/*
 * trim_strings.c
 *
 *  Remove trailing blanks and tabs from each line of input, and
 *  delete entirely blank lines.
 *  K&R Exercise 1.18
 */


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


// Maximum input line size
#define MAXLINE 256


// Function that trims the whitespace at the end of string s
// and returns the length of the new string.
int trim_string (char s[]);


int
main()
{
    char line[MAXLINE];
    int line_length;

    // Read input line-by-line
    while (fgets(line, MAXLINE, stdin) != NULL) {
        // Trim whitespace and print line if any characters left
        line_length = trim_string(line);
        if (line_length > 0)
            printf("|%s|\n", line);
    }

    return 0;
}


int
trim_string (char s[])
{
    // Implementation of the trim_string function
    int i = strlen(s);

    while(i > 0 && isspace(s[i-1])) {
        s[i-1] = '\0';
        i--;
    }

    return i;
}