top: expand 'Ctrl' bottom window to display other data

This commit adds support for displaying the namespaces
in top's separate bottom 'Ctrl' window. Along the way,
the plumbing is now in place to extend this capability
to other data (if we don't run out of '^' keystrokes).

Signed-off-by: Jim Warner <james.warner@comcast.net>

top/top.c

@@ -104,16 +104,21 @@ static int   Screen_cols, Screen_rows, Max_lines;
 
         // these are for the special separate bottom 'window'
 #define      SCREEN_ROWS ( Screen_rows - Bot_rsvd )
+#define      BOT_MAXIMUM  10
+#define      BOT_DELIMIT  -1
+#define      BOT_MISC_NS  +1
         // 1 for horizontal separator
 #define      BOT_RSVD  1
-#define      BOT_KEEP  Bot_show = 0
+#define      BOT_KEEP  Bot_func = NULL
-#define      BOT_TOSS  do { Bot_show = 0; \
+#define      BOT_TOSS  do { Bot_func = NULL; Bot_item[0] = BOT_DELIMIT; \
-                Bot_task = Bot_rsvd = Bot_item = 0; } while(0)
+                Bot_task = Bot_rsvd = Bot_misc = 0; \
-static int   Bot_show,
+                } while(0)
+static int   Bot_task,
+             Bot_misc,
              Bot_rsvd,
-             Bot_task;
+             Bot_item[BOT_MAXIMUM] = { BOT_DELIMIT };
-enum pflag   Bot_item;
 static char *Bot_name;
+static void(*Bot_func)(void);
 
         /* This is really the number of lines needed to display the summary
            information (0 - nn), but is used as the relative row where we
@@ -2095,7 +2100,11 @@ static void build_headers (void) {
          else ckITEM(f);
 
          // lastly, accommodate any special non-display 'tagged' needs...
-         ckITEM(Bot_item);
+         i = 0;
+         while (Bot_item[i] > BOT_DELIMIT) {
+            ckITEM(Bot_item[i]);
+            ++i;
+         }
       } // end: VIZISw(w)
 
       if (Rc.mode_altscr) w = w->next;
@@ -4907,7 +4916,6 @@ static void bot_do_see (const char *str, const char *pgm) {
 } // end: bot_do_see
 
 
-
         /*
          * This guy manages the bottom margin window, |
          * showing misc stuff based on a single item. | */
@@ -4921,7 +4929,7 @@ static void bot_item_show (void) {
          break;
    }
    if (i < PIDSmaxt) {
-      bot_do_see(PID_VAL(Bot_item, str, p), PID_VAL(EU_CMD, str, p));
+      bot_do_see(PID_VAL(Bot_item[0], str, p), PID_VAL(EU_CMD, str, p));
    }
 #ifdef BOT_DEAD_ZAP
    else
@@ -4937,15 +4945,100 @@ static void bot_item_show (void) {
          * bottom window or arranging to turn it off. | */
 static void bot_item_toggle (enum pflag item, const char *name) {
    // if already targeted, assume user wants to turn it off ...
-   if (Bot_item == item) {
+   if (Bot_item[0] == item) {
       BOT_TOSS;
    } else {
-      Bot_item = item;
+      Bot_misc = 0;
+      Bot_item[0] = item;
+      Bot_item[1] = BOT_DELIMIT;
       Bot_name = (char*)name;
-      Bot_show = 1;
+      Bot_func = bot_item_show;
       Bot_task = PID_VAL(EU_PID, s_int, Curwin->ppt[Curwin->begtask]);
    }
 } // end: bot_item_toggle
+
+
+static struct {
+   enum pflag this;
+   enum namespace_type that;
+} ns_tab[] = {
+   { EU_NS7, PROCPS_NS_CGROUP }, { EU_NS1, PROCPS_NS_IPC  },
+   { EU_NS2, PROCPS_NS_MNT    }, { EU_NS3, PROCPS_NS_NET  },
+   { EU_NS4, PROCPS_NS_PID    }, { EU_NS8, PROCPS_NS_TIME },
+   { EU_NS5, PROCPS_NS_USER   }, { EU_NS6, PROCPS_NS_UTS  }
+};
+
+        /*
+         * A helper function that will gather various |
+         * stuff for dislay by the bot_misc_show guy. | */
+static char *bot_misc_hlp (struct pids_stack *p) {
+   static char buf[BIGBUFSIZ], *b;
+   int i;
+
+   buf[0] = '\0';
+   switch (Bot_misc) {
+      case BOT_MISC_NS:
+         b = &buf[0];
+         for (i = 0; i < MAXTBL(ns_tab); i++)
+            b = scat(b, fmtmk("%s: %-10lu  "
+               , procps_ns_get_name(ns_tab[i].that), PID_VAL(ns_tab[i].this, ul_int, p)));
+         break;
+      default:
+         break;
+   }
+   return buf;
+} // end: bot_misc_hlp
+
+
+        /*
+         * This guy manages the bottom margin window, |
+         * showing misc data based on multiple items. | */
+static void bot_misc_show (void) {
+   struct pids_stack *p;
+   int i;
+
+   for (i = 0; i < PIDSmaxt; i++) {
+      p = Curwin->ppt[i];
+      if (Bot_task == PID_VAL(EU_PID, s_int, p))
+         break;
+   }
+   if (i < PIDSmaxt) {
+      bot_do_see(bot_misc_hlp(p), PID_VAL(EU_CMD, str, p));
+   }
+#ifdef BOT_DEATH
+   else
+      BOT_TOSS;
+#else
+   BOT_KEEP;
+#endif
+} // end: bot_misc_show
+
+
+        /*
+         * This guy toggles between displaying a Ctrl |
+         * bottom window or arranging to turn it off. | */
+static void bot_misc_toggle (int what) {
+   int i;
+
+   // if already targeted, assume user wants to turn it off ...
+   if (Bot_misc == what) {
+      BOT_TOSS;
+   } else {
+      switch (what) {
+         case BOT_MISC_NS:
+            for (i = 0; i < MAXTBL(ns_tab); i++)
+               Bot_item[i] = ns_tab[i].this;
+            Bot_item[i] = BOT_DELIMIT;
+            Bot_name = (char*)"namespaces";
+            break;
+         default:
+            break;
+      }
+      Bot_misc = what;
+      Bot_func = bot_misc_show;
+      Bot_task = PID_VAL(EU_PID, s_int, Curwin->ppt[Curwin->begtask]);
+   }
+} // end: bot_misc_toggle
 
