boolprev_art_with_subj(){    register ARTICLE *ap = artp, *ap2;    register SUBJECT *sp;    bool try_this_subj_again = TRUE;    if (!ap)	return FALSE;    sp = ap->subj;    do {	ap2 = ap->subj->articles;	if (ap2 == ap)	    ap = Nullart;	else {	    while (ap2 && ap2->subj_next != ap)		ap2 = ap2->subj_next;	    ap = ap2;	}	if (!ap) {	    if (try_this_subj_again) {		ap = sp->articles;		while (ap->subj_next)		    ap = ap->subj_next;		try_this_subj_again = FALSE;	    } else {		if (!art)		    art = lastart;		return FALSE;	    }	}    } while ((ap->flags & (AF_READ|AF_MISSING))	  || (selected_only && !(ap->flags & AF_SEL)));    artp = ap;    art = article_num(ap);    return TRUE;}/* Select a single article.*/voidselect_article(ap, sel_flags)register ARTICLE *ap;int sel_flags;{    int desired_flags = (sel_rereading? AF_READ : 0);#ifdef VERBOSE    bool echo;    if (sel_flags & AF_ECHO) {	echo = TRUE;	sel_flags &= ~AF_ECHO;    } else	echo = FALSE;#else    sel_flags &= ~AF_ECHO;#endif    if (sel_flags & (AF_AUTOSELECT|AF_AUTOSELECTALL))	save_ids = TRUE;    if ((ap->flags & (AF_MISSING|AF_READ)) == desired_flags) {	if (!(ap->flags & sel_mask)) {	    selected_count++;#ifdef VERBOSE	    if (echo) {		IF(verbose)		    fputs("\tSelected",stdout);	    }#endif	}	ap->flags = (ap->flags & ~AF_DEL) | sel_mask | sel_flags;    } else	ap->flags |= sel_flags;    if (!(ap->subj->flags & sel_mask))	selected_subj_cnt++;    ap->subj->flags = (ap->subj->flags&~SF_DEL)|sel_mask|sel_flags|SF_VISIT;    if (sel_mode == SM_THREAD) {	if ((ap = ap->subj->thread) != NULL)	    ap->subj->flags |= SF_VISIT;    }    selected_only = (selected_only || selected_count != 0);}/* Select all the articles in a subject.*/voidselect_subject(subj, sel_flags)SUBJECT *subj;int sel_flags;{    register ARTICLE *ap;    int desired_flags = (sel_rereading? AF_READ : 0);    int old_count = selected_count;    if (sel_flags & (AF_AUTOSELECT|AF_AUTOSELECTALL)) {	save_ids = TRUE;	if (sel_flags & AF_AUTOSELECTALL)	    subj->flags |= SF_AUTOSELECT;    }    for (ap = subj->articles; ap; ap = ap->subj_next) {	if ((ap->flags & (AF_MISSING|AF_READ|sel_mask)) == desired_flags) {	    ap->flags |= sel_mask | sel_flags;	    selected_count++;	} else	    ap->flags |= sel_flags;    }    if (selected_count > old_count) {	if (!(subj->flags & sel_mask))	    selected_subj_cnt++;	subj->flags = (subj->flags & ~SF_DEL)		    | sel_mask | SF_VISIT | SF_WASSELECTED;	if (sel_mode == SM_THREAD) {	    if ((ap = subj->thread) != NULL)		ap->subj->flags |= SF_VISIT;	}	selected_only = TRUE;    } else	subj->flags |= SF_WASSELECTED;}/* Select all the articles in a thread.*/voidselect_thread(thread, sel_flags)register ARTICLE *thread;int sel_flags;{    register SUBJECT *sp;    sp = thread->subj;    do {	select_subject(sp, sel_flags);	sp = sp->thread_link;    } while (sp != thread->subj);}/* Select the subthread attached to this article.*/voidselect_subthread(ap, sel_flags)register ARTICLE *ap;int sel_flags;{    register ARTICLE *limit;    SUBJECT *subj;    int desired_flags = (sel_rereading? AF_READ : 0);    int old_count = selected_count;    if (!ap)	return;    subj = ap->subj;    for (limit = ap; limit; limit = limit->parent) {	if (limit->sibling) {	    limit = limit->sibling;	    break;	}    }    if (sel_flags & (AF_AUTOSELECT|AF_AUTOSELECTALL))	save_ids = TRUE;    for (; ap != limit; ap = bump_art(ap)) {	if ((ap->flags & (AF_MISSING|AF_READ|sel_mask)) == desired_flags) {	    ap->flags |= sel_mask | sel_flags;	    selected_count++;	} else	    ap->flags |= sel_flags;    }    if (selected_count > old_count) {	if (!