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   #include "wx/thread.h"
  39 #endif
  40
  41 #include <ctype.h>
  42 #include <string.h>
  43 #include <stdlib.h>
  44
  45 #ifdef __SALFORDC__
  46   #include <clib.h>
  47 #endif
  48
  49 #if wxUSE_WCSRTOMBS
  50   #include <wchar.h>    // for wcsrtombs(), see comments where it's used
  51 #endif // GNU
  52
  53 #ifdef  WXSTRING_IS_WXOBJECT
  54   IMPLEMENT_DYNAMIC_CLASS(wxString, wxObject)
  55 #endif  //WXSTRING_IS_WXOBJECT
  56
  57 #if wxUSE_UNICODE
  58 #undef wxUSE_EXPERIMENTAL_PRINTF
  59 #define wxUSE_EXPERIMENTAL_PRINTF 1
  60 #endif
  61
  62 // allocating extra space for each string consumes more memory but speeds up
  63 // the concatenation operations (nLen is the current string's length)
  64 // NB: EXTRA_ALLOC must be >= 0!
  65 #define EXTRA_ALLOC       (19 - nLen % 16)
  66
  67 // ---------------------------------------------------------------------------
  68 // static class variables definition
  69 // ---------------------------------------------------------------------------
  70
  71 #ifdef  wxSTD_STRING_COMPATIBILITY
  72   const size_t wxString::npos = wxSTRING_MAXLEN;
  73 #endif // wxSTD_STRING_COMPATIBILITY
  74
  75 // ----------------------------------------------------------------------------
  76 // static data
  77 // ----------------------------------------------------------------------------
  78
  79 // for an empty string, GetStringData() will return this address: this
  80 // structure has the same layout as wxStringData and it's data() method will
  81 // return the empty string (dummy pointer)
  82 static const struct
  83 {
  84   wxStringData data;
  85   wxChar dummy;
  86 } g_strEmpty = { {-1, 0, 0}, wxT('\0') };
  87
  88 // empty C style string: points to 'string data' byte of g_strEmpty
  89 extern const wxChar WXDLLEXPORT *wxEmptyString = &g_strEmpty.dummy;
  90
  91 // ----------------------------------------------------------------------------
  92 // conditional compilation
  93 // ----------------------------------------------------------------------------
  94
  95 #if !defined(__WXSW__) && wxUSE_UNICODE
  96   #ifdef wxUSE_EXPERIMENTAL_PRINTF
  97     #undef wxUSE_EXPERIMENTAL_PRINTF
  98   #endif
  99   #define wxUSE_EXPERIMENTAL_PRINTF 1
 100 #endif
 101
 102 // we want to find out if the current platform supports vsnprintf()-like
 103 // function: for Unix this is done with configure, for Windows we test the
 104 // compiler explicitly.
 105 //
 106 // FIXME currently, this is only for ANSI (!Unicode) strings, so we call this
 107 //       function wxVsnprintfA (A for ANSI), should also find one for Unicode
 108 //       strings in Unicode build
 109 #ifdef __WXMSW__
 110     #if (defined(__VISUALC__) || defined(wxUSE_NORLANDER_HEADERS)) && !defined(__MINGW32__)
 111         #define wxVsnprintfA     _vsnprintf
 112     #endif
 113 #else   // !Windows
 114     #ifdef HAVE_VSNPRINTF
 115         #define wxVsnprintfA       vsnprintf
 116     #endif
 117 #endif  // Windows/!Windows
 118
 119 #ifndef wxVsnprintfA
 120     // in this case we'll use vsprintf() (which is ANSI and thus should be
 121     // always available), but it's unsafe because it doesn't check for buffer
 122     // size - so give a warning
 123     #define wxVsnprintfA(buf, len, format, arg) vsprintf(buf, format, arg)
 124
 125     #if defined(__VISUALC__)
 126         #pragma message("Using sprintf() because no snprintf()-like function defined")
 127     #elif defined(__GNUG__) && !defined(__UNIX__)
 128         #warning "Using sprintf() because no snprintf()-like function defined"
 129     #elif defined(__MWERKS__)
 130         #warning "Using sprintf() because no snprintf()-like function defined"
 131     #endif //compiler
 132 #endif // no vsnprintf
 133
 134 #ifdef _AIX
 135   // AIX has vsnprintf, but there's no prototype in the system headers.
 136   extern "C" int vsnprintf(char* str, size_t n, const char* format, va_list ap);
 137 #endif
 138
 139 // ----------------------------------------------------------------------------
 140 // global functions
 141 // ----------------------------------------------------------------------------
 142
 143 #if defined(wxSTD_STRING_COMPATIBILITY) && wxUSE_STD_IOSTREAM
 144
 145 // MS Visual C++ version 5.0 provides the new STL headers as well as the old
 146 // iostream ones.
 147 //
 148 // ATTN: you can _not_ use both of these in the same program!
 149
 150 istream& operator>>(istream& is, wxString& WXUNUSED(str))
 151 {
 152 #if 0
 153   int w = is.width(0);
 154   if ( is.ipfx(0) ) {
 155     streambuf *sb = is.rdbuf();
 156     str.erase();
 157     while ( true ) {
 158       int ch = sb->sbumpc ();
 159       if ( ch == EOF ) {
 160         is.setstate(ios::eofbit);
 161         break;
 162       }
 163       else if ( isspace(ch) ) {
 164         sb->sungetc();
 165         break;
 166       }
 167
 168       str += ch;
 169       if ( --w == 1 )
 170         break;
 171     }
 172   }
 173
 174   is.isfx();
 175   if ( str.length() == 0 )
 176     is.setstate(ios::failbit);
 177 #endif
 178   return is;
 179 }
 180
 181 ostream& operator<<(ostream& os, const wxString& str)
 182 {
 183   os << str.c_str();
 184   return os;
 185 }
 186
 187 #endif  //std::string compatibility
 188
 189 extern int WXDLLEXPORT wxVsnprintf(wxChar *buf, size_t len,
 190                                    const wxChar *format, va_list argptr)
 191 {
 192 #if wxUSE_UNICODE
 193     // FIXME should use wvsnprintf() or whatever if it's available
 194     wxString s;
 195     int iLen = s.PrintfV(format, argptr);
 196     if ( iLen != -1 )
 197     {
 198         wxStrncpy(buf, s.c_str(), iLen);
 199     }
 200
 201     return iLen;
 202 #else // ANSI
 203     // vsnprintf() will not terminate the string with '\0' if there is not
 204     // enough place, but we want the string to always be NUL terminated
 205     int rc = wxVsnprintfA(buf, len - 1, format, argptr);
 206     if ( rc == -1 )
 207     {
 208         buf[len] = 0;
 209     }
 210
 211     return rc;
 212 #endif // Unicode/ANSI
 213 }
 214
 215 extern int WXDLLEXPORT wxSnprintf(wxChar *buf, size_t len,
 216                                   const wxChar *format, ...)
 217 {
 218     va_list argptr;
 219     va_start(argptr, format);
 220
 221     int iLen = wxVsnprintf(buf, len, format, argptr);
 222
 223     va_end(argptr);
 224
 225     return iLen;
 226 }
 227
 228 // ----------------------------------------------------------------------------
 229 // private classes
 230 // ----------------------------------------------------------------------------
 231
 232 // this small class is used to gather statistics for performance tuning
 233 //#define WXSTRING_STATISTICS
 234 #ifdef  WXSTRING_STATISTICS
 235   class Averager
 236   {
 237   public:
 238     Averager(const char *sz) { m_sz = sz; m_nTotal = m_nCount = 0; }
 239    ~Averager()
 240    { printf("wxString: average %s = %f\n", m_sz, ((float)m_nTotal)/m_nCount); }
 241
 242     void Add(size_t n) { m_nTotal += n; m_nCount++; }
 243
 244   private:
 245     size_t m_nCount, m_nTotal;
 246     const char *m_sz;
 247   } g_averageLength("allocation size"),
 248     g_averageSummandLength("summand length"),
 249     g_averageConcatHit("hit probability in concat"),
 250     g_averageInitialLength("initial string length");
 251
 252   #define STATISTICS_ADD(av, val) g_average##av.Add(val)
 253 #else
 254   #define STATISTICS_ADD(av, val)
 255 #endif // WXSTRING_STATISTICS
 256
 257 // ===========================================================================
 258 // wxString class core
 259 // ===========================================================================
 260
 261 // ---------------------------------------------------------------------------
 262 // construction
 263 // ---------------------------------------------------------------------------
 264
 265 // constructs string of <nLength> copies of character <ch>
 266 wxString::wxString(wxChar ch, size_t nLength)
 267 {
 268   Init();
 269
 270   if ( nLength > 0 ) {
 271     AllocBuffer(nLength);
 272
 273 #if wxUSE_UNICODE
 274     // memset only works on char
 275     for (size_t n=0; n<nLength; n++) m_pchData[n] = ch;
 276 #else
 277     memset(m_pchData, ch, nLength);
 278 #endif
 279   }
 280 }
 281
 282 // takes nLength elements of psz starting at nPos
 283 void wxString::InitWith(const wxChar *psz, size_t nPos, size_t nLength)
 284 {
 285   Init();
 286
 287   wxASSERT( nPos <= wxStrlen(psz) );
 288
 289   if ( nLength == wxSTRING_MAXLEN )
 290     nLength = wxStrlen(psz + nPos);
 291
 292   STATISTICS_ADD(InitialLength, nLength);
 293
 294   if ( nLength > 0 ) {
 295     // trailing '\0' is written in AllocBuffer()
 296     AllocBuffer(nLength);
 297     memcpy(m_pchData, psz + nPos, nLength*sizeof(wxChar));
 298   }
 299 }
 300
 301 #ifdef  wxSTD_STRING_COMPATIBILITY
 302
 303 // poor man's iterators are "void *" pointers
 304 wxString::wxString(const void *pStart, const void *pEnd)
 305 {
 306   InitWith((const wxChar *)pStart, 0,
 307            (const wxChar *)pEnd - (const wxChar *)pStart);
 308 }
 309
 310 #endif  //std::string compatibility
 311
 312 #if wxUSE_UNICODE
 313
 314 // from multibyte string
 315 wxString::wxString(const char *psz, wxMBConv& conv, size_t nLength)
 316 {
 317   // first get necessary size
 318   size_t nLen = psz ? conv.MB2WC((wchar_t *) NULL, psz, 0) : 0;
 319
 320   // nLength is number of *Unicode* characters here!
