memory/string.c

   1 /*
   2  * String functions
   3  *
   4  * Copyright 1993 Yngvi Sigurjonsson
   5  * Copyright 1996 Alexandre Julliard
   6  */
   7
   8 #include <ctype.h>
   9 #include <string.h>
  10
  11 #include "wine/winbase16.h"
  12 #include "wine/winuser16.h"
  13 #include "winbase.h"
  14 #include "winuser.h"
  15 #include "wine/keyboard16.h"
  16 #include "wine/exception.h"
  17 #include "winerror.h"
  18 #include "crtdll.h"
  19 #include "ldt.h"
  20 #include "debugtools.h"
  21 #include "winnls.h"
  22
  23 DEFAULT_DEBUG_CHANNEL(string)
  24
  25 static const BYTE STRING_Oem2Ansi[256] =
  26 "\000\001\002\003\004\005\006\007\010\011\012\013\014\015\016\244"
  27 "\020\021\022\023\266\247\026\027\030\031\032\033\034\035\036\037"
  28 "\040\041\042\043\044\045\046\047\050\051\052\053\054\055\056\057"
  29 "\060\061\062\063\064\065\066\067\070\071\072\073\074\075\076\077"
  30 "\100\101\102\103\104\105\106\107\110\111\112\113\114\115\116\117"
  31 "\120\121\122\123\124\125\126\127\130\131\132\133\134\135\136\137"
  32 "\140\141\142\143\144\145\146\147\150\151\152\153\154\155\156\157"
  33 "\160\161\162\163\164\165\166\167\170\171\172\173\174\175\176\177"
  34 "\307\374\351\342\344\340\345\347\352\353\350\357\356\354\304\305"
  35 "\311\346\306\364\366\362\373\371\377\326\334\242\243\245\120\203"
  36 "\341\355\363\372\361\321\252\272\277\137\254\275\274\241\253\273"
  37 "\137\137\137\246\246\246\246\053\053\246\246\053\053\053\053\053"
  38 "\053\055\055\053\055\053\246\246\053\053\055\055\246\055\053\055"
  39 "\055\055\055\053\053\053\053\053\053\053\053\137\137\246\137\137"
  40 "\137\337\137\266\137\137\265\137\137\137\137\137\137\137\137\137"
  41 "\137\261\137\137\137\137\367\137\260\225\267\137\156\262\137\137";
  42
  43 static const BYTE STRING_Ansi2Oem[256] =
  44 "\000\001\002\003\004\005\006\007\010\011\012\013\014\015\016\017"
  45 "\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037"
  46 "\040\041\042\043\044\045\046\047\050\051\052\053\054\055\056\057"
  47 "\060\061\062\063\064\065\066\067\070\071\072\073\074\075\076\077"
  48 "\100\101\102\103\104\105\106\107\110\111\112\113\114\115\116\117"
  49 "\120\121\122\123\124\125\126\127\130\131\132\133\134\135\136\137"
  50 "\140\141\142\143\144\145\146\147\150\151\152\153\154\155\156\157"
  51 "\160\161\162\163\164\165\166\167\170\171\172\173\174\175\176\177"
  52 "\200\201\054\237\054\137\375\374\210\045\123\074\117\215\216\217"
  53 "\220\140\047\042\042\371\055\137\230\231\163\076\157\235\236\131"
  54 "\040\255\233\234\017\235\335\025\042\143\246\256\252\055\162\137"
  55 "\370\361\375\063\047\346\024\372\054\061\247\257\254\253\137\250"
  56 "\101\101\101\101\216\217\222\200\105\220\105\105\111\111\111\111"
  57 "\104\245\117\117\117\117\231\170\117\125\125\125\232\131\137\341"
  58 "\205\240\203\141\204\206\221\207\212\202\210\211\215\241\214\213"
  59 "\144\244\225\242\223\157\224\366\157\227\243\226\201\171\137\230";
  60
  61 #define OEM_TO_ANSI(ch) (STRING_Oem2Ansi[(unsigned char)(ch)])
  62 #define ANSI_TO_OEM(ch) (STRING_Ansi2Oem[(unsigned char)(ch)])
  63
