Comments

The /*- sequence means "Don't format"

Java /** comments are read by javadoc

FALTRHOUGH comments mark continued case statements:

    case 10:                /* yy */
        lt->tm_year = ATOI2(p);
        if (lt->tm_year < 69)       /* hack for 2000 ;-} */
            lt->tm_year += 100;
        /* FALLTHROUGH */
    case 8:                 /* mm */
        lt->tm_mon = ATOI2(p);

NOTREACHED mark non-reachable code points

size_t
strcspn(const char *s1, const char *s2)
{
    register const char *p, *spanp;
    register char c, sc;

    /*
     * Stop as soon as we find any character from s2.  Note
     * that there must be a NUL in s2; it suffices to stop
     * when we find that, too.
     */
    for (p = s1;;) {
        c = *p++;
        spanp = s2;
        do {
            if ((sc = *spanp++) == c)
                return (p - 1 - s1);
        } while (sc != 0);
    }
    /* NOTREACHED */
}

$Identifier$ sequences are expanded by the VCS

XXX means something is probably wrong here

TODO marks areas of further work

FIXME marks areas of further enhancement