1 files changed, 64 insertions, 0 deletions
diff --git a/isisd/isis_flags.c b/isisd/isis_flags.c
new file mode 100644
index 0000000..a621b4b
--- /dev/null
+++ b/isisd/isis_flags.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * IS-IS Rout(e)ing protocol - isis_flags.c
+ *                             Routines for manipulation of SSN and SRM flags
+ *
+ * Copyright (C) 2001,2002   Sampo Saaristo
+ *                           Tampere University of Technology
+ *                           Institute of Communications Engineering
+ */
+
+#include <zebra.h>
+#include "log.h"
+#include "linklist.h"
+
+#include "isisd/isis_constants.h"
+#include "isisd/isis_common.h"
+#include "isisd/isis_flags.h"
+
+void flags_initialize(struct flags *flags)
+{
+	flags->maxindex = 0;
+	flags->free_idcs = NULL;
+}
+
+long int flags_get_index(struct flags *flags)
+{
+	struct listnode *node;
+	long int index;
+
+	if (flags->free_idcs == NULL || flags->free_idcs->count == 0) {
+		index = flags->maxindex++;
+	} else {
+		node = listhead(flags->free_idcs);
+		index = (long int)listgetdata(node);
+		listnode_delete(flags->free_idcs, (void *)index);
+		index--;
+	}
+
+	return index;
+}
+
+void flags_free_index(struct flags *flags, long int index)
+{
+	if (index + 1 == flags->maxindex) {
+		flags->maxindex--;
+		return;
+	}
+
+	if (flags->free_idcs == NULL) {
+		flags->free_idcs = list_new();
+	}
+
+	listnode_add(flags->free_idcs, (void *)(index + 1));
+
+	return;
+}
+
+int flags_any_set(uint32_t *flags)
+{
+	uint32_t zero[ISIS_MAX_CIRCUITS];
+	memset(zero, 0x00, ISIS_MAX_CIRCUITS * 4);
+
+	return bcmp(flags, zero, ISIS_MAX_CIRCUITS * 4);
+}