  64 /* Internaly used by strchr family functions */
  65 static BOOL ChrCmpA( WORD word1, WORD word2);
  66
  67
  68 /* filter for page-fault exceptions */
  69 static WINE_EXCEPTION_FILTER(page_fault)
  70 {
  71     if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION)
  72         return EXCEPTION_EXECUTE_HANDLER;
  73     return EXCEPTION_CONTINUE_SEARCH;
  74 }
  75
  76
  77 /***********************************************************************
  78  *           hmemcpy   (KERNEL.348)
  79  */
  80 void WINAPI hmemcpy16( LPVOID dst, LPCVOID src, LONG count )
  81 {
  82     memcpy( dst, src, count );
  83 }
  84
  85
  86 /***********************************************************************
  87  *           lstrcat16   (KERNEL.89)
  88  */
  89 SEGPTR WINAPI lstrcat16( SEGPTR dst, LPCSTR src )
  90 {
  91     /* Windows does not check for NULL pointers here, so we don't either */
  92     strcat( (LPSTR)PTR_SEG_TO_LIN(dst), src );
  93     return dst;
  94 }
  95
  96
  97 /***********************************************************************
  98  *           lstrcatA   (KERNEL32.599)
  99  */
 100 LPSTR WINAPI lstrcatA( LPSTR dst, LPCSTR src )
 101 {
 102     __TRY
 103     {
 104         strcat( dst, src );
 105     }
 106     __EXCEPT(page_fault)
 107     {
 108         SetLastError( ERROR_INVALID_PARAMETER );
 109         return NULL;
 110     }
 111     __ENDTRY
 112     return dst;
 113 }
 114
 115
 116 /***********************************************************************
 117  *           lstrcatW   (KERNEL32.600)
 118  */
 119 LPWSTR WINAPI lstrcatW( LPWSTR dst, LPCWSTR src )
 120 {
 121     __TRY
 122     {
 123         CRTDLL_wcscat( dst, src );
 124     }
 125     __EXCEPT(page_fault)
 126     {
 127         SetLastError( ERROR_INVALID_PARAMETER );
 128         return NULL;
 129     }
 130     __ENDTRY
 131     return dst;
 132 }
 133
 134
 135 /***********************************************************************
 136  *           lstrcatn16   (KERNEL.352)
 137  */
 138 SEGPTR WINAPI lstrcatn16( SEGPTR dst, LPCSTR src, INT16 n )
 139 {
 140     LPSTR p = (LPSTR)PTR_SEG_TO_LIN(dst);
 141
 142     while (*p) p++;
 143     if ((n -= (p - (LPSTR)PTR_SEG_TO_LIN(dst))) <= 0) return dst;
 144     lstrcpynA( p, src, n );
 145     return dst;
 146 }
 147
 148
 149 /***********************************************************************
 150  *           lstrcmp16   (USER.430)
 151  */
 152 INT16 WINAPI lstrcmp16( LPCSTR str1, LPCSTR str2 )
 153 {
 154     return (INT16)strcmp( str1, str2 );
 155 }
 156
 157
 158 /***********************************************************************
 159  *           lstrcmp32A   (KERNEL.602)
 160  */
 161 INT WINAPI lstrcmpA( LPCSTR str1, LPCSTR str2 )
 162 {
 163     return CompareStringA(LOCALE_SYSTEM_DEFAULT,0,str1,-1,str2,-1) - 2 ;
 164 }
 165
 166
 167 /***********************************************************************
 168  *           lstrcmp32W   (KERNEL.603)
 169  * FIXME : should call CompareString32W, when it is implemented.
 170  *    This implementation is not "word sort", as it should.
