| /* Implementation of the HOSTNM intrinsic. |
| Copyright (C) 2005-2021 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 <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 |