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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: quit.c,v 1.20 2009/10/27 23:59:40 deraadt Exp $	*/
/*	$NetBSD: quit.c,v 1.6 1996/12/28 07:11:07 tls Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "rcv.h"
#include <fcntl.h>
#include "extern.h"

/*
 * Rcv -- receive mail rationally.
 *
 * Termination processing.
 */

/*
 * The "quit" command.
 */
int
quitcmd(void *v)
{
	/*
	 * If we are sourcing, then return 1 so execute() can handle it.
	 * Otherwise, return -1 to abort command loop.
	 */
	if (sourcing)
		return(1);
	return(-1);
}

/*
 * Save all of the undetermined messages at the top of "mbox"
 * Save all untouched messages back in the system mailbox.
 * Remove the system mailbox, if none saved there.
 */
int
quit(void)
{
	int mcount, p, modify, autohold, anystat, holdbit, nohold;
	FILE *ibuf = NULL, *obuf, *fbuf, *rbuf, *readstat = NULL, *abuf;
	struct message *mp;
	int c, fd;
	struct stat minfo;
	char *mbox, tempname[PATHSIZE];

	/*
	 * If we are read only, we can't do anything,
	 * so just return quickly.
	 */
	if (readonly)
		return(0);

	/*
	 * If editing (not reading system mail box), then do the work
	 * in edstop()
	 */
	if (edit)
		return(edstop());

	/*
	 * See if there any messages to save in mbox.  If no, we
	 * can save copying mbox to /tmp and back.
	 *
	 * Check also to see if any files need to be preserved.
	 * Delete all untouched messages to keep them out of mbox.
	 * If all the messages are to be preserved, just exit with
	 * a message.
	 */
	fbuf = Fopen(mailname, "r+");
	if (fbuf == NULL)
		goto newmail;
	if (flock(fileno(fbuf), LOCK_EX) == -1) {
		warn("Unable to lock mailbox");
		(void)Fclose(fbuf);
		return(-1);
	}
	if (!spool_lock()) {
		(void)Fclose(fbuf);
		return(-1);		/* lockspool printed the error for us */
	}
	rbuf = NULL;
	if (fstat(fileno(fbuf), &minfo) >= 0 && minfo.st_size > mailsize) {
		puts("New mail has arrived.");
		(void)snprintf(tempname, sizeof(tempname),
		    "%s/mail.RqXXXXXXXXXX", tmpdir);
		if ((fd = mkstemp(tempname)) == -1 ||
		    (rbuf = Fdopen(fd, "w")) == NULL)
			goto newmail;
#ifdef APPEND
		fseek(fbuf, (long)mailsize, SEEK_SET);
		while ((c = getc(fbuf)) != EOF)
			(void)putc(c, rbuf);
#else
		p = minfo.st_size - mailsize;
		while (p-- > 0) {
			c = getc(fbuf);
			if (c == EOF)
				goto newmail;
			(void)putc(c, rbuf);
		}
#endif
		(void)Fclose(rbuf);
		if ((rbuf = Fopen(tempname, "r")) == NULL)
			goto newmail;
		(void)rm(tempname);
	}

	/*
	 * Adjust the message flags in each message.
	 */
	anystat = 0;
	autohold = value("hold") != NULL;
	holdbit = autohold ? MPRESERVE : MBOX;
	nohold = MBOX|MSAVED|MDELETED|MPRESERVE;
	if (value("keepsave") != NULL)
		nohold &= ~MSAVED;
	for (mp = &message[0]; mp < &message[msgCount]; mp++) {
		if (mp->m_flag & MNEW) {
			mp->m_flag &= ~MNEW;
			mp->m_flag |= MSTATUS;
		}
		if (mp->m_flag & MSTATUS)
			anystat++;
		if ((mp->m_flag & MTOUCH) == 0)
			mp->m_flag |= MPRESERVE;
		if ((mp->m_flag & nohold) == 0)
			mp->m_flag |= holdbit;
	}
	modify = 0;
	if (Tflag != NULL) {
		if ((readstat = Fopen(Tflag, "w")) == NULL)
			Tflag = NULL;
	}
	for (c = 0, p = 0, mp = &message[0]; mp < &message[msgCount]; mp++) {
		if (mp->m_flag & MBOX)
			c++;
		if (mp->m_flag & MPRESERVE)
			p++;
		if (mp->m_flag & MODIFY)
			modify++;
		if (Tflag != NULL && (mp->m_flag & (MREAD|MDELETED)) != 0) {
			char *id;

