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#ifndef LINE_RANGE_H
#define LINE_RANGE_H
/*
* Parse one item in an -L begin,end option w.r.t. the notional file
* object 'cb_data' consisting of 'lines' lines.
*
* The 'nth_line_cb' callback is used to determine the start of the
* line 'lno' inside the 'cb_data'. The caller is expected to already
* have a suitable map at hand to make this a constant-time lookup.
*
* Returns 0 in case of success and -1 if there was an error. The
* actual range is stored in *begin and *end. The counting starts
* at 1! In case of error, the caller should show usage message.
*/
typedef const char *(*nth_line_fn_t)(void *data, long lno);
extern int parse_range_arg(const char *arg,
nth_line_fn_t nth_line_cb,
void *cb_data, long lines,
long *begin, long *end);
#endif /* LINE_RANGE_H */
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