Argp Help

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The argp_help Function

Normally programs using argp need not be written with particular printing argument-usage-type help messages in mind as the standard -help option is handled automatically by argp. Typical error cases can be handled using argp_usage and argp_error. Argp Helper Functions. However, if it's desirable to print a help message in some context other than parsing the program options, argp offers the argp_help interface.

- Function: void argp_help (const struct argp *argp, FILE *stream, unsigned flags, char *name)

This outputs a help message for the argp parser argp to stream. The type of messages printed will be determined by flags.

Any options such as -help that are implemented automatically by argp itself will not be present in the help output; for this reason it is best to use argp_state_help if calling from within an argp parser function. Argp Helper Functions.

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• Flags :: Specifying what sort of help message to print.