Battery: Split operating system specific code

This removes all operating system specific code from the main
battery file into their own source files. CMake will add the
correct implementation automatically.

src/battery/openbsd.c

@@ -0,0 +1,84 @@
+/**************************************************************************
+*
+* Tint2 : OpenBSD & NetBSD battery
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License version 2
+* or any later version as published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+**************************************************************************/
+
+#if defined(__OpenBSD__) || defined(__NetBSD__)
+
+//#include <machine/apmvar.h>
+#include <err.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "common.h"
+#include "battery.h"
+
+int apm_fd = -1;
+
+gboolean battery_os_init() {
+	if (apm_fd > 0)
+		close(apm_fd);
+
+	apm_fd = open("/dev/apm", O_RDONLY);
+
+	if (apm_fd < 0) {
+		warn("ERROR: battery applet cannot open /dev/apm.");
+		return FALSE;
+	} else {
+		return TRUE;
+	}
+}
+
+void battery_os_free() {
+	if ((apm_fd != -1) && (close(apm_fd) == -1))
+		warn("cannot close /dev/apm");
+	apm_fd = -1;
+}
+
+int battery_os_update(struct batstate *state) {
+	struct apm_power_info info;
+
+	if (apm_fd > 0 && ioctl(apm_fd, APM_IOC_GETPOWER, &(info)) == 0) {
+		// best attempt at mapping to Linux battery states
+		switch (info.battery_state) {
+		case APM_BATT_CHARGING:
+			state->state = BATTERY_CHARGING;
+			break;
+		default:
+			state->state = BATTERY_DISCHARGING;
+			break;
+		}
+
+		if (info.battery_life == 100)
+			state->state = BATTERY_FULL;
+
+		if (info.minutes_left != -1)
+			batstate_set_time(state, info.minutes_left * 60);
+
+		state->percentage = info.battery_life;
+	} else {
+		warn("power update: APM_IOC_GETPOWER");
+		return -1;
+	}
+
+	return 0;
+}
+
+char* battery_os_tooltip() {
+	return strdup("Operating System not supported");
+}
+
+#endif