/*
 * Program:	Network News Transfer Protocol (NNTP) client routines for DOS
 *
 * Author:	Mark Crispin
 *		Networks and Distributed Computing
 *		Computing & Communications
 *		University of Washington
 *		Administration Building, AG-44
 *		Seattle, WA  98195
 *		Internet: MRC@CAC.Washington.EDU
 *
 * Date:	25 January 1993
 * Last Edited:	10 September 1993
 *
 * Copyright 1993 by the University of Washington.
 *
 *  Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notices appear in all copies and that both the
 * above copyright notices and this permission notice appear in supporting
 * documentation, and that the name of the University of Washington not be
 * used in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.  This software is made
 * available "as is", and
 * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
 * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
 * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
 * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */


#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include "mail.h"
#include "osdep.h"
#include <time.h>
#include <sys\stat.h>
#include "dawz.h"
#undef LOCAL
#include "smtp.h"
#include "nntp.h"
#include "nntpcdos.h"
#include "rfc822.h"
#include "misc.h"

/* NNTP mail routines */


/* Driver dispatch used by MAIL */

DRIVER nntpdriver = {
  "nntp",			/* driver name */
  (DRIVER *) NIL,		/* next driver */
  nntp_valid,			/* mailbox is valid for us */
  nntp_parameters,		/* manipulate parameters */
  nntp_find,			/* find mailboxes */
  nntp_find_bboards,		/* find bboards */
  nntp_find_all,		/* find all mailboxes */
  nntp_find_all_bboards,	/* find all bboards */
  nntp_subscribe,		/* subscribe to mailbox */
  nntp_unsubscribe,		/* unsubscribe from mailbox */
  nntp_subscribe_bboard,	/* subscribe to bboard */
  nntp_unsubscribe_bboard,	/* unsubscribe from bboard */
  nntp_create,			/* create mailbox */
  nntp_delete,			/* delete mailbox */
  nntp_rename,			/* rename mailbox */
  nntp_mopen,			/* open mailbox */
  nntp_close,			/* close mailbox */
  nntp_fetchfast,		/* fetch message "fast" attributes */
  nntp_fetchflags,		/* fetch message flags */
  nntp_fetchstructure,		/* fetch message envelopes */
  nntp_fetchheader,		/* fetch message header only */
  nntp_fetchtext,		/* fetch message body only */
  nntp_fetchbody,		/* fetch message body section */
  nntp_setflag,			/* set message flag */
  nntp_clearflag,		/* clear message flag */
  nntp_search,			/* search for message based on criteria */
  nntp_ping,			/* ping mailbox to see if still alive */
  nntp_check,			/* check for new messages */
  nntp_expunge,			/* expunge deleted messages */
  nntp_copy,			/* copy messages to another mailbox */
  nntp_move,			/* move messages to another mailbox */
  nntp_append,			/* append string message to mailbox */
  nntp_gc			/* garbage collect stream */
};

				/* prototype stream */
MAILSTREAM nntpproto = {&nntpdriver};

/* NNTP mail validate mailbox
 * Accepts: mailbox name
 * Returns: our driver if name is valid, NIL otherwise
 */

DRIVER *nntp_valid (name)
	char *name;
{
				/* must be bboard */
  return *name == '*' ? mail_valid_net (name,&nntpdriver,NIL,NIL) : NIL;
}


/* News manipulate driver parameters
 * Accepts: function code
 *	    function-dependent value
 * Returns: function-dependent return value
 */

void *nntp_parameters (function,value)
	long function;
	void *value;
{
  fatal ("Invalid nntp_parameters function");
  return NIL;
}

/* NNTP mail find list of mailboxes
 * Accepts: mail stream
 *	    pattern to search
 */

void nntp_find (stream,pat)
	MAILSTREAM *stream;
	char *pat;
{
  /* Always a no-op */
}


/* NNTP mail find list of bboards
 * Accepts: mail stream
 *	    pattern to search
 */

void nntp_find_bboards (stream,pat)
	MAILSTREAM *stream;
	char *pat;
{
  FILE *f = NIL;
  void *s;
  char *t,*u,*bbd,*patx,tmp[MAILTMPLEN],patc[MAILTMPLEN];
  if (stream) {			/* use .newsrc if a stream given */
				/* begin with a host specification? */
    if (((*pat == '{') || ((*pat == '*') && (pat[1] == '{'))) &&
	(t = strchr (pat,'}')) && *(patx = ++t)) {
      if (*pat == '*') pat++;	/* yes, skip leading * (old Pine behavior) */
      strcpy (tmp,pat);		/* copy host name */
      bbd = tmp + (patx - pat);	/* where we write the bboards */
    }
    else {			/* no host specification */
      bbd = tmp;		/* no prefix */
      patx = pat;		/* use entire specification */
    }
				/* check all newsgroups from .newsrc */
    while (t = nntp_read_sdb (&f)) {
      if (u = strchr (t,':')) {	/* subscribed newsgroup? */
	*u = '\0';		/* tie off at end of name */
	if (pmatch (t,patx)) {	/* pattern patch */
	  strcpy (bbd,t);	/* write newsgroup name after hostspec */
	  mm_bboard (tmp);
	}
      }
      fs_give ((void **) &t);	/* discard the line */
    }
  }
				/* use subscription manager if no stream */
  else while (t = sm_read (&s))
    if ((*t == '*') && pmatch (t+1,pat)) mm_bboard (t+1);
}

/* NNTP mail find list of all mailboxes
 * Accepts: mail stream
 *	    pattern to search
 */

void nntp_find_all (stream,pat)
	MAILSTREAM *stream;
	char *pat;
{
  /* Always a no-op */
}


/* NNTP mail find list of all bboards
 * Accepts: mail stream
 *	    pattern to search
 */

void nntp_find_all_bboards (stream,pat)
	MAILSTREAM *stream;
	char *pat;
{
  char *s,*t,*bbd,*patx,tmp[MAILTMPLEN];
				/* use .newsrc if a stream given */
  if (stream && LOCAL && LOCAL->nntpstream) {
				/* begin with a host specification? */
    if (((*pat == '{') || ((*pat == '*') && (pat[1] == '{'))) &&
	(t = strchr (pat,'}')) && *(patx = ++t)) {
      if (*pat == '*') pat++;	/* yes, skip leading * (old Pine behavior) */
      strcpy (tmp,pat);		/* copy host name */
      bbd = tmp + (patx - pat);	/* where we write the bboards */
    }
    else {			/* no host specification */
      bbd = tmp;		/* no prefix */
      patx = pat;		/* use entire specification */
    }
				/* ask server for all active newsgroups */
    if (!(smtp_send (LOCAL->nntpstream,"LIST","ACTIVE") == NNTPGLIST)) return;
				/* process data until we see final dot */
    while ((s = tcp_getline (LOCAL->nntpstream->tcpstream)) && *s != '.') {
				/* tie off after newsgroup name */
      if (t = strchr (s,' ')) *t = '\0';
      if (pmatch (s,patx)) {	/* report to main program if have match */
	strcpy (bbd,s);		/* write newsgroup name after prefix */
	mm_bboard (tmp);
      }
      fs_give ((void **) &s);	/* clean up */
    }
  }
}

