*: fix ctype (isalpha & co.) casts

The correct cast for these is (unsigned char), because "char" could be
signed and thus have some negative value.  isalpha & co. expect an int
arg that is positive, i.e. 0-255.  So we need to cast to (unsigned char)
when calling any of these.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/command_match.c b/lib/command_match.c
index 9456e1585a..26d763849d 100644
--- a/lib/command_match.c
+++ b/lib/command_match.c
@@ -714,7 +714,7 @@ static enum match_type match_ipv4(const char *str)
 				dots++;
 				break;
 			}
-			if (!isdigit((int)*str))
+			if (!isdigit((unsigned char)*str))
 				return no_match;
 
 			str++;
@@ -765,7 +765,7 @@ static enum match_type match_ipv4_prefix(const char *str)
 				break;
 			}
 
-			if (!isdigit((int)*str))
+			if (!isdigit((unsigned char)*str))
 				return no_match;
 
 			str++;
@@ -797,7 +797,7 @@ static enum match_type match_ipv4_prefix(const char *str)
 
 	sp = str;
 	while (*str != '\0') {
-		if (!isdigit((int)*str))
+		if (!isdigit((unsigned char)*str))
 			return no_match;
 
 		str++;