xpcom/obsolete/nsFileSpecUnix.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is mozilla.org code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *  Henry Sobotka <sobotka@axess.com>
  24  *  William Bonnet <wbonnet@on-x.com>
  25  *
  26  * Alternatively, the contents of this file may be used under the terms of
  27  * either of the GNU General Public License Version 2 or later (the "GPL"),
  28  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  29  * in which case the provisions of the GPL or the LGPL are applicable instead
  30  * of those above. If you wish to allow use of your version of this file only
  31  * under the terms of either the GPL or the LGPL, and not to allow others to
  32  * use your version of this file under the terms of the MPL, indicate your
  33  * decision by deleting the provisions above and replace them with the notice
  34  * and other provisions required by the GPL or the LGPL. If you do not delete
  35  * the provisions above, a recipient may use your version of this file under
  36  * the terms of any one of the MPL, the GPL or the LGPL.
  37  *
  38  * ***** END LICENSE BLOCK ***** */
  39
  40 //    This file is included by nsFileSpec.cpp, and includes the Unix-specific
  41 //    implementations.
  42
  43 #include <sys/stat.h>
  44 #include <sys/param.h>
  45 #include <errno.h>
  46 #include <dirent.h>
  47 #include <unistd.h>
  48 #include <stdlib.h>
  49 #include <limits.h>
  50 #include "xpcom-private.h"
  51 #include "nsError.h"
  52 #include "prio.h"   /* for PR_Rename */
  53 #include "nsTArray.h"
  54
  55 #if defined(_SCO_DS)
  56 #define _SVID3  /* for statvfs.h */
  57 #endif
  58
  59 #ifdef HAVE_SYS_STATVFS_H
  60 #include <sys/statvfs.h>
  61 #endif
  62
  63 #ifdef HAVE_SYS_VFS_H
  64 #include <sys/vfs.h>
  65 #endif
  66
  67 #ifdef HAVE_SYS_STATFS_H
  68 #include <sys/statfs.h>
  69 #endif
  70
  71 #ifdef HAVE_SYS_MOUNT_H
  72 #include <sys/mount.h>
  73 #undef Free
  74 #endif
  75
  76 #ifdef HAVE_STATVFS
  77 #define STATFS  statvfs
  78 #else
  79 #define STATFS  statfs
  80 #endif
  81
  82 #ifndef MAXPATHLEN
  83 #define MAXPATHLEN      1024  /* Guessing this is okay.  Works for SCO. */
  84 #endif
  85
  86 #if defined(__QNX__)
  87 #include <unix.h>       /* for realpath */
  88 #define f_bavail        f_bfree
  89 extern "C" int truncate(const char *, off_t);
  90 #endif
  91
  92 #if defined(SUNOS4)
  93 extern "C" int statfs(char *, struct statfs *);
  94 #endif
  95
  96 #if defined(OSF1)
  97 extern "C" int statvfs(const char *, struct statvfs *);
  98 #endif
  99
 100 #ifdef XP_MACOSX
 101 static void  CopyUTF8toUTF16NFC(const nsACString& aSrc, nsAString& aResult);
 102 #endif
 103
 104 //----------------------------------------------------------------------------------------
 105 void nsFileSpecHelpers::Canonify(nsSimpleCharString& ioPath, PRBool inMakeDirs)
 106 // Canonify, make absolute, and check whether directories exist
 107 //----------------------------------------------------------------------------------------
 108 {
 109     if (ioPath.IsEmpty())
 110         return;
 111     if (inMakeDirs)
 112     {
 113         const mode_t mode = 0755;
 114         nsFileSpecHelpers::MakeAllDirectories((const char*)ioPath, mode);
 115     }
 116
 117     errno = 0;  // needed?
 118
 119     if (ioPath[0] != '/')
 120     {
 121         // the ioPath that was passed in is relative.  We must cat it to the cwd.
