/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *   Copyright (C) International Business Machines Corp., 2000-2002
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 */
#ifndef _H_JFS_UNICODE
#define _H_JFS_UNICODE

#include <linux/slab.h>
#include <asm/byteorder.h>
#include "../nls/nls_ucs2_data.h"
#include "jfs_types.h"

extern int get_UCSname(struct component_name *, struct dentry *);
extern int jfs_strfromUCS_le(char *, const __le16 *, int, struct nls_table *);

#define free_UCSname(COMP) kfree((COMP)->name)

/*
 * UniStrcpy:  Copy a string
 */
static inline wchar_t *UniStrcpy(wchar_t * ucs1, const wchar_t * ucs2)
{
        wchar_t *anchor = ucs1; /* save the start of result string */

        while ((*ucs1++ = *ucs2++));
        return anchor;
}



/*
 * UniStrncpy:  Copy length limited string with pad
 */
static inline __le16 *UniStrncpy_le(__le16 * ucs1, const __le16 * ucs2,
                                  size_t n)
{
        __le16 *anchor = ucs1;

        while (n-- && *ucs2)    /* Copy the strings */
                *ucs1++ = *ucs2++;

        n++;
        while (n--)             /* Pad with nulls */
                *ucs1++ = 0;
        return anchor;
}

/*
 * UniStrncmp_le:  Compare length limited string - native to little-endian
 */
static inline int UniStrncmp_le(const wchar_t * ucs1, const __le16 * ucs2,
                                size_t n)
{
        if (!n)
                return 0;       /* Null strings are equal */
        while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
                ucs1++;
                ucs2++;
        }
        return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
}

/*
 * UniStrncpy_to_le:  Copy length limited string with pad to little-endian
 */
static inline __le16 *UniStrncpy_to_le(__le16 * ucs1, const wchar_t * ucs2,
                                       size_t n)
{
        __le16 *anchor = ucs1;

        while (n-- && *ucs2)    /* Copy the strings */
                *ucs1++ = cpu_to_le16(*ucs2++);

        n++;
        while (n--)             /* Pad with nulls */
                *ucs1++ = 0;
        return anchor;
}

/*
 * UniStrncpy_from_le:  Copy length limited string with pad from little-endian
 */
static inline wchar_t *UniStrncpy_from_le(wchar_t * ucs1, const __le16 * ucs2,
                                          size_t n)
{
        wchar_t *anchor = ucs1;

        while (n-- && *ucs2)    /* Copy the strings */
                *ucs1++ = __le16_to_cpu(*ucs2++);

        n++;
        while (n--)             /* Pad with nulls */
                *ucs1++ = 0;
        return anchor;
}

/*
 * UniToupper:  Convert a unicode character to upper case
 */
static inline wchar_t UniToupper(wchar_t uc)
{
        const struct UniCaseRange *rp;

        if (uc < sizeof(NlsUniUpperTable)) {    /* Latin characters */
                return uc + NlsUniUpperTable[uc];       /* Use base tables */
        } else {
                rp = NlsUniUpperRange;  /* Use range tables */
                while (rp->start) {
                        if (uc < rp->start)     /* Before start of range */
                                return uc;      /* Uppercase = input */
                        if (uc <= rp->end)      /* In range */
                                return uc + rp->table[uc - rp->start];
                        rp++;   /* Try next range */
                }
        }
        return uc;              /* Past last range */
}


/*
 * UniStrupr:  Upper case a unicode string
 */
static inline wchar_t *UniStrupr(wchar_t * upin)
{
        wchar_t *up;

        up = upin;
        while (*up) {           /* For all characters */
                *up = UniToupper(*up);
                up++;
        }
        return upin;            /* Return input pointer */
}

#endif                          /* !_H_JFS_UNICODE */