src/common/string.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        string.cpp
   3 // Purpose:     wxString class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13   #pragma implementation "string.h"
  14 #endif
  15
  16 /*
  17  * About ref counting:
  18  *  1) all empty strings use g_strEmpty, nRefs = -1 (set in Init())
  19  *  2) AllocBuffer() sets nRefs to 1, Lock() increments it by one
  20  *  3) Unlock() decrements nRefs and frees memory if it goes to 0
  21  */
  22
  23 // ===========================================================================
  24 // headers, declarations, constants
  25 // ===========================================================================
  26
  27 // For compilers that support precompilation, includes "wx.h".
  28 #include "wx/wxprec.h"
  29
  30 #ifdef __BORLANDC__
  31   #pragma hdrstop
  32 #endif
  33
  34 #ifndef WX_PRECOMP
  35   #include "wx/defs.h"
  36   #include "wx/string.h"
  37   #include "wx/intl.h"
  38 #endif
  39
  40 #include <ctype.h>
  41 #include <string.h>
  42 #include <stdlib.h>
  43
  44 #ifdef __SALFORDC__
  45   #include <clib.h>
  46 #endif
  47
  48 #if wxUSE_WCSRTOMBS
  49   #include <wchar.h>    // for wcsrtombs(), see comments where it's used
  50 #endif // GNU
  51
  52 #ifdef  WXSTRING_IS_WXOBJECT
  53   IMPLEMENT_DYNAMIC_CLASS(wxString, wxObject)
  54 #endif  //WXSTRING_IS_WXOBJECT
  55
  56 // allocating extra space for each string consumes more memory but speeds up
  57 // the concatenation operations (nLen is the current string's length)
  58 // NB: EXTRA_ALLOC must be >= 0!
  59 #define EXTRA_ALLOC       (19 - nLen % 16)
  60
  61 // ---------------------------------------------------------------------------
  62 // static class variables definition
  63 // ---------------------------------------------------------------------------
  64
  65 #ifdef  wxSTD_STRING_COMPATIBILITY
  66   const size_t wxString::npos = wxSTRING_MAXLEN;
  67 #endif // wxSTD_STRING_COMPATIBILITY
  68
  69 // ----------------------------------------------------------------------------
  70 // static data
  71 // ----------------------------------------------------------------------------
  72
  73 // for an empty string, GetStringData() will return this address: this
  74 // structure has the same layout as wxStringData and it's data() method will
  75 // return the empty string (dummy pointer)
  76 static const struct
  77 {
  78   wxStringData data;
  79   char dummy;
  80 } g_strEmpty = { {-1, 0, 0}, '\0' };
  81
  82 // empty C style string: points to 'string data' byte of g_strEmpty
  83 extern const char WXDLLEXPORT *g_szNul = &g_strEmpty.dummy;
  84
  85 // ----------------------------------------------------------------------------
  86 // conditional compilation
  87 // ----------------------------------------------------------------------------
  88
  89 // we want to find out if the current platform supports vsnprintf()-like
  90 // function: for Unix this is done with configure, for Windows we test the
  91 // compiler explicitly.
  92 #ifdef __WXMSW__
  93     #ifdef __VISUALC__
  94         #define wxVsprintf     _vsnprintf
  95     #endif
  96 #else   // !Windows
  97     #ifdef HAVE_VSNPRINTF
  98         #define wxVsprintf       vsnprintf
  99     #endif
 100 #endif  // Windows/!Windows
 101
 102 #ifndef wxVsprintf
 103     // in this case we'll use vsprintf() (which is ANSI and thus should be
 104     // always available), but it's unsafe because it doesn't check for buffer
 105     // size - so give a warning
 106     #define wxVsprintf(buffer,len,format,argptr) vsprintf(buffer,format, argptr)
 107 #if defined(__VISUALC__)
 108     #pragma message("Using sprintf() because no snprintf()-like function defined")
 109 #elif defined(__GNUG__)
 110     #warning "Using sprintf() because no snprintf()-like function defined"
 111 #elif defined(__MWERKS__)
 112         #warning "Using sprintf() because no snprintf()-like function defined"
 113 #elif defined(__WATCOMC__)
 114     // No warning
 115 #elif defined(__BORLANDC__)
 116         // No warning
 117 #elif defined(__SUNCC__)
 118     // nothing -- I don't know about "#warning" for Sun's CC
 119 #else
 120     // change this to some analogue of '#warning' for your compiler
 121     #error "Using sprintf() because no snprintf()-like function defined"
 122 #endif //compiler
 123
 124 #endif // no vsnprintf
 125
 126 // ----------------------------------------------------------------------------
 127 // global functions
 128 // ----------------------------------------------------------------------------
 129
 130 #ifdef  wxSTD_STRING_COMPATIBILITY
 131
 132 // MS Visual C++ version 5.0 provides the new STL headers as well as the old
 133 // iostream ones.
 134 //
 135 // ATTN: you can _not_ use both of these in the same program!