/* NNTP mail subscribe to mailbox
 * Accepts: mail stream
 *	    mailbox to add to subscription list
 * Returns: T on success, NIL on failure
 */

long nntp_subscribe (stream,mailbox)
	MAILSTREAM *stream;
	char *mailbox;
{
  return NIL;			/* never valid for NNTP */
}


/* NNTP mail unsubscribe to mailbox
 * Accepts: mail stream
 *	    mailbox to delete from subscription list
 * Returns: T on success, NIL on failure
 */

long nntp_unsubscribe (stream,mailbox)
	MAILSTREAM *stream;
	char *mailbox;
{
  return NIL;			/* never valid for NNTP */
}


/* NNTP mail subscribe to bboard
 * Accepts: mail stream
 *	    bboard to add to subscription list
 * Returns: T on success, NIL on failure
 */

long nntp_subscribe_bboard (stream,mailbox)
	MAILSTREAM *stream;
	char *mailbox;
{
  char *s = strchr (mailbox,'}');
  return s ? nntp_update_sdb (s+1,":") : NIL;
}


/* NNTP mail unsubscribe to bboard
 * Accepts: mail stream
 *	    bboard to delete from subscription list
 * Returns: T on success, NIL on failure
 */

long nntp_unsubscribe_bboard (stream,mailbox)
	MAILSTREAM *stream;
	char *mailbox;
{
  char *s = strchr (mailbox,'}');
  return s ? nntp_update_sdb (s+1,"!") : NIL;
}

/* NNTP mail create mailbox
 * Accepts: mail stream
 *	    mailbox name to create
 * Returns: T on success, NIL on failure
 */

long nntp_create (stream,mailbox)
	MAILSTREAM *stream;
	char *mailbox;
{
  return NIL;			/* never valid for NNTP */
}


/* NNTP mail delete mailbox
 *	    mailbox name to delete
 * Returns: T on success, NIL on failure
 */

long nntp_delete (stream,mailbox)
	MAILSTREAM *stream;
	char *mailbox;
{
  return NIL;			/* never valid for NNTP */
}


/* NNTP mail rename mailbox
 * Accepts: mail stream
 *	    old mailbox name
 *	    new mailbox name
 * Returns: T on success, NIL on failure
 */

long nntp_rename (stream,old,new)
	MAILSTREAM *stream;
	char *old;
	char *new;
{
  return NIL;			/* never valid for NNTP */
}

/* NNTP mail open
 * Accepts: stream to open
 * Returns: stream on success, NIL on failure
 */

MAILSTREAM *nntp_mopen (stream)
	MAILSTREAM *stream;
{
  long i,j,k;
  long nmsgs = 0;
  long recent = 0;
  long unseen = 0;
  static int tmpcnt = 0;
  char c = NIL,*s,*t,tmp[MAILTMPLEN];
  NETMBX mb;
  FILE *f = NIL;
  void *tcpstream;
  SMTPSTREAM *nstream = NIL;
				/* return prototype for OP_PROTOTYPE call */
  if (!stream) return &nntpproto;
  mail_valid_net_parse (stream->mailbox,&mb);
				/* hokey default for local host */
  if (!lhostn) lhostn = cpystr ("localhost");
  if (!*mb.mailbox) strcpy (mb.mailbox,"general");
  if (LOCAL) {			/* if recycle stream, see if changing hosts */
    if (strcmp (lcase (mb.host),lcase (strcpy (tmp,LOCAL->host)))) {
      sprintf (tmp,"Closing connection to %s",LOCAL->host);
      if (!stream->silent) mm_log (tmp,(long) NIL);
    }
    else {			/* same host, preserve NNTP connection */
      sprintf (tmp,"Reusing connection to %s",LOCAL->host);
      if (!stream->silent) mm_log (tmp,(long) NIL);
      nstream = LOCAL->nntpstream;
      LOCAL->nntpstream = NIL;/* keep nntp_close() from punting it */
    }
    nntp_close (stream);	/* do close action */
    stream->dtb = &nntpdriver;/* reattach this driver */
    mail_free_cache (stream);	/* clean up cache */
  }

				/* open NNTP now if not already open */
  if (!nstream && (tcpstream = tcp_open (mb.host,mb.port ?
					 (long) mb.port : NNTPTCPPORT))) {
    nstream = (SMTPSTREAM *) fs_get (sizeof (SMTPSTREAM));
    nstream->tcpstream = tcpstream;
    nstream->debug = stream->debug;
    nstream->reply = NIL;
				/* get NNTP greeting */
    if (smtp_reply (nstream) == NNTPGREET)
      mm_log (nstream->reply + 4,(long) NIL);
    else {			/* oops */
      mm_log (nstream->reply,ERROR);
      smtp_close (nstream);	/* punt stream */
      nstream = NIL;
    }
  }
  if (nstream) {		/* now try to open newsgroup */
    if ((!stream->halfopen) &&	/* open the newsgroup if not halfopen */
	((smtp_send (nstream,"GROUP",mb.mailbox) != NNTPGOK) ||
	 ((nmsgs = strtol (nstream->reply + 4,&s,10)) < 0) ||
	 ((i = strtol (s,&s,10)) < 0) || ((j = strtol (s,&s,10)) < 0))) {
      mm_log (nstream->reply,ERROR);
      smtp_close (nstream);	/* punt stream */
      nstream = NIL;
      return NIL;
    }
				/* newsgroup open, instantiate local data */
    stream->local = fs_get (sizeof (NNTPLOCAL));
    LOCAL->nntpstream = nstream;
    LOCAL->dirty = NIL;		/* no update to .newsrc needed yet */
				/* copy host and newsgroup name */
    LOCAL->host = cpystr (mb.host);
    LOCAL->name = cpystr (mb.mailbox);
    if (!((s = getenv ("TMP")) || (s = getenv ("TEMP")))) s = myhomedir ();
    if ((i = strlen (s)) && ((s[i-1] == '\\') || (s[i-1]=='/')))
      s[i-1] = '\0';		/* tie off trailing directory delimiter */
    sprintf (tmp,"%s\\NEWS%4.4d.TMP",s,++tmpcnt);
    LOCAL->tmp = cpystr (tmp);	/* build name of tmp file we use */
    stream->sequence++;		/* bump sequence number */
    stream->readonly = T;	/* make sure higher level knows readonly */
    if (stream->halfopen) {	/* no map or state for half-open */
      LOCAL->number = NIL;
      LOCAL->seen = NIL;
    }

    else {			/* try to get list of valid numbers */
      if (smtp_send (nstream,"LISTGROUP",mb.mailbox) == NNTPGOK) {
				/* create number map */
	LOCAL->number = (unsigned long *) fs_get(nmsgs*sizeof (unsigned long));
				/* initialize c-client/NNTP map */
	for (i = 0; (i<nmsgs) && (s = tcp_getline (nstream->tcpstream)); ++i) {
	  LOCAL->number[i] = atol (s);
	  fs_give ((void **) &s);
	}
				/* get and flush the dot-line */
	if ((s = tcp_getline (nstream->tcpstream)) && (*s == '.'))
	  fs_give ((void **) &s);
	else {			/* lose */
	  mm_log ("NNTP article listing protocol failure",ERROR);
	  nntp_close (stream);	/* do close action */
	}
      }
      else {			/* a vanilla NNTP server, barf */
				/* any holes in sequence? */
	if (nmsgs != (k = (j - i) + 1)) {
	  sprintf (tmp,"[HOLES] %ld non-existant message(s)",k-nmsgs);
	  mm_notify (stream,tmp,(long) NIL);
	  nmsgs = k;		/* sure are, set new message count */
	}
				/* create number map */
	LOCAL->number = (unsigned long *) fs_get(nmsgs*sizeof (unsigned long));
				/* initialize c-client/NNTP map */
	for (k = 0; k < nmsgs; ++k) LOCAL->number[k] = i + k;
      }
				/* create state list */
      LOCAL->seen = (char *) fs_get (nmsgs * sizeof (char));
  				/* initialize state */
      for (i = 0; i < nmsgs; ++i) LOCAL->seen[i] = NIL;

      mail_exists(stream,nmsgs);/* notify upper level about mailbox size */
      i = 0;			/* nothing scanned yet */
      while (t = nntp_read_sdb (&f)) {
	if ((s = strpbrk (t,":!")) && (c = *s)) {
	  *s++ = '\0';		/* tie off newsgroup name, point to data */
	  if (strcmp (t,LOCAL->name)) s = NIL;
	  else break;		/* found it! */
	}
	fs_give ((void **) &t);	/* give back this entry line */
      }
      if (s) {			/* newsgroup found? */
	if (c == '!') mm_log ("Not subscribed to that newsgroup",WARN);
	while (*s && i < nmsgs){/* process until run out of messages or list */
	  j = strtol (s,&s,10);	/* start of possible range */
				/* other end of range */
	  k = (*s == '-') ? strtol (++s,&s,10) : j;
				/* skip messages before this range */
	  while ((LOCAL->number[i] < j) && (i < nmsgs)) {
	    if (!unseen) unseen = i + 1;
	    i++;
	  }
	  while ((LOCAL->number[i] >= j) && (LOCAL->number[i] <= k) &&
		 (i < nmsgs)){	/* mark messages within the range as seen */
	    LOCAL->seen[i++] = T;
	    mail_elt (stream,i)->deleted = T;
	  }
	  if (*s == ',') s++;	/* skip past comma */
	  else if (*s) {	/* better not be anything else then */
	    mm_log ("Bogus syntax in news state file",ERROR);
	    break;		/* give up fast!! */
	  }
	}
      }
      else mm_log ("No state for newsgroup found, reading as new",WARN);
      if (t) {			/* need to free up cruft? */
	fs_give ((void **) &t);	/* yes, give back newsrc entry */
	fclose (f);		/* close the file */
      }
      while (i++ < nmsgs) {	/* mark all remaining messages as new */
	mail_elt (stream,i)->recent = T;
	++recent;		/* count another recent message */
      }
      if (unseen) {		/* report first unseen message */
	sprintf (tmp,"[UNSEEN] %ld is first unseen message",unseen);
	mm_notify (stream,tmp,(long) NIL);
      }
				/* notify upper level about recent */
      mail_recent(stream,recent);
				/* notify if empty bboard */
      if (!(stream->nmsgs||stream->silent)) mm_log ("Newsgroup is empty",WARN);
    }
  }
  return LOCAL ? stream : NIL;	/* if stream is alive, return to caller */
}

/* NNTP mail close
 * Accepts: MAIL stream
 */

void nntp_close (stream)
	MAILSTREAM *stream;
{
  if (LOCAL) {			/* only if a file is open */
    nntp_check (stream);	/* dump final checkpoint */
    if (LOCAL->tmp) {		/* flush temp file if any */
      unlink (LOCAL->tmp);	/* sayonara */
      fs_give ((void **) &LOCAL->tmp);
    }
    if (LOCAL->name) fs_give ((void **) &LOCAL->name);
    if (LOCAL->host) fs_give ((void **) &LOCAL->host);
    if (LOCAL->number) fs_give ((void **) &LOCAL->number);
    if (LOCAL->seen) fs_give ((void **) &LOCAL->seen);
				/* close NNTP connection */
    if (LOCAL->nntpstream) smtp_close (LOCAL->nntpstream);
				/* nuke the local data */
    fs_give ((void **) &stream->local);
    stream->dtb = NIL;		/* log out the DTB */
  }
}

/* NNTP mail fetch fast information
 * Accepts: MAIL stream
 *	    sequence
 */

void nntp_fetchfast (stream,sequence)
	MAILSTREAM *stream;
	char *sequence;
{
  return;			/* no-op for local mail */
}


/* NNTP mail fetch flags
 * Accepts: MAIL stream
 *	    sequence
 */

void nntp_fetchflags (stream,sequence)
	MAILSTREAM *stream;
	char *sequence;
{
  return;			/* no-op for local mail */
}

/* NNTP mail fetch envelope
 * Accepts: MAIL stream
 *	    message # to fetch
 *	    pointer to return body
 * Returns: envelope of this message, body returned in body value
 *
 * Fetches the "fast" information as well
 */

