zebra: Allow json output to give a bit more data

[mirror_frr.git] / lib / hook.c

/*
 * 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.
 */

#include "memory.h"
#include "hook.h"

DEFINE_MTYPE_STATIC(LIB, HOOK_ENTRY, "Hook entry")

void _hook_register(struct hook *hook, void *funcptr, void *arg, bool has_arg,
		    struct frrmod_runtime *module, const char *funcname,
		    int priority)
{
	struct hookent *he = XCALLOC(MTYPE_HOOK_ENTRY, sizeof(*he)), **pos;
	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;
			XFREE(MTYPE_HOOK_ENTRY, he);
			break;
		}
}