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 #elif defined(__DECCXX)
 120    // nothing
 121 #else
 122     // change this to some analogue of '#warning' for your compiler
 123     #error "Using sprintf() because no snprintf()-like function defined"
 124 #endif //compiler
 125
 126 #endif // no vsnprintf
 127
 128 // ----------------------------------------------------------------------------
 129 // global functions
 130 // ----------------------------------------------------------------------------
 131
 132 #ifdef  wxSTD_STRING_COMPATIBILITY
 133
 134 // MS Visual C++ version 5.0 provides the new STL headers as well as the old
 135 // iostream ones.
 136 //
 137 // ATTN: you can _not_ use both of these in the same program!
 138
 139 istream& operator>>(istream& is, wxString& WXUNUSED(str))
 140 {
 141 #if 0
 142   int w = is.width(0);
 143   if ( is.ipfx(0) ) {
 144     streambuf *sb = is.rdbuf();
 145     str.erase();
 146     while ( true ) {
 147       int ch = sb->sbumpc ();
 148       if ( ch == EOF ) {
 149         is.setstate(ios::eofbit);
 150         break;
 151       }
 152       else if ( isspace(ch) ) {
 153         sb->sungetc();
 154         break;
 155       }
 156
 157       str += ch;
 158       if ( --w == 1 )
 159         break;
 160     }
 161   }
 162
 163   is.isfx();
 164   if ( str.length() == 0 )
 165     is.setstate(ios::failbit);
 166 #endif
 167   return is;
 168 }
 169
 170 #endif  //std::string compatibility
 171
 172 // ----------------------------------------------------------------------------
 173 // private classes
 174 // ----------------------------------------------------------------------------
 175
 176 // this small class is used to gather statistics for performance tuning
 177 //#define WXSTRING_STATISTICS
 178 #ifdef  WXSTRING_STATISTICS
 179   class Averager
 180   {
 181   public:
 182     Averager(const char *sz) { m_sz = sz; m_nTotal = m_nCount = 0; }
 183    ~Averager()
 184    { printf("wxString: average %s = %f\n", m_sz, ((float)m_nTotal)/m_nCount); }
 185
 186     void Add(size_t n) { m_nTotal += n; m_nCount++; }
 187
 188   private:
 189     size_t m_nCount, m_nTotal;
 190     const char *m_sz;
 191   } g_averageLength("allocation size"),
 192     g_averageSummandLength("summand length"),
 193     g_averageConcatHit("hit probability in concat"),
 194     g_averageInitialLength("initial string length");
 195
 196   #define STATISTICS_ADD(av, val) g_average##av.Add(val)
 197 #else
 198   #define STATISTICS_ADD(av, val)
 199 #endif // WXSTRING_STATISTICS
 200
 201 // ===========================================================================
 202 // wxString class core
 203 // ===========================================================================
 204
 205 // ---------------------------------------------------------------------------
 206 // construction
 207 // ---------------------------------------------------------------------------
 208
 209 // constructs string of <nLength> copies of character <ch>
 210 wxString::wxString(char ch, size_t nLength)
 211 {
 212   Init();
 213
 214   if ( nLength > 0 ) {
 215     AllocBuffer(nLength);
 216
 217     wxASSERT( sizeof(char) == 1 );  // can't use memset if not
 218
 219     memset(m_pchData, ch, nLength);
 220   }
 221 }
 222
 223 // takes nLength elements of psz starting at nPos
 224 void wxString::InitWith(const char *psz, size_t nPos, size_t nLength)
 225 {
 226   Init();
 227
 228   wxASSERT( nPos <= Strlen(psz) );
 229
 230   if ( nLength == wxSTRING_MAXLEN )
 231     nLength = Strlen(psz + nPos);
 232
 233   STATISTICS_ADD(InitialLength, nLength);
 234
 235   if ( nLength > 0 ) {
 236     // trailing '\0' is written in AllocBuffer()
 237     AllocBuffer(nLength);
 238     memcpy(m_pchData, psz + nPos, nLength*sizeof(char));
 239   }
 240 }
 241
 242 // the same as previous constructor, but for compilers using unsigned char
 243 wxString::wxString(const unsigned char* psz, size_t nLength)
 244 {
 245   InitWith((const char *)psz, 0, nLength);
 246 }
 247
 248 #ifdef  wxSTD_STRING_COMPATIBILITY
 249
 250 // poor man's iterators are "void *" pointers
 251 wxString::wxString(const void *pStart, const void *pEnd)
 252 {
 253   InitWith((const char *)pStart, 0,
 254            (const char *)pEnd - (const char *)pStart);
 255 }
 256
 257 #endif  //std::string compatibility
 258
 259 // from wide string
 260 wxString::wxString(const wchar_t *pwz)
 261 {
 262   // first get necessary size
 263
 264   // NB: GNU libc5 wcstombs() is completely broken, don't use it (it doesn't
 265   //     honor the 3rd parameter, thus it will happily crash here).
 266 #if wxUSE_WCSRTOMBS
 267   // don't know if it's really needed (or if we can pass NULL), but better safe
 268   // than quick
 269   mbstate_t mbstate;
 270   size_t nLen = wcsrtombs((char *) NULL, &pwz, 0, &mbstate);
 271 #else  // !GNU libc
 272   size_t nLen = wcstombs((char *) NULL, pwz, 0);
 273 #endif // GNU
 274
 275   // empty?
