| 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_UNICODE |
| 50 | #undef wxUSE_EXPERIMENTAL_PRINTF |
| 51 | #define wxUSE_EXPERIMENTAL_PRINTF 1 |
| 52 | #endif |
| 53 | |
| 54 | // allocating extra space for each string consumes more memory but speeds up |
| 55 | // the concatenation operations (nLen is the current string's length) |
| 56 | // NB: EXTRA_ALLOC must be >= 0! |
| 57 | #define EXTRA_ALLOC (19 - nLen % 16) |
| 58 | |
| 59 | // --------------------------------------------------------------------------- |
| 60 | // static class variables definition |
| 61 | // --------------------------------------------------------------------------- |
| 62 | |
| 63 | #if defined(__VISAGECPP__) && __IBMCPP__ >= 400 |
| 64 | // must define this static for VA or else you get multiply defined symbols |
| 65 | // everywhere |
| 66 | const unsigned int wxSTRING_MAXLEN = UINT_MAX - 100; |
| 67 | #endif // Visual Age |
| 68 | |
| 69 | #ifdef wxSTD_STRING_COMPATIBILITY |
| 70 | const size_t wxString::npos = wxSTRING_MAXLEN; |
| 71 | #endif // wxSTD_STRING_COMPATIBILITY |
| 72 | |
| 73 | // ---------------------------------------------------------------------------- |
| 74 | // static data |
| 75 | // ---------------------------------------------------------------------------- |
| 76 | |
| 77 | // for an empty string, GetStringData() will return this address: this |
| 78 | // structure has the same layout as wxStringData and it's data() method will |
| 79 | // return the empty string (dummy pointer) |
| 80 | static const struct |
| 81 | { |
| 82 | wxStringData data; |
| 83 | wxChar dummy; |
| 84 | } g_strEmpty = { {-1, 0, 0}, wxT('\0') }; |
| 85 | |
| 86 | // empty C style string: points to 'string data' byte of g_strEmpty |
| 87 | extern const wxChar WXDLLEXPORT *wxEmptyString = &g_strEmpty.dummy; |
| 88 | |
| 89 | // ---------------------------------------------------------------------------- |
| 90 | // conditional compilation |
| 91 | // ---------------------------------------------------------------------------- |
| 92 | |
| 93 | #if !defined(__WXSW__) && wxUSE_UNICODE |
| 94 | #ifdef wxUSE_EXPERIMENTAL_PRINTF |
| 95 | #undef wxUSE_EXPERIMENTAL_PRINTF |
| 96 | #endif |
| 97 | #define wxUSE_EXPERIMENTAL_PRINTF 1 |
| 98 | #endif |
| 99 | |
| 100 | // we want to find out if the current platform supports vsnprintf()-like |
| 101 | // function: for Unix this is done with configure, for Windows we test the |
| 102 | // compiler explicitly. |
| 103 | // |
| 104 | // FIXME currently, this is only for ANSI (!Unicode) strings, so we call this |
| 105 | // function wxVsnprintfA (A for ANSI), should also find one for Unicode |
| 106 | // strings in Unicode build |
| 107 | #ifdef __WXMSW__ |
| 108 | #if defined(__VISUALC__) || (defined(__MINGW32__) && wxUSE_NORLANDER_HEADERS) |
| 109 | #define wxVsnprintfA _vsnprintf |
| 110 | #endif |
| 111 | #elif defined(__WXMAC__) |
| 112 | #define wxVsnprintfA vsnprintf |
| 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__) |
| 128 | #warning "Using sprintf() because no snprintf()-like function defined" |
| 129 | #endif //compiler |
| 130 | #endif // no vsnprintf |
| 131 | |
| 132 | #if defined(_AIX) |
| 133 | // AIX has vsnprintf, but there's no prototype in the system headers. |
| 134 | extern "C" int vsnprintf(char* str, size_t n, const char* format, va_list ap); |
| 135 | #endif |
| 136 | |
| 137 | // ---------------------------------------------------------------------------- |
| 138 | // global functions |
| 139 | // ---------------------------------------------------------------------------- |
| 140 | |
| 141 | #if defined(wxSTD_STRING_COMPATIBILITY) && wxUSE_STD_IOSTREAM |
| 142 | |
| 143 | // MS Visual C++ version 5.0 provides the new STL headers as well as the old |
| 144 | // iostream ones. |
| 145 | // |
| 146 | // ATTN: you can _not_ use both of these in the same program! |
| 147 | |