(subj->flags & sel_mask))	    selected_subj_cnt++;	subj->flags = (subj->flags & ~SF_DEL) | sel_mask | SF_VISIT;	if (sel_mode == SM_THREAD) {	    if ((ap = subj->thread) != NULL)		ap->subj->flags |= SF_VISIT;	}	selected_only = TRUE;    }}/* Deselect a single article.*/voiddeselect_article(ap)register ARTICLE *ap;{    if (ap->flags & sel_mask) {	ap->flags &= ~sel_mask;	if (!selected_count--)	    selected_count = 0;#ifdef VERBOSE	if (mode != 't') {	    IF(verbose)		fputs("\tDeselected",stdout);	}#endif    }    if (sel_rereading && sel_mode == SM_ARTICLE)	ap->flags |= AF_DEL;}/* Deselect all the articles in a subject.*/voiddeselect_subject(subj)SUBJECT *subj;{    register ARTICLE *ap;    for (ap = subj->articles; ap; ap = ap->subj_next) {	if (ap->flags & sel_mask) {	    ap->flags &= ~sel_mask;	    if (!selected_count--)		selected_count = 0;	}    }    if (subj->flags & sel_mask) {	subj->flags &= ~sel_mask;	selected_subj_cnt--;    }    subj->flags &= ~(SF_VISIT | SF_WASSELECTED);    if (sel_rereading)	subj->flags |= SF_DEL;    else	subj->flags &= ~SF_DEL;}/* Deselect all the articles in a thread.*/voiddeselect_thread(thread)register ARTICLE *thread;{    register SUBJECT *sp;    sp = thread->subj;    do {	deselect_subject(sp);	sp = sp->thread_link;    } while (sp != thread->subj);}/* Deselect everything.*/voiddeselect_all(){    register SUBJECT *sp;    for (sp = first_subject; sp; sp = sp->next)	deselect_subject(sp);    selected_count = selected_subj_cnt = 0;    sel_page_sp = 0;    sel_page_app = 0;    sel_last_ap = 0;    sel_last_sp = 0;    selected_only = FALSE;}/* Kill all unread articles attached to the given subject.*/voidkill_subject(subj, kill_flags)SUBJECT *subj;int kill_flags;{    register ARTICLE *ap;    register int killmask = ((kill_flags&KF_ALL)? AF_READ:(AF_READ|sel_mask));    if (kill_flags & KF_KILLFILE) {	save_ids = TRUE;	kill_flags = AF_AUTOKILLALL;    } else	kill_flags = 0;    for (ap = subj->articles; ap; ap = ap->subj_next) {	if (!(ap->flags & killmask))	    set_read(ap);	ap->flags |= kill_flags;    }    subj->flags &= ~(SF_VISIT | SF_WASSELECTED);}/* Kill all unread articles attached to the given thread.*/voidkill_thread(thread, kill_flags)register ARTICLE *thread;int kill_flags;{    register SUBJECT *sp;    sp = thread->subj;    do {	kill_subject(sp, kill_flags);	sp = sp->thread_link;    } while (sp != thread->subj);}/* Kill the subthread attached to this article.*/voidkill_subthread(ap, kill_flags)register ARTICLE *ap;int kill_flags;{    register ARTICLE *limit;    if (!ap)	return;    for (limit = ap; limit; limit = limit->parent) {	if (limit->sibling) {	    limit = limit->sibling;	    break;	}    }    if (kill_flags & KF_KILLFILE) {	save_ids = TRUE;	kill_flags = AF_AUTOKILL;    } else	kill_flags = 0;    for (; ap != limit; ap = bump_art(ap)) {	if (!(ap->flags & (AF_READ|AF_MISSING)))	    set_read(ap);	ap->flags |= kill_flags;    }}/* Unkill all the articles attached to the given subject.*/voidunkill_subject(subj)SUBJECT *subj;{    register ARTICLE *ap;    for (ap = subj->articles; ap; ap = ap->subj_next) {	if (sel_rereading) {	    if ((ap->flags & (AF_DELSEL|AF_MISSING)) == AF_DELSEL) {		if (ap->flags & AF_READ)		    toread[ng]++;		ap->flags = (ap->flags & ~(AF_DELSEL|AF_READ)) | AF_SEL;	    } else		ap->flags &= ~(AF_DEL|AF_DELSEL);	} else {	    if ((ap->flags & (AF_READ|AF_MISSING)) == AF_READ)		onemore(ap);	    if (selected_only && !