143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* Implementation of the HOSTNM intrinsic.
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Copyright (C) 2005-2017 Free Software Foundation, Inc.
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Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <errno.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <limits.h>
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#ifndef HOST_NAME_MAX
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#define HOST_NAME_MAX 255
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#endif
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/* Windows32 version */
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#if defined __MINGW32__ && !defined HAVE_GETHOSTNAME
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <errno.h>
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static int
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w32_gethostname (char *name, size_t len)
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{
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/* We could try the WinSock API gethostname, but that will
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fail if WSAStartup function has has not been called. We don't
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really need a name that will be understood by socket API, so avoid
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unnecessary dependence on WinSock libraries by using
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GetComputerName instead. */
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/* On Win9x GetComputerName fails if the input size is less
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than MAX_COMPUTERNAME_LENGTH + 1. */
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char buffer[MAX_COMPUTERNAME_LENGTH + 1];
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DWORD size = sizeof (buffer);
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if (!GetComputerName (buffer, &size))
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return -1;
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if ((size = strlen (buffer) + 1) > len)
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{
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errno = EINVAL;
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/* Truncate as per POSIX spec. We do not NUL-terminate. */
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size = len;
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}
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memcpy (name, buffer, (size_t) size);
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return 0;
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}
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#undef gethostname
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#define gethostname w32_gethostname
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#define HAVE_GETHOSTNAME 1
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#endif
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/* SUBROUTINE HOSTNM(NAME, STATUS)
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CHARACTER(len=*), INTENT(OUT) :: NAME
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INTEGER, INTENT(OUT), OPTIONAL :: STATUS */
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#ifdef HAVE_GETHOSTNAME
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static int
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hostnm_0 (char *name, gfc_charlen_type name_len)
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{
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int val, i;
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char p[HOST_NAME_MAX + 1];
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memset (name, ' ', name_len);
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size_t reqlen = sizeof (p) > (size_t) name_len + 1
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? (size_t) name_len + 1: sizeof (p);
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val = gethostname (p, reqlen);
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if (val == 0)
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{
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i = -1;
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while (i < name_len && p[++i] != '\0')
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name[i] = p[i];
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}
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return ((val == 0) ? 0 : errno);
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}
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extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
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iexport_proto(hostnm_i4_sub);
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void
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hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len)
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{
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int val = hostnm_0 (name, name_len);
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if (status != NULL)
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*status = val;
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}
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iexport(hostnm_i4_sub);
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extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
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iexport_proto(hostnm_i8_sub);
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void
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hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len)
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{
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int val = hostnm_0 (name, name_len);
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if (status != NULL)
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*status = val;
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}
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iexport(hostnm_i8_sub);
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extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type);
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export_proto(hostnm);
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GFC_INTEGER_4
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hostnm (char *name, gfc_charlen_type name_len)
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{
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return hostnm_0 (name, name_len);
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}
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#endif
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