| 148 | wxSTD istream& operator>>(wxSTD istream& is, wxString& WXUNUSED(str)) |
| 149 | { |
| 150 | #if 0 |
| 151 | int w = is.width(0); |
| 152 | if ( is.ipfx(0) ) { |
| 153 | streambuf *sb = is.rdbuf(); |
| 154 | str.erase(); |
| 155 | while ( true ) { |
| 156 | int ch = sb->sbumpc (); |
| 157 | if ( ch == EOF ) { |
| 158 | is.setstate(ios::eofbit); |
| 159 | break; |
| 160 | } |
| 161 | else if ( isspace(ch) ) { |
| 162 | sb->sungetc(); |
| 163 | break; |
| 164 | } |
| 165 | |
| 166 | str += ch; |
| 167 | if ( --w == 1 ) |
| 168 | break; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | is.isfx(); |
| 173 | if ( str.length() == 0 ) |
| 174 | is.setstate(ios::failbit); |
| 175 | #endif |
| 176 | return is; |
| 177 | } |
| 178 | |
| 179 | wxSTD ostream& operator<<(wxSTD ostream& os, const wxString& str) |
| 180 | { |
| 181 | os << str.c_str(); |
| 182 | return os; |
| 183 | } |
| 184 | |
| 185 | #endif //std::string compatibility |
| 186 | |
| 187 | extern int WXDLLEXPORT wxVsnprintf(wxChar *buf, size_t len, |
| 188 | const wxChar *format, va_list argptr) |
| 189 | { |
| 190 | #if wxUSE_UNICODE |
| 191 | // FIXME should use wvsnprintf() or whatever if it's available |
| 192 | wxString s; |
| 193 | int iLen = s.PrintfV(format, argptr); |
| 194 | if ( iLen != -1 ) |
| 195 | { |
| 196 | wxStrncpy(buf, s.c_str(), len); |
| 197 | buf[len-1] = wxT('\0'); |
| 198 | } |
| 199 | |
| 200 | return iLen; |
| 201 | #else // ANSI |
| 202 | // vsnprintf() will not terminate the string with '\0' if there is not |
| 203 | // enough place, but we want the string to always be NUL terminated |
| 204 | int rc = wxVsnprintfA(buf, len - 1, format, argptr); |
| 205 | if ( rc == -1 ) |
| 206 | { |
| 207 | buf[len] = 0; |
| 208 | } |
| 209 | |
| 210 | return rc; |
| 211 | #endif // Unicode/ANSI |
| 212 | } |
| 213 | |
| 214 | extern int WXDLLEXPORT wxSnprintf(wxChar *buf, size_t len, |
| 215 | const wxChar *format, ...) |
| 216 | { |
| 217 | va_list argptr; |
| 218 | va_start(argptr, format); |
| 219 | |
| 220 | int iLen = wxVsnprintf(buf, len, format, argptr); |
| 221 | |
| 222 | va_end(argptr); |
| 223 | |
| 224 | return iLen; |
| 225 | } |
| 226 | |
| 227 | // ---------------------------------------------------------------------------- |
| 228 | // private classes |
| 229 | // ---------------------------------------------------------------------------- |
| 230 | |
| 231 | // this small class is used to gather statistics for performance tuning |
| 232 | //#define WXSTRING_STATISTICS |
| 233 | #ifdef WXSTRING_STATISTICS |
| 234 | class Averager |
| 235 | { |
| 236 | public: |
| 237 | Averager(const char *sz) { m_sz = sz; m_nTotal = m_nCount = 0; } |
| 238 | ~Averager() |
| 239 | { printf("wxString: average %s = %f\n", m_sz, ((float)m_nTotal)/m_nCount); } |
| 240 | |
| 241 | void Add(size_t n) { m_nTotal += n; m_nCount++; } |
| 242 | |
| 243 | private: |
| 244 | size_t m_nCount, m_nTotal; |
| 245 | const char *m_sz; |
| 246 | } g_averageLength("allocation size"), |
| 247 | g_averageSummandLength("summand length"), |
| 248 | g_averageConcatHit("hit probability in concat"), |
| 249 | g_averageInitialLength("initial string length"); |
| 250 | |
| 251 | #define STATISTICS_ADD(av, val) g_average##av.Add(val) |
| 252 | #else |
| 253 | #define STATISTICS_ADD(av, val) |
| 254 | #endif // WXSTRING_STATISTICS |
| 255 | |
| 256 | // =========================================================================== |
| 257 | // wxString class core |
| 258 | // =========================================================================== |
| 259 | |
| 260 | // --------------------------------------------------------------------------- |
| 261 | // construction |
| 262 | // --------------------------------------------------------------------------- |
| 263 | |
| 264 | // constructs string of <nLength> copies of character <ch> |
| 265 | wxString::wxString(wxChar ch, size_t nLength) |
| 266 | { |
| 267 | Init(); |
| 268 | |