 276   if ( nLen != 0 ) {
 277     AllocBuffer(nLen);
 278     wcstombs(m_pchData, pwz, nLen);
 279   }
 280   else {
 281     Init();
 282   }
 283 }
 284
 285 // ---------------------------------------------------------------------------
 286 // memory allocation
 287 // ---------------------------------------------------------------------------
 288
 289 // allocates memory needed to store a C string of length nLen
 290 void wxString::AllocBuffer(size_t nLen)
 291 {
 292   wxASSERT( nLen >  0         );    //
 293   wxASSERT( nLen <= INT_MAX-1 );    // max size (enough room for 1 extra)
 294
 295   STATISTICS_ADD(Length, nLen);
 296
 297   // allocate memory:
 298   // 1) one extra character for '\0' termination
 299   // 2) sizeof(wxStringData) for housekeeping info
 300   wxStringData* pData = (wxStringData*)
 301     malloc(sizeof(wxStringData) + (nLen + EXTRA_ALLOC + 1)*sizeof(char));
 302   pData->nRefs        = 1;
 303   pData->nDataLength  = nLen;
 304   pData->nAllocLength = nLen + EXTRA_ALLOC;
 305   m_pchData           = pData->data();  // data starts after wxStringData
 306   m_pchData[nLen]     = '\0';
 307 }
 308
 309 // must be called before changing this string
 310 void wxString::CopyBeforeWrite()
 311 {
 312   wxStringData* pData = GetStringData();
 313
 314   if ( pData->IsShared() ) {
 315     pData->Unlock();                // memory not freed because shared
 316     size_t nLen = pData->nDataLength;
 317     AllocBuffer(nLen);
 318     memcpy(m_pchData, pData->data(), nLen*sizeof(char));
 319   }
 320
 321   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 322 }
 323
 324 // must be called before replacing contents of this string
 325 void wxString::AllocBeforeWrite(size_t nLen)
 326 {
 327   wxASSERT( nLen != 0 );  // doesn't make any sense
 328
 329   // must not share string and must have enough space
 330   wxStringData* pData = GetStringData();
 331   if ( pData->IsShared() || (nLen > pData->nAllocLength) ) {
 332     // can't work with old buffer, get new one
 333     pData->Unlock();
 334     AllocBuffer(nLen);
 335   }
 336   else {
 337     // update the string length
 338     pData->nDataLength = nLen;
 339   }
 340
 341   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 342 }
 343
 344 // allocate enough memory for nLen characters
 345 void wxString::Alloc(size_t nLen)
 346 {
 347   wxStringData *pData = GetStringData();
 348   if ( pData->nAllocLength <= nLen ) {
 349     if ( pData->IsEmpty() ) {
 350       nLen += EXTRA_ALLOC;
 351
 352       wxStringData* pData = (wxStringData*)
 353         malloc(sizeof(wxStringData) + (nLen + 1)*sizeof(char));
 354       pData->nRefs = 1;
 355       pData->nDataLength = 0;
 356       pData->nAllocLength = nLen;
 357       m_pchData = pData->data();  // data starts after wxStringData
 358       m_pchData[0u] = '\0';
 359     }
 360     else if ( pData->IsShared() ) {
 361       pData->Unlock();                // memory not freed because shared
 362       size_t nOldLen = pData->nDataLength;
 363       AllocBuffer(nLen);
 364       memcpy(m_pchData, pData->data(), nOldLen*sizeof(char));
 365     }
 366     else {
 367       nLen += EXTRA_ALLOC;
 368
 369       wxStringData *p = (wxStringData *)
 370         realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(char));
 371
 372       if ( p == NULL ) {
 373         // @@@ what to do on memory error?
 374         return;
 375       }
 376
 377       // it's not important if the pointer changed or not (the check for this
 378       // is not faster than assigning to m_pchData in all cases)
 379       p->nAllocLength = nLen;
 380       m_pchData = p->data();
 381     }
 382   }
 383   //else: we've already got enough
 384 }
 385
 386 // shrink to minimal size (releasing extra memory)
 387 void wxString::Shrink()
 388 {
 389   wxStringData *pData = GetStringData();
 390
 391   // this variable is unused in release build, so avoid the compiler warning by
 392   // just not declaring it
 393 #ifdef __WXDEBUG__
 394   void *p =
 395 #endif
 396   realloc(pData, sizeof(wxStringData) + (pData->nDataLength + 1)*sizeof(char));
 397
 398   wxASSERT( p != NULL );  // can't free memory?
 399   wxASSERT( p == pData ); // we're decrementing the size - block shouldn't move!