 122         char buffer[MAXPATHLEN];
 123
 124         (void) getcwd(buffer, MAXPATHLEN);
 125
 126         strcat(buffer, "/");
 127         strcat(buffer, ioPath);
 128
 129         ioPath = buffer;
 130     }
 131 } // nsFileSpecHelpers::Canonify
 132
 133 //----------------------------------------------------------------------------------------
 134 void nsFileSpec::SetLeafName(const char* inLeafName)
 135 //----------------------------------------------------------------------------------------
 136 {
 137     mPath.LeafReplace('/', inLeafName);
 138 } // nsFileSpec::SetLeafName
 139
 140 //----------------------------------------------------------------------------------------
 141 char* nsFileSpec::GetLeafName() const
 142 //----------------------------------------------------------------------------------------
 143 {
 144 #ifndef XP_MACOSX
 145     return mPath.GetLeaf('/');
 146 #else
 147     char *name = mPath.GetLeaf('/');
 148     if (!name || !*name)
 149         return name;
 150     nsAutoString nameInNFC;
 151     CopyUTF8toUTF16NFC(nsDependentCString(name), nameInNFC);
 152     nsCRT::free(name);
 153     return nsCRT::strdup(NS_ConvertUTF16toUTF8(nameInNFC).get());
 154 #endif
 155 } // nsFileSpec::GetLeafName
 156
 157 //----------------------------------------------------------------------------------------
 158 PRBool nsFileSpec::Exists() const
 159 //----------------------------------------------------------------------------------------
 160 {
 161     return !mPath.IsEmpty() && 0 == access(mPath, F_OK);
 162 } // nsFileSpec::Exists
 163
 164 //----------------------------------------------------------------------------------------
 165 void nsFileSpec::GetModDate(TimeStamp& outStamp) const
 166 //----------------------------------------------------------------------------------------
 167 {
 168         struct stat st;
 169     if (!mPath.IsEmpty() && stat(mPath, &st) == 0)
 170         outStamp = st.st_mtime;
 171     else
 172         outStamp = 0;
 173 } // nsFileSpec::GetModDate
 174
 175 //----------------------------------------------------------------------------------------
 176 PRUint32 nsFileSpec::GetFileSize() const
 177 //----------------------------------------------------------------------------------------
 178 {
 179         struct stat st;
 180     if (!mPath.IsEmpty() && stat(mPath, &st) == 0)
 181         return (PRUint32)st.st_size;
 182     return 0;
 183 } // nsFileSpec::GetFileSize
 184
 185 //----------------------------------------------------------------------------------------
 186 PRBool nsFileSpec::IsFile() const
 187 //----------------------------------------------------------------------------------------
 188 {
 189     struct stat st;
 190     return !mPath.IsEmpty() && stat(mPath, &st) == 0 && S_ISREG(st.st_mode);
 191 } // nsFileSpec::IsFile
 192
 193 //----------------------------------------------------------------------------------------
 194 PRBool nsFileSpec::IsDirectory() const
 195 //----------------------------------------------------------------------------------------
 196 {
 197     struct stat st;
 198     return !mPath.IsEmpty() && 0 == stat(mPath, &st) && S_ISDIR(st.st_mode);
 199 } // nsFileSpec::IsDirectory
 200
 201 //----------------------------------------------------------------------------------------
 202 PRBool nsFileSpec::IsHidden() const
 203 //----------------------------------------------------------------------------------------
 204 {
 205     PRBool hidden = PR_FALSE;
 206     char *leafname = GetLeafName();
 207     if (nsnull != leafname)
 208     {
 209         // rjc: don't return ".", "..", or any file/directory that begins with a "."
 210
 211         /*        if ((!strcmp(leafname, ".")) || (!strcmp(leafname, "..")))    */
 212         if (leafname[0] == '.')
