src/common/string.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        string.cpp
   3 // Purpose:     wxString class
   4 // Author:      Vadim Zeitlin, Ryan Norton
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 //              (c) 2004 Ryan Norton <wxprojects@comcast.net>
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 /*
  14  * About ref counting:
  15  *  1) all empty strings use g_strEmpty, nRefs = -1 (set in Init())
  16  *  2) AllocBuffer() sets nRefs to 1, Lock() increments it by one
  17  *  3) Unlock() decrements nRefs and frees memory if it goes to 0
  18  */
  19
  20 // ===========================================================================
  21 // headers, declarations, constants
  22 // ===========================================================================
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28   #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32   #include "wx/defs.h"
  33   #include "wx/string.h"
  34   #include "wx/intl.h"
  35   #include "wx/thread.h"
  36 #endif
  37
  38 #include <ctype.h>
  39 #include <string.h>
  40 #include <stdlib.h>
  41
  42 #ifndef __WXMSW__
  43 #include <errno.h>
  44 #endif
  45
  46 #ifdef __SALFORDC__
  47   #include <clib.h>
  48 #endif
  49
  50 // allocating extra space for each string consumes more memory but speeds up
  51 // the concatenation operations (nLen is the current string's length)
  52 // NB: EXTRA_ALLOC must be >= 0!
  53 #define EXTRA_ALLOC       (19 - nLen % 16)
  54
  55 // ---------------------------------------------------------------------------
  56 // static class variables definition
  57 // ---------------------------------------------------------------------------
  58
  59 #if !wxUSE_STL
  60   //According to STL _must_ be a -1 size_t
  61   const size_t wxStringBase::npos = (size_t) -1;
  62 #endif
  63
  64 // ----------------------------------------------------------------------------
  65 // static data
  66 // ----------------------------------------------------------------------------
  67
  68 #if wxUSE_STL
  69
  70 extern const wxChar WXDLLIMPEXP_BASE *wxEmptyString = _T("");
  71
  72 #else
  73
  74 // for an empty string, GetStringData() will return this address: this
  75 // structure has the same layout as wxStringData and it's data() method will
  76 // return the empty string (dummy pointer)
  77 static const struct
  78 {
  79   wxStringData data;
  80   wxChar dummy;
  81 } g_strEmpty = { {-1, 0, 0}, wxT('\0') };
  82
  83 // empty C style string: points to 'string data' byte of g_strEmpty
  84 extern const wxChar WXDLLIMPEXP_BASE *wxEmptyString = &g_strEmpty.dummy;
  85
  86 #endif
  87
  88 // ----------------------------------------------------------------------------
  89 // global functions
  90 // ----------------------------------------------------------------------------
  91
  92 #if wxUSE_STD_IOSTREAM
  93
  94 // MS Visual C++ version 5.0 provides the new STL headers as well as the old
  95 // iostream ones.
  96 //
  97 // ATTN: you can _not_ use both of these in the same program!
  98
  99 #include <iostream>
 100
 101 wxSTD istream& operator>>(wxSTD istream& is, wxString& WXUNUSED(str))
 102 {
 103 #if 0
 104   int w = is.width(0);
 105   if ( is.ipfx(0) ) {
 106     streambuf *sb = is.rdbuf();
 107     str.erase();
 108     while ( true ) {
 109       int ch = sb->sbumpc ();
 110       if ( ch == EOF ) {
 111         is.setstate(ios::eofbit);
 112         break;
 113       }
 114       else if ( isspace(ch) ) {
 115         sb->sungetc();
 116         break;
 117       }
 118
 119       str += ch;
 120       if ( --w == 1 )
 121         break;
 122     }
 123   }
 124
 125   is.isfx();
 126   if ( str.length() == 0 )
 127     is.setstate(ios::failbit);
 128 #endif
 129   return is;
 130 }
 131
 132 wxSTD ostream& operator<<(wxSTD ostream& os, const wxString& str)
 133 {
 134   os << str.c_str();
 135   return os;
 136 }
 137
 138 #endif // wxUSE_STD_IOSTREAM
 139
 140 // ----------------------------------------------------------------------------
 141 // private classes
 142 // ----------------------------------------------------------------------------
 143
 144 // this small class is used to gather statistics for performance tuning
 145 //#define WXSTRING_STATISTICS
 146 #ifdef  WXSTRING_STATISTICS
 147   class Averager
 148   {
 149   public:
 150     Averager(const wxChar *sz) { m_sz = sz; m_nTotal = m_nCount = 0; }
 151    ~Averager()
 152    { wxPrintf("wxString: average %s = %f\n", m_sz, ((float)m_nTotal)/m_nCount); }
 153
 154     void Add(size_t n) { m_nTotal += n; m_nCount++; }
 155
 156   private:
 157     size_t m_nCount, m_nTotal;
 158     const wxChar *m_sz;
 159   } g_averageLength("allocation size"),
 160     g_averageSummandLength("summand length"),
 161     g_averageConcatHit("hit probability in concat"),
 162     g_averageInitialLength("initial string length");
 163
 164   #define STATISTICS_ADD(av, val) g_average##av.Add(val)
 165 #else
 166   #define STATISTICS_ADD(av, val)
 167 #endif // WXSTRING_STATISTICS
 168
 169 #if !wxUSE_STL
 170
 171 // ===========================================================================
 172 // wxStringData class deallocation
 173 // ===========================================================================
 174
 175 #if defined(__VISUALC__) && defined(_MT) && !defined(_DLL)
 176 #  pragma message (__FILE__ ": building with Multithreaded non DLL runtime has a performance impact on wxString!")
 177 void wxStringData::Free()
 178 {
 179     free(this);
 180 }
 181 #endif
 182
 183 // ===========================================================================
 184 // wxStringBase
 185 // ===========================================================================
 186
 187 // takes nLength elements of psz starting at nPos
 188 void wxStringBase::InitWith(const wxChar *psz, size_t nPos, size_t nLength)
 189 {
 190   Init();
 191
 192   // if the length is not given, assume the string to be NUL terminated
 193   if ( nLength == npos ) {
 194     wxASSERT_MSG( nPos <= wxStrlen(psz), _T("index out of bounds") );
 195
 196     nLength = wxStrlen(psz + nPos);
 197   }
 198
 199   STATISTICS_ADD(InitialLength, nLength);
 200
 201   if ( nLength > 0 ) {
 202     // trailing '\0' is written in AllocBuffer()
 203     if ( !AllocBuffer(nLength) ) {
 204       wxFAIL_MSG( _T("out of memory in wxStringBase::InitWith") );
 205       return;
 206     }
 207     wxTmemcpy(m_pchData, psz + nPos, nLength);
 208   }
 209 }
 210
 211 // poor man's iterators are "void *" pointers
 212 wxStringBase::wxStringBase(const void *pStart, const void *pEnd)
 213 {
 214   InitWith((const wxChar *)pStart, 0,
 215            (const wxChar *)pEnd - (const wxChar *)pStart);
 216 }
 217
 218 wxStringBase::wxStringBase(size_type n, wxChar ch)
 219 {
 220   Init();
 221   append(n, ch);
 222 }
 223
 224 // ---------------------------------------------------------------------------
 225 // memory allocation
 226 // ---------------------------------------------------------------------------
 227
 228 // allocates memory needed to store a C string of length nLen
 229 bool wxStringBase::AllocBuffer(size_t nLen)
 230 {
 231   // allocating 0 sized buffer doesn't make sense, all empty strings should
 232   // reuse g_strEmpty
 233   wxASSERT( nLen >  0 );
 234
 235   // make sure that we don't overflow
 236   wxASSERT( nLen < (INT_MAX / sizeof(wxChar)) -
 237                    (sizeof(wxStringData) + EXTRA_ALLOC + 1) );
 238
 239   STATISTICS_ADD(Length, nLen);
 240
 241   // allocate memory:
 242   // 1) one extra character for '\0' termination
 243   // 2) sizeof(wxStringData) for housekeeping info
 244   wxStringData* pData = (wxStringData*)
 245     malloc(sizeof(wxStringData) + (nLen + EXTRA_ALLOC + 1)*sizeof(wxChar));
 246
 247   if ( pData == NULL ) {
 248     // allocation failures are handled by the caller
 249     return false;
 250   }
 251
 252   pData->nRefs        = 1;
 253   pData->nDataLength  = nLen;
 254   pData->nAllocLength = nLen + EXTRA_ALLOC;
 255   m_pchData           = pData->data();  // data starts after wxStringData
 256   m_pchData[nLen]     = wxT('\0');
 257   return true;
 258 }
 259
 260 // must be called before changing this string
 261 bool wxStringBase::CopyBeforeWrite()
 262 {
 263   wxStringData* pData = GetStringData();
 264
 265   if ( pData->IsShared() ) {
 266     pData->Unlock();                // memory not freed because shared
 267     size_t nLen = pData->nDataLength;
 268     if ( !AllocBuffer(nLen) ) {
 269       // allocation failures are handled by the caller
 270       return false;
 271     }
 272     wxTmemcpy(m_pchData, pData->data(), nLen);
 273   }
 274
 275   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 276
 277   return true;
 278 }
 279
 280 // must be called before replacing contents of this string
 281 bool wxStringBase::AllocBeforeWrite(size_t nLen)
 282 {
 283   wxASSERT( nLen != 0 );  // doesn't make any sense
 284
 285   // must not share string and must have enough space
 286   wxStringData* pData = GetStringData();
 287   if ( pData->IsShared() || pData->IsEmpty() ) {
 288     // can't work with old buffer, get new one
 289     pData->Unlock();
 290     if ( !AllocBuffer(nLen) ) {
 291       // allocation failures are handled by the caller
 292       return false;
 293     }
 294   }
 295   else {
 296     if ( nLen > pData->nAllocLength ) {
 297       // realloc the buffer instead of calling malloc() again, this is more
 298       // efficient
 299       STATISTICS_ADD(Length, nLen);
 300
 301       nLen += EXTRA_ALLOC;
 302
 303       pData = (wxStringData*)
 304           realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar));
 305
 306       if ( pData == NULL ) {
 307         // allocation failures are handled by the caller
 308         // keep previous data since reallocation failed
 309         return false;
 310       }
 311
 312       pData->nAllocLength = nLen;
 313       m_pchData = pData->data();
 314     }
 315   }
 316
