(char_charset): Return NULL if the arg charset_list is

specified and C doesn't belong to any of them.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/charset.c b/src/charset.c
index 052c511f6a3..a08089d6d2c 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -1813,8 +1813,12 @@ char_charset (c, charset_list, code_return)
      Lisp_Object charset_list;
      unsigned *code_return;
 {
+  int maybe_null = 0;
+
   if (NILP (charset_list))
     charset_list = Vcharset_ordered_list;
+  else
+    maybe_null = 1;
 
   while (CONSP (charset_list))
     {
@@ -1832,7 +1836,8 @@ char_charset (c, charset_list, code_return)
          && EQ (charset_list, Vcharset_non_preferred_head))
         return CHARSET_FROM_ID (charset_unicode);
     }
-  return (c <= MAX_5_BYTE_CHAR ? CHARSET_FROM_ID (charset_emacs)
+  return (maybe_null ? NULL
+          : c <= MAX_5_BYTE_CHAR ? CHARSET_FROM_ID (charset_emacs)
           : CHARSET_FROM_ID (charset_eight_bit));
 }