top: refined memory graphs two abreast summary display

When more than two cpus are displayed per summary area
line in graph form, those memory graphs were scaled to
that same width for consistency & aesthetics. However,
they probably shouldn't have been reduced to less than
terminal width due to a resulting loss of information.

[ after all, detailed memory stats are never reduced ]

So now, supporting logic was refactored to behave just
as it did before the 4 toggle was expanded beyond '1'.

[ the changes impact the 2 memory graphs exclusively ]

Reference(s):
https://www.freelists.org/post/procps/top-enhancements-2-bugs-swatted,1

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

2 files changed, 59 insertions, 43 deletions

diff --git a/src/top/top.c b/src/top/top.c
index b713b61..7a1bc5e 100644
--- a/src/top/top.c
+++ b/src/top/top.c
@@ -229,8 +229,14 @@ static int Numa_node_sel = -1;
 #define GRAPH_prefix_std   25  // '%Cpunnn: 100.0/100.0 100[' or 'nnn-nnn: 100.0/100.0 100['
 #define GRAPH_prefix_abv   12  // '%Cpunnn:100[' or 'nnn-nnn:100[' or 'GiB Mem 100[' or 'GiB Swap 99['
 #define GRAPH_suffix        2  // '] ' (bracket + trailing space)
-static float Graph_adj;        // bars/blocks scaling factor
-static int   Graph_len;        // scaled length (<= GRAPH_length_max)
+        // first 3 more static (adj_geometry), last 3 volatile (sum_tics/do_memory)
+struct graph_parms {
+   float adjust;               // bars/blocks scaling factor
+   int   length;               // scaled length (<= GRAPH_length_max)
+   int   style;                // rc.graph_cpus or rc.graph_mems
+   long  total, part1, part2;  // elements to be graphed
+};
+static struct graph_parms *Graph_cpus, *Graph_mems;
 static const char Graph_blks[] = "                                                                                                    ";
 static const char Graph_bars[] = "||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||";
 
@@ -2073,15 +2079,23 @@ static void adj_geometry (void) {
    if (Curwin->rc.double_up) {
       int num = (Curwin->rc.double_up + 1);
       int pfx = (Curwin->rc.double_up < 2) ? GRAPH_prefix_std : GRAPH_prefix_abv;
-      Graph_len =  (Screen_cols - (ADJOIN_space * Curwin->rc.double_up) - (num * (pfx + GRAPH_suffix))) / num;
+      Graph_cpus->length = (Screen_cols - (ADJOIN_space * Curwin->rc.double_up) - (num * (pfx + GRAPH_suffix))) / num;
+      Graph_mems->length = (Screen_cols - ADJOIN_space - (2 * (GRAPH_prefix_std + GRAPH_suffix))) / 2;
    } else {
-      Graph_len = Screen_cols - (GRAPH_prefix_std + GRAPH_length_max + GRAPH_suffix);
-      if (Graph_len >= 0) Graph_len = GRAPH_length_max;
-      else Graph_len = Screen_cols - GRAPH_prefix_std - GRAPH_suffix;
+      Graph_cpus->length = Screen_cols - (GRAPH_prefix_std + GRAPH_length_max + GRAPH_suffix);
+      if (Graph_cpus->length >= 0) Graph_cpus->length = GRAPH_length_max;
+      else Graph_cpus->length = Screen_cols - GRAPH_prefix_std - GRAPH_suffix;
+      Graph_mems->length = Graph_cpus->length;
    }
-   if (Graph_len < GRAPH_length_min) Graph_len = GRAPH_length_min;
-   if (Graph_len > GRAPH_length_max) Graph_len = GRAPH_length_max;
-   Graph_adj = (float)Graph_len / 100.0;
+   if (Graph_cpus->length < GRAPH_length_min) Graph_cpus->length = GRAPH_length_min;
+   if (Graph_cpus->length > GRAPH_length_max) Graph_cpus->length = GRAPH_length_max;
+   Graph_cpus->adjust = (float)Graph_cpus->length / 100.0;
+   Graph_cpus->style  = Curwin->rc.graph_cpus;
+
+   if (Graph_mems->length < GRAPH_length_min) Graph_mems->length = GRAPH_length_min;
+   if (Graph_mems->length > GRAPH_length_max) Graph_mems->length = GRAPH_length_max;
+   Graph_mems->adjust = (float)Graph_mems->length / 100.0;
+   Graph_mems->style  = Curwin->rc.graph_mems;
 
