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ghostname_unix.cpp
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1 //
2 // Copyright (C) 2001-2013 Graeme Walker <graeme_walker@users.sourceforge.net>
3 //
4 // This program is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, either version 3 of the License, or
7 // (at your option) any later version.
8 //
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License
15 // along with this program. If not, see <http://www.gnu.org/licenses/>.
16 // ===
17 //
18 // ghostname_unix.cpp
19 //
20
21 #include "gdef.h"
22 #include "ghostname.h"
23 #include "gstr.h"
24 #include "genvironment.h"
25 #include <sys/utsname.h>
26
27 std::string G::hostname()
28 {
29 struct utsname info ;
30 int rc = ::uname( &info ) ;
31 if( rc == -1 )
32 return std::string() ;
33
34 std::string name = std::string(info.nodename) ;
35 std::string::size_type pos = name.find('.') ;
36 if( pos != std::string::npos )
37 name = name.substr( 0U , pos ) ;
38
39 // pathologically "uname -n" can be empty, so
40 // allow "export HOSTNAME=localhost" as a
41 // workround
42 //
43 if( name.empty() )
44 {
45 name = G::Str::toPrintableAscii(
46 G::Environment::get("HOSTNAME",std::string()) , '_' ) ;
47 }
48
49 return name ;
50 }
51
G::Environment::get
static std::string get(const std::string &name, const std::string &default_)
Returns the environment variable value or the given default.
Definition: genvironment_unix.cpp:25
md5::size_type
std::string::size_type size_type
A std::size_t type.
Definition: md5.h:43
G::hostname
std::string hostname()
Returns the hostname.
Definition: ghostname_unix.cpp:27
ghostname.h
gstr.h
genvironment.h
G::Str::toPrintableAscii
static std::string toPrintableAscii(char c, char escape= '\\')
Returns a 7-bit printable representation of the given input character.
Definition: gstr.cpp:521