 321   if ((nLen != (size_t)-1) && (nLen > nLength))
 322     nLen = nLength;
 323
 324   // empty?
 325   if ( (nLen != 0) && (nLen != (size_t)-1) ) {
 326     AllocBuffer(nLen);
 327     conv.MB2WC(m_pchData, psz, nLen);
 328   }
 329   else {
 330     Init();
 331   }
 332 }
 333
 334 #else // ANSI
 335
 336 #if wxUSE_WCHAR_T
 337 // from wide string
 338 wxString::wxString(const wchar_t *pwz)
 339 {
 340   // first get necessary size
 341   size_t nLen = pwz ? wxWC2MB((char *) NULL, pwz, 0) : 0;
 342
 343   // empty?
 344   if ( (nLen != 0) && (nLen != (size_t)-1) ) {
 345     AllocBuffer(nLen);
 346     wxWC2MB(m_pchData, pwz, nLen);
 347   }
 348   else {
 349     Init();
 350   }
 351 }
 352 #endif // wxUSE_WCHAR_T
 353
 354 #endif // Unicode/ANSI
 355
 356 // ---------------------------------------------------------------------------
 357 // memory allocation
 358 // ---------------------------------------------------------------------------
 359
 360 // allocates memory needed to store a C string of length nLen
 361 void wxString::AllocBuffer(size_t nLen)
 362 {
 363   wxASSERT( nLen >  0         );    //
 364   wxASSERT( nLen <= INT_MAX-1 );    // max size (enough room for 1 extra)
 365
 366   STATISTICS_ADD(Length, nLen);
 367
 368   // allocate memory:
 369   // 1) one extra character for '\0' termination
 370   // 2) sizeof(wxStringData) for housekeeping info
 371   wxStringData* pData = (wxStringData*)
 372     malloc(sizeof(wxStringData) + (nLen + EXTRA_ALLOC + 1)*sizeof(wxChar));
 373   pData->nRefs        = 1;
 374   pData->nDataLength  = nLen;
 375   pData->nAllocLength = nLen + EXTRA_ALLOC;
 376   m_pchData           = pData->data();  // data starts after wxStringData
 377   m_pchData[nLen]     = wxT('\0');
 378 }
 379
 380 // must be called before changing this string
 381 void wxString::CopyBeforeWrite()
 382 {
 383   wxStringData* pData = GetStringData();
 384
 385   if ( pData->IsShared() ) {
 386     pData->Unlock();                // memory not freed because shared
 387     size_t nLen = pData->nDataLength;
 388     AllocBuffer(nLen);
 389     memcpy(m_pchData, pData->data(), nLen*sizeof(wxChar));
 390   }
 391
 392   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 393 }
 394
 395 // must be called before replacing contents of this string
 396 void wxString::AllocBeforeWrite(size_t nLen)
 397 {
 398   wxASSERT( nLen != 0 );  // doesn't make any sense
 399
 400   // must not share string and must have enough space
 401   wxStringData* pData = GetStringData();
 402   if ( pData->IsShared() || pData->IsEmpty() ) {
 403     // can't work with old buffer, get new one
 404     pData->Unlock();
 405     AllocBuffer(nLen);
 406   }
 407   else {
 408     if ( nLen > pData->nAllocLength ) {
 409       // realloc the buffer instead of calling malloc() again, this is more
 410       // efficient
 411       STATISTICS_ADD(Length, nLen);
 412
 413       nLen += EXTRA_ALLOC;
 414
 415       wxStringData *pDataOld = pData;
 416       pData = (wxStringData*)
 417           realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar));
 418       if ( !pData ) {
 419         // out of memory
 420         free(pDataOld);
 421
 422         // FIXME we're going to crash...
 423         return;
 424       }
 425
 426       pData->nAllocLength = nLen;
 427       m_pchData = pData->data();
 428     }
 429
 430     // now we have enough space, just update the string length
 431     pData->nDataLength = nLen;
 432   }
 433
 434   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 435 }
 436
 437 // allocate enough memory for nLen characters
 438 void wxString::Alloc(size_t nLen)
 439 {
 440   wxStringData *pData = GetStringData();
 441   if ( pData->nAllocLength <= nLen ) {
 442     if ( pData->IsEmpty() ) {
 443       nLen += EXTRA_ALLOC;
 444
 445       wxStringData* pData = (wxStringData*)
 446         malloc(sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar));
 447       pData->nRefs = 1;
 448       pData->nDataLength = 0;
 449       pData->nAllocLength = nLen;
 450       m_pchData = pData->data();  // data starts after wxStringData
 451       m_pchData[0u] = wxT('\0');
 452     }
 453     else if ( pData->IsShared() ) {
 454       pData->Unlock();                // memory not freed because shared
 455       size_t nOldLen = pData->nDataLength;
 456       AllocBuffer(nLen);
 457       memcpy(m_pchData, pData->data(), nOldLen*sizeof(wxChar));
 458     }
 459     else {
 460       nLen += EXTRA_ALLOC;
 461
 462       wxStringData *pDataOld = pData;
 463       wxStringData *p = (wxStringData *)
 464         realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar));
 465
 466       if ( p == NULL ) {
 467         // don't leak memory
 468         free(pDataOld);
 469
 470         // FIXME what to do on memory error?
 471         return;
 472       }
 473
 474       // it's not important if the pointer changed or not (the check for this
 475       // is not faster than assigning to m_pchData in all cases)
 476       p->nAllocLength = nLen;
 477       m_pchData = p->data();
 478     }
 479   }
 480   //else: we've already got enough
 481 }
 482
 483 // shrink to minimal size (releasing extra memory)
 484 void wxString::Shrink()
 485 {
 486   wxStringData *pData = GetStringData();
 487
 488   // this variable is unused in release build, so avoid the compiler warning
 489   // by just not declaring it
 490 #ifdef __WXDEBUG__
 491   void *p =
 492 #endif
 493   realloc(pData, sizeof(wxStringData) + (pData->nDataLength + 1)*sizeof(wxChar));
 494
 495   // we rely on a reasonable realloc() implementation here - so far I haven't
 496   // seen any which wouldn't behave like this
 497
 498   wxASSERT( p != NULL );  // can't free memory?
 499   wxASSERT( p == pData ); // we're decrementing the size - block shouldn't move!
