/*
** strncmp(s,t,n) - Compares two strings for at most n
**                  characters and returns an integer
**                  >0, =0, <0 as s is >t, =t, or <t.
*/
strncmp(s, t, n) char *s, *t; int n; {
  while(n && *s==*t) {
    if(*s == 0) return (0);
    ++s; ++t; --n;
    }
  if(n) return (*s - *t);
  return (0);
  }