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 "utf8",
38 uni2char,
39 char2uni,
40 identity, /* no conversion */
41 identity,
42 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
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