 500 }
 501
 502 // get the pointer to writable buffer of (at least) nLen bytes
 503 wxChar *wxString::GetWriteBuf(size_t nLen)
 504 {
 505   AllocBeforeWrite(nLen);
 506
 507   wxASSERT( GetStringData()->nRefs == 1 );
 508   GetStringData()->Validate(FALSE);
 509
 510   return m_pchData;
 511 }
 512
 513 // put string back in a reasonable state after GetWriteBuf
 514 void wxString::UngetWriteBuf()
 515 {
 516   GetStringData()->nDataLength = wxStrlen(m_pchData);
 517   GetStringData()->Validate(TRUE);
 518 }
 519
 520 // ---------------------------------------------------------------------------
 521 // data access
 522 // ---------------------------------------------------------------------------
 523
 524 // all functions are inline in string.h
 525
 526 // ---------------------------------------------------------------------------
 527 // assignment operators
 528 // ---------------------------------------------------------------------------
 529
 530 // helper function: does real copy
 531 void wxString::AssignCopy(size_t nSrcLen, const wxChar *pszSrcData)
 532 {
 533   if ( nSrcLen == 0 ) {
 534     Reinit();
 535   }
 536   else {
 537     AllocBeforeWrite(nSrcLen);
 538     memcpy(m_pchData, pszSrcData, nSrcLen*sizeof(wxChar));
 539     GetStringData()->nDataLength = nSrcLen;
 540     m_pchData[nSrcLen] = wxT('\0');
 541   }
 542 }
 543
 544 // assigns one string to another
 545 wxString& wxString::operator=(const wxString& stringSrc)
 546 {
 547   wxASSERT( stringSrc.GetStringData()->IsValid() );
 548
 549   // don't copy string over itself
 550   if ( m_pchData != stringSrc.m_pchData ) {
 551     if ( stringSrc.GetStringData()->IsEmpty() ) {
 552       Reinit();
 553     }
 554     else {
 555       // adjust references
 556       GetStringData()->Unlock();
 557       m_pchData = stringSrc.m_pchData;
 558       GetStringData()->Lock();
 559     }
 560   }
 561
 562   return *this;
 563 }
 564
 565 // assigns a single character
 566 wxString& wxString::operator=(wxChar ch)
 567 {
 568   AssignCopy(1, &ch);
 569   return *this;
 570 }
 571
 572 // assigns C string
 573 wxString& wxString::operator=(const wxChar *psz)
 574 {
 575   AssignCopy(wxStrlen(psz), psz);
 576   return *this;
 577 }
 578
 579 #if !wxUSE_UNICODE
 580
 581 // same as 'signed char' variant
 582 wxString& wxString::operator=(const unsigned char* psz)
 583 {
 584   *this = (const char *)psz;
 585   return *this;
 586 }
 587
 588 #if wxUSE_WCHAR_T
 589 wxString& wxString::operator=(const wchar_t *pwz)
 590 {
 591   wxString str(pwz);
 592   *this = str;
 593   return *this;
 594 }
 595 #endif
 596
 597 #endif
 598
 599 // ---------------------------------------------------------------------------
 600 // string concatenation
 601 // ---------------------------------------------------------------------------
 602
 603 // add something to this string
 604 void wxString::ConcatSelf(int nSrcLen, const wxChar *pszSrcData)
 605 {
 606   STATISTICS_ADD(SummandLength, nSrcLen);
 607
 608   // concatenating an empty string is a NOP
 609   if ( nSrcLen > 0 ) {
 610     wxStringData *pData = GetStringData();
 611     size_t nLen = pData->nDataLength;
 612     size_t nNewLen = nLen + nSrcLen;
 613
 614     // alloc new buffer if current is too small
 615     if ( pData->IsShared() ) {
 616       STATISTICS_ADD(ConcatHit, 0);
 617
 618       // we have to allocate another buffer
 619       wxStringData* pOldData = GetStringData();
 620       AllocBuffer(nNewLen);
 621       memcpy(m_pchData, pOldData->data(), nLen*sizeof(wxChar));
 622       pOldData->Unlock();
 623     }
 624     else if ( nNewLen > pData->nAllocLength ) {
 625       STATISTICS_ADD(ConcatHit, 0);
 626
 627       // we have to grow the buffer
 628       Alloc(nNewLen);
 629     }
 630     else {
 631       STATISTICS_ADD(ConcatHit, 1);
 632
 633       // the buffer is already big enough
 634     }
 635
 636     // should be enough space
 637     wxASSERT( nNewLen <= GetStringData()->nAllocLength );
 638
 639     // fast concatenation - all is done in our buffer
 640     memcpy(m_pchData + nLen, pszSrcData, nSrcLen*sizeof(wxChar));
 641
 642     m_pchData[nNewLen] = wxT('\0');          // put terminating '\0'
 643     GetStringData()->nDataLength = nNewLen; // and fix the length
 644   }
 645   //else: the string to append was empty
 646 }
 647
 648 /*
 649  * concatenation functions come in 5 flavours:
 650  *  string + string
 651  *  char   + string      and      string + char
 652  *  C str  + string      and      string + C str
 653  */
 654
 655 wxString operator+(const wxString& string1, const wxString& string2)
 656 {
 657   wxASSERT( string1.GetStringData()->IsValid() );
 658   wxASSERT( string2.GetStringData()->IsValid() );
 659
 660   wxString s = string1;
 661   s += string2;
 662
 663   return s;
 664 }
 665
 666 wxString operator+(const wxString& string, wxChar ch)
 667 {
 668   wxASSERT( string.GetStringData()->IsValid() );
 669
 670   wxString s = string;
 671   s += ch;
 672
 673   return s;
 674 }
 675
 676 wxString operator+(wxChar ch, const wxString& string)
 677 {
 678   wxASSERT( string.GetStringData()->IsValid() );
 679
 680   wxString s = ch;
 681   s += string;
 682
 683   return s;
 684 }
 685
 686 wxString operator+(const wxString& string, const wxChar *psz)
 687 {
 688   wxASSERT( string.GetStringData()->IsValid() );
 689
 690   wxString s;
 691   s.Alloc(wxStrlen(psz) + string.Len());
 692   s = string;
 693   s += psz;
 694
 695   return s;
 696 }
 697
 698 wxString operator+(const wxChar *psz, const wxString& string)
 699 {
 700   wxASSERT( string.GetStringData()->IsValid() );
 701
 702   wxString s;
 703   s.Alloc(wxStrlen(psz) + string.Len());
 704   s = psz;
 705   s += string;
 706
 707   return s;
 708 }
 709
 710 // ===========================================================================
 711 // other common string functions
 712 // ===========================================================================
 713
 714 // ---------------------------------------------------------------------------
 715 // simple sub-string extraction
 716 // ---------------------------------------------------------------------------
 717
 718 // helper function: clone the data attached to this string
 719 void wxString::AllocCopy(wxString& dest, int nCopyLen, int nCopyIndex) const
 720 {
 721   if ( nCopyLen == 0 ) {
 722     dest.Init();
 723   }
 724   else {
 725     dest.AllocBuffer(nCopyLen);
 726     memcpy(dest.m_pchData, m_pchData + nCopyIndex, nCopyLen*sizeof(wxChar));
 727   }
 728 }
 729
 730 // extract string of length nCount starting at nFirst
 731 wxString wxString::Mid(size_t nFirst, size_t nCount) const
 732 {
 733   wxStringData *pData = GetStringData();
 734   size_t nLen = pData->nDataLength;
 735
 736   // default value of nCount is wxSTRING_MAXLEN and means "till the end"
 737   if ( nCount == wxSTRING_MAXLEN )
 738   {
 739     nCount = nLen - nFirst;
 740   }
 741
 742   // out-of-bounds requests return sensible things
 743   if ( nFirst + nCount > nLen )
 744   {
 745     nCount = nLen - nFirst;
 746   }
 747
 748   if ( nFirst > nLen )
 749   {
 750     // AllocCopy() will return empty string
 751     nCount = 0;
 752   }
 753
 754   wxString dest;
 755   AllocCopy(dest, nCount, nFirst);
 756
 757   return dest;
 758 }
 759
 760 // extract nCount last (rightmost) characters
 761 wxString wxString::Right(size_t nCount) const
 762 {
 763   if ( nCount > (size_t)GetStringData()->nDataLength )
 764     nCount = GetStringData()->nDataLength;
 765
 766   wxString dest;
 767   AllocCopy(dest, nCount, GetStringData()->nDataLength - nCount);
 768   return dest;
 769 }
 770
 771 // get all characters after the last occurence of ch
 772 // (returns the whole string if ch not found)
 773 wxString wxString::AfterLast(wxChar ch) const
 774 {
 775   wxString str;
 776   int iPos = Find(ch, TRUE);
 777   if ( iPos == wxNOT_FOUND )
 778     str = *this;
 779   else
 780     str = c_str() + iPos + 1;
 781
 782   return str;
 783 }
 784
 785 // extract nCount first (leftmost) characters
 786 wxString wxString::Left(size_t nCount) const
 787 {
 788   if ( nCount > (size_t)GetStringData()->nDataLength )
 789     nCount = GetStringData()->nDataLength;
 790
 791   wxString dest;
 792   AllocCopy(dest, nCount, 0);
 793   return dest;
 794 }
 795
 796 // get all characters before the first occurence of ch
 797 // (returns the whole string if ch not found)
 798 wxString wxString::BeforeFirst(wxChar ch) const
 799 {
 800   wxString str;
 801   for ( const wxChar *pc = m_pchData; *pc != wxT('\0') && *pc != ch; pc++ )
 802     str += *pc;
 803
 804   return str;
 805 }
 806
 807 /// get all characters before the last occurence of ch
 808 /// (returns empty string if ch not found)
 809 wxString wxString::BeforeLast(wxChar ch) const
 810 {
 811   wxString str;
 812   int iPos = Find(ch, TRUE);
 813   if ( iPos != wxNOT_FOUND && iPos != 0 )
 814     str = wxString(c_str(), iPos);
 815
 816   return str;
 817 }
 818
 819 /// get all characters after the first occurence of ch
 820 /// (returns empty string if ch not found)
 821 wxString wxString::AfterFirst(wxChar ch) const
 822 {
 823   wxString str;
 824   int iPos = Find(ch);
 825   if ( iPos != wxNOT_FOUND )
 826     str = c_str() + iPos + 1;
 827
 828   return str;
 829 }
 830
 831 // replace first (or all) occurences of some substring with another one
 832 size_t wxString::Replace(const wxChar *szOld, const wxChar *szNew, bool bReplaceAll)
 833 {
 834   size_t uiCount = 0;   // count of replacements made
 835
 836   size_t uiOldLen = wxStrlen(szOld);
 837
 838   wxString strTemp;
 839   const wxChar *pCurrent = m_pchData;
 840   const wxChar *pSubstr;
 841   while ( *pCurrent != wxT('\0') ) {
 842     pSubstr = wxStrstr(pCurrent, szOld);
 843     if ( pSubstr == NULL ) {
 844       // strTemp is unused if no replacements were made, so avoid the copy
 845       if ( uiCount == 0 )
 846         return 0;
 847
 848       strTemp += pCurrent;    // copy the rest
 849       break;                  // exit the loop
 850     }
 851     else {
 852       // take chars before match
 853       strTemp.ConcatSelf(pSubstr - pCurrent, pCurrent);
 854       strTemp += szNew;
 855       pCurrent = pSubstr + uiOldLen;  // restart after match
 856
 857       uiCount++;
 858
 859       // stop now?
