Add CPU use to display.c
diff --git a/display.c b/display.c
index e1b2005..f36397f 100644
--- a/display.c
+++ b/display.c
@@ -26,11 +26,11 @@
 #include "common.h"
 #include "display.h"
 
+#include <inttypes.h>
 #include <string.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <unistd.h>
-#include <inttypes.h>
 
 #include "log.h"
 #include "util.h"
@@ -66,27 +66,55 @@
     }
 }
 
+static double getCpuUse()
+{
+    static uint64_t prevUserT = 0UL;
+    static uint64_t prevSystemT = 0UL;
+
+    FILE *f = fopen("/proc/stat", "r");
+    if (f == NULL) {
+
+    }
+    defer {
+        fclose(f);
+    };
+    uint64_t userT, niceT, systemT, idleT;
+    if (fscanf(f, "cpu  %" PRIu64 "%" PRIu64 "%" PRIu64 "%" PRIu64, &userT, &niceT, &systemT, &idleT) != 4) {
+        LOG_W("fscanf('/proc/stat') != 4");
+        return 0U;
+    }
+
+    if (prevUserT == 0UL || prevSystemT == 0UL) {
+        prevUserT = userT;
+        prevSystemT = systemT;
+        return 0U;
+    }
+
+    double cpuUse = (double)(((systemT - prevSystemT) + (userT - prevUserT))) / sysconf(_SC_CLK_TCK);
+    prevUserT = userT;
+    prevSystemT = systemT;
+    return cpuUse * 100;
+}
+
 static void display_displayLocked(honggfuzz_t * hfuzz)
 {
     unsigned long elapsed_second = (unsigned long)(time(NULL) - hfuzz->timeStart);
-
     unsigned int day, hour, min, second;
     char time_elapsed_str[64];
-
     if (elapsed_second < 24 * 3600) {
         hour = elapsed_second / 3600;
         min = (elapsed_second - 3600 * hour) / 60;
         second = elapsed_second - hour * 3600 - min * 60;
-        snprintf(time_elapsed_str, sizeof(time_elapsed_str), "%u hrs %u min %u sec", hour, min,
-                 second);
+        snprintf(time_elapsed_str, sizeof(time_elapsed_str), "%u hrs %u min %u sec", hour,
+                 min, second);
     } else {
         day = elapsed_second / 24 / 3600;
         elapsed_second = elapsed_second - day * 24 * 3600;
         hour = elapsed_second / 3600;
         min = (elapsed_second - 3600 * hour) / 60;
         second = elapsed_second - hour * 3600 - min * 60;
-        snprintf(time_elapsed_str, sizeof(time_elapsed_str), "%u days %u hrs %u min %u sec", day,
-                 hour, min, second);
+        snprintf(time_elapsed_str, sizeof(time_elapsed_str),
+                 "%u days %u hrs %u min %u sec", day, hour, min, second);
     }
 
     size_t curr_exec_cnt = ATOMIC_GET(hfuzz->mutationsCnt);
@@ -107,37 +135,37 @@
     static size_t prev_exec_cnt = 0UL;
     uintptr_t exec_per_sec = curr_exec_cnt - prev_exec_cnt;
     prev_exec_cnt = curr_exec_cnt;
-
     MX_SCOPED_LOCK(logMutexGet());
-
     display_put("%s", ESC_CLEAR);
     display_put("==================================== STAT ====================================\n");
-
     display_put("Iterations: " ESC_BOLD "%" _HF_MONETARY_MOD "zu" ESC_RESET, curr_exec_cnt);
     display_printKMG(curr_exec_cnt);
     if (hfuzz->mutationsMax) {
-        display_put(" (out of: " ESC_BOLD "%zu" ESC_RESET " [" ESC_BOLD "%.2f%%" ESC_RESET "])",
-                    hfuzz->mutationsMax, exeProgress);
+        display_put(" (out of: " ESC_BOLD "%zu" ESC_RESET " [" ESC_BOLD "%.2f%%" ESC_RESET
+                    "])", hfuzz->mutationsMax, exeProgress);
     }
     display_put("\n");
-
     char start_time_str[128];
     util_getLocalTime("%F %T", start_time_str, sizeof(start_time_str), hfuzz->timeStart);
-    display_put("Run time: " ESC_BOLD "%s" ESC_RESET " (since: " ESC_BOLD "%s" ESC_RESET ")\n",
-                time_elapsed_str, start_time_str);
-
+    display_put("Run time: " ESC_BOLD "%s" ESC_RESET " (since: " ESC_BOLD "%s" ESC_RESET
+                ")\n", time_elapsed_str, start_time_str);
     display_put("Input file/dir: '" ESC_BOLD "%s" ESC_RESET "'\n", hfuzz->inputFile);
     display_put("Fuzzed cmd: '" ESC_BOLD "%s" ESC_RESET "'\n", hfuzz->cmdline_txt);
     if (hfuzz->linux.pid > 0) {
-        display_put("Remote cmd [" ESC_BOLD "%d" ESC_RESET "]: '" ESC_BOLD "%s" ESC_RESET "'\n",
-                    hfuzz->linux.pid, hfuzz->linux.pidCmd);
+        display_put("Remote cmd [" ESC_BOLD "%d" ESC_RESET "]: '" ESC_BOLD "%s" ESC_RESET
+                    "'\n", hfuzz->linux.pid, hfuzz->linux.pidCmd);
     }
 
