ng.c

早期freebsd实现

#ifdef VERIFY
	printcmd();
#endif
	putchar('\n') FLUSH;
	if (*buf == 'h') {
#ifdef VERBOSE
	    IF(verbose)
	    {
		fputs("\
Type + to enter select thread mode using all the unread articles.\n\
(The selected threads will be marked as unread and displayed as usual.)\n\
",stdout) FLUSH;
		fputs(u_help_thread,stdout);
		fputs("\
Type a to mark all articles in this group as unread.\n\
Type n to change nothing.\n\
",stdout) FLUSH;
	    }
	    ELSE
#endif
#ifdef TERSE
	    {
		fputs("\
+ to select threads from the unread.\n\
",stdout) FLUSH;
		fputs(u_help_thread,stdout);
		fputs("\
a to mark all articles unread.\n\
n to change nothing.\n\
",stdout) FLUSH;
	    }
#endif
	    goto reask_unread;
	}
	else if (*buf == 'n' || *buf == 'q')
	    return AS_ASK;
	else if (*buf == 't' && u_help_thread != nullstr) {
	    unkill_thread(artp->subj->thread);
	    if ((artp = first_art(artp->subj)) != Nullart)
		art = article_num(artp);
	} else if (*buf == 's' && u_help_thread != nullstr)
	    unkill_subthread(artp);
	else if (*buf == 'a') {
	    register ARTICLE *ap;
	    check_first(absfirst);
	    ap = article_ptr(absfirst);
	    for (i = absfirst; i <= lastart; i++, ap++)
		if ((ap->flags & (AF_READ|AF_MISSING)) == AF_READ) {
		    ap->flags &= ~AF_READ;		/* mark as unread */
		    toread[ng]++;
		}
	    count_subjects(CS_NORM);
	}
	else if (*buf == '+') {
	    *buf = 'U';
	    goto run_the_selector;
	}
	else {
	    fputs(hforhelp,stdout) FLUSH;
	    settle_down();
	    goto reask_unread;
	}
	return AS_NORM;
    }
    case '[':			/* goto parent article */
    case '{':			/* goto thread's root article */
	if (artp) {
	    if (!find_parent(*buf == '{')) {
		register char *cp = (*buf=='['?"parent":"root");
#ifdef VERBOSE
		IF(verbose)
		    printf("\nThere is no %s article prior to this one.\n",
			cp) FLUSH;
		ELSE
#endif
#ifdef TERSE
		    printf("\nNo prior %s.\n",cp) FLUSH;
#endif
		return AS_ASK;
	    }
	    reread = TRUE;
	    return AS_NORM;
	}
not_threaded:
	if (ThreadedGroup) {
#ifdef VERBOSE
	    IF(verbose)
		fputs("\nThis article is not threaded.\n",stdout) FLUSH;
	    ELSE
#endif
#ifdef TERSE
		fputs("\nUnthreaded article.\n",stdout) FLUSH;
#endif
	    return AS_ASK;
	}
#ifdef VERBOSE
	IF(verbose)
	    fputs("\nThis group is not threaded.\n",stdout) FLUSH;
	ELSE
#endif
#ifdef TERSE
	    fputs("\nUnthreaded group.\n",stdout) FLUSH;
#endif
	return AS_ASK;
    case ']':			/* goto child article */
    case '}':			/* goto thread's leaf article */
	if (artp) {
	    if (!find_leaf(*buf == '}')) {
#ifdef VERBOSE
		IF(verbose)
		    fputs("\n\
This is the last leaf in this tree.\n",stdout) FLUSH;
		ELSE
#endif
#ifdef TERSE
		    fputs("\nLast leaf.\n",stdout) FLUSH;
#endif
		return AS_ASK;
	    }
	    reread = TRUE;
	    return AS_NORM;
	}
	goto not_threaded;
    case '(':			/* goto previous sibling */
    case ')':			/* goto next sibling */
	if (artp) {
	    if (!(*buf == '(' ? find_prev_sib() : find_next_sib())) {
		register char *cp = (*buf == '(' ? "previous" : "next");
#ifdef VERBOSE
		IF(verbose)
		    printf("\nThis article has no %s sibling.\n",cp) FLUSH;
		ELSE
#endif
#ifdef TERSE
		    printf("\nNo %s sibling.\n",cp) FLUSH;
#endif
		return AS_ASK;
	    }
	    reread = TRUE;
	    return AS_NORM;
	}
	goto not_threaded;
    case 'T':
	if (!ThreadedGroup)
	    goto not_threaded;
	/* FALL THROUGH */
    case 'A':
	if (!artp) {
	    printf("You're not at an article.\n");
	    return AS_ASK;
	}
	switch (ask_memorize(*buf)) {
	case ',':  case 'j':
	    return AS_NORM;
	}
	return AS_ASK;
    case 'K':
	if (!artp) {
	    printf("You're not at an article.\n");
	    return AS_ASK;
	}
	/* first, write kill-subject command */
	(void)art_search(buf, (sizeof buf), TRUE);
	art = curr_art;
	artp = curr_artp;
	kill_subject(artp->subj,KF_ALL);/* take care of any prior subjects */
	return AS_NORM;
    case ',':		/* kill this node and all descendants */
	if (ThreadedGroup)
	    kill_subthread(artp,KF_ALL);
	else if (art >= absfirst && art <= lastart)
	    mark_as_read();
	return AS_NORM;
    case 'J':		/* Junk all nodes in this thread */
	if (ThreadedGroup) {
	    kill_thread(artp->subj->thread,KF_ALL);
	    return AS_NORM;
	}
	/* FALL THROUGH */
    case 'k':		/* kill current subject */
	kill_subject(artp->subj,KF_ALL);
	if (last_cached < lastart) {
	    *buf = 'k';
	    goto normal_search;
	}
	return AS_NORM;
    case 't':
	carriage_return();
#ifndef CLEAREOL
	erase_eol();		/* erase the prompt */
#else
	if (erase_screen && can_home_clear)
	    clear_rest();
	else
	    erase_eol();	/* erase the prompt */
#endif /* CLEAREOL */
	fflush(stdout);
	page_line = 1;
	entire_tree(curr_artp);
	return AS_ASK;
    case ':':			/* execute command on selected articles */
	page_line = 1;
	if (!use_selected())
	    return AS_INP;
	putchar('\n');
	art = curr_art;
	artp = curr_artp;
	return AS_ASK;
    case 'p':			/* find previous unread article */
	do {
	    dec_art(selected_only,FALSE);
	} while (art >= firstart && (was_read(art) || !parseheader(art)));
#ifdef ARTSEARCH
	srchahead = 0;
#endif
	if (art >= firstart)
	    return AS_NORM;
	art = absfirst;	
	/* FALL THROUGH */
    case 'P':		/* goto previous article */
	dec_art(FALSE,TRUE);
      check_dec_art:
	if (art < absfirst) {
#ifdef VERBOSE
	    IF(verbose)
		printf("\nThere are no%s%s articles prior to this one.\n",
			*buf=='P'?nullstr:" unread",
			selected_only?" selected":nullstr) FLUSH;
	    ELSE
#endif
#ifdef TERSE
		printf("\nNo previous%s%s articles\n",
			*buf=='P'?nullstr:" unread",
			selected_only?" selected":nullstr) FLUSH;
#endif
	    art = curr_art;
	    artp = curr_artp;
	    return AS_ASK;
	}
	reread = TRUE;
#ifdef ARTSEARCH
	srchahead = 0;
#endif
	return AS_NORM;
    case '-':
	if (recent_art >= 0) {
	    art = recent_art;
	    artp = recent_artp;
	    reread = TRUE;
	    forcelast = TRUE;
#ifdef ARTSEARCH
	    srchahead = -(srchahead != 0);
#endif
	    return AS_NORM;
	}
	else {
	    exit_code = NG_MINUS;
	    return AS_CLEAN;
	}
    case 'n':		/* find next unread article? */
	if (art > lastart) {
	    if (!toread[ng])
		return AS_CLEAN;
	    top_article();
	}
#ifdef ARTSEARCH
	else if (scanon && !ThreadedGroup && srchahead) {
	    *buf = Ctl('n');
	    if (!next_art_with_subj())
		goto normal_search;
	    return AS_NORM;
	}
#endif
	else
	    inc_art(selected_only,FALSE);

