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#ifndef _LINUX_NLS_H

#define _LINUX_NLS_H

#include <linux/init.h>

/* unicode character */

typedef __u16 wchar_t;

struct nls_table {

        const char *charset;

        const char *alias;

        int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen);

        int (*char2uni) (const unsigned char *rawstring, int boundlen,

                         wchar_t *uni);

        const unsigned char *charset2lower;

        const unsigned char *charset2upper;

        struct module *owner;

        struct nls_table *next;

};

/* this value hold the maximum octet of charset */

#define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */

/* nls.c */

extern int register_nls(struct nls_table *);

extern int unregister_nls(struct nls_table *);

extern struct nls_table *load_nls(char *);

extern void unload_nls(struct nls_table *);

extern struct nls_table *load_nls_default(void);

extern int utf8_mbtowc(wchar_t *, const __u8 *, int);

extern int utf8_mbstowcs(wchar_t *, const __u8 *, int);

extern int utf8_wctomb(__u8 *, wchar_t, int);

extern int utf8_wcstombs(__u8 *, const wchar_t *, int);

static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c)

{

        unsigned char nc = t->charset2lower[c];

        return nc ? nc : c;

}

static inline unsigned char nls_toupper(struct nls_table *t, unsigned char c)

{

        unsigned char nc = t->charset2upper[c];

        return nc ? nc : c;

}

static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1,

                const unsigned char *s2, int len)

{

        while (len--) {

                if (nls_tolower(t, *s1++) != nls_tolower(t, *s2++))

                        return 1;

        }

        return 0;

}

#define MODULE_ALIAS_NLS(name)  MODULE_ALIAS("nls_" __stringify(name))

#endif /* _LINUX_NLS_H */