 213         {
 214             hidden = PR_TRUE;
 215         }
 216         nsCRT::free(leafname);
 217     }
 218     return hidden;
 219 } // nsFileSpec::IsHidden
 220
 221 //----------------------------------------------------------------------------------------
 222 PRBool nsFileSpec::IsSymlink() const
 223 //----------------------------------------------------------------------------------------
 224 {
 225     struct stat st;
 226     if (!mPath.IsEmpty() && stat(mPath, &st) == 0 && S_ISLNK(st.st_mode))
 227         return PR_TRUE;
 228
 229     return PR_FALSE;
 230 } // nsFileSpec::IsSymlink
 231
 232 //----------------------------------------------------------------------------------------
 233 nsresult nsFileSpec::ResolveSymlink(PRBool& wasAliased)
 234 //----------------------------------------------------------------------------------------
 235 {
 236     wasAliased = PR_FALSE;
 237
 238     char resolvedPath[MAXPATHLEN];
 239     int charCount = readlink(mPath, (char*)&resolvedPath, MAXPATHLEN);
 240     if (0 < charCount)
 241     {
 242         if (MAXPATHLEN > charCount)
 243             resolvedPath[charCount] = '\0';
 244
 245         wasAliased = PR_TRUE;
 246
 247         /* if it's not an absolute path,
 248                 replace the leaf with what got resolved */
 249         if (resolvedPath[0] != '/') {
 250                 SetLeafName(resolvedPath);
 251         }
 252         else {
 253                 mPath = (char*)&resolvedPath;
 254         }
 255
 256         char* canonicalPath = realpath((const char *)mPath, resolvedPath);
 257         NS_ASSERTION(canonicalPath, "realpath failed");
 258         if (canonicalPath) {
 259                 mPath = (char*)&resolvedPath;
 260         }
 261         else {
 262                 return NS_ERROR_FAILURE;
 263         }
 264     }
 265
 266     return NS_OK;
 267 } // nsFileSpec::ResolveSymlink
 268
 269
 270 //----------------------------------------------------------------------------------------
 271 void nsFileSpec::GetParent(nsFileSpec& outSpec) const
 272 //----------------------------------------------------------------------------------------
 273 {
 274     outSpec.mPath = mPath;
 275         char* chars = (char*)outSpec.mPath;
 276         chars[outSpec.mPath.Length() - 1] = '\0'; // avoid trailing separator, if any
 277     char* cp = strrchr(chars, '/');
 278     if (cp++)
 279             outSpec.mPath.SetLength(cp - chars); // truncate.
 280 } // nsFileSpec::GetParent
 281
 282 //----------------------------------------------------------------------------------------
 283 void nsFileSpec::operator += (const char* inRelativePath)
 284 //----------------------------------------------------------------------------------------
 285 {
 286         NS_ASSERTION(inRelativePath, "Attempt to do += with a null string");
 287
 288     if (!inRelativePath || mPath.IsEmpty())
 289         return;
 290
 291     char endChar = mPath[(int)(strlen(mPath) - 1)];
 292     if (endChar == '/')
 293         mPath += "x";
 294     else
 295         mPath += "/x";
 296     SetLeafName(inRelativePath);
 297 } // nsFileSpec::operator +=
 298
 299 //----------------------------------------------------------------------------------------
 300 void nsFileSpec::CreateDirectory(int mode)
 301 //----------------------------------------------------------------------------------------
 302 {
 303     // Note that mPath is canonical!
