coding.c (decode_coding_iso_2022): When an invalid escape sequence is encountered, reset the invocation and designation status to the safest one.

2 files changed, 14 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 31764cad485..99e2c3d9a84 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,9 @@
+2013-04-24  Kenichi Handa  <handa@gnu.org>
+
+        * coding.c (decode_coding_iso_2022): When an invalid escape
+        sequence is encountered, reset the invocation and designation
+        status to the safest one.
+
 2013-04-22  Paul Eggert  <eggert@cs.ucla.edu>
 
         * Makefile.in (bootstrap-clean): Remove stamp-h1 too.
diff --git a/src/coding.c b/src/coding.c
index f9799035b3c..b9fb92c481b 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -3887,6 +3887,14 @@ decode_coding_iso_2022 (struct coding_system *coding)
       *charbuf++ = c < 0 ? -c : ASCII_BYTE_P (c) ? c : BYTE8_TO_CHAR (c);
       char_offset++;
       coding->errors++;
+      /* Reset the invocation and designation status to the safest
+         one; i.e. designate ASCII to the graphic register 0, and
+         invoke that register to the graphic plane 0.  This typically
+         helps the case that an designation sequence for ASCII "ESC (
+         B" is somehow broken (e.g. broken by a newline).  */
+      CODING_ISO_INVOCATION (coding, 0) = 0;
+      CODING_ISO_DESIGNATION (coding, 0) = charset_ascii;
+      charset_id_0 = charset_ascii;
       continue;
 
     break_loop: