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-rw-r--r--fs/nls/nls_utf8.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/fs/nls/nls_utf8.c b/fs/nls/nls_utf8.c
new file mode 100644
index 000000000..afcfbc4a1
--- /dev/null
+++ b/fs/nls/nls_utf8.c
@@ -0,0 +1,67 @@
+/*
+ * 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 (boundlen <= 0)
+ return -ENAMETOOLONG;
+
+ n = utf32_to_utf8(uni, out, boundlen);
+ if (n < 0) {
+ *out = '?';
+ return -EINVAL;
+ }
+ return n;
+}
+
+static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
+{
+ int n;
+ unicode_t u;
+
+ n = utf8_to_utf32(rawstring, boundlen, &u);
+ if (n < 0 || u > MAX_WCHAR_T) {
+ *uni = 0x003f; /* ? */
+ return -EINVAL;
+ }
+ *uni = (wchar_t) u;
+ return n;
+}
+
+static struct nls_table table = {
+ .charset = "utf8",
+ .uni2char = uni2char,
+ .char2uni = char2uni,
+ .charset2lower = identity, /* no conversion */
+ .charset2upper = identity,
+};
+
+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");