#define MAXHDR (unsigned long) 4*MAILTMPLEN

ENVELOPE *nntp_fetchstructure (stream,msgno,body)
	MAILSTREAM *stream;
	long msgno;
	BODY **body;
{
  char *h,tmp[MAXHDR];
  LONGCACHE *lelt;
  ENVELOPE **env;
  STRING bs;
  DAWZDATA d;
  BODY **b;
  MESSAGECACHE *elt = mail_elt (stream,msgno);
  long m = msgno - 1;
  unsigned long hdrsize;
  unsigned long textsize = 0;
  if (stream->scache) {		/* short cache */
    if (msgno != stream->msgno){/* flush old poop if a different message */
      mail_free_envelope (&stream->env);
      mail_free_body (&stream->body);
    }
    stream->msgno = msgno;
    env = &stream->env;		/* get pointers to envelope and body */
    b = &stream->body;
  }
  else {			/* long cache */
    lelt = mail_lelt (stream,msgno);
    env = &lelt->env;		/* get pointers to envelope and body */
    b = &lelt->body;
  }

  if ((body && !*b) || !*env) {	/* have the poop we need? */
    mail_free_envelope (env);	/* flush old envelope and body */
    mail_free_body (b);
    sprintf (tmp,"%ld",LOCAL->number[m]);
    if (smtp_send (LOCAL->nntpstream,"HEAD",tmp) == NNTPHEAD) {
      nntp_slurp (stream,&hdrsize);
				/* limit header size */
      if (hdrsize > MAXHDR) hdrsize = MAXHDR;
      h = (char *) fs_get (hdrsize +1);
				/* read header */
      read (LOCAL->fd,h,hdrsize);
      h[hdrsize] = '\0';	/* ensure tied off */
      close (LOCAL->fd);	/* clean up the file descriptor */
    }
    else {			/* failed, mark as deleted */
      LOCAL->seen[m] = T;
      mail_elt (stream,msgno)->deleted = T;
      h = cpystr ("");		/* no header */
      hdrsize = 0;		/* empty header */
    }
    if (body) {			/* get message text */
      sprintf (tmp,"%ld",LOCAL->number[m]);
      if (smtp_send (LOCAL->nntpstream,"BODY",tmp) == NNTPBODY) {
	nntp_slurp (stream,&textsize);
	d.fd = LOCAL->fd;	/* set initial stringstruct */
	d.pos = 0;		/* starting at beginning of file */
	INIT (&bs,dawz_string,(void *) &d,textsize);
      }
      else {			/* failed, mark as deleted */
	LOCAL->seen[m] = T;
	mail_elt (stream,msgno)->deleted = T;
	body = NIL;		/* failed or some reason */
      }
    }
				/* calculate message size */
    elt->rfc822_size = hdrsize + textsize;
				/* parse envelope and body */
    rfc822_parse_msg (env,body ? b : NIL,h,hdrsize,body ? &bs : NIL,
		      lhostn,tmp);
    fs_give ((void **) &h);	/* don't need header any more */
				/* clean up the file descriptor */
    if (body) close ((int) bs.data);
				/* parse date */
    if (*env && (*env)->date) mail_parse_date (elt,(*env)->date);
    if (!elt->month) mail_parse_date (elt,"01-JAN-1969 00:00:00 GMT");
  }
  if (body) *body = *b;		/* return the body */
  return *env;			/* return the envelope */
}

/* NNTP mail fetch message header
 * Accepts: MAIL stream
 *	    message # to fetch
 * Returns: message header in RFC822 format
 */

char *nntp_fetchheader (stream,msgno)
	MAILSTREAM *stream;
	long msgno;
{
  char tmp[MAILTMPLEN];
  unsigned long hdrsize;
  long m = msgno - 1;
				/* set default gets routine */
  if (!mailgets) mailgets = mm_gets;
  if (stream->text) fs_give ((void **) &stream->text);
				/* get the header */
  sprintf (tmp,"%ld",LOCAL->number[m]);
  if (smtp_send (LOCAL->nntpstream,"HEAD",tmp) == NNTPHEAD) {
    nntp_slurp (stream,&hdrsize);
				/* return it to user */
    stream->text = (*mailgets) (nntp_read,stream,hdrsize);
    close (LOCAL->fd);		/* clean up the file descriptor */
  }
  else {			/* failed, mark as deleted */
    LOCAL->seen[m] = T;
    mail_elt (stream,msgno)->deleted = T;
  }
  return stream->text ? stream->text : "";
}


/* NNTP mail fetch message text (only)
	body only;
 * Accepts: MAIL stream
 *	    message # to fetch
 * Returns: message text in RFC822 format
 */

char *nntp_fetchtext (stream,msgno)
	MAILSTREAM *stream;
	long msgno;
{
  MESSAGECACHE *elt = mail_elt (stream,msgno);
  unsigned long textsize;
  long m = msgno - 1;
  char tmp[MAILTMPLEN];
				/* set default gets routine */
  if (!mailgets) mailgets = mm_gets;
  if (stream->text) fs_give ((void **) &stream->text);
				/* get the text */
  sprintf (tmp,"%ld",LOCAL->number[m]);
  if (smtp_send (LOCAL->nntpstream,"BODY",tmp) == NNTPBODY) {
    nntp_slurp (stream,&textsize);
				/* return it to user */
    stream->text = (*mailgets) (nntp_read,stream,textsize);
    close (LOCAL->fd);		/* clean up the file descriptor */
  }
  else {			/* failed, mark as deleted */
    LOCAL->seen[m] = T;
    mail_elt (stream,msgno)->deleted = T;
  }
  elt->seen = T;		/* mark as seen */
  return stream->text ? stream->text : "";
}

/* NNTP fetch message body as a structure
 * Accepts: Mail stream
 *	    message # to fetch
 *	    section specifier
 *	    pointer to length
 * Returns: pointer to section of message body
 */

char *nntp_fetchbody (stream,m,s,len)
	MAILSTREAM *stream;
	long m;
	char *s;
	unsigned long *len;
{
  BODY *b;
  PART *pt;
  unsigned long i;
  unsigned long offset = 0;
  unsigned long textsize;
  MESSAGECACHE *elt = mail_elt (stream,m);
  char tmp[MAILTMPLEN];
				/* set default gets routine */
  if (!mailgets) mailgets = mm_gets;
  if (stream->text) fs_give ((void **) &stream->text);
				/* make sure have a body */
  if (!(nntp_fetchstructure (stream,m,&b) && b && s && *s &&
	((i = strtol (s,&s,10)) > 0))) return NIL;
  do {				/* until find desired body part */
				/* multipart content? */
    if (b->type == TYPEMULTIPART) {
      pt = b->contents.part;	/* yes, find desired part */
      while (--i && (pt = pt->next));
      if (!pt) return NIL;	/* bad specifier */
				/* note new body, check valid nesting */
      if (((b = &pt->body)->type == TYPEMULTIPART) && !*s) return NIL;
      offset = pt->offset;	/* get new offset */
    }
    else if (i != 1) return NIL;/* otherwise must be section 1 */
				/* need to go down further? */
    if (i = *s) switch (b->type) {
    case TYPEMESSAGE:		/* embedded message, calculate new offset */
      offset = b->contents.msg.offset;
      b = b->contents.msg.body;	/* get its body, drop into multipart case */
    case TYPEMULTIPART:		/* multipart, get next section */
      if ((*s++ == '.') && (i = strtol (s,&s,10)) > 0) break;
    default:			/* bogus subpart specification */
      return NIL;
    }
  } while (i);

