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What i can think of is such an API would be copying data from src to target location in units of byte size each ( I mean one byte at a time).

Since it can work for any type of data the signature should be that of a void pointer. Now it seems trivial. (ofcourse to keep validations in place we should be aware of what memcpy does, what does it return etc..)

Anyone with any distinguishable ideas/facts.

Go wrong because src and dst overlap?

What if the memory regions overlapped?

Use memmove during overlap ... it will ensure that destination has proper content at the end of copy but src can be garbled

//Not exactly ideal, for overlapping src and dest, memmove() is always safer
int mymemcpy(void *dest, void *src, int nbytes)
{
      int i;
      if(dest==src) return 0;
      if(src>dest)
            for(i=nbytes-1; i>=0; i--) dest[i] = src[i];
      else
            for(i=0; i<nbytes; i++) dest[i] = src[i];
}