 136
 137 istream& operator>>(istream& is, wxString& WXUNUSED(str))
 138 {
 139 #if 0
 140   int w = is.width(0);
 141   if ( is.ipfx(0) ) {
 142     streambuf *sb = is.rdbuf();
 143     str.erase();
 144     while ( true ) {
 145       int ch = sb->sbumpc ();
 146       if ( ch == EOF ) {
 147         is.setstate(ios::eofbit);
 148         break;
 149       }
 150       else if ( isspace(ch) ) {
 151         sb->sungetc();
 152         break;
 153       }
 154
 155       str += ch;
 156       if ( --w == 1 )
 157         break;
 158     }
 159   }
 160
 161   is.isfx();
 162   if ( str.length() == 0 )
 163     is.setstate(ios::failbit);
 164 #endif
 165   return is;
 166 }
 167
 168 #endif  //std::string compatibility
 169
 170 // ----------------------------------------------------------------------------
 171 // private classes
 172 // ----------------------------------------------------------------------------
 173
 174 // this small class is used to gather statistics for performance tuning
 175 //#define WXSTRING_STATISTICS
 176 #ifdef  WXSTRING_STATISTICS
 177   class Averager
 178   {
 179   public:
 180     Averager(const char *sz) { m_sz = sz; m_nTotal = m_nCount = 0; }
 181    ~Averager()
 182    { printf("wxString: average %s = %f\n", m_sz, ((float)m_nTotal)/m_nCount); }
 183
 184     void Add(size_t n) { m_nTotal += n; m_nCount++; }
 185
 186   private:
 187     size_t m_nCount, m_nTotal;
 188     const char *m_sz;
 189   } g_averageLength("allocation size"),
 190     g_averageSummandLength("summand length"),
 191     g_averageConcatHit("hit probability in concat"),
 192     g_averageInitialLength("initial string length");
 193
 194   #define STATISTICS_ADD(av, val) g_average##av.Add(val)
 195 #else
 196   #define STATISTICS_ADD(av, val)
 197 #endif // WXSTRING_STATISTICS
 198
 199 // ===========================================================================
 200 // wxString class core
 201 // ===========================================================================
 202
 203 // ---------------------------------------------------------------------------
 204 // construction
 205 // ---------------------------------------------------------------------------
 206
 207 // constructs string of <nLength> copies of character <ch>
 208 wxString::wxString(char ch, size_t nLength)
 209 {
 210   Init();
 211
 212   if ( nLength > 0 ) {
 213     AllocBuffer(nLength);
 214
 215     wxASSERT( sizeof(char) == 1 );  // can't use memset if not
 216
 217     memset(m_pchData, ch, nLength);
 218   }
 219 }
 220
 221 // takes nLength elements of psz starting at nPos
 222 void wxString::InitWith(const char *psz, size_t nPos, size_t nLength)
 223 {
 224   Init();
 225
 226   wxASSERT( nPos <= Strlen(psz) );
 227
 228   if ( nLength == wxSTRING_MAXLEN )
 229     nLength = Strlen(psz + nPos);
 230
 231   STATISTICS_ADD(InitialLength, nLength);
 232
 233   if ( nLength > 0 ) {
 234     // trailing '\0' is written in AllocBuffer()
 235     AllocBuffer(nLength);
 236     memcpy(m_pchData, psz + nPos, nLength*sizeof(char));
 237   }
 238 }
 239
 240 // the same as previous constructor, but for compilers using unsigned char
 241 wxString::wxString(const unsigned char* psz, size_t nLength)
 242 {
 243   InitWith((const char *)psz, 0, nLength);
 244 }
 245
 246 #ifdef  wxSTD_STRING_COMPATIBILITY
 247
 248 // poor man's iterators are "void *" pointers
 249 wxString::wxString(const void *pStart, const void *pEnd)
 250 {
 251   InitWith((const char *)pStart, 0,
 252            (const char *)pEnd - (const char *)pStart);
 253 }
 254
 255 #endif  //std::string compatibility
 256
 257 // from wide string
 258 wxString::wxString(const wchar_t *pwz)
 259 {
 260   // first get necessary size
 261
 262   // NB: GNU libc5 wcstombs() is completely broken, don't use it (it doesn't
 263   //     honor the 3rd parameter, thus it will happily crash here).
 264 #if wxUSE_WCSRTOMBS
 265   // don't know if it's really needed (or if we can pass NULL), but better safe
 266   // than quick
 267   mbstate_t mbstate;
 268   size_t nLen = wcsrtombs((char *) NULL, &pwz, 0, &mbstate);
 269 #else  // !GNU libc
 270   size_t nLen = wcstombs((char *) NULL, pwz, 0);
 271 #endif // GNU
 272
 273   // empty?
 274   if ( nLen != 0 ) {
 275     AllocBuffer(nLen);
 276     wcstombs(m_pchData, pwz, nLen);
 277   }
 278   else {
 279     Init();
 280   }
 281 }
 282
 283 // ---------------------------------------------------------------------------
 284 // memory allocation
 285 // ---------------------------------------------------------------------------
 286
 287 // allocates memory needed to store a C string of length nLen
 288 void wxString::AllocBuffer(size_t nLen)
 289 {
 290   wxASSERT( nLen >  0         );    //
 291   wxASSERT( nLen <= INT_MAX-1 );    // max size (enough room for 1 extra)
 292
 293   STATISTICS_ADD(Length, nLen);
 294
 295   // allocate memory:
 296   // 1) one extra character for '\0' termination
 297   // 2) sizeof(wxStringData) for housekeeping info
 298   wxStringData* pData = (wxStringData*)
 299     malloc(sizeof(wxStringData) + (nLen + EXTRA_ALLOC + 1)*sizeof(char));
 300   pData->nRefs        = 1;
 301   pData->nDataLength  = nLen;
 302   pData->nAllocLength = nLen + EXTRA_ALLOC;
 303   m_pchData           = pData->data();  // data starts after wxStringData
 304   m_pchData[nLen]     = '\0';
 305 }
 306
 307 // must be called before changing this string
 308 void wxString::CopyBeforeWrite()
 309 {
 310   wxStringData* pData = GetStringData();
 311
 312   if ( pData->IsShared() ) {
 313     pData->Unlock();                // memory not freed because shared
 314     size_t nLen = pData->nDataLength;
 315     AllocBuffer(nLen);
 316     memcpy(m_pchData, pData->data(), nLen*sizeof(char));
 317   }
 318
 319   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 320 }
 321
 322 // must be called before replacing contents of this string
 323 void wxString::AllocBeforeWrite(size_t nLen)
 324 {
 325   wxASSERT( nLen != 0 );  // doesn't make any sense
 326
 327   // must not share string and must have enough space
 328   wxStringData* pData = GetStringData();
 329   if ( pData->IsShared() || (nLen > pData->nAllocLength) ) {
 330     // can't work with old buffer, get new one
 331     pData->Unlock();
 332     AllocBuffer(nLen);
 333   }
 334   else {
 335     // update the string length
 336     pData->nDataLength = nLen;
 337   }
 338
 339   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 340 }
 341
 342 // allocate enough memory for nLen characters
 343 void wxString::Alloc(size_t nLen)
 344 {
 345   wxStringData *pData = GetStringData();
 346   if ( pData->nAllocLength <= nLen ) {
 347     if ( pData->IsEmpty() ) {
 348       nLen += EXTRA_ALLOC;
 349
 350       wxStringData* pData = (wxStringData*)
 351         malloc(sizeof(wxStringData) + (nLen + 1)*sizeof(char));
 352       pData->nRefs = 1;
 353       pData->nDataLength = 0;
 354       pData->nAllocLength = nLen;
 355       m_pchData = pData->data();  // data starts after wxStringData
 356       m_pchData[0u] = '\0';
 357     }
 358     else if ( pData->IsShared() ) {
 359       pData->Unlock();                // memory not freed because shared
 360       size_t nOldLen = pData->nDataLength;
 361       AllocBuffer(nLen);
 362       memcpy(m_pchData, pData->data(), nOldLen*sizeof(char));
 363     }
 364     else {
 365       nLen += EXTRA_ALLOC;
 366
 367       wxStringData *p = (wxStringData *)
 368         realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(char));
 369
 370       if ( p == NULL ) {
 371         // @@@ what to do on memory error?