				/* lose if body bogus */
  if ((!b) || b->type == TYPEMULTIPART) return NIL;
				/* get the text */
  sprintf (tmp,"%ld",LOCAL->number[m - 1]);
  if (smtp_send (LOCAL->nntpstream,"BODY",tmp) == NNTPBODY) {
    nntp_slurp (stream,&textsize);
				/* move to that place in the file */
    lseek (LOCAL->fd,offset,SEEK_SET);
				/* return it to user */
    stream->text = (*mailgets) (nntp_read,stream,*len = b->size.ibytes);
    close (LOCAL->fd);		/* clean up the file descriptor */
  }
  else {			/* failed, mark as deleted */
    mail_elt (stream,m)->deleted = T;
    LOCAL->seen[m - 1] = T;
  }
  elt->seen = T;		/* mark as seen */
  return stream->text ? stream->text : "";
}


/* NNTP mail read
 * Accepts: MAIL stream
 *	    number of bytes to read
 *	    buffer address
 * Returns: T if success, NIL otherwise
 */

long nntp_read (stream,count,buffer)
	MAILSTREAM *stream;
	unsigned long count;
	char *buffer;
{
  return read (LOCAL->fd,buffer,(unsigned int) count) ? T : NIL;
}

/* NNTP mail slurp NNTP dot-terminated text
 * Accepts: MAIL stream
 *	    pointer to size to return
 */

void nntp_slurp (stream,siz)
	MAILSTREAM *stream;
	unsigned long *siz;
{
  char *s,*t;
  int i,ok = T;
  char tmp[MAILTMPLEN];
  if ((LOCAL->fd = open (LOCAL->tmp,
			 O_BINARY|O_RDWR|O_TRUNC|O_CREAT,S_IREAD|S_IWRITE))
      < 0) {
    sprintf (tmp,"Can't open scratch file %s",LOCAL->tmp);
    mm_log (tmp,ERROR);
  }
  *siz = 0;			/* initially no data */
  while (s = tcp_getline (LOCAL->nntpstream->tcpstream)) {
    if (*s == '.') {		/* possible end of text? */
      if (s[1]) t = s + 1;	/* pointer to true start of line */
      else {
	fs_give ((void **) &s);	/* free the line */
	break;			/* end of data */
      }
    }
    else t = s;			/* want the entire line */
    if (ok && (LOCAL->fd >= 0)){/* copy it to the file */
      if ((write (LOCAL->fd,t,i = strlen (t)) >= 0) &&
	  (write (LOCAL->fd,"\015\012",2) >= 0))
	*siz += i + 2;		/* tally up size of data */
      else {
	sprintf (tmp,"Error writing scratch file, data trucated at %lu chars",
		 *siz);
	mm_log (tmp,ERROR);
	ok = NIL;		/* don't try any more */
      }
    }
    fs_give ((void **) &s);	/* free the line */
  }
  if (LOCAL->fd >= 0) {		/* making a file? */
    if (ok) {			/* not if some problem happened */
      write (LOCAL->fd,"\015\012",2);
      *siz += 2;		/* write final newline */
    }
				/* rewind to start of file */
    lseek (LOCAL->fd,(unsigned long) 0,SEEK_SET);
  }
}

/* NNTP mail set flag
 * Accepts: MAIL stream
 *	    sequence
 *	    flag(s)
 */

void nntp_setflag (stream,sequence,flag)
	MAILSTREAM *stream;
	char *sequence;
	char *flag;
{
  MESSAGECACHE *elt;
  long i;
  short f = nntp_getflags (stream,flag);
  if (!f) return;		/* no-op if no flags to modify */
				/* get sequence and loop on it */
  if (mail_sequence (stream,sequence)) for (i = 0; i < stream->nmsgs; i++)
    if ((elt = mail_elt (stream,i + 1))->sequence) {
      if (f&fSEEN) elt->seen=T;	/* set all requested flags */
      if (f&fDELETED) {		/* deletion marks it in newsrc */
	elt->deleted = T;	/* mark deleted */
	if (!LOCAL->seen[i]) LOCAL->seen[i] = LOCAL->dirty = T;
      }
      if (f&fFLAGGED) elt->flagged = T;
      if (f&fANSWERED) elt->answered = T;
    }
}


/* NNTP mail clear flag
 * Accepts: MAIL stream
 *	    sequence
 *	    flag(s)
 */

void nntp_clearflag (stream,sequence,flag)
	MAILSTREAM *stream;
	char *sequence;
	char *flag;
{
  MESSAGECACHE *elt;
  long i;
  short f = nntp_getflags (stream,flag);
  if (!f) return;		/* no-op if no flags to modify */
				/* get sequence and loop on it */
  if (mail_sequence (stream,sequence)) for (i = 0; i < stream->nmsgs; i++)
    if ((elt = mail_elt (stream,i + 1))->sequence) {
				/* clear all requested flags */
      if (f&fSEEN) elt->seen = NIL;
      if (f&fDELETED) {
	elt->deleted = NIL;	/* undelete */
	if (LOCAL->seen[i]) {	/* if marked in newsrc */
	  LOCAL->seen[i] = NIL;	/* unmark it now */
	  LOCAL->dirty = T;	/* mark stream as dirty */
	}
      }
      if (f&fFLAGGED) elt->flagged = NIL;
      if (f&fANSWERED) elt->answered = NIL;
    }
}

