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      1 /* Implementation of the HOSTNM intrinsic.
      2    Copyright (C) 2005-2022 Free Software Foundation, Inc.
      3    Contributed by Franois-Xavier Coudert <coudert (at) clipper.ens.fr>
      4 
      5 This file is part of the GNU Fortran runtime library (libgfortran).
      6 
      7 Libgfortran is free software; you can redistribute it and/or
      8 modify it under the terms of the GNU General Public
      9 License as published by the Free Software Foundation; either
     10 version 3 of the License, or (at your option) any later version.
     11 
     12 Libgfortran is distributed in the hope that it will be useful,
     13 but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 GNU General Public License for more details.
     16 
     17 Under Section 7 of GPL version 3, you are granted additional
     18 permissions described in the GCC Runtime Library Exception, version
     19 3.1, as published by the Free Software Foundation.
     20 
     21 You should have received a copy of the GNU General Public License and
     22 a copy of the GCC Runtime Library Exception along with this program;
     23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     24 <http://www.gnu.org/licenses/>.  */
     25 
     26 #include "libgfortran.h"
     27 
     28 #include <errno.h>
     29 #include <string.h>
     30 
     31 #ifdef HAVE_UNISTD_H
     32 #include <unistd.h>
     33 #endif
     34 
     35 #include <limits.h>
     36 
     37 #ifndef HOST_NAME_MAX
     38 #define HOST_NAME_MAX 255
     39 #endif
     40 
     41 
     42 /* Windows32 version */
     43 #if defined __MINGW32__ && !defined  HAVE_GETHOSTNAME
     44 #define WIN32_LEAN_AND_MEAN
     45 #include <windows.h>
     46 #include <errno.h>
     47 
     48 static int
     49 w32_gethostname (char *name, size_t len)
     50 {
     51   /* We could try the WinSock API gethostname, but that will
     52      fail if WSAStartup function has has not been called.  We don't
     53     really need a name that will be understood by socket API, so avoid
     54     unnecessary dependence on WinSock libraries by using
     55     GetComputerName instead.  */
     56 
     57   /* On Win9x GetComputerName fails if the input size is less
     58      than MAX_COMPUTERNAME_LENGTH + 1.  */
     59   char buffer[MAX_COMPUTERNAME_LENGTH + 1];
     60   DWORD size =  sizeof (buffer);
     61 
     62   if (!GetComputerName (buffer, &size))
     63     return -1;
     64 
     65   if ((size = strlen (buffer) + 1)  > len)
     66     {
     67       errno = EINVAL;
     68       /* Truncate as per POSIX spec.  We do not NUL-terminate. */
     69       size = len;
     70     }
     71   memcpy (name, buffer, (size_t) size);
     72 
     73   return 0;
     74 }
     75 
     76 #undef gethostname
     77 #define gethostname w32_gethostname
     78 #define  HAVE_GETHOSTNAME 1
     79 
     80 #endif
     81 
     82 
     83 /* SUBROUTINE HOSTNM(NAME, STATUS)
     84    CHARACTER(len=*), INTENT(OUT) :: NAME
     85    INTEGER, INTENT(OUT), OPTIONAL :: STATUS  */
     86 
     87 #ifdef HAVE_GETHOSTNAME
     88 static int
     89 hostnm_0 (char *name, gfc_charlen_type name_len)
     90 {
     91   char p[HOST_NAME_MAX + 1];
     92   int val;
     93 
     94   memset (name, ' ', name_len);
     95 
     96   size_t reqlen = sizeof (p) > (size_t) name_len + 1
     97     ? (size_t) name_len + 1: sizeof (p);
     98   val = gethostname (p, reqlen);
     99 
    100   if (val == 0)
    101   {
    102     for (gfc_charlen_type i = 0; i < name_len && p[i] != '\0'; i++)
    103       name[i] = p[i];
    104   }
    105 
    106   return ((val == 0) ? 0 : errno);
    107 }
    108 
    109 extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
    110 iexport_proto(hostnm_i4_sub);
    111 
    112 void
    113 hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len)
    114 {
    115   int val = hostnm_0 (name, name_len);
    116   if (status != NULL)
    117     *status = val;
    118 }
    119 iexport(hostnm_i4_sub);
    120 
    121 extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
    122 iexport_proto(hostnm_i8_sub);
    123 
    124 void
    125 hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len)
    126 {
    127   int val = hostnm_0 (name, name_len);
    128   if (status != NULL)
    129     *status = val;
    130 }
    131 iexport(hostnm_i8_sub);
    132 
    133 extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type);
    134 export_proto(hostnm);
    135 
    136 GFC_INTEGER_4
    137 hostnm (char *name, gfc_charlen_type name_len)
    138 {
    139   return hostnm_0 (name, name_len);
    140 }
    141 #endif
    142