1 /**
2  * Copyright © 2016 IBM Corporation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "argument.hpp"
18 
19 #include <algorithm>
20 #include <cassert>
21 #include <iostream>
22 #include <iterator>
23 
24 namespace phosphor
25 {
26 namespace led
27 {
28 
29 const std::string ArgumentParser::true_string = "true";
30 const std::string ArgumentParser::empty_string = "";
31 
32 const char* ArgumentParser::optionstr = "p:?h";
33 const option ArgumentParser::options[] = {
34     {"path", required_argument, nullptr, 'p'},
35     {"help", no_argument, nullptr, 'h'},
36     {0, 0, 0, 0},
37 };
38 
39 ArgumentParser::ArgumentParser(int argc, char** argv)
40 {
41     int option = 0;
42     while (-1 !=
43            (option = getopt_long(argc, argv, optionstr, options, nullptr)))
44     {
45         if ((option == '?') || (option == 'h'))
46         {
47             usage(argv);
48             exit(-1);
49         }
50 
51         auto i = &options[0];
52         while ((i->val != option) && (i->val != 0))
53             ++i;
54 
55         if (i->val)
56             arguments[i->name] = (i->has_arg ? optarg : true_string);
57     }
58 }
59 
60 const std::string& ArgumentParser::operator[](const std::string& opt)
61 {
62     auto i = arguments.find(opt);
63     if (i == arguments.end())
64     {
65         return empty_string;
66     }
67     else
68     {
69         return i->second;
70     }
71 }
72 
73 void ArgumentParser::usage(char** argv)
74 {
75     std::cerr << "Usage: " << argv[0] << " [options]" << std::endl;
76     std::cerr << "Options:" << std::endl;
77     std::cerr << "    --help               Print this menu" << std::endl;
78     std::cerr << "    --path=<path>        absolute path of LED in sysfs; like";
79     std::cerr << " /sys/class/leds/<name>" << std::endl;
80 }
81 } // namespace led
82 } // namespace phosphor
83