| 269 | if ( nLength > 0 ) { |
| 270 | AllocBuffer(nLength); |
| 271 | |
| 272 | #if wxUSE_UNICODE |
| 273 | // memset only works on char |
| 274 | for (size_t n=0; n<nLength; n++) m_pchData[n] = ch; |
| 275 | #else |
| 276 | memset(m_pchData, ch, nLength); |
| 277 | #endif |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | // takes nLength elements of psz starting at nPos |
| 282 | void wxString::InitWith(const wxChar *psz, size_t nPos, size_t nLength) |
| 283 | { |
| 284 | Init(); |
| 285 | |
| 286 | // if the length is not given, assume the string to be NUL terminated |
| 287 | if ( nLength == wxSTRING_MAXLEN ) { |
| 288 | wxASSERT_MSG( nPos <= wxStrlen(psz), _T("index out of bounds") ); |
| 289 | |
| 290 | nLength = wxStrlen(psz + nPos); |
| 291 | } |
| 292 | |
| 293 | STATISTICS_ADD(InitialLength, nLength); |
| 294 | |
| 295 | if ( nLength > 0 ) { |
| 296 | // trailing '\0' is written in AllocBuffer() |
| 297 | AllocBuffer(nLength); |
| 298 | memcpy(m_pchData, psz + nPos, nLength*sizeof(wxChar)); |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | #ifdef wxSTD_STRING_COMPATIBILITY |
| 303 | |
| 304 | // poor man's iterators are "void *" pointers |
| 305 | wxString::wxString(const void *pStart, const void *pEnd) |
| 306 | { |
| 307 | InitWith((const wxChar *)pStart, 0, |
| 308 | (const wxChar *)pEnd - (const wxChar *)pStart); |
| 309 | } |
| 310 | |
| 311 | #endif //std::string compatibility |
| 312 | |
| 313 | #if wxUSE_UNICODE |
| 314 | |
| 315 | // from multibyte string |
| 316 | wxString::wxString(const char *psz, wxMBConv& conv, size_t nLength) |
| 317 | { |
| 318 | // first get necessary size |
| 319 | size_t nLen = psz ? conv.MB2WC((wchar_t *) NULL, psz, 0) : 0; |
| 320 | |
| 321 | // nLength is number of *Unicode* characters here! |
| 322 | if ((nLen != (size_t)-1) && (nLen > nLength)) |
| 323 | nLen = nLength; |
| 324 | |
| 325 | // empty? |
| 326 | if ( (nLen != 0) && (nLen != (size_t)-1) ) { |
| 327 | AllocBuffer(nLen); |
| 328 | conv.MB2WC(m_pchData, psz, nLen); |
| 329 | } |
| 330 | else { |
| 331 | Init(); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | #else // ANSI |
| 336 | |
| 337 | #if wxUSE_WCHAR_T |
| 338 | // from wide string |
| 339 | wxString::wxString(const wchar_t *pwz, wxMBConv& conv, size_t nLength) |
| 340 | { |
| 341 | // first get necessary size |
| 342 | size_t nLen = 0; |
| 343 | if (pwz) |
| 344 | { |
| 345 | if (nLength == wxSTRING_MAXLEN) |
| 346 | nLen = conv.WC2MB((char *) NULL, pwz, 0); |
| 347 | else |
| 348 | nLen = nLength; |
| 349 | } |
| 350 | |
| 351 | // empty? |
| 352 | if ( (nLen != 0) && (nLen != (size_t)-1) ) { |
| 353 | AllocBuffer(nLen); |
| 354 | conv.WC2MB(m_pchData, pwz, nLen); |
| 355 | } |
| 356 | else { |
| 357 | Init(); |
| 358 | } |
| 359 | } |
| 360 | #endif // wxUSE_WCHAR_T |
| 361 | |
| 362 | #endif // Unicode/ANSI |
| 363 | |
| 364 | // --------------------------------------------------------------------------- |
| 365 | // memory allocation |
| 366 | // --------------------------------------------------------------------------- |
| 367 | |
| 368 | // allocates memory needed to store a C string of length nLen |
| 369 | void wxString::AllocBuffer(size_t nLen) |
| 370 | { |
| 371 | // allocating 0 sized buffer doesn't make sense, all empty strings should |
| 372 | // reuse g_strEmpty |
| 373 | wxASSERT( nLen > 0 ); |
| 374 | |
| 375 | // make sure that we don't overflow |
| 376 | wxASSERT( nLen < (INT_MAX / sizeof(wxChar)) - |
| 377 | (sizeof(wxStringData) + EXTRA_ALLOC + 1) ); |
| 378 | |
| 379 | STATISTICS_ADD(Length, nLen); |
| 380 | |
| 381 | // allocate memory: |
| 382 | // 1) one extra character for '\0' termination |
| 383 | // 2) sizeof(wxStringData) for housekeeping info |
| 384 | wxStringData* pData = (wxStringData*) |
| 385 | malloc(sizeof(wxStringData) + (nLen + EXTRA_ALLOC + 1)*sizeof(wxChar)); |
| 386 | pData->nRefs = 1; |
| 387 | pData->nDataLength = nLen; |