 317   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 318
 319   // it doesn't really matter what the string length is as it's going to be
 320   // overwritten later but, for extra safety, set it to 0 for now as we may
 321   // have some junk in m_pchData
 322   GetStringData()->nDataLength = 0;
 323
 324   return true;
 325 }
 326
 327 wxStringBase& wxStringBase::append(size_t n, wxChar ch)
 328 {
 329     size_type len = length();
 330
 331     if ( !Alloc(len + n) || !CopyBeforeWrite() ) {
 332       wxFAIL_MSG( _T("out of memory in wxStringBase::append") );
 333     }
 334     GetStringData()->nDataLength = len + n;
 335     m_pchData[len + n] = '\0';
 336     for ( size_t i = 0; i < n; ++i )
 337         m_pchData[len + i] = ch;
 338     return *this;
 339 }
 340
 341 void wxStringBase::resize(size_t nSize, wxChar ch)
 342 {
 343     size_t len = length();
 344
 345     if ( nSize < len )
 346     {
 347         erase(begin() + nSize, end());
 348     }
 349     else if ( nSize > len )
 350     {
 351         append(nSize - len, ch);
 352     }
 353     //else: we have exactly the specified length, nothing to do
 354 }
 355
 356 // allocate enough memory for nLen characters
 357 bool wxStringBase::Alloc(size_t nLen)
 358 {
 359   wxStringData *pData = GetStringData();
 360   if ( pData->nAllocLength <= nLen ) {
 361     if ( pData->IsEmpty() ) {
 362       nLen += EXTRA_ALLOC;
 363
 364       wxStringData* pData = (wxStringData*)
 365           malloc(sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar));
 366
 367       if ( pData == NULL ) {
 368         // allocation failure handled by caller
 369         return false;
 370       }
 371
 372       pData->nRefs = 1;
 373       pData->nDataLength = 0;
 374       pData->nAllocLength = nLen;
 375       m_pchData = pData->data();  // data starts after wxStringData
 376       m_pchData[0u] = wxT('\0');
 377     }
 378     else if ( pData->IsShared() ) {
 379       pData->Unlock();                // memory not freed because shared
 380       size_t nOldLen = pData->nDataLength;
 381       if ( !AllocBuffer(nLen) ) {
 382         // allocation failure handled by caller
 383         return false;
 384       }
 385       // +1 to copy the terminator, too
 386       memcpy(m_pchData, pData->data(), (nOldLen+1)*sizeof(wxChar));
 387       GetStringData()->nDataLength = nOldLen;
 388     }
 389     else {
 390       nLen += EXTRA_ALLOC;
 391
 392       pData = (wxStringData *)
 393         realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar));
 394
 395       if ( pData == NULL ) {
 396         // allocation failure handled by caller
 397         // keep previous data since reallocation failed
 398         return false;
 399       }
 400
 401       // it's not important if the pointer changed or not (the check for this
 402       // is not faster than assigning to m_pchData in all cases)
 403       pData->nAllocLength = nLen;
 404       m_pchData = pData->data();
 405     }
 406   }
 407   //else: we've already got enough
 408   return true;
 409 }
 410
 411 wxStringBase::iterator wxStringBase::begin()
 412 {
 413     if (length() > 0)
 414         CopyBeforeWrite();
 415     return m_pchData;
 416 }
 417
 418 wxStringBase::iterator wxStringBase::end()
 419 {
 420     if (length() > 0)
 421         CopyBeforeWrite();
 422     return m_pchData + length();
 423 }
 424
 425 wxStringBase::iterator wxStringBase::erase(iterator it)
 426 {
 427     size_type idx = it - begin();
 428     erase(idx, 1);
 429     return begin() + idx;
 430 }
 431
 432 wxStringBase& wxStringBase::erase(size_t nStart, size_t nLen)
 433 {
 434   wxASSERT(nStart <= length());
 435   size_t strLen = length() - nStart;
 436   // delete nLen or up to the end of the string characters
 437   nLen = strLen < nLen ? strLen : nLen;
 438   wxString strTmp(c_str(), nStart);
 439   strTmp.append(c_str() + nStart + nLen, length() - nStart - nLen);
 440
 441   swap(strTmp);
 442   return *this;
 443 }
 444
 445 wxStringBase& wxStringBase::insert(size_t nPos, const wxChar *sz, size_t n)
 446 {
 447   wxASSERT( nPos <= length() );
 448
 449   if ( n == npos ) n = wxStrlen(sz);
 450   if ( n == 0 ) return *this;
 451
 452   if ( !Alloc(length() + n) || !CopyBeforeWrite() ) {
 453     wxFAIL_MSG( _T("out of memory in wxStringBase::insert") );
 454   }
 455
 456   memmove(m_pchData + nPos + n, m_pchData + nPos,
 457           (length() - nPos) * sizeof(wxChar));
 458   memcpy(m_pchData + nPos, sz, n * sizeof(wxChar));
 459   GetStringData()->nDataLength = length() + n;
 460   m_pchData[length()] = '\0';
 461
 462   return *this;
 463 }
 464
 465 void wxStringBase::swap(wxStringBase& str)
 466 {
 467     wxChar* tmp = str.m_pchData;
 468     str.m_pchData = m_pchData;
 469     m_pchData = tmp;
 470 }
 471
 472 size_t wxStringBase::find(const wxStringBase& str, size_t nStart) const
 473 {
 474   wxASSERT( str.GetStringData()->IsValid() );
 475   wxASSERT( nStart <= length() );
 476
 477   //anchor
 478   const wxChar* p = (const wxChar*)wxTmemchr(c_str() + nStart,
 479                                             str.c_str()[0],
 480                                             length() - nStart);
 481
 482   if(!p)
 483       return npos;
 484
 485   while(p - c_str() + str.length() <= length() &&
 486         wxTmemcmp(p, str.c_str(), str.length()) )
 487   {
 488       //Previosly passed as the first argument to wxTmemchr,
 489       //but C/C++ standard does not specify evaluation order
 490       //of arguments to functions -
 491       //http://embedded.com/showArticle.jhtml?articleID=9900607
 492       ++p;
 493
 494       //anchor again
 495       p = (const wxChar*)wxTmemchr(p,
 496                                   str.c_str()[0],
 497                                   length() - (p - c_str()));
 498
 499       if(!p)
 500           return npos;
 501   }
 502
 503    return (p - c_str() + str.length() <= length()) ? p - c_str() : npos;
 504 }
 505
 506 size_t wxStringBase::find(const wxChar* sz, size_t nStart, size_t n) const
 507 {
 508   return find(wxStringBase(sz, n), nStart);
 509 }
 510
 511 size_t wxStringBase::find(wxChar ch, size_t nStart) const
 512 {
 513   wxASSERT( nStart <= length() );
 514
 515   const wxChar *p = (const wxChar*)wxTmemchr(c_str() + nStart, ch, length() - nStart);
 516
 517   return p == NULL ? npos : p - c_str();
 518 }
 519
 520 size_t wxStringBase::rfind(const wxStringBase& str, size_t nStart) const
 521 {
 522     wxASSERT( str.GetStringData()->IsValid() );
 523     wxASSERT( nStart == npos || nStart <= length() );
 524
 525     if ( length() >= str.length() )
 526     {
 527         // avoids a corner case later
 528         if ( length() == 0 && str.length() == 0 )
 529             return 0;
 530
 531         // "top" is the point where search starts from
 532         size_t top = length() - str.length();
 533
 534         if ( nStart == npos )
 535             nStart = length() - 1;
 536         if ( nStart < top )
 537             top = nStart;
 538
 539         const wxChar *cursor = c_str() + top;
 540         do
 541         {
 542             if ( wxTmemcmp(cursor, str.c_str(),
 543                         str.length()) == 0 )
 544             {
 545                 return cursor - c_str();
 546             }
 547         } while ( cursor-- > c_str() );
 548     }
 549
 550     return npos;
 551 }
 552
 553 size_t wxStringBase::rfind(const wxChar* sz, size_t nStart, size_t n) const
 554 {
 555     return rfind(wxStringBase(sz, n), nStart);
 556 }
 557
 558 size_t wxStringBase::rfind(wxChar ch, size_t nStart) const
 559 {
 560     if ( nStart == npos )
 561     {
 562         nStart = length();
 563     }
 564     else
 565     {
 566         wxASSERT( nStart <= length() );
 567     }
 568
 569     const wxChar *actual;
 570     for ( actual = c_str() + ( nStart == npos ? length() : nStart + 1 );
 571           actual > c_str(); --actual )
 572     {
 573         if ( *(actual - 1) == ch )
 574             return (actual - 1) - c_str();
 575     }
 576
 577     return npos;
 578 }
 579
 580 size_t wxStringBase::find_first_of(const wxChar* sz, size_t nStart) const
 581 {
 582     wxASSERT(nStart <= length());
 583
 584     size_t len = wxStrlen(sz);
 585
 586     size_t i;
 587     for(i = nStart; i < this->length(); ++i)
 588     {
 589         if (wxTmemchr(sz, *(c_str() + i), len))
 590             break;
 591     }
 592
 593     if(i == this->length())
 594         return npos;
 595     else
 596         return i;
 597 }
 598
 599 size_t wxStringBase::find_first_of(const wxChar* sz, size_t nStart,
 600                                    size_t n) const
 601 {
 602     return find_first_of(wxStringBase(sz, n), nStart);
 603 }
 604
 605 size_t wxStringBase::find_last_of(const wxChar* sz, size_t nStart) const
 606 {
 607     if ( nStart == npos )
 608     {
 609         nStart = length() - 1;
 610     }
 611     else
 612     {
 613         wxASSERT_MSG( nStart <= length(),
 614                         _T("invalid index in find_last_of()") );
 615     }
 616
 617     size_t len = wxStrlen(sz);
 618
 619     for ( const wxChar *p = c_str() + nStart; p >= c_str(); --p )
 620     {
 621         if ( wxTmemchr(sz, *p, len) )
 622             return p - c_str();
 623     }
 624
 625     return npos;
 626 }
 627
 628 size_t wxStringBase::find_last_of(const wxChar* sz, size_t nStart,
 629                                    size_t n) const
 630 {
 631     return find_last_of(wxStringBase(sz, n), nStart);
 632 }
 633
 634 size_t wxStringBase::find_first_not_of(const wxChar* sz, size_t nStart) const
 635 {
 636     if ( nStart == npos )
 637     {
 638         nStart = length();
 639     }
 640     else
 641     {
 642         wxASSERT( nStart <= length() );
 643     }
 644
 645     size_t len = wxStrlen(sz);
 646
 647     size_t i;
 648     for(i = nStart; i < this->length(); ++i)
 649     {
 650         if (!wxTmemchr(sz, *(c_str() + i), len))
 651             break;
 652     }
 653
 654     if(i == this->length())
 655          return npos;