 372         return;
 373       }
 374
 375       // it's not important if the pointer changed or not (the check for this
 376       // is not faster than assigning to m_pchData in all cases)
 377       p->nAllocLength = nLen;
 378       m_pchData = p->data();
 379     }
 380   }
 381   //else: we've already got enough
 382 }
 383
 384 // shrink to minimal size (releasing extra memory)
 385 void wxString::Shrink()
 386 {
 387   wxStringData *pData = GetStringData();
 388
 389   // this variable is unused in release build, so avoid the compiler warning by
 390   // just not declaring it
 391 #ifdef __WXDEBUG__
 392   void *p =
 393 #endif
 394   realloc(pData, sizeof(wxStringData) + (pData->nDataLength + 1)*sizeof(char));
 395
 396   wxASSERT( p != NULL );  // can't free memory?
 397   wxASSERT( p == pData ); // we're decrementing the size - block shouldn't move!
 398 }
 399
 400 // get the pointer to writable buffer of (at least) nLen bytes
 401 char *wxString::GetWriteBuf(size_t nLen)
 402 {
 403   AllocBeforeWrite(nLen);
 404
 405   wxASSERT( GetStringData()->nRefs == 1 );
 406   GetStringData()->Validate(FALSE);
 407
 408   return m_pchData;
 409 }
 410
 411 // put string back in a reasonable state after GetWriteBuf
 412 void wxString::UngetWriteBuf()
 413 {
 414   GetStringData()->nDataLength = strlen(m_pchData);
 415   GetStringData()->Validate(TRUE);
 416 }
 417
 418 // ---------------------------------------------------------------------------
 419 // data access
 420 // ---------------------------------------------------------------------------
 421
 422 // all functions are inline in string.h
 423
 424 // ---------------------------------------------------------------------------
 425 // assignment operators
 426 // ---------------------------------------------------------------------------
 427
 428 // helper function: does real copy
 429 void wxString::AssignCopy(size_t nSrcLen, const char *pszSrcData)
 430 {
 431   if ( nSrcLen == 0 ) {
 432     Reinit();
 433   }
 434   else {
 435     AllocBeforeWrite(nSrcLen);
 436     memcpy(m_pchData, pszSrcData, nSrcLen*sizeof(char));
 437     GetStringData()->nDataLength = nSrcLen;
 438     m_pchData[nSrcLen] = '\0';
 439   }
 440 }
 441
 442 // assigns one string to another
 443 wxString& wxString::operator=(const wxString& stringSrc)
 444 {
 445   wxASSERT( stringSrc.GetStringData()->IsValid() );
 446
 447   // don't copy string over itself
 448   if ( m_pchData != stringSrc.m_pchData ) {
 449     if ( stringSrc.GetStringData()->IsEmpty() ) {
 450       Reinit();
 451     }
 452     else {
 453       // adjust references
 454       GetStringData()->Unlock();
 455       m_pchData = stringSrc.m_pchData;
 456       GetStringData()->Lock();
 457     }
 458   }
 459
 460   return *this;
 461 }
 462
 463 // assigns a single character
 464 wxString& wxString::operator=(char ch)
 465 {
 466   AssignCopy(1, &ch);
 467   return *this;
 468 }
 469
 470 // assigns C string
 471 wxString& wxString::operator=(const char *psz)
 472 {
 473   AssignCopy(Strlen(psz), psz);
 474   return *this;
 475 }
 476
 477 // same as 'signed char' variant
 478 wxString& wxString::operator=(const unsigned char* psz)
 479 {
 480   *this = (const char *)psz;
 481   return *this;
 482 }
 483
 484 wxString& wxString::operator=(const wchar_t *pwz)
 485 {
 486   wxString str(pwz);
 487   *this = str;
 488   return *this;
 489 }
 490
 491 // ---------------------------------------------------------------------------
 492 // string concatenation
 493 // ---------------------------------------------------------------------------
 494
 495 // add something to this string
 496 void wxString::ConcatSelf(int nSrcLen, const char *pszSrcData)
 497 {
 498   STATISTICS_ADD(SummandLength, nSrcLen);
 499
 500   // concatenating an empty string is a NOP
 501   if ( nSrcLen > 0 ) {
 502     wxStringData *pData = GetStringData();
 503     size_t nLen = pData->nDataLength;
 504     size_t nNewLen = nLen + nSrcLen;
 505
 506     // alloc new buffer if current is too small
 507     if ( pData->IsShared() ) {
 508       STATISTICS_ADD(ConcatHit, 0);
 509
 510       // we have to allocate another buffer
 511       wxStringData* pOldData = GetStringData();
 512       AllocBuffer(nNewLen);
 513       memcpy(m_pchData, pOldData->data(), nLen*sizeof(char));
 514       pOldData->Unlock();
 515     }
 516     else if ( nNewLen > pData->nAllocLength ) {
 517       STATISTICS_ADD(ConcatHit, 0);
 518
 519       // we have to grow the buffer
 520       Alloc(nNewLen);
 521     }
 522     else {
 523       STATISTICS_ADD(ConcatHit, 1);
 524
 525       // the buffer is already big enough
 526     }
 527
 528     // should be enough space
 529     wxASSERT( nNewLen <= GetStringData()->nAllocLength );
 530
 531     // fast concatenation - all is done in our buffer
 532     memcpy(m_pchData + nLen, pszSrcData, nSrcLen*sizeof(char));
 533
 534     m_pchData[nNewLen] = '\0';              // put terminating '\0'
 535     GetStringData()->nDataLength = nNewLen; // and fix the length
 536   }
 537   //else: the string to append was empty
 538 }
 539
 540 /*
 541  * concatenation functions come in 5 flavours:
 542  *  string + string
 543  *  char   + string      and      string + char
 544  *  C str  + string      and      string + C str
 545  */
 546
 547 wxString operator+(const wxString& string1, const wxString& string2)
 548 {
 549   wxASSERT( string1.GetStringData()->IsValid() );
 550   wxASSERT( string2.GetStringData()->IsValid() );
 551
 552   wxString s = string1;