-    display_put("Fuzzing threads: " ESC_BOLD "%zu" ESC_RESET "\n", hfuzz->threadsMax);
-    display_put("%s per second: " ESC_BOLD "% " _HF_MONETARY_MOD "zu" ESC_RESET " (avg: " ESC_BOLD
-                "%" _HF_MONETARY_MOD "zu" ESC_RESET ")\n", hfuzz->persistent ? "Rounds" : "Execs",
-                exec_per_sec, elapsed_second ? (curr_exec_cnt / elapsed_second) : 0);
+    display_put("Fuzzing threads: " ESC_BOLD "%zu" ESC_RESET, hfuzz->threadsMax);
+    double cpuUse = getCpuUse();
+    if (cpuUse != 0.0l) {
+        display_put("  (CPU: " ESC_BOLD "%.1lf%%" ESC_RESET ")", cpuUse);
+    }
 
+    display_put("\n%s per second: " ESC_BOLD "% " _HF_MONETARY_MOD "zu" ESC_RESET
+                " (avg: " ESC_BOLD "%" _HF_MONETARY_MOD "zu" ESC_RESET ")\n",
+                hfuzz->persistent ? "Rounds" : "Execs", exec_per_sec,
+                elapsed_second ? (curr_exec_cnt / elapsed_second) : 0);
     /* If dry run, print also the input file count */
     if (hfuzz->origFlipRate == 0.0L && hfuzz->useVerifier) {
         display_put("Input Files: '" ESC_BOLD "%" _HF_MONETARY_MOD "zu" ESC_RESET "'\n",
@@ -146,15 +174,15 @@
 
     uint64_t crashesCnt = ATOMIC_GET(hfuzz->crashesCnt);
     /* colored the crash count as red when exist crash */
-    display_put("Crashes: " ESC_BOLD "%s" "%zu" ESC_RESET " (unique: %s" ESC_BOLD "%zu" ESC_RESET
-                ", blacklist: " ESC_BOLD "%zu" ESC_RESET ", verified: " ESC_BOLD "%zu" ESC_RESET
-                ")\n", crashesCnt > 0 ? ESC_RED : "", hfuzz->crashesCnt,
-                crashesCnt > 0 ? ESC_RED : "", ATOMIC_GET(hfuzz->uniqueCrashesCnt),
-                ATOMIC_GET(hfuzz->blCrashesCnt), ATOMIC_GET(hfuzz->verifiedCrashesCnt));
-
-    display_put("Timeouts (%" _HF_MONETARY_MOD "zu sec): " ESC_BOLD "%" _HF_MONETARY_MOD "zu"
-                ESC_RESET "\n", hfuzz->tmOut, ATOMIC_GET(hfuzz->timeoutedCnt));
-
+    display_put("Crashes: " ESC_BOLD "%s" "%zu" ESC_RESET " (unique: %s" ESC_BOLD "%zu"
+                ESC_RESET ", blacklist: " ESC_BOLD "%zu" ESC_RESET ", verified: "
+                ESC_BOLD "%zu" ESC_RESET ")\n", crashesCnt > 0 ? ESC_RED : "",
+                hfuzz->crashesCnt, crashesCnt > 0 ? ESC_RED : "",
+                ATOMIC_GET(hfuzz->uniqueCrashesCnt), ATOMIC_GET(hfuzz->blCrashesCnt),
+                ATOMIC_GET(hfuzz->verifiedCrashesCnt));
+    display_put("Timeouts (%" _HF_MONETARY_MOD "zu sec): " ESC_BOLD "%"
+                _HF_MONETARY_MOD "zu" ESC_RESET "\n", hfuzz->tmOut,
+                ATOMIC_GET(hfuzz->timeoutedCnt));
     /* Feedback data sources are enabled. Start with common headers. */
     if (hfuzz->dynFileMethod != _HF_DYNFILE_NONE || hfuzz->useSanCov) {
         display_put("File corpus size: " ESC_BOLD "%" _HF_MONETARY_MOD "zu" ESC_RESET "\n",
@@ -164,37 +192,37 @@
 
