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69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/*
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* Notepad (search.c)
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* Copyright (C) 1999 by Marcel Baur
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This file features Heuristic Boyer-Moore Text Search
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*
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* Always: - Buf is the Buffer containing the whole text
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* ======= - SP is the Search Pattern, which has to be found in Buf.
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*
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*/
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#include <windows.h>
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#define CHARSETSIZE 255
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int delta[CHARSETSIZE];
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/* rightmostpos: return rightmost position of ch in szSP (or -1) */
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int rightmostpos(char ch, LPSTR szSP, int nSPLen) {
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int i = nSPLen;
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while ((i>0) & (szSP[i]!=ch)) i--;
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return(i);
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}
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/* setup_delta: setup delta1 cache */
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void setup_delta(LPSTR szSP, int nSPLen) {
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int i;
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for (i=0; i<CHARSETSIZE; i++) {
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delta[i] = nSPLen;
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}
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for (i=0; i<nSPLen; i++) {
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delta[(int)szSP[i]] = (nSPLen - rightmostpos(szSP[i], szSP, nSPLen));
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}
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}
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int bm_search(LPSTR szBuf, int nBufLen, LPSTR szSP, int nSPLen) {
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int i = nSPLen;
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int j = nSPLen;
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do {
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if ((szBuf[i] = szSP[j])) {
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i--; j--;
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} else {
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if ((nSPLen-j+1) > delta[(int)szBuf[i]]) {
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i+= (nSPLen-j+1);
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} else {
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i+= delta[(int)szBuf[i]];
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}
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}
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} while (j>0 && i<=nBufLen);
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return(i+1);
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}
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