main.c

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "mystring.h"

int fTerminate(char ch, int * pbDiscardChar);

int main(int argc, char ** argv) {
    MYSTRING str;
    FILE * in;

    if((str = mystring_init_default()) == MYSTRING_STATUS_ERROR) {
        printf("Error initializing MYSTRING object.\n");
        return -1;
    }

    if((in = fopen("book.txt", "r")) == NULL) {
        printf("Error opening file \"book.txt\". Does the file exist?\n");
        return -1;
    }

    while(mystring_input(str, in, 1, fTerminate) != MYSTRING_STATUS_ERROR) {
        if(mystring_size(str) == 4) {
            mystring_output(str, stdout);
            printf("\n");
        }
    }

    mystring_destroy(&str);

    return 0;
}

int fTerminate(char ch, int * pbDiscardChar) {
    // Terminate on whitespace characters or non-alpha characters.
    return (*pbDiscardChar = ((isspace(ch) || (isalpha(ch) == 0))?1:0));
}