LXR linux/include/linux/nls.h

   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#define MODULE_ALIAS_NLS(name)  MODULE_ALIAS("nls_" __stringify(name))
  62
  63#endif /* _LINUX_NLS_H */
  64
  65