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 #endif
  38
  39 #include <ctype.h>
  40 #include <string.h>
  41 #include <stdlib.h>
  42
  43 #ifdef  WXSTRING_IS_WXOBJECT
  44   IMPLEMENT_DYNAMIC_CLASS(wxString, wxObject)
  45 #endif  //WXSTRING_IS_WXOBJECT
  46
  47 // allocating extra space for each string consumes more memory but speeds up
  48 // the concatenation operations (nLen is the current string's length)
  49 #define EXTRA_ALLOC       16
  50
  51 // ---------------------------------------------------------------------------
  52 // static class variables definition
  53 // ---------------------------------------------------------------------------
  54
  55 #ifdef  STD_STRING_COMPATIBILITY
  56   const size_t wxString::npos = STRING_MAXLEN;
  57 #endif
  58
  59 // ----------------------------------------------------------------------------
  60 // static data
  61 // ----------------------------------------------------------------------------
  62
  63 // for an empty string, GetStringData() will return this address
  64 static int g_strEmpty[] = { -1,     // ref count (locked)
  65                              0,     // current length
  66                              0,     // allocated memory
  67                              0 };   // string data
  68 // empty C style string: points to 'string data' byte of g_strEmpty
  69 extern const char *g_szNul = (const char *)(&g_strEmpty[3]);
  70
  71 // ----------------------------------------------------------------------------
  72 // global functions
  73 // ----------------------------------------------------------------------------
  74
  75 #ifdef  STD_STRING_COMPATIBILITY
  76
  77 // MS Visual C++ version 5.0 provides the new STL headers as well as the old
  78 // iostream ones.
  79 //
  80 // ATTN: you can _not_ use both of these in the same program!
  81 #if 0 // def  _MSC_VER
  82   #include  <iostream>
  83   #define   NAMESPACE   std::
  84 #else
  85   #include  <iostream.h>
  86   #define   NAMESPACE
  87 #endif  //Visual C++
  88
  89 NAMESPACE istream& operator>>(NAMESPACE istream& is, wxString& WXUNUSED(str))
  90 {
  91 #if 0
  92   int w = is.width(0);
  93   if ( is.ipfx(0) ) {
  94     NAMESPACE streambuf *sb = is.rdbuf();
  95     str.erase();
  96     while ( true ) {
  97       int ch = sb->sbumpc ();
  98       if ( ch == EOF ) {
  99         is.setstate(NAMESPACE ios::eofbit);
 100         break;
 101       }
 102       else if ( isspace(ch) ) {
 103         sb->sungetc();
 104         break;
 105       }
 106
 107       str += ch;
 108       if ( --w == 1 )
 109         break;
 110     }
 111   }
 112
 113   is.isfx();
 114   if ( str.length() == 0 )
 115     is.setstate(NAMESPACE ios::failbit);
 116 #endif
 117   return is;
 118 }
 119
 120 #endif  //std::string compatibility
 121
 122 // ----------------------------------------------------------------------------
 123 // private classes
 124 // ----------------------------------------------------------------------------
 125
 126 // this small class is used to gather statistics for performance tuning
 127 //#define WXSTRING_STATISTICS
 128 #ifdef  WXSTRING_STATISTICS
 129   class Averager
 130   {
 131   public:
 132     Averager(const char *sz) { m_sz = sz; m_nTotal = m_nCount = 0; }
 133    ~Averager()
 134    { printf("wxString: average %s = %f\n", m_sz, ((float)m_nTotal)/m_nCount); }
 135
 136     void Add(uint n) { m_nTotal += n; m_nCount++; }
 137
 138   private:
 139     uint m_nCount, m_nTotal;
 140     const char *m_sz;
 141   } g_averageLength("allocation size"),
 142     g_averageSummandLength("summand length"),
 143     g_averageConcatHit("hit probability in concat"),
 144     g_averageInitialLength("initial string length");
 145
 146   #define STATISTICS_ADD(av, val) g_average##av.Add(val)
 147 #else
 148   #define STATISTICS_ADD(av, val)
 149 #endif // WXSTRING_STATISTICS
 150
 151 // ===========================================================================
 152 // wxString class core
 153 // ===========================================================================
 154
 155 // ---------------------------------------------------------------------------
 156 // construction
 157 // ---------------------------------------------------------------------------
 158
 159 // constructs string of <nLength> copies of character <ch>
 160 wxString::wxString(char ch, size_t nLength)
 161 {
 162   Init();
 163
 164   if ( nLength > 0 ) {
 165     AllocBuffer(nLength);
 166
 167     wxASSERT( sizeof(char) == 1 );  // can't use memset if not
 168
 169     memset(m_pchData, ch, nLength);
 170   }
 171 }
 172
 173 // takes nLength elements of psz starting at nPos
 174 void wxString::InitWith(const char *psz, size_t nPos, size_t nLength)
 175 {
 176   Init();
 177
 178   wxASSERT( nPos <= Strlen(psz) );
 179
 180   if ( nLength == STRING_MAXLEN )
 181     nLength = Strlen(psz + nPos);
 182
 183   STATISTICS_ADD(InitialLength, nLength);
 184
 185   if ( nLength > 0 ) {
 186     // trailing '\0' is written in AllocBuffer()
 187     AllocBuffer(nLength);
 188     memcpy(m_pchData, psz + nPos, nLength*sizeof(char));
 189   }
 190 }
 191
 192 // the same as previous constructor, but for compilers using unsigned char
 193 wxString::wxString(const unsigned char* psz, size_t nLength)
 194 {
 195   InitWith((const char *)psz, 0, nLength);
 196 }
 197
 198 #ifdef  STD_STRING_COMPATIBILITY
 199
 200 // poor man's iterators are "void *" pointers
 201 wxString::wxString(const void *pStart, const void *pEnd)
 202 {
 203   InitWith((const char *)pStart, 0,
 204            (const char *)pEnd - (const char *)pStart);
 205 }
 206
 207 #endif  //std::string compatibility
 208
 209 // from wide string
 210 wxString::wxString(const wchar_t *pwz)
 211 {
 212   // first get necessary size
 213   size_t nLen = wcstombs(NULL, pwz, 0);
 214
 215   // empty?