 304     if (mPath.IsEmpty())
 305         return;
 306     mkdir(mPath, mode);
 307 } // nsFileSpec::CreateDirectory
 308
 309 //----------------------------------------------------------------------------------------
 310 void nsFileSpec::Delete(PRBool inRecursive) const
 311 // To check if this worked, call Exists() afterwards, see?
 312 //----------------------------------------------------------------------------------------
 313 {
 314     if (IsDirectory())
 315     {
 316         if (inRecursive)
 317         {
 318             for (nsDirectoryIterator i(*this, PR_FALSE); i.Exists(); i++)
 319             {
 320                 nsFileSpec& child = (nsFileSpec&)i;
 321                 child.Delete(inRecursive);
 322             }
 323         }
 324         rmdir(mPath);
 325     }
 326     else if (!mPath.IsEmpty())
 327         remove(mPath);
 328 } // nsFileSpec::Delete
 329
 330 //----------------------------------------------------------------------------------------
 331 void nsFileSpec::RecursiveCopy(nsFileSpec newDir) const
 332 //----------------------------------------------------------------------------------------
 333 {
 334     if (IsDirectory())
 335     {
 336                 if (!(newDir.Exists()))
 337                 {
 338                         newDir.CreateDirectory();
 339                 }
 340
 341                 for (nsDirectoryIterator i(*this, PR_FALSE); i.Exists(); i++)
 342                 {
 343                         nsFileSpec& child = (nsFileSpec&)i;
 344
 345                         if (child.IsDirectory())
 346                         {
 347                                 nsFileSpec tmpDirSpec(newDir);
 348
 349                                 char *leafname = child.GetLeafName();
 350                                 tmpDirSpec += leafname;
 351                                 nsCRT::free(leafname);
 352
 353                                 child.RecursiveCopy(tmpDirSpec);
 354                         }
 355                         else
 356                         {
 357                                 child.RecursiveCopy(newDir);
 358                         }
 359                 }
 360     }
 361     else if (!mPath.IsEmpty())
 362     {
 363                 nsFileSpec& filePath = (nsFileSpec&) *this;
 364
 365                 if (!(newDir.Exists()))
 366                 {
 367                         newDir.CreateDirectory();
 368                 }
 369
 370         filePath.CopyToDir(newDir);
 371     }
 372 } // nsFileSpec::RecursiveCopy
 373
 374
 375 //----------------------------------------------------------------------------------------
 376 nsresult nsFileSpec::Truncate(PRInt32 offset) const
 377 //----------------------------------------------------------------------------------------
 378 {
 379     char* Path = nsCRT::strdup(mPath);
 380
 381     int rv = truncate(Path, offset) ;
 382
 383     nsCRT::free(Path) ;
 384
 385     if(!rv)
 386         return NS_OK ;
 387     else
 388         return NS_ERROR_FAILURE ;
 389 } // nsFileSpec::Truncate
 390
 391 //----------------------------------------------------------------------------------------
 392 nsresult nsFileSpec::Rename(const char* inNewName)
 393 //----------------------------------------------------------------------------------------
 394 {
 395         NS_ASSERTION(inNewName, "Attempt to Rename with a null string");
 396
 397     // This function should not be used to move a file on disk.
