Create reader.c and reader.h

Add proc_stat struct
Add the reading from /proc/stat

Author: zielinsky

.gitignore

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+a.out
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/settings.json

reader.c

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+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "reader.h"
+
+int main() {
+    FILE* file = fopen("/proc/stat", "r");
+    char line[1024];
+    struct proc_stat* stats = NULL;
+    int thread_count = 0;
+    int capacity = 0;
+
+    while (fgets(line, sizeof(line), file)) {
+        if (strncmp(line, "cpu", 3) == 0) {
+            if (thread_count == capacity) {
+                capacity = capacity == 0 ? 1 : capacity * 2;
+                struct proc_stat* temp = realloc(stats, capacity * sizeof(struct proc_stat));
+                if(temp == NULL) {
+                    perror("Error reallocating memory");
+                    free(stats);
+                    fclose(file);
+                    return 1;
+                }
+                stats = temp;
+            }
+            sscanf(line, "%s %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu", stats[thread_count].name, &stats[thread_count].user, &stats[thread_count].nice, &stats[thread_count].system, &stats[thread_count].idle, &stats[thread_count].iowait, &stats[thread_count].irq, &stats[thread_count].softirq, &stats[thread_count].steal, &stats[thread_count].guest, &stats[thread_count].guest_nice);
+            thread_count++;
+        }else{
+            break;
+        }
+    }
+
+    for (int i = 0; i < thread_count; i++) {
+        printf("%s %lu %lu %lu %lu %lu %lu %lu %lu %lu\n", stats[i].name, stats[i].user, stats[i].nice, stats[i].system, stats[i].idle, stats[i].iowait, stats[i].irq, stats[i].softirq, stats[i].steal, stats[i].guest, stats[i].guest_nice);
+    }
+
+    free(stats);
+    fclose(file);
+    return 0;
+}

reader.h

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+
+struct proc_stat {
+    char name[256];
+    unsigned long user, nice, system, idle, iowait, irq, softirq, steal, guest, guest_nice;
+};