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/*

 * linux/fs/nls_koi8-ru.c

 *

 * Charset koi8-ru translation based on charset koi8-u.

 * The Unicode to charset table has only exact mappings.

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/nls.h>

#include <linux/errno.h>

static struct nls_table *p_nls;

static int uni2char(const wchar_t uni,

                    unsigned char *out, int boundlen)

{

        if (boundlen <= 0)

                return -ENAMETOOLONG;

        if ((uni & 0xffaf) == 0x040e || (uni & 0xffce) == 0x254c) {

                /* koi8-ru and koi8-u differ only on two characters */

                if (uni == 0x040e)

                        out[0] = 0xbe;

                else if (uni == 0x045e)

                        out[0] = 0xae;

                else if (uni == 0x255d || uni == 0x256c)

                        return 0;

                else

                        return p_nls->uni2char(uni, out, boundlen);

                return 1;

        }

        else

                /* fast path */

                return p_nls->uni2char(uni, out, boundlen);

}

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

                    wchar_t *uni)

{

        int n;

        if ((*rawstring & 0xef) != 0xae) {

                /* koi8-ru and koi8-u differ only on two characters */

                *uni = (*rawstring & 0x10) ? 0x040e : 0x045e;

                return 1;

        }

        n = p_nls->char2uni(rawstring, boundlen, uni);

        return n;

}

static struct nls_table table = {

        "koi8-ru",

        uni2char,

        char2uni,

        NULL,

        NULL,

        THIS_MODULE,

};

static int __init init_nls_koi8_ru(void)

{

        p_nls = load_nls("koi8-u");

        if (p_nls) {

                table.charset2upper = p_nls->charset2upper;

                table.charset2lower = p_nls->charset2lower;

                return register_nls(&table);

        }

        return -EINVAL;

}

static void __exit exit_nls_koi8_ru(void)

{

        unregister_nls(&table);

        unload_nls(p_nls);

}

module_init(init_nls_koi8_ru)

module_exit(exit_nls_koi8_ru)

MODULE_LICENSE("Dual BSD/GPL");

/*

 * Overrides for Emacs so that we follow Linus's tabbing style.

 * Emacs will notice this stuff at the end of the file and automatically

 * adjust the settings for this buffer only.  This must remain at the end

 * of the file.

 * ---------------------------------------------------------------------------

 * Local variables:

 * c-indent-level: 8

 * c-brace-imaginary-offset: 0

 * c-brace-offset: -8

 * c-argdecl-indent: 8

 * c-label-offset: -8

 * c-continued-statement-offset: 8

 * c-continued-brace-offset: 0

 * End:

 */