1#ifndef _LINUX_NLS_H
2#define _LINUX_NLS_H
3
4#include <linux/init.h>
5
6/* unicode character */
7typedef __u16 wchar_t;
8
9struct nls_table {
10	char *charset;
11	char *alias;
12	int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen);
13	int (*char2uni) (const unsigned char *rawstring, int boundlen,
14			 wchar_t *uni);
15	unsigned char *charset2lower;
16	unsigned char *charset2upper;
17	struct module *owner;
18	struct nls_table *next;
19};
20
21/* this value hold the maximum octet of charset */
22#define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */
23
24/* nls.c */
25extern int register_nls(struct nls_table *);
26extern int unregister_nls(struct nls_table *);
27extern struct nls_table *load_nls(char *);
28extern void unload_nls(struct nls_table *);
29extern struct nls_table *load_nls_default(void);
30
31extern int utf8_mbtowc(wchar_t *, const __u8 *, int);
32extern int utf8_mbstowcs(wchar_t *, const __u8 *, int);
33extern int utf8_wctomb(__u8 *, wchar_t, int);
34extern int utf8_wcstombs(__u8 *, const wchar_t *, int);
35
36static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c)
37{
38	unsigned char nc = t->charset2lower[c];
39
40	return nc ? nc : c;
41}
42
43static inline unsigned char nls_toupper(struct nls_table *t, unsigned char c)
44{
45	unsigned char nc = t->charset2upper[c];
46
47	return nc ? nc : c;
48}
49
50static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1,
51		const unsigned char *s2, int len)
52{
53	while (len--) {
54		if (nls_tolower(t, *s1++) != nls_tolower(t, *s2++))
55			return 1;
56	}
57
58	return 0;
59}
60
61#define MODULE_ALIAS_NLS(name)	MODULE_ALIAS("nls_" __stringify(name))
62
63#endif /* _LINUX_NLS_H */
64