			if ((id = hfield("article-id", mp)) != NULL)
				fprintf(readstat, "%s\n", id);
		}
	}
	if (Tflag != NULL)
		(void)Fclose(readstat);
	if (p == msgCount && !modify && !anystat) {
		printf("Held %d message%s in %s\n",
			p, p == 1 ? "" : "s", mailname);
		(void)Fclose(fbuf);
		spool_unlock();
		return(0);
	}
	if (c == 0) {
		if (p != 0) {
			writeback(rbuf);
			(void)Fclose(fbuf);
			spool_unlock();
			return(0);
		}
		goto cream;
	}

	/*
	 * Create another temporary file and copy user's mbox file
	 * darin.  If there is no mbox, copy nothing.
	 * If he has specified "append" don't copy his mailbox,
	 * just copy saveable entries at the end.
	 */
	mbox = expand("&");
	mcount = c;
	if (value("append") == NULL) {
		(void)snprintf(tempname, sizeof(tempname),
		    "%s/mail.RmXXXXXXXXXX", tmpdir);
		if ((fd = mkstemp(tempname)) == -1 ||
		    (obuf = Fdopen(fd, "w")) == NULL) {
			warn("%s", tempname);
			(void)Fclose(fbuf);
			spool_unlock();
			return(-1);
		}
		if ((ibuf = Fopen(tempname, "r")) == NULL) {
			warn("%s", tempname);
			(void)rm(tempname);
			(void)Fclose(obuf);
			(void)Fclose(fbuf);
			spool_unlock();
			return(-1);
		}
		(void)rm(tempname);
		if ((abuf = Fopen(mbox, "r")) != NULL) {
			while ((c = getc(abuf)) != EOF)
				(void)putc(c, obuf);
			(void)Fclose(abuf);
		}
		if (ferror(obuf)) {
			warn("%s", tempname);
			(void)Fclose(ibuf);
			(void)Fclose(obuf);
			(void)Fclose(fbuf);
			spool_unlock();
			return(-1);
		}
		(void)Fclose(obuf);
		(void)close(creat(mbox, 0600));
		if ((obuf = Fopen(mbox, "r+")) == NULL) {
			warn("%s", mbox);
			(void)Fclose(ibuf);
			(void)Fclose(fbuf);
			spool_unlock();
			return(-1);
		}
	} else {
		if ((obuf = Fopen(mbox, "a")) == NULL) {
			warn("%s", mbox);
			(void)Fclose(fbuf);
			spool_unlock();
			return(-1);
		}
		fchmod(fileno(obuf), 0600);
	}
	for (mp = &message[0]; mp < &message[msgCount]; mp++)
		if (mp->m_flag & MBOX)
			if (sendmessage(mp, obuf, saveignore, NULL) < 0) {
				warn("%s", mbox);
				(void)Fclose(ibuf);
				(void)Fclose(obuf);
				(void)Fclose(fbuf);
				spool_unlock();
				return(-1);
			}

	/*
	 * Copy the user's old mbox contents back
	 * to the end of the stuff we just saved.
	 * If we are appending, this is unnecessary.
	 */
	if (value("append") == NULL) {
		rewind(ibuf);
		c = getc(ibuf);
		while (c != EOF) {
			(void)putc(c, obuf);
			if (ferror(obuf))
				break;
			c = getc(ibuf);
		}
		(void)Fclose(ibuf);
		fflush(obuf);
	}
	trunc(obuf);
	if (ferror(obuf)) {
		warn("%s", mbox);
		(void)Fclose(obuf);
		(void)Fclose(fbuf);
		spool_unlock();
		return(-1);
	}
	(void)Fclose(obuf);
	if (mcount == 1)
		puts("Saved 1 message in mbox");
	else
		printf("Saved %d messages in mbox\n", mcount);

