(mark_coding_system): Mark initial-charset-g0 and -g1 of CODESYS_BIG5

in XEmacs UTF-2000.
(allocate_coding_system): Initialize initial-charsets of CODESYS_BIG5
in XEmacs UTF-2000.
(Fmake_coding_system): Accept `charset-g0' and `charset-g1' for
CODESYS_BIG5 in XEmacs UTF-2000.
(decode_coding_big5): Use initial-charset-g0 and -g1 of CODESYS_BIG5
in XEmacs UTF-2000; use `DECODE_DEFINED_CHAR'.

diff --git a/src/text-coding.c b/src/text-coding.c
index 35e8523..ee37027 100644 (file)
--- a/src/text-coding.c
+++ b/src/text-coding.c
@@ -379,6 +379,13 @@ mark_coding_system (Lisp_Object obj)
            }
        }
       break;
+#ifdef UTF2000
+
+    case CODESYS_BIG5:
+      mark_object (CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, 0));
+      mark_object (CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, 1));
+      break;
+#endif
 
     case CODESYS_CCL:
       mark_object (CODING_SYSTEM_CCL_DECODE (codesys));
@@ -644,6 +651,19 @@ allocate_coding_system (enum coding_system_type type, Lisp_Object name)
       for (i = 0; i < 4; i++)
        CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, i) = Qnil;
     }
+#ifdef UTF2000
+  if (type == CODESYS_BIG5)
+    {
+      CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, 0)
+       = Vcharset_ascii;
+      CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, 1)
+       = Vcharset_chinese_big5;
+      CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, 2)
+       = Qnil;
+      CODING_SYSTEM_ISO2022_INITIAL_CHARSET (codesys, 3)
+       = Qnil;
+    }
+#endif
   else if (type == CODESYS_CCL)
     {
       CODING_SYSTEM_CCL_DECODE (codesys) = Qnil;
@@ -994,6 +1014,15 @@ if TYPE is 'ccl:
            else
              signal_simple_error ("Unrecognized property", key);
          }
+#ifdef UTF2000
+       else if (ty == CODESYS_BIG5)
+         {
+           if      (EQ (key, Qcharset_g0)) FROB_INITIAL_CHARSET (0);
+           else if (EQ (key, Qcharset_g1)) FROB_INITIAL_CHARSET (1);
+           else
+             signal_simple_error ("Unrecognized property", key);
+         }
+#endif
        else if (EQ (type, Qccl))
          {
            Lisp_Object sym;
@@ -3579,6 +3608,11 @@ decode_coding_big5 (Lstream *decoding, const Extbyte *src,
   unsigned int flags  = str->flags;
   unsigned int cpos   = str->cpos;
   eol_type_t eol_type = str->eol_type;
+#ifdef UTF2000
+  Lisp_Object ccs
+    = CODING_SYSTEM_ISO2022_INITIAL_CHARSET (DECODING_STREAM_DATA
+                                            (decoding)->codesys, 1);
+#endif
 
   while (n--)
     {
@@ -3589,9 +3623,12 @@ decode_coding_big5 (Lstream *decoding, const Extbyte *src,
          if (BYTE_BIG5_TWO_BYTE_2_P (c))
            {
 #ifdef UTF2000
-             DECODE_ADD_UCS_CHAR
-               (DECODE_CHAR (Vcharset_chinese_big5, (cpos << 8) | c),
-                dst);
+             int code_point = (cpos << 8) | c;
+             Emchar char_id = DECODE_DEFINED_CHAR (ccs, code_point);
+
+             if (char_id < 0)
+               char_id = DECODE_CHAR (Vcharset_chinese_big5, code_point);
+             DECODE_ADD_UCS_CHAR (char_id, dst);
 #else
              unsigned char b1, b2, b3;
              DECODE_BIG5 (cpos, c, b1, b2, b3);