blob: 1303c9c57a7a112dcc68b63fd457b0bd54e68ab6 [file] [log] [blame]
/* Implementation of the HOSTNM intrinsic.
Copyright (C) 2005-2021 Free Software Foundation, Inc.
Contributed by Fran├žois-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 <errno.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <limits.h>
#ifndef HOST_NAME_MAX
#define HOST_NAME_MAX 255
#endif
/* Windows32 version */
#if defined __MINGW32__ && !defined HAVE_GETHOSTNAME
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <errno.h>
static int
w32_gethostname (char *name, size_t len)
{
/* We could try the WinSock API gethostname, but that will
fail if WSAStartup function has has not been called. We don't
really need a name that will be understood by socket API, so avoid
unnecessary dependence on WinSock libraries by using
GetComputerName instead. */
/* On Win9x GetComputerName fails if the input size is less
than MAX_COMPUTERNAME_LENGTH + 1. */
char buffer[MAX_COMPUTERNAME_LENGTH + 1];
DWORD size = sizeof (buffer);
if (!GetComputerName (buffer, &size))
return -1;
if ((size = strlen (buffer) + 1) > len)
{
errno = EINVAL;
/* Truncate as per POSIX spec. We do not NUL-terminate. */
size = len;
}
memcpy (name, buffer, (size_t) size);
return 0;
}
#undef gethostname
#define gethostname w32_gethostname
#define HAVE_GETHOSTNAME 1
#endif
/* SUBROUTINE HOSTNM(NAME, STATUS)
CHARACTER(len=*), INTENT(OUT) :: NAME
INTEGER, INTENT(OUT), OPTIONAL :: STATUS */
#ifdef HAVE_GETHOSTNAME
static int
hostnm_0 (char *name, gfc_charlen_type name_len)
{
char p[HOST_NAME_MAX + 1];
int val;
memset (name, ' ', name_len);
size_t reqlen = sizeof (p) > (size_t) name_len + 1
? (size_t) name_len + 1: sizeof (p);
val = gethostname (p, reqlen);
if (val == 0)
{
for (gfc_charlen_type i = 0; i < name_len && p[i] != '\0'; i++)
name[i] = p[i];
}
return ((val == 0) ? 0 : errno);
}
extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
iexport_proto(hostnm_i4_sub);
void
hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len)
{
int val = hostnm_0 (name, name_len);
if (status != NULL)
*status = val;
}
iexport(hostnm_i4_sub);
extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
iexport_proto(hostnm_i8_sub);
void
hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len)
{
int val = hostnm_0 (name, name_len);
if (status != NULL)
*status = val;
}
iexport(hostnm_i8_sub);
extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type);
export_proto(hostnm);
GFC_INTEGER_4
hostnm (char *name, gfc_charlen_type name_len)
{
return hostnm_0 (name, name_len);
}
#endif