#ifndef LINE_RANGE_H
#define LINE_RANGE_H
+struct index_state;
+
/*
* Parse one item in an -L begin,end option w.r.t. the notional file
* object 'cb_data' consisting of 'lines' lines.
* 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.
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);
+int parse_range_arg(const char *arg,
+ nth_line_fn_t nth_line_cb,
+ void *cb_data, long lines, long anchor,
+ long *begin, long *end,
+ const char *path, struct index_state *istate);
+
+/*
+ * Scan past a range argument that could be parsed by
+ * 'parse_range_arg', to help the caller determine the start of the
+ * filename in '-L n,m:file' syntax.
+ *
+ * Returns a pointer to the first character after the 'n,m' part, or
+ * NULL in case the argument is obviously malformed.
+ */
+
+const char *skip_range_arg(const char *arg, struct index_state *istate);
#endif /* LINE_RANGE_H */