Load TAR archive + run raw user program

src/string/string.c

@@ -98,4 +98,12 @@ int strncmp(const char* s1, const char* s2, size_t n)
     else {
         return ( *(unsigned char *)s1 - *(unsigned char *)s2 );
     }
+}
+
+// BSD implementation
+size_t strlen(const char* str)
+{
+        const char* s;
+        for (s = str; *s; ++s);
+        return (s - str);
 }