#ifdef ARTSEARCH
	srchahead = 0;
#endif
	return AS_NORM;
    case 'N':			/* goto next article */
	if (art > lastart)
	    if (!first_subject) {
		art = absfirst;
		artp = article_ptr(art);
	    } else {
		artp = first_subject->articles;
		if (artp->flags & AF_MISSING)
		    inc_art(FALSE,TRUE);
		else
		    art = article_num(artp);
	    }
	else
	    inc_art(FALSE,TRUE);
	if (art <= lastart)
	    reread = TRUE;
#ifdef ARTSEARCH
	srchahead = 0;
#endif
	return AS_NORM;
    case '$':
	art = lastart+1;
	artp = Nullart;
	forcelast = TRUE;
#ifdef ARTSEARCH
	srchahead = 0;
#endif
	return AS_NORM;
    case '1': case '2': case '3':	/* goto specified article */
    case '4': case '5': case '6':	/* or do something with a range */
    case '7': case '8': case '9': case '.':
	forcelast = TRUE;
	switch (numnum()) {
	case NN_INP:
	    return AS_INP;
	case NN_ASK:
	    return AS_ASK;
	case NN_REREAD:
	    reread = TRUE;
#ifdef ARTSEARCH
	    if (srchahead)
		srchahead = -1;
#endif
	    break;
	case NN_NORM:
	    if (was_read(art)) {
		top_article();
		pad(just_a_sec/3);
	    }
	    else {
		putchar('\n');
		return AS_ASK;
	    }
	    break;
	}
	return AS_NORM;
    case Ctl('k'):
	edit_kfile();
	return AS_ASK;
    case Ctl('n'):	/* search for next article with same subject */
    case Ctl('p'):	/* search for previous article with same subject */
	if (*buf == Ctl('n')? next_art_with_subj() : prev_art_with_subj())
	    return AS_NORM;
    case '/': case '?':
normal_search:
#ifdef ARTSEARCH
    {		/* search for article by pattern */
	char cmd = *buf;
	
