/*
** utoi -- convert unsigned decimal string to integer nbr
**          returns field size, else ERR on error
*/
utoi(decstr, nbr)  char *decstr;  int *nbr;  {
  int d,t; d=0;
  *nbr=0;
  while((*decstr>='0')&(*decstr<='9')) {
    t = *nbr;t=(10*t) + (*decstr++ - '0');
    if ((t>=0)&(*nbr<0)) return ERR;
    d++; *nbr=t;
    }
  return d;
  }