 216   if ( nLen != 0 ) {
 217     AllocBuffer(nLen);
 218     wcstombs(m_pchData, pwz, nLen);
 219   }
 220   else {
 221     Init();
 222   }
 223 }
 224
 225 // ---------------------------------------------------------------------------
 226 // memory allocation
 227 // ---------------------------------------------------------------------------
 228
 229 // allocates memory needed to store a C string of length nLen
 230 void wxString::AllocBuffer(size_t nLen)
 231 {
 232   wxASSERT( nLen >  0         );    //
 233   wxASSERT( nLen <= INT_MAX-1 );    // max size (enough room for 1 extra)
 234
 235   STATISTICS_ADD(Length, nLen);
 236
 237   // allocate memory:
 238   // 1) one extra character for '\0' termination
 239   // 2) sizeof(wxStringData) for housekeeping info
 240   wxStringData* pData = (wxStringData*)
 241     malloc(sizeof(wxStringData) + (nLen + EXTRA_ALLOC + 1)*sizeof(char));
 242   pData->nRefs        = 1;
 243   pData->nDataLength  = nLen;
 244   pData->nAllocLength = nLen + EXTRA_ALLOC;
 245   m_pchData           = pData->data();  // data starts after wxStringData
 246   m_pchData[nLen]     = '\0';
 247 }
 248
 249 // must be called before changing this string
 250 void wxString::CopyBeforeWrite()
 251 {
 252   wxStringData* pData = GetStringData();
 253
 254   if ( pData->IsShared() ) {
 255     pData->Unlock();                // memory not freed because shared
 256     uint nLen = pData->nDataLength;
 257     AllocBuffer(nLen);
 258     memcpy(m_pchData, pData->data(), nLen*sizeof(char));
 259   }
 260
 261   wxASSERT( !pData->IsShared() );  // we must be the only owner
 262 }
 263
 264 // must be called before replacing contents of this string
 265 void wxString::AllocBeforeWrite(size_t nLen)
 266 {
 267   wxASSERT( nLen != 0 );  // doesn't make any sense
 268
 269   // must not share string and must have enough space
 270   wxStringData* pData = GetStringData();
 271   if ( pData->IsShared() || (nLen > pData->nAllocLength) ) {
 272     // can't work with old buffer, get new one
 273     pData->Unlock();
 274     AllocBuffer(nLen);
 275   }
 276
 277   wxASSERT( !GetStringData()->IsShared() );  // we must be the only owner
 278 }
 279
 280 // allocate enough memory for nLen characters
 281 void wxString::Alloc(uint nLen)
 282 {
 283   wxStringData *pData = GetStringData();
 284   if ( pData->nAllocLength <= nLen ) {
 285     if ( pData->IsEmpty() ) {
 286       nLen += EXTRA_ALLOC;
 287
 288       wxStringData* pData = (wxStringData*)
 289         malloc(sizeof(wxStringData) + (nLen + 1)*sizeof(char));
 290       pData->nRefs = 1;
 291       pData->nDataLength = 0;
 292       pData->nAllocLength = nLen;
 293       m_pchData = pData->data();  // data starts after wxStringData
 294       m_pchData[0u] = '\0';
 295     }
 296     else if ( pData->IsShared() ) {
 297       pData->Unlock();                // memory not freed because shared
 298       uint nOldLen = pData->nDataLength;
 299       AllocBuffer(nLen);
 300       memcpy(m_pchData, pData->data(), nOldLen*sizeof(char));
 301     }
 302     else {
 303       nLen += EXTRA_ALLOC;
 304
 305       wxStringData *p = (wxStringData *)
 306         realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(char));
 307
 308       if ( p == NULL ) {
 309         // @@@ what to do on memory error?
 310         return;
 311       }
 312
 313       // it's not important if the pointer changed or not (the check for this
 314       // is not faster than assigning to m_pchData in all cases)
 315       p->nAllocLength = nLen;
 316       m_pchData = p->data();
 317     }
 318   }
 319   //else: we've already got enough
 320 }
 321
 322 // shrink to minimal size (releasing extra memory)
 323 void wxString::Shrink()
 324 {
 325   wxStringData *pData = GetStringData();
 326   void *p = realloc(pData, sizeof(wxStringData) +
 327                     (pData->nDataLength + 1)*sizeof(char));
 328   wxASSERT( p != NULL );  // can't free memory?
