C++ os_snprintf函数代码示例

static int hostapd_cli_cmd_nfc_get_handover_sel(struct wpa_ctrl *ctrl,
						int argc, char *argv[])
{
	char cmd[64];
	int res;

	if (argc != 2) {
		printf("Invalid 'nfc_get_handover_sel' command - two arguments "
		       "are required.\n");
		return -1;
	}

	res = os_snprintf(cmd, sizeof(cmd), "NFC_GET_HANDOVER_SEL %s %s",
			  argv[0], argv[1]);
	if (os_snprintf_error(sizeof(cmd), res)) {
		printf("Too long NFC_GET_HANDOVER_SEL command.\n");
		return -1;
	}
	return wpa_ctrl_command(ctrl, cmd);
}

static int hostapd_get_sta_conn_time(struct sta_info *sta,
				     char *buf, size_t buflen)
{
	struct os_time now, age;
	int len = 0, ret;

	if (!sta->connected_time.sec)
		return 0;

	os_get_time(&now);
	os_time_sub(&now, &sta->connected_time, &age);

	ret = os_snprintf(buf + len, buflen - len, "connected_time=%u\n",
			  (unsigned int) age.sec);
	if (ret < 0 || (size_t) ret >= buflen - len)
		return len;
	len += ret;

	return len;
}

static int hostapd_cli_cmd_wps_nfc_config_token(struct wpa_ctrl *ctrl,
						int argc, char *argv[])
{
	char cmd[64];
	int res;

	if (argc != 1) {
		printf("Invalid 'wps_nfc_config_token' command - one argument "
		       "is required.\n");
		return -1;
	}

	res = os_snprintf(cmd, sizeof(cmd), "WPS_NFC_CONFIG_TOKEN %s",
			  argv[0]);
	if (os_snprintf_error(sizeof(cmd), res)) {
		printf("Too long WPS_NFC_CONFIG_TOKEN command.\n");
		return -1;
	}
	return wpa_ctrl_command(ctrl, cmd);
}

const char * hostapd_ip_txt(const struct hostapd_ip_addr *addr, char *buf,
			    size_t buflen)
{
	if (buflen == 0 || addr == NULL)
		return NULL;

	if (addr->af == AF_INET) {
		os_snprintf(buf, buflen, "%s", inet_ntoa(addr->u.v4));
	} else {
		buf[0] = '\0';
	}
#ifdef CONFIG_IPV6
	if (addr->af == AF_INET6) {
		if (inet_ntop(AF_INET6, &addr->u.v6, buf, buflen) == NULL)
			buf[0] = '\0';
	}
#endif /* CONFIG_IPV6 */

	return buf;
}

static struct eap_sim_reauth *
db_get_reauth(struct eap_sim_db_data *data, const char *reauth_id)
{
	char cmd[256];

	if (!valid_db_string(reauth_id))
		return NULL;
	os_memset(&data->db_tmp_reauth, 0, sizeof(data->db_tmp_reauth));
	os_strlcpy(data->db_tmp_pseudonym_str, reauth_id,
		   sizeof(data->db_tmp_pseudonym_str));
	data->db_tmp_reauth.reauth_id = data->db_tmp_pseudonym_str;
	os_snprintf(cmd, sizeof(cmd),
		    "SELECT * FROM reauth WHERE reauth_id='%s';", reauth_id);
	if (sqlite3_exec(data->sqlite_db, cmd, get_reauth_cb, data, NULL) !=
	    SQLITE_OK)
		return NULL;
	if (data->db_tmp_reauth.permanent == NULL)
		return NULL;
	return &data->db_tmp_reauth;
}

