Linux kernel mirror (for testing)
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linux
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 const char *charset;
11 const 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 const unsigned char *charset2lower;
16 const 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/*
62 * nls_nullsize - return length of null character for codepage
63 * @codepage - codepage for which to return length of NULL terminator
64 *
65 * Since we can't guarantee that the null terminator will be a particular
66 * length, we have to check against the codepage. If there's a problem
67 * determining it, assume a single-byte NULL terminator.
68 */
69static inline int
70nls_nullsize(const struct nls_table *codepage)
71{
72 int charlen;
73 char tmp[NLS_MAX_CHARSET_SIZE];
74
75 charlen = codepage->uni2char(0, tmp, NLS_MAX_CHARSET_SIZE);
76
77 return charlen > 0 ? charlen : 1;
78}
79
80#define MODULE_ALIAS_NLS(name) MODULE_ALIAS("nls_" __stringify(name))
81
82#endif /* _LINUX_NLS_H */
83