libgfortran/intrinsics/hostnm.c

   1 /* Implementation of the HOSTNM intrinsic.
   2    Copyright (C) 2005 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 "config.h"
  32 #include "libgfortran.h"
  33
  34 #include <errno.h>
  35 #include <string.h>
  36
  37 #ifdef HAVE_UNISTD_H
  38 #include <unistd.h>
  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 extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
  89 iexport_proto(hostnm_i4_sub);
  90
  91 void
  92 hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len)
  93 {
  94   int val, i;
  95   char *p;
  96
  97   memset (name, ' ', name_len);
  98   p = gfc_alloca (name_len + 1);
  99
 100   val = gethostname (p, name_len);
 101
 102   if (val == 0)
 103   {
 104     i = -1;
 105     while (i < name_len && p[++i] != '\0')
 106       name[i] = p[i];
 107   }
 108
 109   if (status != NULL)
 110     *status = (val == 0) ? 0 : errno;
 111 }
 112 iexport(hostnm_i4_sub);
 113
 114 extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
 115 iexport_proto(hostnm_i8_sub);
 116
 117 void
 118 hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len)
 119 {
 120   int val, i;
 121   char *p;
 122
 123   memset (name, ' ', name_len);
 124   p = gfc_alloca (name_len + 1);
 125
 126   val = gethostname (p, name_len);
 127
 128   if (val == 0)
 129   {
 130     i = -1;
 131     while (i < name_len && p[++i] != '\0')
 132       name[i] = p[i];
 133   }
 134
 135   if (status != NULL)
 136     *status = (val == 0) ? 0 : errno;
 137 }
 138 iexport(hostnm_i8_sub);
 139
 140 extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type);
 141 export_proto(hostnm);
 142
 143 GFC_INTEGER_4
 144 hostnm (char *name, gfc_charlen_type name_len)
 145 {
 146   GFC_INTEGER_4 val;
 147   hostnm_i4_sub (name, &val, name_len);
 148   return val;
 149 }
 150 #endif