#include stdio.h
/*
** utoi -- convert unsigned decimal string to integer nbr
** Returns field size if successful, else ERR.
*/
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;
  }