wpa_cli: Use .wpa_cli_history under Android

wpa_cli already implements a command history file for easy accessing
commands previously used. Enable the functionality on Android, too.

Signed-off-by: Mikael Kanstrup <mikael.kanstrup@sonymobile.com>

wpa_supplicant/Android.mk

@@ -40,6 +40,9 @@ endif
 L_CFLAGS += -DCONFIG_CTRL_IFACE_CLIENT_DIR=\"/data/misc/wifi/sockets\"
 L_CFLAGS += -DCONFIG_CTRL_IFACE_DIR=\"/data/system/wpa_supplicant\"
 
+# Use Android specific directory for wpa_cli command completion history
+L_CFLAGS += -DCONFIG_WPA_CLI_HISTORY_DIR=\"/data/misc/wifi\"
+
 # To force sizeof(enum) = 4
 ifeq ($(TARGET_ARCH),arm)
 L_CFLAGS += -mabi=aapcs-linux

wpa_supplicant/wpa_cli.c

@@ -3781,7 +3781,11 @@ static void start_edit(void)
 	ps = wpa_ctrl_get_remote_ifname(ctrl_conn);
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 
+#ifdef CONFIG_WPA_CLI_HISTORY_DIR
+	home = CONFIG_WPA_CLI_HISTORY_DIR;
+#else /* CONFIG_WPA_CLI_HISTORY_DIR */
 	home = getenv("HOME");
+#endif /* CONFIG_WPA_CLI_HISTORY_DIR */
 	if (home) {
 		const char *fname = ".wpa_cli_history";
 		int hfile_len = os_strlen(home) + 1 + os_strlen(fname) + 1;