Convert newlines to \n and strip extra trailing whitespace

gistfile1.c

#include <stdio.h>
#include <string.h>

#define MAXLINE 16484

int main(void)
{
  int c;
  size_t len;
  char line[MAXLINE] = { 0 };

  while (NULL != fgets(line, MAXLINE, stdin))
  {
    if ('\0' != line[0])
    {
      len = strlen(line);
      while (len--)
      {
        c = line[len];
        if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
          line[len] = '\0';
        else
          break;
      }
    }
    fputs(line, stdout);
    fputc('\n', stdout);
  }
  
  return 0;
}