LXR linux/fs/nls/nls

   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
  12static unsigned char identity[256];
  13
  14static 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
  25static 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
  36static 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
  45static 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
  54static void __exit exit_nls_utf8(void)
  55{
  56        unregister_nls(&table);
  57}
  58
  59module_init(init_nls_utf8)
  60module_exit(exit_nls_utf8)
  61MODULE_LICENSE("Dual BSD/GPL");
  62