 860       if ( !bReplaceAll ) {
 861         strTemp += pCurrent;    // copy the rest
 862         break;                  // exit the loop
 863       }
 864     }
 865   }
 866
 867   // only done if there were replacements, otherwise would have returned above
 868   *this = strTemp;
 869
 870   return uiCount;
 871 }
 872
 873 bool wxString::IsAscii() const
 874 {
 875   const wxChar *s = (const wxChar*) *this;
 876   while(*s){
 877     if(!isascii(*s)) return(FALSE);
 878     s++;
 879   }
 880   return(TRUE);
 881 }
 882
 883 bool wxString::IsWord() const
 884 {
 885   const wxChar *s = (const wxChar*) *this;
 886   while(*s){
 887     if(!wxIsalpha(*s)) return(FALSE);
 888     s++;
 889   }
 890   return(TRUE);
 891 }
 892
 893 bool wxString::IsNumber() const
 894 {
 895   const wxChar *s = (const wxChar*) *this;
 896   while(*s){
 897     if(!wxIsdigit(*s)) return(FALSE);
 898     s++;
 899   }
 900   return(TRUE);
 901 }
 902
 903 wxString wxString::Strip(stripType w) const
 904 {
 905     wxString s = *this;
 906     if ( w & leading ) s.Trim(FALSE);
 907     if ( w & trailing ) s.Trim(TRUE);
 908     return s;
 909 }
 910
 911 // ---------------------------------------------------------------------------
 912 // case conversion
 913 // ---------------------------------------------------------------------------
 914
 915 wxString& wxString::MakeUpper()
 916 {
 917   CopyBeforeWrite();
 918
 919   for ( wxChar *p = m_pchData; *p; p++ )
 920     *p = (wxChar)wxToupper(*p);
 921
 922   return *this;
 923 }
 924
 925 wxString& wxString::MakeLower()
 926 {
 927   CopyBeforeWrite();
 928
 929   for ( wxChar *p = m_pchData; *p; p++ )
 930     *p = (wxChar)wxTolower(*p);
 931
 932   return *this;
 933 }
 934
 935 // ---------------------------------------------------------------------------
 936 // trimming and padding
 937 // ---------------------------------------------------------------------------
 938
 939 // trims spaces (in the sense of isspace) from left or right side
 940 wxString& wxString::Trim(bool bFromRight)
 941 {
 942   // first check if we're going to modify the string at all
 943   if ( !IsEmpty() &&
 944        (
 945         (bFromRight && wxIsspace(GetChar(Len() - 1))) ||
 946         (!bFromRight && wxIsspace(GetChar(0u)))
 947        )
 948      )
 949   {
 950     // ok, there is at least one space to trim
 951     CopyBeforeWrite();
 952
 953     if ( bFromRight )
 954     {
 955       // find last non-space character
 956       wxChar *psz = m_pchData + GetStringData()->nDataLength - 1;
 957       while ( wxIsspace(*psz) && (psz >= m_pchData) )
 958         psz--;
 959
 960       // truncate at trailing space start
 961       *++psz = wxT('\0');
 962       GetStringData()->nDataLength = psz - m_pchData;
 963     }
 964     else
 965     {
 966       // find first non-space character
 967       const wxChar *psz = m_pchData;
 968       while ( wxIsspace(*psz) )
 969         psz++;
 970
 971       // fix up data and length
 972       int nDataLength = GetStringData()->nDataLength - (psz - (const wxChar*) m_pchData);
 973       memmove(m_pchData, psz, (nDataLength + 1)*sizeof(wxChar));
 974       GetStringData()->nDataLength = nDataLength;
 975     }
 976   }
 977
 978   return *this;
 979 }
 980
 981 // adds nCount characters chPad to the string from either side
 982 wxString& wxString::Pad(size_t nCount, wxChar chPad, bool bFromRight)
 983 {
 984   wxString s(chPad, nCount);
 985
 986   if ( bFromRight )
 987     *this += s;
 988   else
 989   {
 990     s += *this;
 991     *this = s;
 992   }
 993
 994   return *this;
 995 }
 996
 997 // truncate the string
 998 wxString& wxString::Truncate(size_t uiLen)
 999 {
1000   if ( uiLen < Len() ) {
1001     CopyBeforeWrite();
1002
1003     *(m_pchData + uiLen) = wxT('\0');
1004     GetStringData()->nDataLength = uiLen;
1005   }
1006   //else: nothing to do, string is already short enough
1007
1008   return *this;
1009 }
1010
1011 // ---------------------------------------------------------------------------
1012 // finding (return wxNOT_FOUND if not found and index otherwise)
1013 // ---------------------------------------------------------------------------
1014
1015 // find a character
1016 int wxString::Find(wxChar ch, bool bFromEnd) const
1017 {
1018   const wxChar *psz = bFromEnd ? wxStrrchr(m_pchData, ch) : wxStrchr(m_pchData, ch);
1019
1020   return (psz == NULL) ? wxNOT_FOUND : psz - (const wxChar*) m_pchData;
1021 }
1022
1023 // find a sub-string (like strstr)
1024 int wxString::Find(const wxChar *pszSub) const
1025 {
1026   const wxChar *psz = wxStrstr(m_pchData, pszSub);
1027
1028   return (psz == NULL) ? wxNOT_FOUND : psz - (const wxChar*) m_pchData;
1029 }
1030
1031 // ----------------------------------------------------------------------------
1032 // conversion to numbers
1033 // ----------------------------------------------------------------------------
1034
1035 bool wxString::ToLong(long *val) const
1036 {
1037     wxCHECK_MSG( val, FALSE, _T("NULL pointer in wxString::ToLong") );
1038
1039     const wxChar *start = c_str();
1040     wxChar *end;
1041     *val = wxStrtol(start, &end, 10);
1042
1043     // return TRUE only if scan was stopped by the terminating NUL and if the
1044     // string was not empty to start with
1045     return !*end && (end != start);
1046 }
1047
1048 bool wxString::ToULong(unsigned long *val) const
1049 {
1050     wxCHECK_MSG( val, FALSE, _T("NULL pointer in wxString::ToULong") );
1051
1052     const wxChar *start = c_str();
1053     wxChar *end;
1054     *val = wxStrtoul(start, &end, 10);
1055
1056     // return TRUE only if scan was stopped by the terminating NUL and if the
1057     // string was not empty to start with
1058     return !*end && (end != start);
1059 }
1060
1061 bool wxString::ToDouble(double *val) const
1062 {
1063     wxCHECK_MSG( val, FALSE, _T("NULL pointer in wxString::ToDouble") );
1064
1065     const wxChar *start = c_str();
1066     wxChar *end;
1067     *val = wxStrtod(start, &end);
1068
1069     // return TRUE only if scan was stopped by the terminating NUL and if the
1070     // string was not empty to start with
1071     return !*end && (end != start);
1072 }
1073
1074 // ---------------------------------------------------------------------------
1075 // stream-like operators
1076 // ---------------------------------------------------------------------------
1077 wxString& wxString::operator<<(int i)
1078 {
1079     wxString res;
1080     res.Printf(wxT("%d"), i);
1081
1082     return (*this) << res;
1083 }
1084
1085 wxString& wxString::operator<<(float f)
1086 {
1087     wxString res;
1088     res.Printf(wxT("%f"), f);
1089
1090     return (*this) << res;
1091 }
1092
1093 wxString& wxString::operator<<(double d)
1094 {
1095     wxString res;
1096     res.Printf(wxT("%g"), d);
1097
1098     return (*this) << res;
1099 }
1100
1101 // ---------------------------------------------------------------------------
1102 // formatted output
1103 // ---------------------------------------------------------------------------
1104
1105 /* static */
1106 wxString wxString::Format(const wxChar *pszFormat, ...)
