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};
50
51static int __init init_nls_utf8(void)
52{
53	int i;
54	for (i=0; i<256; i++)
55		identity[i] = i;
56
57        return register_nls(&table);
58}
59
60static void __exit exit_nls_utf8(void)
61{
62        unregister_nls(&table);
63}
64
65module_init(init_nls_utf8)
66module_exit(exit_nls_utf8)
67MODULE_LICENSE("Dual BSD/GPL");
68