 400 }
 401
 402 // get the pointer to writable buffer of (at least) nLen bytes
 403 char *wxString::GetWriteBuf(size_t nLen)
 404 {
 405   AllocBeforeWrite(nLen);
 406
 407   wxASSERT( GetStringData()->nRefs == 1 );
 408   GetStringData()->Validate(FALSE);
 409
 410   return m_pchData;
 411 }
 412
 413 // put string back in a reasonable state after GetWriteBuf
 414 void wxString::UngetWriteBuf()
 415 {
 416   GetStringData()->nDataLength = strlen(m_pchData);
 417   GetStringData()->Validate(TRUE);
 418 }
 419
 420 // ---------------------------------------------------------------------------
 421 // data access
 422 // ---------------------------------------------------------------------------
 423
 424 // all functions are inline in string.h
 425
 426 // ---------------------------------------------------------------------------
 427 // assignment operators
 428 // ---------------------------------------------------------------------------
 429
 430 // helper function: does real copy
 431 void wxString::AssignCopy(size_t nSrcLen, const char *pszSrcData)
 432 {
 433   if ( nSrcLen == 0 ) {
 434     Reinit();
 435   }
 436   else {
 437     AllocBeforeWrite(nSrcLen);
 438     memcpy(m_pchData, pszSrcData, nSrcLen*sizeof(char));
 439     GetStringData()->nDataLength = nSrcLen;
 440     m_pchData[nSrcLen] = '\0';
 441   }
 442 }
 443
 444 // assigns one string to another
 445 wxString& wxString::operator=(const wxString& stringSrc)
 446 {
 447   wxASSERT( stringSrc.GetStringData()->IsValid() );
 448
 449   // don't copy string over itself
 450   if ( m_pchData != stringSrc.m_pchData ) {
 451     if ( stringSrc.GetStringData()->IsEmpty() ) {
 452       Reinit();
 453     }
 454     else {
 455       // adjust references
 456       GetStringData()->Unlock();
 457       m_pchData = stringSrc.m_pchData;
 458       GetStringData()->Lock();
 459     }
 460   }
 461
 462   return *this;
 463 }
 464
 465 // assigns a single character
 466 wxString& wxString::operator=(char ch)
 467 {
 468   AssignCopy(1, &ch);
 469   return *this;
 470 }
 471
 472 // assigns C string
 473 wxString& wxString::operator=(const char *psz)
 474 {
 475   AssignCopy(Strlen(psz), psz);
 476   return *this;
 477 }
 478
 479 // same as 'signed char' variant
 480 wxString& wxString::operator=(const unsigned char* psz)
 481 {
 482   *this = (const char *)psz;
 483   return *this;
 484 }
 485
 486 wxString& wxString::operator=(const wchar_t *pwz)
 487 {
 488   wxString str(pwz);
 489   *this = str;
 490   return *this;
 491 }
 492
 493 // ---------------------------------------------------------------------------
 494 // string concatenation
 495 // ---------------------------------------------------------------------------
 496
 497 // add something to this string
 498 void wxString::ConcatSelf(int nSrcLen, const char *pszSrcData)
 499 {
 500   STATISTICS_ADD(SummandLength, nSrcLen);
 501
 502   // concatenating an empty string is a NOP
 503   if ( nSrcLen > 0 ) {
 504     wxStringData *pData = GetStringData();
 505     size_t nLen = pData->nDataLength;
 506     size_t nNewLen = nLen + nSrcLen;
 507
 508     // alloc new buffer if current is too small
 509     if ( pData->IsShared() ) {
 510       STATISTICS_ADD(ConcatHit, 0);
 511
 512       // we have to allocate another buffer
 513       wxStringData* pOldData = GetStringData();
 514       AllocBuffer(nNewLen);
 515       memcpy(m_pchData, pOldData->data(), nLen*sizeof(char));
 516       pOldData->Unlock();
 517     }
 518     else if ( nNewLen > pData->nAllocLength ) {
 519       STATISTICS_ADD(ConcatHit, 0);
 520
 521       // we have to grow the buffer
 522       Alloc(nNewLen);
 523     }
 524     else {
 525       STATISTICS_ADD(ConcatHit, 1);
 526
 527       // the buffer is already big enough
 528     }
 529
 530     // should be enough space
 531     wxASSERT( nNewLen <= GetStringData()->nAllocLength );
 532
 533     // fast concatenation - all is done in our buffer
 534     memcpy(m_pchData + nLen, pszSrcData, nSrcLen*sizeof(char));
 535
 536     m_pchData[nNewLen] = '\0';              // put terminating '\0'
 537     GetStringData()->nDataLength = nNewLen; // and fix the length
 538   }
 539   //else: the string to append was empty
 540 }
 541
 542 /*
 543  * concatenation functions come in 5 flavours:
 544  *  string + string
 545  *  char   + string      and      string + char
 546  *  C str  + string      and      string + C str
 547  */
 548
 549 wxString operator+(const wxString& string1, const wxString& string2)
 550 {
 551   wxASSERT( string1.GetStringData()->IsValid() );
 552   wxASSERT( string2.GetStringData()->IsValid() );
 553
 554   wxString s = string1;
 555   s += string2;
 556
 557   return s;
 558 }
 559
 560 wxString operator+(const wxString& string, char ch)
 561 {
 562   wxASSERT( string.GetStringData()->IsValid() );
 563
 564   wxString s = string;
 565   s += ch;
 566
 567   return s;
 568 }
 569
 570 wxString operator+(char ch, const wxString& string)
 571 {
 572   wxASSERT( string.GetStringData()->IsValid() );
 573
 574   wxString s = ch;
 575   s += string;
 576
 577   return s;
 578 }
 579
 580 wxString operator+(const wxString& string, const char *psz)
 581 {
 582   wxASSERT( string.GetStringData()->IsValid() );
 583
 584   wxString s;
 585   s.Alloc(Strlen(psz) + string.Len());
 586   s = string;
 587   s += psz;
 588
 589   return s;
 590 }
 591
 592 wxString operator+(const char *psz, const wxString& string)
 593 {
 594   wxASSERT( string.GetStringData()->IsValid() );
 595
 596   wxString s;
 597   s.Alloc(Strlen(psz) + string.Len());
 598   s = psz;
 599   s += string;
 600
 601   return s;
 602 }
 603
 604 // ===========================================================================
 605 // other common string functions
 606 // ===========================================================================
 607
 608 // ---------------------------------------------------------------------------
 609 // simple sub-string extraction
 610 // ---------------------------------------------------------------------------