/**
 * rsn_preauth_get_status - Get pre-authentication status
 * @sm: Pointer to WPA state machine data from wpa_sm_init()
 * @buf: Buffer for status information
 * @buflen: Maximum buffer length
 * @verbose: Whether to include verbose status information
 * Returns: Number of bytes written to buf.
 *
 * Query WPA2 pre-authentication for status information. This function fills in
 * a text area with current status information. If the buffer (buf) is not
 * large enough, status information will be truncated to fit the buffer.
 */
int rsn_preauth_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
			   int verbose)
{
	char *pos = buf, *end = buf + buflen;
	int res, ret;

	if (sm->preauth_eapol) {
		ret = os_snprintf(pos, end - pos, "Pre-authentication "
				  "EAPOL state machines:\n");
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
		res = eapol_sm_get_status(sm->preauth_eapol,
					  pos, end - pos, verbose);
		if (res >= 0)
			pos += res;
	}

	return pos - buf;
}

static int hostapd_cli_cmd_set_neighbor(struct wpa_ctrl *ctrl, int argc,
					char *argv[])
{
	char cmd[2048];
	int res;

	if (argc < 3 || argc > 5) {
		printf("Invalid set_neighbor command: needs 3-5 arguments\n");
		return -1;
	}

	res = os_snprintf(cmd, sizeof(cmd), "SET_NEIGHBOR %s %s %s %s %s",
			  argv[0], argv[1], argv[2], argc >= 4 ? argv[3] : "",
			  argc == 5 ? argv[4] : "");
	if (os_snprintf_error(sizeof(cmd), res)) {
		printf("Too long SET_NEIGHBOR command.\n");
		return -1;
	}
	return wpa_ctrl_command(ctrl, cmd);
}

static int
wrapd_vap_destroy(struct wrap_demon *aptr, int ifname_num)
{
	struct ifreq ifr;
	int res;
    
	os_memset(&ifr, 0, sizeof(ifr));
    res = os_snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "ath%d", ifname_num);
    if (res < 0 || res >= sizeof(ifr.ifr_name)) {
        wrapd_printf("os_snprintf err");
        return -1;
    }  

	if (ioctl(aptr->ioctl_sock, SIOC80211IFDESTROY, &ifr) < 0){
        wrapd_printf("ioctl(SIOC80211IFDESTROY)");
        return -1;
    }

    return 0;
}

int hostapd_ctrl_iface_sta_next(struct hostapd_data *hapd, const char *txtaddr,
				char *buf, size_t buflen)
{
	u8 addr[ETH_ALEN];
	struct sta_info *sta;
	int ret;

	if (hwaddr_aton(txtaddr, addr) ||
	    (sta = ap_get_sta(hapd, addr)) == NULL) {
		ret = os_snprintf(buf, buflen, "FAIL\n");
		if (os_snprintf_error(buflen, ret))
			return 0;
		return ret;
	}

	if (!sta->next)
		return 0;

	return hostapd_ctrl_iface_sta_mib(hapd, sta->next, buf, buflen);
}

static int wpa_supplicant_ctrl_iface_list_networks(
	struct wpa_supplicant *wpa_s, char *buf, size_t buflen)
{
	char *pos, *end;
	struct wpa_ssid *ssid;
	int ret;

	pos = buf;
	end = buf + buflen;
	ret = os_snprintf(pos, end - pos,
			  "network id / ssid / bssid / flags\n");
	if (ret < 0 || ret >= end - pos)
		return pos - buf;
	pos += ret;

	ssid = wpa_s->conf->ssid;
	while (ssid) {
		ret = os_snprintf(pos, end - pos, "%d\t%s",
				  ssid->id,
				  wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
		if (ssid->bssid_set) {
			ret = os_snprintf(pos, end - pos, "\t" MACSTR,
					  MAC2STR(ssid->bssid));
		} else {
			ret = os_snprintf(pos, end - pos, "\tany");
		}
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
		ret = os_snprintf(pos, end - pos, "\t%s%s",
				  ssid == wpa_s->current_ssid ?
				  "[CURRENT]" : "",
				  ssid->disabled ? "[DISABLED]" : "");
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
		ret = os_snprintf(pos, end - pos, "\n");
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;

		ssid = ssid->next;
	}

	return pos - buf;
}

static void recursive_flush_changed_properties(DBusConnection *con,
					       const char *path)
{
	char **objects = NULL;
	char subobj_path[WPAS_DBUS_OBJECT_PATH_MAX];
	int i;

	wpa_dbus_flush_object_changed_properties(con, path);

	if (!dbus_connection_list_registered(con, path, &objects))
		goto out;