 171  */
 172 INT WINAPI lstrcmpW( LPCWSTR str1, LPCWSTR str2 )
 173 {
 174     TRACE("L%s and L%s\n",
 175                    debugstr_w (str1), debugstr_w (str2));
 176     if (!str1 || !str2) {
 177         SetLastError(ERROR_INVALID_PARAMETER);
 178         return 0;
 179     }
 180     while (*str1 && (*str1 == *str2)) { str1++; str2++; }
 181     return (INT)(*str1 - *str2);
 182 }
 183
 184
 185 /***********************************************************************
 186  *           lstrcmpi16   (USER.471)
 187  */
 188 INT16 WINAPI lstrcmpi16( LPCSTR str1, LPCSTR str2 )
 189 {
 190     return (INT16)lstrcmpiA( str1, str2 );
 191 }
 192
 193
 194 /***********************************************************************
 195  *           lstrcmpi32A   (KERNEL32.605)
 196  */
 197 INT WINAPI lstrcmpiA( LPCSTR str1, LPCSTR str2 )
 198 {    TRACE("strcmpi %s and %s\n",
 199                    debugstr_a (str1), debugstr_a (str2));
 200     return CompareStringA(LOCALE_SYSTEM_DEFAULT,NORM_IGNORECASE,str1,-1,str2,-1)-2;
 201 }
 202
 203
 204 /***********************************************************************
 205  *           lstrcmpi32W   (KERNEL32.606)
 206  */
 207 INT WINAPI lstrcmpiW( LPCWSTR str1, LPCWSTR str2 )
 208 {
 209     INT res;
 210
 211 #if 0
 212     /* Too much!  (From registry loading.)  */
 213     TRACE("strcmpi L%s and L%s\n",
 214                    debugstr_w (str1), debugstr_w (str2));
 215 #endif
 216     if (!str1 || !str2) {
 217         SetLastError(ERROR_INVALID_PARAMETER);
 218         return 0;
 219     }
 220     while (*str1)
 221     {
 222         if ((*str1<0x100 ) && (*str2<0x100)) {
 223             if ((res = toupper(*str1) - toupper(*str2)) != 0) return res;
 224         } else {
 225             if ((res = towupper(*str1) - towupper(*str2)) != 0) return res;
 226         }
 227         str1++;
 228         str2++;
 229     }
 230     return towupper(*str1) - towupper(*str2);
 231 }
 232
 233
 234 /***********************************************************************
 235  *           lstrcpy16   (KERNEL.88)
 236  */
 237 SEGPTR WINAPI lstrcpy16( SEGPTR dst, LPCSTR src )
 238 {
 239     /* this is how Windows does it */
 240     memmove( (LPSTR)PTR_SEG_TO_LIN(dst), src, strlen(src)+1 );
 241     return dst;
 242 }
 243
 244
 245 /***********************************************************************
 246  *           lstrcpyA   (KERNEL32.608)
 247  */
 248 LPSTR WINAPI lstrcpyA( LPSTR dst, LPCSTR src )
 249 {
 250     __TRY
 251     {
 252         /* this is how Windows does it */
 253         memmove( dst, src, strlen(src)+1 );
 254     }
 255     __EXCEPT(page_fault)
 256     {
 257         SetLastError( ERROR_INVALID_PARAMETER );
 258         return NULL;
 259     }
 260     __ENDTRY
 261     return dst;
 262 }
 263
 264
 265 /***********************************************************************
 266  *           lstrcpyW   (KERNEL32.609)
 267  */
 268 LPWSTR WINAPI lstrcpyW( LPWSTR dst, LPCWSTR src )
 269 {
 270     __TRY
 271     {
 272         CRTDLL_wcscpy( dst, src );
 273     }
 274     __EXCEPT(page_fault)
 275     {
 276         SetLastError( ERROR_INVALID_PARAMETER );
 277         return NULL;
 278     }
 279     __ENDTRY
 280     return dst;
 281 }
 282
 283
 284 /***********************************************************************
 285  *           lstrcpyn16   (KERNEL.353)
 286  */
 287 SEGPTR WINAPI lstrcpyn16( SEGPTR dst, LPCSTR src, INT16 n )
 288 {
 289     lstrcpynA( (LPSTR)PTR_SEG_TO_LIN(dst), src, n );
 290     return dst;
 291 }
 292
 293
 294 /***********************************************************************
 295  *           lstrcpyn32A   (KERNEL32.611)
 296  * Note: this function differs from the UNIX strncpy, it _always_ writes
 297  * a terminating \0
 298  */
 299 LPSTR WINAPI lstrcpynA( LPSTR dst, LPCSTR src, INT n )
 300 {
 301     LPSTR p = dst;
 302     TRACE("strcpyn %s for %d chars\n",
 303                    debugstr_an (src,n), n);
 304     /* In real windows the whole function is protected by an exception handler
 305      * that returns ERROR_INVALID_PARAMETER on faulty parameters
 306      * We currently just check for NULL.