1107 {
1108     va_list argptr;
1109     va_start(argptr, pszFormat);
1110
1111     wxString s;
1112     s.PrintfV(pszFormat, argptr);
1113
1114     va_end(argptr);
1115
1116     return s;
1117 }
1118
1119 /* static */
1120 wxString wxString::FormatV(const wxChar *pszFormat, va_list argptr)
1121 {
1122     wxString s;
1123     s.Printf(pszFormat, argptr);
1124     return s;
1125 }
1126
1127 int wxString::Printf(const wxChar *pszFormat, ...)
1128 {
1129   va_list argptr;
1130   va_start(argptr, pszFormat);
1131
1132   int iLen = PrintfV(pszFormat, argptr);
1133
1134   va_end(argptr);
1135
1136   return iLen;
1137 }
1138
1139 int wxString::PrintfV(const wxChar* pszFormat, va_list argptr)
1140 {
1141 #if wxUSE_EXPERIMENTAL_PRINTF
1142   // the new implementation
1143
1144   // buffer to avoid dynamic memory allocation each time for small strings
1145   char szScratch[1024];
1146
1147   Reinit();
1148   for (size_t n = 0; pszFormat[n]; n++)
1149     if (pszFormat[n] == wxT('%')) {
1150       static char s_szFlags[256] = "%";
1151       size_t flagofs = 1;
1152       bool adj_left = FALSE, in_prec = FALSE,
1153            prec_dot = FALSE, done = FALSE;
1154       int ilen = 0;
1155       size_t min_width = 0, max_width = wxSTRING_MAXLEN;
1156       do {
1157 #define CHECK_PREC if (in_prec && !prec_dot) { s_szFlags[flagofs++] = '.'; prec_dot = TRUE; }
1158         switch (pszFormat[++n]) {
1159         case wxT('\0'):
1160           done = TRUE;
1161           break;
1162         case wxT('%'):
1163           *this += wxT('%');
1164           done = TRUE;
1165           break;
1166         case wxT('#'):
1167         case wxT('0'):
1168         case wxT(' '):
1169         case wxT('+'):
1170         case wxT('\''):
1171           CHECK_PREC
1172           s_szFlags[flagofs++] = pszFormat[n];
1173           break;
1174         case wxT('-'):
1175           CHECK_PREC
1176           adj_left = TRUE;
1177           s_szFlags[flagofs++] = pszFormat[n];
1178           break;
1179         case wxT('.'):
1180           CHECK_PREC
1181           in_prec = TRUE;
1182           prec_dot = FALSE;
1183           max_width = 0;
1184           // dot will be auto-added to s_szFlags if non-negative number follows
1185           break;
1186         case wxT('h'):
1187           ilen = -1;
1188           CHECK_PREC
1189           s_szFlags[flagofs++] = pszFormat[n];
1190           break;
1191         case wxT('l'):
1192           ilen = 1;
1193           CHECK_PREC
1194           s_szFlags[flagofs++] = pszFormat[n];
1195           break;
1196         case wxT('q'):
1197         case wxT('L'):
1198           ilen = 2;
1199           CHECK_PREC
1200           s_szFlags[flagofs++] = pszFormat[n];
1201           break;
1202         case wxT('Z'):
1203           ilen = 3;
1204           CHECK_PREC
1205           s_szFlags[flagofs++] = pszFormat[n];
1206           break;
1207         case wxT('*'):
1208           {
1209             int len = va_arg(argptr, int);
1210             if (in_prec) {
1211               if (len<0) break;
1212               CHECK_PREC
1213               max_width = len;
1214             } else {
1215               if (len<0) {
1216                 adj_left = !adj_left;
1217                 s_szFlags[flagofs++] = '-';
1218                 len = -len;
1219               }
1220               min_width = len;
1221             }
1222             flagofs += ::sprintf(s_szFlags+flagofs,"%d",len);
1223           }
1224           break;
1225         case wxT('1'): case wxT('2'): case wxT('3'):
1226         case wxT('4'): case wxT('5'): case wxT('6'):
1227         case wxT('7'): case wxT('8'): case wxT('9'):
1228           {
1229             int len = 0;
1230             CHECK_PREC
1231             while ((pszFormat[n]>=wxT('0')) && (pszFormat[n]<=wxT('9'))) {
1232               s_szFlags[flagofs++] = pszFormat[n];
1233               len = len*10 + (pszFormat[n] - wxT('0'));
1234               n++;
1235             }
1236             if (in_prec) max_width = len;
1237             else min_width = len;
1238             n--; // the main loop pre-increments n again
1239           }
1240           break;
1241         case wxT('d'):
1242         case wxT('i'):
1243         case wxT('o'):
1244         case wxT('u'):
1245         case wxT('x'):
1246         case wxT('X'):
1247           CHECK_PREC
1248           s_szFlags[flagofs++] = pszFormat[n];
1249           s_szFlags[flagofs] = '\0';
1250           if (ilen == 0 ) {
1251             int val = va_arg(argptr, int);
1252             ::sprintf(szScratch, s_szFlags, val);
1253           }
1254           else if (ilen == -1) {
1255             short int val = va_arg(argptr, short int);
1256             ::sprintf(szScratch, s_szFlags, val);
1257           }
1258           else if (ilen == 1) {
1259             long int val = va_arg(argptr, long int);
1260             ::sprintf(szScratch, s_szFlags, val);
1261           }
1262           else if (ilen == 2) {
1263 #if SIZEOF_LONG_LONG
1264             long long int val = va_arg(argptr, long long int);
1265             ::sprintf(szScratch, s_szFlags, val);
1266 #else
1267             long int val = va_arg(argptr, long int);
1268             ::sprintf(szScratch, s_szFlags, val);
1269 #endif
1270           }
1271           else if (ilen == 3) {
1272             size_t val = va_arg(argptr, size_t);
1273             ::sprintf(szScratch, s_szFlags, val);
1274           }
1275           *this += wxString(szScratch);
1276           done = TRUE;
1277           break;
1278         case wxT('e'):
1279         case wxT('E'):
1280         case wxT('f'):
1281         case wxT('g'):
1282         case wxT('G'):
1283           CHECK_PREC
1284           s_szFlags[flagofs++] = pszFormat[n];
1285           s_szFlags[flagofs] = '\0';
1286           if (ilen == 2) {
1287             long double val = va_arg(argptr, long double);
1288             ::sprintf(szScratch, s_szFlags, val);
1289           } else {
1290             double val = va_arg(argptr, double);
1291             ::sprintf(szScratch, s_szFlags, val);
1292           }
1293           *this += wxString(szScratch);
1294           done = TRUE;
1295           break;
1296         case wxT('p'):
1297           {
1298             void *val = va_arg(argptr, void *);
1299             CHECK_PREC
1300             s_szFlags[flagofs++] = pszFormat[n];
1301             s_szFlags[flagofs] = '\0';
1302             ::sprintf(szScratch, s_szFlags, val);
1303             *this += wxString(szScratch);
1304             done = TRUE;
1305           }
1306           break;
1307         case wxT('c'):
1308           {
1309             wxChar val = va_arg(argptr, int);
1310             // we don't need to honor padding here, do we?
