libsepol: mark read-only parameters of type_set_ interfaces const

Make it more obvious which parameters are read-only and not being
modified and allow callers to pass const pointers.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>

libsepol/include/sepol/policydb/policydb.h

@@ -667,8 +667,8 @@ extern int scope_destroy(hashtab_key_t key, hashtab_datum_t datum, void *p);
 extern void class_perm_node_init(class_perm_node_t * x);
 extern void type_set_init(type_set_t * x);
 extern void type_set_destroy(type_set_t * x);
-extern int type_set_cpy(type_set_t * dst, type_set_t * src);
-extern int type_set_or_eq(type_set_t * dst, type_set_t * other);
+extern int type_set_cpy(type_set_t * dst, const type_set_t * src);
+extern int type_set_or_eq(type_set_t * dst, const type_set_t * other);
 extern void role_set_init(role_set_t * x);
 extern void role_set_destroy(role_set_t * x);
 extern void avrule_init(avrule_t * x);

libsepol/src/policydb.c

@@ -1747,7 +1747,7 @@ int symtab_insert(policydb_t * pol, uint32_t sym,
 	return retval;
 }
 
-static int type_set_or(type_set_t * dst, type_set_t * a, type_set_t * b)
+static int type_set_or(type_set_t * dst, const type_set_t * a, const type_set_t * b)
 {
 	type_set_init(dst);
 
@@ -1764,7 +1764,7 @@ static int type_set_or(type_set_t * dst, type_set_t * a, type_set_t * b)
 	return 0;
 }
 
-int type_set_cpy(type_set_t * dst, type_set_t * src)
+int type_set_cpy(type_set_t * dst, const type_set_t * src)
 {
 	type_set_init(dst);
 
@@ -1777,7 +1777,7 @@ int type_set_cpy(type_set_t * dst, type_set_t * src)
 	return 0;
 }
 
-int type_set_or_eq(type_set_t * dst, type_set_t * other)
+int type_set_or_eq(type_set_t * dst, const type_set_t * other)
 {
 	int ret;
 	type_set_t tmp;