int esc = 0;
int esc;
next_cat(s)	register char *	s;{	int esc = 0;	for (;;)		switch (*s++) {		case '\0':			return (NULL);		case '\\':			esc = 1;			break;		case ':':			if (!esc)				return (s);		default:			esc = 0;			break;		}	/* NOTREACHED */}