1258945Sroberto/*
2258945Sroberto * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
3258945Sroberto * Copyright (C) 2001  Internet Software Consortium.
4258945Sroberto *
5258945Sroberto * Permission to use, copy, modify, and/or distribute this software for any
6258945Sroberto * purpose with or without fee is hereby granted, provided that the above
7258945Sroberto * copyright notice and this permission notice appear in all copies.
8258945Sroberto *
9258945Sroberto * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10258945Sroberto * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11258945Sroberto * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12258945Sroberto * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13258945Sroberto * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14258945Sroberto * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15258945Sroberto * PERFORMANCE OF THIS SOFTWARE.
16258945Sroberto */
17258945Sroberto
18280849Scy/* $Id: strerror.c,v 1.10 2009/02/16 23:48:04 tbox Exp $ */
19258945Sroberto
20258945Sroberto/*! \file */
21258945Sroberto
22258945Sroberto#include <config.h>
23258945Sroberto
24258945Sroberto#include <stdio.h>
25258945Sroberto#include <string.h>
26258945Sroberto
27258945Sroberto#include <isc/mutex.h>
28258945Sroberto#include <isc/once.h>
29258945Sroberto#include <isc/print.h>
30258945Sroberto#include <isc/strerror.h>
31258945Sroberto#include <isc/util.h>
32258945Sroberto
33258945Sroberto#include "l_stdlib.h"		/* NTP local change */
34258945Sroberto
35258945Sroberto#ifdef HAVE_STRERROR
36258945Sroberto/*%
37258945Sroberto * We need to do this this way for profiled locks.
38258945Sroberto */
39258945Srobertostatic isc_mutex_t isc_strerror_lock;
40258945Srobertostatic void init_lock(void) {
41258945Sroberto	RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS);
42258945Sroberto}
43258945Sroberto#else
44258945Srobertoextern const char * const sys_errlist[];
45258945Srobertoextern const int sys_nerr;
46258945Sroberto#endif
47258945Sroberto
48258945Srobertovoid
49258945Srobertoisc__strerror(int num, char *buf, size_t size) {
50258945Sroberto#ifdef HAVE_STRERROR
51258945Sroberto	char *msg;
52258945Sroberto	unsigned int unum = (unsigned int)num;
53258945Sroberto	static isc_once_t once = ISC_ONCE_INIT;
54258945Sroberto
55258945Sroberto	REQUIRE(buf != NULL);
56258945Sroberto
57258945Sroberto	RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS);
58258945Sroberto
59258945Sroberto	LOCK(&isc_strerror_lock);
60258945Sroberto	msg = strerror(num);
61258945Sroberto	if (msg != NULL)
62258945Sroberto		snprintf(buf, size, "%s", msg);
63258945Sroberto	else
64258945Sroberto		snprintf(buf, size, "Unknown error: %u", unum);
65258945Sroberto	UNLOCK(&isc_strerror_lock);
66258945Sroberto#else
67258945Sroberto	unsigned int unum = (unsigned int)num;
68258945Sroberto
69258945Sroberto	REQUIRE(buf != NULL);
70258945Sroberto
71258945Sroberto	if (num >= 0 && num < sys_nerr)
72258945Sroberto		snprintf(buf, size, "%s", sys_errlist[num]);
73258945Sroberto	else
74258945Sroberto		snprintf(buf, size, "Unknown error: %u", unum);
75258945Sroberto#endif
76258945Sroberto}
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