Thread: getline and copy funcitons

Can someone explain me getline() and copy() ? I've tried to read and read it again but I can't understand it.

This is a code from "The C Programming Language, Kernighan and Ritchie"

Code:

#include <stdio.h>
#define MAXLINE 1000 /* maximum input line lenght */


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

/* print the longest input line */
main()
{
	int len;		/* current line lenght */
	int max;		/* maximum lenght seen so far */
	char line[MAXLINE];	/* current input line */
	char longest[MAXLINE]; 	/* longest line saved here */

	max = 0;
	while ((len = getline(line, MAXLINE)) > 0)
		if (len > max) {
		max = len;
	copy(longest, line);
}
	if (max > 0) /* there was a line */
	printf("%s", longest);
	return 0;
}

/* getline: read a line into s, return lenght */
	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;
}

/* copy: copy 'from' into 'to'; assume to is big enough */
	void copy(char to[], char from[])
{
	int i;
	i = 0;
	while ((to[i] = from[i]) != '\0')
	++i;
}