infinite displays in top

[Ted Unangst]

I would like to be able to ask for an infinite number of updates in
top even in noninteractive mode. top -d 900000000 doesn't cut it.

Allow -1 to specify infinity.

Index: top.c
===================================================================
RCS file: /cvs/src/usr.bin/top/top.c,v
retrieving revision 1.80
diff -u -p -r1.80 top.c
--- top.c       14 Jan 2013 21:33:59 -0000      1.80
+++ top.c       13 Dec 2013 06:09:17 -0000
@@ -200,7 +200,10 @@ parseargs(int ac, char **av)
                        break;
 
                case 'd':       /* number of displays to show */
-                       if ((i = atoiwi(optarg)) != Invalid && i != 0) {
+                       if (strcmp(optarg, "-1") == 0) {
+                               displays = -1;
+                               break;
+                       } else if ((i = atoiwi(optarg)) != Invalid && i != 0) {
                                displays = i;
                                if (displays == 1)
                                        interactive = No;