1 files changed, 61 insertions, 0 deletions

diff --git a/fs/nls/nls_utf8.c b/fs/nls/nls_utf8.c
new file mode 100644
index 000000000000..aa2c42fdd977
--- /dev/null
+++ b/fs/nls/nls_utf8.c
@@ -0,0 +1,61 @@
+/*
+ * Module for handling utf8 just like any other charset.
+ * By Urban Widmark 2000
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/nls.h>
+#include <linux/errno.h>
+
+static unsigned char identity[256];
+
+static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
+{
+        int n;
+
+        if ( (n = utf8_wctomb(out, uni, boundlen)) == -1) {
+                *out = '?';
+                return -EINVAL;
+        }
+        return n;
+}
+
+static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
+{
+        int n;
+
+        if ( (n = utf8_mbtowc(uni, rawstring, boundlen)) == -1) {
+                *uni = 0x003f;  /* ? */
+                n = -EINVAL;
+        }
+        return n;
+}
+
+static struct nls_table table = {
+        .charset        = "utf8",
+        .uni2char       = uni2char,
+        .char2uni       = char2uni,
+        .charset2lower  = identity,     /* no conversion */
+        .charset2upper  = identity,
+        .owner          = THIS_MODULE,
+};
+
+static int __init init_nls_utf8(void)
+{
+        int i;
+        for (i=0; i<256; i++)
+                identity[i] = i;
+
+        return register_nls(&table);
+}
+
+static void __exit exit_nls_utf8(void)
+{
+        unregister_nls(&table);
+}
+
+module_init(init_nls_utf8)
+module_exit(exit_nls_utf8)
+MODULE_LICENSE("Dual BSD/GPL");