| 388 | pData->nAllocLength = nLen + EXTRA_ALLOC; |
| 389 | m_pchData = pData->data(); // data starts after wxStringData |
| 390 | m_pchData[nLen] = wxT('\0'); |
| 391 | } |
| 392 | |
| 393 | // must be called before changing this string |
| 394 | void wxString::CopyBeforeWrite() |
| 395 | { |
| 396 | wxStringData* pData = GetStringData(); |
| 397 | |
| 398 | if ( pData->IsShared() ) { |
| 399 | pData->Unlock(); // memory not freed because shared |
| 400 | size_t nLen = pData->nDataLength; |
| 401 | AllocBuffer(nLen); |
| 402 | memcpy(m_pchData, pData->data(), nLen*sizeof(wxChar)); |
| 403 | } |
| 404 | |
| 405 | wxASSERT( !GetStringData()->IsShared() ); // we must be the only owner |
| 406 | } |
| 407 | |
| 408 | // must be called before replacing contents of this string |
| 409 | void wxString::AllocBeforeWrite(size_t nLen) |
| 410 | { |
| 411 | wxASSERT( nLen != 0 ); // doesn't make any sense |
| 412 | |
| 413 | // must not share string and must have enough space |
| 414 | wxStringData* pData = GetStringData(); |
| 415 | if ( pData->IsShared() || pData->IsEmpty() ) { |
| 416 | // can't work with old buffer, get new one |
| 417 | pData->Unlock(); |
| 418 | AllocBuffer(nLen); |
| 419 | } |
| 420 | else { |
| 421 | if ( nLen > pData->nAllocLength ) { |
| 422 | // realloc the buffer instead of calling malloc() again, this is more |
| 423 | // efficient |
| 424 | STATISTICS_ADD(Length, nLen); |
| 425 | |
| 426 | nLen += EXTRA_ALLOC; |
| 427 | |
| 428 | wxStringData *pDataOld = pData; |
| 429 | pData = (wxStringData*) |
| 430 | realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar)); |
| 431 | if ( !pData ) { |
| 432 | // out of memory |
| 433 | free(pDataOld); |
| 434 | |
| 435 | // FIXME we're going to crash... |
| 436 | return; |
| 437 | } |
| 438 | |
| 439 | pData->nAllocLength = nLen; |
| 440 | m_pchData = pData->data(); |
| 441 | } |
| 442 | |
| 443 | // now we have enough space, just update the string length |
| 444 | pData->nDataLength = nLen; |
| 445 | } |
| 446 | |
| 447 | wxASSERT( !GetStringData()->IsShared() ); // we must be the only owner |
| 448 | } |
| 449 | |
| 450 | // allocate enough memory for nLen characters |
| 451 | void wxString::Alloc(size_t nLen) |
| 452 | { |
| 453 | wxStringData *pData = GetStringData(); |
| 454 | if ( pData->nAllocLength <= nLen ) { |
| 455 | if ( pData->IsEmpty() ) { |
| 456 | nLen += EXTRA_ALLOC; |
| 457 | |
| 458 | wxStringData* pData = (wxStringData*) |
| 459 | malloc(sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar)); |
| 460 | pData->nRefs = 1; |
| 461 | pData->nDataLength = 0; |
| 462 | pData->nAllocLength = nLen; |
| 463 | m_pchData = pData->data(); // data starts after wxStringData |
| 464 | m_pchData[0u] = wxT('\0'); |
| 465 | } |
| 466 | else if ( pData->IsShared() ) { |
| 467 | pData->Unlock(); // memory not freed because shared |
| 468 | size_t nOldLen = pData->nDataLength; |
| 469 | AllocBuffer(nLen); |
| 470 | memcpy(m_pchData, pData->data(), nOldLen*sizeof(wxChar)); |
| 471 | } |
| 472 | else { |
| 473 | nLen += EXTRA_ALLOC; |
| 474 | |
| 475 | wxStringData *pDataOld = pData; |
| 476 | wxStringData *p = (wxStringData *) |
| 477 | realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar)); |
| 478 | |
| 479 | if ( p == NULL ) { |
| 480 | // don't leak memory |
| 481 | free(pDataOld); |
| 482 | |
| 483 | // FIXME what to do on memory error? |
| 484 | return; |
| 485 | } |
| 486 | |
| 487 | // it's not important if the pointer changed or not (the check for this |
| 488 | // is not faster than assigning to m_pchData in all cases) |
| 489 | p->nAllocLength = nLen; |
| 490 | m_pchData = p->data(); |
| 491 | } |
| 492 | } |
| 493 | //else: we've already got enough |
| 494 | } |
| 495 | |
| 496 | // shrink to minimal size (releasing extra memory) |
| 497 | void wxString::Shrink() |
| 498 | { |
| 499 | wxStringData *pData = GetStringData(); |
| 500 | |
| 501 | size_t nLen = pData->nDataLength; |
