libcollectdclient: Add "lcc_identifier_compare".

diff --git a/src/libcollectdclient/client.c b/src/libcollectdclient/client.c
index 0997577..abe3ed8 100644 (file)
--- a/src/libcollectdclient/client.c
+++ b/src/libcollectdclient/client.c
@@ -1069,4 +1069,33 @@ int lcc_string_to_identifier (lcc_connection_t *c, /* {{{ */
   return (0);
 } /* }}} int lcc_string_to_identifier */
 
+int lcc_identifier_compare (const lcc_identifier_t *i0, /* {{{ */
+    const lcc_identifier_t *i1)
+{
+  int status;
+
+  if ((i0 == NULL) && (i1 == NULL))
+    return (0);
+  else if (i0 == NULL)
+    return (-1);
+  else if (i1 == NULL)
+    return (1);
+
+#define CMP_FIELD(f) do {         \
+  status = strcmp (i0->f, i1->f); \
+  if (status != 0)                \
+    return (status);              \
+} while (0);
+
+    CMP_FIELD (host);
+    CMP_FIELD (plugin);
+    CMP_FIELD (plugin_instance);
+    CMP_FIELD (type);
+    CMP_FIELD (type_instance);
+
+#undef CMP_FIELD
+
+    return (0);
+} /* }}} int lcc_identifier_compare */
+
 /* vim: set sw=2 sts=2 et fdm=marker : */

diff --git a/src/libcollectdclient/collectd/client.h b/src/libcollectdclient/collectd/client.h
index 9900353..1494c8d 100644 (file)
--- a/src/libcollectdclient/collectd/client.h
+++ b/src/libcollectdclient/collectd/client.h
@@ -116,6 +116,12 @@ int lcc_identifier_to_string (lcc_connection_t *c,
 int lcc_string_to_identifier (lcc_connection_t *c,
     lcc_identifier_t *ident, const char *string);
 
+/* Compares the identifiers "i0" and "i1" and returns less than zero or greater
+ * than zero if "i0" is smaller than or greater than "i1", respectively. If
+ * "i0" and "i1" are identical, zero is returned. */
+int lcc_identifier_compare (const lcc_identifier_t *i0,
+    const lcc_identifier_t *i1);
+
 LCC_END_DECLS
 
 /* vim: set sw=2 sts=2 et : */