/* NNTP mail search for messages
 * Accepts: MAIL stream
 *	    search criteria
 */

void nntp_search (stream,criteria)
	MAILSTREAM *stream;
	char *criteria;
{
  long i,n;
  char *d,tmp[MAILTMPLEN];
  search_t f;
				/* initially all searched */
  for (i = 1; i <= stream->nmsgs; ++i) mail_elt (stream,i)->searched = T;
				/* get first criterion */
  if (criteria && (criteria = strtok (criteria," "))) {
				/* for each criterion */
    for (; criteria; (criteria = strtok (NIL," "))) {
      f = NIL; d = NIL; n = 0;	/* init then scan the criterion */
      switch (*ucase (criteria)) {
      case 'A':			/* possible ALL, ANSWERED */
	if (!strcmp (criteria+1,"LL")) f = nntp_search_all;
	else if (!strcmp (criteria+1,"NSWERED")) f = nntp_search_answered;
	break;
      case 'B':			/* possible BCC, BEFORE, BODY */
	if (!strcmp (criteria+1,"CC"))
	  f = nntp_search_string (nntp_search_bcc,&d,&n);
	else if (!strcmp (criteria+1,"EFORE"))
	  f = nntp_search_date (nntp_search_before,&n);
	else if (!strcmp (criteria+1,"ODY"))
	  f = nntp_search_string (nntp_search_body,&d,&n);
	break;
      case 'C':			/* possible CC */
	if (!strcmp (criteria+1,"C"))
	  f = nntp_search_string (nntp_search_cc,&d,&n);
	break;
      case 'D':			/* possible DELETED */
	if (!strcmp (criteria+1,"ELETED")) f = nntp_search_deleted;
	break;
      case 'F':			/* possible FLAGGED, FROM */
	if (!strcmp (criteria+1,"LAGGED")) f = nntp_search_flagged;
	else if (!strcmp (criteria+1,"ROM"))
	  f = nntp_search_string (nntp_search_from,&d,&n);
	break;
      case 'K':			/* possible KEYWORD */
	if (!strcmp (criteria+1,"EYWORD"))
	  f = nntp_search_flag (nntp_search_keyword,&d);
	break;
      case 'N':			/* possible NEW */
	if (!strcmp (criteria+1,"EW")) f = nntp_search_new;
	break;

      case 'O':			/* possible OLD, ON */
	if (!strcmp (criteria+1,"LD")) f = nntp_search_old;
	else if (!strcmp (criteria+1,"N"))
	  f = nntp_search_date (nntp_search_on,&n);
	break;
      case 'R':			/* possible RECENT */
	if (!strcmp (criteria+1,"ECENT")) f = nntp_search_recent;
	break;
      case 'S':			/* possible SEEN, SINCE, SUBJECT */
	if (!strcmp (criteria+1,"EEN")) f = nntp_search_seen;
	else if (!strcmp (criteria+1,"INCE"))
	  f = nntp_search_date (nntp_search_since,&n);
	else if (!strcmp (criteria+1,"UBJECT"))
	  f = nntp_search_string (nntp_search_subject,&d,&n);
	break;
      case 'T':			/* possible TEXT, TO */
	if (!strcmp (criteria+1,"EXT"))
	  f = nntp_search_string (nntp_search_text,&d,&n);
	else if (!strcmp (criteria+1,"O"))
	  f = nntp_search_string (nntp_search_to,&d,&n);
	break;
      case 'U':			/* possible UN* */
	if (criteria[1] == 'N') {
	  if (!strcmp (criteria+2,"ANSWERED")) f = nntp_search_unanswered;
	  else if (!strcmp (criteria+2,"DELETED")) f = nntp_search_undeleted;
	  else if (!strcmp (criteria+2,"FLAGGED")) f = nntp_search_unflagged;
	  else if (!strcmp (criteria+2,"KEYWORD"))
	    f = nntp_search_flag (nntp_search_unkeyword,&d);
	  else if (!strcmp (criteria+2,"SEEN")) f = nntp_search_unseen;
	}
	break;
      default:			/* we will barf below */
	break;
      }
      if (!f) {			/* if can't determine any criteria */
	sprintf (tmp,"Unknown search criterion: %.80s",criteria);
	mm_log (tmp,ERROR);
	return;
      }
				/* run the search criterion */
      for (i = 1; i <= stream->nmsgs; ++i)
	if (mail_elt (stream,i)->searched && !(*f) (stream,i,d,n))
	  mail_elt (stream,i)->searched = NIL;
    }
				/* report search results to main program */
    for (i = 1; i <= stream->nmsgs; ++i)
      if (mail_elt (stream,i)->searched) mail_searched (stream,i);
  }
}

/* NNTP mail ping mailbox
 * Accepts: MAIL stream
 * Returns: T if stream alive, else NIL
 */

long nntp_ping (stream)
	MAILSTREAM *stream;
{
  /* Kludge alert: SMTPSOFTFATAL is 421 which is used in NNTP to mean ``No
   * next article in this group''.  Hopefully, no NNTP server will choke on
   * a bogus command. */
  return (smtp_send (LOCAL->nntpstream,"PING","PONG") != SMTPSOFTFATAL);
}


/* NNTP mail check mailbox
 * Accepts: MAIL stream
 */

void nntp_check (stream)
	MAILSTREAM *stream;
{
  unsigned long i,j,k;
  char *s,tmp[MAILTMPLEN];
  if (!LOCAL->dirty) return;	/* never do if no updates */
  *(s = tmp) = '\0';		/* initialize list */
  for (i = 0,j = 1,k = 0; i < stream->nmsgs; ++i) {
    if (LOCAL->seen[i]) {	/* seen message? */
      k = LOCAL->number[i];	/* this is the top of the current range */
      if (j == 0) j = k;	/* if no range in progress, start one */
    }
    else if (j != 0) {		/* unread message, ending a range */
				/* calculate end of range */
      if (k = LOCAL->number[i] - 1) {
				/* dump range */
	sprintf (s,(j == k) ? "%ld," : "%ld-%ld,",j,k);
	s += strlen (s);	/* find end of string */
      }
      j = 0;			/* no more range in progress */
    }
  }
  if (j) {			/* dump trailing range */
    sprintf (s,(j == k) ? "%ld" : "%ld-%ld",j,k);
    s += strlen (s);		/* find end of string */
  }
  else if (s[-1] == ',') s--;	/* prepare to patch out any trailing comma */
  *s++ = '\0';			/* tie off string */
  nntp_update_sdb (LOCAL->name,tmp);
}

/* NNTP mail expunge mailbox
 * Accepts: MAIL stream
 */

void nntp_expunge (stream)
	MAILSTREAM *stream;
{
  if (!stream->silent)
    mm_log ("Expunge ignored on readonly mailbox",(long) NIL);
}


/* NNTP mail copy message(s)
	s;
 * Accepts: MAIL stream
 *	    sequence
 *	    destination mailbox
 * Returns: T if copy successful, else NIL
 */

long nntp_copy (stream,sequence,mailbox)
	MAILSTREAM *stream;
	char *sequence;
	char *mailbox;
{
  mm_log ("Copy not valid for NNTP",ERROR);
  return NIL;
}

/* NNTP mail move message(s)
	s;
 * Accepts: MAIL stream
 *	    sequence
 *	    destination mailbox
 * Returns: T if move successful, else NIL
 */

long nntp_move (stream,sequence,mailbox)
	MAILSTREAM *stream;
	char *sequence;
	char *mailbox;
{
  mm_log ("Move not valid for NNTP",ERROR);
  return NIL;
}


