add library support for logarithms and exponents (!) to support

vt1211 / vt8235 thermistor calculations. Add such calculations to
      vt1211/vt8235 section in sensors.conf; bump library version to 1.4.0.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1667 7894878c-1315-0410-8ee3-d5d059ff63e0

lib/access.c

@@ -19,6 +19,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
 #include "access.h"
 #include "sensors.h"
 #include "data.h"
@@ -395,6 +396,14 @@ int sensors_eval_expr(sensors_chip_name chipname, const sensors_expr *expr,
   case sensors_negate:
     *result = -res1;
     return 0;
+  case sensors_exp:
+    *result = exp(res1);
+    return 0;
+  case sensors_log:
+    if (res1 < 0.0)
+      return -SENSORS_ERR_DIV_ZERO;
+    *result = log(res1);
+    return 0;
   }
   return 0;
 }