	for (i = 0; objects[i]; i++) {
		os_snprintf(subobj_path, WPAS_DBUS_OBJECT_PATH_MAX,
			    "%s/%s", path, objects[i]);
		recursive_flush_changed_properties(con, subobj_path);
	}

out:
	dbus_free_string_array(objects);
}

int linux_br_get(char *brname, const char *ifname)
{
	char path[128], brlink[128], *pos;
	ssize_t res;

	if (!ovs_br_get(brname, ifname))
		return 0;

	os_snprintf(path, sizeof(path), "/sys/class/net/%s/brport/bridge",
		    ifname);
	res = readlink(path, brlink, sizeof(brlink));
	if (res < 0 || (size_t) res >= sizeof(brlink))
		return -1;
	brlink[res] = '\0';
	pos = os_strrchr(brlink, '/');
	if (pos == NULL)
		return -1;
	pos++;
	os_strlcpy(brname, pos, IFNAMSIZ);
	return 0;
}

int wpas_wps_ap_pin_set(struct wpa_supplicant *wpa_s, const char *pin,
			int timeout)
{
	struct hostapd_data *hapd;
	char pin_txt[9];
	int ret;

	if (wpa_s->ap_iface == NULL)
		return -1;
	hapd = wpa_s->ap_iface->bss[0];
	ret = os_snprintf(pin_txt, sizeof(pin_txt), "%s", pin);
	if (ret < 0 || ret >= (int) sizeof(pin_txt))
		return -1;
	os_free(hapd->conf->ap_pin);
	hapd->conf->ap_pin = os_strdup(pin_txt);
	if (hapd->conf->ap_pin == NULL)
		return -1;
	wpas_wps_ap_pin_enable(wpa_s, timeout);

	return 0;
}

int hostapd_ctrl_iface_sta(struct hostapd_data *hapd, const char *txtaddr,
			   char *buf, size_t buflen)
{
	u8 addr[ETH_ALEN];
	int ret;
	const char *pos;
	struct sta_info *sta;

	if (hwaddr_aton(txtaddr, addr)) {
		ret = os_snprintf(buf, buflen, "FAIL\n");
		if (os_snprintf_error(buflen, ret))
			return 0;
		return ret;
	}

	sta = ap_get_sta(hapd, addr);
	if (sta == NULL)
		return -1;

	pos = os_strchr(txtaddr, ' ');
	if (pos) {
		pos++;

#ifdef HOSTAPD_DUMP_STATE
		if (os_strcmp(pos, "eapol") == 0) {
			if (sta->eapol_sm == NULL)
				return -1;
			return eapol_auth_dump_state(sta->eapol_sm, buf,
						     buflen);
		}
#endif /* HOSTAPD_DUMP_STATE */

		return -1;
	}

	ret = hostapd_ctrl_iface_sta_mib(hapd, sta, buf, buflen);
	ret += fst_ctrl_iface_mb_info(addr, buf + ret, buflen - ret);

	return ret;
}

static int wpa_supplicant_global_iface_list(struct wpa_global *global,
					    char *buf, int len)
{
	int i, res;
	struct wpa_interface_info *iface = NULL, *last = NULL, *tmp;
	char *pos, *end;

	for (i = 0; wpa_supplicant_drivers[i]; i++) {
		struct wpa_driver_ops *drv = wpa_supplicant_drivers[i];
		if (drv->get_interfaces == NULL)
			continue;
		tmp = drv->get_interfaces(global->drv_priv);
		if (tmp == NULL)
			continue;

		if (last == NULL)
			iface = last = tmp;
		else
			last->next = tmp;
		while (last->next)
			last = last->next;
	}

	pos = buf;
	end = buf + len;
	for (tmp = iface; tmp; tmp = tmp->next) {
		res = os_snprintf(pos, end - pos, "%s\t%s\t%s\n",
				  tmp->drv_name, tmp->ifname,
				  tmp->desc ? tmp->desc : "");
		if (res < 0 || res >= end - pos) {
			*pos = '\0';
			break;
		}
		pos += res;
	}

	wpa_free_iface_info(iface);

	return pos - buf;
}