Exercise 1.16

Page 30

Revise the main routine of the longest-line program so it will correctly print the length of arbitrarily long input lines, and as much as possible of the text.

#include <stdio.h>
#define MAXLINE 1000

int get_line(char line[], int maxline);
void copy(char to[], char from[]);

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

	max = 0;
	while ((len = get_line(line, MAXLINE)) > 0) {
		if (len > max) {
			max = len;
			copy(longest, line);
		}
	}
	if (max > 0) {
		printf("%d %s", max, longest);
	}
	return 0;
}

int get_line(char s[], int lim)
{
	int c, i = 0;

	while ((c = getchar()) != EOF) {
		if (c == '\n') {
			if (i < lim - 1) {
				s[i] = c;
			}
			break;
		} else if (i < lim - 1) {
			s[i] = c;
		}
		i++;
	}

	if (i < lim) {
		s[i] = '\0';
	} else {
		s[lim - 1] = '\0';
	}

	printf("%s\n", s);

	return i;
}

void copy(char to[], char from[])
{
	int i;

	i = 0;
	while ((to[i] = from[i]) != '\0') {
		++i;
	}
}