/*
 * DOS Pig Latin Filter
 * Refer to Lesson 12-5 for more information on
 * filters. This program uses the standard type
 * of filter as introduced for the ROT13.C
 * program
 */

#include <stdio.h>
#include <ctype.h>

void iglatinpay(char *english);

void main()
{
    char word[32];      //input storage
    char *w;            //pointer to the word buffer
    char ch;
    int count;

/*
 * This is a standard construction for filters:
 * fgetchar reads STDIN and fputchar writes STDOUT
 *
 * Along the way, the isalpha() function is used to
 * find the start of a word. If so, a while loop
 * is set up to read that word and store it into
 * the word[] buffer. The word is only read at this
 * point, not displayed.
 *
 * When the end of the word is found, it is capped
 * with a NULL byte and sent to the iglatinpay()
 * function to be turned into Pig Latin. It's that
 * word that is then send to STDOUT
 */

    do
    {
        ch = fgetchar();
        if(isalpha(ch))             //a word starts
        {
            count=0;
            while(isalpha(ch))      //read the word
            {
                word[count] = ch;   //store it
                count++;
                ch = fgetchar();    //keep reading
            }
            word[count] = '\0';     //cap with a NULL
            iglatinpay(word);       //process the word

/* This routine displays the word stored in word[] */

            w = word;
            while(*w)
            {
                fputchar(*w);       //use STDOUT
                w++;
            }

/* Finally, he original non-alpha character is displayed */

            fputchar(ch);
        }
        else                        //the else part
        {                           // handles non-alpha
            fputchar(ch);           // I/O
        }
    }
    while(ch!=EOF);
}