Split a delimited string into a vector of strings and apply a search and replace all on it

splitter.cc

#include <cstdio>
#include <cstdlib>
#include <string>
#include <vector>

using namespace std;

vector<string> splitter(const string &input,char delim=',')
{
    vector<string> retval;
    const size_t I=input.size();
    size_t p,i;
    for(p=0,i=0;i<I;i++) if(input[i]==delim and i+1<I)
    {
        retval.push_back(input.substr(p,i-p));
        p=i+1;
    }
    if(p<i) 
    {
        string last=input.substr(p,i-p);
        if(last.back()==delim)
        {
            last.back()=0;
            retval.push_back(last);
            retval.push_back("");
        }
        else retval.push_back(last);
    }
    return retval;     
}

void replace_all(string &input,const string &search,const string &replace)
{
    for(size_t p=0;(p=input.find(search,p))!=string::npos;p+=replace.size()) input.replace(p,search.size(),replace);
}

int main()
{
    const string all="moo,boo,koo,loo,too";
    string input="doo,all,roo";
    replace_all(input,"all",all);
    vector<string> vec=splitter(input);
    for(string t:vec) printf("%s\n",t.c_str());
}