1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)strerror.c	8.1 (Berkeley) 6/4/93";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include "namespace.h"
39#if defined(NLS)
40#include <nl_types.h>
41#endif
42#include <limits.h>
43#include <errno.h>
44#include <stdlib.h>
45#include <string.h>
46#include <signal.h>
47#include "reentrant.h"
48#include "un-namespace.h"
49
50#define	UPREFIX		"Unknown signal"
51
52static char		sig_ebuf[NL_TEXTMAX];
53static char		sig_ebuf_err[NL_TEXTMAX];
54static once_t		sig_init_once = ONCE_INITIALIZER;
55static thread_key_t	sig_key;
56static int		sig_keycreated = 0;
57
58static void
59sig_keycreate(void)
60{
61	sig_keycreated = (thr_keycreate(&sig_key, free) == 0);
62}
63
64static char *
65sig_tlsalloc(void)
66{
67	char *ebuf = NULL;
68
69	if (thr_main() != 0)
70		ebuf = sig_ebuf;
71	else {
72		if (thr_once(&sig_init_once, sig_keycreate) != 0 ||
73		    !sig_keycreated)
74			goto thr_err;
75		if ((ebuf = thr_getspecific(sig_key)) == NULL) {
76			if ((ebuf = malloc(sizeof(sig_ebuf))) == NULL)
77				goto thr_err;
78			if (thr_setspecific(sig_key, ebuf) != 0) {
79				free(ebuf);
80				ebuf = NULL;
81				goto thr_err;
82			}
83		}
84	}
85thr_err:
86	if (ebuf == NULL)
87		ebuf = sig_ebuf_err;
88	return (ebuf);
89}
90
91/* XXX: negative 'num' ? (REGR) */
92char *
93strsignal(int num)
94{
95	char *ebuf;
96	char tmp[20];
97	size_t n;
98	int signum;
99	char *t, *p;
100
101#if defined(NLS)
102	int saved_errno = errno;
103	nl_catd catd;
104	catd = catopen("libc", NL_CAT_LOCALE);
105#endif
106
107	ebuf = sig_tlsalloc();
108
109	if (num > 0 && num < sys_nsig) {
110		n = strlcpy(ebuf,
111#if defined(NLS)
112			catgets(catd, 2, num, sys_siglist[num]),
113#else
114			sys_siglist[num],
115#endif
116			sizeof(sig_ebuf));
117	} else {
118		n = strlcpy(ebuf,
119#if defined(NLS)
120			catgets(catd, 2, 0xffff, UPREFIX),
121#else
122			UPREFIX,
123#endif
124			sizeof(sig_ebuf));
125
126		signum = num;
127		if (num < 0)
128			signum = -signum;
129
130		t = tmp;
131		do {
132			*t++ = "0123456789"[signum % 10];
133		} while (signum /= 10);
134		if (num < 0)
135			*t++ = '-';
136
137		p = (ebuf + n);
138		*p++ = ':';
139		*p++ = ' ';
140
141		for (;;) {
142			*p++ = *--t;
143			if (t <= tmp)
144				break;
145		}
146		*p = '\0';
147	}
148
149#if defined(NLS)
150	catclose(catd);
151	errno = saved_errno;
152#endif
153	return (ebuf);
154}
155