(ap->flags & (AF_SEL|AF_READ))) {		ap->flags = (ap->flags & ~AF_DEL) | AF_SEL;		selected_count++;	    }	}    }    if (!sel_rereading && selected_only && !(subj->flags & SF_SEL)) {	subj->flags |= SF_SEL | SF_VISIT | SF_WASSELECTED;	if (sel_mode == SM_THREAD) {	    if ((ap = subj->thread) != NULL)		ap->subj->flags |= SF_VISIT;	}	selected_subj_cnt++;    }    subj->flags &= ~(SF_DEL|SF_DELSEL);}/* Unkill all the articles attached to the given thread.*/voidunkill_thread(thread)register ARTICLE *thread;{    register SUBJECT *sp;    sp = thread->subj;    do {	unkill_subject(sp);	sp = sp->thread_link;    } while (sp != thread->subj);}/* Unkill the subthread attached to this article.*/voidunkill_subthread(ap)register ARTICLE *ap;{    register ARTICLE *limit;    register SUBJECT *sp;    if (!ap)	return;    for (limit = ap; limit; limit = limit->parent) {	if (limit->sibling) {	    limit = limit->sibling;	    break;	}    }    sp = ap->subj;    for (; ap != limit; ap = bump_art(ap)) {	if ((ap->flags & (AF_READ|AF_MISSING)) == AF_READ)	    onemore(ap);	if (selected_only && !(ap->flags & AF_SEL)) {	    ap->flags |= AF_SEL;	    selected_count++;	}    }    if (!(sp->flags & sel_mask))	selected_subj_cnt++;    sp->flags = (sp->flags & ~SF_DEL) | SF_SEL | SF_VISIT;    if (sel_mode == SM_THREAD) {	if ((ap = sp->thread) != NULL)	    ap->subj->flags |= SF_VISIT;    }    selected_only = (selected_only || selected_count != 0);}/* Kill all unread articles attached to the given subject.*/voidclear_subject(subj)SUBJECT *subj;{    register ARTICLE *ap;    for (ap = subj->articles; ap; ap = ap->subj_next) {	ap->flags &= ~AF_AUTOFLAGS;    }    subj->flags &= ~(SF_WASSELECTED | SF_AUTOSELECT);}/* Kill all unread articles attached to the given thread.*/voidclear_thread(thread)register ARTICLE *thread;{    register SUBJECT *sp;    sp = thread->subj;    do {	clear_subject(sp);	sp = sp->thread_link;    } while (sp != thread->subj);}/* Kill the subthread attached to this article.*/voidclear_subthread(ap)register ARTICLE *ap;{    register ARTICLE *limit;    if (!ap)	return;    for (limit = ap; limit; limit = limit->parent) {	if (limit->sibling) {	    limit = limit->sibling;	    break;	}    }    for (; ap != limit; ap = bump_art(ap)) {	ap->flags &= ~AF_AUTOFLAGS;    }}ARTICLE *subj_art(sp)SUBJECT *sp;{    register ARTICLE *ap = Nullart;    int art_mask = (selected_only? AF_SEL : 0);    bool TG_save = ThreadedGroup;    ThreadedGroup = (sel_mode == SM_THREAD);    ap = first_art(sp);    while (ap && (ap->flags & (art_mask|AF_READ)) != art_mask)	ap = next_art(ap);    if (!ap) {	reread = TRUE;	ap = first_art(sp);	if (art_mask) {	    while (ap && !(ap->flags & AF_SEL))		ap = next_art(ap);	    if (!ap)		ap = first_art(sp);	}    }    ThreadedGroup = TG_save;    return ap;}/* Find the next thread (first if art > lastart).  If articles are selected,** only choose from threads with selected articles.*/voidnext_subject(){    register SUBJECT *sp;    register ARTICLE *ap;    sp = ((ap = artp) ? ap->subj->next : first_subject);    for (; sp; sp = sp->next) {	if (sp->flags & SF_VISIT) {	    if ((ap = subj_art(sp)) != Nullart) {		art = article_num(ap);		artp = ap;		return;	    }