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#ifndef _LINUX_NLS_H
#define _LINUX_NLS_H
#include <linux/init.h>
/* unicode character */
typedef __u16 wchar_t;
struct nls_table {
const char *charset;
const char *alias;
int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen);
int (*char2uni) (const unsigned char *rawstring, int boundlen,
wchar_t *uni);
const unsigned char *charset2lower;
const unsigned char *charset2upper;
struct module *owner;
struct nls_table *next;
};
/* this value hold the maximum octet of charset */
#define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */
/* nls.c */
extern int register_nls(struct nls_table *);
extern int unregister_nls(struct nls_table *);
extern struct nls_table *load_nls(char *);
extern void unload_nls(struct nls_table *);
extern struct nls_table *load_nls_default(void);
extern int utf8_mbtowc(wchar_t *, const __u8 *, int);
extern int utf8_mbstowcs(wchar_t *, const __u8 *, int);
extern int utf8_wctomb(__u8 *, wchar_t, int);
extern int utf8_wcstombs(__u8 *, const wchar_t *, int);
static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c)
{
unsigned char nc = t->charset2lower[c];
return nc ? nc : c;
}
static inline unsigned char nls_toupper(struct nls_table *t, unsigned char c)
{
unsigned char nc = t->charset2upper[c];
return nc ? nc : c;
}
static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1,
const unsigned char *s2, int len)
{
while (len--) {
if (nls_tolower(t, *s1++) != nls_tolower(t, *s2++))
return 1;
}
return 0;
}
/*
* nls_nullsize - return length of null character for codepage
* @codepage - codepage for which to return length of NULL terminator
*
* Since we can't guarantee that the null terminator will be a particular
* length, we have to check against the codepage. If there's a problem
* determining it, assume a single-byte NULL terminator.
*/
static inline int
nls_nullsize(const struct nls_table *codepage)
{
int charlen;
char tmp[NLS_MAX_CHARSET_SIZE];
charlen = codepage->uni2char(0, tmp, NLS_MAX_CHARSET_SIZE);
return charlen > 0 ? charlen : 1;
}
#define MODULE_ALIAS_NLS(name) MODULE_ALIAS("nls_" __stringify(name))
#endif /* _LINUX_NLS_H */
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