/*

 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * See the COPYRIGHT file distributed with this work for additional

 * information regarding copyright ownership.

 */

/*! \file */

#include <config.h>

#include <stdio.h>

#include <string.h>

#include <isc/mutex.h>

#include <isc/once.h>

#include <isc/print.h>

#include <isc/strerror.h>

#include <isc/util.h>

#ifdef HAVE_STRERROR

/*%

 * We need to do this this way for profiled locks.

 */

static isc_mutex_t isc_strerror_lock;

static void init_lock(void) {

	RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS);

}

#else

extern const char * const sys_errlist[];

extern const int sys_nerr;

#endif

void

isc__strerror(int num, char *buf, size_t size) {

#ifdef HAVE_STRERROR

	char *msg;

	unsigned int unum = (unsigned int)num;

	static isc_once_t once = ISC_ONCE_INIT;

	REQUIRE(buf != NULL);

	RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS);

	LOCK(&isc_strerror_lock);

	msg = strerror(num);

	if (msg != NULL)

		snprintf(buf, size, "%s", msg);

	else

		snprintf(buf, size, "Unknown error: %u", unum);

	UNLOCK(&isc_strerror_lock);

#else

	unsigned int unum = (unsigned int)num;

	REQUIRE(buf != NULL);

	if (num >= 0 && num < sys_nerr)

		snprintf(buf, size, "%s", sys_errlist[num]);

	else

		snprintf(buf, size, "Unknown error: %u", unum);

#endif

}