1311             *this += val;
1312             done = TRUE;
1313           }
1314           break;
1315         case wxT('s'):
1316           if (ilen == -1) {
1317             // wx extension: we'll let %hs mean non-Unicode strings
1318             char *val = va_arg(argptr, char *);
1319 #if wxUSE_UNICODE
1320             // ASCII->Unicode constructor handles max_width right
1321             wxString s(val, wxConvLibc, max_width);
1322 #else
1323             size_t len = wxSTRING_MAXLEN;
1324             if (val) {
1325               for (len = 0; val[len] && (len<max_width); len++);
1326             } else val = wxT("(null)");
1327             wxString s(val, len);
1328 #endif
1329             if (s.Len() < min_width)
1330               s.Pad(min_width - s.Len(), wxT(' '), adj_left);
1331             *this += s;
1332           } else {
1333             wxChar *val = va_arg(argptr, wxChar *);
1334             size_t len = wxSTRING_MAXLEN;
1335             if (val) {
1336               for (len = 0; val[len] && (len<max_width); len++);
1337             } else val = wxT("(null)");
1338             wxString s(val, len);
1339             if (s.Len() < min_width)
1340               s.Pad(min_width - s.Len(), wxT(' '), adj_left);
1341             *this += s;
1342           }
1343           done = TRUE;
1344           break;
1345         case wxT('n'):
1346           if (ilen == 0) {
1347             int *val = va_arg(argptr, int *);
1348             *val = Len();
1349           }
1350           else if (ilen == -1) {
1351             short int *val = va_arg(argptr, short int *);
1352             *val = Len();
1353           }
1354           else if (ilen >= 1) {
1355             long int *val = va_arg(argptr, long int *);
1356             *val = Len();
1357           }
1358           done = TRUE;
1359           break;
1360         default:
1361           if (wxIsalpha(pszFormat[n]))
1362             // probably some flag not taken care of here yet
1363             s_szFlags[flagofs++] = pszFormat[n];
1364           else {
1365             // bad format
1366             *this += wxT('%'); // just to pass the glibc tst-printf.c
1367             n--;
1368             done = TRUE;
1369           }
1370           break;
1371         }
1372 #undef CHECK_PREC
1373       } while (!done);
1374     } else *this += pszFormat[n];
1375
1376 #else
1377   // buffer to avoid dynamic memory allocation each time for small strings
1378   char szScratch[1024];
1379
1380   // NB: wxVsnprintf() may return either less than the buffer size or -1 if
1381   //     there is not enough place depending on implementation
1382   int iLen = wxVsnprintfA(szScratch, WXSIZEOF(szScratch), pszFormat, argptr);
1383   if ( iLen != -1 ) {
1384     // the whole string is in szScratch
1385     *this = szScratch;
1386   }
1387   else {
1388       bool outOfMemory = FALSE;
1389       int size = 2*WXSIZEOF(szScratch);
1390       while ( !outOfMemory ) {
1391           char *buf = GetWriteBuf(size);
1392           if ( buf )
1393             iLen = wxVsnprintfA(buf, size, pszFormat, argptr);
1394           else
1395             outOfMemory = TRUE;
1396
1397           UngetWriteBuf();
1398
1399           if ( iLen != -1 ) {
1400               // ok, there was enough space
1401               break;
1402           }
1403
1404           // still not enough, double it again
1405           size *= 2;
1406       }
1407
1408       if ( outOfMemory ) {
1409           // out of memory
1410           return -1;
1411       }
1412   }
1413 #endif // wxUSE_EXPERIMENTAL_PRINTF/!wxUSE_EXPERIMENTAL_PRINTF
1414
1415   return Len();
1416 }
1417
1418 // ----------------------------------------------------------------------------
1419 // misc other operations
1420 // ----------------------------------------------------------------------------
1421
1422 // returns TRUE if the string matches the pattern which may contain '*' and
1423 // '?' metacharacters (as usual, '?' matches any character and '*' any number
1424 // of them)
1425 bool wxString::Matches(const wxChar *pszMask) const
1426 {
1427   // check char by char
1428   const wxChar *pszTxt;
1429   for ( pszTxt = c_str(); *pszMask != wxT('\0'); pszMask++, pszTxt++ ) {
1430     switch ( *pszMask ) {
1431       case wxT('?'):
1432         if ( *pszTxt == wxT('\0') )
1433           return FALSE;
1434
1435         // pszText and pszMask will be incremented in the loop statement
1436
1437         break;
1438
1439       case wxT('*'):
1440         {
1441           // ignore special chars immediately following this one
1442           while ( *pszMask == wxT('*') || *pszMask == wxT('?') )
1443             pszMask++;
1444
1445           // if there is nothing more, match
1446           if ( *pszMask == wxT('\0') )
1447             return TRUE;
1448
1449           // are there any other metacharacters in the mask?
1450           size_t uiLenMask;
1451           const wxChar *pEndMask = wxStrpbrk(pszMask, wxT("*?"));
1452
1453           if ( pEndMask != NULL ) {
1454             // we have to match the string between two metachars
1455             uiLenMask = pEndMask - pszMask;
1456           }
1457           else {
1458             // we have to match the remainder of the string
1459             uiLenMask = wxStrlen(pszMask);
1460           }
1461
1462           wxString strToMatch(pszMask, uiLenMask);
1463           const wxChar* pMatch = wxStrstr(pszTxt, strToMatch);
1464           if ( pMatch == NULL )
1465             return FALSE;
1466
1467           // -1 to compensate "++" in the loop
1468           pszTxt = pMatch + uiLenMask - 1;
1469           pszMask += uiLenMask - 1;
1470         }
1471         break;
1472
1473       default:
1474         if ( *pszMask != *pszTxt )
1475           return FALSE;
1476         break;
1477     }
1478   }
1479
1480   // match only if nothing left
1481   return *pszTxt == wxT('\0');
1482 }
1483
1484 // Count the number of chars
1485 int wxString::Freq(wxChar ch) const
1486 {
1487     int count = 0;
1488     int len = Len();
1489     for (int i = 0; i < len; i++)
1490     {
1491         if (GetChar(i) == ch)
1492             count ++;
1493     }
1494     return count;
1495 }
1496
1497 // convert to upper case, return the copy of the string
1498 wxString wxString::Upper() const
1499 { wxString s(*this); return s.MakeUpper(); }
1500
1501 // convert to lower case, return the copy of the string
1502 wxString wxString::Lower() const { wxString s(*this); return s.MakeLower(); }
1503
1504 int wxString::sprintf(const wxChar *pszFormat, ...)
1505   {
1506     va_list argptr;
1507     va_start(argptr, pszFormat);
1508     int iLen = PrintfV(pszFormat, argptr);
1509     va_end(argptr);
1510     return iLen;
1511   }
1512
1513 // ---------------------------------------------------------------------------
1514 // standard C++ library string functions
1515 // ---------------------------------------------------------------------------
1516 #ifdef  wxSTD_STRING_COMPATIBILITY
1517
1518 wxString& wxString::insert(size_t nPos, const wxString& str)
1519 {
1520   wxASSERT( str.GetStringData()->IsValid() );
1521   wxASSERT( nPos <= Len() );
1522
1523   if ( !str.IsEmpty() ) {
1524     wxString strTmp;
1525     wxChar *pc = strTmp.GetWriteBuf(Len() + str.Len());
1526     wxStrncpy(pc, c_str(), nPos);
1527     wxStrcpy(pc + nPos, str);
1528     wxStrcpy(pc + nPos + str.Len(), c_str() + nPos);
1529     strTmp.UngetWriteBuf();
1530     *this = strTmp;
1531   }
1532
1533   return *this;
1534 }
1535
1536 size_t wxString::find(const wxString& str, size_t nStart) const
1537 {
1538   wxASSERT( str.GetStringData()->IsValid() );
1539   wxASSERT( nStart <= Len() );
1540
1541   const wxChar *p = wxStrstr(c_str() + nStart, str);
1542
1543   return p == NULL ? npos : p - c_str();
1544 }
1545
1546 // VC++ 1.5 can't cope with the default argument in the header.
1547 #if !defined(__VISUALC__) || defined(__WIN32__)
1548 size_t wxString::find(const wxChar* sz, size_t nStart, size_t n) const
1549 {
1550   return find(wxString(sz, n == npos ? 0 : n), nStart);
1551 }
1552 #endif // VC++ 1.5
1553
1554 // Gives a duplicate symbol (presumably a case-insensitivity problem)
1555 #if !defined(__BORLANDC__)
1556 size_t wxString::find(wxChar ch, size_t nStart) const
1557 {
1558   wxASSERT( nStart <= Len() );
1559
1560   const wxChar *p = wxStrchr(c_str() + nStart, ch);
1561
1562   return p == NULL ? npos : p - c_str();
1563 }
1564 #endif
1565
1566 size_t wxString::rfind(const wxString& str, size_t nStart) const
1567 {
1568   wxASSERT( str.GetStringData()->IsValid() );
1569   wxASSERT( nStart <= Len() );
1570
1571   // TODO could be made much quicker than that
1572   const wxChar *p = c_str() + (nStart == npos ? Len() : nStart);
1573   while ( p >= c_str() + str.Len() ) {
1574     if ( wxStrncmp(p - str.Len(), str, str.Len()) == 0 )
1575       return p - str.Len() - c_str();
1576     p--;
1577   }
1578
1579   return npos;
1580 }
1581
1582 // VC++ 1.5 can't cope with the default argument in the header.
