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Clean up the NTFS debug code - use uppercase names for the debug macros,
especially since 'dprintf' now has another meaning (at least outside of
the kernel). Tweak the macro syntax so we can avoid having to double
bracket all invocations. Also apply a good dose of style(9).

ok krw@

/*	$OpenBSD: ntfs_conv.c,v 1.9 2013/11/24 16:02:30 jsing Exp $	*/
/*	$NetBSD: ntfs_conv.c,v 1.1 2002/12/23 17:38:32 jdolecek Exp $	*/

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * 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.
 *
 * 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.
 */

/*
 * File name recode stuff.
 *
 * The utf-8 routines were derived from src/lib/libc/locale/utf2.c.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/mount.h>

/* #define NTFS_DEBUG 1 */
#include <ntfs/ntfs.h>
#include <ntfs/ntfs_inode.h>
#include <ntfs/ntfs_subr.h>

/* UTF-8 encoding stuff */

static const int _utf_count[16] = {
        1, 1, 1, 1, 1, 1, 1, 1,
        0, 0, 0, 0, 2, 2, 3, 0,
};

/*
 * Read one wide character off the string, shift the string pointer
 * and return the character.
 */
wchar
ntfs_utf8_wget(const char **str)
{
	int c;
	wchar rune = 0;
	const char *s = *str;

	c = _utf_count[(s[0] >> 4) & 0xf];
	if (c == 0) {
		c = 1;
		goto encoding_error;
	}

	switch (c) {
	case 1:
		rune = s[0] & 0xff;
		break;
	case 2:
		if ((s[1] & 0xc0) != 0x80)
			goto encoding_error;
		rune = ((s[0] & 0x1F) << 6) | (s[1] & 0x3F);
		break;
	case 3:
		if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
			goto encoding_error;
		rune = ((s[0] & 0x1F) << 12) | ((s[1] & 0x3F) << 6) |
		    (s[2] & 0x3F);
		break;
	}

encoding_error:
	*str = *str + c;
	return rune;
}

/*
 * Encode wide character and write it to the string. 'n' specifies
 * how much space there is in the string. Returns number of bytes written
 * to the target string.
 */
int
ntfs_utf8_wput(char *s, size_t n, wchar wc)
{
        if (wc & 0xf800) {
                if (n < 3) {
                        /* bound check failure */
			DDPRINTF("ntfs_utf8_wput: need 3 bytes\n");
                        return 0;
                }

                s[0] = 0xE0 | ((wc >> 12) & 0x0F);
                s[1] = 0x80 | ((wc >> 6) & 0x3F);
                s[2] = 0x80 | ((wc) & 0x3F);
                return 3;
        } else {
                if (wc & 0x0780) {
                        if (n < 2) {
                                /* bound check failure */
				DDPRINTF("ntfs_utf8_wput: need 2 bytes\n");
                                return 0;
                        }

                        s[0] = 0xC0 | ((wc >> 6) & 0x1F);
                        s[1] = 0x80 | ((wc) & 0x3F);
                        return 2;
                } else {
                        if (n < 1) {
                                /* bound check failure */
				DDPRINTF("ntfs_utf8_wput: need 1 byte\n");
                                return 0;
                        }

                        s[0] = wc;
                        return 1;
                }
        }
}

/*
 * Compare two wide characters, returning 1, 0, -1 if the first is
 * bigger, equal or lower than the second.
 */
int
ntfs_utf8_wcmp(wchar wc1, wchar wc2)
{
	/* no conversions needed for utf8 */

	if (wc1 == wc2)
		return 0;
	else
		return (int) wc1 - (int) wc2; 
}