 656      else
 657         return i;
 658 }
 659
 660 size_t wxStringBase::find_first_not_of(const wxChar* sz, size_t nStart,
 661                                        size_t n) const
 662 {
 663     return find_first_not_of(wxStringBase(sz, n), nStart);
 664 }
 665
 666 size_t wxStringBase::find_first_not_of(wxChar ch, size_t nStart) const
 667 {
 668     wxASSERT( nStart <= length() );
 669
 670     for ( const wxChar *p = c_str() + nStart; *p; p++ )
 671     {
 672         if ( *p != ch )
 673             return p - c_str();
 674     }
 675
 676     return npos;
 677 }
 678
 679 size_t wxStringBase::find_last_not_of(const wxChar* sz, size_t nStart) const
 680 {
 681     if ( nStart == npos )
 682     {
 683         nStart = length() - 1;
 684     }
 685     else
 686     {
 687         wxASSERT( nStart <= length() );
 688     }
 689
 690     size_t len = wxStrlen(sz);
 691
 692     for ( const wxChar *p = c_str() + nStart; p >= c_str(); --p )
 693     {
 694         if ( !wxTmemchr(sz, *p,len) )
 695              return p - c_str();
 696     }
 697
 698     return npos;
 699 }
 700
 701 size_t wxStringBase::find_last_not_of(const wxChar* sz, size_t nStart,
 702                                       size_t n) const
 703 {
 704     return find_last_not_of(wxStringBase(sz, n), nStart);
 705 }
 706
 707 size_t wxStringBase::find_last_not_of(wxChar ch, size_t nStart) const
 708 {
 709     if ( nStart == npos )
 710     {
 711         nStart = length() - 1;
 712     }
 713     else
 714     {
 715         wxASSERT( nStart <= length() );
 716     }
 717
 718     for ( const wxChar *p = c_str() + nStart; p >= c_str(); --p )
 719     {
 720         if ( *p != ch )
 721             return p - c_str();
 722     }
 723
 724     return npos;
 725 }
 726
 727 wxStringBase& wxStringBase::replace(size_t nStart, size_t nLen,
 728                                     const wxChar *sz)
 729 {
 730   wxASSERT_MSG( nStart <= length(),
 731                 _T("index out of bounds in wxStringBase::replace") );
 732   size_t strLen = length() - nStart;
 733   nLen = strLen < nLen ? strLen : nLen;
 734
 735   wxStringBase strTmp;
 736   strTmp.reserve(length()); // micro optimisation to avoid multiple mem allocs
 737
 738   if ( nStart != 0 )
 739     strTmp.append(c_str(), nStart);
 740   strTmp.append(sz);
 741   strTmp.append(c_str() + nStart + nLen);
 742
 743   swap(strTmp);
 744   return *this;
 745 }
 746
 747 wxStringBase& wxStringBase::replace(size_t nStart, size_t nLen,
 748                                     size_t nCount, wxChar ch)
 749 {
 750   return replace(nStart, nLen, wxStringBase(nCount, ch).c_str());
 751 }
 752
 753 wxStringBase& wxStringBase::replace(size_t nStart, size_t nLen,
 754                                     const wxStringBase& str,
 755                                     size_t nStart2, size_t nLen2)
 756 {
 757   return replace(nStart, nLen, str.substr(nStart2, nLen2));
 758 }
 759
 760 wxStringBase& wxStringBase::replace(size_t nStart, size_t nLen,
 761                                     const wxChar* sz, size_t nCount)
 762 {
 763   return replace(nStart, nLen, wxStringBase(sz, nCount).c_str());
 764 }
 765
 766 wxStringBase wxStringBase::substr(size_t nStart, size_t nLen) const
 767 {
 768   if ( nLen == npos )
 769     nLen = length() - nStart;
 770   return wxStringBase(*this, nStart, nLen);
 771 }
 772
 773 // assigns one string to another
 774 wxStringBase& wxStringBase::operator=(const wxStringBase& stringSrc)
 775 {
 776   wxASSERT( stringSrc.GetStringData()->IsValid() );
 777
 778   // don't copy string over itself
 779   if ( m_pchData != stringSrc.m_pchData ) {
 780     if ( stringSrc.GetStringData()->IsEmpty() ) {
 781       Reinit();
 782     }
 783     else {
 784       // adjust references
 785       GetStringData()->Unlock();
 786       m_pchData = stringSrc.m_pchData;
 787       GetStringData()->Lock();
 788     }
 789   }
 790
 791   return *this;
 792 }
 793
 794 // assigns a single character
 795 wxStringBase& wxStringBase::operator=(wxChar ch)
 796 {
 797   if ( !AssignCopy(1, &ch) ) {
 798     wxFAIL_MSG( _T("out of memory in wxStringBase::operator=(wxChar)") );
 799   }
 800   return *this;
 801 }
 802
 803 // assigns C string
 804 wxStringBase& wxStringBase::operator=(const wxChar *psz)
 805 {
 806   if ( !AssignCopy(wxStrlen(psz), psz) ) {
 807     wxFAIL_MSG( _T("out of memory in wxStringBase::operator=(const wxChar *)") );
 808   }
 809   return *this;
 810 }
 811
 812 // helper function: does real copy
 813 bool wxStringBase::AssignCopy(size_t nSrcLen, const wxChar *pszSrcData)
 814 {
 815   if ( nSrcLen == 0 ) {
 816     Reinit();
 817   }
 818   else {
 819     if ( !AllocBeforeWrite(nSrcLen) ) {
 820       // allocation failure handled by caller
 821       return false;
 822     }
 823     memcpy(m_pchData, pszSrcData, nSrcLen*sizeof(wxChar));
 824     GetStringData()->nDataLength = nSrcLen;
 825     m_pchData[nSrcLen] = wxT('\0');
 826   }
 827   return true;
 828 }
 829
 830 // ---------------------------------------------------------------------------
 831 // string concatenation
 832 // ---------------------------------------------------------------------------
 833
 834 // add something to this string
 835 bool wxStringBase::ConcatSelf(size_t nSrcLen, const wxChar *pszSrcData,
 836                               size_t nMaxLen)
 837 {
 838   STATISTICS_ADD(SummandLength, nSrcLen);
 839
 840   nSrcLen = nSrcLen < nMaxLen ? nSrcLen : nMaxLen;
 841
 842   // concatenating an empty string is a NOP
 843   if ( nSrcLen > 0 ) {
 844     wxStringData *pData = GetStringData();
 845     size_t nLen = pData->nDataLength;
 846     size_t nNewLen = nLen + nSrcLen;
 847
 848     // alloc new buffer if current is too small
 849     if ( pData->IsShared() ) {
 850       STATISTICS_ADD(ConcatHit, 0);
 851
 852       // we have to allocate another buffer
 853       wxStringData* pOldData = GetStringData();
 854       if ( !AllocBuffer(nNewLen) ) {
 855           // allocation failure handled by caller
 856           return false;
 857       }
 858       memcpy(m_pchData, pOldData->data(), nLen*sizeof(wxChar));
 859       pOldData->Unlock();
 860     }
 861     else if ( nNewLen > pData->nAllocLength ) {
 862       STATISTICS_ADD(ConcatHit, 0);
 863
 864       reserve(nNewLen);
 865       // we have to grow the buffer
 866       if ( capacity() < nNewLen ) {
 867           // allocation failure handled by caller
 868           return false;
 869       }
 870     }
 871     else {
 872       STATISTICS_ADD(ConcatHit, 1);
 873
 874       // the buffer is already big enough
 875     }
 876
 877     // should be enough space
 878     wxASSERT( nNewLen <= GetStringData()->nAllocLength );
 879
 880     // fast concatenation - all is done in our buffer
 881     memcpy(m_pchData + nLen, pszSrcData, nSrcLen*sizeof(wxChar));
 882
 883     m_pchData[nNewLen] = wxT('\0');          // put terminating '\0'
 884     GetStringData()->nDataLength = nNewLen; // and fix the length
 885   }
 886   //else: the string to append was empty
 887   return true;
 888 }
 889
 890 // ---------------------------------------------------------------------------
 891 // simple sub-string extraction
 892 // ---------------------------------------------------------------------------
 893
 894 // helper function: clone the data attached to this string
 895 bool wxStringBase::AllocCopy(wxString& dest, int nCopyLen, int nCopyIndex) const
 896 {
 897   if ( nCopyLen == 0 ) {
 898     dest.Init();
 899   }
 900   else {
 901     if ( !dest.AllocBuffer(nCopyLen) ) {
 902       // allocation failure handled by caller
 903       return false;
 904     }
 905     memcpy(dest.m_pchData, m_pchData + nCopyIndex, nCopyLen*sizeof(wxChar));
 906   }
 907   return true;
 908 }
 909
 910 #endif // !wxUSE_STL
 911
 912 #if !wxUSE_STL || !defined(HAVE_STD_STRING_COMPARE)
 913
 914 #if !wxUSE_STL
 915     #define STRINGCLASS wxStringBase
 916 #else
 917     #define STRINGCLASS wxString
 918 #endif
 919
 920 static inline int wxDoCmp(const wxChar* s1, size_t l1,
 921                           const wxChar* s2, size_t l2)
 922 {
 923     if( l1 == l2 )
 924         return wxTmemcmp(s1, s2, l1);
 925     else if( l1 < l2 )
 926     {
 927         int ret = wxTmemcmp(s1, s2, l1);
 928         return ret == 0 ? -1 : ret;
 929     }
 930     else
 931     {
 932         int ret = wxTmemcmp(s1, s2, l2);
 933         return ret == 0 ? +1 : ret;
 934     }
 935 }
 936
 937 int STRINGCLASS::compare(const wxStringBase& str) const
 938 {
 939     return ::wxDoCmp(data(), length(), str.data(), str.length());
 940 }
 941
 942 int STRINGCLASS::compare(size_t nStart, size_t nLen,
 943                          const wxStringBase& str) const
 944 {
 945     wxASSERT(nStart <= length());
 946     size_type strLen = length() - nStart;
 947     nLen = strLen < nLen ? strLen : nLen;
 948     return ::wxDoCmp(data() + nStart, nLen, str.data(), str.length());
 949 }
 950
 951 int STRINGCLASS::compare(size_t nStart, size_t nLen,
 952                          const wxStringBase& str,
 953                          size_t nStart2, size_t nLen2) const
 954 {
 955     wxASSERT(nStart <= length());
 956     wxASSERT(nStart2 <= str.length());
 957     size_type strLen  =     length() - nStart,
 958               strLen2 = str.length() - nStart2;
 959     nLen  = strLen  < nLen  ? strLen  : nLen;
 960     nLen2 = strLen2 < nLen2 ? strLen2 : nLen2;
 961     return ::wxDoCmp(data() + nStart, nLen, str.data() + nStart2, nLen2);
 962 }
 963
 964 int STRINGCLASS::compare(const wxChar* sz) const
 965 {
 966     size_t nLen = wxStrlen(sz);
 967     return ::wxDoCmp(data(), length(), sz, nLen);
 968 }
 969
 970 int STRINGCLASS::compare(size_t nStart, size_t nLen,
 971                          const wxChar* sz, size_t nCount) const
 972 {
 973     wxASSERT(nStart <= length());
 974     size_type strLen = length() - nStart;
 975     nLen = strLen < nLen ? strLen : nLen;
 976     if( nCount == npos )
 977         nCount = wxStrlen(sz);
 978
