1 // Copyright Vladimir Prus 2004.
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE_1_0.txt
4 // or copy at http://www.boost.org/LICENSE_1_0.txt)
5 
6 #ifndef BOOST_ENVIRONMENT_ITERATOR_VP_2004_05_14
7 #define BOOST_ENVIRONMENT_ITERATOR_VP_2004_05_14
8 
9 #include "eof_iterator.hpp"
10 
11 #include <utility>
12 #include <string>
13 #include <cassert>
14 
15 namespace boost {
16 
17     class environment_iterator
18         : public eof_iterator<environment_iterator,
19                               std::pair<std::string, std::string> >
20     {
21     public:
environment_iterator(char ** environment)22         environment_iterator(char** environment)
23         : m_environment(environment)
24         {
25             get();
26         }
27 
environment_iterator()28         environment_iterator()
29         {
30             found_eof();
31         }
32 
get()33         void get()
34         {
35             if (*m_environment == 0)
36                 found_eof();
37             else {
38                 std::string s(*m_environment);
39                 std::string::size_type n = s.find('=');
40                 assert(n != s.npos);
41                 value().first = s.substr(0, n);
42                 value().second = s.substr(n+1);
43 
44                 ++m_environment;
45             }
46         }
47 
48     private:
49         char** m_environment;
50     };
51 }
52 #endif
53