     /* HW perf specific counters */
     if (hfuzz->dynFileMethod & _HF_DYNFILE_INSTR_COUNT) {
-        display_put("  - instructions:    " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET "\n",
-                    ATOMIC_GET(hfuzz->linux.hwCnts.cpuInstrCnt));
+        display_put("  - instructions:    " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    "\n", ATOMIC_GET(hfuzz->linux.hwCnts.cpuInstrCnt));
     }
     if (hfuzz->dynFileMethod & _HF_DYNFILE_BRANCH_COUNT) {
-        display_put("  - branches:        " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET "\n",
-                    ATOMIC_GET(hfuzz->linux.hwCnts.cpuBranchCnt));
+        display_put("  - branches:        " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    "\n", ATOMIC_GET(hfuzz->linux.hwCnts.cpuBranchCnt));
     }
     if (hfuzz->dynFileMethod & _HF_DYNFILE_BTS_BLOCK) {
-        display_put("  - BTS blocks:      " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET "\n",
-                    ATOMIC_GET(hfuzz->linux.hwCnts.bbCnt));
+        display_put("  - BTS blocks:      " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    "\n", ATOMIC_GET(hfuzz->linux.hwCnts.bbCnt));
     }
     if (hfuzz->dynFileMethod & _HF_DYNFILE_BTS_EDGE) {
-        display_put("  - BTS edges:       " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET "\n",
-                    ATOMIC_GET(hfuzz->linux.hwCnts.bbCnt));
+        display_put("  - BTS edges:       " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    "\n", ATOMIC_GET(hfuzz->linux.hwCnts.bbCnt));
     }
     if (hfuzz->dynFileMethod & _HF_DYNFILE_IPT_BLOCK) {
-        display_put("  - PT blocks:       " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET "\n",
-                    ATOMIC_GET(hfuzz->linux.hwCnts.bbCnt));
+        display_put("  - PT blocks:       " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    "\n", ATOMIC_GET(hfuzz->linux.hwCnts.bbCnt));
     }
     if (hfuzz->dynFileMethod & _HF_DYNFILE_CUSTOM) {
-        display_put("  - custom counter:  " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET "\n",
-                    ATOMIC_GET(hfuzz->linux.hwCnts.customCnt));
+        display_put("  - custom counter:  " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    "\n", ATOMIC_GET(hfuzz->linux.hwCnts.customCnt));
     }
 
     if (hfuzz->dynFileMethod & _HF_DYNFILE_SOFT) {
         uint64_t softCnt = ATOMIC_GET(hfuzz->linux.hwCnts.softCnt);
         uint64_t softCntMax = ATOMIC_GET(hfuzz->linux.hwCnts.softCntMax);
         double softCntFrac = (softCntMax != 0) ? ((double)softCnt / softCntMax) : 0.0l;
-        display_put("  - functions seen:  " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET " (max: "
-                    ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET " - %.2lf%%)\n", softCnt,
-                    softCntMax, softCntFrac);
+        display_put("  - functions seen:  " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    " (max: " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    " - %.2lf%%)\n", softCnt, softCntMax, softCntFrac);
     }
 
     /* Sanitizer coverage specific counters */
@@ -208,8 +236,8 @@
                     " (instrumented only)\n", ATOMIC_GET(hfuzz->sanCovCnts.iDsoCnt));
         display_put("  - discovered #bb:  " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
                     " (new from input seed)\n", ATOMIC_GET(hfuzz->sanCovCnts.newBBCnt));
-        display_put("  - crashes:         " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET "\n",
-                    ATOMIC_GET(hfuzz->sanCovCnts.crashesCnt));
+        display_put("  - crashes:         " ESC_BOLD "%" _HF_MONETARY_MOD PRIu64 ESC_RESET
+                    "\n", ATOMIC_GET(hfuzz->sanCovCnts.crashesCnt));
     }
     display_put("==================================== LOGS ====================================\n");
 }