 979     return ::wxDoCmp(data() + nStart, nLen, sz, nCount);
 980 }
 981
 982 #undef STRINGCLASS
 983
 984 #endif // !wxUSE_STL || !defined(HAVE_STD_STRING_COMPARE)
 985
 986 // ===========================================================================
 987 // wxString class core
 988 // ===========================================================================
 989
 990 // ---------------------------------------------------------------------------
 991 // construction and conversion
 992 // ---------------------------------------------------------------------------
 993
 994 #if wxUSE_UNICODE
 995
 996 // from multibyte string
 997 wxString::wxString(const char *psz, wxMBConv& conv, size_t nLength)
 998 {
 999     // if nLength != npos, then we have to make a NULL-terminated copy
1000     // of first nLength bytes of psz first because the input buffer to MB2WC
1001     // must always be NULL-terminated:
1002     wxCharBuffer inBuf((const char *)NULL);
1003     if (nLength != npos)
1004     {
1005         wxASSERT( psz != NULL );
1006         wxCharBuffer tmp(nLength);
1007         memcpy(tmp.data(), psz, nLength);
1008         tmp.data()[nLength] = '\0';
1009         inBuf = tmp;
1010         psz = inBuf.data();
1011     }
1012
1013     // first get the size of the buffer we need
1014     size_t nLen;
1015     if ( psz )
1016     {
1017         // calculate the needed size ourselves or use the provided one
1018         if (nLength == npos)
1019             nLen = strlen(psz);
1020         else
1021             nLen = nLength;
1022     }
1023     else
1024     {
1025         // nothing to convert
1026         nLen = 0;
1027     }
1028
1029
1030     // anything to do?
1031     if ( (nLen != 0) && (nLen != (size_t)-1) )
1032     {
1033         //Convert string
1034         size_t nRealSize;
1035         wxWCharBuffer theBuffer = conv.cMB2WC(psz, nLen, &nRealSize);
1036
1037         //Copy
1038         if (nRealSize)
1039             assign( theBuffer.data() , nRealSize - 1 );
1040     }
1041 }
1042
1043 //Convert wxString in Unicode mode to a multi-byte string
1044 const wxCharBuffer wxString::mb_str(wxMBConv& conv) const
1045 {
1046     size_t dwOutSize;
1047     return conv.cWC2MB(c_str(), length(), &dwOutSize);
1048 }
1049
1050 #else // ANSI
1051
1052 #if wxUSE_WCHAR_T
1053 // from wide string
1054 wxString::wxString(const wchar_t *pwz, wxMBConv& conv, size_t nLength)
1055 {
1056     // if nLength != npos, then we have to make a NULL-terminated copy
1057     // of first nLength chars of psz first because the input buffer to WC2MB
1058     // must always be NULL-terminated:
1059     wxWCharBuffer inBuf((const wchar_t *)NULL);
1060     if (nLength != npos)
1061     {
1062         wxASSERT( pwz != NULL );
1063         wxWCharBuffer tmp(nLength);
1064         memcpy(tmp.data(), pwz, nLength * sizeof(wchar_t));
1065         tmp.data()[nLength] = '\0';
1066         inBuf = tmp;
1067         pwz = inBuf.data();
1068     }
1069
1070     // first get the size of the buffer we need
1071     size_t nLen;
1072     if ( pwz )
1073     {
1074         // calculate the needed size ourselves or use the provided one
1075         if (nLength == npos)
1076             nLen = wxWcslen(pwz);
1077         else
1078             nLen = nLength;
1079     }
1080     else
1081     {
1082         // nothing to convert
1083         nLen = 0;
1084     }
1085
1086     // anything to do?
1087     if ( (nLen != 0) && (nLen != (size_t)-1) )
1088     {
1089         //Convert string
1090         size_t nRealSize;
1091         wxCharBuffer theBuffer = conv.cWC2MB(pwz, nLen, &nRealSize);
1092
1093         //Copy
1094         if (nRealSize)
1095             assign( theBuffer.data() , nRealSize - 1 );
1096     }
1097 }
1098
1099 //Converts this string to a wide character string if unicode
1100 //mode is not enabled and wxUSE_WCHAR_T is enabled
1101 const wxWCharBuffer wxString::wc_str(wxMBConv& conv) const
1102 {
1103     size_t dwOutSize;
1104     return conv.cMB2WC(c_str(), length(), &dwOutSize);
1105 }
1106
1107 #endif // wxUSE_WCHAR_T
1108
1109 #endif // Unicode/ANSI
1110
1111 // shrink to minimal size (releasing extra memory)
1112 bool wxString::Shrink()
1113 {
1114   wxString tmp(begin(), end());
1115   swap(tmp);
1116   return tmp.length() == length();
1117 }
1118
1119 #if !wxUSE_STL
1120 // get the pointer to writable buffer of (at least) nLen bytes
1121 wxChar *wxString::GetWriteBuf(size_t nLen)
1122 {
1123   if ( !AllocBeforeWrite(nLen) ) {
1124     // allocation failure handled by caller
1125     return NULL;
1126   }
1127
1128   wxASSERT( GetStringData()->nRefs == 1 );
1129   GetStringData()->Validate(false);
1130
1131   return m_pchData;
1132 }
1133
1134 // put string back in a reasonable state after GetWriteBuf
1135 void wxString::UngetWriteBuf()
1136 {
1137   GetStringData()->nDataLength = wxStrlen(m_pchData);
1138   GetStringData()->Validate(true);
1139 }
1140
1141 void wxString::UngetWriteBuf(size_t nLen)
1142 {
1143   GetStringData()->nDataLength = nLen;
1144   GetStringData()->Validate(true);
1145 }
1146 #endif
1147
1148 // ---------------------------------------------------------------------------
1149 // data access
1150 // ---------------------------------------------------------------------------
1151
1152 // all functions are inline in string.h
1153
1154 // ---------------------------------------------------------------------------
1155 // assignment operators
1156 // ---------------------------------------------------------------------------
1157
1158 #if !wxUSE_UNICODE
1159
1160 // same as 'signed char' variant
1161 wxString& wxString::operator=(const unsigned char* psz)
1162 {
1163   *this = (const char *)psz;
1164   return *this;
1165 }
1166
1167 #if wxUSE_WCHAR_T
1168 wxString& wxString::operator=(const wchar_t *pwz)
1169 {
1170   wxString str(pwz);
1171   swap(str);
1172   return *this;
1173 }
1174 #endif
1175
1176 #endif
1177
1178 /*
1179  * concatenation functions come in 5 flavours:
1180  *  string + string
1181  *  char   + string      and      string + char
1182  *  C str  + string      and      string + C str
1183  */
1184
1185 wxString operator+(const wxString& str1, const wxString& str2)
1186 {
1187 #if !wxUSE_STL
1188   wxASSERT( str1.GetStringData()->IsValid() );
1189   wxASSERT( str2.GetStringData()->IsValid() );
1190 #endif
1191
1192   wxString s = str1;
1193   s += str2;
1194
1195   return s;
1196 }
1197
1198 wxString operator+(const wxString& str, wxChar ch)
1199 {
1200 #if !wxUSE_STL
1201   wxASSERT( str.GetStringData()->IsValid() );
1202 #endif
1203
1204   wxString s = str;
1205   s += ch;
1206
1207   return s;
1208 }
1209
1210 wxString operator+(wxChar ch, const wxString& str)
1211 {
1212 #if !wxUSE_STL
1213   wxASSERT( str.GetStringData()->IsValid() );
1214 #endif
1215
1216   wxString s = ch;
1217   s += str;
1218
1219   return s;
1220 }
1221
1222 wxString operator+(const wxString& str, const wxChar *psz)
1223 {
1224 #if !wxUSE_STL
1225   wxASSERT( str.GetStringData()->IsValid() );
1226 #endif
1227
1228   wxString s;
1229   if ( !s.Alloc(wxStrlen(psz) + str.Len()) ) {
1230     wxFAIL_MSG( _T("out of memory in wxString::operator+") );
1231   }
1232   s += str;
1233   s += psz;
1234
1235   return s;
1236 }
1237
1238 wxString operator+(const wxChar *psz, const wxString& str)
1239 {
1240 #if !wxUSE_STL
1241   wxASSERT( str.GetStringData()->IsValid() );
1242 #endif
1243
1244   wxString s;
1245   if ( !s.Alloc(wxStrlen(psz) + str.Len()) ) {
1246     wxFAIL_MSG( _T("out of memory in wxString::operator+") );
1247   }
1248   s = psz;
1249   s += str;
1250
1251   return s;
1252 }
1253
1254 // ===========================================================================
1255 // other common string functions
1256 // ===========================================================================
1257
1258 int wxString::Cmp(const wxString& s) const
1259 {
1260     return compare(s);
1261 }
1262
1263 int wxString::Cmp(const wxChar* psz) const
1264 {
1265     return compare(psz);
1266 }
1267
1268 static inline int wxDoCmpNoCase(const wxChar* s1, size_t l1,
1269                                 const wxChar* s2, size_t l2)
1270 {
1271     size_t i;
1272
1273     if( l1 == l2 )
1274     {
1275         for(i = 0; i < l1; ++i)
1276         {
1277             if(wxTolower(s1[i]) != wxTolower(s2[i]))
1278                 break;
1279         }
1280         return i == l1 ? 0 : wxTolower(s1[i]) < wxTolower(s2[i]) ? -1 : 1;
1281     }
1282     else if( l1 < l2 )
1283     {
1284         for(i = 0; i < l1; ++i)
1285         {
1286             if(wxTolower(s1[i]) != wxTolower(s2[i]))
1287                 break;
1288         }
1289         return i == l1 ? -1 : wxTolower(s1[i]) < wxTolower(s2[i]) ? -1 : 1;
1290     }
1291     else
1292     {
1293         for(i = 0; i < l2; ++i)
1294         {
1295             if(wxTolower(s1[i]) != wxTolower(s2[i]))
1296                 break;
1297         }
1298         return i == l2 ? 1 : wxTolower(s1[i]) < wxTolower(s2[i]) ? -1 : 1;
1299     }
1300 }
1301
1302 int wxString::CmpNoCase(const wxString& s) const
1303 {
1304     return wxDoCmpNoCase(data(), length(), s.data(), s.length());
1305 }
1306
1307 int wxString::CmpNoCase(const wxChar* psz) const
1308 {
1309     int nLen = wxStrlen(psz);
1310
1311     return wxDoCmpNoCase(data(), length(), psz, nLen);
1312 }
1313
1314
1315 #if wxUSE_UNICODE
1316
1317 #ifdef __MWERKS__
1318 #ifndef __SCHAR_MAX__
1319 #define __SCHAR_MAX__ 127
1320 #endif
1321 #endif
1322
1323 wxString wxString::FromAscii(const char *ascii)
1324 {
1325     if (!ascii)
1326        return wxEmptyString;
1327
1328     size_t len = strlen( ascii );
1329     wxString res;
1330
1331     if ( len )
1332     {
1333         wxStringBuffer buf(res, len);
1334
1335         wchar_t *dest = buf;
1336
1337         for ( ;; )
1338         {
1339            if ( (*dest++ = (wchar_t)(unsigned char)*ascii++) == L'\0' )
1340                break;
1341         }
1342     }
1343
1344     return res;
1345 }
1346
1347 wxString wxString::FromAscii(const char ascii)
1348 {
1349     // What do we do with '\0' ?