 553   s += string2;
 554
 555   return s;
 556 }
 557
 558 wxString operator+(const wxString& string, char ch)
 559 {
 560   wxASSERT( string.GetStringData()->IsValid() );
 561
 562   wxString s = string;
 563   s += ch;
 564
 565   return s;
 566 }
 567
 568 wxString operator+(char ch, const wxString& string)
 569 {
 570   wxASSERT( string.GetStringData()->IsValid() );
 571
 572   wxString s = ch;
 573   s += string;
 574
 575   return s;
 576 }
 577
 578 wxString operator+(const wxString& string, const char *psz)
 579 {
 580   wxASSERT( string.GetStringData()->IsValid() );
 581
 582   wxString s;
 583   s.Alloc(Strlen(psz) + string.Len());
 584   s = string;
 585   s += psz;
 586
 587   return s;
 588 }
 589
 590 wxString operator+(const char *psz, const wxString& string)
 591 {
 592   wxASSERT( string.GetStringData()->IsValid() );
 593
 594   wxString s;
 595   s.Alloc(Strlen(psz) + string.Len());
 596   s = psz;
 597   s += string;
 598
 599   return s;
 600 }
 601
 602 // ===========================================================================
 603 // other common string functions
 604 // ===========================================================================
 605
 606 // ---------------------------------------------------------------------------
 607 // simple sub-string extraction
 608 // ---------------------------------------------------------------------------
 609
 610 // helper function: clone the data attached to this string
 611 void wxString::AllocCopy(wxString& dest, int nCopyLen, int nCopyIndex) const
 612 {
 613   if ( nCopyLen == 0 ) {
 614     dest.Init();
 615   }
 616   else {
 617     dest.AllocBuffer(nCopyLen);
 618     memcpy(dest.m_pchData, m_pchData + nCopyIndex, nCopyLen*sizeof(char));
 619   }
 620 }
 621
 622 // extract string of length nCount starting at nFirst
 623 wxString wxString::Mid(size_t nFirst, size_t nCount) const
 624 {
 625   wxStringData *pData = GetStringData();
 626   size_t nLen = pData->nDataLength;
 627
 628   // default value of nCount is wxSTRING_MAXLEN and means "till the end"
 629   if ( nCount == wxSTRING_MAXLEN )
 630   {
 631     nCount = nLen - nFirst;
 632   }
 633
 634   // out-of-bounds requests return sensible things
 635   if ( nFirst + nCount > nLen )
 636   {
 637     nCount = nLen - nFirst;
 638   }
 639
 640   if ( nFirst > nLen )
 641   {
 642     // AllocCopy() will return empty string
 643     nCount = 0;
 644   }
 645
 646   wxString dest;
 647   AllocCopy(dest, nCount, nFirst);
 648
 649   return dest;
 650 }
 651
 652 // extract nCount last (rightmost) characters
 653 wxString wxString::Right(size_t nCount) const
 654 {
 655   if ( nCount > (size_t)GetStringData()->nDataLength )
 656     nCount = GetStringData()->nDataLength;
 657
 658   wxString dest;
 659   AllocCopy(dest, nCount, GetStringData()->nDataLength - nCount);
 660   return dest;
 661 }
 662
 663 // get all characters after the last occurence of ch
 664 // (returns the whole string if ch not found)
 665 wxString wxString::AfterLast(char ch) const
 666 {
 667   wxString str;
 668   int iPos = Find(ch, TRUE);
 669   if ( iPos == wxNOT_FOUND )
 670     str = *this;
 671   else
 672     str = c_str() + iPos + 1;
 673
 674   return str;
 675 }
 676
 677 // extract nCount first (leftmost) characters
 678 wxString wxString::Left(size_t nCount) const
 679 {
 680   if ( nCount > (size_t)GetStringData()->nDataLength )
 681     nCount = GetStringData()->nDataLength;
 682
 683   wxString dest;
 684   AllocCopy(dest, nCount, 0);
 685   return dest;
 686 }
 687
 688 // get all characters before the first occurence of ch
 689 // (returns the whole string if ch not found)
 690 wxString wxString::BeforeFirst(char ch) const
 691 {
 692   wxString str;
 693   for ( const char *pc = m_pchData; *pc != '\0' && *pc != ch; pc++ )
 694     str += *pc;
 695
 696   return str;
 697 }
 698
 699 /// get all characters before the last occurence of ch
 700 /// (returns empty string if ch not found)
 701 wxString wxString::BeforeLast(char ch) const
 702 {
 703   wxString str;
 704   int iPos = Find(ch, TRUE);
 705   if ( iPos != wxNOT_FOUND && iPos != 0 )
 706     str = wxString(c_str(), iPos);
 707
 708   return str;
 709 }
 710
 711 /// get all characters after the first occurence of ch
 712 /// (returns empty string if ch not found)
 713 wxString wxString::AfterFirst(char ch) const
 714 {
 715   wxString str;
 716   int iPos = Find(ch);
 717   if ( iPos != wxNOT_FOUND )
 718     str = c_str() + iPos + 1;
 719
 720   return str;
 721 }
 722
 723 // replace first (or all) occurences of some substring with another one
 724 size_t wxString::Replace(const char *szOld, const char *szNew, bool bReplaceAll)
 725 {
 726   size_t uiCount = 0;   // count of replacements made
 727
 728   size_t uiOldLen = Strlen(szOld);
 729
 730   wxString strTemp;
 731   const char *pCurrent = m_pchData;
 732   const char *pSubstr;
 733   while ( *pCurrent != '\0' ) {
 734     pSubstr = strstr(pCurrent, szOld);
 735     if ( pSubstr == NULL ) {
 736       // strTemp is unused if no replacements were made, so avoid the copy
 737       if ( uiCount == 0 )
 738         return 0;
 739
 740       strTemp += pCurrent;    // copy the rest
 741       break;                  // exit the loop
 742     }
 743     else {
 744       // take chars before match
 745       strTemp.ConcatSelf(pSubstr - pCurrent, pCurrent);
 746       strTemp += szNew;
 747       pCurrent = pSubstr + uiOldLen;  // restart after match
 748
 749       uiCount++;
 750
 751       // stop now?
