/*
   * Module for handling utf8 just like any other charset.
   * By Urban Widmark 2000
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/string.h>
  #include <linux/nls.h>
  #include <linux/errno.h>
  
  static unsigned char identity[256];
  
  static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
  {
  	int n;

  	if (boundlen <= 0)
  		return -ENAMETOOLONG;
  
  	n = utf32_to_utf8(uni, out, boundlen);
  	if (n < 0) {

  		*out = '?';
  		return -EINVAL;
  	}
  	return n;
  }
  
  static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
  {
  	int n;

  	unicode_t u;

  	n = utf8_to_utf32(rawstring, boundlen, &u);
  	if (n < 0 || u > MAX_WCHAR_T) {

  		*uni = 0x003f;	/* ? */

  		return -EINVAL;

  	}

  	*uni = (wchar_t) u;

  	return n;
  }
  
  static struct nls_table table = {
  	.charset	= "utf8",
  	.uni2char	= uni2char,
  	.char2uni	= char2uni,
  	.charset2lower	= identity,	/* no conversion */
  	.charset2upper	= identity,
  	.owner		= THIS_MODULE,
  };
  
  static int __init init_nls_utf8(void)
  {
  	int i;
  	for (i=0; i<256; i++)
  		identity[i] = i;
  
          return register_nls(&table);
  }
  
  static void __exit exit_nls_utf8(void)
  {
          unregister_nls(&table);
  }
  
  module_init(init_nls_utf8)
  module_exit(exit_nls_utf8)
  MODULE_LICENSE("Dual BSD/GPL");