    fflush(stdout);
 } // end: adj_geometry
@@ -3658,6 +3672,9 @@ static void before (char *me) {
       error_exit(fmtmk(N_fmt(X_THREADINGS_fmt), __LINE__, strerror(errno)));
    pthread_setname_np(Thread_id_tasks, "update tasks");
 #endif
+   // lastly, establish support for graphing cpus & memory
+   Graph_cpus = alloc_c(sizeof(struct graph_parms));
+   Graph_mems = alloc_c(sizeof(struct graph_parms));
  #undef doALL
 } // end: before
 
@@ -6132,7 +6149,7 @@ struct rx_st {
          * A *Helper* function to produce the actual cpu & memory graphs for |
          * these functions -- sum_tics (tertiary) and do_memory (secondary). |
          * (sorry about the name, but it keeps the above comment commitment) | */
-static struct rx_st *sum_rx (long total, long part1, long part2, int style) {
+static struct rx_st *sum_rx (struct graph_parms *these) {
    static struct {
       const char *part1, *part2, *style;
    } gtab[] = {
@@ -6141,30 +6158,30 @@ static struct rx_st *sum_rx (long total, long part1, long part2, int style) {
    };
    static __thread struct rx_st rx;
    char buf1[SMLBUFSIZ], buf2[SMLBUFSIZ], buf3[MEDBUFSIZ];
-   int num1, num2, width;
+   int ix, num1, num2, width;
    float scale;
 
-   scale = 100.0 / total;
-   rx.pcnt_one = scale * part1;
-   rx.pcnt_two = scale * part2;
+   scale = 100.0 / these->total;
+   rx.pcnt_one = scale * these->part1;
+   rx.pcnt_two = scale * these->part2;
    if (rx.pcnt_one + rx.pcnt_two > 100.0 || rx.pcnt_two < 0)
       rx.pcnt_two = 0;
    rx.pcnt_tot = rx.pcnt_one + rx.pcnt_two;
 
-   num1 = (int)((rx.pcnt_one * Graph_adj) + .5),
-   num2 = (int)((rx.pcnt_two * Graph_adj) + .5);
-   if (num1 + num2 > Graph_len)
-      num2 = Graph_len - num1;
+   num1 = (int)((rx.pcnt_one * these->adjust) + .5),
+   num2 = (int)((rx.pcnt_two * these->adjust) + .5);
+   if (num1 + num2 > these->length)
+      num2 = these->length - num1;
 
-   width = Graph_len;
+   width = these->length;
    buf1[0] = buf2[0] = buf3[0] = '\0';
-   --style;    // now relative to zero
+   ix = these->style - 1;     // now relative to zero
    if (num1) {
-      snprintf(buf1, sizeof(buf1), gtab[style].part1, num1, gtab[style].style);
+      snprintf(buf1, sizeof(buf1), gtab[ix].part1, num1, gtab[ix].style);
       width += 2;
    }
    if (num2) {
-      snprintf(buf2, sizeof(buf2), gtab[style].part2, num2, gtab[style].style);
+      snprintf(buf2, sizeof(buf2), gtab[ix].part2, num2, gtab[ix].style);
       width += 2;
    }
    snprintf(buf3, sizeof(buf3), "%s%s", buf1, buf2);
@@ -6223,7 +6240,10 @@ static int sum_tics (struct stat_stack *this, const char *pfx, int nobuf) {
    /* display some kinda' cpu state percentages
       (who or what is explained by the passed prefix) */
    if (Curwin->rc.graph_cpus) {
-      rx = sum_rx(tot_frme, rSv(stat_SUM_USR), rSv(stat_SUM_SYS), Curwin->rc.graph_cpus);
+      Graph_cpus->total = tot_frme;
+      Graph_cpus->part1 = rSv(stat_SUM_USR);
+      Graph_cpus->part2 = rSv(stat_SUM_SYS);
+      rx = sum_rx(Graph_cpus);
       if (Curwin->rc.double_up > 1)
          return sum_see(fmtmk("%s~3%3.0f%s", pfx, rx->pcnt_tot, rx->graph), nobuf);
       else {
@@ -6434,27 +6454,23 @@ static void do_memory (void) {
       my_misc = MEM_VAL(mem_TOT) - MEM_VAL(mem_FRE) - my_qued;
       my_used = MEM_VAL(mem_TOT) - MEM_VAL(mem_AVL) - my_misc;
 
