Add FreeBSD support for temperature and battery components

components/temperature.c

@@ -3,6 +3,7 @@
 
 #include "../util.h"
 
+
 #if defined(__linux__)
 	#include <stdint.h>
 
@@ -46,4 +47,25 @@
 		/* kelvin to celsius */
 		return bprintf("%d", (temp.value - 273150000) / 1E6);
 	}
+#elif defined(__FreeBSD__)
+	#include <stdio.h>
+	#include <stdlib.h>
+	#include <sys/sysctl.h>
+
+	const char *
+	temp(const char *zone)
+	{
+		char buf[256];
+		int temp;
+		size_t len;
+
+		len = sizeof(temp);
+		snprintf(buf, sizeof(buf), "hw.acpi.thermal.%s.temperature", zone);
+		if (sysctlbyname(buf, &temp, &len, NULL, 0) == -1
+				|| !len)
+			return NULL;
+
+		/* kelvin to decimal celcius */
+		return bprintf("%d.%d", (temp - 2731) / 10, abs((temp - 2731) % 10));
+	}
 #endif