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#include <string.h>

#include <unistd.h>

#include <sys/types.h>

#include <utmp.h>

#include <fcntl.h>

#include <_syslist.h>

char *

getlogin ()

{

  int utmp_fd;

  struct utmp utmp_buf;

  static char buf[10];

  extern char *ttyname ();

  char *tty;

  if (((tty = ttyname (0)) == 0)

      || ((tty = ttyname (1)) == 0)

      || ((tty = ttyname (2)) == 0))

    return 0;

  if ((utmp_fd = _open (UTMP_FILE, O_RDONLY)) == -1)

    return 0;

  if (!strncmp (tty, "/dev/", 5))

    tty += 5;

  while (_read (utmp_fd, &utmp_buf, sizeof (utmp_buf)) == sizeof (utmp_buf))

    {

      if (!strncmp (tty, utmp_buf.ut_line, sizeof (utmp_buf.ut_line))

          && utmp_buf.ut_type == USER_PROCESS)

        {

          _close (utmp_fd);

          memset (buf, 0, sizeof (buf));

          strncpy (buf, utmp_buf.ut_user, sizeof (utmp_buf.ut_user));

          return buf;

        }

    }

  _close (utmp_fd);

  return 0;

}