StrSubstr

/* 
 * File:   strSubst.cpp
 * Author: borovec
 *
 * Created on 18. listopad 2008, 17:49
 */
 
#include <iostream>
 
using namespace std;
 
bool isSearchStr(const char * Where, const char * Search){
 
    if(strlen(Search)==0) return (false);
 
    while(*Search!='\0'){
 
        if(*Search!=*Where) return (false);
 
        Where++;
        Search++;
    }
 
    return (true);
}
 
char * reallocArray(char * array, int &len, int newlen){
 
    char * newArray = new char[newlen];
 
    if(len<newlen) len = newlen;
 
    for (int i = 0; i < len; i++) {
        newArray[i] = array[i];
    }
 
    delete [] array;
 
    return newArray;
 
 
}
 
char * strSubst ( const char * Where, const char * Search, const char * Replace )
{
 
    const int lenWhere = strlen(Where);
    const int lenSearch = strlen(Search);
    const int lenReplace = strlen(Replace);
    int lenNewString = lenWhere;
 
    char *newString = new char [lenWhere];
 
    int pos = 0;
 
 
    while(*Where!='\0'){
 
        if(isSearchStr(Where,Search)){
 
           newString = reallocArray(newString, lenNewString, (lenNewString)+(lenReplace-lenSearch));
 
            const char * Rep_bak = Replace;
            while(*Rep_bak!='\0'){
                newString[pos] = *Rep_bak;
                Rep_bak++;
                pos++;
            }
            Where += lenSearch;
            continue;
        }
 
        newString[pos] = *Where;
 
        pos++;
        Where++;
    }
 
    newString[pos] = '\0';
 
    return newString;
 
}
 
/*
 * 
 */
int main(int argc, char** argv) {
 
cout << strSubst ( "Kozino, Kozino, do roka a do dne ...", "Kozino", "Lomikare" ) << endl;
 
cout << strSubst ( "ahojahoj", "ahoj", "ahojahoj" ) << endl;
        // ret -> "ahojahojahojahoj"
 
 cout << strSubst ( "+*[]*++*[]*+test+*[]*++*[]*+", "+*[]*+", "" ) << endl;
        // ret -> "test"
 
 cout << strSubst ( "aaa", "aa", "b" ) << endl;
        // ret -> "ba"
 
 cout << strSubst ( "aaa", "", "b" ) << endl;
        // ret -> "aaa"
 
cout << strSubst ( "Kozino, Kozino, do roka a do dne ...", "", "" ) << endl;
        // ret -> "test"
 
 
    return (EXIT_SUCCESS);
}