argin.h
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1 /*
2  * Copyright (C) 2011 Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * As a special exception, you may use this file as part of a free
10  * software library without restriction. Specifically, if other files
11  * instantiate templates or use macros or inline functions from this
12  * file, or you compile this file and link it with other files to
13  * produce an executable, this file does not by itself cause the
14  * resulting executable to be covered by the GNU General Public
15  * License. This exception does not however invalidate any other
16  * reasons why the executable file might be covered by the GNU Library
17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this library; if not, write to the Free Software
26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 
29 #ifndef CXXTOOLS_STDIN_H
30 #define CXXTOOLS_STDIN_H
31 
32 #include <iostream>
33 #include <iostream>
34 #include <fstream>
35 #include <cxxtools/arg.h>
36 
37 namespace cxxtools
38 {
78  class ArgIn : public std::istream
79  {
80  std::ifstream _ifile;
81 
82  void doInit(const Arg<const char*>& ifile)
83  {
84  std::streambuf* buf;
85  if (ifile.isSet())
86  {
87  _ifile.open(ifile);
88  buf = _ifile.rdbuf();
89  }
90  else
91  buf = std::cin.rdbuf();
92  init(buf);
93  }
94 
95  public:
97  ArgIn(int& argc, char* argv[], char option)
98  : std::istream(0)
99  {
100  Arg<const char*> ifile(argc, argv, option);
101  doInit(ifile);
102  }
103 
105  ArgIn(int& argc, char* argv[], const char* option)
106  : std::istream(0)
107  {
108  Arg<const char*> ifile(argc, argv, option);
109  doInit(ifile);
110  }
111 
113  ArgIn(int& argc, char* argv[])
114  : std::istream(0)
115  {
116  Arg<const char*> ifile(argc, argv);
117  doInit(ifile);
118  }
119 
121  bool redirected() const
122  {
123  return rdbuf() != std::cin.rdbuf();
124  }
125  };
126 }
127 
128 #endif // CXXTOOLS_STDIN_H