 752       if ( !bReplaceAll ) {
 753         strTemp += pCurrent;    // copy the rest
 754         break;                  // exit the loop
 755       }
 756     }
 757   }
 758
 759   // only done if there were replacements, otherwise would have returned above
 760   *this = strTemp;
 761
 762   return uiCount;
 763 }
 764
 765 bool wxString::IsAscii() const
 766 {
 767   const char *s = (const char*) *this;
 768   while(*s){
 769     if(!isascii(*s)) return(FALSE);
 770     s++;
 771   }
 772   return(TRUE);
 773 }
 774
 775 bool wxString::IsWord() const
 776 {
 777   const char *s = (const char*) *this;
 778   while(*s){
 779     if(!isalpha(*s)) return(FALSE);
 780     s++;
 781   }
 782   return(TRUE);
 783 }
 784
 785 bool wxString::IsNumber() const
 786 {
 787   const char *s = (const char*) *this;
 788   while(*s){
 789     if(!isdigit(*s)) return(FALSE);
 790     s++;
 791   }
 792   return(TRUE);
 793 }
 794
 795 wxString wxString::Strip(stripType w) const
 796 {
 797     wxString s = *this;
 798     if ( w & leading ) s.Trim(FALSE);
 799     if ( w & trailing ) s.Trim(TRUE);
 800     return s;
 801 }
 802
 803 // ---------------------------------------------------------------------------
 804 // case conversion
 805 // ---------------------------------------------------------------------------
 806
 807 wxString& wxString::MakeUpper()
 808 {
 809   CopyBeforeWrite();
 810
 811   for ( char *p = m_pchData; *p; p++ )
 812     *p = (char)toupper(*p);
 813
 814   return *this;
 815 }
 816
 817 wxString& wxString::MakeLower()
 818 {
 819   CopyBeforeWrite();
 820
 821   for ( char *p = m_pchData; *p; p++ )
 822     *p = (char)tolower(*p);
 823
 824   return *this;
 825 }
 826
 827 // ---------------------------------------------------------------------------
 828 // trimming and padding
 829 // ---------------------------------------------------------------------------
 830
 831 // trims spaces (in the sense of isspace) from left or right side
 832 wxString& wxString::Trim(bool bFromRight)
 833 {
 834   // first check if we're going to modify the string at all
 835   if ( !IsEmpty() &&
 836        (
 837         (bFromRight && isspace(GetChar(Len() - 1))) ||
 838         (!bFromRight && isspace(GetChar(0u)))
 839        )
 840      )
 841   {
 842     // ok, there is at least one space to trim
 843     CopyBeforeWrite();
 844
 845     if ( bFromRight )
 846     {
 847       // find last non-space character
 848       char *psz = m_pchData + GetStringData()->nDataLength - 1;
 849       while ( isspace(*psz) && (psz >= m_pchData) )
 850         psz--;
 851
 852       // truncate at trailing space start
 853       *++psz = '\0';
 854       GetStringData()->nDataLength = psz - m_pchData;
 855     }
 856     else
 857     {
 858       // find first non-space character
 859       const char *psz = m_pchData;
 860       while ( isspace(*psz) )
 861         psz++;
 862
 863       // fix up data and length
 864       int nDataLength = GetStringData()->nDataLength - (psz - (const char*) m_pchData);
 865       memmove(m_pchData, psz, (nDataLength + 1)*sizeof(char));
 866       GetStringData()->nDataLength = nDataLength;
 867     }
 868   }
 869
 870   return *this;
 871 }
 872
 873 // adds nCount characters chPad to the string from either side
 874 wxString& wxString::Pad(size_t nCount, char chPad, bool bFromRight)
 875 {
 876   wxString s(chPad, nCount);
 877
 878   if ( bFromRight )
 879     *this += s;
 880   else
 881   {
 882     s += *this;
 883     *this = s;
 884   }
 885
 886   return *this;
 887 }
 888
 889 // truncate the string
 890 wxString& wxString::Truncate(size_t uiLen)
 891 {
 892   if ( uiLen < Len() ) {
 893     CopyBeforeWrite();
 894
 895     *(m_pchData + uiLen) = '\0';
 896     GetStringData()->nDataLength = uiLen;
 897   }
 898   //else: nothing to do, string is already short enough
 899
 900   return *this;
 901 }
 902
 903 // ---------------------------------------------------------------------------
 904 // finding (return wxNOT_FOUND if not found and index otherwise)
 905 // ---------------------------------------------------------------------------
 906
 907 // find a character
 908 int wxString::Find(char ch, bool bFromEnd) const
 909 {
 910   const char *psz = bFromEnd ? strrchr(m_pchData, ch) : strchr(m_pchData, ch);
 911
 912   return (psz == NULL) ? wxNOT_FOUND : psz - (const char*) m_pchData;
 913 }
 914
 915 // find a sub-string (like strstr)
 916 int wxString::Find(const char *pszSub) const
 917 {
 918   const char *psz = strstr(m_pchData, pszSub);
 919
 920   return (psz == NULL) ? wxNOT_FOUND : psz - (const char*) m_pchData;
 921 }
 922
 923 // ---------------------------------------------------------------------------
 924 // stream-like operators
 925 // ---------------------------------------------------------------------------
 926 wxString& wxString::operator<<(int i)
 927 {
 928     wxString res;
 929     res.Printf("%d", i);
 930
 931     return (*this) << res;
 932 }
 933
 934 wxString& wxString::operator<<(float f)
 935 {
 936     wxString res;
 937     res.Printf("%f", f);
 938
 939     return (*this) << res;
 940 }
 941
 942 wxString& wxString::operator<<(double d)
 943 {
 944     wxString res;
 945     res.Printf("%g", d);
 946
 947     return (*this) << res;
 948 }
 949
 950 // ---------------------------------------------------------------------------
 951 // formatted output
 952 // ---------------------------------------------------------------------------
 953 int wxString::Printf(const char *pszFormat, ...)
