fs/nls/nls_utf8.c

   1 /*
   2  * Module for handling utf8 just like any other charset.
   3  * By Urban Widmark 2000
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/kernel.h>
   8 #include <linux/string.h>
   9 #include <linux/nls.h>
  10 #include <linux/errno.h>
  11
  12 static unsigned char identity[256];
  13
  14 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
  15 {
  16         int n;
  17
  18         if ( (n = utf8_wctomb(out, uni, boundlen)) == -1) {
  19                 *out = '?';
  20                 return -EINVAL;
  21         }
  22         return n;
  23 }
  24
  25 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
  26 {
  27         int n;
  28
  29         if ( (n = utf8_mbtowc(uni, rawstring, boundlen)) == -1) {
  30                 *uni = 0x003f;  /* ? */
  31                 n = -EINVAL;
  32         }
  33         return n;
  34 }
  35
  36 static struct nls_table table = {
  37         .charset        = "utf8",
  38         .uni2char       = uni2char,
  39         .char2uni       = char2uni,
  40         .charset2lower  = identity,     /* no conversion */
  41         .charset2upper  = identity,
  42         .owner          = THIS_MODULE,
  43 };
  44
  45 static int __init init_nls_utf8(void)
  46 {
  47         int i;
  48         for (i=0; i<256; i++)
  49                 identity[i] = i;
  50
  51         return register_nls(&table);
  52 }
  53
  54 static void __exit exit_nls_utf8(void)
  55 {
  56         unregister_nls(&table);
  57 }
  58
  59 module_init(init_nls_utf8)
  60 module_exit(exit_nls_utf8)
  61 MODULE_LICENSE("Dual BSD/GPL");