 329   wxASSERT( p == pData ); // we're decrementing the size - block shouldn't move!
 330 }
 331
 332 // get the pointer to writable buffer of (at least) nLen bytes
 333 char *wxString::GetWriteBuf(uint nLen)
 334 {
 335   AllocBeforeWrite(nLen);
 336
 337   wxASSERT( GetStringData()->nRefs == 1 );
 338   GetStringData()->Validate(FALSE);
 339
 340   return m_pchData;
 341 }
 342
 343 // put string back in a reasonable state after GetWriteBuf
 344 void wxString::UngetWriteBuf()
 345 {
 346   GetStringData()->nDataLength = strlen(m_pchData);
 347   GetStringData()->Validate(TRUE);
 348 }
 349
 350 // ---------------------------------------------------------------------------
 351 // data access
 352 // ---------------------------------------------------------------------------
 353
 354 // all functions are inline in string.h
 355
 356 // ---------------------------------------------------------------------------
 357 // assignment operators
 358 // ---------------------------------------------------------------------------
 359
 360 // helper function: does real copy
 361 void wxString::AssignCopy(size_t nSrcLen, const char *pszSrcData)
 362 {
 363   if ( nSrcLen == 0 ) {
 364     Reinit();
 365   }
 366   else {
 367     AllocBeforeWrite(nSrcLen);
 368     memcpy(m_pchData, pszSrcData, nSrcLen*sizeof(char));
 369     GetStringData()->nDataLength = nSrcLen;
 370     m_pchData[nSrcLen] = '\0';
 371   }
 372 }
 373
 374 // assigns one string to another
 375 wxString& wxString::operator=(const wxString& stringSrc)
 376 {
 377   wxASSERT( stringSrc.GetStringData()->IsValid() );
 378
 379   // don't copy string over itself
 380   if ( m_pchData != stringSrc.m_pchData ) {
 381     if ( stringSrc.GetStringData()->IsEmpty() ) {
 382       Reinit();
 383     }
 384     else {
 385       // adjust references
 386       GetStringData()->Unlock();
 387       m_pchData = stringSrc.m_pchData;
 388       GetStringData()->Lock();
 389     }
 390   }
 391
 392   return *this;
 393 }
 394
 395 // assigns a single character
 396 wxString& wxString::operator=(char ch)
 397 {
 398   AssignCopy(1, &ch);
 399   return *this;
 400 }
 401
 402 // assigns C string
 403 wxString& wxString::operator=(const char *psz)
 404 {
 405   AssignCopy(Strlen(psz), psz);
 406   return *this;
 407 }
 408
 409 // same as 'signed char' variant
 410 wxString& wxString::operator=(const unsigned char* psz)
 411 {
 412   *this = (const char *)psz;
 413   return *this;
 414 }
 415
 416 wxString& wxString::operator=(const wchar_t *pwz)
 417 {
 418   wxString str(pwz);
 419   *this = str;
 420   return *this;
 421 }
 422
 423 // ---------------------------------------------------------------------------
 424 // string concatenation
 425 // ---------------------------------------------------------------------------
 426
 427 // add something to this string
 428 void wxString::ConcatSelf(int nSrcLen, const char *pszSrcData)
 429 {
 430   STATISTICS_ADD(SummandLength, nSrcLen);
 431
 432   // concatenating an empty string is a NOP, but it happens quite rarely,
 433   // so we don't waste our time checking for it
 434   // if ( nSrcLen > 0 )
 435   wxStringData *pData = GetStringData();
 436   uint nLen = pData->nDataLength;
 437   uint nNewLen = nLen + nSrcLen;
 438
 439   // alloc new buffer if current is too small
 440   if ( pData->IsShared() ) {
 441     STATISTICS_ADD(ConcatHit, 0);
 442
 443     // we have to allocate another buffer
 444     wxStringData* pOldData = GetStringData();
 445     AllocBuffer(nNewLen);
 446     memcpy(m_pchData, pOldData->data(), nLen*sizeof(char));
 447     pOldData->Unlock();
 448   }
 449   else if ( nNewLen > pData->nAllocLength ) {
 450     STATISTICS_ADD(ConcatHit, 0);
 451
 452     // we have to grow the buffer
 453     Alloc(nNewLen);
 454   }
 455   else {
 456     STATISTICS_ADD(ConcatHit, 1);
 457
 458     // the buffer is already big enough
 459   }
 460
 461   // should be enough space
 462   wxASSERT( nNewLen <= GetStringData()->nAllocLength );
 463
 464   // fast concatenation - all is done in our buffer
 465   memcpy(m_pchData + nLen, pszSrcData, nSrcLen*sizeof(char));
 466
 467   m_pchData[nNewLen] = '\0';              // put terminating '\0'
 468   GetStringData()->nDataLength = nNewLen; // and fix the length
 469 }
 470
 471 /*
 472  * concatenation functions come in 5 flavours:
 473  *  string + string
 474  *  char   + string      and      string + char
 475  *  C str  + string      and      string + C str
 476  */
 477
 478 wxString operator+(const wxString& string1, const wxString& string2)
 479 {
 480   wxASSERT( string1.GetStringData()->IsValid() );
 481   wxASSERT( string2.GetStringData()->IsValid() );
 482
 483   wxString s = string1;
 484   s += string2;
 485
 486   return s;
 487 }
 488
 489 wxString operator+(const wxString& string, char ch)
 490 {
 491   wxASSERT( string.GetStringData()->IsValid() );
 492
 493   wxString s = string;
 494   s += ch;
 495
 496   return s;
 497 }
 498
 499 wxString operator+(char ch, const wxString& string)
 500 {
