libihash: add hurd_ihash_value_valid

* libihash/ihash.h (hurd_ihash_value_valid): New function.
* libihash/ihash.c (index_empty): Use hurd_ihash_value_valid.

2 files changed, 8 insertions, 2 deletions

diff --git a/libihash/ihash.c b/libihash/ihash.c
index fa29257b..74e9eddd 100644
--- a/libihash/ihash.c
+++ b/libihash/ihash.c
@@ -37,8 +37,7 @@
 static inline int
 index_empty (hurd_ihash_t ht, unsigned int idx)
 {
-  return ht->items[idx].value == _HURD_IHASH_EMPTY
-    || ht->items[idx].value == _HURD_IHASH_DELETED;
+  return ! hurd_ihash_value_valid (ht->items[idx].value);
 }
 
 
diff --git a/libihash/ihash.h b/libihash/ihash.h
index 849a55a2..128027a0 100644
--- a/libihash/ihash.h
+++ b/libihash/ihash.h
@@ -41,6 +41,13 @@ typedef void *hurd_ihash_value_t;
 #define _HURD_IHASH_EMPTY	((hurd_ihash_value_t) 0)
 #define _HURD_IHASH_DELETED	((hurd_ihash_value_t) -1)
 
+/* Test if VALUE is valid.  */
+static inline int
+hurd_ihash_value_valid (hurd_ihash_value_t value)
+{
+  return value != _HURD_IHASH_EMPTY && value != _HURD_IHASH_DELETED;
+}
+
 /* The type of integer we want to use for the keys.  */
 typedef uintptr_t hurd_ihash_key_t;