made script to write function pointer to char and convert it back to a...

made script to write function pointer to char and convert it back to a function pointer in a different function

casting_pointer/compile.sh

+# Compile a shared library
+#gcc -shared -o libmean.so.1 -fPIC mean.c
+gcc -o main -fPIC main.c

casting_pointer/main.c

+#include <stdio.h>
+#include <stddef.h>
+
+typedef int (*fn_def)(void);
+
+int test1()
+{
+    // function to call
+    printf("Test\n");
+}
+
+void convert_and_call(void *fnvptr_val)
+{
+    // convert into pointer
+    fn_def fnptr = (fn_def)fnvptr_val;
+    fnptr();    
+}
+
+
+int main()
+{
+    void* fnvptr = (void*)&test1;
+
+
+    // print adress 
+    printf("%p\n", &test1);
+
+    // cast into char array
+    char* a=(char*)fnvptr;
+
+    // print stuff
+    printf("%s\n", a);
+    printf("size: %ld\n",sizeof(a));
+
+    // cast into new void thing
+    void * fnvptr2 = (void*)a;
+    printf("%p\n", fnvptr2);
+
+    // // convert into pointer
+    convert_and_call(fnvptr2);
+}