149Salm/*	$NetBSD: assert.c,v 1.18 2017/05/15 16:09:09 christos Exp $	*/
249Salm
349Salm/*-
449Salm * Copyright (c) 1992, 1993
549Salm *	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#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)assert.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: assert.c,v 1.18 2017/05/15 16:09:09 christos Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include <sys/types.h>
43
44#include <assert.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <unistd.h>
48#include <syslog.h>
49#include "extern.h"
50
51static int
52fmtassert(char *buf, size_t len, const char *file, int line,
53    const char *function, const char *failedexpr)
54{
55	return snprintf_ss(buf, len,
56	    "assertion \"%s\" failed: file \"%s\", line %d%s%s%s\n",
57	    failedexpr, file, line,
58	    function ? ", function \"" : "",
59	    function ? function : "",
60	    function ? "\"" : "");
61}
62
63void
64__assert13(const char *file, int line, const char *function,
65    const char *failedexpr)
66{
67	char buf[1024];
68	int l = fmtassert(buf, sizeof(buf), file, line, function, failedexpr);
69	if (l < 0)
70		abort();
71	(void)write(STDERR_FILENO, buf, (size_t)l);
72	abort();
73	/* NOTREACHED */
74}
75
76void
77__assert(const char *file, int line, const char *failedexpr)
78{
79
80	__assert13(file, line, NULL, failedexpr);
81	/* NOTREACHED */
82}
83
84
85enum {
86	DIAGASSERT_ABORT =	1<<0,
87	DIAGASSERT_STDERR =	1<<1,
88	DIAGASSERT_SYSLOG =	1<<2
89};
90
91static int	diagassert_flags = -1;
92
93void
94__diagassert13(const char *file, int line, const char *function,
95    const char *failedexpr)
96{
97	char buf[1024];
98
99	if (diagassert_flags == -1) {
100		char *p;
101
102		diagassert_flags = DIAGASSERT_SYSLOG;
103
104		for (p = getenv("LIBC_DIAGASSERT"); p && *p; p++) {
105			switch (*p) {
106			case 'a':
107				diagassert_flags |= DIAGASSERT_ABORT;
108				break;
109			case 'A':
110				diagassert_flags &= ~DIAGASSERT_ABORT;
111				break;
112			case 'e':
113				diagassert_flags |= DIAGASSERT_STDERR;
114				break;
115			case 'E':
116				diagassert_flags &= ~DIAGASSERT_STDERR;
117				break;
118			case 'l':
119				diagassert_flags |= DIAGASSERT_SYSLOG;
120				break;
121			case 'L':
122				diagassert_flags &= ~DIAGASSERT_SYSLOG;
123				break;
124			}
125		}
126	}
127
128	fmtassert(buf, sizeof(buf), file, line, function, failedexpr);
129	if (diagassert_flags & DIAGASSERT_STDERR) {
130		char ebuf[1024];
131		int l = snprintf_ss(ebuf, sizeof(ebuf), "%s: %s\n",
132		    getprogname(), buf);
133		if (l == -1)
134			abort();
135		(void)write(STDERR_FILENO, ebuf, (size_t)l);
136	}
137	if (diagassert_flags & DIAGASSERT_SYSLOG) {
138		struct syslog_data sdata = SYSLOG_DATA_INIT;
139		syslog_ss(LOG_DEBUG | LOG_USER, &sdata, "%s", buf);
140	}
141	if (diagassert_flags & DIAGASSERT_ABORT)
142		abort();
143}
144
145void
146__diagassert(const char *file, int line, const char *failedexpr)
147{
148
149	__diagassert13(file, line, NULL, failedexpr);
150}
151