 611
 612 // helper function: clone the data attached to this string
 613 void wxString::AllocCopy(wxString& dest, int nCopyLen, int nCopyIndex) const
 614 {
 615   if ( nCopyLen == 0 ) {
 616     dest.Init();
 617   }
 618   else {
 619     dest.AllocBuffer(nCopyLen);
 620     memcpy(dest.m_pchData, m_pchData + nCopyIndex, nCopyLen*sizeof(char));
 621   }
 622 }
 623
 624 // extract string of length nCount starting at nFirst
 625 wxString wxString::Mid(size_t nFirst, size_t nCount) const
 626 {
 627   wxStringData *pData = GetStringData();
 628   size_t nLen = pData->nDataLength;
 629
 630   // default value of nCount is wxSTRING_MAXLEN and means "till the end"
 631   if ( nCount == wxSTRING_MAXLEN )
 632   {
 633     nCount = nLen - nFirst;
 634   }
 635
 636   // out-of-bounds requests return sensible things
 637   if ( nFirst + nCount > nLen )
 638   {
 639     nCount = nLen - nFirst;
 640   }
 641
 642   if ( nFirst > nLen )
 643   {
 644     // AllocCopy() will return empty string
 645     nCount = 0;
 646   }
 647
 648   wxString dest;
 649   AllocCopy(dest, nCount, nFirst);
 650
 651   return dest;
 652 }
 653
 654 // extract nCount last (rightmost) characters
 655 wxString wxString::Right(size_t nCount) const
 656 {
 657   if ( nCount > (size_t)GetStringData()->nDataLength )
 658     nCount = GetStringData()->nDataLength;
 659
 660   wxString dest;
 661   AllocCopy(dest, nCount, GetStringData()->nDataLength - nCount);
 662   return dest;
 663 }
 664
 665 // get all characters after the last occurence of ch
 666 // (returns the whole string if ch not found)
 667 wxString wxString::AfterLast(char ch) const
 668 {
 669   wxString str;
 670   int iPos = Find(ch, TRUE);
 671   if ( iPos == wxNOT_FOUND )
 672     str = *this;
 673   else
 674     str = c_str() + iPos + 1;
 675
 676   return str;
 677 }
 678
 679 // extract nCount first (leftmost) characters
 680 wxString wxString::Left(size_t nCount) const
 681 {
 682   if ( nCount > (size_t)GetStringData()->nDataLength )
 683     nCount = GetStringData()->nDataLength;
 684
 685   wxString dest;
 686   AllocCopy(dest, nCount, 0);
 687   return dest;
 688 }
 689
 690 // get all characters before the first occurence of ch
 691 // (returns the whole string if ch not found)
 692 wxString wxString::BeforeFirst(char ch) const
 693 {
 694   wxString str;
 695   for ( const char *pc = m_pchData; *pc != '\0' && *pc != ch; pc++ )
 696     str += *pc;
 697
 698   return str;
 699 }
 700
 701 /// get all characters before the last occurence of ch
 702 /// (returns empty string if ch not found)
 703 wxString wxString::BeforeLast(char ch) const
 704 {
 705   wxString str;
 706   int iPos = Find(ch, TRUE);
 707   if ( iPos != wxNOT_FOUND && iPos != 0 )
 708     str = wxString(c_str(), iPos);
 709
 710   return str;
 711 }
 712
 713 /// get all characters after the first occurence of ch
 714 /// (returns empty string if ch not found)
 715 wxString wxString::AfterFirst(char ch) const
 716 {
 717   wxString str;
 718   int iPos = Find(ch);
 719   if ( iPos != wxNOT_FOUND )
 720     str = c_str() + iPos + 1;
 721
 722   return str;
 723 }
 724
 725 // replace first (or all) occurences of some substring with another one
 726 size_t wxString::Replace(const char *szOld, const char *szNew, bool bReplaceAll)
 727 {
 728   size_t uiCount = 0;   // count of replacements made
 729
 730   size_t uiOldLen = Strlen(szOld);
 731
 732   wxString strTemp;
 733   const char *pCurrent = m_pchData;
 734   const char *pSubstr;
 735   while ( *pCurrent != '\0' ) {
 736     pSubstr = strstr(pCurrent, szOld);
 737     if ( pSubstr == NULL ) {
 738       // strTemp is unused if no replacements were made, so avoid the copy
 739       if ( uiCount == 0 )
 740         return 0;
 741
 742       strTemp += pCurrent;    // copy the rest
 743       break;                  // exit the loop
 744     }
 745     else {
 746       // take chars before match
 747       strTemp.ConcatSelf(pSubstr - pCurrent, pCurrent);
 748       strTemp += szNew;
 749       pCurrent = pSubstr + uiOldLen;  // restart after match
 750
 751       uiCount++;
 752
 753       // stop now?
 754       if ( !bReplaceAll ) {
 755         strTemp += pCurrent;    // copy the rest
 756         break;                  // exit the loop
 757       }
 758     }
 759   }
 760
 761   // only done if there were replacements, otherwise would have returned above
 762   *this = strTemp;
 763
 764   return uiCount;
 765 }
 766
 767 bool wxString::IsAscii() const
 768 {
 769   const char *s = (const char*) *this;
 770   while(*s){
 771     if(!isascii(*s)) return(FALSE);
 772     s++;
 773   }
 774   return(TRUE);
 775 }
 776
 777 bool wxString::IsWord() const
 778 {
 779   const char *s = (const char*) *this;
 780   while(*s){
 781     if(!isalpha(*s)) return(FALSE);
 782     s++;
 783   }
 784   return(TRUE);
 785 }
 786
 787 bool wxString::IsNumber() const
 788 {
 789   const char *s = (const char*) *this;
 790   while(*s){
 791     if(!isdigit(*s)) return(FALSE);
 792     s++;
 793   }
 794   return(TRUE);
 795 }
 796
 797 wxString wxString::Strip(stripType w) const
 798 {
 799     wxString s = *this;
 800     if ( w & leading ) s.Trim(FALSE);
 801     if ( w & trailing ) s.Trim(TRUE);
 802     return s;
 803 }
 804
 805 // ---------------------------------------------------------------------------
 806 // case conversion
 807 // ---------------------------------------------------------------------------
 808
 809 wxString& wxString::MakeUpper()
 810 {
 811   CopyBeforeWrite();
 812
 813   for ( char *p = m_pchData; *p; p++ )
 814     *p = (char)toupper(*p);
 815
 816   return *this;
 817 }
 818
 819 wxString& wxString::MakeLower()
 820 {
 821   CopyBeforeWrite();
 822
 823   for ( char *p = m_pchData; *p; p++ )
 824     *p = (char)tolower(*p);
 825
 826   return *this;
 827 }
 828
 829 // ---------------------------------------------------------------------------
 830 // trimming and padding
 831 // ---------------------------------------------------------------------------
 832