1583 #if !defined(__VISUALC__) || defined(__WIN32__)
1584 size_t wxString::rfind(const wxChar* sz, size_t nStart, size_t n) const
1585 {
1586     return rfind(wxString(sz, n == npos ? 0 : n), nStart);
1587 }
1588
1589 size_t wxString::rfind(wxChar ch, size_t nStart) const
1590 {
1591     if ( nStart == npos )
1592     {
1593         nStart = Len();
1594     }
1595     else
1596     {
1597         wxASSERT( nStart <= Len() );
1598     }
1599
1600     const wxChar *p = wxStrrchr(c_str(), ch);
1601
1602     if ( p == NULL )
1603         return npos;
1604
1605     size_t result = p - c_str();
1606     return ( result > nStart ) ? npos : result;
1607 }
1608 #endif // VC++ 1.5
1609
1610 size_t wxString::find_first_of(const wxChar* sz, size_t nStart) const
1611 {
1612     const wxChar *start = c_str() + nStart;
1613     const wxChar *firstOf = wxStrpbrk(start, sz);
1614     if ( firstOf )
1615         return firstOf - start;
1616     else
1617         return npos;
1618 }
1619
1620 size_t wxString::find_last_of(const wxChar* sz, size_t nStart) const
1621 {
1622     if ( nStart == npos )
1623     {
1624         nStart = Len();
1625     }
1626     else
1627     {
1628         wxASSERT( nStart <= Len() );
1629     }
1630
1631     for ( const wxChar *p = c_str() + length() - 1; p >= c_str(); p-- )
1632     {
1633         if ( wxStrchr(sz, *p) )
1634             return p - c_str();
1635     }
1636
1637     return npos;
1638 }
1639
1640 size_t wxString::find_first_not_of(const wxChar* sz, size_t nStart) const
1641 {
1642     if ( nStart == npos )
1643     {
1644         nStart = Len();
1645     }
1646     else
1647     {
1648         wxASSERT( nStart <= Len() );
1649     }
1650
1651     size_t nAccept = wxStrspn(c_str() + nStart, sz);
1652     if ( nAccept >= length() - nStart )
1653         return npos;
1654     else
1655         return nAccept;
1656 }
1657
1658 size_t wxString::find_first_not_of(wxChar ch, size_t nStart) const
1659 {
1660     wxASSERT( nStart <= Len() );
1661
1662     for ( const wxChar *p = c_str() + nStart; *p; p++ )
1663     {
1664         if ( *p != ch )
1665             return p - c_str();
1666     }
1667
1668     return npos;
1669 }
1670
1671 size_t wxString::find_last_not_of(const wxChar* sz, size_t nStart) const
1672 {
1673     if ( nStart == npos )
1674     {
1675         nStart = Len();
1676     }
1677     else
1678     {
1679         wxASSERT( nStart <= Len() );
1680     }
1681
1682     for ( const wxChar *p = c_str() + nStart - 1; p >= c_str(); p-- )
1683     {
1684         if ( !wxStrchr(sz, *p) )
1685             return p - c_str();
1686     }
1687
1688     return npos;
1689 }
1690
1691 size_t wxString::find_last_not_of(wxChar ch, size_t nStart) const
1692 {
1693     if ( nStart == npos )
1694     {
1695         nStart = Len();
1696     }
1697     else
1698     {
1699         wxASSERT( nStart <= Len() );
1700     }
1701
1702     for ( const wxChar *p = c_str() + nStart - 1; p >= c_str(); p-- )
1703     {
1704         if ( *p != ch )
1705             return p - c_str();
1706     }
1707
1708     return npos;
1709 }
1710
1711 wxString& wxString::erase(size_t nStart, size_t nLen)
1712 {
1713   wxString strTmp(c_str(), nStart);
1714   if ( nLen != npos ) {
1715     wxASSERT( nStart + nLen <= Len() );
1716
1717     strTmp.append(c_str() + nStart + nLen);
1718   }
1719
1720   *this = strTmp;
1721   return *this;
1722 }
1723
1724 wxString& wxString::replace(size_t nStart, size_t nLen, const wxChar *sz)
1725 {
1726   wxASSERT( nStart + nLen <= wxStrlen(sz) );
1727
1728   wxString strTmp;
1729   if ( nStart != 0 )
1730     strTmp.append(c_str(), nStart);
1731   strTmp += sz;
1732   strTmp.append(c_str() + nStart + nLen);
1733
1734   *this = strTmp;
1735   return *this;
1736 }
1737
1738 wxString& wxString::replace(size_t nStart, size_t nLen, size_t nCount, wxChar ch)
1739 {
1740   return replace(nStart, nLen, wxString(ch, nCount));
1741 }
1742
1743 wxString& wxString::replace(size_t nStart, size_t nLen,
1744                             const wxString& str, size_t nStart2, size_t nLen2)
1745 {
1746   return replace(nStart, nLen, str.substr(nStart2, nLen2));
1747 }
1748
1749 wxString& wxString::replace(size_t nStart, size_t nLen,
1750                         const wxChar* sz, size_t nCount)
1751 {
1752   return replace(nStart, nLen, wxString(sz, nCount));
1753 }
1754
1755 #endif  //std::string compatibility
1756
1757 // ============================================================================
1758 // ArrayString
1759 // ============================================================================
1760
1761 // size increment = max(50% of current size, ARRAY_MAXSIZE_INCREMENT)
1762 #define   ARRAY_MAXSIZE_INCREMENT       4096
1763 #ifndef   ARRAY_DEFAULT_INITIAL_SIZE    // also defined in dynarray.h
1764   #define   ARRAY_DEFAULT_INITIAL_SIZE    (16)
1765 #endif
1766
1767 #define   STRING(p)   ((wxString *)(&(p)))
1768
1769 // ctor
1770 wxArrayString::wxArrayString(bool autoSort)
1771 {
1772   m_nSize  =
1773   m_nCount = 0;
1774   m_pItems = (wxChar **) NULL;
1775   m_autoSort = autoSort;
1776 }
1777
1778 // copy ctor
1779 wxArrayString::wxArrayString(const wxArrayString& src)
1780 {
1781   m_nSize  =
1782   m_nCount = 0;
1783   m_pItems = (wxChar **) NULL;
1784   m_autoSort = src.m_autoSort;
1785
1786   *this = src;
1787 }
1788
1789 // assignment operator
1790 wxArrayString& wxArrayString::operator=(const wxArrayString& src)
1791 {
1792   if ( m_nSize > 0 )
1793     Clear();
1794
1795   Copy(src);
1796
1797   return *this;
1798 }
1799
1800 void wxArrayString::Copy(const wxArrayString& src)
1801 {
1802   if ( src.m_nCount > ARRAY_DEFAULT_INITIAL_SIZE )
1803     Alloc(src.m_nCount);
1804
1805   for ( size_t n = 0; n < src.m_nCount; n++ )
1806     Add(src[n]);
1807 }
1808
1809 // grow the array
1810 void wxArrayString::Grow()
1811 {
1812   // only do it if no more place
1813   if( m_nCount == m_nSize ) {
1814     if( m_nSize == 0 ) {
1815       // was empty, alloc some memory
1816       m_nSize = ARRAY_DEFAULT_INITIAL_SIZE;
1817       m_pItems = new wxChar *[m_nSize];
1818     }
1819     else {
1820       // otherwise when it's called for the first time, nIncrement would be 0
1821       // and the array would never be expanded
1822 #if defined(__VISAGECPP__) && defined(__WXDEBUG__)
1823       int array_size = ARRAY_DEFAULT_INITIAL_SIZE;
1824       wxASSERT( array_size != 0 );
1825 #else
1826       wxASSERT( ARRAY_DEFAULT_INITIAL_SIZE != 0 );
1827 #endif
1828
1829       // add 50% but not too much
1830       size_t nIncrement = m_nSize < ARRAY_DEFAULT_INITIAL_SIZE
1831                           ? ARRAY_DEFAULT_INITIAL_SIZE : m_nSize >> 1;
1832       if ( nIncrement > ARRAY_MAXSIZE_INCREMENT )
1833         nIncrement = ARRAY_MAXSIZE_INCREMENT;
1834       m_nSize += nIncrement;
1835       wxChar **pNew = new wxChar *[m_nSize];
1836
1837       // copy data to new location
1838       memcpy(pNew, m_pItems, m_nCount*sizeof(wxChar *));
1839
1840       // delete old memory (but do not release the strings!)