1350
1351     wxString res;
1352     res += (wchar_t)(unsigned char) ascii;
1353
1354     return res;
1355 }
1356
1357 const wxCharBuffer wxString::ToAscii() const
1358 {
1359     // this will allocate enough space for the terminating NUL too
1360     wxCharBuffer buffer(length());
1361
1362
1363     char *dest = buffer.data();
1364
1365     const wchar_t *pwc = c_str();
1366     for ( ;; )
1367     {
1368         *dest++ = (char)(*pwc > SCHAR_MAX ? wxT('_') : *pwc);
1369
1370         // the output string can't have embedded NULs anyhow, so we can safely
1371         // stop at first of them even if we do have any
1372         if ( !*pwc++ )
1373             break;
1374     }
1375
1376     return buffer;
1377 }
1378
1379 #endif // Unicode
1380
1381 // extract string of length nCount starting at nFirst
1382 wxString wxString::Mid(size_t nFirst, size_t nCount) const
1383 {
1384   size_t nLen = length();
1385
1386   // default value of nCount is npos and means "till the end"
1387   if ( nCount == npos )
1388   {
1389     nCount = nLen - nFirst;
1390   }
1391
1392   // out-of-bounds requests return sensible things
1393   if ( nFirst + nCount > nLen )
1394   {
1395     nCount = nLen - nFirst;
1396   }
1397
1398   if ( nFirst > nLen )
1399   {
1400     // AllocCopy() will return empty string
1401     nCount = 0;
1402   }
1403
1404   wxString dest(*this, nFirst, nCount);
1405   if ( dest.length() != nCount ) {
1406       wxFAIL_MSG( _T("out of memory in wxString::Mid") );
1407   }
1408
1409   return dest;
1410 }
1411
1412 // check that the string starts with prefix and return the rest of the string
1413 // in the provided pointer if it is not NULL, otherwise return false
1414 bool wxString::StartsWith(const wxChar *prefix, wxString *rest) const
1415 {
1416     wxASSERT_MSG( prefix, _T("invalid parameter in wxString::StartsWith") );
1417
1418     // first check if the beginning of the string matches the prefix: note
1419     // that we don't have to check that we don't run out of this string as
1420     // when we reach the terminating NUL, either prefix string ends too (and
1421     // then it's ok) or we break out of the loop because there is no match
1422     const wxChar *p = c_str();
1423     while ( *prefix )
1424     {
1425         if ( *prefix++ != *p++ )
1426         {
1427             // no match
1428             return false;
1429         }
1430     }
1431
1432     if ( rest )
1433     {
1434         // put the rest of the string into provided pointer
1435         *rest = p;
1436     }
1437
1438     return true;
1439 }
1440
1441 // extract nCount last (rightmost) characters
1442 wxString wxString::Right(size_t nCount) const
1443 {
1444   if ( nCount > length() )
1445     nCount = length();
1446
1447   wxString dest(*this, length() - nCount, nCount);
1448   if ( dest.length() != nCount ) {
1449     wxFAIL_MSG( _T("out of memory in wxString::Right") );
1450   }
1451   return dest;
1452 }
1453
1454 // get all characters after the last occurence of ch
1455 // (returns the whole string if ch not found)
1456 wxString wxString::AfterLast(wxChar ch) const
1457 {
1458   wxString str;
1459   int iPos = Find(ch, true);
1460   if ( iPos == wxNOT_FOUND )
1461     str = *this;
1462   else
1463     str = c_str() + iPos + 1;
1464
1465   return str;
1466 }
1467
1468 // extract nCount first (leftmost) characters
1469 wxString wxString::Left(size_t nCount) const
1470 {
1471   if ( nCount > length() )
1472     nCount = length();
1473
1474   wxString dest(*this, 0, nCount);
1475   if ( dest.length() != nCount ) {
1476     wxFAIL_MSG( _T("out of memory in wxString::Left") );
1477   }
1478   return dest;
1479 }
1480
1481 // get all characters before the first occurence of ch
1482 // (returns the whole string if ch not found)
1483 wxString wxString::BeforeFirst(wxChar ch) const
1484 {
1485   int iPos = Find(ch);
1486   if ( iPos == wxNOT_FOUND ) iPos = length();
1487   return wxString(*this, 0, iPos);
1488 }
1489
1490 /// get all characters before the last occurence of ch
1491 /// (returns empty string if ch not found)
1492 wxString wxString::BeforeLast(wxChar ch) const
1493 {
1494   wxString str;
1495   int iPos = Find(ch, true);
1496   if ( iPos != wxNOT_FOUND && iPos != 0 )
1497     str = wxString(c_str(), iPos);
1498
1499   return str;
1500 }
1501
1502 /// get all characters after the first occurence of ch
1503 /// (returns empty string if ch not found)
1504 wxString wxString::AfterFirst(wxChar ch) const
1505 {
1506   wxString str;
1507   int iPos = Find(ch);
1508   if ( iPos != wxNOT_FOUND )
1509     str = c_str() + iPos + 1;
1510
1511   return str;
1512 }
1513
1514 // replace first (or all) occurences of some substring with another one
1515 size_t
1516 wxString::Replace(const wxChar *szOld, const wxChar *szNew, bool bReplaceAll)
1517 {
1518     // if we tried to replace an empty string we'd enter an infinite loop below
1519     wxCHECK_MSG( szOld && *szOld && szNew, 0,
1520                  _T("wxString::Replace(): invalid parameter") );
1521
1522   size_t uiCount = 0;   // count of replacements made
1523
1524   size_t uiOldLen = wxStrlen(szOld);
1525
1526   wxString strTemp;
1527   const wxChar *pCurrent = c_str();
1528   const wxChar *pSubstr;
1529   while ( *pCurrent != wxT('\0') ) {
1530     pSubstr = wxStrstr(pCurrent, szOld);
1531     if ( pSubstr == NULL ) {
1532       // strTemp is unused if no replacements were made, so avoid the copy
1533       if ( uiCount == 0 )
1534         return 0;
1535
1536       strTemp += pCurrent;    // copy the rest
1537       break;                  // exit the loop
1538     }
1539     else {
1540       // take chars before match
1541       size_type len = strTemp.length();
1542       strTemp.append(pCurrent, pSubstr - pCurrent);
1543       if ( strTemp.length() != (size_t)(len + pSubstr - pCurrent) ) {
1544         wxFAIL_MSG( _T("out of memory in wxString::Replace") );
1545         return 0;
1546       }
1547       strTemp += szNew;
1548       pCurrent = pSubstr + uiOldLen;  // restart after match
1549
1550       uiCount++;
1551
1552       // stop now?