 398     if (mPath.IsEmpty() || strchr(inNewName, '/'))
 399         return NS_FILE_FAILURE;
 400
 401     char* oldPath = nsCRT::strdup(mPath);
 402
 403     SetLeafName(inNewName);
 404
 405     if (PR_Rename(oldPath, mPath) != NS_OK)
 406     {
 407         // Could not rename, set back to the original.
 408         mPath = oldPath;
 409         nsCRT::free(oldPath);
 410         return NS_FILE_FAILURE;
 411     }
 412
 413     nsCRT::free(oldPath);
 414
 415     return NS_OK;
 416 } // nsFileSpec::Rename
 417
 418 //----------------------------------------------------------------------------------------
 419 static int CrudeFileCopy_DoCopy(PRFileDesc * pFileDescIn, PRFileDesc * pFileDescOut, char * pBuf, long bufferSize)
 420 //----------------------------------------------------------------------------------------
 421 {
 422   PRInt32 rbytes, wbytes;                       // Number of bytes read and written in copy loop
 423
 424   // Copy loop
 425   //
 426   // If EOF is reached and no data is available, PR_Read returns 0. A negative
 427   // return value means an error occured
 428   rbytes = PR_Read(pFileDescIn, pBuf, bufferSize);
 429   if (rbytes < 0)                              // Test if read was unsuccessfull
 430   {                                            // Error case
 431     return -1;                                 // Return an error
 432   }
 433
 434   while (rbytes > 0)                          // While there is data to copy
 435   {
 436     // Data buffer size is only 1K ! fwrite function is able to write it in
 437     // one call. According to the man page fwrite returns a number of elements
 438     // written if an error occured. Thus there is no need to handle this case
 439     // as a normal case. Written data cannot be smaller than rbytes.
 440     wbytes = PR_Write(pFileDescOut, pBuf, rbytes);   // Copy data to output file
 441     if (wbytes != rbytes)                    // Test if all data was written
 442     {                                        // No this an error
 443       return -1;                             // Return an error
 444     }
 445
 446     // Write is done, we try to get more data
 447     rbytes = PR_Read(pFileDescIn, pBuf, bufferSize);
 448     if (rbytes < 0)                              // Test if read was unsuccessful
 449     {                                            // Error case
 450       return -1;                                 // Return an error
 451     }
 452   }
 453
 454   return 0;                          // Still here ? ok so it worked :)
 455 } // nsFileSpec::CrudeFileCopy_DoCopy
 456
 457 //----------------------------------------------------------------------------------------
 458 static int CrudeFileCopy(const char* in, const char* out)
 459 //----------------------------------------------------------------------------------------
 460 {
 461   char buf[1024];                               // Used as buffer for the copy loop
 462   PRInt32 rbytes, wbytes;                       // Number of bytes read and written in copy loop
 463   struct stat in_stat;                          // Stores informations from the stat syscall
 464   int stat_result = -1, ret;
 465   PRFileDesc * pFileDescIn, * pFileDescOut;     // Src and dest pointers
 466
 467   // Check if the pointers to filenames are valid
 468   NS_ASSERTION(in && out, "CrudeFileCopy should be called with pointers to filenames...");
 469
 470   // Check if the pointers are the same, if so, no need to copy A to A
 471   if (in == out)
 472     return 0;
 473
 474   // Check if content of the pointers are the sames, if so, no need to copy A to A
 475   if (strcmp(in,out) == 0)
 476     return 0;
 477
 478   // Retrieve the 'in' file attributes
 479   stat_result = stat(in, &in_stat);
 480   if(stat_result != 0)
 481   {
 482     // test if stat failed, it can happen if the file does not exist, is not
 483     // readable or is not available ( can happen with NFS mounts )
 484     return -1;                      // Return an error
 485   }
 486
 487   // Open the input file for binary read
 488   pFileDescIn = PR_Open(in, PR_RDONLY, 0444);
 489   if (pFileDescIn == 0)
 490   {
 491     return -1;                                  // Open failed, return an error
 492   }
 493
 494   // Open the output file for binary write
 495   pFileDescOut = PR_Open(out, PR_WRONLY | PR_CREATE_FILE, 0600);
 496   if (pFileDescOut == 0)
 497   {
 498     // Open failed, need to close input file, then return an error
 499     PR_Close(pFileDescOut);                    // Close the output file
 500     return -1;                                 // Open failed, return an error
 501   }
 502
 503   // Copy the data
 504   if (CrudeFileCopy_DoCopy(pFileDescIn, pFileDescOut, buf, sizeof(buf)) != 0)
 505   {                                            // Error case
 506     PR_Close(pFileDescOut);                    // Close output file
 507     PR_Close(pFileDescIn);                     // Close input file
 508     PR_Delete(out);                            // Destroy output file
 509     return -1;                                 // Return an error
 510   }
 511
 512   // There is no need for error handling here. This should have worked, but even
 513   // if it fails, the data are now copied to destination, thus there is no need
 514   // for the function to fail on the input file error
 515   PR_Close(pFileDescIn);
