Kernel utf-8 handling

This patch fixes dead keys and copy/paste of non-ASCII characters in UTF-8
mode on Linux console.  See more details about the original patch at:
http://chris.heathens.co.nz/linux/utf8.html

Already posted on
	(Oldest) http://lkml.org/lkml/2003/5/31/148
	         http://lkml.org/lkml/2005/12/24/69
	(Recent) http://lkml.org/lkml/2006/8/7/75

[bunk@stusta.de: make drivers/char/selection.c:store_utf8() static]
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Cc: Alexander E. Patrakov <patrakov@ums.usu.ru>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 8 deletions

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 90965b4def5c..2ce0af1bd588 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -24,6 +24,7 @@
  * 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
  */
 
+#include <linux/consolemap.h>
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/tty.h>
@@ -308,10 +309,9 @@ static void applkey(struct vc_data *vc, int key, char mode)
  * Many other routines do put_queue, but I think either
  * they produce ASCII, or they produce some user-assigned
  * string, and in both cases we might assume that it is
- * in utf-8 already. UTF-8 is defined for words of up to 31 bits,
- * but we need only 16 bits here
+ * in utf-8 already.
  */
-static void to_utf8(struct vc_data *vc, ushort c)
+static void to_utf8(struct vc_data *vc, uint c)
 {
         if (c < 0x80)
                 /*  0******* */
@@ -320,11 +320,21 @@ static void to_utf8(struct vc_data *vc, ushort c)
                 /* 110***** 10****** */
                 put_queue(vc, 0xc0 | (c >> 6));
                 put_queue(vc, 0x80 | (c & 0x3f));
-        } else {
+        } else if (c < 0x10000) {
+                if (c >= 0xD800 && c < 0xE000)
+                        return;
+                if (c == 0xFFFF)
+                        return;
                 /* 1110**** 10****** 10****** */
                 put_queue(vc, 0xe0 | (c >> 12));
                 put_queue(vc, 0x80 | ((c >> 6) & 0x3f));
                 put_queue(vc, 0x80 | (c & 0x3f));
+        } else if (c < 0x110000) {
+                /* 11110*** 10****** 10****** 10****** */
+                put_queue(vc, 0xf0 | (c >> 18));
+                put_queue(vc, 0x80 | ((c >> 12) & 0x3f));
+                put_queue(vc, 0x80 | ((c >> 6) & 0x3f));
+                put_queue(vc, 0x80 | (c & 0x3f));
         }
 }
 
@@ -393,7 +403,7 @@ static unsigned int handle_diacr(struct vc_data *vc, unsigned int ch)
                 return d;
 
         if (kbd->kbdmode == VC_UNICODE)
-                to_utf8(vc, d);
+                to_utf8(vc, conv_8bit_to_uni(d));
         else if (d < 0x100)
                 put_queue(vc, d);
 
@@ -407,7 +417,7 @@ static void fn_enter(struct vc_data *vc)
 {
         if (diacr) {
                 if (kbd->kbdmode == VC_UNICODE)
-                        to_utf8(vc, diacr);
+                        to_utf8(vc, conv_8bit_to_uni(diacr));
                 else if (diacr < 0x100)
                         put_queue(vc, diacr);
                 diacr = 0;
@@ -617,7 +627,7 @@ static void k_unicode(struct vc_data *vc, unsigned int value, char up_flag)
                 return;
         }
         if (kbd->kbdmode == VC_UNICODE)
-                to_utf8(vc, value);
+                to_utf8(vc, conv_8bit_to_uni(value));
         else if (value < 0x100)
                 put_queue(vc, value);
 }
@@ -775,7 +785,7 @@ static void k_shift(struct vc_data *vc, unsigned char value, char up_flag)
         /* kludge */
         if (up_flag && shift_state != old_state && npadch != -1) {
                 if (kbd->kbdmode == VC_UNICODE)
-                        to_utf8(vc, npadch & 0xffff);
+                        to_utf8(vc, npadch);
                 else
                         put_queue(vc, npadch & 0xff);
                 npadch = -1;