 /*######  Interactive Input Tertiary support  ############################*/
 
@@ -5330,6 +5423,9 @@ static void keys_global (int ch) {
       case kbd_CtrlN:
          bot_item_toggle(EU_ENV, "environment");
          break;
+      case kbd_CtrlP:
+         bot_misc_toggle(BOT_MISC_NS);
+         break;
       case kbd_CtrlR:
          if (Secure_mode)
             show_msg(N_txt(NOT_onsecure_txt));
@@ -6199,7 +6295,7 @@ static void do_key (int ch) {
       { keys_global,
          { '?', 'B', 'd', 'E', 'e', 'f', 'g', 'H', 'h'
          , 'I', 'k', 'r', 's', 'X', 'Y', 'Z', '0'
-         , kbd_CtrlE, kbd_CtrlG, kbd_CtrlK, kbd_CtrlN, kbd_CtrlR, kbd_CtrlU
+         , kbd_CtrlE, kbd_CtrlG, kbd_CtrlK, kbd_CtrlN, kbd_CtrlP, kbd_CtrlR, kbd_CtrlU
          , kbd_ENTER, kbd_SPACE, '\0' } },
       { keys_summary,
          { '!', '1', '2', '3', '4', 'C', 'l', 'm', 't', '\0' } },
@@ -6863,7 +6959,7 @@ static void frame_make (void) {
    }
 
    if (CHKw(w, View_SCROLL) && VIZISw(Curwin)) show_scroll();
-   if (Bot_show) bot_item_show();
+   if (Bot_func) Bot_func();
    fflush(stdout);
 
    /* we'll deem any terminal not supporting tgoto as dumb and disable

top/top.h

@@ -176,6 +176,7 @@ char *strcasestr(const char *haystack, const char *needle);
 #define kbd_CtrlK  '\013'
 #define kbd_CtrlN  '\016'
 #define kbd_CtrlO  '\017'
+#define kbd_CtrlP  '\020'
 #define kbd_CtrlR  '\022'
 #define kbd_CtrlU  '\025'
 
@@ -737,6 +738,9 @@ typedef struct WIN_t {
 //atic void          bot_do_see (const char *str, const char *pgm);
 //atic void          bot_item_show (void);
 //atic void          bot_item_toggle (enum pflag item, const char *name);
+//atic char         *bot_misc_hlp (struct pids_stack *p);
+//atic void          bot_misc_show (void);
+//atic void          bot_misc_toggle (int what);
 /*------  Interactive Input Tertiary support  ----------------------------*/
 //atic inline int    find_ofs (const WIN_t *q, const char *buf);
 //atic void          find_string (int ch);