 833 // trims spaces (in the sense of isspace) from left or right side
 834 wxString& wxString::Trim(bool bFromRight)
 835 {
 836   // first check if we're going to modify the string at all
 837   if ( !IsEmpty() &&
 838        (
 839         (bFromRight && isspace(GetChar(Len() - 1))) ||
 840         (!bFromRight && isspace(GetChar(0u)))
 841        )
 842      )
 843   {
 844     // ok, there is at least one space to trim
 845     CopyBeforeWrite();
 846
 847     if ( bFromRight )
 848     {
 849       // find last non-space character
 850       char *psz = m_pchData + GetStringData()->nDataLength - 1;
 851       while ( isspace(*psz) && (psz >= m_pchData) )
 852         psz--;
 853
 854       // truncate at trailing space start
 855       *++psz = '\0';
 856       GetStringData()->nDataLength = psz - m_pchData;
 857     }
 858     else
 859     {
 860       // find first non-space character
 861       const char *psz = m_pchData;
 862       while ( isspace(*psz) )
 863         psz++;
 864
 865       // fix up data and length
 866       int nDataLength = GetStringData()->nDataLength - (psz - (const char*) m_pchData);
 867       memmove(m_pchData, psz, (nDataLength + 1)*sizeof(char));
 868       GetStringData()->nDataLength = nDataLength;
 869     }
 870   }
 871
 872   return *this;
 873 }
 874
 875 // adds nCount characters chPad to the string from either side
 876 wxString& wxString::Pad(size_t nCount, char chPad, bool bFromRight)
 877 {
 878   wxString s(chPad, nCount);
 879
 880   if ( bFromRight )
 881     *this += s;
 882   else
 883   {
 884     s += *this;
 885     *this = s;
 886   }
 887
 888   return *this;
 889 }
 890
 891 // truncate the string
 892 wxString& wxString::Truncate(size_t uiLen)
 893 {
 894   if ( uiLen < Len() ) {
 895     CopyBeforeWrite();
 896
 897     *(m_pchData + uiLen) = '\0';
 898     GetStringData()->nDataLength = uiLen;
 899   }
 900   //else: nothing to do, string is already short enough
 901
 902   return *this;
 903 }
 904
 905 // ---------------------------------------------------------------------------
 906 // finding (return wxNOT_FOUND if not found and index otherwise)
 907 // ---------------------------------------------------------------------------
 908
 909 // find a character
 910 int wxString::Find(char ch, bool bFromEnd) const
 911 {
 912   const char *psz = bFromEnd ? strrchr(m_pchData, ch) : strchr(m_pchData, ch);
 913
 914   return (psz == NULL) ? wxNOT_FOUND : psz - (const char*) m_pchData;
 915 }
 916
 917 // find a sub-string (like strstr)
 918 int wxString::Find(const char *pszSub) const
 919 {
 920   const char *psz = strstr(m_pchData, pszSub);
 921
 922   return (psz == NULL) ? wxNOT_FOUND : psz - (const char*) m_pchData;
 923 }
 924
 925 // ---------------------------------------------------------------------------
 926 // stream-like operators
 927 // ---------------------------------------------------------------------------
 928 wxString& wxString::operator<<(int i)
 929 {
 930     wxString res;
 931     res.Printf("%d", i);
 932
 933     return (*this) << res;
 934 }
 935
 936 wxString& wxString::operator<<(float f)
 937 {
 938     wxString res;
 939     res.Printf("%f", f);
 940
 941     return (*this) << res;
 942 }
 943
 944 wxString& wxString::operator<<(double d)
 945 {
 946     wxString res;
 947     res.Printf("%g", d);
 948
 949     return (*this) << res;
 950 }
 951
 952 // ---------------------------------------------------------------------------
 953 // formatted output
 954 // ---------------------------------------------------------------------------
 955 int wxString::Printf(const char *pszFormat, ...)
 956 {
 957   va_list argptr;
 958   va_start(argptr, pszFormat);
 959
 960   int iLen = PrintfV(pszFormat, argptr);
 961
 962   va_end(argptr);
 963
 964   return iLen;
 965 }
 966
 967 int wxString::PrintfV(const char* pszFormat, va_list argptr)
 968 {
 969   // static buffer to avoid dynamic memory allocation each time
 970   static char s_szScratch[1024];
 971
 972   // NB: wxVsprintf() may return either less than the buffer size or -1 if there
 973   //     is not enough place depending on implementation
 974   int iLen = wxVsprintf(s_szScratch, WXSIZEOF(s_szScratch), pszFormat, argptr);
 975   char *buffer;
 976   if ( iLen < (int)WXSIZEOF(s_szScratch) ) {
 977     buffer = s_szScratch;
 978   }
 979   else {
 980       int size = WXSIZEOF(s_szScratch) * 2;
 981       buffer = (char *)malloc(size);
 982       while ( buffer != NULL ) {
 983           iLen = wxVsprintf(buffer, WXSIZEOF(s_szScratch), pszFormat, argptr);
 984           if ( iLen < size ) {
 985               // ok, there was enough space
 986               break;
 987           }
 988
 989           // still not enough, double it again
 990           buffer = (char *)realloc(buffer, size *= 2);
 991       }
 992
 993       if ( !buffer ) {
 994           // out of memory
 995           return -1;
 996       }
 997   }
 998
 999   AllocBeforeWrite(iLen);
1000   strcpy(m_pchData, buffer);
1001
1002   if ( buffer != s_szScratch )
1003       free(buffer);
1004
1005   return iLen;
1006 }
1007
1008 // ----------------------------------------------------------------------------
1009 // misc other operations
1010 // ----------------------------------------------------------------------------
1011 bool wxString::Matches(const char *pszMask) const
1012 {
1013   // check char by char
1014   const char *pszTxt;
1015   for ( pszTxt = c_str(); *pszMask != '\0'; pszMask++, pszTxt++ ) {
1016     switch ( *pszMask ) {
1017       case '?':
1018         if ( *pszTxt == '\0' )
1019           return FALSE;
1020
1021         pszTxt++;
1022         pszMask++;
1023         break;
1024
1025       case '*':
1026         {
1027           // ignore special chars immediately following this one
1028           while ( *pszMask == '*' || *pszMask == '?' )
1029             pszMask++;
1030
1031           // if there is nothing more, match
1032           if ( *pszMask == '\0' )
1033             return TRUE;
1034
1035           // are there any other metacharacters in the mask?
