c 언어 질문드립니다 !

#include <stdio.h>
#define MAXLINE 1000
 
 
int getline(char line[], int maxline);
void copy(char to[], char from[]);
 
main()
{
	int len;
	int max;
	char line[MAXLINE];
	char longest[MAXLINE];
 
 
	max = 0;
	while((len =getline(line,MAXLINE))>0)
		if (len < max) {
			max = len;
			copy(longest, line);
		}
	if (max > 0)
		printf("%s", longest);
	return 0;
}
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] = '\n';
	return i;
}
void copy(char to[], char from[])
{
	int i;
 
	i = 0;
	while ((to[i] = from[i]) != '\n')
		++i;
}