cast to unsigned char

lib/isc/tm.c

@@ -161,8 +161,8 @@ isc_tm_strptime(const char *buf, const char *fmt, struct tm *tm) {
 		alt_format = 0;
 
 		/* Eat up white-space. */
-		if (isspace((int) c)) {
-			while (isspace((int) *bp))
+		if (isspace((unsigned char) c)) {
+			while (isspace((unsigned char) *bp))
 				bp++;
 
 			fmt++;
@@ -427,7 +427,7 @@ literal:
 		case 'n':	/* Any kind of white-space. */
 		case 't':
 			LEGAL_ALT(0);
-			while (isspace((int) *bp))
+			while (isspace((unsigned char) *bp))
 				bp++;
 			break;