1 #ifndef _LINUX_NLS_H
2 #define _LINUX_NLS_H
3
4 #include <linux/init.h>
5
6 /* unicode character */
7 typedef __u16 wchar_t;
8
9 struct 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 */
25 extern int register_nls(struct nls_table *);
26 extern int unregister_nls(struct nls_table *);
27 extern struct nls_table *load_nls(char *);
28 extern void unload_nls(struct nls_table *);
29 extern struct nls_table *load_nls_default(void);
30
31 extern int utf8_mbtowc(wchar_t *, const __u8 *, int);
32 extern int utf8_mbstowcs(wchar_t *, const __u8 *, int);
33 extern int utf8_wctomb(__u8 *, wchar_t, int);
34 extern int utf8_wcstombs(__u8 *, const wchar_t *, int);
35
36 static 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
43 static 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
50 static 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
65
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