sysctl(8): add -F option to print temps in freedom units

[joshua stein]

Index: sbin/sysctl/sysctl.8
===================================================================
RCS file: /cvs/src/sbin/sysctl/sysctl.8,v
retrieving revision 1.214
diff -u -p -u -p -r1.214 sysctl.8
--- sbin/sysctl/sysctl.8        16 Feb 2018 07:27:07 -0000      1.214
+++ sbin/sysctl/sysctl.8        19 Feb 2018 17:10:19 -0000
@@ -68,6 +68,8 @@ flag; for the table values, the name of 
 List all the currently available string or integer values.
 This is the default, if no parameters are given to
 .Nm .
+.It Fl F
+Print temperature fields in Fahrenheit rather than Celsius.
 .It Fl n
 Suppress printing of the field name, only output the field value.
 Useful for setting shell variables.
Index: sbin/sysctl/sysctl.c
===================================================================
RCS file: /cvs/src/sbin/sysctl/sysctl.c,v
retrieving revision 1.230
diff -u -p -u -p -r1.230 sysctl.c
--- sbin/sysctl/sysctl.c        16 Feb 2018 07:27:07 -0000      1.230
+++ sbin/sysctl/sysctl.c        19 Feb 2018 17:10:19 -0000
@@ -158,7 +158,7 @@ struct list secondlevel[] = {
        { 0, 0 },                       /* CTL_VFS */
 };
 
-int    Aflag, aflag, nflag, qflag;
+int    Aflag, aflag, Fflag, nflag, qflag;
 
 /*
  * Variables requiring special processing.
@@ -221,7 +221,7 @@ main(int argc, char *argv[])
 {
        int ch, lvl1;
 
-       while ((ch = getopt(argc, argv, "Aanqw")) != -1) {
+       while ((ch = getopt(argc, argv, "AaFnqw")) != -1) {
                switch (ch) {
 
                case 'A':
@@ -232,6 +232,10 @@ main(int argc, char *argv[])
                        aflag = 1;
                        break;
 
+               case 'F':
+                       Fflag = 1;
+                       break;
+
                case 'n':
                        nflag = 1;
                        break;
@@ -2561,8 +2565,12 @@ print_sensor(struct sensor *s)
        else {
                switch (s->type) {
                case SENSOR_TEMP:
-                       printf("%.2f degC",
-                           (s->value - 273150000) / 1000000.0);
+                       if (Fflag)
+                               printf("%.2f degF",
+                                   (s->value * 1.8 - 459670000) / 1000000.0);
+                       else
+                               printf("%.2f degC",
+                                   (s->value - 273150000) / 1000000.0);
                        break;
                case SENSOR_FANRPM:
                        printf("%lld RPM", s->value);