1036           size_t uiLenMask;
1037           const char *pEndMask = strpbrk(pszMask, "*?");
1038
1039           if ( pEndMask != NULL ) {
1040             // we have to match the string between two metachars
1041             uiLenMask = pEndMask - pszMask;
1042           }
1043           else {
1044             // we have to match the remainder of the string
1045             uiLenMask = strlen(pszMask);
1046           }
1047
1048           wxString strToMatch(pszMask, uiLenMask);
1049           const char* pMatch = strstr(pszTxt, strToMatch);
1050           if ( pMatch == NULL )
1051             return FALSE;
1052
1053           // -1 to compensate "++" in the loop
1054           pszTxt = pMatch + uiLenMask - 1;
1055           pszMask += uiLenMask - 1;
1056         }
1057         break;
1058
1059       default:
1060         if ( *pszMask != *pszTxt )
1061           return FALSE;
1062         break;
1063     }
1064   }
1065
1066   // match only if nothing left
1067   return *pszTxt == '\0';
1068 }
1069
1070 // Count the number of chars
1071 int wxString::Freq(char ch) const
1072 {
1073     int count = 0;
1074     int len = Len();
1075     for (int i = 0; i < len; i++)
1076     {
1077         if (GetChar(i) == ch)
1078             count ++;
1079     }
1080     return count;
1081 }
1082
1083 // convert to upper case, return the copy of the string
1084 wxString wxString::Upper() const
1085 { wxString s(*this); return s.MakeUpper(); }
1086
1087 // convert to lower case, return the copy of the string
1088 wxString wxString::Lower() const { wxString s(*this); return s.MakeLower(); }
1089
1090 int wxString::sprintf(const char *pszFormat, ...)
1091   {
1092     va_list argptr;
1093     va_start(argptr, pszFormat);
1094     int iLen = PrintfV(pszFormat, argptr);
1095     va_end(argptr);
1096     return iLen;
1097   }
1098
1099 // ---------------------------------------------------------------------------
1100 // standard C++ library string functions
1101 // ---------------------------------------------------------------------------
1102 #ifdef  wxSTD_STRING_COMPATIBILITY
1103
1104 wxString& wxString::insert(size_t nPos, const wxString& str)
1105 {
1106   wxASSERT( str.GetStringData()->IsValid() );
1107   wxASSERT( nPos <= Len() );
1108
1109   if ( !str.IsEmpty() ) {
1110     wxString strTmp;
1111     char *pc = strTmp.GetWriteBuf(Len() + str.Len());
1112     strncpy(pc, c_str(), nPos);
1113     strcpy(pc + nPos, str);
1114     strcpy(pc + nPos + str.Len(), c_str() + nPos);
1115     strTmp.UngetWriteBuf();
1116     *this = strTmp;
1117   }
1118
1119   return *this;
1120 }
1121
1122 size_t wxString::find(const wxString& str, size_t nStart) const
1123 {
1124   wxASSERT( str.GetStringData()->IsValid() );
1125   wxASSERT( nStart <= Len() );
1126
1127   const char *p = strstr(c_str() + nStart, str);
1128
1129   return p == NULL ? npos : p - c_str();
1130 }
1131
1132 // VC++ 1.5 can't cope with the default argument in the header.
1133 #if !defined(__VISUALC__) || defined(__WIN32__)
1134 size_t wxString::find(const char* sz, size_t nStart, size_t n) const
1135 {
1136   return find(wxString(sz, n == npos ? 0 : n), nStart);
1137 }
1138 #endif // VC++ 1.5
1139
1140 // Gives a duplicate symbol (presumably a case-insensitivity problem)
1141 #if !defined(__BORLANDC__)
1142 size_t wxString::find(char ch, size_t nStart) const
1143 {
1144   wxASSERT( nStart <= Len() );
1145
1146   const char *p = strchr(c_str() + nStart, ch);
1147
1148   return p == NULL ? npos : p - c_str();
1149 }
1150 #endif
1151
1152 size_t wxString::rfind(const wxString& str, size_t nStart) const
1153 {
1154   wxASSERT( str.GetStringData()->IsValid() );
1155   wxASSERT( nStart <= Len() );
1156
1157   // # could be quicker than that
1158   const char *p = c_str() + (nStart == npos ? Len() : nStart);
1159   while ( p >= c_str() + str.Len() ) {
1160     if ( strncmp(p - str.Len(), str, str.Len()) == 0 )
1161       return p - str.Len() - c_str();
1162     p--;
1163   }
1164
1165   return npos;
1166 }
1167
1168 // VC++ 1.5 can't cope with the default argument in the header.