 516
 517   // It is better to call fsync and test return code before exiting to be sure
 518   // data are actually written on disk. Data loss can happen with NFS mounts
 519   if (PR_Sync(pFileDescOut) != PR_SUCCESS)
 520   {                                  // Test if the fsync function succeeded
 521     PR_Close(pFileDescOut);          // Close output file
 522     PR_Delete(out);                  // Destroy output file
 523     return -1;                       // Return an error
 524   }
 525
 526   // Copy is done, close both file
 527   if (PR_Close(pFileDescOut) != PR_SUCCESS) // Close output file
 528   {                                  // Output file was not closed :(
 529     PR_Delete(out);                  // Destroy output file
 530     return -1;                       // Return an error
 531   }
 532
 533   ret = chmod(out, in_stat.st_mode & 0777); // Set the new file file mode
 534   if (ret != 0)                      // Test if the chmod function succeeded
 535   {
 536     PR_Delete(out);                  // Destroy output file
 537     return -1;                       // Return an error
 538   }
 539
 540   return 0;                          // Still here ? ok so it worked :)
 541 } // nsFileSpec::CrudeFileCopy
 542
 543 //----------------------------------------------------------------------------------------
 544 nsresult nsFileSpec::CopyToDir(const nsFileSpec& inParentDirectory) const
 545 //----------------------------------------------------------------------------------------
 546 {
 547     // We can only copy into a directory, and (for now) can not copy entire directories
 548     nsresult result = NS_FILE_FAILURE;
 549
 550     if (inParentDirectory.IsDirectory() && (! IsDirectory() ) )
 551     {
 552         char *leafname = GetLeafName();
 553         nsSimpleCharString destPath(inParentDirectory.GetCString());
 554         destPath += "/";
 555         destPath += leafname;
 556         nsCRT::free(leafname);
 557         result = NS_FILE_RESULT(CrudeFileCopy(GetCString(), destPath));
 558     }
 559     return result;
 560 } // nsFileSpec::CopyToDir
 561
 562 //----------------------------------------------------------------------------------------
 563 nsresult nsFileSpec::MoveToDir(const nsFileSpec& inNewParentDirectory)
 564 //----------------------------------------------------------------------------------------
 565 {
 566     // We can only copy into a directory, and (for now) can not copy entire directories
 567     nsresult result = NS_FILE_FAILURE;
 568
 569     if (inNewParentDirectory.IsDirectory() && !IsDirectory())
 570     {
 571         char *leafname = GetLeafName();
 572         nsSimpleCharString destPath(inNewParentDirectory.GetCString());
 573         destPath += "/";
 574         destPath += leafname;
 575         nsCRT::free(leafname);
 576
 577         result = NS_FILE_RESULT(CrudeFileCopy(GetCString(), (const char*)destPath));
 578         if (result == NS_OK)
 579         {
 580             // cast to fix const-ness
 581             ((nsFileSpec*)this)->Delete(PR_FALSE);
 582
 583             *this = inNewParentDirectory + GetLeafName();
 584         }
 585     }
 586     return result;
 587 }
 588
 589 //----------------------------------------------------------------------------------------
 590 nsresult nsFileSpec::Execute(const char* inArgs ) const
 591 //----------------------------------------------------------------------------------------
 592 {
 593     nsresult result = NS_FILE_FAILURE;
 594
 595     if (!mPath.IsEmpty() && !IsDirectory())
 596     {
 597         nsSimpleCharString fileNameWithArgs = mPath + " " + inArgs;
 598         result = NS_FILE_RESULT(system(fileNameWithArgs));
 599     }
 600
 601     return result;
 602
 603 } // nsFileSpec::Execute
 604
 605 //----------------------------------------------------------------------------------------
 606 PRInt64 nsFileSpec::GetDiskSpaceAvailable() const
 607 //----------------------------------------------------------------------------------------
 608 {
 609     PRInt64 bytes; /* XXX dougt needs to fix this */
 610     LL_I2L(bytes , LONG_MAX); // initialize to all the space in the world?
 611
 612
 613 #if defined(HAVE_SYS_STATFS_H) || defined(HAVE_SYS_STATVFS_H)
 614
 615     char curdir [MAXPATHLEN];
 616     if (mPath.IsEmpty())
 617     {
 618         (void) getcwd(curdir, MAXPATHLEN);
 619         if (!curdir)
 620             return bytes;  /* hope for the best as we did in cheddar */
 621     }
 622     else
 623         sprintf(curdir, "%.200s", (const char*)mPath);
 624
 625     struct STATFS fs_buf;
 626 #if defined(__QNX__) && !defined(HAVE_STATVFS) /* Maybe this should be handled differently? */
 627     if (STATFS(curdir, &fs_buf, 0, 0) < 0)
 628 #else
 629     if (STATFS(curdir, &fs_buf) < 0)
 630 #endif
 631         return bytes; /* hope for the best as we did in cheddar */
 632
 633 #ifdef DEBUG_DISK_SPACE
 634     printf("DiskSpaceAvailable: %d bytes\n",
 635        fs_buf.f_bsize * (fs_buf.f_bavail - 1));
 636 #endif
 637
 638     PRInt64 bsize,bavail;
 639     LL_I2L( bsize,  fs_buf.f_bsize );
 640     LL_I2L( bavail, fs_buf.f_bavail - 1 );
 641     LL_MUL( bytes, bsize, bavail );
 642     return bytes;
 643
 644 #else
 645     /*
 646     ** This platform doesn't have statfs or statvfs, so we don't have much
 647     ** choice but to "hope for the best as we did in cheddar".