 501   wxASSERT( string.GetStringData()->IsValid() );
 502
 503   wxString s = ch;
 504   s += string;
 505
 506   return s;
 507 }
 508
 509 wxString operator+(const wxString& string, const char *psz)
 510 {
 511   wxASSERT( string.GetStringData()->IsValid() );
 512
 513   wxString s;
 514   s.Alloc(Strlen(psz) + string.Len());
 515   s = string;
 516   s += psz;
 517
 518   return s;
 519 }
 520
 521 wxString operator+(const char *psz, const wxString& string)
 522 {
 523   wxASSERT( string.GetStringData()->IsValid() );
 524
 525   wxString s;
 526   s.Alloc(Strlen(psz) + string.Len());
 527   s = psz;
 528   s += string;
 529
 530   return s;
 531 }
 532
 533 // ===========================================================================
 534 // other common string functions
 535 // ===========================================================================
 536
 537 // ---------------------------------------------------------------------------
 538 // simple sub-string extraction
 539 // ---------------------------------------------------------------------------
 540
 541 // helper function: clone the data attached to this string
 542 void wxString::AllocCopy(wxString& dest, int nCopyLen, int nCopyIndex) const
 543 {
 544   if ( nCopyLen == 0 ) {
 545     dest.Init();
 546   }
 547   else {
 548     dest.AllocBuffer(nCopyLen);
 549     memcpy(dest.m_pchData, m_pchData + nCopyIndex, nCopyLen*sizeof(char));
 550   }
 551 }
 552
 553 // extract string of length nCount starting at nFirst
 554 // default value of nCount is 0 and means "till the end"
 555 wxString wxString::Mid(size_t nFirst, size_t nCount) const
 556 {
 557   // out-of-bounds requests return sensible things
 558   if ( nCount == 0 )
 559     nCount = GetStringData()->nDataLength - nFirst;
 560
 561   if ( nFirst + nCount > (size_t)GetStringData()->nDataLength )
 562     nCount = GetStringData()->nDataLength - nFirst;
 563   if ( nFirst > (size_t)GetStringData()->nDataLength )
 564     nCount = 0;
 565
 566   wxString dest;
 567   AllocCopy(dest, nCount, nFirst);
 568   return dest;
 569 }
 570
 571 // extract nCount last (rightmost) characters
 572 wxString wxString::Right(size_t nCount) const
 573 {
 574   if ( nCount > (size_t)GetStringData()->nDataLength )
 575     nCount = GetStringData()->nDataLength;
 576
 577   wxString dest;
 578   AllocCopy(dest, nCount, GetStringData()->nDataLength - nCount);
 579   return dest;
 580 }
 581
 582 // get all characters after the last occurence of ch
 583 // (returns the whole string if ch not found)
 584 wxString wxString::Right(char ch) const
 585 {
 586   wxString str;
 587   int iPos = Find(ch, TRUE);
 588   if ( iPos == NOT_FOUND )
 589     str = *this;
 590   else
 591     str = c_str() + iPos + 1;
 592
 593   return str;
 594 }
 595
 596 // extract nCount first (leftmost) characters
 597 wxString wxString::Left(size_t nCount) const
 598 {
 599   if ( nCount > (size_t)GetStringData()->nDataLength )
 600     nCount = GetStringData()->nDataLength;
 601
 602   wxString dest;
 603   AllocCopy(dest, nCount, 0);
 604   return dest;
 605 }
 606
 607 // get all characters before the first occurence of ch
 608 // (returns the whole string if ch not found)
 609 wxString wxString::Left(char ch) const
 610 {
 611   wxString str;
 612   for ( const char *pc = m_pchData; *pc != '\0' && *pc != ch; pc++ )
 613     str += *pc;
 614
 615   return str;
 616 }
 617
 618 /// get all characters before the last occurence of ch
 619 /// (returns empty string if ch not found)
 620 wxString wxString::Before(char ch) const
 621 {
 622   wxString str;
 623   int iPos = Find(ch, TRUE);
 624   if ( iPos != NOT_FOUND && iPos != 0 )
 625     str = wxString(c_str(), iPos);
 626
 627   return str;
 628 }
 629
 630 /// get all characters after the first occurence of ch
 631 /// (returns empty string if ch not found)
 632 wxString wxString::After(char ch) const
 633 {
 634   wxString str;
 635   int iPos = Find(ch);
 636   if ( iPos != NOT_FOUND )
 637     str = c_str() + iPos + 1;
 638
 639   return str;
 640 }
 641
 642 // replace first (or all) occurences of some substring with another one
 643 uint wxString::Replace(const char *szOld, const char *szNew, bool bReplaceAll)
 644 {
 645   uint uiCount = 0;   // count of replacements made
 646
 647   uint uiOldLen = Strlen(szOld);
 648
 649   wxString strTemp;
 650   const char *pCurrent = m_pchData;
 651   const char *pSubstr;
 652   while ( *pCurrent != '\0' ) {
 653     pSubstr = strstr(pCurrent, szOld);
 654     if ( pSubstr == NULL ) {
 655       // strTemp is unused if no replacements were made, so avoid the copy
 656       if ( uiCount == 0 )
 657         return 0;
 658
 659       strTemp += pCurrent;    // copy the rest
 660       break;                  // exit the loop
 661     }
 662     else {
 663       // take chars before match
 664       strTemp.ConcatSelf(pSubstr - pCurrent, pCurrent);
 665       strTemp += szNew;
 666       pCurrent = pSubstr + uiOldLen;  // restart after match
 667
 668       uiCount++;
 669
 670       // stop now?