1553       if ( !bReplaceAll ) {
1554         strTemp += pCurrent;    // copy the rest
1555         break;                  // exit the loop
1556       }
1557     }
1558   }
1559
1560   // only done if there were replacements, otherwise would have returned above
1561   swap(strTemp);
1562
1563   return uiCount;
1564 }
1565
1566 bool wxString::IsAscii() const
1567 {
1568   const wxChar *s = (const wxChar*) *this;
1569   while(*s){
1570     if(!isascii(*s)) return(false);
1571     s++;
1572   }
1573   return(true);
1574 }
1575
1576 bool wxString::IsWord() const
1577 {
1578   const wxChar *s = (const wxChar*) *this;
1579   while(*s){
1580     if(!wxIsalpha(*s)) return(false);
1581     s++;
1582   }
1583   return(true);
1584 }
1585
1586 bool wxString::IsNumber() const
1587 {
1588   const wxChar *s = (const wxChar*) *this;
1589   if (wxStrlen(s))
1590      if ((s[0] == wxT('-')) || (s[0] == wxT('+'))) s++;
1591   while(*s){
1592     if(!wxIsdigit(*s)) return(false);
1593     s++;
1594   }
1595   return(true);
1596 }
1597
1598 wxString wxString::Strip(stripType w) const
1599 {
1600     wxString s = *this;
1601     if ( w & leading ) s.Trim(false);
1602     if ( w & trailing ) s.Trim(true);
1603     return s;
1604 }
1605
1606 // ---------------------------------------------------------------------------
1607 // case conversion
1608 // ---------------------------------------------------------------------------
1609
1610 wxString& wxString::MakeUpper()
1611 {
1612   for ( iterator it = begin(), en = end(); it != en; ++it )
1613     *it = (wxChar)wxToupper(*it);
1614
1615   return *this;
1616 }
1617
1618 wxString& wxString::MakeLower()
1619 {
1620   for ( iterator it = begin(), en = end(); it != en; ++it )
1621     *it = (wxChar)wxTolower(*it);
1622
1623   return *this;
1624 }
1625
1626 // ---------------------------------------------------------------------------
1627 // trimming and padding
1628 // ---------------------------------------------------------------------------
1629
1630 // some compilers (VC++ 6.0 not to name them) return true for a call to
1631 // isspace('ê') in the C locale which seems to be broken to me, but we have to
1632 // live with this by checking that the character is a 7 bit one - even if this
1633 // may fail to detect some spaces (I don't know if Unicode doesn't have
1634 // space-like symbols somewhere except in the first 128 chars), it is arguably
1635 // still better than trimming away accented letters
1636 inline int wxSafeIsspace(wxChar ch) { return (ch < 127) && wxIsspace(ch); }
1637
1638 // trims spaces (in the sense of isspace) from left or right side
1639 wxString& wxString::Trim(bool bFromRight)
1640 {
1641   // first check if we're going to modify the string at all
1642   if ( !empty() &&
1643        (
1644         (bFromRight && wxSafeIsspace(GetChar(Len() - 1))) ||
1645         (!bFromRight && wxSafeIsspace(GetChar(0u)))
1646        )
1647      )
1648   {
1649     if ( bFromRight )
1650     {
1651       // find last non-space character
1652       iterator psz = begin() + length() - 1;
1653       while ( wxSafeIsspace(*psz) && (psz >= begin()) )
1654         psz--;
1655
1656       // truncate at trailing space start
1657       *++psz = wxT('\0');
1658       erase(psz, end());
1659     }
1660     else
1661     {
1662       // find first non-space character
1663       iterator psz = begin();
1664       while ( wxSafeIsspace(*psz) )
1665         psz++;
1666
1667       // fix up data and length
1668       erase(begin(), psz);
1669     }
1670   }
1671
1672   return *this;
1673 }
1674
1675 // adds nCount characters chPad to the string from either side
1676 wxString& wxString::Pad(size_t nCount, wxChar chPad, bool bFromRight)
1677 {
1678   wxString s(chPad, nCount);
1679
1680   if ( bFromRight )
1681     *this += s;
1682   else
1683   {
1684     s += *this;
1685     swap(s);
1686   }
1687
1688   return *this;
1689 }
1690
1691 // truncate the string
1692 wxString& wxString::Truncate(size_t uiLen)
1693 {
1694   if ( uiLen < Len() ) {
1695     erase(begin() + uiLen, end());
1696   }
1697   //else: nothing to do, string is already short enough
1698
1699   return *this;
1700 }
1701
1702 // ---------------------------------------------------------------------------
1703 // finding (return wxNOT_FOUND if not found and index otherwise)
1704 // ---------------------------------------------------------------------------
1705
1706 // find a character
1707 int wxString::Find(wxChar ch, bool bFromEnd) const
1708 {
1709   size_type idx = bFromEnd ? find_last_of(ch) : find_first_of(ch);
1710
1711   return (idx == npos) ? wxNOT_FOUND : (int)idx;
1712 }
1713
1714 // find a sub-string (like strstr)
1715 int wxString::Find(const wxChar *pszSub) const
1716 {
1717   size_type idx = find(pszSub);
1718
1719   return (idx == npos) ? wxNOT_FOUND : (int)idx;
1720 }
1721
1722 // ----------------------------------------------------------------------------
1723 // conversion to numbers
1724 // ----------------------------------------------------------------------------
1725
1726 bool wxString::ToLong(long *val, int base) const
1727 {
1728     wxCHECK_MSG( val, false, _T("NULL pointer in wxString::ToLong") );
1729     wxASSERT_MSG( !base || (base > 1 && base <= 36), _T("invalid base") );
1730
1731     const wxChar *start = c_str();
1732     wxChar *end;
1733     *val = wxStrtol(start, &end, base);
1734
1735     // return true only if scan was stopped by the terminating NUL and if the
1736     // string was not empty to start with
1737     return !*end && (end != start);
1738 }
1739
1740 bool wxString::ToULong(unsigned long *val, int base) const
1741 {
1742     wxCHECK_MSG( val, false, _T("NULL pointer in wxString::ToULong") );
1743     wxASSERT_MSG( !base || (base > 1 && base <= 36), _T("invalid base") );
1744
1745     const wxChar *start = c_str();
1746     wxChar *end;
1747     *val = wxStrtoul(start, &end, base);
1748
1749     // return true only if scan was stopped by the terminating NUL and if the
1750     // string was not empty to start with
1751     return !*end && (end != start);
1752 }
1753
1754 bool wxString::ToDouble(double *val) const
1755 {
1756     wxCHECK_MSG( val, false, _T("NULL pointer in wxString::ToDouble") );
1757
1758     const wxChar *start = c_str();
1759     wxChar *end;
1760     *val = wxStrtod(start, &end);
1761
1762     // return true only if scan was stopped by the terminating NUL and if the
1763     // string was not empty to start with
1764     return !*end && (end != start);
1765 }
1766
1767 // ---------------------------------------------------------------------------
1768 // formatted output
1769 // ---------------------------------------------------------------------------
1770
1771 /* static */
1772 wxString wxString::Format(const wxChar *pszFormat, ...)
1773 {
1774     va_list argptr;
1775     va_start(argptr, pszFormat);
1776
1777     wxString s;
1778     s.PrintfV(pszFormat, argptr);
1779
1780     va_end(argptr);
1781
1782     return s;
1783 }
1784
1785 /* static */
1786 wxString wxString::FormatV(const wxChar *pszFormat, va_list argptr)
1787 {
1788     wxString s;
1789     s.PrintfV(pszFormat, argptr);
1790     return s;
1791 }
1792
1793 int wxString::Printf(const wxChar *pszFormat, ...)
1794 {
1795     va_list argptr;
1796     va_start(argptr, pszFormat);
1797
1798     int iLen = PrintfV(pszFormat, argptr);
1799
1800     va_end(argptr);
1801
1802     return iLen;
1803 }
1804
1805 int wxString::PrintfV(const wxChar* pszFormat, va_list argptr)
1806 {
1807     int size = 1024;
1808
1809     for ( ;; )
1810     {
1811         wxStringBuffer tmp(*this, size + 1);
1812         wxChar* buf = tmp;
1813
1814         if ( !buf )
1815         {
1816             // out of memory
1817             return -1;
1818         }
1819
1820         // wxVsnprintf() may modify the original arg pointer, so pass it
1821         // only a copy
1822         va_list argptrcopy;
1823         wxVaCopy(argptrcopy, argptr);
1824         int len = wxVsnprintf(buf, size, pszFormat, argptrcopy);
1825         va_end(argptrcopy);
1826
1827         // some implementations of vsnprintf() don't NUL terminate
1828         // the string if there is not enough space for it so
1829         // always do it manually
1830         buf[size] = _T('\0');
1831
1832         // vsnprintf() may return either -1 (traditional Unix behaviour) or the
1833         // total number of characters which would have been written if the
1834         // buffer were large enough
1835         // also, it may return an errno may be something like EILSEQ,
1836         // in which case we need to break out
1837         if ( (len >= 0 && len <= size)
1838         // No EOVERFLOW on Windows nor Palm 6.0 nor OpenVMS
1839 #if !defined(__WXMSW__) && !defined(__WXPALMOS__) && !defined( __VMS )
1840             || errno != EOVERFLOW
1841 #endif
1842             )
1843         {
1844             // ok, there was enough space
1845             break;
1846         }
1847
1848         // still not enough, double it again
1849         size *= 2;
1850     }
1851
1852     // we could have overshot
1853     Shrink();
1854
1855     return Len();
1856 }
1857
1858 // ----------------------------------------------------------------------------
1859 // misc other operations
1860 // ----------------------------------------------------------------------------
1861
1862 // returns true if the string matches the pattern which may contain '*' and
1863 // '?' metacharacters (as usual, '?' matches any character and '*' any number
1864 // of them)
1865 bool wxString::Matches(const wxChar *pszMask) const
1866 {
1867     // I disable this code as it doesn't seem to be faster (in fact, it seems
1868     // to be much slower) than the old, hand-written code below and using it
1869     // here requires always linking with libregex even if the user code doesn't
1870     // use it
1871 #if 0 // wxUSE_REGEX
1872     // first translate the shell-like mask into a regex
1873     wxString pattern;
1874     pattern.reserve(wxStrlen(pszMask));
1875
1876     pattern += _T('^');
1877     while ( *pszMask )
1878     {
1879         switch ( *pszMask )
1880         {
1881             case _T('?'):
1882                 pattern += _T('.');
1883                 break;
1884
1885             case _T('*'):
1886                 pattern += _T(".*");
1887                 break;
1888
1889             case _T('^'):
1890             case _T('.'):
1891             case _T('$'):
1892             case _T('('):
1893             case _T(')'):
1894             case _T('|'):
1895             case _T('+'):
1896             case _T('\\'):
1897                 // these characters are special in a RE, quote them
1898                 // (however note that we don't quote '[' and ']' to allow
1899                 // using them for Unix shell like matching)
1900                 pattern += _T('\\');
1901                 // fall through
1902
1903             default:
1904                 pattern += *pszMask;
1905         }
1906
1907         pszMask++;
1908     }
1909     pattern += _T('$');
1910
1911     // and now use it
1912     return wxRegEx(pattern, wxRE_NOSUB | wxRE_EXTENDED).Matches(c_str());
1913 #else // !wxUSE_REGEX
1914   // TODO: this is, of course, awfully inefficient...