 307      */
 308     if (!dst || !src) {
 309         SetLastError(ERROR_INVALID_PARAMETER);
 310         return 0;
 311     }
 312     while ((n-- > 1) && *src) *p++ = *src++;
 313     if (n >= 0) *p = 0;
 314     return dst;
 315 }
 316
 317
 318 /***********************************************************************
 319  *           lstrcpyn32W   (KERNEL32.612)
 320  * Note: this function differs from the UNIX strncpy, it _always_ writes
 321  * a terminating \0
 322  */
 323 LPWSTR WINAPI lstrcpynW( LPWSTR dst, LPCWSTR src, INT n )
 324 {
 325     LPWSTR p = dst;
 326     TRACE("strcpyn L%s for %d chars\n",
 327                    debugstr_wn (src,n), n);
 328     /* In real windows the whole function is protected by an exception handler
 329      * that returns ERROR_INVALID_PARAMETER on faulty parameters
 330      * We currently just check for NULL.
 331      */
 332     if (!dst || !src) {
 333         SetLastError(ERROR_INVALID_PARAMETER);
 334         return 0;
 335     }
 336     while ((n-- > 1) && *src) *p++ = *src++;
 337     if (n >= 0) *p = 0;
 338     return dst;
 339 }
 340
 341
 342 /***********************************************************************
 343  *           lstrlen16   (KERNEL.90)
 344  */
 345 INT16 WINAPI lstrlen16( LPCSTR str )
 346 {
 347     return (INT16)lstrlenA( str );
 348 }
 349
 350
 351 /***********************************************************************
 352  *           lstrlenA   (KERNEL32.614)
 353  */
 354 INT WINAPI lstrlenA( LPCSTR str )
 355 {
 356     INT ret;
 357     __TRY
 358     {
 359         ret = strlen(str);
 360     }
 361     __EXCEPT(page_fault)
 362     {
 363         SetLastError( ERROR_INVALID_PARAMETER );
 364         return 0;
 365     }
 366     __ENDTRY
 367     return ret;
 368 }
 369
 370
 371 /***********************************************************************
 372  *           lstrlenW   (KERNEL32.615)
 373  */
 374 INT WINAPI lstrlenW( LPCWSTR str )
 375 {
 376     INT ret;
 377     __TRY
 378     {
 379         ret = CRTDLL_wcslen(str);
 380     }
 381     __EXCEPT(page_fault)
 382     {
 383         SetLastError( ERROR_INVALID_PARAMETER );
 384         return 0;
 385     }
 386     __ENDTRY
 387     return ret;
 388 }
 389
 390
 391 /***********************************************************************
 392  *           lstrcpyAtoW   (Not a Windows API)
 393  */
 394 LPWSTR WINAPI lstrcpyAtoW( LPWSTR dst, LPCSTR src )
 395 {
 396     register LPWSTR p = dst;
 397
 398     TRACE("%s\n",src);
 399
 400     while ((*p++ = (WCHAR)(unsigned char)*src++));
 401     return dst;
 402 }
 403
 404
 405 /***********************************************************************
 406  *           lstrcpyWtoA   (Not a Windows API)
 407  */
 408 LPSTR WINAPI lstrcpyWtoA( LPSTR dst, LPCWSTR src )
 409 {
 410     register LPSTR p = dst;
 411
 412     TRACE("L%s\n",debugstr_w(src));
 413
 414     while ((*p++ = (CHAR)*src++));
 415     return dst;
 416 }
 417
 418
 419 /***********************************************************************
 420  *           lstrcpynAtoW   (Not a Windows API)
 421  * Note: this function differs from the UNIX strncpy, it _always_ writes