 671       if ( !bReplaceAll ) {
 672         strTemp += pCurrent;    // copy the rest
 673         break;                  // exit the loop
 674       }
 675     }
 676   }
 677
 678   // only done if there were replacements, otherwise would have returned above
 679   *this = strTemp;
 680
 681   return uiCount;
 682 }
 683
 684 bool wxString::IsAscii() const
 685 {
 686   const char *s = (const char*) *this;
 687   while(*s){
 688     if(!isascii(*s)) return(FALSE);
 689     s++;
 690   }
 691   return(TRUE);
 692 }
 693
 694 bool wxString::IsWord() const
 695 {
 696   const char *s = (const char*) *this;
 697   while(*s){
 698     if(!isalpha(*s)) return(FALSE);
 699     s++;
 700   }
 701   return(TRUE);
 702 }
 703
 704 bool wxString::IsNumber() const
 705 {
 706   const char *s = (const char*) *this;
 707   while(*s){
 708     if(!isdigit(*s)) return(FALSE);
 709     s++;
 710   }
 711   return(TRUE);
 712 }
 713
 714 wxString wxString::Strip(stripType w) const
 715 {
 716     wxString s = *this;
 717     if ( w & leading ) s.Trim(FALSE);
 718     if ( w & trailing ) s.Trim(TRUE);
 719     return s;
 720 }
 721
 722 // ---------------------------------------------------------------------------
 723 // case conversion
 724 // ---------------------------------------------------------------------------
 725
 726 wxString& wxString::MakeUpper()
 727 {
 728   CopyBeforeWrite();
 729
 730   for ( char *p = m_pchData; *p; p++ )
 731     *p = (char)toupper(*p);
 732
 733   return *this;
 734 }
 735
 736 wxString& wxString::MakeLower()
 737 {
 738   CopyBeforeWrite();
 739
 740   for ( char *p = m_pchData; *p; p++ )
 741     *p = (char)tolower(*p);
 742
 743   return *this;
 744 }
 745
 746 // ---------------------------------------------------------------------------
 747 // trimming and padding
 748 // ---------------------------------------------------------------------------
 749
 750 // trims spaces (in the sense of isspace) from left or right side
 751 wxString& wxString::Trim(bool bFromRight)
 752 {
 753   CopyBeforeWrite();
 754
 755   if ( bFromRight )
 756   {
 757     // find last non-space character
 758     char *psz = m_pchData + GetStringData()->nDataLength - 1;
 759     while ( isspace(*psz) && (psz >= m_pchData) )
 760       psz--;
 761
 762     // truncate at trailing space start
 763     *++psz = '\0';
 764     GetStringData()->nDataLength = psz - m_pchData;
 765   }
 766   else
 767   {
 768     // find first non-space character
 769     const char *psz = m_pchData;
 770     while ( isspace(*psz) )
 771       psz++;
 772
 773     // fix up data and length
 774     int nDataLength = GetStringData()->nDataLength - (psz - m_pchData);
 775     memmove(m_pchData, psz, (nDataLength + 1)*sizeof(char));
 776     GetStringData()->nDataLength = nDataLength;
 777   }
 778
 779   return *this;
 780 }
 781
 782 // adds nCount characters chPad to the string from either side
 783 wxString& wxString::Pad(size_t nCount, char chPad, bool bFromRight)
 784 {
 785   wxString s(chPad, nCount);
 786
 787   if ( bFromRight )
 788     *this += s;
 789   else
 790   {
 791     s += *this;
 792     *this = s;
 793   }
 794
 795   return *this;
 796 }
 797
 798 // truncate the string
 799 wxString& wxString::Truncate(size_t uiLen)
 800 {
 801   *(m_pchData + uiLen) = '\0';
 802   GetStringData()->nDataLength = uiLen;
 803
 804   return *this;
 805 }
 806
 807 // ---------------------------------------------------------------------------
 808 // finding (return NOT_FOUND if not found and index otherwise)
 809 // ---------------------------------------------------------------------------
 810
 811 // find a character
 812 int wxString::Find(char ch, bool bFromEnd) const
 813 {
 814   const char *psz = bFromEnd ? strrchr(m_pchData, ch) : strchr(m_pchData, ch);
 815
 816   return (psz == NULL) ? NOT_FOUND : psz - m_pchData;
 817 }
 818
 819 // find a sub-string (like strstr)
 820 int wxString::Find(const char *pszSub) const
 821 {
 822   const char *psz = strstr(m_pchData, pszSub);
 823
 824   return (psz == NULL) ? NOT_FOUND : psz - m_pchData;
 825 }
 826
 827 // ---------------------------------------------------------------------------
 828 // formatted output
 829 // ---------------------------------------------------------------------------
 830 int wxString::Printf(const char *pszFormat, ...)
