k&r(7.7): Line Input and Output

/* k&r(7.7): Line Input and Output
   created on Mar 27, 2011
   */
#include    "stdio.h"


#define MAXLINE 1000    /* maximum input line length */

    int max;    /* maximum length seen so far */
    char line[MAXLINE]; /* current input line */
    char longest[MAXLINE]; /* longest line saved here */
    int getline1(char *, int);
    void copy(void);

/* print the longest input line; stdardard library version */
main()
{
    int len;
    //extern int max;
    int max;
    extern char longest[];
    extern char line[];
    max = 0;
    while ((len = getline1(line, MAXLINE)) > 0)
      if (len > max) {
          max = len;
          copy();
      }
    if (max > 0) /* there was a line */
      printf("%s", longest);
    return 0;
}

/* getline: read a line into s, return length; implement from std fgets() */
int getline1(char *line, int max)
{
    if(fgets(line, max, stdin) == NULL)
      return 0;
    else
      return strlen(line);
}

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