1169 #if !defined(__VISUALC__) || defined(__WIN32__)
1170 size_t wxString::rfind(const char* sz, size_t nStart, size_t n) const
1171 {
1172   return rfind(wxString(sz, n == npos ? 0 : n), nStart);
1173 }
1174
1175 size_t wxString::rfind(char ch, size_t nStart) const
1176 {
1177   wxASSERT( nStart <= Len() );
1178
1179   const char *p = strrchr(c_str() + nStart, ch);
1180
1181   return p == NULL ? npos : p - c_str();
1182 }
1183 #endif // VC++ 1.5
1184
1185 wxString wxString::substr(size_t nStart, size_t nLen) const
1186 {
1187   // npos means 'take all'
1188   if ( nLen == npos )
1189     nLen = 0;
1190
1191   wxASSERT( nStart + nLen <= Len() );
1192
1193   return wxString(c_str() + nStart, nLen == npos ? 0 : nLen);
1194 }
1195
1196 wxString& wxString::erase(size_t nStart, size_t nLen)
1197 {
1198   wxString strTmp(c_str(), nStart);
1199   if ( nLen != npos ) {
1200     wxASSERT( nStart + nLen <= Len() );
1201
1202     strTmp.append(c_str() + nStart + nLen);
1203   }
1204
1205   *this = strTmp;
1206   return *this;
1207 }
1208
1209 wxString& wxString::replace(size_t nStart, size_t nLen, const char *sz)
1210 {
1211   wxASSERT( nStart + nLen <= Strlen(sz) );
1212
1213   wxString strTmp;
1214   if ( nStart != 0 )
1215     strTmp.append(c_str(), nStart);
1216   strTmp += sz;
1217   strTmp.append(c_str() + nStart + nLen);
1218
1219   *this = strTmp;
1220   return *this;
1221 }
1222
1223 wxString& wxString::replace(size_t nStart, size_t nLen, size_t nCount, char ch)
1224 {
1225   return replace(nStart, nLen, wxString(ch, nCount));
1226 }
1227
1228 wxString& wxString::replace(size_t nStart, size_t nLen,
1229                             const wxString& str, size_t nStart2, size_t nLen2)
1230 {
1231   return replace(nStart, nLen, str.substr(nStart2, nLen2));
1232 }
1233
1234 wxString& wxString::replace(size_t nStart, size_t nLen,
1235                         const char* sz, size_t nCount)
1236 {
1237   return replace(nStart, nLen, wxString(sz, nCount));
1238 }
1239
1240 #endif  //std::string compatibility
1241
1242 // ============================================================================
1243 // ArrayString
1244 // ============================================================================
1245
1246 // size increment = max(50% of current size, ARRAY_MAXSIZE_INCREMENT)
1247 #define   ARRAY_MAXSIZE_INCREMENT       4096
1248 #ifndef   ARRAY_DEFAULT_INITIAL_SIZE    // also defined in dynarray.h
1249   #define   ARRAY_DEFAULT_INITIAL_SIZE    (16)
1250 #endif
1251
1252 #define   STRING(p)   ((wxString *)(&(p)))
1253
1254 // ctor
1255 wxArrayString::wxArrayString()
1256 {
1257   m_nSize  =
1258   m_nCount = 0;
1259   m_pItems = (char **) NULL;
1260 }
1261
1262 // copy ctor
1263 wxArrayString::wxArrayString(const wxArrayString& src)
1264 {
1265   m_nSize  =
1266   m_nCount = 0;
1267   m_pItems = (char **) NULL;
1268
1269   *this = src;
1270 }
1271
1272 // assignment operator
1273 wxArrayString& wxArrayString::operator=(const wxArrayString& src)
1274 {
1275   if ( m_nSize > 0 )
1276     Clear();
1277
1278   if ( src.m_nCount > ARRAY_DEFAULT_INITIAL_SIZE )
1279     Alloc(src.m_nCount);
1280
1281   // we can't just copy the pointers here because otherwise we would share
1282   // the strings with another array
1283   for ( size_t n = 0; n < src.m_nCount; n++ )
1284     Add(src[n]);
1285
1286   if ( m_nCount != 0 )
1287     memcpy(m_pItems, src.m_pItems, m_nCount*sizeof(char *));
1288
1289   return *this;
1290 }
1291
1292 // grow the array
1293 void wxArrayString::Grow()
1294 {
1295   // only do it if no more place
1296   if( m_nCount == m_nSize ) {
1297     if( m_nSize == 0 ) {
1298       // was empty, alloc some memory
1299       m_nSize = ARRAY_DEFAULT_INITIAL_SIZE;
1300       m_pItems = new char *[m_nSize];
1301     }
1302     else {
1303       // otherwise when it's called for the first time, nIncrement would be 0
1304       // and the array would never be expanded
1305       wxASSERT( ARRAY_DEFAULT_INITIAL_SIZE != 0 );
1306
1307       // add 50% but not too much
1308       size_t nIncrement = m_nSize < ARRAY_DEFAULT_INITIAL_SIZE
1309                           ? ARRAY_DEFAULT_INITIAL_SIZE : m_nSize >> 1;
1310       if ( nIncrement > ARRAY_MAXSIZE_INCREMENT )
1311         nIncrement = ARRAY_MAXSIZE_INCREMENT;
1312       m_nSize += nIncrement;
1313       char **pNew = new char *[m_nSize];
1314
1315       // copy data to new location
1316       memcpy(pNew, m_pItems, m_nCount*sizeof(char *));
1317
1318       // delete old memory (but do not release the strings!)
1319       wxDELETEA(m_pItems);
1320
1321       m_pItems = pNew;
1322     }
1323   }
1324 }
1325
1326 void wxArrayString::Free()
1327 {
1328   for ( size_t n = 0; n < m_nCount; n++ ) {
1329     STRING(m_pItems[n])->GetStringData()->Unlock();
1330   }
1331 }
1332
1333 // deletes all the strings from the list
1334 void wxArrayString::Empty()
1335 {
1336   Free();
1337
1338   m_nCount = 0;
1339 }
1340
1341 // as Empty, but also frees memory
1342 void wxArrayString::Clear()
1343 {
1344   Free();
1345
1346   m_nSize  =
1347   m_nCount = 0;
1348
1349   wxDELETEA(m_pItems);
1350 }
1351
1352 // dtor
1353 wxArrayString::~wxArrayString()
1354 {
1355   Free();
1356
1357   wxDELETEA(m_pItems);
1358 }
1359
1360 // pre-allocates memory (frees the previous data!)
