ghostname_unix.cpp

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//
// Copyright (C) 2017 Graeme Walker
// 
// This program 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.
// 
// This program 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.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
// ===
//
// ghostname_unix.cpp
//

#include "gdef.h"
#include "ghostname.h"
#include "gstr.h"
#include "genvironment.h"
#include <sys/utsname.h>

std::string G::hostname()
{
    struct utsname info ;
    int rc = ::uname( &info ) ;
    if( rc == -1 ) 
        return std::string() ;

    std::string name = std::string(info.nodename) ;
    std::string::size_type pos = name.find('.') ;
    if( pos != std::string::npos )
        name = name.substr( 0U , pos ) ;

    // pathologically "uname -n" can be empty, so
    // allow "export HOSTNAME=localhost" as a
    // workround
    //
    if( name.empty() )
    {
        name = G::Str::toPrintableAscii( 
            G::Environment::get("HOSTNAME",std::string()) , '_' ) ;
    }

    return name ;
}

/// \file ghostname_unix.cpp