 831 {
 832   va_list argptr;
 833   va_start(argptr, pszFormat);
 834
 835   int iLen = PrintfV(pszFormat, argptr);
 836
 837   va_end(argptr);
 838
 839   return iLen;
 840 }
 841
 842 int wxString::PrintfV(const char* pszFormat, va_list argptr)
 843 {
 844   static char s_szScratch[1024];
 845
 846   int iLen = vsprintf(s_szScratch, pszFormat, argptr);
 847   AllocBeforeWrite(iLen);
 848   strcpy(m_pchData, s_szScratch);
 849
 850   return iLen;
 851 }
 852
 853 // ----------------------------------------------------------------------------
 854 // misc other operations
 855 // ----------------------------------------------------------------------------
 856 bool wxString::Matches(const char *pszMask) const
 857 {
 858   // check char by char
 859   const char *pszTxt;
 860   for ( pszTxt = c_str(); *pszMask != '\0'; pszMask++, pszTxt++ ) {
 861     switch ( *pszMask ) {
 862       case '?':
 863         if ( *pszTxt == '\0' )
 864           return FALSE;
 865
 866         pszTxt++;
 867         pszMask++;
 868         break;
 869
 870       case '*':
 871         {
 872           // ignore special chars immediately following this one
 873           while ( *pszMask == '*' || *pszMask == '?' )
 874             pszMask++;
 875
 876           // if there is nothing more, match
 877           if ( *pszMask == '\0' )
 878             return TRUE;
 879
 880           // are there any other metacharacters in the mask?
 881           uint uiLenMask;
 882           const char *pEndMask = strpbrk(pszMask, "*?");
 883
 884           if ( pEndMask != NULL ) {
 885             // we have to match the string between two metachars
 886             uiLenMask = pEndMask - pszMask;
 887           }
 888           else {
 889             // we have to match the remainder of the string
 890             uiLenMask = strlen(pszMask);
 891           }
 892
 893           wxString strToMatch(pszMask, uiLenMask);
 894           const char* pMatch = strstr(pszTxt, strToMatch);
 895           if ( pMatch == NULL )
 896             return FALSE;
 897
 898           // -1 to compensate "++" in the loop
 899           pszTxt = pMatch + uiLenMask - 1;
 900           pszMask += uiLenMask - 1;
 901         }
 902         break;
 903
 904       default:
 905         if ( *pszMask != *pszTxt )
 906           return FALSE;
 907         break;
 908     }
 909   }
 910
 911   // match only if nothing left
 912   return *pszTxt == '\0';
 913 }
 914
 915 // ---------------------------------------------------------------------------
 916 // standard C++ library string functions
 917 // ---------------------------------------------------------------------------
 918 #ifdef  STD_STRING_COMPATIBILITY
 919
 920 wxString& wxString::insert(size_t nPos, const wxString& str)
 921 {
 922   wxASSERT( str.GetStringData()->IsValid() );
 923   wxASSERT( nPos <= Len() );
 924
 925   wxString strTmp;
 926   char *pc = strTmp.GetWriteBuf(Len() + str.Len());
 927   strncpy(pc, c_str(), nPos);
 928   strcpy(pc + nPos, str);
 929   strcpy(pc + nPos + str.Len(), c_str() + nPos);
 930   strTmp.UngetWriteBuf();
 931   *this = strTmp;
 932
 933   return *this;
 934 }
 935
 936 size_t wxString::find(const wxString& str, size_t nStart) const
 937 {
 938   wxASSERT( str.GetStringData()->IsValid() );
 939   wxASSERT( nStart <= Len() );
 940
 941   const char *p = strstr(c_str() + nStart, str);
 942
 943   return p == NULL ? npos : p - c_str();
 944 }
 945
 946 // VC++ 1.5 can't cope with the default argument in the header.