 954 {
 955   va_list argptr;
 956   va_start(argptr, pszFormat);
 957
 958   int iLen = PrintfV(pszFormat, argptr);
 959
 960   va_end(argptr);
 961
 962   return iLen;
 963 }
 964
 965 int wxString::PrintfV(const char* pszFormat, va_list argptr)
 966 {
 967   // static buffer to avoid dynamic memory allocation each time
 968   static char s_szScratch[1024];
 969
 970   // NB: wxVsprintf() may return either less than the buffer size or -1 if there
 971   //     is not enough place depending on implementation
 972   int iLen = wxVsprintf(s_szScratch, WXSIZEOF(s_szScratch), pszFormat, argptr);
 973   char *buffer;
 974   if ( iLen < (int)WXSIZEOF(s_szScratch) ) {
 975     buffer = s_szScratch;
 976   }
 977   else {
 978       int size = WXSIZEOF(s_szScratch) * 2;
 979       buffer = (char *)malloc(size);
 980       while ( buffer != NULL ) {
 981           iLen = wxVsprintf(buffer, WXSIZEOF(s_szScratch), pszFormat, argptr);
 982           if ( iLen < size ) {
 983               // ok, there was enough space
 984               break;
 985           }
 986
 987           // still not enough, double it again
 988           buffer = (char *)realloc(buffer, size *= 2);
 989       }
 990
 991       if ( !buffer ) {
 992           // out of memory
 993           return -1;
 994       }
 995   }
 996
 997   AllocBeforeWrite(iLen);
 998   strcpy(m_pchData, buffer);
 999
1000   if ( buffer != s_szScratch )
1001       free(buffer);
1002
1003   return iLen;
1004 }
1005
1006 // ----------------------------------------------------------------------------
1007 // misc other operations
1008 // ----------------------------------------------------------------------------
1009 bool wxString::Matches(const char *pszMask) const
1010 {
1011   // check char by char
1012   const char *pszTxt;
1013   for ( pszTxt = c_str(); *pszMask != '\0'; pszMask++, pszTxt++ ) {
1014     switch ( *pszMask ) {
1015       case '?':
1016         if ( *pszTxt == '\0' )
1017           return FALSE;
1018
1019         pszTxt++;
1020         pszMask++;
1021         break;
1022
1023       case '*':
1024         {
1025           // ignore special chars immediately following this one
1026           while ( *pszMask == '*' || *pszMask == '?' )
1027             pszMask++;
1028
1029           // if there is nothing more, match
1030           if ( *pszMask == '\0' )
1031             return TRUE;
1032
1033           // are there any other metacharacters in the mask?
1034           size_t uiLenMask;
1035           const char *pEndMask = strpbrk(pszMask, "*?");
1036
1037           if ( pEndMask != NULL ) {
1038             // we have to match the string between two metachars
1039             uiLenMask = pEndMask - pszMask;
1040           }
1041           else {
1042             // we have to match the remainder of the string
1043             uiLenMask = strlen(pszMask);
1044           }
1045
1046           wxString strToMatch(pszMask, uiLenMask);
1047           const char* pMatch = strstr(pszTxt, strToMatch);
1048           if ( pMatch == NULL )
1049             return FALSE;
1050
1051           // -1 to compensate "++" in the loop
1052           pszTxt = pMatch + uiLenMask - 1;
1053           pszMask += uiLenMask - 1;
1054         }
1055         break;
1056
1057       default:
1058         if ( *pszMask != *pszTxt )
1059           return FALSE;
1060         break;
1061     }
1062   }
1063
1064   // match only if nothing left
1065   return *pszTxt == '\0';
1066 }
1067
1068 // Count the number of chars
1069 int wxString::Freq(char ch) const
1070 {
1071     int count = 0;
1072     int len = Len();
1073     for (int i = 0; i < len; i++)
1074     {
1075         if (GetChar(i) == ch)
1076             count ++;
1077     }
1078     return count;
1079 }
1080
1081 // convert to upper case, return the copy of the string
1082 wxString wxString::Upper() const
1083 { wxString s(*this); return s.MakeUpper(); }
1084
1085 // convert to lower case, return the copy of the string
1086 wxString wxString::Lower() const { wxString s(*this); return s.MakeLower(); }
1087
1088 int wxString::sprintf(const char *pszFormat, ...)
1089   {
1090     va_list argptr;
1091     va_start(argptr, pszFormat);
1092     int iLen = PrintfV(pszFormat, argptr);
1093     va_end(argptr);
1094     return iLen;
1095   }
1096
1097 // ---------------------------------------------------------------------------
1098 // standard C++ library string functions
1099 // ---------------------------------------------------------------------------
1100 #ifdef  wxSTD_STRING_COMPATIBILITY
1101
1102 wxString& wxString::insert(size_t nPos, const wxString& str)
1103 {
1104   wxASSERT( str.GetStringData()->IsValid() );
1105   wxASSERT( nPos <= Len() );
1106
1107   if ( !str.IsEmpty() ) {
1108     wxString strTmp;
1109     char *pc = strTmp.GetWriteBuf(Len() + str.Len());
1110     strncpy(pc, c_str(), nPos);
1111     strcpy(pc + nPos, str);
1112     strcpy(pc + nPos + str.Len(), c_str() + nPos);
1113     strTmp.UngetWriteBuf();
1114     *this = strTmp;
1115   }
1116
1117   return *this;
1118 }
1119
1120 size_t wxString::find(const wxString& str, size_t nStart) const
1121 {
1122   wxASSERT( str.GetStringData()->IsValid() );
1123   wxASSERT( nStart <= Len() );
1124
1125   const char *p = strstr(c_str() + nStart, str);
1126
1127   return p == NULL ? npos : p - c_str();
1128 }
1129
1130 // VC++ 1.5 can't cope with the default argument in the header.
1131 #if !defined(__VISUALC__) || defined(__WIN32__)
1132 size_t wxString::find(const char* sz, size_t nStart, size_t n) const
1133 {
1134   return find(wxString(sz, n == npos ? 0 : n), nStart);
1135 }
1136 #endif // VC++ 1.5
1137
1138 // Gives a duplicate symbol (presumably a case-insensitivity problem)
1139 #if !defined(__BORLANDC__)
1140 size_t wxString::find(char ch, size_t nStart) const
1141 {
1142   wxASSERT( nStart <= Len() );
1143
1144   const char *p = strchr(c_str() + nStart, ch);
1145
1146   return p == NULL ? npos : p - c_str();
1147 }
1148 #endif
1149
1150 size_t wxString::rfind(const wxString& str, size_t nStart) const
1151 {
1152   wxASSERT( str.GetStringData()->IsValid() );
1153   wxASSERT( nStart <= Len() );
1154
1155   // # could be quicker than that
1156   const char *p = c_str() + (nStart == npos ? Len() : nStart);
1157   while ( p >= c_str() + str.Len() ) {
1158     if ( strncmp(p - str.Len(), str, str.Len()) == 0 )
1159       return p - str.Len() - c_str();
1160     p--;
1161   }
1162
1163   return npos;
1164 }
1165
1166 // VC++ 1.5 can't cope with the default argument in the header.
