(Faset): Adjust the way to check byte-combining

possibility for the new handling of multibyte sequence.

diff --git a/src/data.c b/src/data.c
index a7e16c9..c1cfb81 100644 (file)
--- a/src/data.c
+++ b/src/data.c
@@ -1859,13 +1859,14 @@ IDX starts at 0.")
        error ("Attempt to change byte length of a string");
 
       /* We can't accept a change causing byte combining.  */
-      if ((idxval > 0 && !CHAR_HEAD_P (*str)
-          && (prev_byte = string_char_to_byte (array, idxval - 1),
-              (prev_byte + 1 < idxval_byte
-               || (p[-1] >= 0x80 && p[-1] < 0xA0))))
-         || (idxval < XSTRING (array)->size - 1
-             && (*str >=0x80 && *str < 0xA0)
-             && !CHAR_HEAD_P (p[actual_len])))
+      if (!ASCII_BYTE_P (*str)
+         && ((idxval > 0 && !CHAR_HEAD_P (*str)
+              && (prev_byte = string_char_to_byte (array, idxval - 1),
+                  BYTES_BY_CHAR_HEAD (XSTRING (array)->data[prev_byte])
+                  > idxval_byte - prev_byte))
+             || (idxval < XSTRING (array)->size - 1
+                 && !CHAR_HEAD_P (p[actual_len])
+                 && new_len < BYTES_BY_CHAR_HEAD (*str))))
        error ("Attempt to change char length of a string");
       while (new_len--)
        *p++ = *str++;