X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=sixteen.c;fp=sixteen.c;h=457e9c9c4a7961ed44e6fa2872d1b49d21d21bc7;hb=e33a57b703f11de067a400505e2425de3a0b5f9e;hp=0e4f8a8cc66d306bbc586c7d624d24c1a0cc6273;hpb=8ac92e860769b822300115064d090cff0645c7dd;p=sgt-puzzles.git

diff --git a/sixteen.c b/sixteen.c
index 0e4f8a8..457e9c9 100644
--- a/sixteen.c
+++ b/sixteen.c
@@ -100,7 +100,7 @@ static void decode_params(game_params *ret, char const *string)
 {
     ret->w = ret->h = atoi(string);
     ret->movetarget = 0;
-    while (*string && isdigit(*string)) string++;
+    while (*string && isdigit((unsigned char)*string)) string++;
     if (*string == 'x') {
         string++;
         ret->h = atoi(string);