CpuUsage: support JSON config

src/detection/cpuusage/cpuusage_linux.c

@@ -0,0 +1,32 @@
+#include "fastfetch.h"
+#include "detection/cpuusage/cpuusage.h"
+
+#include <stdio.h>
+#include <inttypes.h>
+
+const char* ffGetCpuUsageInfo(uint64_t* inUseAll, uint64_t* totalAll)
+{
+    uint64_t user = 0, nice = 0, system = 0, idle = 0, iowait = 0, irq = 0, softirq = 0;
+
+    FILE* procStat = fopen("/proc/stat", "r");
+    if(procStat == NULL)
+    {
+        #ifdef __ANDROID__
+        return "Accessing \"/proc/stat\" is restricted on Android O+";
+        #else
+        return "fopen(\"""/proc/stat\", \"r\") == NULL";
+        #endif
+    }
+
+    if (fscanf(procStat, "cpu%" PRIu64 "%" PRIu64 "%" PRIu64 "%" PRIu64 "%" PRIu64 "%" PRIu64 "%" PRIu64, &user, &nice, &system, &idle, &iowait, &irq, &softirq) < 0)
+    {
+        fclose(procStat);
+        return "fscanf() failed";
+    }
+    *inUseAll = user + nice + system;
+    *totalAll = *inUseAll + idle + iowait + irq + softirq;
+
+    fclose(procStat);
+
+    return NULL;
+}