nls.h

嵌入式FAT文件系统

#ifndef NLS_H
#define NLS_H	
/* unicode character */

struct nls_table {
	char *charset;
	char *alias;
	int (*uni2char) (unsigned short uni, unsigned char *out, int boundlen);
	int (*char2uni) (const unsigned char *rawstring, int boundlen,
			unsigned short *uni);
	unsigned char *charset2lower;
	unsigned char *charset2upper;
	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 struct nls_table *load_nls_utf8(void);
extern void unload_nls_utf8(void);
extern int utf8_mbtowc(unsigned short *, const unsigned char *, int);
extern int utf8_mbstowcs(unsigned short *, const unsigned char *, int);
extern int utf8_wctomb(unsigned char *, unsigned short, int);
extern int utf8_wcstombs(unsigned char *, const unsigned short *, 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;
}



#endif