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 (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
29 static 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
43 static struct nls_table table = {
44 .charset = "utf8",
45 .uni2char = uni2char,
46 .char2uni = char2uni,
47 .charset2lower = identity, /* no conversion */
48 .charset2upper = identity,
49 };
50
51 static 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
60 static void __exit exit_nls_utf8(void)
61 {
62 unregister_nls(&table);
63 }
64
65 module_init(init_nls_utf8)
66 module_exit(exit_nls_utf8)
67 MODULE_DESCRIPTION("NLS UTF-8");
68 MODULE_LICENSE("Dual BSD/GPL");
69
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