jfs_unicode.h

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/*
 *   Copyright (C) International Business Machines Corp., 2000-2002
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef _H_JFS_UNICODE
#define _H_JFS_UNICODE

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

typedef struct {
    wchar_t start;
    wchar_t end;
    signed char *table;
} UNICASERANGE;

extern signed char UniUpperTable[512];
extern UNICASERANGE UniUpperRange[];
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)
{
    UNICASERANGE *rp;

    if (uc < sizeof(UniUpperTable)) {   /* Latin characters */
        return uc + UniUpperTable[uc];  /* Use base tables */
    } else {
        rp = UniUpperRange; /* 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 */