Check os_snprintf() result more consistently - success case

This converts os_snprintf() result validation cases to use
os_snprintf_error() in cases where success condition was used to execute
a step. These changes were done automatically with spatch using the
following semantic patch:

@@
expression E1,E2,E3;
statement S1;
@@

  E1 = os_snprintf(E2, E3, ...);
- if (\( E1 >= 0 \| E1 > 0 \) && \( (size_t) E1 < E3 \| E1 < (int) E3 \| E1 < E3 \))
+ if (!os_snprintf_error(E3, E1))
  S1

Signed-off-by: Jouni Malinen <j@w1.fi>

src/ap/wps_hostapd.c

@@ -185,7 +185,7 @@ static void hostapd_wps_pin_needed_cb(void *ctx, const u8 *uuid_e,
 			  dev->model_number, dev->serial_number,
 			  wps_dev_type_bin2str(dev->pri_dev_type, devtype,
 					       sizeof(devtype)));
-	if (len > 0 && len < (int) sizeof(txt))
+	if (!os_snprintf_error(sizeof(txt), len))
 		wpa_msg(hapd->msg_ctx, MSG_INFO, "%s", txt);
 
 	if (hapd->conf->wps_pin_requests) {

src/drivers/driver_nl80211_event.c

@@ -1015,7 +1015,7 @@ static void send_scan_event(struct wpa_driver_nl80211_data *drv, int aborted,
 			freqs[num_freqs] = nla_get_u32(nl);
 			res = os_snprintf(pos, end - pos, " %d",
 					  freqs[num_freqs]);
-			if (res > 0 && end - pos > res)
+			if (!os_snprintf_error(end - pos, res))
 				pos += res;
 			num_freqs++;
 			if (num_freqs == MAX_REPORT_FREQS - 1)

src/eap_server/eap_server_ttls.c

@@ -409,7 +409,7 @@ static struct wpabuf * eap_ttls_build_phase2_mschapv2(
 				       RADIUS_VENDOR_ID_MICROSOFT, 1, 43);
 		*pos++ = data->mschapv2_ident;
 		ret = os_snprintf((char *) pos, end - pos, "S=");
-		if (ret >= 0 && ret < end - pos)
+		if (!os_snprintf_error(end - pos, ret))
 			pos += ret;
 		pos += wpa_snprintf_hex_uppercase(
 			(char *) pos, end - pos, data->mschapv2_auth_response,

wpa_supplicant/config.c

@@ -1310,7 +1310,7 @@ static int wpa_config_parse_wep_key(u8 *key, size_t *len, int line,
 	os_memcpy(key, buf, *len);
 	str_clear_free(buf);
 	res = os_snprintf(title, sizeof(title), "wep_key%d", idx);
-	if (res >= 0 && (size_t) res < sizeof(title))
+	if (!os_snprintf_error(sizeof(title), res))
 		wpa_hexdump_key(MSG_MSGDUMP, title, key, *len);
 	return 0;
 }

wpa_supplicant/ctrl_iface.c

@@ -2260,7 +2260,7 @@ static char * wpa_supplicant_wps_ie_txt_buf(struct wpa_supplicant *wpa_s,
 		txt = "[WPS]";
 
 	ret = os_snprintf(pos, end - pos, "%s", txt);
-	if (ret >= 0 && ret < end - pos)
+	if (!os_snprintf_error(end - pos, ret))
 		pos += ret;
 	wpabuf_free(wps_ie);
 	return pos;

wpa_supplicant/wpa_cli.c

@@ -3681,7 +3681,7 @@ static void update_ifnames(struct wpa_ctrl *ctrl)
 			break;
 		*end = '\0';
 		ret = os_snprintf(txt, sizeof(txt), "ifname=%s", pos);
-		if (ret > 0 && ret < (int) sizeof(txt))
+		if (!os_snprintf_error(sizeof(txt), ret))
 			cli_txt_list_add(&ifnames, txt);
 		pos = end + 1;
 	}

wpa_supplicant/wps_supplicant.c

@@ -1318,7 +1318,7 @@ static void wpas_wps_pin_needed_cb(void *ctx, const u8 *uuid_e,
 			  dev->model_number, dev->serial_number,
 			  wps_dev_type_bin2str(dev->pri_dev_type, devtype,
 					       sizeof(devtype)));
-	if (len > 0 && len < (int) sizeof(txt))
+	if (!os_snprintf_error(sizeof(txt), len))
 		wpa_printf(MSG_INFO, "%s", txt);
 }