/* File: count_blue1.c

   Count the number of times that the word
   "blue" appears in an input string.
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <readline/readline.h>

int count_blue (char * str) ;


int main() {

   char *str ;
   int n ;

   str = readline("Enter a string: ") ;

   n = count_blue(str) ;
   printf("The world \"blue\" appeard in \"%s\" %d times\n", 
      str, n) ;

   // deallocate memory
   free(str) ;
    
   return 0 ;
}


// Count # of times the substring "blue" appears
// in the string str.

int count_blue(char *str) {
   int count = 0, i = 0 ;

   while (1) {

      // skip over chars until 'b' found
      while(str[i] != '\0' && str[i] != 'b') {
         i = i + 1 ;
      }

      // if end of string reached
      if (str[i] == '\0') return count ;

      // Otherwise found 'b'
      i++ ;
      if (str[i] != 'l' ) continue ;

      // Otherwise found "bl"
      i++ ;
      if (str[i] != 'u') continue ;

      //Otherwise found "blu"
      i++ ;
      if (str[i] != 'e') continue ;

      count++ ;
   }

}