Avoid compiler warning.

* m4/macro.c (process_macro): Use correct type for isdigit.

Signed-off-by: Eric Blake <ebb9@byu.net>

2 files changed, 7 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 3b356c1f..bde4c2b4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-06-15  Eric Blake  <ebb9@byu.net>
+
+	Avoid compiler warning.
+	* m4/macro.c (process_macro): Use correct type for isdigit.
+
 2009-06-13  Eric Blake  <ebb9@byu.net>
 
 	Avoid snprintf link failures.
diff --git a/m4/macro.c b/m4/macro.c
index fc28cd35..76ccca76 100644
--- a/m4/macro.c
+++ b/m4/macro.c
@@ -740,7 +740,8 @@ process_macro (m4 *context, m4_symbol_value *value, m4_obstack *obs,
 	     syntax instead of $10; see
 	     http://lists.gnu.org/archive/html/m4-discuss/2006-08/msg00028.html
 	     for more discussion.  */
-	  if (m4_get_posixly_correct_opt (context) || !isdigit(text[1]))
+	  if (m4_get_posixly_correct_opt (context)
+	      || !isdigit (to_uchar (text[1])))
 	    {
 	      i = *text++ - '0';
 	      len--;