 947 #if ! (defined(_MSC_VER) && !defined(__WIN32__))
 948 size_t wxString::find(const char* sz, size_t nStart, size_t n) const
 949 {
 950   return find(wxString(sz, n == npos ? 0 : n), nStart);
 951 }
 952 #endif
 953
 954 size_t wxString::find(char ch, size_t nStart) const
 955 {
 956   wxASSERT( nStart <= Len() );
 957
 958   const char *p = strchr(c_str() + nStart, ch);
 959
 960   return p == NULL ? npos : p - c_str();
 961 }
 962
 963 size_t wxString::rfind(const wxString& str, size_t nStart) const
 964 {
 965   wxASSERT( str.GetStringData()->IsValid() );
 966   wxASSERT( nStart <= Len() );
 967
 968   // # could be quicker than that
 969   const char *p = c_str() + (nStart == npos ? Len() : nStart);
 970   while ( p >= c_str() + str.Len() ) {
 971     if ( strncmp(p - str.Len(), str, str.Len()) == 0 )
 972       return p - str.Len() - c_str();
 973     p--;
 974   }
 975
 976   return npos;
 977 }
 978
 979 // VC++ 1.5 can't cope with the default argument in the header.
 980 #if ! (defined(_MSC_VER) && !defined(__WIN32__))
 981 size_t wxString::rfind(const char* sz, size_t nStart, size_t n) const
 982 {
 983   return rfind(wxString(sz, n == npos ? 0 : n), nStart);
 984 }
 985
 986 size_t wxString::rfind(char ch, size_t nStart) const
 987 {
 988   wxASSERT( nStart <= Len() );
 989
 990   const char *p = strrchr(c_str() + nStart, ch);
 991
 992   return p == NULL ? npos : p - c_str();
 993 }
 994 #endif
 995
 996 wxString wxString::substr(size_t nStart, size_t nLen) const
 997 {
 998   // npos means 'take all'
 999   if ( nLen == npos )
1000     nLen = 0;
1001
1002   wxASSERT( nStart + nLen <= Len() );
1003
1004   return wxString(c_str() + nStart, nLen == npos ? 0 : nLen);
1005 }
1006
1007 wxString& wxString::erase(size_t nStart, size_t nLen)
1008 {
1009   wxString strTmp(c_str(), nStart);
1010   if ( nLen != npos ) {
1011     wxASSERT( nStart + nLen <= Len() );
1012
1013     strTmp.append(c_str() + nStart + nLen);
1014   }
1015
1016   *this = strTmp;
1017   return *this;
1018 }
1019
1020 wxString& wxString::replace(size_t nStart, size_t nLen, const char *sz)
1021 {
1022   wxASSERT( nStart + nLen <= Strlen(sz) );
1023
1024   wxString strTmp;
1025   if ( nStart != 0 )
1026     strTmp.append(c_str(), nStart);
1027   strTmp += sz;
1028   strTmp.append(c_str() + nStart + nLen);
1029
1030   *this = strTmp;
1031   return *this;
1032 }
1033
1034 wxString& wxString::replace(size_t nStart, size_t nLen, size_t nCount, char ch)
1035 {
1036   return replace(nStart, nLen, wxString(ch, nCount));
1037 }
1038
1039 wxString& wxString::replace(size_t nStart, size_t nLen,
1040                             const wxString& str, size_t nStart2, size_t nLen2)
1041 {
1042   return replace(nStart, nLen, str.substr(nStart2, nLen2));
1043 }
1044
1045 wxString& wxString::replace(size_t nStart, size_t nLen,
1046                         const char* sz, size_t nCount)
1047 {
1048   return replace(nStart, nLen, wxString(sz, nCount));
1049 }
1050
1051 #endif  //std::string compatibility
1052
1053 // ============================================================================
1054 // ArrayString
1055 // ============================================================================
1056
1057 // size increment = max(50% of current size, ARRAY_MAXSIZE_INCREMENT)
1058 #define   ARRAY_MAXSIZE_INCREMENT       4096
1059 #ifndef   ARRAY_DEFAULT_INITIAL_SIZE    // also defined in dynarray.h
1060   #define   ARRAY_DEFAULT_INITIAL_SIZE    (16)
1061 #endif
1062
1063 #define   STRING(p)   ((wxString *)(&(p)))
1064
1065 // ctor
1066 wxArrayString::wxArrayString()
1067 {
1068   m_nSize  =
1069   m_nCount = 0;
1070   m_pItems = NULL;
1071 }
1072
1073 // copy ctor
1074 wxArrayString::wxArrayString(const wxArrayString& src)
1075 {
1076   m_pItems = NULL;
1077
1078   *this = src;
1079 }
1080
1081 // assignment operator
1082 wxArrayString& wxArrayString::operator=(const wxArrayString& src)
1083 {
1084   DELETEA(m_pItems);
1085
1086   m_nSize = 0;
1087   if ( src.m_nCount > ARRAY_DEFAULT_INITIAL_SIZE )
1088     Alloc(src.m_nCount);
1089
1090   // we can't just copy the pointers here because otherwise we would share
1091   // the strings with another array
1092   for ( uint n = 0; n < src.m_nCount; n++ )
1093     Add(src[n]);
1094
1095   return *this;
1096 }
1097
1098 // grow the array
1099 void wxArrayString::Grow()
1100 {
1101   // only do it if no more place
1102   if( m_nCount == m_nSize ) {
1103     if( m_nSize == 0 ) {
1104       // was empty, alloc some memory
1105       m_nSize = ARRAY_DEFAULT_INITIAL_SIZE;
1106       m_pItems = new char *[m_nSize];
1107     }
1108     else {
1109       // add 50% but not too much
1110       size_t nIncrement = m_nSize < ARRAY_DEFAULT_INITIAL_SIZE
1111                           ? ARRAY_DEFAULT_INITIAL_SIZE : m_nSize >> 1;
1112       if ( nIncrement > ARRAY_MAXSIZE_INCREMENT )
1113         nIncrement = ARRAY_MAXSIZE_INCREMENT;
1114       m_nSize += nIncrement;
1115       char **pNew = new char *[m_nSize];
1116
1117       // copy data to new location
1118       memcpy(pNew, m_pItems, m_nCount*sizeof(char *));
1119
1120       // delete old memory (but do not release the strings!)
