Fix: include cached ram in calculation

Implementierung/src/io.c

@@ -24,6 +24,25 @@ bool open_file(const char* path, FILE** file, struct stat* file_stat) {
   return true;
 }
 
+unsigned long get_available_memory() {
+  FILE* f;
+  struct stat statOfFile;
+  if (!open_file("/proc/meminfo", &f, &statOfFile)) {
+    return 0;
+  }
+
+  char line[100];
+  while (fgets(line, sizeof(line), f)) {
+    unsigned long available_memory;
+    if (sscanf(line, "MemAvailable: %ld kB", &available_memory) == 1) {
+      fclose(f);
+      return available_memory * 1000;
+    }
+  }
+
+  return 0;
+}
+
 uint8_t* read_file(const char* path, size_t* size) {
   // Read the contents of the file specified by path into a heap-allocated
   // buffer and return a pointer to that buffer.
@@ -33,10 +52,9 @@ uint8_t* read_file(const char* path, size_t* size) {
     return NULL;
   }
 
-  struct sysinfo info;
-  int r = sysinfo(&info);
+  unsigned long available_memory = get_available_memory();
 
-  if (r != 0 || info.freeram < (unsigned long)(statOfFile.st_size * 2)) {
+  if (available_memory < (unsigned long)(statOfFile.st_size * 2)) {
     errno = ENOMEM;
     return NULL;
   }