libgfortran/intrinsics/hostnm.c

   1 /* Implementation of the HOSTNM intrinsic.
   2    Copyright (C) 2005, 2007 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 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Libgfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 Boston, MA 02110-1301, USA.  */
  30
  31 #include "libgfortran.h"
  32
  33 #include <errno.h>
  34 #include <string.h>
  35
  36 #ifdef HAVE_UNISTD_H
  37 #include <unistd.h>
  38 #endif
  39
  40
  41 /* Windows32 version */
  42 #if defined __MINGW32__ && !defined  HAVE_GETHOSTNAME
  43 #define WIN32_LEAN_AND_MEAN
  44 #include <windows.h>
  45 #include <errno.h>
  46
  47 static int
  48 w32_gethostname (char *name, size_t len)
  49 {
  50   /* We could try the WinSock API gethostname, but that will
  51      fail if WSAStartup function has has not been called.  We don't
  52     really need a name that will be understood by socket API, so avoid
  53     unnecessary dependence on WinSock libraries by using
  54     GetComputerName instead.  */
  55
  56   /* On Win9x GetComputerName fails if the input size is less
  57      than MAX_COMPUTERNAME_LENGTH + 1.  */
  58   char buffer[MAX_COMPUTERNAME_LENGTH + 1];
  59   DWORD size =  sizeof (buffer);
  60
  61   if (!GetComputerName (buffer, &size))
  62     return -1;
  63
  64   if ((size = strlen (buffer) + 1)  > len)
  65     {
  66       errno = EINVAL;
  67       /* Truncate as per POSIX spec.  We do not NUL-terminate. */
  68       size = len;
  69     }
  70   memcpy (name, buffer, (size_t) size);
  71
  72   return 0;
  73 }
  74
  75 #undef gethostname
  76 #define gethostname w32_gethostname
  77 #define  HAVE_GETHOSTNAME 1
  78
  79 #endif
  80
  81
  82 /* SUBROUTINE HOSTNM(NAME, STATUS)
  83    CHARACTER(len=*), INTENT(OUT) :: NAME
  84    INTEGER, INTENT(OUT), OPTIONAL :: STATUS  */
  85
  86 #ifdef HAVE_GETHOSTNAME
  87 extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
  88 iexport_proto(hostnm_i4_sub);
  89
  90 void
  91 hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len)
  92 {
  93   int val, i;
  94   char *p;
  95
  96   memset (name, ' ', name_len);
  97   p = gfc_alloca (name_len + 1);
  98
  99   val = gethostname (p, name_len);
 100
 101   if (val == 0)
 102   {
 103     i = -1;
 104     while (i < name_len && p[++i] != '\0')
 105       name[i] = p[i];
 106   }
 107
 108   if (status != NULL)
 109     *status = (val == 0) ? 0 : errno;
 110 }
 111 iexport(hostnm_i4_sub);
 112
 113 extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
 114 iexport_proto(hostnm_i8_sub);
 115
 116 void
 117 hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len)
 118 {
 119   int val, i;
 120   char *p;
 121
 122   memset (name, ' ', name_len);
 123   p = gfc_alloca (name_len + 1);
 124
 125   val = gethostname (p, name_len);
 126
 127   if (val == 0)
 128   {
 129     i = -1;
 130     while (i < name_len && p[++i] != '\0')
 131       name[i] = p[i];
 132   }
 133
 134   if (status != NULL)
 135     *status = (val == 0) ? 0 : errno;
 136 }
 137 iexport(hostnm_i8_sub);
 138
 139 extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type);
 140 export_proto(hostnm);
 141
 142 GFC_INTEGER_4
 143 hostnm (char *name, gfc_charlen_type name_len)
 144 {
 145   GFC_INTEGER_4 val;
 146   hostnm_i4_sub (name, &val, name_len);
 147   return val;
 148 }
 149 #endif