1.17.c

#include <stdio.h>

#define MAXLINE 1000

int getline(char s[], int lim)
{
	int c, i;

	for (i = 0; i < lim - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
		s[i] = c;
	if (c == '\n') {
		s[i] = c;
		++i;
	}
	s[i] = '\0';
	return i;
}

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

	while ((len = getline(line, MAXLINE)) > 0) {
		if (len >= 80) {
			if (line[len - 1] == 10) {
				fputs(line, stdout);
			} else {
				puts(line);
			}
		}
	}
	return 0;
}