unicode diacritics support

There have been issues with non-latin1 diacritics and unicode.
http://bugzilla.kernel.org/show_bug.cgi?id=7746

Git 759448f459234bfcf34b82471f0dba77a9aca498 `Kernel utf-8 handling'
partly resolved it by adding conversion between diacritics and
unicode. The patch below goes further by just turning diacritics into
unicode, hence providing better future support. The kbd support can be
fetched from
http://bugzilla.kernel.org/attachment.cgi?id=12313

This was tested in all of latin1, latin9, latin2 and unicode with french
and czech dead keys.

Turn the kernel accent_table into unicode, and extend ioctls KDGKBDIACR
and KDSKBDIACR into their equivalents KDGKBDIACRUC and KDSKBDIACR.

New function int conv_uni_to_8bit(u32 uni) for converting unicode into 8bit
_input_.  No, we don't want to store the translation, as it is potentially
sparse and large.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: Jan Engelhardt <jengelh@gmx.de>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 25 insertions, 10 deletions

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index d95f316afb5a..5ae2a3250c50 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -38,6 +38,7 @@
 #include <linux/kbd_kern.h>
 #include <linux/kbd_diacr.h>
 #include <linux/vt_kern.h>
+#include <linux/consolemap.h>
 #include <linux/sysrq.h>
 #include <linux/input.h>
 #include <linux/reboot.h>
@@ -403,9 +404,12 @@ static unsigned int handle_diacr(struct vc_data *vc, unsigned int ch)
                 return d;
 
         if (kbd->kbdmode == VC_UNICODE)
-                to_utf8(vc, conv_8bit_to_uni(d));
-        else if (d < 0x100)
-                put_queue(vc, d);
+                to_utf8(vc, d);
+        else {
+                int c = conv_uni_to_8bit(d);
+                if (c != -1)
+                        put_queue(vc, c);
+        }
 
         return ch;
 }
@@ -417,9 +421,12 @@ static void fn_enter(struct vc_data *vc)
 {
         if (diacr) {
                 if (kbd->kbdmode == VC_UNICODE)
-                        to_utf8(vc, conv_8bit_to_uni(diacr));
-                else if (diacr < 0x100)
-                        put_queue(vc, diacr);
+                        to_utf8(vc, diacr);
+                else {
+                        int c = conv_uni_to_8bit(diacr);
+                        if (c != -1)
+                                put_queue(vc, c);
+                }
                 diacr = 0;
         }
         put_queue(vc, 13);
@@ -627,9 +634,12 @@ static void k_unicode(struct vc_data *vc, unsigned int value, char up_flag)
                 return;
         }
         if (kbd->kbdmode == VC_UNICODE)
-                to_utf8(vc, conv_8bit_to_uni(value));
-        else if (value < 0x100)
-                put_queue(vc, value);
+                to_utf8(vc, value);
+        else {
+                int c = conv_uni_to_8bit(value);
+                if (c != -1)
+                        put_queue(vc, c);
+        }
 }
 
 /*
@@ -646,7 +656,12 @@ static void k_deadunicode(struct vc_data *vc, unsigned int value, char up_flag)
 
 static void k_self(struct vc_data *vc, unsigned char value, char up_flag)
 {
-        k_unicode(vc, value, up_flag);
+        unsigned int uni;
+        if (kbd->kbdmode == VC_UNICODE)
+                uni = value;
+        else
+                uni = conv_8bit_to_uni(value);
+        k_unicode(vc, uni, up_flag);
 }
 
 static void k_dead2(struct vc_data *vc, unsigned char value, char up_flag)