| 502 | void *p = realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar)); |
| 503 | |
| 504 | wxASSERT_MSG( p != NULL, _T("can't free memory?") ); |
| 505 | |
| 506 | if ( p != pData ) |
| 507 | { |
| 508 | // contrary to what one might believe, some realloc() implementation do |
| 509 | // move the memory block even when its size is reduced |
| 510 | pData = (wxStringData *)p; |
| 511 | |
| 512 | m_pchData = pData->data(); |
| 513 | } |
| 514 | |
| 515 | pData->nAllocLength = nLen; |
| 516 | } |
| 517 | |
| 518 | // get the pointer to writable buffer of (at least) nLen bytes |
| 519 | wxChar *wxString::GetWriteBuf(size_t nLen) |
| 520 | { |
| 521 | AllocBeforeWrite(nLen); |
| 522 | |
| 523 | wxASSERT( GetStringData()->nRefs == 1 ); |
| 524 | GetStringData()->Validate(FALSE); |
| 525 | |
| 526 | return m_pchData; |
| 527 | } |
| 528 | |
| 529 | // put string back in a reasonable state after GetWriteBuf |
| 530 | void wxString::UngetWriteBuf() |
| 531 | { |
| 532 | GetStringData()->nDataLength = wxStrlen(m_pchData); |
| 533 | GetStringData()->Validate(TRUE); |
| 534 | } |
| 535 | |
| 536 | void wxString::UngetWriteBuf(size_t nLen) |
| 537 | { |
| 538 | GetStringData()->nDataLength = nLen; |
| 539 | GetStringData()->Validate(TRUE); |
| 540 | } |
| 541 | |
| 542 | // --------------------------------------------------------------------------- |
| 543 | // data access |
| 544 | // --------------------------------------------------------------------------- |
| 545 | |
| 546 | // all functions are inline in string.h |
| 547 | |
| 548 | // --------------------------------------------------------------------------- |
| 549 | // assignment operators |
| 550 | // --------------------------------------------------------------------------- |
| 551 | |
| 552 | // helper function: does real copy |
| 553 | void wxString::AssignCopy(size_t nSrcLen, const wxChar *pszSrcData) |
| 554 | { |
| 555 | if ( nSrcLen == 0 ) { |
| 556 | Reinit(); |
| 557 | } |
| 558 | else { |
| 559 | AllocBeforeWrite(nSrcLen); |
| 560 | memcpy(m_pchData, pszSrcData, nSrcLen*sizeof(wxChar)); |
| 561 | GetStringData()->nDataLength = nSrcLen; |
| 562 | m_pchData[nSrcLen] = wxT('\0'); |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | // assigns one string to another |
| 567 | wxString& wxString::operator=(const wxString& stringSrc) |
| 568 | { |
| 569 | wxASSERT( stringSrc.GetStringData()->IsValid() ); |
| 570 | |
| 571 | // don't copy string over itself |
| 572 | if ( m_pchData != stringSrc.m_pchData ) { |
| 573 | if ( stringSrc.GetStringData()->IsEmpty() ) { |
| 574 | Reinit(); |
| 575 | } |
| 576 | else { |
| 577 | // adjust references |
| 578 | GetStringData()->Unlock(); |
| 579 | m_pchData = stringSrc.m_pchData; |
| 580 | GetStringData()->Lock(); |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | return *this; |
| 585 | } |
| 586 | |
| 587 | // assigns a single character |
| 588 | wxString& wxString::operator=(wxChar ch) |
| 589 | { |
| 590 | AssignCopy(1, &ch); |
| 591 | return *this; |
| 592 | } |
| 593 | |
| 594 | |
| 595 | // assigns C string |
| 596 | wxString& wxString::operator=(const wxChar *psz) |
| 597 | { |
| 598 | AssignCopy(wxStrlen(psz), psz); |
| 599 | return *this; |
| 600 | } |
| 601 | |
| 602 | #if !wxUSE_UNICODE |
| 603 | |
| 604 | // same as 'signed char' variant |
| 605 | wxString& wxString::operator=(const unsigned char* psz) |
| 606 | { |
| 607 | *this = (const char *)psz; |
| 608 | return *this; |
| 609 | } |
| 610 | |
| 611 | #if wxUSE_WCHAR_T |
| 612 | wxString& wxString::operator=(const wchar_t *pwz) |
| 613 | { |
| 614 | wxString str(pwz); |
| 615 | *this = str; |
| 616 | return *this; |
| 617 | } |
| 618 | #endif |
| 619 | |
| 620 | #endif |
| 621 | |
| 622 | // --------------------------------------------------------------------------- |
| 623 | // string concatenation |
| 624 | // --------------------------------------------------------------------------- |
