* Copyright (c) 1988 Regents of the University of California.

/* $NetBSD: strerror_r.c,v 1.6 2024/06/08 21:35:18 joerg Exp $ */

/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: strerror_r.c,v 1.6 2024/06/08 21:35:18 joerg Exp $");

#include "namespace.h"
#include <assert.h>
#include <atomic.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h> /* for sys_nerr on FreeBSD */
#ifdef NLS
#include <limits.h>
#include <nl_types.h>
#define __SETLOCALE_SOURCE__
#include <locale.h>
#include "setlocale_local.h"
#endif

#include "extern.h"

#define UPREFIX "Unknown error: %d"

__weak_alias(strerror_r, _strerror_r)

#ifdef NLS
static void
load_errlist(locale_t loc)
{
const char **errlist;
char *errlist_prefix;
int i;
nl_catd catd;
catd = catopen_l("libc", NL_CAT_LOCALE, loc);

if (loc->cache->errlist_prefix == NULL) {
errlist_prefix = strdup(catgets(catd, 1, 0xffff, UPREFIX));
if (errlist_prefix == NULL)
goto cleanup2;

membar_release();
if (atomic_cas_ptr(__UNCONST(&loc->cache->errlist_prefix),
NULL, errlist_prefix) != NULL)
free(errlist_prefix);
}

if (loc->cache->errlist)
goto cleanup2;

errlist = calloc(sys_nerr, sizeof(*errlist));
if (errlist == NULL)
goto cleanup2;
for (i = 0; i < sys_nerr; ++i) {
errlist[i] = strdup(catgets(catd, 1, i, sys_errlist[i]));
if (errlist[i] == NULL)
goto cleanup;
}
membar_release();
if (atomic_cas_ptr(__UNCONST(&loc->cache->errlist), NULL, errlist) != NULL)
goto cleanup;
goto cleanup2;

cleanup:
for (i = 0; i < sys_nerr; ++i)
free(__UNCONST(errlist[i]));
free(errlist);
cleanup2:
catclose(catd);
}
#endif

int
_strerror_lr(int num, char *buf, size_t buflen, locale_t loc)
{
unsigned int errnum = num;
int retval = 0;
size_t slen;
int saved_errno = errno;
#ifdef NLS
const char * const *errlist;
const char *errlist_prefix;
#endif

_DIAGASSERT(buf != NULL);

if (errnum < (unsigned int) sys_nerr) {
#ifdef NLS
errlist = *loc->cache->errlistp;
membar_datadep_consumer();
if (errlist == NULL) {
load_errlist(loc);
errlist = *loc->cache->errlistp;
membar_datadep_consumer();
if (errlist == NULL)
errlist = *LC_C_LOCALE->cache->errlistp;
}
slen = strlcpy(buf, errlist[errnum], buflen);
#else
slen = strlcpy(buf, sys_errlist[errnum], buflen);
#endif
} else {
#ifdef NLS
errlist_prefix = loc->cache->errlist_prefix;
membar_datadep_consumer();
if (errlist_prefix == NULL) {
load_errlist(loc);
errlist_prefix = loc->cache->errlist_prefix;
membar_datadep_consumer();
if (errlist_prefix == NULL)
errlist_prefix = LC_C_LOCALE->cache->errlist_prefix;
}
slen = snprintf_l(buf, buflen, loc, errlist_prefix, num);
#else
slen = snprintf(buf, buflen, UPREFIX, num);
#endif
retval = EINVAL;
}

if (slen >= buflen)
retval = ERANGE;

errno = saved_errno;

return retval;
}

int
strerror_r(int num, char *buf, size_t buflen)
{
#ifdef NLS
return _strerror_lr(num, buf, buflen, _current_locale());
#else
return _strerror_lr(num, buf, buflen, NULL);
#endif
}