Function NFromPch

xgeneral.cpp:1979–1989

// motion vector quantities from draw strings, e.g. the "12" in "U12".

int NFromPch(CONST char **ppch)
{
  int n = 0, ich = 0;

  loop {
    if (!FNumCh(**ppch))
      return n > 0 ? n : (ich < 1 ? 1 : 0);
    n = n*10 + (**ppch)-'0';
    (*ppch)++;
    ich++;
  }
}