1167 #if !defined(__VISUALC__) || defined(__WIN32__)
1168 size_t wxString::rfind(const char* sz, size_t nStart, size_t n) const
1169 {
1170   return rfind(wxString(sz, n == npos ? 0 : n), nStart);
1171 }
1172
1173 size_t wxString::rfind(char ch, size_t nStart) const
1174 {
1175   wxASSERT( nStart <= Len() );
1176
1177   const char *p = strrchr(c_str() + nStart, ch);
1178
1179   return p == NULL ? npos : p - c_str();
1180 }
1181 #endif // VC++ 1.5
1182
1183 wxString wxString::substr(size_t nStart, size_t nLen) const
1184 {
1185   // npos means 'take all'
1186   if ( nLen == npos )
1187     nLen = 0;
1188
1189   wxASSERT( nStart + nLen <= Len() );
1190
1191   return wxString(c_str() + nStart, nLen == npos ? 0 : nLen);
1192 }
1193
1194 wxString& wxString::erase(size_t nStart, size_t nLen)
1195 {
1196   wxString strTmp(c_str(), nStart);
1197   if ( nLen != npos ) {
1198     wxASSERT( nStart + nLen <= Len() );
1199
1200     strTmp.append(c_str() + nStart + nLen);
1201   }
1202
1203   *this = strTmp;
1204   return *this;
1205 }
1206
1207 wxString& wxString::replace(size_t nStart, size_t nLen, const char *sz)
1208 {
1209   wxASSERT( nStart + nLen <= Strlen(sz) );
1210
1211   wxString strTmp;
1212   if ( nStart != 0 )
1213     strTmp.append(c_str(), nStart);
1214   strTmp += sz;
1215   strTmp.append(c_str() + nStart + nLen);
1216
1217   *this = strTmp;
1218   return *this;
1219 }
1220
1221 wxString& wxString::replace(size_t nStart, size_t nLen, size_t nCount, char ch)
1222 {
1223   return replace(nStart, nLen, wxString(ch, nCount));
1224 }
1225
1226 wxString& wxString::replace(size_t nStart, size_t nLen,
1227                             const wxString& str, size_t nStart2, size_t nLen2)
1228 {
1229   return replace(nStart, nLen, str.substr(nStart2, nLen2));
1230 }
1231
1232 wxString& wxString::replace(size_t nStart, size_t nLen,
1233                         const char* sz, size_t nCount)
1234 {
1235   return replace(nStart, nLen, wxString(sz, nCount));
1236 }
1237
1238 #endif  //std::string compatibility
1239
1240 // ============================================================================
1241 // ArrayString
1242 // ============================================================================
1243
1244 // size increment = max(50% of current size, ARRAY_MAXSIZE_INCREMENT)
1245 #define   ARRAY_MAXSIZE_INCREMENT       4096
1246 #ifndef   ARRAY_DEFAULT_INITIAL_SIZE    // also defined in dynarray.h
1247   #define   ARRAY_DEFAULT_INITIAL_SIZE    (16)
1248 #endif
1249
1250 #define   STRING(p)   ((wxString *)(&(p)))
1251
1252 // ctor
1253 wxArrayString::wxArrayString()
1254 {
1255   m_nSize  =
1256   m_nCount = 0;
1257   m_pItems = (char **) NULL;
1258 }
1259
1260 // copy ctor
1261 wxArrayString::wxArrayString(const wxArrayString& src)
1262 {
1263   m_nSize  =
1264   m_nCount = 0;
1265   m_pItems = (char **) NULL;
1266
1267   *this = src;
1268 }
1269
1270 // assignment operator
1271 wxArrayString& wxArrayString::operator=(const wxArrayString& src)
1272 {
1273   if ( m_nSize > 0 )
1274     Clear();
1275
1276   if ( src.m_nCount > ARRAY_DEFAULT_INITIAL_SIZE )
1277     Alloc(src.m_nCount);
1278
1279   // we can't just copy the pointers here because otherwise we would share
1280   // the strings with another array
1281   for ( size_t n = 0; n < src.m_nCount; n++ )
1282     Add(src[n]);
1283
1284   if ( m_nCount != 0 )
1285     memcpy(m_pItems, src.m_pItems, m_nCount*sizeof(char *));
1286
1287   return *this;
1288 }
1289
1290 // grow the array
1291 void wxArrayString::Grow()
1292 {
1293   // only do it if no more place
1294   if( m_nCount == m_nSize ) {
1295     if( m_nSize == 0 ) {
1296       // was empty, alloc some memory
1297       m_nSize = ARRAY_DEFAULT_INITIAL_SIZE;
1298       m_pItems = new char *[m_nSize];
1299     }
1300     else {
1301       // otherwise when it's called for the first time, nIncrement would be 0
1302       // and the array would never be expanded
1303       wxASSERT( ARRAY_DEFAULT_INITIAL_SIZE != 0 );
1304
1305       // add 50% but not too much
1306       size_t nIncrement = m_nSize < ARRAY_DEFAULT_INITIAL_SIZE
1307                           ? ARRAY_DEFAULT_INITIAL_SIZE : m_nSize >> 1;
1308       if ( nIncrement > ARRAY_MAXSIZE_INCREMENT )
1309         nIncrement = ARRAY_MAXSIZE_INCREMENT;
1310       m_nSize += nIncrement;
1311       char **pNew = new char *[m_nSize];
1312
1313       // copy data to new location
1314       memcpy(pNew, m_pItems, m_nCount*sizeof(char *));
1315
1316       // delete old memory (but do not release the strings!)
