Ругается компилятор на Ubuntu - C (СИ)

#include "stdio.h"
#define MAXLINE 1000 
 
int getline(char line[], int maxline);
 
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;
}
 
void copy(char to[], char from[]);
 
void copy(char to[], char from[])
{
    int i;
 
    i = 0;
    while ((to[i] = from[i]) != '\0')
        ++i;
}
int main()
{
    int len; 
    int max; 
    char line[MAXLINE]; 
    char longest[MAXLINE]; 
    int c;
    max = 0;
    while ((len = getline(line, MAXLINE)) > 0) {
        if (line[len - 1] != '\n')
            while ((c = getchar()) != EOF && c != '\n')
                ++len;
        if (len > max) {
            max = len;
            copy(longest, line);
        }
    }
    
    if (max < MAXLINE)
        --max;
    if (max > 0) { 
        if (max > len)
            printf("The longest line is:%s ...\n", longest);
        else printf("The longest line is: %s\n", longest);
        printf("This line consists of %d characters\n", max);
    }
 
    return 0;
}