 648     */
 649     return bytes;
 650 #endif /* HAVE_SYS_STATFS_H or HAVE_SYS_STATVFS_H */
 651
 652 } // nsFileSpec::GetDiskSpace()
 653
 654 //========================================================================================
 655 //                                nsDirectoryIterator
 656 //========================================================================================
 657
 658 //----------------------------------------------------------------------------------------
 659 nsDirectoryIterator::nsDirectoryIterator(const nsFileSpec& inDirectory, PRBool resolveSymLinks)
 660 //----------------------------------------------------------------------------------------
 661     : mCurrent(inDirectory)
 662     , mExists(PR_FALSE)
 663     , mResoveSymLinks(resolveSymLinks)
 664     , mStarting(inDirectory)
 665     , mDir(nsnull)
 666
 667 {
 668     mStarting += "sysygy"; // save off the starting directory
 669     mCurrent += "sysygy"; // prepare the path for SetLeafName
 670     mDir = opendir((const char*)nsFilePath(inDirectory));
 671     ++(*this);
 672 } // nsDirectoryIterator::nsDirectoryIterator
 673
 674 //----------------------------------------------------------------------------------------
 675 nsDirectoryIterator::~nsDirectoryIterator()
 676 //----------------------------------------------------------------------------------------
 677 {
 678     if (mDir)
 679         closedir(mDir);
 680 } // nsDirectoryIterator::nsDirectoryIterator
 681
 682 //----------------------------------------------------------------------------------------
 683 nsDirectoryIterator& nsDirectoryIterator::operator ++ ()
 684 //----------------------------------------------------------------------------------------
 685 {
 686     mExists = PR_FALSE;
 687     if (!mDir)
 688         return *this;
 689     const char dot[]    = ".";
 690     const char dotdot[] = "..";
 691     struct dirent* entry = readdir(mDir);
 692     if (entry && strcmp(entry->d_name, dot) == 0)
 693         entry = readdir(mDir);
 694     if (entry && strcmp(entry->d_name, dotdot) == 0)
 695         entry = readdir(mDir);
 696     if (entry)
 697     {
 698         mExists = PR_TRUE;
 699         mCurrent = mStarting;   // restore mCurrent to be the starting directory.  ResolveSymlink() may have taken us to another directory
 700         mCurrent.SetLeafName(entry->d_name);
 701         if (mResoveSymLinks)
 702         {
 703             PRBool ignore;
 704             mCurrent.ResolveSymlink(ignore);
 705         }
 706     }
 707     return *this;
 708 } // nsDirectoryIterator::operator ++
 709
 710 //----------------------------------------------------------------------------------------
 711 nsDirectoryIterator& nsDirectoryIterator::operator -- ()
 712 //----------------------------------------------------------------------------------------
 713 {
 714     return ++(*this); // can't do it backwards.
 715 } // nsDirectoryIterator::operator --
 716
 717 // Convert a UTF-8 string to a UTF-16 string while normalizing to
 718 // Normalization Form C (composed Unicode). We need this because
 719 // Mac OS X file system uses NFD (Normalization Form D : decomposed Unicode)
 720 // while most other OS', server-side programs usually expect NFC.
 721
 722 #ifdef XP_MACOSX
 723 typedef void (*UnicodeNormalizer) (CFMutableStringRef, CFStringNormalizationForm);
 724 static void CopyUTF8toUTF16NFC(const nsACString& aSrc, nsAString& aResult)
 725 {
 726     static PRBool sChecked = PR_FALSE;
 727     static UnicodeNormalizer sUnicodeNormalizer = NULL;
 728
 729     // CFStringNormalize was not introduced until Mac OS 10.2
 730     if (!sChecked) {
 731         CFBundleRef carbonBundle =
 732             CFBundleGetBundleWithIdentifier(CFSTR("com.apple.Carbon"));
 733         if (carbonBundle)
 734             sUnicodeNormalizer = (UnicodeNormalizer)
 735                 ::CFBundleGetFunctionPointerForName(carbonBundle,
 736                                                     CFSTR("CFStringNormalize"));
 737         sChecked = PR_TRUE;
 738     }
 739
 740     if (!sUnicodeNormalizer) {  // OS X 10.1 or earlier
 741         CopyUTF8toUTF16(aSrc, aResult);
 742         return;
 743     }
 744
 745     const nsAFlatCString &inFlatSrc = PromiseFlatCString(aSrc);
 746
 747     // The number of 16bit code units in a UTF-16 string will never be
 748     // larger than the number of bytes in the corresponding UTF-8 string.
 749     CFMutableStringRef inStr =
 750         ::CFStringCreateMutable(NULL, inFlatSrc.Length());
 751
 752     if (!inStr) {
 753         CopyUTF8toUTF16(aSrc, aResult);
 754         return;
 755     }
 756
 757     ::CFStringAppendCString(inStr, inFlatSrc.get(), kCFStringEncodingUTF8);
 758
 759     sUnicodeNormalizer(inStr, kCFStringNormalizationFormC);
 760
 761     CFIndex length = CFStringGetLength(inStr);
 762     const UniChar* chars = CFStringGetCharactersPtr(inStr);
 763
 764     if (chars)
 765         aResult.Assign(chars, length);
 766     else {
 767         nsAutoTArray<UniChar, 512> buffer;
 768         if (buffer.SetLength(length)) {
 769             CFStringGetCharacters(inStr, CFRangeMake(0, length), buffer.Elements());
 770             aResult.Assign(buffer.Elements(), length);
 771         }
 772         else
 773             CopyUTF8toUTF16(aSrc, aResult);
 774     }
 775     CFRelease(inStr);
 776 }
 777 #endif