/* NNTP mail append message from stringstruct
 * Accepts: MAIL stream
 *	    destination mailbox
 *	    stringstruct of messages to append
 * Returns: T if append successful, else NIL
 */

long nntp_append (stream,mailbox,message)
	MAILSTREAM *stream;
	char *mailbox;
	STRING *message;
{
  mm_log ("Append not valid for NNTP",ERROR);
  return NIL;
}


/* NNTP garbage collect stream
 * Accepts: Mail stream
 *	    garbage collection flags
 */

void nntp_gc (stream,gcflags)
	MAILSTREAM *stream;
	long gcflags;
{
  /* nothing for now */
}

/* Internal routines */


/* Read NNTP database
 * Accepts: pointer to subscription database file handle (NIL if first time)
 * Returns: line from the file
 */

char *nntp_read_sdb (f)
	FILE **f;
{
  int i;
  char *s,*t,tmp[MAILTMPLEN];
  if (!*f) {			/* first time through? */
    NEWSRC (tmp);		/* yes, make name of newsrc file and open */
    if (!(*f = fopen (tmp,"r"))) {
      char msg[MAILTMPLEN];
      sprintf (msg,"No news state found, will create %s",tmp);
      mm_log (msg,WARN);
      return NIL;
    }
  }
				/* read a line from the file */
  if (fgets (tmp,MAILTMPLEN,*f)) {
    i = strlen (tmp);		/* how many characters we got */
    if (tmp[i - 1] == '\n') {	/* got a complete line? */
      tmp[i - 1] = '\0';	/* yes, tie off the line */
      s = cpystr (tmp);		/* make return string */
    }
    else {			/* ugh, have to build from fragments */
      t = nntp_read_sdb (f);	/* recuse to get remainder */
      sprintf (s = (char *) fs_get (i + strlen (t) + 1),"%s%s",tmp,t);
      fs_give ((void **) &t);	/* discard fragment */
    }
    return s;			/* return the string we made */
  }
  fclose (*f);			/* end of file, close file */
  *f = NIL;			/* make sure caller knows */
  return NIL;			/* all done */
}

/* Update NNTP database
 * Accepts: newsgroup name
 *	    message data
 * Returns: T if success, NIL if failure
 */

long nntp_update_sdb (name,data)
	char *name;
	char *data;
{
  int i = strlen (name);
  char c,*s,tmp[MAILTMPLEN],new[MAILTMPLEN];
  FILE *f = NIL,*of,*nf;
  OLDNEWSRC (tmp);		/* make name of old newsrc file */
  if (!(of = fopen (tmp,"w"))) {/* open old newsrc */
    mm_log ("Can't create backup of news state",ERROR);
    return NIL;
  }
  NEWNEWSRC (new);		/* make name of new newsrc file */
  if (!(nf = fopen (new,"w"))) {/* open new newsrc */
    mm_log ("Can't create new news state",ERROR);
    fclose (of);
    return NIL;
  }
				/* process .newsrc file */
  while (s = nntp_read_sdb (&f)) {
    fprintf (of,"%s\n",s);	/* write to backup file */
    if ((!strncmp (s,name,i)) && (((c = s[i]) == ':') || (c == '!'))) {
      if (data) switch (*data) {/* first time we saw this entry... */
      case ':':			/* subscription request */
	if (c == '!') c = ':';	/* subscribe if unsubscribed */
	else {			/* complain if already subscribed */
	  sprintf (tmp,"Already subscribed to newsgroup %s",name);
	  mm_log (tmp,ERROR);
	}
	data = s + i;		/* preserve old read state */
	break;
      case '!':			/* unsubscription request? */
	if (c == ':') c = '!';	/* unsubscribe if subscribed */
	else {			/* complain if not subscribed */
	  sprintf (tmp,"Not subscribed to newsgroup %s",name);
	  mm_log (tmp,ERROR);
	}
	data = s + i;		/* preserve old read state */
	break;
      default:			/* update read state */
	break;
      }
				/* write the new entry */
	fprintf (nf,"%s%c %s\n",name,c,data);
	data = NIL;		/* request satisfied */
    }
    else fprintf (nf,"%s\n",s);	/* not the entry we want, write to new file */
    fs_give ((void **) &s);
  }

  if (data) switch (*data) {	/* if didn't find it, make new entry */
  case ':':			/* subscription request */
    fprintf (nf,"%s: \n",name);
    break;
  case '!':			/* unsubscription request? */
    sprintf (tmp,"Not subscribed to newsgroup %s",name);
    mm_log (tmp,ERROR);
    break;
  default:			/* update read state */
    fprintf (nf,"%s: %s\n",name,data);
    break;
  }
  fclose (nf);			/* close new file */
  fclose (of);			/* close backup file */
  NEWSRC (tmp);			/* make name of current file */
  unlink (tmp);			/* remove the current file */
  if (rename (new,tmp)) {	/* rename new database to current */
    mm_log ("Can't update news state",ERROR);
    return NIL;
  }
  return LONGT;			/* return success */
}


/* Parse flag list
 * Accepts: MAIL stream
 *	    flag list as a character string
 * Returns: flag command list
 */

short nntp_getflags (stream,flag)
	MAILSTREAM *stream;
	char *flag;
{
  char tmp[MAILTMPLEN];
  char *t;
  short f = 0;
  short i,j;
  if (flag && *flag) {		/* no-op if no flag string */
				/* check if a list and make sure valid */
    if ((i = (*flag == '(')) ^ (flag[strlen (flag)-1] == ')')) {
      mm_log ("Bad flag list",ERROR);
      return NIL;
    }
				/* copy the flag string w/o list construct */
    strncpy (tmp,flag+i,(j = strlen (flag) - (2*i)));
    tmp[j] = '\0';
    t = ucase (tmp);		/* uppercase only from now on */

    while (*t) {		/* parse the flags */
      if (*t == '\\') {		/* system flag? */
	switch (*++t) {		/* dispatch based on first character */
	case 'S':		/* possible \Seen flag */
	  if (t[1] == 'E' && t[2] == 'E' && t[3] == 'N') i = fSEEN;
	  t += 4;		/* skip past flag name */
	  break;
	case 'D':		/* possible \Deleted flag */
	  if (t[1] == 'E' && t[2] == 'L' && t[3] == 'E' && t[4] == 'T' &&
	      t[5] == 'E' && t[6] == 'D') i = fDELETED;
	  t += 7;		/* skip past flag name */
	  break;
	case 'F':		/* possible \Flagged flag */
	  if (t[1] == 'L' && t[2] == 'A' && t[3] == 'G' && t[4] == 'G' &&
	      t[5] == 'E' && t[6] == 'D') i = fFLAGGED;
	  t += 7;		/* skip past flag name */
	  break;
	case 'A':		/* possible \Answered flag */
	  if (t[1] == 'N' && t[2] == 'S' && t[3] == 'W' && t[4] == 'E' &&
	      t[5] == 'R' && t[6] == 'E' && t[7] == 'D') i = fANSWERED;
	  t += 8;		/* skip past flag name */
	  break;
	default:		/* unknown */
	  i = 0;
	  break;
	}
				/* add flag to flags list */
	if (i && ((*t == '\0') || (*t++ == ' '))) f |= i;
	else {			/* bitch about bogus flag */
	  mm_log ("Unknown system flag",ERROR);
	  return NIL;
	}
      }
      else {			/* no user flags yet */
	mm_log ("Unknown flag",ERROR);
	return NIL;
      }
    }
  }
  return f;
}