| 625 | |
| 626 | // add something to this string |
| 627 | void wxString::ConcatSelf(int nSrcLen, const wxChar *pszSrcData) |
| 628 | { |
| 629 | STATISTICS_ADD(SummandLength, nSrcLen); |
| 630 | |
| 631 | // concatenating an empty string is a NOP |
| 632 | if ( nSrcLen > 0 ) { |
| 633 | wxStringData *pData = GetStringData(); |
| 634 | size_t nLen = pData->nDataLength; |
| 635 | size_t nNewLen = nLen + nSrcLen; |
| 636 | |
| 637 | // alloc new buffer if current is too small |
| 638 | if ( pData->IsShared() ) { |
| 639 | STATISTICS_ADD(ConcatHit, 0); |
| 640 | |
| 641 | // we have to allocate another buffer |
| 642 | wxStringData* pOldData = GetStringData(); |
| 643 | AllocBuffer(nNewLen); |
| 644 | memcpy(m_pchData, pOldData->data(), nLen*sizeof(wxChar)); |
| 645 | pOldData->Unlock(); |
| 646 | } |
| 647 | else if ( nNewLen > pData->nAllocLength ) { |
| 648 | STATISTICS_ADD(ConcatHit, 0); |
| 649 | |
| 650 | // we have to grow the buffer |
| 651 | Alloc(nNewLen); |
| 652 | } |
| 653 | else { |
| 654 | STATISTICS_ADD(ConcatHit, 1); |
| 655 | |
| 656 | // the buffer is already big enough |
| 657 | } |
| 658 | |
| 659 | // should be enough space |
| 660 | wxASSERT( nNewLen <= GetStringData()->nAllocLength ); |
| 661 | |
| 662 | // fast concatenation - all is done in our buffer |
| 663 | memcpy(m_pchData + nLen, pszSrcData, nSrcLen*sizeof(wxChar)); |
| 664 | |
| 665 | m_pchData[nNewLen] = wxT('\0'); // put terminating '\0' |
| 666 | GetStringData()->nDataLength = nNewLen; // and fix the length |
| 667 | } |
| 668 | //else: the string to append was empty |
| 669 | } |
| 670 | |
| 671 | /* |
| 672 | * concatenation functions come in 5 flavours: |
| 673 | * string + string |
| 674 | * char + string and string + char |
| 675 | * C str + string and string + C str |
| 676 | */ |
| 677 | |
| 678 | wxString operator+(const wxString& string1, const wxString& string2) |
| 679 | { |
| 680 | wxASSERT( string1.GetStringData()->IsValid() ); |
| 681 | wxASSERT( string2.GetStringData()->IsValid() ); |
| 682 | |
| 683 | wxString s = string1; |
| 684 | s += string2; |
| 685 | |
| 686 | return s; |
| 687 | } |
| 688 | |
| 689 | wxString operator+(const wxString& string, wxChar ch) |
| 690 | { |
| 691 | wxASSERT( string.GetStringData()->IsValid() ); |
| 692 | |
| 693 | wxString s = string; |
| 694 | s += ch; |
| 695 | |
| 696 | return s; |
| 697 | } |
| 698 | |
| 699 | wxString operator+(wxChar ch, const wxString& string) |
| 700 | { |
| 701 | wxASSERT( string.GetStringData()->IsValid() ); |
| 702 | |
| 703 | wxString s = ch; |
| 704 | s += string; |
| 705 | |
| 706 | return s; |
| 707 | } |
| 708 | |
| 709 | wxString operator+(const wxString& string, const wxChar *psz) |
| 710 | { |
| 711 | wxASSERT( string.GetStringData()->IsValid() ); |
| 712 | |
| 713 | wxString s; |
| 714 | s.Alloc(wxStrlen(psz) + string.Len()); |
| 715 | s = string; |
| 716 | s += psz; |
| 717 | |
| 718 | return s; |
| 719 | } |
| 720 | |
| 721 | wxString operator+(const wxChar *psz, const wxString& string) |
| 722 | { |
| 723 | wxASSERT( string.GetStringData()->IsValid() ); |
| 724 | |
| 725 | wxString s; |
| 726 | s.Alloc(wxStrlen(psz) + string.Len()); |
| 727 | s = psz; |
| 728 | s += string; |
| 729 | |
| 730 | return s; |
| 731 | } |
| 732 | |
| 733 | // =========================================================================== |
| 734 | // other common string functions |
| 735 | // =========================================================================== |
| 736 | |
| 737 | // --------------------------------------------------------------------------- |
| 738 | // simple sub-string extraction |
| 739 | // --------------------------------------------------------------------------- |
| 740 | |
| 741 | // helper function: clone the data attached to this string |
| 742 | void wxString::AllocCopy(wxString& dest, int nCopyLen, int nCopyIndex) const |
| 743 | { |
| 744 | if ( nCopyLen == 0 ) { |
