// SPDX-License-Identifier: ISC

/*

 * Copyright (c) 2016  David Lamparter, for NetDEF, Inc.

 */

#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;

    }

}