linux/fs/nls/nls_utf8.c
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   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 (boundlen <= 0)
  19                return -ENAMETOOLONG;
  20
  21        n = utf32_to_utf8(uni, out, boundlen);
  22        if (n < 0) {
  23                *out = '?';
  24                return -EINVAL;
  25        }
  26        return n;
  27}
  28
  29static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
  30{
  31        int n;
  32        unicode_t u;
  33
  34        n = utf8_to_utf32(rawstring, boundlen, &u);
  35        if (n < 0 || u > MAX_WCHAR_T) {
  36                *uni = 0x003f;  /* ? */
  37                return -EINVAL;
  38        }
  39        *uni = (wchar_t) u;
  40        return n;
  41}
  42
  43static struct nls_table table = {
  44        .charset        = "utf8",
  45        .uni2char       = uni2char,
  46        .char2uni       = char2uni,
  47        .charset2lower  = identity,     /* no conversion */
  48        .charset2upper  = identity,
  49        .owner          = THIS_MODULE,
  50};
  51
  52static int __init init_nls_utf8(void)
  53{
  54        int i;
  55        for (i=0; i<256; i++)
  56                identity[i] = i;
  57
  58        return register_nls(&table);
  59}
  60
  61static void __exit exit_nls_utf8(void)
  62{
  63        unregister_nls(&table);
  64}
  65
  66module_init(init_nls_utf8)
  67module_exit(exit_nls_utf8)
  68MODULE_LICENSE("Dual BSD/GPL");
  69
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