1317       wxDELETEA(m_pItems);
1318
1319       m_pItems = pNew;
1320     }
1321   }
1322 }
1323
1324 void wxArrayString::Free()
1325 {
1326   for ( size_t n = 0; n < m_nCount; n++ ) {
1327     STRING(m_pItems[n])->GetStringData()->Unlock();
1328   }
1329 }
1330
1331 // deletes all the strings from the list
1332 void wxArrayString::Empty()
1333 {
1334   Free();
1335
1336   m_nCount = 0;
1337 }
1338
1339 // as Empty, but also frees memory
1340 void wxArrayString::Clear()
1341 {
1342   Free();
1343
1344   m_nSize  =
1345   m_nCount = 0;
1346
1347   wxDELETEA(m_pItems);
1348 }
1349
1350 // dtor
1351 wxArrayString::~wxArrayString()
1352 {
1353   Free();
1354
1355   wxDELETEA(m_pItems);
1356 }
1357
1358 // pre-allocates memory (frees the previous data!)
1359 void wxArrayString::Alloc(size_t nSize)
1360 {
1361   wxASSERT( nSize > 0 );
1362
1363   // only if old buffer was not big enough
1364   if ( nSize > m_nSize ) {
1365     Free();
1366     wxDELETEA(m_pItems);
1367     m_pItems = new char *[nSize];
1368     m_nSize  = nSize;
1369   }
1370
1371   m_nCount = 0;
1372 }
1373
1374 // searches the array for an item (forward or backwards)
1375 int wxArrayString::Index(const char *sz, bool bCase, bool bFromEnd) const
1376 {
1377   if ( bFromEnd ) {
1378     if ( m_nCount > 0 ) {
1379       size_t ui = m_nCount;
1380       do {
1381         if ( STRING(m_pItems[--ui])->IsSameAs(sz, bCase) )
1382           return ui;
1383       }
1384       while ( ui != 0 );
1385     }
1386   }
1387   else {
1388     for( size_t ui = 0; ui < m_nCount; ui++ ) {
1389       if( STRING(m_pItems[ui])->IsSameAs(sz, bCase) )
1390         return ui;
1391     }
1392   }
1393
1394   return wxNOT_FOUND;
1395 }
1396
1397 // add item at the end
1398 void wxArrayString::Add(const wxString& str)
1399 {
1400   wxASSERT( str.GetStringData()->IsValid() );
1401
1402   Grow();
1403
1404   // the string data must not be deleted!
1405   str.GetStringData()->Lock();
1406   m_pItems[m_nCount++] = (char *)str.c_str();
1407 }
1408
1409 // add item at the given position
1410 void wxArrayString::Insert(const wxString& str, size_t nIndex)
1411 {
1412   wxASSERT( str.GetStringData()->IsValid() );
1413
1414   wxCHECK_RET( nIndex <= m_nCount, ("bad index in wxArrayString::Insert") );
1415
1416   Grow();
1417
1418   memmove(&m_pItems[nIndex + 1], &m_pItems[nIndex],
1419           (m_nCount - nIndex)*sizeof(char *));
1420
1421   str.GetStringData()->Lock();
1422   m_pItems[nIndex] = (char *)str.c_str();
1423
1424   m_nCount++;
1425 }
1426
1427 // removes item from array (by index)
1428 void wxArrayString::Remove(size_t nIndex)
1429 {
1430   wxCHECK_RET( nIndex <= m_nCount, _("bad index in wxArrayString::Remove") );
1431
1432   // release our lock
1433   Item(nIndex).GetStringData()->Unlock();
1434
1435   memmove(&m_pItems[nIndex], &m_pItems[nIndex + 1],
1436           (m_nCount - nIndex - 1)*sizeof(char *));
1437   m_nCount--;
1438 }
1439
1440 // removes item from array (by value)
1441 void wxArrayString::Remove(const char *sz)
1442 {
1443   int iIndex = Index(sz);
1444
1445   wxCHECK_RET( iIndex != wxNOT_FOUND,
1446                _("removing inexistent element in wxArrayString::Remove") );
1447
1448   Remove(iIndex);
1449 }
1450
1451 // ----------------------------------------------------------------------------
1452 // sorting
1453 // ----------------------------------------------------------------------------
1454
1455 // we can only sort one array at a time with the quick-sort based
1456 // implementation
1457 #if wxUSE_THREADS
1458   #include <wx/thread.h>
1459
1460   // need a critical section to protect access to gs_compareFunction and
1461   // gs_sortAscending variables
1462   static wxCriticalSection gs_critsectStringSort;
1463
1464   // call this before the value of the global sort vars is changed/after
1465   // you're finished with them
1466   #define START_SORT()     gs_critsectStringSort.Enter()
1467   #define END_SORT()       gs_critsectStringSort.Leave()
1468 #else // !threads
1469   #define START_SORT()
1470   #define END_SORT()
1471 #endif // wxUSE_THREADS
1472
1473 // function to use for string comparaison
1474 static wxArrayString::CompareFunction gs_compareFunction = NULL;
1475
1476 // if we don't use the compare function, this flag tells us if we sort the
1477 // array in ascending or descending order
1478 static bool gs_sortAscending = TRUE;
1479
1480 // function which is called by quick sort
1481 static int wxStringCompareFunction(const void *first, const void *second)
1482 {
1483   wxString *strFirst = (wxString *)first;
1484   wxString *strSecond = (wxString *)second;
1485
1486   if ( gs_compareFunction )
1487     return gs_compareFunction(*strFirst, *strSecond);
1488   else {
1489     int result = strcmp(strFirst->c_str(), strSecond->c_str());
1490
1491     return gs_sortAscending ? result : -result;
1492   }
1493 }
1494
1495 // sort array elements using passed comparaison function
1496 void wxArrayString::Sort(CompareFunction compareFunction)
1497 {
1498   START_SORT();
1499
1500   wxASSERT( !gs_compareFunction );  // must have been reset to NULL
1501   gs_compareFunction = compareFunction;
1502
1503   DoSort();
1504
1505   END_SORT();
1506 }
1507
1508 void wxArrayString::Sort(bool reverseOrder)
1509 {
1510   START_SORT();
1511
1512   wxASSERT( !gs_compareFunction );  // must have been reset to NULL
1513   gs_sortAscending = !reverseOrder;
1514
1515   DoSort();
1516
1517   END_SORT();
1518 }
1519
1520 void wxArrayString::DoSort()
1521 {
1522   // just sort the pointers using qsort() - of course it only works because
1523   // wxString() *is* a pointer to its data
1524   qsort(m_pItems, m_nCount, sizeof(char *), wxStringCompareFunction);
1525 }