How can I get the line number of an INI file where a specific option or section is found using C ?

Cross-platform way to get line number of an INI file where given option was found

Problem:

Looking for a C library (like boost::program_options) that can return the line number of an INI file where a given option or section was found.

Use cases:

1. Ask the library to find the value "vvv" in the section "[SSS]." The library should return the line number where "vvv" is found in the "[SSS]" section or -1. This allows us to say, for example, "line 55: vvv must be
2. Iterate through the INI file for sections and validate their names. When an unknown section is found, we can report "line 55: section [Hahaha] is unknown."

Response:

Exploiting the possibilities of Boost Spirit, a solution was crafted using line_pos_iterator.

Implementation Details:

• POSITIONSINFO = 0:

  • Input is streaming.
  • Output is in raw string format, or map> for sections.

• POSITIONSINFO = 1:

  • Input is buffered.
  • Output is in textnode_t format:

  <code class="cpp">struct textnode_t {
    int sline, eline, scol, ecol;
    string_t text;
  };</code>

  • This enables the resulting map> to report the exact line and column starting and ending points for individual text elements.
  • Comments (#, / ... / style) are implemented.
  • Whitespace is tolerated.
  • De-escaping of slashes is left as an exercise.
  • Errors are reported with full position information when enabled.

Code Snippet:

<code class="cpp">#include <map>
#include <string>
#include <iterator>
#include <boost>

template <typename s="std::string," typename cmp="std::less<S">>
class IniFile {
public:
    IniFile(Cmp cmp = Cmp()) : _cmp(cmp) {}

    IniFile(const std::string& filename, Cmp cmp = Cmp()) : _cmp(cmp) { open(filename); }

    void open(const std::string& filename);

typedef S string_t;
#if POSITIONINFO
    struct textnode_t {
        int sline, eline,
            scol, ecol;
        string_t text;

        // ...
    };
#else
    typedef string_t textnode_t;
#endif

typedef std::pair<textnode_t textnode_t> keyvalue_t;
typedef std::map<textnode_t textnode_t> section_t;
typedef std::map<textnode_t section_t> sections_t;

private:
    Cmp _cmp;
};</textnode_t></textnode_t></textnode_t></typename></boost></iterator></string></map></code>

Additional Resources:

• [Gist with complete code, makefile, and example.ini](https://gist.github.com/1425972)
• [Boost Spirit documentation](https://www.boost.org/doc/libs/1_65_1/libs/spirit/doc/)

Important Note: The provided solution does not require C 11 support, but it was used to dump the result of the parse.

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