 422  * a terminating \0
 423  */
 424 LPWSTR WINAPI lstrcpynAtoW( LPWSTR dst, LPCSTR src, INT n )
 425 {
 426     LPWSTR p = dst;
 427
 428     TRACE("%s %i\n",src, n);
 429
 430     while ((n-- > 1) && *src) *p++ = (WCHAR)(unsigned char)*src++;
 431     if (n >= 0) *p = 0;
 432     return dst;
 433 }
 434
 435
 436 /***********************************************************************
 437  *           lstrcpynWtoA   (Not a Windows API)
 438  * Note: this function differs from the UNIX strncpy, it _always_ writes
 439  * a terminating \0
 440  */
 441 LPSTR WINAPI lstrcpynWtoA( LPSTR dst, LPCWSTR src, INT n )
 442 {
 443     if (--n >= 0)
 444     {
 445         CRTDLL_wcstombs( dst, src, n );
 446         dst[n] = 0;
 447     }
 448     return dst;
 449 }
 450
 451 /***********************************************************************
 452  *           UnicodeToAnsi   (KERNEL.434)
 453  */
 454 INT16 WINAPI UnicodeToAnsi16( LPCWSTR src, LPSTR dst, INT16 codepage )
 455 {
 456     if ( codepage != -1 )
 457         FIXME("codepage %d not supported\n", codepage );
 458
 459     lstrcpyWtoA( dst, src );
 460
 461     return (INT16)lstrlenA( dst );
 462 }
 463
 464
 465 /***********************************************************************
 466  *           Copy   (GDI.250)
 467  */
 468 void WINAPI Copy16( LPVOID src, LPVOID dst, WORD size )
 469 {
 470     memcpy( dst, src, size );
 471 }
 472
 473
 474 /***********************************************************************
 475  *           RtlFillMemory   (KERNEL32.441)
 476  */
 477 VOID WINAPI RtlFillMemory( LPVOID ptr, UINT len, UINT fill )
 478 {
 479     memset( ptr, fill, len );
 480 }
 481
 482
 483 /***********************************************************************
 484  *           RtlMoveMemory   (KERNEL32.442)
 485  */
 486 VOID WINAPI RtlMoveMemory( LPVOID dst, LPCVOID src, UINT len )
 487 {
 488     memmove( dst, src, len );
 489 }
 490
 491
 492 /***********************************************************************
 493  *           RtlZeroMemory   (KERNEL32.444)
 494  */
 495 VOID WINAPI RtlZeroMemory( LPVOID ptr, UINT len )
 496 {
 497     memset( ptr, 0, len );
 498 }
 499
 500
 501 /***********************************************************************
 502  *           AnsiToOem16   (KEYBOARD.5)
 503  */
 504 INT16 WINAPI AnsiToOem16( LPCSTR s, LPSTR d )
 505 {
 506     CharToOemA( s, d );
 507     return -1;
 508 }
 509
 510
 511 /***********************************************************************
 512  *           OemToAnsi16   (KEYBOARD.6)
 513  */
 514 INT16 WINAPI OemToAnsi16( LPCSTR s, LPSTR d )
 515 {
 516     OemToCharA( s, d );
 517     return -1;
 518 }
 519
 520
 521 /***********************************************************************
 522  *           AnsiToOemBuff16   (KEYBOARD.134)
 523  */
 524 void WINAPI AnsiToOemBuff16( LPCSTR s, LPSTR d, UINT16 len )
 525 {
 526     if (len != 0) CharToOemBuffA( s, d, len );
 527 }
 528
 529
 530 /***********************************************************************
 531  *           OemToAnsiBuff16   (KEYBOARD.135)
 532  */
 533 void WINAPI OemToAnsiBuff16( LPCSTR s, LPSTR d, UINT16 len )
 534 {