1915
1916   // the char currently being checked
1917   const wxChar *pszTxt = c_str();
1918
1919   // the last location where '*' matched
1920   const wxChar *pszLastStarInText = NULL;
1921   const wxChar *pszLastStarInMask = NULL;
1922
1923 match:
1924   for ( ; *pszMask != wxT('\0'); pszMask++, pszTxt++ ) {
1925     switch ( *pszMask ) {
1926       case wxT('?'):
1927         if ( *pszTxt == wxT('\0') )
1928           return false;
1929
1930         // pszTxt and pszMask will be incremented in the loop statement
1931
1932         break;
1933
1934       case wxT('*'):
1935         {
1936           // remember where we started to be able to backtrack later
1937           pszLastStarInText = pszTxt;
1938           pszLastStarInMask = pszMask;
1939
1940           // ignore special chars immediately following this one
1941           // (should this be an error?)
1942           while ( *pszMask == wxT('*') || *pszMask == wxT('?') )
1943             pszMask++;
1944
1945           // if there is nothing more, match
1946           if ( *pszMask == wxT('\0') )
1947             return true;
1948
1949           // are there any other metacharacters in the mask?
1950           size_t uiLenMask;
1951           const wxChar *pEndMask = wxStrpbrk(pszMask, wxT("*?"));
1952
1953           if ( pEndMask != NULL ) {
1954             // we have to match the string between two metachars
1955             uiLenMask = pEndMask - pszMask;
1956           }
1957           else {
1958             // we have to match the remainder of the string
1959             uiLenMask = wxStrlen(pszMask);
1960           }
1961
1962           wxString strToMatch(pszMask, uiLenMask);
1963           const wxChar* pMatch = wxStrstr(pszTxt, strToMatch);
1964           if ( pMatch == NULL )
1965             return false;
1966
1967           // -1 to compensate "++" in the loop
1968           pszTxt = pMatch + uiLenMask - 1;
1969           pszMask += uiLenMask - 1;
1970         }
1971         break;
1972
1973       default:
1974         if ( *pszMask != *pszTxt )
1975           return false;
1976         break;
1977     }
1978   }
1979
1980   // match only if nothing left
1981   if ( *pszTxt == wxT('\0') )
1982     return true;
1983
1984   // if we failed to match, backtrack if we can
1985   if ( pszLastStarInText ) {
1986     pszTxt = pszLastStarInText + 1;
1987     pszMask = pszLastStarInMask;
1988
1989     pszLastStarInText = NULL;
1990
1991     // don't bother resetting pszLastStarInMask, it's unnecessary
1992
1993     goto match;
1994   }
1995
1996   return false;
1997 #endif // wxUSE_REGEX/!wxUSE_REGEX
1998 }
1999
2000 // Count the number of chars
2001 int wxString::Freq(wxChar ch) const
2002 {
2003     int count = 0;
2004     int len = Len();
2005     for (int i = 0; i < len; i++)
2006     {
2007         if (GetChar(i) == ch)
2008             count ++;
2009     }
2010     return count;
2011 }
2012
2013 // convert to upper case, return the copy of the string
2014 wxString wxString::Upper() const
2015 { wxString s(*this); return s.MakeUpper(); }
2016
2017 // convert to lower case, return the copy of the string
2018 wxString wxString::Lower() const { wxString s(*this); return s.MakeLower(); }
2019
2020 int wxString::sprintf(const wxChar *pszFormat, ...)
2021   {
2022     va_list argptr;
2023     va_start(argptr, pszFormat);
2024     int iLen = PrintfV(pszFormat, argptr);
2025     va_end(argptr);
2026     return iLen;
2027   }
2028
2029 // ============================================================================
2030 // ArrayString
2031 // ============================================================================
2032
2033 #include "wx/arrstr.h"
2034
2035 #if !wxUSE_STL
2036
2037 // size increment = min(50% of current size, ARRAY_MAXSIZE_INCREMENT)
2038 #define   ARRAY_MAXSIZE_INCREMENT       4096
2039
2040 #ifndef   ARRAY_DEFAULT_INITIAL_SIZE    // also defined in dynarray.h
2041 #define   ARRAY_DEFAULT_INITIAL_SIZE    (16)
2042 #endif
2043
2044 #define   STRING(p)   ((wxString *)(&(p)))
2045
2046 // ctor
2047 void wxArrayString::Init(bool autoSort)
2048 {
2049   m_nSize  =
2050   m_nCount = 0;
2051   m_pItems = (wxChar **) NULL;
2052   m_autoSort = autoSort;
2053 }
2054
2055 // copy ctor
2056 wxArrayString::wxArrayString(const wxArrayString& src)
2057 {
2058   Init(src.m_autoSort);
2059
2060   *this = src;
2061 }
2062
2063 // assignment operator
2064 wxArrayString& wxArrayString::operator=(const wxArrayString& src)
2065 {
2066   if ( m_nSize > 0 )
2067     Clear();
2068
2069   Copy(src);
2070
2071   m_autoSort = src.m_autoSort;
2072
2073   return *this;
2074 }
2075
2076 void wxArrayString::Copy(const wxArrayString& src)
2077 {
2078   if ( src.m_nCount > ARRAY_DEFAULT_INITIAL_SIZE )
2079     Alloc(src.m_nCount);
2080
2081   for ( size_t n = 0; n < src.m_nCount; n++ )
2082     Add(src[n]);
2083 }
2084
2085 // grow the array
2086 void wxArrayString::Grow(size_t nIncrement)
2087 {
2088   // only do it if no more place
2089   if ( (m_nSize - m_nCount) < nIncrement ) {
2090     // if ARRAY_DEFAULT_INITIAL_SIZE were set to 0, the initially empty would
2091     // be never resized!
2092     #if ARRAY_DEFAULT_INITIAL_SIZE == 0
2093       #error "ARRAY_DEFAULT_INITIAL_SIZE must be > 0!"
2094     #endif
2095
2096     if ( m_nSize == 0 ) {
2097       // was empty, alloc some memory
2098       m_nSize = ARRAY_DEFAULT_INITIAL_SIZE;
2099       if (m_nSize < nIncrement)
2100           m_nSize = nIncrement;
2101       m_pItems = new wxChar *[m_nSize];
2102     }
2103     else {
2104       // otherwise when it's called for the first time, nIncrement would be 0
2105       // and the array would never be expanded
2106       // add 50% but not too much
2107       size_t ndefIncrement = m_nSize < ARRAY_DEFAULT_INITIAL_SIZE
2108                           ? ARRAY_DEFAULT_INITIAL_SIZE : m_nSize >> 1;
2109       if ( ndefIncrement > ARRAY_MAXSIZE_INCREMENT )
2110         ndefIncrement = ARRAY_MAXSIZE_INCREMENT;
2111       if ( nIncrement < ndefIncrement )
2112         nIncrement = ndefIncrement;
2113       m_nSize += nIncrement;
2114       wxChar **pNew = new wxChar *[m_nSize];
2115
2116       // copy data to new location
2117       memcpy(pNew, m_pItems, m_nCount*sizeof(wxChar *));
2118
2119       // delete old memory (but do not release the strings!)
2120       wxDELETEA(m_pItems);
2121
2122       m_pItems = pNew;
2123     }
2124   }
2125 }
2126
2127 void wxArrayString::Free()
2128 {
2129   for ( size_t n = 0; n < m_nCount; n++ ) {
2130     STRING(m_pItems[n])->GetStringData()->Unlock();
2131   }
2132 }
2133
2134 // deletes all the strings from the list
2135 void wxArrayString::Empty()
2136 {
2137   Free();
2138
2139   m_nCount = 0;
2140 }
2141
2142 // as Empty, but also frees memory
2143 void wxArrayString::Clear()
2144 {
2145   Free();
2146
2147   m_nSize  =
2148   m_nCount = 0;
2149
2150   wxDELETEA(m_pItems);
2151 }
2152
2153 // dtor
2154 wxArrayString::~wxArrayString()
2155 {
2156   Free();
2157
2158   wxDELETEA(m_pItems);
2159 }
2160
2161 void wxArrayString::reserve(size_t nSize)
2162 {
2163     Alloc(nSize);
2164 }
2165
2166 // pre-allocates memory (frees the previous data!)
2167 void wxArrayString::Alloc(size_t nSize)
2168 {
2169   // only if old buffer was not big enough
2170   if ( nSize > m_nSize ) {
2171     Free();
2172     wxDELETEA(m_pItems);
2173     m_pItems = new wxChar *[nSize];
2174     m_nSize  = nSize;
2175   }
2176
2177   m_nCount = 0;
2178 }
2179
2180 // minimizes the memory usage by freeing unused memory
2181 void wxArrayString::Shrink()
2182 {
2183   // only do it if we have some memory to free
2184   if( m_nCount < m_nSize ) {
2185     // allocates exactly as much memory as we need
2186     wxChar **pNew = new wxChar *[m_nCount];
2187
2188     // copy data to new location
2189     memcpy(pNew, m_pItems, m_nCount*sizeof(wxChar *));
2190     delete [] m_pItems;
2191     m_pItems = pNew;
2192   }
2193 }
2194
2195 #if WXWIN_COMPATIBILITY_2_4
2196
2197 // return a wxString[] as required for some control ctors.
