Add support for displaying petabyte and exabyte values.

Signed-off-by: Tony Ernst <tee@sgi.com>
---

--- procps-3.2.7/top.c	2011-05-31 10:12:53.000000000 -0500
+++ procps-3.2.7/top.c	2011-05-31 10:33:54.000000000 -0500
@@ -761,16 +761,19 @@
          *    SK_Kb (1) it's kilobytes
          *    SK_Mb (2) it's megabytes
          *    SK_Gb (3) it's gigabytes
-         *    SK_Tb (4) it's terabytes  */
+         *    SK_Tb (4) it's terabytes
+         *    SK_Pb (5) it's petabytes
+         *    SK_Eb (6) it's exabytes  */
 static const char *scale_num (unsigned long num, const int width, const unsigned type)
 {
-      /* kilobytes, megabytes, gigabytes, terabytes, duh! */
-   static double scale[] = { 1024.0, 1024.0*1024, 1024.0*1024*1024, 1024.0*1024*1024*1024, 0 };
-      /* kilo, mega, giga, tera, none */
+      /* kilobytes, megabytes, gigabytes, terabytes, petabytes, exabytes, duh! */
+   static double scale[] = { 1024.0, 1024.0*1024, 1024.0*1024*1024, 1024.0*1024*1024*1024, 
+                             1024.0*1024*1024*1024*1024, 1024.0*1024*1024*1024*1024*1024, 0 };
+      /* kilo, mega, giga, tera, peta, exa, none */
 #ifdef CASEUP_SCALE
-   static char nextup[] =  { 'K', 'M', 'G', 'T', 0 };
+   static char nextup[] =  { 'K', 'M', 'G', 'T', 'P', 'E', 0 };
 #else
-   static char nextup[] =  { 'k', 'm', 'g', 't', 0 };
+   static char nextup[] =  { 'k', 'm', 'g', 't', 'p', 'e', 0 };
 #endif
    static char buf[TNYBUFSIZ];
    double *dp;
--- procps-3.2.7/top.h	2011-05-31 10:38:13.554790767 -0500
+++ procps-3.2.7/top.h	2011-05-31 10:38:43.670693506 -0500
@@ -241,7 +241,7 @@
 // The scaling 'type' used with scale_num() -- this is how
 // the passed number is interpreted should scaling be necessary
 enum scale_num {
-   SK_no, SK_Kb, SK_Mb, SK_Gb, SK_Tb
+   SK_no, SK_Kb, SK_Mb, SK_Gb, SK_Tb, SK_Pb, SK_Eb
 };
 
 // Flags for each possible field