 535     if (len != 0) OemToCharBuffA( s, d, len );
 536 }
 537
 538
 539 /***********************************************************************
 540  *           CharToOem32A   (USER32.37)
 541  */
 542 BOOL WINAPI CharToOemA( LPCSTR s, LPSTR d )
 543 {
 544     LPSTR oldd = d;
 545     if (!s || !d) return TRUE;
 546     TRACE("CharToOem %s\n", debugstr_a (s));
 547     while ((*d++ = ANSI_TO_OEM(*s++)));
 548     TRACE("       to %s\n", debugstr_a (oldd));
 549     return TRUE;
 550 }
 551
 552
 553 /***********************************************************************
 554  *           CharToOemBuff32A   (USER32.38)
 555  */
 556 BOOL WINAPI CharToOemBuffA( LPCSTR s, LPSTR d, DWORD len )
 557 {
 558     while (len--) *d++ = ANSI_TO_OEM(*s++);
 559     return TRUE;
 560 }
 561
 562
 563 /***********************************************************************
 564  *           CharToOemBuff32W   (USER32.39)
 565  */
 566 BOOL WINAPI CharToOemBuffW( LPCWSTR s, LPSTR d, DWORD len )
 567 {
 568     while (len--) *d++ = ANSI_TO_OEM(*s++);
 569     return TRUE;
 570 }
 571
 572
 573 /***********************************************************************
 574  *           CharToOem32W   (USER32.40)
 575  */
 576 BOOL WINAPI CharToOemW( LPCWSTR s, LPSTR d )
 577 {
 578     LPSTR oldd = d;
 579     if (!s || !d) return TRUE;
 580     TRACE("CharToOem L%s\n", debugstr_w (s));
 581     while ((*d++ = ANSI_TO_OEM(*s++)));
 582     TRACE("       to %s\n", debugstr_a (oldd));
 583     return TRUE;
 584 }
 585
 586
 587 /***********************************************************************
 588  *           OemToChar32A   (USER32.402)
 589  */
 590 BOOL WINAPI OemToCharA( LPCSTR s, LPSTR d )
 591 {
 592     LPSTR oldd = d;
 593     TRACE("OemToChar %s\n", debugstr_a (s));
 594     while ((*d++ = OEM_TO_ANSI(*s++)));
 595     TRACE("       to %s\n", debugstr_a (oldd));
 596     return TRUE;
 597 }
 598
 599
 600 /***********************************************************************
 601  *           OemToCharBuff32A   (USER32.403)
 602  */
 603 BOOL WINAPI OemToCharBuffA( LPCSTR s, LPSTR d, DWORD len )
 604 {
 605     TRACE("OemToCharBuff %s\n", debugstr_an (s, len));
 606     while (len--) *d++ = OEM_TO_ANSI(*s++);
 607     return TRUE;
 608 }
 609
 610
 611 /***********************************************************************
 612  *           OemToCharBuff32W   (USER32.404)
 613  */
 614 BOOL WINAPI OemToCharBuffW( LPCSTR s, LPWSTR d, DWORD len )
 615 {
 616     TRACE("OemToCharBuff %s\n", debugstr_an (s, len));
 617     while (len--) *d++ = (WCHAR)OEM_TO_ANSI(*s++);
 618     return TRUE;
 619 }
 620
 621
 622 /***********************************************************************
 623  *           OemToChar32W   (USER32.405)
 624  */
 625 BOOL WINAPI OemToCharW( LPCSTR s, LPWSTR d )
 626 {
 627     while ((*d++ = (WCHAR)OEM_TO_ANSI(*s++)));
 628     return TRUE;
 629 }
 630
 631 /***********************************************************************
 632  *  WideCharToLocal (Not a Windows API)
 633  *  similar lstrcpyWtoA, should handle codepages properly
 634  *
 635  *  RETURNS
 636  *    strlen of the destination string
 637  */
 638
