// COM 1100, Fall 2000, Prof. Futrelle
// Find the string between two delimiters
// Similar to the Lab 7 tasks.
// No tests for find failure done, to keep the code short.
// No real program should omit the tests.
// File ffind.cpp, 20 Nov 2000.

#include <fstream>
#include <string>

using namespace std;

istream & getline( istream & in, string & str, char delim )
{
  char ch;
  str = "";     // empty string, will build one char at-a-time

  while( in.get( ch ) && ch != delim )
    str += ch;

  return in;
}

istream & getline( istream & in, string & str )
{
  return getline( in, str, '\n' );
}


void main()
{
  string inString, subString;
  ifstream in;
  int sStart, sFinish;

  in.open("f1.txt");

  while(getline(in,inString)) {
    sStart = inString.find("#S");
    sFinish = inString.find("#F");
    // now the messy line, to pluck out only what's wanted:
    subString.assign( inString, sStart + 2, sFinish - sStart - 2 );
    // vertical bars precisely show limits of string found
    cout << "Substring found is: |" << subString << '|' << endl;
  }

  in.close();
}

/* Here's the file f1.txt with Start and Finish tags:
the #Sfirst line of#F the file
and #Sthe second#F
#Sand there's more #Fafter that
the #Send#F.
*/

/* Here's the output of the program above:
Substring found is: |first line of|
Substring found is: |the second|
Substring found is: |and there's more |
Substring found is: |end|
*/