| 745 | dest.Init(); |
| 746 | } |
| 747 | else { |
| 748 | dest.AllocBuffer(nCopyLen); |
| 749 | memcpy(dest.m_pchData, m_pchData + nCopyIndex, nCopyLen*sizeof(wxChar)); |
| 750 | } |
| 751 | } |
| 752 | |
| 753 | // extract string of length nCount starting at nFirst |
| 754 | wxString wxString::Mid(size_t nFirst, size_t nCount) const |
| 755 | { |
| 756 | wxStringData *pData = GetStringData(); |
| 757 | size_t nLen = pData->nDataLength; |
| 758 | |
| 759 | // default value of nCount is wxSTRING_MAXLEN and means "till the end" |
| 760 | if ( nCount == wxSTRING_MAXLEN ) |
| 761 | { |
| 762 | nCount = nLen - nFirst; |
| 763 | } |
| 764 | |
| 765 | // out-of-bounds requests return sensible things |
| 766 | if ( nFirst + nCount > nLen ) |
| 767 | { |
| 768 | nCount = nLen - nFirst; |
| 769 | } |
| 770 | |
| 771 | if ( nFirst > nLen ) |
| 772 | { |
| 773 | // AllocCopy() will return empty string |
| 774 | nCount = 0; |
| 775 | } |
| 776 | |
| 777 | wxString dest; |
| 778 | AllocCopy(dest, nCount, nFirst); |
| 779 | |
| 780 | return dest; |
| 781 | } |
| 782 | |
| 783 | // check that the tring starts with prefix and return the rest of the string |
| 784 | // in the provided pointer if it is not NULL, otherwise return FALSE |
| 785 | bool wxString::StartsWith(const wxChar *prefix, wxString *rest) const |
| 786 | { |
| 787 | wxASSERT_MSG( prefix, _T("invalid parameter in wxString::StartsWith") ); |
| 788 | |
| 789 | // first check if the beginning of the string matches the prefix: note |
| 790 | // that we don't have to check that we don't run out of this string as |
| 791 | // when we reach the terminating NUL, either prefix string ends too (and |
| 792 | // then it's ok) or we break out of the loop because there is no match |
| 793 | const wxChar *p = c_str(); |
| 794 | while ( *prefix ) |
| 795 | { |
| 796 | if ( *prefix++ != *p++ ) |
| 797 | { |
| 798 | // no match |
| 799 | return FALSE; |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | if ( rest ) |
| 804 | { |
| 805 | // put the rest of the string into provided pointer |
| 806 | *rest = p; |
| 807 | } |
| 808 | |
| 809 | return TRUE; |
| 810 | } |
| 811 | |
| 812 | // extract nCount last (rightmost) characters |
| 813 | wxString wxString::Right(size_t nCount) const |
| 814 | { |
| 815 | if ( nCount > (size_t)GetStringData()->nDataLength ) |
| 816 | nCount = GetStringData()->nDataLength; |
| 817 | |
| 818 | wxString dest; |
| 819 | AllocCopy(dest, nCount, GetStringData()->nDataLength - nCount); |
| 820 | return dest; |
| 821 | } |
| 822 | |
| 823 | // get all characters after the last occurence of ch |
| 824 | // (returns the whole string if ch not found) |
| 825 | wxString wxString::AfterLast(wxChar ch) const |
| 826 | { |
| 827 | wxString str; |
| 828 | int iPos = Find(ch, TRUE); |
| 829 | if ( iPos == wxNOT_FOUND ) |
| 830 | str = *this; |
| 831 | else |
| 832 | str = c_str() + iPos + 1; |
| 833 | |
| 834 | return str; |
| 835 | } |
| 836 | |
| 837 | // extract nCount first (leftmost) characters |
| 838 | wxString wxString::Left(size_t nCount) const |
| 839 | { |
| 840 | if ( nCount > (size_t)GetStringData()->nDataLength ) |
| 841 | nCount = GetStringData()->nDataLength; |
| 842 | |
| 843 | wxString dest; |
| 844 | AllocCopy(dest, nCount, 0); |
| 845 | return dest; |
| 846 | } |
| 847 | |
| 848 | // get all characters before the first occurence of ch |
| 849 | // (returns the whole string if ch not found) |
| 850 | wxString wxString::BeforeFirst(wxChar ch) const |
| 851 | { |
| 852 | wxString str; |
| 853 | for ( const wxChar *pc = m_pchData; *pc != wxT('\0') && *pc != ch; pc++ ) |
| 854 | str += *pc; |
| 855 | |
| 856 | return str; |
| 857 | } |
| 858 | |
| 859 | /// get all characters before the last occurence of ch |
| 860 | /// (returns empty string if ch not found) |
| 861 | wxString wxString::BeforeLast(wxChar ch) const |
| 862 | { |
| 863 | wxString str; |
| 864 | int iPos = Find(ch, TRUE); |
