====== StrSubstr ======

<code cpp>
/* 
 * 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);
}


</code>