 639 INT WINAPI WideCharToLocal(
 640     LPSTR pLocal,
 641                 LPCWSTR pWide,
 642                 INT dwChars)
 643 { *pLocal = 0;
 644   TRACE("(%p, %s, %i)\n",       pLocal, debugstr_w(pWide),dwChars);
 645   WideCharToMultiByte(CP_ACP,0,pWide,-1,pLocal,dwChars,NULL,NULL);
 646   return strlen(pLocal);
 647 }
 648 /***********************************************************************
 649  *  LocalToWideChar (Not a Windows API)
 650  *  similar lstrcpyAtoW, should handle codepages properly
 651  *
 652  *  RETURNS
 653  *    strlen of the destination string
 654  */
 655 INT WINAPI LocalToWideChar(
 656     LPWSTR pWide,
 657                 LPCSTR pLocal,
 658                 INT dwChars)
 659 { *pWide = 0;
 660   TRACE("(%p, %s, %i)\n",pWide, pLocal, dwChars);
 661         MultiByteToWideChar(CP_ACP,0,pLocal,-1,pWide,dwChars);
 662   return lstrlenW(pWide);
 663 }
 664
 665
 666 /***********************************************************************
 667  *           lstrrchr   (Not a Windows API)
 668  *
 669  * This is the implementation meant to be invoked form within
 670  * COMCTL32_StrRChrA and shell32(TODO)...
 671  *
 672  * Return a pointer to the last occurence of wMatch in lpStart
 673  * not looking further than lpEnd...
 674  */
 675 LPSTR WINAPI lstrrchr( LPCSTR lpStart, LPCSTR lpEnd, WORD wMatch )
 676 {
 677   LPCSTR lpGotIt = NULL;
 678
 679   TRACE("(%s, %s)\n", lpStart, lpEnd);
 680
 681   if (!lpEnd) lpEnd = lpStart + strlen(lpStart);
 682
 683   for(; lpStart < lpEnd; lpStart = CharNextA(lpStart))
 684     if (!ChrCmpA( GET_WORD(lpStart), wMatch))
 685       lpGotIt = lpStart;
 686
 687   return ((LPSTR)lpGotIt);
 688 }
 689
 690 /***********************************************************************
 691  *           ChrCmpW
 692  * This fuction returns FALSE if both words match, TRUE otherwise...
 693  */
 694 static BOOL ChrCmpW( WORD word1, WORD word2) {
 695   return (word1 != word2);
 696 }
 697
 698 /***********************************************************************
 699  *           lstrrchrw    (Not a Windows API)
 700  *
 701  * This is the implementation meant to be invoked form within
 702  * COMCTL32_StrRChrW and shell32(TODO)...
 703  *
 704  * Return a pointer to the last occurence of wMatch in lpStart
 705  * not looking further than lpEnd...
 706  */
 707 LPWSTR WINAPI lstrrchrw( LPCWSTR lpStart, LPCWSTR lpEnd, WORD wMatch )
 708 {
 709   LPCWSTR lpGotIt = NULL;
 710
 711   TRACE("(%p, %p, %c)\n", lpStart,      lpEnd, wMatch);
 712   if (!lpEnd) lpEnd = lpStart + lstrlenW(lpStart);
 713
 714   for(; lpStart < lpEnd; lpStart = CharNextW(lpStart))
 715     if (!ChrCmpW( GET_WORD(lpStart), wMatch))
 716       lpGotIt = lpStart;
 717
 718   return (LPWSTR)lpGotIt;
 719 }
 720
 721 /***********************************************************************
 722  *           ChrCmpA
 723  * This fuction returns FALSE if both words match, TRUE otherwise...
 724  */
 725 static BOOL ChrCmpA( WORD word1, WORD word2) {
 726   if (LOBYTE(word1) == LOBYTE(word2)) {
 727     if (IsDBCSLeadByte(LOBYTE(word1))) {
 728       return (word1 != word2);
 729     }
 730     return FALSE;
 731   }
 732   return TRUE;
 733 }