1121       DELETEA(m_pItems);
1122
1123       m_pItems = pNew;
1124     }
1125   }
1126 }
1127
1128 void wxArrayString::Free()
1129 {
1130   for ( size_t n = 0; n < m_nCount; n++ ) {
1131     STRING(m_pItems[n])->GetStringData()->Unlock();
1132   }
1133 }
1134
1135 // deletes all the strings from the list
1136 void wxArrayString::Empty()
1137 {
1138   Free();
1139
1140   m_nCount = 0;
1141 }
1142
1143 // as Empty, but also frees memory
1144 void wxArrayString::Clear()
1145 {
1146   Free();
1147
1148   m_nSize  =
1149   m_nCount = 0;
1150
1151   DELETEA(m_pItems);
1152   m_pItems = NULL;
1153 }
1154
1155 // dtor
1156 wxArrayString::~wxArrayString()
1157 {
1158   Free();
1159
1160   DELETEA(m_pItems);
1161 }
1162
1163 // pre-allocates memory (frees the previous data!)
1164 void wxArrayString::Alloc(size_t nSize)
1165 {
1166   wxASSERT( nSize > 0 );
1167
1168   // only if old buffer was not big enough
1169   if ( nSize > m_nSize ) {
1170     Free();
1171     DELETEA(m_pItems);
1172     m_pItems = new char *[nSize];
1173     m_nSize  = nSize;
1174   }
1175
1176   m_nCount = 0;
1177 }
1178
1179 // searches the array for an item (forward or backwards)
1180 int wxArrayString::Index(const char *sz, bool bCase, bool bFromEnd) const
1181 {
1182   if ( bFromEnd ) {
1183     if ( m_nCount > 0 ) {
1184       uint ui = m_nCount;
1185       do {
1186         if ( STRING(m_pItems[--ui])->IsSameAs(sz, bCase) )
1187           return ui;
1188       }
1189       while ( ui != 0 );
1190     }
1191   }
1192   else {
1193     for( uint ui = 0; ui < m_nCount; ui++ ) {
1194       if( STRING(m_pItems[ui])->IsSameAs(sz, bCase) )
1195         return ui;
1196     }
1197   }
1198
1199   return NOT_FOUND;
1200 }
1201
1202 // add item at the end
1203 void wxArrayString::Add(const wxString& str)
1204 {
1205   wxASSERT( str.GetStringData()->IsValid() );
1206
1207   Grow();
1208
1209   // the string data must not be deleted!
1210   str.GetStringData()->Lock();
1211   m_pItems[m_nCount++] = (char *)str.c_str();
1212 }
1213
1214 // add item at the given position
1215 void wxArrayString::Insert(const wxString& str, size_t nIndex)
1216 {
1217   wxASSERT( str.GetStringData()->IsValid() );
1218
1219   wxCHECK_RET( nIndex <= m_nCount, "bad index in wxArrayString::Insert" );
1220
1221   Grow();
1222
1223   memmove(&m_pItems[nIndex + 1], &m_pItems[nIndex],
1224           (m_nCount - nIndex)*sizeof(char *));
1225
1226   str.GetStringData()->Lock();
1227   m_pItems[nIndex] = (char *)str.c_str();
1228
1229   m_nCount++;
1230 }
1231
1232 // removes item from array (by index)
1233 void wxArrayString::Remove(size_t nIndex)
1234 {
1235   wxCHECK_RET( nIndex <= m_nCount, "bad index in wxArrayString::Remove" );
1236
1237   // release our lock
1238   Item(nIndex).GetStringData()->Unlock();
1239
1240   memmove(&m_pItems[nIndex], &m_pItems[nIndex + 1],
1241           (m_nCount - nIndex - 1)*sizeof(char *));
1242   m_nCount--;
1243 }
1244
1245 // removes item from array (by value)
1246 void wxArrayString::Remove(const char *sz)
1247 {
1248   int iIndex = Index(sz);
1249
1250   wxCHECK_RET( iIndex != NOT_FOUND,
1251                "removing inexistent element in wxArrayString::Remove" );
1252
1253   Remove((size_t)iIndex);
1254 }
1255
1256 // sort array elements using passed comparaison function
1257
1258 void wxArrayString::Sort(bool bCase, bool bReverse)
1259 {
1260   //@@@@ TO DO
1261   //qsort(m_pItems, m_nCount, sizeof(char *), fCmp);
1262 }