* 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.
*
+ * 'anchor' is the 1-based line at which relative range specifications
+ * should be anchored. Absolute ranges are unaffected by this value.
+ *
* 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.
extern int parse_range_arg(const char *arg,
nth_line_fn_t nth_line_cb,
- void *cb_data, long lines,
+ void *cb_data, long lines, long anchor,
long *begin, long *end,
const char *path);