curdir->DosPath.Buffer), curdir->Handle );
 956
 957  out:
 958     RtlFreeUnicodeString( &newdir );
 959     RtlReleasePebLock();
 960     return nts;
 961 }