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* struct arg_xxx *parent = ptr to the arg_xxx struct in the argtable.
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* FILE *fp = output stream
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* int errorcode = the error code returned by the scanfn routine
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* const char *progname = the same progname string passed to arg_print_errors()
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static void errorfn(struct arg_xxx *parent, FILE *fp, int errorcode, const char *argval, const char *progname)