1361 void wxArrayString::Alloc(size_t nSize)
1362 {
1363   wxASSERT( nSize > 0 );
1364
1365   // only if old buffer was not big enough
1366   if ( nSize > m_nSize ) {
1367     Free();
1368     wxDELETEA(m_pItems);
1369     m_pItems = new char *[nSize];
1370     m_nSize  = nSize;
1371   }
1372
1373   m_nCount = 0;
1374 }
1375
1376 // searches the array for an item (forward or backwards)
1377 int wxArrayString::Index(const char *sz, bool bCase, bool bFromEnd) const
1378 {
1379   if ( bFromEnd ) {
1380     if ( m_nCount > 0 ) {
1381       size_t ui = m_nCount;
1382       do {
1383         if ( STRING(m_pItems[--ui])->IsSameAs(sz, bCase) )
1384           return ui;
1385       }
1386       while ( ui != 0 );
1387     }
1388   }
1389   else {
1390     for( size_t ui = 0; ui < m_nCount; ui++ ) {
1391       if( STRING(m_pItems[ui])->IsSameAs(sz, bCase) )
1392         return ui;
1393     }
1394   }
1395
1396   return wxNOT_FOUND;
1397 }
1398
1399 // add item at the end
1400 void wxArrayString::Add(const wxString& str)
1401 {
1402   wxASSERT( str.GetStringData()->IsValid() );
1403
1404   Grow();
1405
1406   // the string data must not be deleted!
1407   str.GetStringData()->Lock();
1408   m_pItems[m_nCount++] = (char *)str.c_str();
1409 }
1410
1411 // add item at the given position
1412 void wxArrayString::Insert(const wxString& str, size_t nIndex)
1413 {
1414   wxASSERT( str.GetStringData()->IsValid() );
1415
1416   wxCHECK_RET( nIndex <= m_nCount, ("bad index in wxArrayString::Insert") );
1417
1418   Grow();
1419
1420   memmove(&m_pItems[nIndex + 1], &m_pItems[nIndex],
1421           (m_nCount - nIndex)*sizeof(char *));
1422
1423   str.GetStringData()->Lock();
1424   m_pItems[nIndex] = (char *)str.c_str();
1425
1426   m_nCount++;
1427 }
1428
1429 // removes item from array (by index)
1430 void wxArrayString::Remove(size_t nIndex)
1431 {
1432   wxCHECK_RET( nIndex <= m_nCount, _("bad index in wxArrayString::Remove") );
1433
1434   // release our lock
1435   Item(nIndex).GetStringData()->Unlock();
1436
1437   memmove(&m_pItems[nIndex], &m_pItems[nIndex + 1],
1438           (m_nCount - nIndex - 1)*sizeof(char *));
1439   m_nCount--;
1440 }
1441
1442 // removes item from array (by value)
1443 void wxArrayString::Remove(const char *sz)
1444 {
1445   int iIndex = Index(sz);
1446
1447   wxCHECK_RET( iIndex != wxNOT_FOUND,
1448                _("removing inexistent element in wxArrayString::Remove") );
1449
1450   Remove(iIndex);
1451 }
1452
1453 // ----------------------------------------------------------------------------
1454 // sorting
1455 // ----------------------------------------------------------------------------
1456
1457 // we can only sort one array at a time with the quick-sort based
1458 // implementation
1459 #if wxUSE_THREADS
1460   #include <wx/thread.h>
1461
1462   // need a critical section to protect access to gs_compareFunction and
1463   // gs_sortAscending variables
1464   static wxCriticalSection gs_critsectStringSort;
1465
1466   // call this before the value of the global sort vars is changed/after
1467   // you're finished with them
1468   #define START_SORT()     gs_critsectStringSort.Enter()
1469   #define END_SORT()       gs_critsectStringSort.Leave()
1470 #else // !threads
1471   #define START_SORT()
1472   #define END_SORT()
1473 #endif // wxUSE_THREADS
1474
1475 // function to use for string comparaison
1476 static wxArrayString::CompareFunction gs_compareFunction = NULL;
1477
1478 // if we don't use the compare function, this flag tells us if we sort the
1479 // array in ascending or descending order
1480 static bool gs_sortAscending = TRUE;
1481
1482 // function which is called by quick sort
1483 static int wxStringCompareFunction(const void *first, const void *second)
1484 {
1485   wxString *strFirst = (wxString *)first;
1486   wxString *strSecond = (wxString *)second;
1487
1488   if ( gs_compareFunction ) {
1489     return gs_compareFunction(*strFirst, *strSecond);
1490   }
1491   else {
1492     int result = strcmp(strFirst->c_str(), strSecond->c_str());
1493
1494     return gs_sortAscending ? result : -result;
1495   }
1496 }
1497
1498 // sort array elements using passed comparaison function
1499 void wxArrayString::Sort(CompareFunction compareFunction)
1500 {
1501   START_SORT();
1502
1503   wxASSERT( !gs_compareFunction );  // must have been reset to NULL
1504   gs_compareFunction = compareFunction;
1505
1506   DoSort();
1507
1508   END_SORT();
1509 }
1510
1511 void wxArrayString::Sort(bool reverseOrder)
1512 {
1513   START_SORT();
1514
1515   wxASSERT( !gs_compareFunction );  // must have been reset to NULL
1516   gs_sortAscending = !reverseOrder;
1517
1518   DoSort();
1519
1520   END_SORT();
1521 }
1522
1523 void wxArrayString::DoSort()
1524 {
1525   // just sort the pointers using qsort() - of course it only works because
1526   // wxString() *is* a pointer to its data
1527   qsort(m_pItems, m_nCount, sizeof(char *), wxStringCompareFunction);
1528 }