Don't crash fast-import if the marks cannot be exported.

diff --git a/interpolate.h b/interpolate.h
index 00c63a5622da8545f46fb6b170951b224679bc73..190a180b587aa565ae2ae71f9eb068ad75db168f 100644 (file)
--- a/interpolate.h
+++ b/interpolate.h
@@ -5,14 +5,22 @@
 #ifndef INTERPOLATE_H
 #define INTERPOLATE_H
 
+/*
+ * Convert a NUL-terminated string in buffer orig,
+ * performing substitutions on %-named sub-strings from
+ * the interpretation table.
+ */
 
 struct interp {
        char *name;
        char *value;
 };
 
+extern void interp_set_entry(struct interp *table, int slot, const char *value);
+extern void interp_clear_table(struct interp *table, int ninterps);
+
 extern int interpolate(char *result, int reslen,
-                      char *orig,
-                      struct interp *interps, int ninterps);
+                      const char *orig,
+                      const struct interp *interps, int ninterps);
 
 #endif /* INTERPOLATE_H */