2198 wxString* wxArrayString::GetStringArray() const
2199 {
2200     wxString *array = 0;
2201
2202     if( m_nCount > 0 )
2203     {
2204         array = new wxString[m_nCount];
2205         for( size_t i = 0; i < m_nCount; i++ )
2206             array[i] = m_pItems[i];
2207     }
2208
2209     return array;
2210 }
2211
2212 void wxArrayString::Remove(size_t nIndex, size_t nRemove)
2213 {
2214     RemoveAt(nIndex, nRemove);
2215 }
2216
2217 #endif // WXWIN_COMPATIBILITY_2_4
2218
2219 // searches the array for an item (forward or backwards)
2220 int wxArrayString::Index(const wxChar *sz, bool bCase, bool bFromEnd) const
2221 {
2222   if ( m_autoSort ) {
2223     // use binary search in the sorted array
2224     wxASSERT_MSG( bCase && !bFromEnd,
2225                   wxT("search parameters ignored for auto sorted array") );
2226
2227     size_t i,
2228            lo = 0,
2229            hi = m_nCount;
2230     int res;
2231     while ( lo < hi ) {
2232       i = (lo + hi)/2;
2233
2234       res = wxStrcmp(sz, m_pItems[i]);
2235       if ( res < 0 )
2236         hi = i;
2237       else if ( res > 0 )
2238         lo = i + 1;
2239       else
2240         return i;
2241     }
2242
2243     return wxNOT_FOUND;
2244   }
2245   else {
2246     // use linear search in unsorted array
2247     if ( bFromEnd ) {
2248       if ( m_nCount > 0 ) {
2249         size_t ui = m_nCount;
2250         do {
2251           if ( STRING(m_pItems[--ui])->IsSameAs(sz, bCase) )
2252             return ui;
2253         }
2254         while ( ui != 0 );
2255       }
2256     }
2257     else {
2258       for( size_t ui = 0; ui < m_nCount; ui++ ) {
2259         if( STRING(m_pItems[ui])->IsSameAs(sz, bCase) )
2260           return ui;
2261       }
2262     }
2263   }
2264
2265   return wxNOT_FOUND;
2266 }
2267
2268 // add item at the end
2269 size_t wxArrayString::Add(const wxString& str, size_t nInsert)
2270 {
2271   if ( m_autoSort ) {
2272     // insert the string at the correct position to keep the array sorted
2273     size_t i,
2274            lo = 0,
2275            hi = m_nCount;
2276     int res;
2277     while ( lo < hi ) {
2278       i = (lo + hi)/2;
2279
2280       res = str.Cmp(m_pItems[i]);
2281       if ( res < 0 )
2282         hi = i;
2283       else if ( res > 0 )
2284         lo = i + 1;
2285       else {
2286         lo = hi = i;
2287         break;
2288       }
2289     }
2290
2291     wxASSERT_MSG( lo == hi, wxT("binary search broken") );
2292
2293     Insert(str, lo, nInsert);
2294
2295     return (size_t)lo;
2296   }
2297   else {
2298     wxASSERT( str.GetStringData()->IsValid() );
2299
2300     Grow(nInsert);
2301
2302     for (size_t i = 0; i < nInsert; i++)
2303     {
2304         // the string data must not be deleted!
2305         str.GetStringData()->Lock();
2306
2307         // just append
2308         m_pItems[m_nCount + i] = (wxChar *)str.c_str(); // const_cast
2309     }
2310     size_t ret = m_nCount;
2311     m_nCount += nInsert;
2312     return ret;
2313   }
2314 }
2315
2316 // add item at the given position
2317 void wxArrayString::Insert(const wxString& str, size_t nIndex, size_t nInsert)
2318 {
2319   wxASSERT( str.GetStringData()->IsValid() );
2320
2321   wxCHECK_RET( nIndex <= m_nCount, wxT("bad index in wxArrayString::Insert") );
2322   wxCHECK_RET( m_nCount <= m_nCount + nInsert,
2323                wxT("array size overflow in wxArrayString::Insert") );
2324
2325   Grow(nInsert);
2326
2327   memmove(&m_pItems[nIndex + nInsert], &m_pItems[nIndex],
2328           (m_nCount - nIndex)*sizeof(wxChar *));
2329
2330   for (size_t i = 0; i < nInsert; i++)
2331   {
2332       str.GetStringData()->Lock();
2333       m_pItems[nIndex + i] = (wxChar *)str.c_str();
2334   }
2335   m_nCount += nInsert;
2336 }
2337
2338 // range insert (STL 23.2.4.3)
2339 void
2340 wxArrayString::insert(iterator it, const_iterator first, const_iterator last)
2341 {
2342     const int idx = it - begin();
2343
2344     // grow it once
2345     Grow(last - first);
2346
2347     // reset "it" since it can change inside Grow()
2348     it = begin() + idx;
2349
2350     while ( first != last )
2351     {
2352         it = insert(it, *first);
2353
2354         // insert returns an iterator to the last element inserted but we need
2355         // insert the next after this one, that is before the next one
2356         ++it;
2357
2358         ++first;
2359     }
2360 }
2361
2362 // expand the array
2363 void wxArrayString::SetCount(size_t count)
2364 {
2365     Alloc(count);
2366
2367     wxString s;
2368     while ( m_nCount < count )
2369         m_pItems[m_nCount++] = (wxChar *)s.c_str();
2370 }
2371
2372 // removes item from array (by index)
2373 void wxArrayString::RemoveAt(size_t nIndex, size_t nRemove)
2374 {
2375   wxCHECK_RET( nIndex < m_nCount, wxT("bad index in wxArrayString::Remove") );
2376   wxCHECK_RET( nIndex + nRemove <= m_nCount,
2377                wxT("removing too many elements in wxArrayString::Remove") );
2378
2379   // release our lock
2380   for (size_t i = 0; i < nRemove; i++)
2381       Item(nIndex + i).GetStringData()->Unlock();
2382
2383   memmove(&m_pItems[nIndex], &m_pItems[nIndex + nRemove],
2384           (m_nCount - nIndex - nRemove)*sizeof(wxChar *));
2385   m_nCount -= nRemove;
2386 }
2387
2388 // removes item from array (by value)
2389 void wxArrayString::Remove(const wxChar *sz)
2390 {
2391   int iIndex = Index(sz);
2392
2393   wxCHECK_RET( iIndex != wxNOT_FOUND,
2394                wxT("removing inexistent element in wxArrayString::Remove") );
2395
2396   RemoveAt(iIndex);
2397 }
2398
2399 void wxArrayString::assign(const_iterator first, const_iterator last)
2400 {
2401     reserve(last - first);
2402     for(; first != last; ++first)
2403         push_back(*first);
2404 }
2405
2406 // ----------------------------------------------------------------------------
2407 // sorting
2408 // ----------------------------------------------------------------------------
2409
2410 // we can only sort one array at a time with the quick-sort based
2411 // implementation
2412 #if wxUSE_THREADS
2413   // need a critical section to protect access to gs_compareFunction and
2414   // gs_sortAscending variables
2415   static wxCriticalSection *gs_critsectStringSort = NULL;
2416
2417   // call this before the value of the global sort vars is changed/after
2418   // you're finished with them
2419   #define START_SORT()     wxASSERT( !gs_critsectStringSort );                \
2420                            gs_critsectStringSort = new wxCriticalSection;     \
2421                            gs_critsectStringSort->Enter()
2422   #define END_SORT()       gs_critsectStringSort->Leave();                    \
2423                            delete gs_critsectStringSort;                      \
2424                            gs_critsectStringSort = NULL
2425 #else // !threads
2426   #define START_SORT()
2427   #define END_SORT()
2428 #endif // wxUSE_THREADS
2429
2430 // function to use for string comparaison
2431 static wxArrayString::CompareFunction gs_compareFunction = NULL;
2432
2433 // if we don't use the compare function, this flag tells us if we sort the
2434 // array in ascending or descending order
2435 static bool gs_sortAscending = true;
2436
2437 // function which is called by quick sort
2438 extern "C" int wxC_CALLING_CONV     // LINKAGEMODE
2439 wxStringCompareFunction(const void *first, const void *second)
2440 {
2441   wxString *strFirst = (wxString *)first;
2442   wxString *strSecond = (wxString *)second;
2443
2444   if ( gs_compareFunction ) {
2445     return gs_compareFunction(*strFirst, *strSecond);
2446   }
2447   else {
2448     // maybe we should use wxStrcoll
2449     int result = strFirst->Cmp(*strSecond);
2450
2451     return gs_sortAscending ? result : -result;
2452   }
2453 }
2454
2455 // sort array elements using passed comparaison function
2456 void wxArrayString::Sort(CompareFunction compareFunction)
2457 {
2458   START_SORT();
2459
2460   wxASSERT( !gs_compareFunction );  // must have been reset to NULL
2461   gs_compareFunction = compareFunction;
2462
2463   DoSort();
2464
2465   // reset it to NULL so that Sort(bool) will work the next time
2466   gs_compareFunction = NULL;
2467
2468   END_SORT();
2469 }
2470
2471 typedef  int (wxC_CALLING_CONV * wxStringCompareFn)(const void *first, const void *second);
2472
2473 void wxArrayString::Sort(CompareFunction2 compareFunction)
2474 {
2475   qsort(m_pItems, m_nCount, sizeof(wxChar *), (wxStringCompareFn)compareFunction);
2476 }
2477
2478 void wxArrayString::Sort(bool reverseOrder)
2479 {
2480   Sort(reverseOrder ? wxStringSortDescending : wxStringSortAscending);
2481 }
2482
2483 void wxArrayString::DoSort()
2484 {
2485   wxCHECK_RET( !m_autoSort, wxT("can't use this method with sorted arrays") );
2486
2487   // just sort the pointers using qsort() - of course it only works because
2488   // wxString() *is* a pointer to its data
2489   qsort(m_pItems, m_nCount, sizeof(wxChar *), wxStringCompareFunction);
2490 }
2491
2492 bool wxArrayString::operator==(const wxArrayString& a) const
2493 {
2494     if ( m_nCount != a.m_nCount )
2495         return false;
2496
2497     for ( size_t n = 0; n < m_nCount; n++ )
2498     {
2499         if ( Item(n) != a[n] )
2500             return false;
2501     }
2502
2503     return true;
2504 }
2505
2506 #endif // !wxUSE_STL
2507
2508 int wxCMPFUNC_CONV wxStringSortAscending(wxString* s1, wxString* s2)
2509 {
2510     return  s1->Cmp(*s2);
2511 }
2512
2513 int wxCMPFUNC_CONV wxStringSortDescending(wxString* s1, wxString* s2)
2514 {
2515     return -s1->Cmp(*s2);
2516 }