1/*	$NetBSD: strerror.c,v 1.6 2020/05/25 20:47:23 christos Exp $	*/
2
3/*
4 * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 2001  Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20/* Id: strerror.c,v 1.10 2009/02/16 23:48:04 tbox Exp  */
21
22/*! \file */
23
24#include <config.h>
25
26#include <stdio.h>
27#include <string.h>
28
29#include <isc/mutex.h>
30#include <isc/once.h>
31#include <isc/print.h>
32#include <isc/strerror.h>
33#include <isc/util.h>
34
35#include "l_stdlib.h"		/* NTP local change */
36
37#ifdef HAVE_STRERROR
38/*%
39 * We need to do this this way for profiled locks.
40 */
41static isc_mutex_t isc_strerror_lock;
42static void init_lock(void) {
43	RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS);
44}
45#else
46extern const char * const sys_errlist[];
47extern const int sys_nerr;
48#endif
49
50void
51isc__strerror(int num, char *buf, size_t size) {
52#ifdef HAVE_STRERROR
53	char *msg;
54	unsigned int unum = (unsigned int)num;
55	static isc_once_t once = ISC_ONCE_INIT;
56
57	REQUIRE(buf != NULL);
58
59	RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS);
60
61	LOCK(&isc_strerror_lock);
62	msg = strerror(num);
63	if (msg != NULL)
64		snprintf(buf, size, "%s", msg);
65	else
66		snprintf(buf, size, "Unknown error: %u", unum);
67	UNLOCK(&isc_strerror_lock);
68#else
69	unsigned int unum = (unsigned int)num;
70
71	REQUIRE(buf != NULL);
72
73	if (num >= 0 && num < sys_nerr)
74		snprintf(buf, size, "%s", sys_errlist[num]);
75	else
76		snprintf(buf, size, "Unknown error: %u", unum);
77#endif
78}
79