stdlib.h alternative in Linux kernel?

Question

When developing a kernel module in Linux, using the C standard library isn\'t allowed.
However, in case I need to use some common functionality like strcat()

Answer 1

Sorry @eq - thinking of another function.

Why not

void (char *d, const char *s);
{
   if (*d)
   { 
       for (; *d; ++d) {} ;
      --d;
   }
   strcpy(d, s);
}

I could do strcpy if you wish