	reread = TRUE;		/* assume this */
	page_line = 1;
	switch (art_search(buf, (sizeof buf), TRUE)) {
	case SRCH_ERROR:
	    art = curr_art;
	    return AS_ASK;
	case SRCH_ABORT:
	    art = curr_art;
	    return AS_INP;
	case SRCH_INTR:
#ifdef VERBOSE
	    IF(verbose)
		printf("\n(Interrupted at article %ld)\n",(long)art) FLUSH;
	    ELSE
#endif
#ifdef TERSE
		printf("\n(Intr at %ld)\n",(long)art) FLUSH;
#endif
	    art = curr_art;	    /* restore to current article */
	    return AS_ASK;
	case SRCH_DONE:
	    fputs("done\n",stdout) FLUSH;
	    pad(just_a_sec/3);	/* 1/3 second */
	    if (!srchahead) {
		art = curr_art;
		return AS_ASK;
	    }
	    top_article();
	    reread = FALSE;
	    return AS_NORM;
	case SRCH_SUBJDONE:
#ifdef UNDEF
	    fputs("\n\n\n\nSubject not found.\n",stdout) FLUSH;
	    pad(just_a_sec/3);	/* 1/3 second */
#endif
	    top_article();
	    reread = FALSE;
	    return AS_NORM;
	case SRCH_NOTFOUND:
	    fputs("\n\n\n\nNot found.\n",stdout) FLUSH;
	    art = curr_art;  /* restore to current article */
	    return AS_ASK;
	case SRCH_FOUND:
	    if (cmd == Ctl('n') || cmd == Ctl('p')) {
		oldsubject = TRUE;
		reread = FALSE;
	    }
	    break;
	}
	return AS_NORM;
    }
#else
    buf[1] = '\0';
    notincl(buf);
    return AS_ASK;
#endif
    case 'u':			/* unsubscribe from this newsgroup? */
	rcchar[ng] = NEGCHAR;
	return AS_CLEAN;
    case 'M':
	if (art <= lastart) {
	    delay_unmark(artp);
	    oneless(artp);
	    printf("\nArticle %ld will return.\n",(long)art) FLUSH;
	}
	return AS_ASK;
    case 'm':
	if (art >= absfirst && art <= lastart) {
	    unmark_as_read();
	    printf("\nArticle %ld marked as still unread.\n",(long)art) FLUSH;
	}
	return AS_ASK;
    case 'c':			/* catch up */
	switch (ask_catchup()) {
	case 'n':
	    return AS_ASK;
	case 'u':
	    return AS_CLEAN;
	}
	art = lastart+1;
	artp = Nullart;
	forcelast = FALSE;
	return AS_NORM;
    case 'Q':
	exit_code = NG_ASK;
	/* FALL THROUGH */
    case 'q':			/* go back up to newsgroup level? */
	return AS_CLEAN;
    case 'j':
	putchar('\n') FLUSH;
	if (art >= absfirst && art <= lastart)
	    mark_as_read();
	return AS_ASK;
    case 'h': {			/* help? */
	int cmd;

	if ((cmd = help_art()) > 0)
	    pushchar(cmd);
	return AS_ASK;
    }
    case '&':
	if (switcheroo()) /* get rest of command */
	    return AS_INP;	/* if rubbed out, try something else */
	return AS_ASK;
    case '#':
#ifdef VERBOSE
	IF(verbose)
	    printf("\nThe last article is %ld.\n",(long)lastart) FLUSH;
	ELSE
#endif
#ifdef TERSE
	    printf("\n%ld\n",(long)lastart) FLUSH;
#endif
	return AS_ASK;
    case '+':			/* enter selection mode */
run_the_selector:
	*buf = do_selector(*buf);
	switch (*buf) {