1 files changed, 64 insertions, 0 deletions

diff --git a/include/linux/nls.h b/include/linux/nls.h
new file mode 100644
index 000000000000..816c04ad7381
--- /dev/null
+++ b/include/linux/nls.h
@@ -0,0 +1,64 @@
+#ifndef _LINUX_NLS_H
+#define _LINUX_NLS_H
+
+#include <linux/init.h>
+
+/* unicode character */
+typedef __u16 wchar_t;
+
+struct nls_table {
+        char *charset;
+        char *alias;
+        int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen);
+        int (*char2uni) (const unsigned char *rawstring, int boundlen,
+                         wchar_t *uni);
+        unsigned char *charset2lower;
+        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;
+}
+
+#define MODULE_ALIAS_NLS(name)  MODULE_ALIAS("nls_" __stringify(name))
+
+#endif /* _LINUX_NLS_H */
+