/*	$NetBSD: swabcheck.c,v 1.2 2008/04/28 20:23:05 martin Exp $	*/

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code was contributed to The NetBSD Foundation by Christos Zoulas.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <err.h>

#define MAXCHK	100

static void
build(char *a, char *b, size_t n) {
	size_t i;

	n >>= 1;
	for (i = 0; i < n; i += 2) {
		b[i+1] = a[i] = (char)i;
		b[i] = a[i+1] = (char)(i+1);
	}
	for (n <<= 1; n < MAXCHK; n++)
		a[n] = b[n] = (char)~0;
		
}

static void
dump(f, b, l)
	const char *f;
	char *b;
	size_t l;
{
	printf("%s ", f);
	while (l--)
		printf("%.2x ", (unsigned char)*b++);
	printf("\n");
}

int
main(int argc, char *argv[])
{
	char a[MAXCHK], b[MAXCHK], r[MAXCHK];
	size_t i;

	for (i = 0; i < MAXCHK; i += 2) {
		build(a, b, i);
		(void)memset(r, ~0, MAXCHK);
		swab(a, r, i);
		if (memcmp(b, r, MAXCHK) != 0) {
			warnx("pattern mismatch at %lu bytes",
			    (unsigned long)i);
			dump("expect:", b, MAXCHK);
			dump("result:", r, MAXCHK);
			return 1;
		}
	}
	return 0;
}