1841       wxDELETEA(m_pItems);
1842
1843       m_pItems = pNew;
1844     }
1845   }
1846 }
1847
1848 void wxArrayString::Free()
1849 {
1850   for ( size_t n = 0; n < m_nCount; n++ ) {
1851     STRING(m_pItems[n])->GetStringData()->Unlock();
1852   }
1853 }
1854
1855 // deletes all the strings from the list
1856 void wxArrayString::Empty()
1857 {
1858   Free();
1859
1860   m_nCount = 0;
1861 }
1862
1863 // as Empty, but also frees memory
1864 void wxArrayString::Clear()
1865 {
1866   Free();
1867
1868   m_nSize  =
1869   m_nCount = 0;
1870
1871   wxDELETEA(m_pItems);
1872 }
1873
1874 // dtor
1875 wxArrayString::~wxArrayString()
1876 {
1877   Free();
1878
1879   wxDELETEA(m_pItems);
1880 }
1881
1882 // pre-allocates memory (frees the previous data!)
1883 void wxArrayString::Alloc(size_t nSize)
1884 {
1885   wxASSERT( nSize > 0 );
1886
1887   // only if old buffer was not big enough
1888   if ( nSize > m_nSize ) {
1889     Free();
1890     wxDELETEA(m_pItems);
1891     m_pItems = new wxChar *[nSize];
1892     m_nSize  = nSize;
1893   }
1894
1895   m_nCount = 0;
1896 }
1897
1898 // minimizes the memory usage by freeing unused memory
1899 void wxArrayString::Shrink()
1900 {
1901   // only do it if we have some memory to free
1902   if( m_nCount < m_nSize ) {
1903     // allocates exactly as much memory as we need
1904     wxChar **pNew = new wxChar *[m_nCount];
1905
1906     // copy data to new location
1907     memcpy(pNew, m_pItems, m_nCount*sizeof(wxChar *));
1908     delete [] m_pItems;
1909     m_pItems = pNew;
1910   }
1911 }
1912
1913 // searches the array for an item (forward or backwards)
1914 int wxArrayString::Index(const wxChar *sz, bool bCase, bool bFromEnd) const
1915 {
1916   if ( m_autoSort ) {
1917     // use binary search in the sorted array
1918     wxASSERT_MSG( bCase && !bFromEnd,
1919                   wxT("search parameters ignored for auto sorted array") );
1920
1921     size_t i,
1922            lo = 0,
1923            hi = m_nCount;
1924     int res;
1925     while ( lo < hi ) {
1926       i = (lo + hi)/2;
1927
1928       res = wxStrcmp(sz, m_pItems[i]);
1929       if ( res < 0 )
1930         hi = i;
1931       else if ( res > 0 )
1932         lo = i + 1;
1933       else
1934         return i;
1935     }
1936
1937     return wxNOT_FOUND;
1938   }
1939   else {
1940     // use linear search in unsorted array
1941     if ( bFromEnd ) {
1942       if ( m_nCount > 0 ) {
1943         size_t ui = m_nCount;
1944         do {
1945           if ( STRING(m_pItems[--ui])->IsSameAs(sz, bCase) )
1946             return ui;
1947         }
1948         while ( ui != 0 );
1949       }
1950     }
1951     else {
1952       for( size_t ui = 0; ui < m_nCount; ui++ ) {
1953         if( STRING(m_pItems[ui])->IsSameAs(sz, bCase) )
1954           return ui;
1955       }
1956     }
1957   }
1958
1959   return wxNOT_FOUND;
1960 }
1961
1962 // add item at the end
1963 size_t wxArrayString::Add(const wxString& str)
1964 {
1965   if ( m_autoSort ) {
1966     // insert the string at the correct position to keep the array sorted
1967     size_t i,
1968            lo = 0,
1969            hi = m_nCount;
1970     int res;
1971     while ( lo < hi ) {
1972       i = (lo + hi)/2;
1973
1974       res = wxStrcmp(str, m_pItems[i]);
1975       if ( res < 0 )
1976         hi = i;
1977       else if ( res > 0 )
1978         lo = i + 1;
1979       else {
1980         lo = hi = i;
1981         break;
1982       }
1983     }
1984
1985     wxASSERT_MSG( lo == hi, wxT("binary search broken") );
1986
1987     Insert(str, lo);
1988
1989     return (size_t)lo;
1990   }
1991   else {
1992     wxASSERT( str.GetStringData()->IsValid() );
1993
1994     Grow();
1995
1996     // the string data must not be deleted!
1997     str.GetStringData()->Lock();
1998
1999     // just append
2000     m_pItems[m_nCount] = (wxChar *)str.c_str(); // const_cast
2001
2002     return m_nCount++;
2003   }
2004 }
2005
2006 // add item at the given position
2007 void wxArrayString::Insert(const wxString& str, size_t nIndex)
2008 {
2009   wxASSERT( str.GetStringData()->IsValid() );
2010
2011   wxCHECK_RET( nIndex <= m_nCount, wxT("bad index in wxArrayString::Insert") );
2012
2013   Grow();
2014
2015   memmove(&m_pItems[nIndex + 1], &m_pItems[nIndex],
2016           (m_nCount - nIndex)*sizeof(wxChar *));
2017
2018   str.GetStringData()->Lock();
2019   m_pItems[nIndex] = (wxChar *)str.c_str();
2020
2021   m_nCount++;
2022 }
2023
2024 // removes item from array (by index)
2025 void wxArrayString::Remove(size_t nIndex)
2026 {
2027   wxCHECK_RET( nIndex <= m_nCount, wxT("bad index in wxArrayString::Remove") );
2028
2029   // release our lock
2030   Item(nIndex).GetStringData()->Unlock();
2031
2032   memmove(&m_pItems[nIndex], &m_pItems[nIndex + 1],
2033           (m_nCount - nIndex - 1)*sizeof(wxChar *));
2034   m_nCount--;
2035 }
2036
2037 // removes item from array (by value)
2038 void wxArrayString::Remove(const wxChar *sz)
2039 {
2040   int iIndex = Index(sz);
2041
2042   wxCHECK_RET( iIndex != wxNOT_FOUND,
2043                wxT("removing inexistent element in wxArrayString::Remove") );
2044
2045   Remove(iIndex);
2046 }
2047
2048 // ----------------------------------------------------------------------------
2049 // sorting
2050 // ----------------------------------------------------------------------------
2051
2052 // we can only sort one array at a time with the quick-sort based
2053 // implementation
2054 #if wxUSE_THREADS
2055   // need a critical section to protect access to gs_compareFunction and
2056   // gs_sortAscending variables
2057   static wxCriticalSection *gs_critsectStringSort = NULL;
2058
2059   // call this before the value of the global sort vars is changed/after
2060   // you're finished with them
2061   #define START_SORT()     wxASSERT( !gs_critsectStringSort );                \
2062                            gs_critsectStringSort = new wxCriticalSection;     \
2063                            gs_critsectStringSort->Enter()
2064   #define END_SORT()       gs_critsectStringSort->Leave();                    \
2065                            delete gs_critsectStringSort;                      \
2066                            gs_critsectStringSort = NULL
2067 #else // !threads
2068   #define START_SORT()
2069   #define END_SORT()
2070 #endif // wxUSE_THREADS
2071
2072 // function to use for string comparaison
2073 static wxArrayString::CompareFunction gs_compareFunction = NULL;
2074
2075 // if we don't use the compare function, this flag tells us if we sort the
2076 // array in ascending or descending order
2077 static bool gs_sortAscending = TRUE;
2078
2079 // function which is called by quick sort
2080 static int LINKAGEMODE wxStringCompareFunction(const void *first, const void *second)
2081 {
2082   wxString *strFirst = (wxString *)first;
2083   wxString *strSecond = (wxString *)second;
2084
2085   if ( gs_compareFunction ) {
2086     return gs_compareFunction(*strFirst, *strSecond);
2087   }
2088   else {
2089     // maybe we should use wxStrcoll
2090     int result = wxStrcmp(strFirst->c_str(), strSecond->c_str());
2091
2092     return gs_sortAscending ? result : -result;
2093   }
2094 }
2095
2096 // sort array elements using passed comparaison function
2097 void wxArrayString::Sort(CompareFunction compareFunction)
2098 {
2099   START_SORT();
2100
2101   wxASSERT( !gs_compareFunction );  // must have been reset to NULL
2102   gs_compareFunction = compareFunction;
2103
2104   DoSort();
2105
2106   END_SORT();
2107 }
2108
2109 void wxArrayString::Sort(bool reverseOrder)
2110 {
2111   START_SORT();
2112
2113   wxASSERT( !gs_compareFunction );  // must have been reset to NULL
2114   gs_sortAscending = !reverseOrder;
2115
2116   DoSort();
2117
2118   END_SORT();
2119 }
2120
2121 void wxArrayString::DoSort()
2122 {
2123   wxCHECK_RET( !m_autoSort, wxT("can't use this method with sorted arrays") );
2124
2125   // just sort the pointers using qsort() - of course it only works because
2126   // wxString() *is* a pointer to its data
2127   qsort(m_pItems, m_nCount, sizeof(wxChar *), wxStringCompareFunction);
2128 }
2129