///////    File: strtok.C    ///////
#include        <iostream.h>
#include        <string.h>
typedef char * String;

String strtok(String s, const String del)
{ String token;
  int i = 0;
  static String spt = NULL;     // where to search for next token
      if ( s ) spt = s;         // new string
      if ( !spt || spt[0] == '\0' ) return(NULL);
      while ( spt[i] != '\0' && strchr(del, spt[i]) )
          i++ ;                 // find beginning of token
      token = &spt[i];
      while ( spt[i] != '\0' && !strchr(del, spt[i]) )
          i++ ;                 // find end of token
      spt[i] = '\0';            // terminator in place
      spt = &spt[i+1];          // record position
      return(token);            // token produced
}


const char *white = "\t \n\r";   // TAB SPACE NEWLINE RETURN

int main()
{ char st1[] = "There it is.";
  char st2[] = "\n \t A string\n \r  of 1 or more   \t tokens";
  char* strarr[2] = {st1, st2};
  String tk;
      for ( int i = 0 ; i < 2 ; i++ )    // process both strings
      {   tk = strtok(strarr[i], white);
          do
          {     cout << tk << "\n";
          } while ( (tk = strtok(NULL, white)) );
      }
      return(0);
}