c程序设计语言_习题1-16_自己编写getline()函数，接收整行字符串，并完整输出

/* This is the first program exercise where the spec isn't entirely
 * clear. The spec says, 'Revise the main routine', but the true
 * length of an input line can only be determined by modifying
 * getline. So that's what we'll do. getline will now return the
 * actual length of the line rather than the number of characters
 * read into the array passed to it.
 */

#include <stdio.h>

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

int getline(char line[], int maxline); //自己编写getline()函数，接收整行字符串
void copy(char to[], char from[]); //和c语言库函数strcpy()实现同样的功能。

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

  max = 0;

  while((len = getline(line, MAXLINE)) > 0)
  {
    printf("%d: %s", len, line);

    if(len > max)
    {
      max = len;
      copy(longest, line);
    }
  }
  if(max > 0)
  {
    printf("Longest is %d characters:
%s", max, longest);
  }
  printf("
");
  return 0;
}

/* getline: read a line into s, return length */
int getline(char s[], int lim)
{
  int c, i, j;

  for(i = 0, j = 0; (c = getchar())!=EOF && c != '
'; ++i)
  {
    if(i < lim - 1)
    {
      s[j++] = c;
    }
  }
  if(c == '
')
  {
    if(i <= lim - 1)
    {
      s[j++] = c;
    }
    ++i;
  }
  s[j] = '