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/* Implementation of the GETLOG g77 intrinsic.

   Copyright (C) 2005, 2007, 2009, 2011 Free Software Foundation, Inc.

   Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>

This file is part of the GNU Fortran runtime library (libgfortran).

Libgfortran is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public

License as published by the Free Software Foundation; either

version 3 of the License, or (at your option) any later version.

Libgfortran is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"

#include <stdlib.h>

#include <string.h>

#ifdef HAVE_UNISTD_H

#  if defined __MINGW32__ && defined  HAVE_GETLOGIN

#    define _POSIX 1

#  endif

#include <unistd.h>

#endif

#ifdef HAVE_PWD_H

#include <pwd.h>

#endif

/* Windows32 version */

#if defined __MINGW32__ && !defined  HAVE_GETLOGIN

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include <lmcons.h>  /* for UNLEN */ 

static char *

w32_getlogin (void)

{

  static char name [UNLEN + 1];

  DWORD namelen = sizeof (name);

  GetUserName (name, &namelen);

  return (name[0] == 0 ?  NULL : name);

}

#undef getlogin

#define getlogin w32_getlogin

#define HAVE_GETLOGIN 1

#endif

/* GETLOG (LOGIN), g77 intrinsic for retrieving the login name for the

   process.

   CHARACTER(len=*), INTENT(OUT) :: LOGIN  */

void PREFIX(getlog) (char *, gfc_charlen_type);

export_proto_np(PREFIX(getlog));

void

PREFIX(getlog) (char * login, gfc_charlen_type login_len)

{

  int p_len;

  char *p;

  memset (login, ' ', login_len); /* Blank the string.  */

#if defined(HAVE_POSIX_GETPWUID_R) && defined(HAVE_GETEUID)

  struct passwd pwd;

  struct passwd *result;

  char *buf;

  int err;

  /* To be pedantic, buflen should be determined by

     sysconf(_SC_GETPW_R_SIZE_MAX), which is 1024 on some tested

     targets; we do something simple in case the target doesn't

     support sysconf.  */

  static const size_t buflen = 1024;

  buf = get_mem (buflen);

  err = getpwuid_r (geteuid (), &pwd, buf, buflen, &result);

  if (err != 0 || result == NULL)

    goto cleanup;

  p = pwd.pw_name;

#elif defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)

  {

    struct passwd *pw = getpwuid (geteuid ());

    if (pw)

      p = pw->pw_name;

    else

      return;

  }

#elif HAVE_GETLOGIN

  p = getlogin();

# else

  return;

#endif

  if (p == NULL)

    goto cleanup;

  p_len = strlen (p);

  if (login_len < p_len)

    p_len = login_len;

  memcpy (login, p, p_len);

 cleanup:

#if defined (HAVE_POSIX_GETPWUID_R) && defined(HAVE_GETEUID)

  free (buf);

#else

  ;

#endif

}