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-rw-r--r--lib/hook.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/hook.c b/lib/hook.c
new file mode 100644
index 0000000..895243a
--- /dev/null
+++ b/lib/hook.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2016 David Lamparter, for NetDEF, Inc.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include "memory.h"
+#include "hook.h"
+
+DEFINE_MTYPE_STATIC(LIB, HOOK_ENTRY, "Hook entry");
+
+void _hook_register(struct hook *hook, struct hookent *stackent, void *funcptr,
+ void *arg, bool has_arg, struct frrmod_runtime *module,
+ const char *funcname, int priority)
+{
+ struct hookent *he, **pos;
+
+ if (!stackent->ent_used)
+ he = stackent;
+ else {
+ he = XCALLOC(MTYPE_HOOK_ENTRY, sizeof(*he));
+ he->ent_on_heap = true;
+ }
+ he->ent_used = true;
+ he->hookfn = funcptr;
+ he->hookarg = arg;
+ he->has_arg = has_arg;
+ he->module = module;
+ he->fnname = funcname;
+ he->priority = priority;
+
+ for (pos = &hook->entries; *pos; pos = &(*pos)->next)
+ if (hook->reverse ? (*pos)->priority < priority
+ : (*pos)->priority >= priority)
+ break;
+
+ he->next = *pos;
+ *pos = he;
+}
+
+void _hook_unregister(struct hook *hook, void *funcptr, void *arg, bool has_arg)
+{
+ struct hookent *he, **prev;
+
+ for (prev = &hook->entries; (he = *prev) != NULL; prev = &he->next)
+ if (he->hookfn == funcptr && he->hookarg == arg
+ && he->has_arg == has_arg) {
+ *prev = he->next;
+ if (he->ent_on_heap)
+ XFREE(MTYPE_HOOK_ENTRY, he);
+ else
+ memset(he, 0, sizeof(*he));
+ break;
+ }
+}