/*
* Lookup helpers.
*/
-struct definition *lookup_definition(struct definition *definition,
+struct definition *lookup_definition(const struct definition *definition,
const char *field_name);
-struct definition_integer *lookup_integer(struct definition *definition,
+struct definition_integer *lookup_integer(const struct definition *definition,
const char *field_name,
int signedness);
-struct definition_enum *lookup_enum(struct definition *definition,
+struct definition_enum *lookup_enum(const struct definition *definition,
const char *field_name,
int signedness);
-struct definition *lookup_variant(struct definition *definition,
+struct definition *lookup_variant(const struct definition *definition,
const char *field_name);
static inline