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/* Implementation of the GETLOG g77 intrinsic.
Copyright (C) 2005-2022 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 <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)
{
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 = xmalloc (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;
gfc_charlen_type 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
}
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