Fix incorrect uses of ctype.h (passing it uncast chars, or other

things potentially not in the range 0..255).

[originally from svn r8922]

1 files changed, 1 insertions, 1 deletions

diff --git a/signpost.c b/signpost.c
index b6db3a3..efed3f7 100644
--- a/signpost.c
+++ b/signpost.c
@@ -513,7 +513,7 @@ static void unpick_desc(game_params *params, char *desc,
         }
 
         c = *desc;
-        if (isdigit(c)) {
+        if (isdigit((unsigned char)c)) {
             num = (num*10) + (int)(c-'0');
             if (num > state->n) {
                 msg = "Number too large";