-      rx = sum_rx(MEM_VAL(mem_TOT), my_misc, my_used, Curwin->rc.graph_mems);
-      if (Curwin->rc.double_up > 1)
-         snprintf(row, sizeof(row), "%s %s~3%3.0f%s"
-            , scT(label), N_txt(WORD_abv_mem_txt), rx->pcnt_tot, rx->graph);
-      else {
-         prT(bfT(0), mkM(MEM_VAL(mem_TOT)));
-         snprintf(row, sizeof(row), "%s %s:~3%#5.1f~2/%-9.9s~3%s"
-            , scT(label), N_txt(WORD_abv_mem_txt), rx->pcnt_tot, bfT(0)
-            , rx->graph);
-      }
+      Graph_mems->total = MEM_VAL(mem_TOT);
+      Graph_mems->part1 = my_misc;
+      Graph_mems->part2 = my_used;
+      rx = sum_rx(Graph_mems);
+      prT(bfT(0), mkM(MEM_VAL(mem_TOT)));
+      snprintf(row, sizeof(row), "%s %s:~3%#5.1f~2/%-9.9s~3%s"
+         , scT(label), N_txt(WORD_abv_mem_txt), rx->pcnt_tot, bfT(0)
+         , rx->graph);
       Msg_row += sum_see(row, mem2UP);
 
-      rx = sum_rx(MEM_VAL(swp_TOT), 0, MEM_VAL(swp_USE), Curwin->rc.graph_mems);
-      if (Curwin->rc.double_up > 1)
-         snprintf(row, sizeof(row), "%s %s~3%3.0f%s"
-            , scT(label), N_txt(WORD_abv_swp_txt), rx->pcnt_tot, rx->graph);
-      else {
-         prT(bfT(1), mkM(MEM_VAL(swp_TOT)));
-         snprintf(row, sizeof(row), "%s %s:~3%#5.1f~2/%-9.9s~3%s"
-            , scT(label), N_txt(WORD_abv_swp_txt), rx->pcnt_two, bfT(1), rx->graph);
-      }
+      Graph_mems->total = MEM_VAL(swp_TOT);
+      Graph_mems->part1 = 0;
+      Graph_mems->part2 = MEM_VAL(swp_USE);
+      rx = sum_rx(Graph_mems);
+      prT(bfT(1), mkM(MEM_VAL(swp_TOT)));
+      snprintf(row, sizeof(row), "%s %s:~3%#5.1f~2/%-9.9s~3%s"
+         , scT(label), N_txt(WORD_abv_swp_txt), rx->pcnt_two, bfT(1), rx->graph);
       Msg_row += sum_see(row, 1);
 
    } else {
diff --git a/src/top/top.h b/src/top/top.h
index d3427fe..3619ed6 100644
--- a/src/top/top.h
+++ b/src/top/top.h
@@ -760,7 +760,7 @@ typedef struct WIN_t {
 //atic void          keys_window (int ch);
 //atic void          keys_xtra (int ch);
 /*------  Tertiary summary display support (summary_show helpers)  -------*/
-//atic struct rx_st *sum_rx (long total, long part1, long part2, int style);
+//atic struct rx_st *sum_rx (struct graph_parms *these);
 //atic inline int    sum_see (const char *str, int nobuf);
 //atic int           sum_tics (struct stat_stack *this, const char *pfx, int nobuf);
 //atic int           sum_unify (struct stat_stack *this, int nobuf);