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-rw-r--r--line-range.h36
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diff --git a/line-range.h b/line-range.h
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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,
+ const char *path);
+
+/*
+ * 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.
+ */
+
+extern const char *skip_range_arg(const char *arg);
+
+#endif /* LINE_RANGE_H */