/* Search support routines
 * Accepts: MAIL stream
 *	    message number
 *	    pointer to additional data
 *	    pointer to temporary buffer
 * Returns: T if search matches, else NIL
 */

char nntp_search_all (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return T;			/* ALL always succeeds */
}


char nntp_search_answered (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->answered ? T : NIL;
}


char nntp_search_deleted (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->deleted ? T : NIL;
}


char nntp_search_flagged (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->flagged ? T : NIL;
}


char nntp_search_keyword (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return NIL;			/* keywords not supported yet */
}


char nntp_search_new (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  MESSAGECACHE *elt = mail_elt (stream,msgno);
  return (elt->recent && !elt->seen) ? T : NIL;
}

char nntp_search_old (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->recent ? NIL : T;
}


char nntp_search_recent (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->recent ? T : NIL;
}


char nntp_search_seen (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->seen ? T : NIL;
}


char nntp_search_unanswered (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->answered ? NIL : T;
}


char nntp_search_undeleted (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->deleted ? NIL : T;
}


char nntp_search_unflagged (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->flagged ? NIL : T;
}


char nntp_search_unkeyword (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return T;			/* keywords not supported yet */
}


char nntp_search_unseen (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return mail_elt (stream,msgno)->seen ? NIL : T;
}

char nntp_search_before (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return (char) (nntp_msgdate (stream,msgno) < n);
}


char nntp_search_on (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return (char) (nntp_msgdate (stream,msgno) == n);
}


char nntp_search_since (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
				/* everybody interprets "since" as .GE. */
  return (char) (nntp_msgdate (stream,msgno) >= n);
}


unsigned long nntp_msgdate (stream,msgno)
	MAILSTREAM *stream;
	long msgno;
{
  MESSAGECACHE *elt = mail_elt (stream,msgno);
				/* get date if don't have it yet */
  if (!elt->day) nntp_fetchstructure (stream,msgno,NIL);
  return (long) (elt->year << 9) + (elt->month << 5) + elt->day;
}


char nntp_search_body (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return NIL;			/* need code here */
}


char nntp_search_subject (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  char *t = nntp_fetchstructure (stream,msgno,NIL)->subject;
  return t ? search (t,(unsigned long) strlen (t),d,n) : NIL;
}


char nntp_search_text (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  return NIL;			/* need code here */
}

char nntp_search_bcc (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  char tmp[8*MAILTMPLEN];
  tmp[0] = '\0';		/* initially empty string */
				/* get text for address */
  rfc822_write_address (tmp,nntp_fetchstructure(stream,msgno,NIL)->bcc);
  return search (tmp,(unsigned long) strlen (tmp),d,n);
}


char nntp_search_cc (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  char tmp[8*MAILTMPLEN];
  tmp[0] = '\0';		/* initially empty string */
				/* get text for address */
  rfc822_write_address (tmp,nntp_fetchstructure (stream,msgno,NIL)->cc);
  return search (tmp,(unsigned long) strlen (tmp),d,n);
}


char nntp_search_from (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  char tmp[8*MAILTMPLEN];
  tmp[0] = '\0';		/* initially empty string */
				/* get text for address */
  rfc822_write_address (tmp,nntp_fetchstructure (stream,msgno,NIL)->from);
  return search (tmp,(unsigned long) strlen (tmp),d,n);
}


char nntp_search_to (stream,msgno,d,n)
	MAILSTREAM *stream;
	long msgno;
	char *d;
	long n;
{
  char tmp[8*MAILTMPLEN];
  tmp[0] = '\0';			/* initially empty string */
				/* get text for address */
  rfc822_write_address (tmp,nntp_fetchstructure (stream,msgno,NIL)->to);
  return search (tmp,(unsigned long) strlen (tmp),d,n);
}

/* Search parsers */


/* Parse a date
 * Accepts: function to return
 *	    pointer to date integer to return
 * Returns: function to return
 */

search_t nntp_search_date (f,n)
	search_t f;
	long *n;
{
  long i;
  char *s;
  MESSAGECACHE elt;
				/* parse the date and return fn if OK */
  return (nntp_search_string (f,&s,&i) && mail_parse_date (&elt,s) &&
	  (*n = (elt.year << 9) + (elt.month << 5) + elt.day)) ? f : NIL;
}

/* Parse a flag
 * Accepts: function to return
 *	    pointer to string to return
 * Returns: function to return
 */

search_t nntp_search_flag (f,d)
	search_t f;
	char **d;
{
				/* get a keyword, return if OK */
  return (*d = strtok (NIL," ")) ? f : NIL;
}


/* Parse a string
 * Accepts: function to return
 *	    pointer to string to return
 *	    pointer to string length to return
 * Returns: function to return
 */

search_t nntp_search_string (f,d,n)
	search_t f;
	char **d;
	long *n;
{
  char *c = strtok (NIL,"");	/* remainder of criteria */
  if (c) {			/* better be an argument */
    switch (*c) {		/* see what the argument is */
    case '\0':			/* catch bogons */
    case ' ':
      return NIL;
    case '"':			/* quoted string */
      if (!(strchr (c+1,'"') && (*d = strtok (c,"\"")) && (*n = strlen (*d))))
	return NIL;
      break;
    case '{':			/* literal string */
      *n = strtol (c+1,&c,10);	/* get its length */
      if (*c++ != '}' || *c++ != '\015' || *c++ != '\012' ||
	  *n > strlen (*d = c)) return NIL;
      c[*n] = '\255';		/* write new delimiter */
      strtok (c,"\255");	/* reset the strtok mechanism */
      break;
    default:			/* atomic string */
      *n = strlen (*d = strtok (c," "));
      break;
    }
    return f;
  }
  else return NIL;
}