57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/*
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* Notepad (search.c)
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* Copyright (C) 1999 by Marcel Baur
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* To be distributed under the Wine license
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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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