Reconstructing /etc/passwd based on API, in case of NIS or LDAP, the results will correctly differ

reconstruct_etc_passwd.c

#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>
#include <string.h>
#include <unistd.h>

int
main (int argc, char *argv[])
{ 
  const int s = 4096;

  char newpasswd[] = "/tmp/passwd.XXXXXX";
  char line[s];

  int fd;

  struct passwd *ptr;

  if ((fd = mkstemp (newpasswd)) < 0)
    { 
      perror ("mkstemp");
      return 1;
    }

  setpwent ();
  while ((ptr = getpwent ()) != NULL)
    { 
      snprintf (line, s, "%s:%s:%ld:%ld:%s:%s:%s\n",
                ptr->pw_name, ptr->pw_passwd,
                (long) ptr->pw_uid, (long) ptr->pw_gid,
                ptr->pw_gecos, ptr->pw_dir, ptr->pw_shell);
      write (fd, line, strlen (line));
    }

  endpwent ();
  
  if (close (fd) < 0)
    perror ("close");

  puts (newpasswd);

  return 0;
}