xref: /src/lib/libc/gen/assert.c

/*	$NetBSD: assert.c,v 1.18 2017/05/15 16:09:09 christos Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The 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>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)assert.c	8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: assert.c,v 1.18 2017/05/15 16:09:09 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <sys/types.h>

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include "extern.h"

static int
fmtassert(char *buf, size_t len, const char *file, int line,
    const char *function, const char *failedexpr)
{
	return snprintf_ss(buf, len,
	    "assertion \"%s\" failed: file \"%s\", line %d%s%s%s\n",
	    failedexpr, file, line,
	    function ? ", function \"" : "",
	    function ? function : "",
	    function ? "\"" : "");
}

void
__assert13(const char *file, int line, const char *function,
    const char *failedexpr)
{
	char buf[1024];
	int l = fmtassert(buf, sizeof(buf), file, line, function, failedexpr);
	if (l < 0)
		abort();
	(void)write(STDERR_FILENO, buf, (size_t)l);
	abort();
	/* NOTREACHED */
}

void
__assert(const char *file, int line, const char *failedexpr)
{

	__assert13(file, line, NULL, failedexpr);
	/* NOTREACHED */
}


enum {
	DIAGASSERT_ABORT =	1<<0,
	DIAGASSERT_STDERR =	1<<1,
	DIAGASSERT_SYSLOG =	1<<2
};

static int	diagassert_flags = -1;

void
__diagassert13(const char *file, int line, const char *function,
    const char *failedexpr)
{
	char buf[1024];

	if (diagassert_flags == -1) {
		char *p;

		diagassert_flags = DIAGASSERT_SYSLOG;

		for (p = getenv("LIBC_DIAGASSERT"); p && *p; p++) {
			switch (*p) {
			case 'a':
				diagassert_flags |= DIAGASSERT_ABORT;
				break;
			case 'A':
				diagassert_flags &= ~DIAGASSERT_ABORT;
				break;
			case 'e':
				diagassert_flags |= DIAGASSERT_STDERR;
				break;
			case 'E':
				diagassert_flags &= ~DIAGASSERT_STDERR;
				break;
			case 'l':
				diagassert_flags |= DIAGASSERT_SYSLOG;
				break;
			case 'L':
				diagassert_flags &= ~DIAGASSERT_SYSLOG;
				break;
			}
		}
	}

	fmtassert(buf, sizeof(buf), file, line, function, failedexpr);
	if (diagassert_flags & DIAGASSERT_STDERR) {
		char ebuf[1024];
		int l = snprintf_ss(ebuf, sizeof(ebuf), "%s: %s\n",
		    getprogname(), buf);
		if (l == -1)
			abort();
		(void)write(STDERR_FILENO, ebuf, (size_t)l);
	}
	if (diagassert_flags & DIAGASSERT_SYSLOG) {
		struct syslog_data sdata = SYSLOG_DATA_INIT;
		syslog_ss(LOG_DEBUG | LOG_USER, &sdata, "%s", buf);
	}
	if (diagassert_flags & DIAGASSERT_ABORT)
		abort();
}

void
__diagassert(const char *file, int line, const char *failedexpr)
{

	__diagassert13(file, line, NULL, failedexpr);
}