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#include <stdlib.h>

#include <string.h>

#include <fcntl.h>

#include <unistd.h>

#include <utmp.h>

#include <_syslist.h>

#include <_ansi.h>

static int utmp_fd = -2;

static char *utmp_file = UTMP_FILE;

static struct utmp utmp_data;

void

setutent ()

{

  if (utmp_fd == -2)

    {

      utmp_fd = _open (utmp_file, O_RDONLY);

    }

  _lseek (utmp_fd, 0, SEEK_SET);

}

void

endutent ()

{

  _close (utmp_fd);

  utmp_fd = -2;

}

void

utmpname (_CONST char *file)

{

  utmp_file = strdup (file);

}

struct utmp *

getutent ()

{

  if (utmp_fd == -2)

    setutent ();

  if (_read (utmp_fd, &utmp_data, sizeof (utmp_data)) < sizeof (utmp_data))

    return 0;

  return &utmp_data;

}

struct utmp *

getutid (struct utmp *id)

{

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

    {

      switch (id->ut_type)

        {

        case RUN_LVL:

        case BOOT_TIME:

        case OLD_TIME:

        case NEW_TIME:

          if (id->ut_type == utmp_data.ut_type)

            return &utmp_data;

        case INIT_PROCESS:

        case LOGIN_PROCESS:

        case USER_PROCESS:

        case DEAD_PROCESS:

          if (id->ut_id == utmp_data.ut_id)

            return &utmp_data;

        default:

          abort ();

        }

    }

  return 0;

}

struct utmp *

getutline (struct utmp *line)

{

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

    {

      if ((utmp_data.ut_type == LOGIN_PROCESS ||

           utmp_data.ut_type == USER_PROCESS) &&

          !strncmp (utmp_data.ut_line, line->ut_line,

                    sizeof (utmp_data.ut_line)))

        return &utmp_data;

    }

  return 0;

}