K&R C Exercise 1-16 Solution

/*
 * Exercise 1-16 Revise the main routine of the longest line 
 * program so it will correctly print the length of arbitrarily 
 * long inputl lines, and as much as possible of the text.
 *
 * fduan, Dec. 10, 2011 
 */
#include <stdio.h>

#define MAX_LEN 1000 /* maximum input line size */

int getline( char line[], int max_len );
void copy_line( char to[], char from[] );

int main()
{
	int len, max_len;
	char line[MAX_LEN], longest[MAX_LEN];

	max_len = 0;
	line[0] = longest[0] = '\0';
	while( ( len = getline( line, MAX_LEN ) ) > 0 )
	{
		printf( "%d, %s", len, line );
		if( len > max_len )
		{
			max_len = len;
			copy_line( longest, line );
		}
	}
	
	if( max_len > 0 )
	{
		printf( "%d, %s", max_len, longest );
	}

	return 0;
}

int getline( char line[], int max_len )
{
	int c, len, i;
	len = i = 0;

	while( ( c = getchar() ) != EOF && c != '\n' )
	{
		if( len < max_len - 2 )
			line[i++] = c;
		++len;
	}

	if( c == '\n' ) 
	{
		line[i++] = c;
		++len;
	}

	line[i] = '\0';

	return len;
}

void copy_line( char to[], char from[] )
{
	int i = 0;
	while( ( to[i] = from[i] ) != '\0' )
		++i;
}