Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / nls / nls_koi8-ru.c

diff --git a/kernel/fs/nls/nls_koi8-ru.c b/kernel/fs/nls/nls_koi8-ru.c
new file mode 100644 (file)
index 0000000..a80a741
--- /dev/null
+++ b/kernel/fs/nls/nls_koi8-ru.c
@@ -0,0 +1,82 @@
+/*
+ * linux/fs/nls/nls_koi8-ru.c
+ *
+ * Charset koi8-ru translation based on charset koi8-u.
+ * The Unicode to charset table has only exact mappings.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/nls.h>
+#include <linux/errno.h>
+
+static struct nls_table *p_nls;
+
+static int uni2char(const wchar_t uni,
+                   unsigned char *out, int boundlen)
+{
+       if (boundlen <= 0)
+               return -ENAMETOOLONG;
+
+       if ((uni & 0xffaf) == 0x040e || (uni & 0xffce) == 0x254c) {
+               /* koi8-ru and koi8-u differ only on two characters */
+               if (uni == 0x040e)
+                       out[0] = 0xbe;
+               else if (uni == 0x045e)
+                       out[0] = 0xae;
+               else if (uni == 0x255d || uni == 0x256c)
+                       return 0;
+               else
+                       return p_nls->uni2char(uni, out, boundlen);
+               return 1;
+       }
+       else
+               /* fast path */
+               return p_nls->uni2char(uni, out, boundlen);
+}
+
+static int char2uni(const unsigned char *rawstring, int boundlen,
+                   wchar_t *uni)
+{
+       int n;
+
+       if ((*rawstring & 0xef) != 0xae) {
+               /* koi8-ru and koi8-u differ only on two characters */
+               *uni = (*rawstring & 0x10) ? 0x040e : 0x045e;
+               return 1;
+       }
+
+       n = p_nls->char2uni(rawstring, boundlen, uni);
+       return n;
+}
+
+static struct nls_table table = {
+       .charset        = "koi8-ru",
+       .uni2char       = uni2char,
+       .char2uni       = char2uni,
+};
+
+static int __init init_nls_koi8_ru(void)
+{
+       p_nls = load_nls("koi8-u");
+
+       if (p_nls) {
+               table.charset2upper = p_nls->charset2upper;
+               table.charset2lower = p_nls->charset2lower;
+               return register_nls(&table);
+       }
+
+       return -EINVAL;
+}
+
+static void __exit exit_nls_koi8_ru(void)
+{
+       unregister_nls(&table);
+       unload_nls(p_nls);
+}
+
+module_init(init_nls_koi8_ru)
+module_exit(exit_nls_koi8_ru)
+
+MODULE_LICENSE("Dual BSD/GPL");