/*
** itox -- converts nbr to hex string of length sz
**         right adjusted and blank filled, returns str
**
**        if sz > 0 terminate with null byte
**        if sz = 0 find end of string
**        if sz < 0 use last byte for data
*/
itox(nbr, str, sz)  int nbr;  char str[];  int sz;  {
  int digit, offset;
  if(sz>0) str[--sz]=0;
  else if(sz<0) sz = -sz;
  else while(str[sz]!=0) ++sz;
  while(sz) {
    digit=nbr&15; nbr=(nbr>>4)&4095;
    if(digit<10) offset=48; else offset=55;
    str[--sz]=digit+offset;
    if(nbr==0) break;
    }
  while(sz) str[--sz]=' ';
  return str;
  }