| 865 | if ( iPos != wxNOT_FOUND && iPos != 0 ) |
| 866 | str = wxString(c_str(), iPos); |
| 867 | |
| 868 | return str; |
| 869 | } |
| 870 | |
| 871 | /// get all characters after the first occurence of ch |
| 872 | /// (returns empty string if ch not found) |
| 873 | wxString wxString::AfterFirst(wxChar ch) const |
| 874 | { |
| 875 | wxString str; |
| 876 | int iPos = Find(ch); |
| 877 | if ( iPos != wxNOT_FOUND ) |
| 878 | str = c_str() + iPos + 1; |
| 879 | |
| 880 | return str; |
| 881 | } |
| 882 | |
| 883 | // replace first (or all) occurences of some substring with another one |
| 884 | size_t wxString::Replace(const wxChar *szOld, const wxChar *szNew, bool bReplaceAll) |
| 885 | { |
| 886 | size_t uiCount = 0; // count of replacements made |
| 887 | |
| 888 | size_t uiOldLen = wxStrlen(szOld); |
| 889 | |
| 890 | wxString strTemp; |
| 891 | const wxChar *pCurrent = m_pchData; |
| 892 | const wxChar *pSubstr; |
| 893 | while ( *pCurrent != wxT('\0') ) { |
| 894 | pSubstr = wxStrstr(pCurrent, szOld); |
| 895 | if ( pSubstr == NULL ) { |
| 896 | // strTemp is unused if no replacements were made, so avoid the copy |
| 897 | if ( uiCount == 0 ) |
| 898 | return 0; |
| 899 | |
| 900 | strTemp += pCurrent; // copy the rest |
| 901 | break; // exit the loop |
| 902 | } |
| 903 | else { |
| 904 | // take chars before match |
| 905 | strTemp.ConcatSelf(pSubstr - pCurrent, pCurrent); |
| 906 | strTemp += szNew; |
| 907 | pCurrent = pSubstr + uiOldLen; // restart after match |
| 908 | |
| 909 | uiCount++; |
| 910 | |
| 911 | // stop now? |
| 912 | if ( !bReplaceAll ) { |
| 913 | strTemp += pCurrent; // copy the rest |
| 914 | break; // exit the loop |
| 915 | } |
| 916 | } |
| 917 | } |
| 918 | |
| 919 | // only done if there were replacements, otherwise would have returned above |
| 920 | *this = strTemp; |
| 921 | |
| 922 | return uiCount; |
| 923 | } |
| 924 | |
| 925 | bool wxString::IsAscii() const |
| 926 | { |
| 927 | const wxChar *s = (const wxChar*) *this; |
| 928 | while(*s){ |
| 929 | if(!isascii(*s)) return(FALSE); |
| 930 | s++; |
| 931 | } |
| 932 | return(TRUE); |
| 933 | } |
| 934 | |
| 935 | bool wxString::IsWord() const |
| 936 | { |
| 937 | const wxChar *s = (const wxChar*) *this; |
| 938 | while(*s){ |
| 939 | if(!wxIsalpha(*s)) return(FALSE); |
| 940 | s++; |
| 941 | } |
| 942 | return(TRUE); |
| 943 | } |
| 944 | |
| 945 | bool wxString::IsNumber() const |
| 946 | { |
| 947 | const wxChar *s = (const wxChar*) *this; |
| 948 | if (wxStrlen(s)) |
| 949 | if ((s[0] == '-') || (s[0] == '+')) s++; |
| 950 | while(*s){ |
| 951 | if(!wxIsdigit(*s)) return(FALSE); |
| 952 | s++; |
| 953 | } |
| 954 | return(TRUE); |
| 955 | } |
| 956 | |
| 957 | wxString wxString::Strip(stripType w) const |
| 958 | { |
| 959 | wxString s = *this; |
| 960 | if ( w & leading ) s.Trim(FALSE); |
| 961 | if ( w & trailing ) s.Trim(TRUE); |
| 962 | return s; |
| 963 | } |
| 964 | |
| 965 | // --------------------------------------------------------------------------- |
| 966 | // case conversion |
| 967 | // --------------------------------------------------------------------------- |
| 968 | |
| 969 | wxString& wxString::MakeUpper() |
| 970 | { |
| 971 | CopyBeforeWrite(); |
| 972 | |
| 973 | for ( wxChar *p = m_pchData; *p; p++ ) |
| 974 | *p = (wxChar)wxToupper(*p); |
| 975 | |
| 976 | return *this; |
| 977 | } |
| 978 | |
| 979 | wxString& wxString::MakeLower() |
| 980 | { |
| 981 | CopyBeforeWrite(); |
| 982 | |
| 983 | for ( wxChar *p = m_pchData; *p; p++ ) |
| 984 | *p = (wxChar)wxTolower(*p); |
| 985 | |
| 986 | return *this; |
| 987 | } |
| 988 | |
| 989 | // --------------------------------------------------------------------------- |
| 990 | // trimming and padding |
| 991 | // --------------------------------------------------------------------------- |
| 992 | |
| 993 | // some compilers (VC++ 6.0 not to name them) return TRUE for a call to |
| 994 |