Avoid aborts when keyboard-coding-system is raw-text (Bug#19532)

 src/coding.c (raw_text_coding_system_p): New function.
 src/keyboard.c (read_decoded_event_from_main_queue): Use it when the
 keyboard coding-system is 'raw-text'.
 src/coding.h (raw_text_coding_system_p): Add prototype.

4 files changed, 51 insertions, 21 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 6208738cc5..9e564ea641 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,12 @@
+2015-01-31  Eli Zaretskii  <eliz@gnu.org>
+
+	* coding.c (raw_text_coding_system_p): New function.
+
+	* keyboard.c (read_decoded_event_from_main_queue): Use it when the
+	keyboard coding-system is 'raw-text'.  (Bug#19532)
+
+	* coding.h (raw_text_coding_system_p): Add prototype.
+
 2015-01-31  Andreas Schwab  <schwab@linux-m68k.org>
 
 	* Makefile.in (gl-stamp): Generate globals.h through the use of
diff --git a/src/coding.c b/src/coding.c
index a7128ee3e7..1a0e127964 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -5979,6 +5979,15 @@ raw_text_coding_system (Lisp_Object coding_system)
 	  : AREF (raw_text_eol_type, 2));
 }
 
+/* Return true if CODING corresponds to raw-text coding-system.  */
+
+bool
+raw_text_coding_system_p (struct coding_system *coding)
+{
+  return (coding->decoder == decode_coding_raw_text
+	  && coding->encoder == encode_coding_raw_text) ? true : false;
+}
+
 
 /* If CODING_SYSTEM doesn't specify end-of-line format, return one of
    the subsidiary that has the same eol-spec as PARENT (if it is not
diff --git a/src/coding.h b/src/coding.h
index d49d786e6d..c73a9cc326 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -705,6 +705,7 @@ extern Lisp_Object code_convert_string_norecord (Lisp_Object, Lisp_Object,
 extern Lisp_Object encode_file_name (Lisp_Object);
 extern Lisp_Object decode_file_name (Lisp_Object);
 extern Lisp_Object raw_text_coding_system (Lisp_Object);
+extern bool raw_text_coding_system_p (struct coding_system *);
 extern Lisp_Object coding_inherit_eol_type (Lisp_Object, Lisp_Object);
 extern Lisp_Object complement_process_encoding_system (Lisp_Object);
 
diff --git a/src/keyboard.c b/src/keyboard.c
index 7718f8efa7..1176d701f2 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -2288,30 +2288,41 @@ read_decoded_event_from_main_queue (struct timespec *end_time,
 	    { /* An encoded byte sequence, let's try to decode it.  */
 	      struct coding_system *coding
 		= TERMINAL_KEYBOARD_CODING (terminal);
-	      unsigned char src[MAX_ENCODED_BYTES];
-	      unsigned char dest[MAX_ENCODED_BYTES * MAX_MULTIBYTE_LENGTH];
-	      int i;
-	      for (i = 0; i < n; i++)
-		src[i] = XINT (events[i]);
-	      if (meta_key != 2)
-		for (i = 0; i < n; i++)
-		  src[i] &= ~0x80;
-	      coding->destination = dest;
-	      coding->dst_bytes = sizeof dest;
-	      decode_coding_c_string (coding, src, n, Qnil);
-	      eassert (coding->produced_char <= n);
-	      if (coding->produced_char == 0)
-		{ /* The encoded sequence is incomplete.  */
-		  if (n < MAX_ENCODED_BYTES) /* Avoid buffer overflow.  */
-		    continue;		     /* Read on!  */
+
+	      if (raw_text_coding_system_p (coding))
+		{
+		  int i;
+		  if (meta_key != 2)
+		    for (i = 0; i < n; i++)
+		      events[i] = make_number (XINT (events[i]) & ~0x80);
 		}
 	      else
 		{
-		  const unsigned char *p = coding->destination;
-		  eassert (coding->carryover_bytes == 0);
-		  n = 0;
-		  while (n < coding->produced_char)
-		    events[n++] = make_number (STRING_CHAR_ADVANCE (p));
+		  unsigned char src[MAX_ENCODED_BYTES];
+		  unsigned char dest[MAX_ENCODED_BYTES * MAX_MULTIBYTE_LENGTH];
+		  int i;
+		  for (i = 0; i < n; i++)
+		    src[i] = XINT (events[i]);
+		  if (meta_key != 2)
+		    for (i = 0; i < n; i++)
+		      src[i] &= ~0x80;
+		  coding->destination = dest;
+		  coding->dst_bytes = sizeof dest;
+		  decode_coding_c_string (coding, src, n, Qnil);
+		  eassert (coding->produced_char <= n);
+		  if (coding->produced_char == 0)
+		    { /* The encoded sequence is incomplete.  */
+		      if (n < MAX_ENCODED_BYTES) /* Avoid buffer overflow.  */
+			continue;		     /* Read on!  */
+		    }
+		  else
+		    {
+		      const unsigned char *p = coding->destination;
+		      eassert (coding->carryover_bytes == 0);
+		      n = 0;
+		      while (n < coding->produced_char)
+			events[n++] = make_number (STRING_CHAR_ADVANCE (p));
+		    }
 		}
 	    }
 	  /* Now `events' should hold decoded events.