How Can I Parse Command-Line Arguments in C ?

Parsing Command Line Arguments in C

This article explores various methods for parsing command-line arguments in C , providing a detailed analysis and code examples for each approach.

One straightforward method is to utilize the std::find function from the standard library. This approach is suitable for simple command-line options, such as searching for a single-word option (-h for help) or retrieving the file name after the -f argument.

#include <algorithm>

char* getCmdOption(char ** begin, char ** end, const std::string &amp; option)
{
    char ** itr = std::find(begin, end, option);
    if (itr != end &amp;&amp; ++itr != end)
    {
        return *itr;
    }
    return 0;
}

bool cmdOptionExists(char** begin, char** end, const std::string&amp; option)
{
    return std::find(begin, end, option) != end;
}

To enhance this approach, encapsulating these functions within a class can provide added convenience.

class InputParser{
    public:
        InputParser (int &argc, char **argv){
            for (int i=1; i < argc; ++i)
                this->tokens.push_back(std::string(argv[i]));
        }
        /// @author iain
        const std::string&amp; getCmdOption(const std::string &amp;option) const{
            std::vector<std::string>::const_iterator itr;
            itr =  std::find(this->tokens.begin(), this->tokens.end(), option);
            if (itr != this->tokens.end() &amp;&amp; ++itr != this->tokens.end()){
                return *itr;
            }
            static const std::string empty_string("");
            return empty_string;
        }
        /// @author iain
        bool cmdOptionExists(const std::string &amp;option) const{
            return std::find(this->tokens.begin(), this->tokens.end(), option)
                   != this->tokens.end();
        }
    private:
        std::vector <std::string> tokens;
};

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