libgfortran/intrinsics/hostnm.c

   1 /* Implementation of the HOSTNM intrinsic.
   2    Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
   3    Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
   4
   5 This file is part of the GNU Fortran 95 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
  36 /* Windows32 version */
  37 #if defined __MINGW32__ && !defined  HAVE_GETHOSTNAME
  38 #define WIN32_LEAN_AND_MEAN
  39 #include <windows.h>
  40 #include <errno.h>
  41
  42 static int
  43 w32_gethostname (char *name, size_t len)
  44 {
  45   /* We could try the WinSock API gethostname, but that will
  46      fail if WSAStartup function has has not been called.  We don't
  47     really need a name that will be understood by socket API, so avoid
  48     unnecessary dependence on WinSock libraries by using
  49     GetComputerName instead.  */
  50
  51   /* On Win9x GetComputerName fails if the input size is less
  52      than MAX_COMPUTERNAME_LENGTH + 1.  */
  53   char buffer[MAX_COMPUTERNAME_LENGTH + 1];
  54   DWORD size =  sizeof (buffer);
  55
  56   if (!GetComputerName (buffer, &size))
  57     return -1;
  58
  59   if ((size = strlen (buffer) + 1)  > len)
  60     {
  61       errno = EINVAL;
  62       /* Truncate as per POSIX spec.  We do not NUL-terminate. */
  63       size = len;
  64     }
  65   memcpy (name, buffer, (size_t) size);
  66
  67   return 0;
  68 }
  69
  70 #undef gethostname
  71 #define gethostname w32_gethostname
  72 #define  HAVE_GETHOSTNAME 1
  73
  74 #endif
  75
  76
  77 /* SUBROUTINE HOSTNM(NAME, STATUS)
  78    CHARACTER(len=*), INTENT(OUT) :: NAME
  79    INTEGER, INTENT(OUT), OPTIONAL :: STATUS  */
  80
  81 #ifdef HAVE_GETHOSTNAME
  82 extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
  83 iexport_proto(hostnm_i4_sub);
  84
  85 void
  86 hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len)
  87 {
  88   int val, i;
  89   char *p;
  90
  91   memset (name, ' ', name_len);
  92   p = gfc_alloca (name_len + 1);
  93
  94   val = gethostname (p, name_len);
  95
  96   if (val == 0)
  97   {
  98     i = -1;
  99     while (i < name_len && p[++i] != '\0')
 100       name[i] = p[i];
 101   }
 102
 103   if (status != NULL)
 104     *status = (val == 0) ? 0 : errno;
 105 }
 106 iexport(hostnm_i4_sub);
 107
 108 extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
 109 iexport_proto(hostnm_i8_sub);
 110
 111 void
 112 hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len)
 113 {
 114   int val, i;
 115   char *p;
 116
 117   memset (name, ' ', name_len);
 118   p = gfc_alloca (name_len + 1);
 119
 120   val = gethostname (p, name_len);
 121
 122   if (val == 0)
 123   {
 124     i = -1;
 125     while (i < name_len && p[++i] != '\0')
 126       name[i] = p[i];
 127   }
 128
 129   if (status != NULL)
 130     *status = (val == 0) ? 0 : errno;
 131 }
 132 iexport(hostnm_i8_sub);
 133
 134 extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type);
 135 export_proto(hostnm);
 136
 137 GFC_INTEGER_4
 138 hostnm (char *name, gfc_charlen_type name_len)
 139 {
 140   GFC_INTEGER_4 val;
 141   hostnm_i4_sub (name, &val, name_len);
 142   return val;
 143 }
 144 #endif