1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)strerror.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: releng/10.2/lib/libc/string/strsignal.c 251069 2013-05-28 20:57:40Z emaste $");
35
36#include "namespace.h"
37#if defined(NLS)
38#include <nl_types.h>
39#endif
40#include <limits.h>
41#include <errno.h>
42#include <stdlib.h>
43#include <string.h>
44#include <signal.h>
45#include "reentrant.h"
46#include "un-namespace.h"
47
48#define	UPREFIX		"Unknown signal"
49
50static char		sig_ebuf[NL_TEXTMAX];
51static char		sig_ebuf_err[NL_TEXTMAX];
52static once_t		sig_init_once = ONCE_INITIALIZER;
53static thread_key_t	sig_key;
54static int		sig_keycreated = 0;
55
56static void
57sig_keycreate(void)
58{
59	sig_keycreated = (thr_keycreate(&sig_key, free) == 0);
60}
61
62static char *
63sig_tlsalloc(void)
64{
65	char *ebuf = NULL;
66
67	if (thr_main() != 0)
68		ebuf = sig_ebuf;
69	else {
70		if (thr_once(&sig_init_once, sig_keycreate) != 0 ||
71		    !sig_keycreated)
72			goto thr_err;
73		if ((ebuf = thr_getspecific(sig_key)) == NULL) {
74			if ((ebuf = malloc(sizeof(sig_ebuf))) == NULL)
75				goto thr_err;
76			if (thr_setspecific(sig_key, ebuf) != 0) {
77				free(ebuf);
78				ebuf = NULL;
79				goto thr_err;
80			}
81		}
82	}
83thr_err:
84	if (ebuf == NULL)
85		ebuf = sig_ebuf_err;
86	return (ebuf);
87}
88
89/* XXX: negative 'num' ? (REGR) */
90char *
91strsignal(int num)
92{
93	char *ebuf;
94	char tmp[20];
95	size_t n;
96	int signum;
97	char *t, *p;
98
99#if defined(NLS)
100	int saved_errno = errno;
101	nl_catd catd;
102	catd = catopen("libc", NL_CAT_LOCALE);
103#endif
104
105	ebuf = sig_tlsalloc();
106
107	if (num > 0 && num < sys_nsig) {
108		n = strlcpy(ebuf,
109#if defined(NLS)
110			catgets(catd, 2, num, sys_siglist[num]),
111#else
112			sys_siglist[num],
113#endif
114			sizeof(sig_ebuf));
115	} else {
116		n = strlcpy(ebuf,
117#if defined(NLS)
118			catgets(catd, 2, 0xffff, UPREFIX),
119#else
120			UPREFIX,
121#endif
122			sizeof(sig_ebuf));
123
124		signum = num;
125		if (num < 0)
126			signum = -signum;
127
128		t = tmp;
129		do {
130			*t++ = "0123456789"[signum % 10];
131		} while (signum /= 10);
132		if (num < 0)
133			*t++ = '-';
134
135		p = (ebuf + n);
136		*p++ = ':';
137		*p++ = ' ';
138
139		for (;;) {
140			*p++ = *--t;
141			if (t <= tmp)
142				break;
143		}
144		*p = '\0';
145	}
146
147#if defined(NLS)
148	catclose(catd);
149	errno = saved_errno;
150#endif
151	return (ebuf);
152}
153