ctype functions require an unsigned char

Ensure that characters are represented as unsigned char when using
isblank() and isspace(). These function take in a "int c" argument, but
it needs to be unsigned for the cases where EOF is not indicated.

Signed-off-by: Roy Marples <roy@marples.name>

hostapd/ctrl_iface.c

@@ -1877,13 +1877,13 @@ static int hostapd_ctrl_iface_vendor(struct hostapd_data *hapd, char *cmd,
 
 	/* cmd: <vendor id> <subcommand id> [<hex formatted data>] */
 	vendor_id = strtoul(cmd, &pos, 16);
-	if (!isblank(*pos))
+	if (!isblank((unsigned char) *pos))
 		return -EINVAL;
 
 	subcmd = strtoul(pos, &pos, 10);
 
 	if (*pos != '\0') {
-		if (!isblank(*pos++))
+		if (!isblank((unsigned char) *pos++))
 			return -EINVAL;
 		data_len = os_strlen(pos);
 	}

src/drivers/driver_common.c

@@ -183,12 +183,12 @@ wpa_get_wowlan_triggers(const char *wowlan_triggers,
 
 	start = buf;
 	while (*start != '\0') {
-		while (isblank(*start))
+		while (isblank((unsigned char) *start))
 			start++;
 		if (*start == '\0')
 			break;
 		end = start;
-		while (!isblank(*end) && *end != '\0')
+		while (!isblank((unsigned char) *end) && *end != '\0')
 			end++;
 		last = *end == '\0';
 		*end = '\0';

src/utils/common.c

@@ -86,7 +86,7 @@ int hwaddr_masked_aton(const char *txt, u8 *addr, u8 *mask, u8 maskable)
 		return -1;
 
 	/* check for optional mask */
-	if (*r == '\0' || isspace(*r)) {
+	if (*r == '\0' || isspace((unsigned char) *r)) {
 		/* no mask specified, assume default */
 		os_memset(mask, 0xff, ETH_ALEN);
 	} else if (maskable && *r == '/') {

wpa_supplicant/ctrl_iface.c

@@ -4712,7 +4712,7 @@ static int p2ps_ctrl_parse_cpt_priority(const char *pos, u8 *cpt)
 			return -1;
 		}
 
-		if (isblank(*last)) {
+		if (isblank((unsigned char) *last)) {
 			i++;
 			break;
 		}
@@ -6917,13 +6917,13 @@ static int wpa_supplicant_vendor_cmd(struct wpa_supplicant *wpa_s, char *cmd,
 
 	/* cmd: <vendor id> <subcommand id> [<hex formatted data>] */
 	vendor_id = strtoul(cmd, &pos, 16);
-	if (!isblank(*pos))
+	if (!isblank((unsigned char) *pos))
 		return -EINVAL;
 
 	subcmd = strtoul(pos, &pos, 10);
 
 	if (*pos != '\0') {
-		if (!isblank(*pos++))
+		if (!isblank((unsigned char) *pos++))
 			return -EINVAL;
 		data_len = os_strlen(pos);
 	}