	/*
	 * Now we are ready to copy back preserved files to
	 * the system mailbox, if any were requested.
	 */
	if (p != 0) {
		writeback(rbuf);
		(void)Fclose(fbuf);
		spool_unlock();
		return(0);
	}

	/*
	 * Finally, remove his /var/mail file.
	 * If new mail has arrived, copy it back.
	 */
cream:
	if (rbuf != NULL) {
		abuf = Fopen(mailname, "r+");
		if (abuf == NULL)
			goto newmail;
		while ((c = getc(rbuf)) != EOF)
			(void)putc(c, abuf);
		(void)Fclose(rbuf);
		trunc(abuf);
		(void)Fclose(abuf);
		alter(mailname);
		(void)Fclose(fbuf);
		spool_unlock();
		return(0);
	}
	demail();
	(void)Fclose(fbuf);
	spool_unlock();
	return(0);

newmail:
	puts("Thou hast new mail.");
	if (fbuf != NULL) {
		(void)Fclose(fbuf);
		spool_unlock();
	}
	return(0);
}

/*
 * Preserve all the appropriate messages back in the system
 * mailbox, and print a nice message indicated how many were
 * saved.  On any error, just return -1.  Else return 0.
 * Incorporate the any new mail that we found.
 */
int
writeback(FILE *res)
{
	struct message *mp;
	int p, c;
	FILE *obuf;

	p = 0;
	if ((obuf = Fopen(mailname, "r+")) == NULL) {
		warn("%s", mailname);
		return(-1);
	}
#ifndef APPEND
	if (res != NULL)
		while ((c = getc(res)) != EOF)
			(void)putc(c, obuf);
#endif
	for (mp = &message[0]; mp < &message[msgCount]; mp++)
		if ((mp->m_flag&MPRESERVE)||(mp->m_flag&MTOUCH)==0) {
			p++;
			if (sendmessage(mp, obuf, NULL, NULL) < 0) {
				warn("%s", mailname);
				(void)Fclose(obuf);
				return(-1);
			}
		}
#ifdef APPEND
	if (res != NULL)
		while ((c = getc(res)) != EOF)
			(void)putc(c, obuf);
#endif
	fflush(obuf);
	trunc(obuf);
	if (ferror(obuf)) {
		warn("%s", mailname);
		(void)Fclose(obuf);
		return(-1);
	}
	if (res != NULL)
		(void)Fclose(res);
	(void)Fclose(obuf);
	alter(mailname);
	if (p == 1)
		printf("Held 1 message in %s\n", mailname);
	else
		printf("Held %d messages in %s\n", p, mailname);
	return(0);
}

/*
 * Terminate an editing session by attempting to write out the user's
 * file from the temporary.  Save any new stuff appended to the file.
 */
int
edstop(void)
{
	int gotcha, c;
	struct message *mp;
	FILE *obuf, *ibuf, *readstat = NULL;
	struct stat statb;
	char tempname[PATHSIZE];

	if (readonly)
		return(0);
	holdsigs();
	if (Tflag != NULL) {
		if ((readstat = Fopen(Tflag, "w")) == NULL)
			Tflag = NULL;
	}
	for (mp = &message[0], gotcha = 0; mp < &message[msgCount]; mp++) {
		if (mp->m_flag & MNEW) {
			mp->m_flag &= ~MNEW;
			mp->m_flag |= MSTATUS;
		}
		if (mp->m_flag & (MODIFY|MDELETED|MSTATUS))
			gotcha++;
		if (Tflag != NULL && (mp->m_flag & (MREAD|MDELETED)) != 0) {
			char *id;

			if ((id = hfield("article-id", mp)) != NULL)
				fprintf(readstat, "%s\n", id);
		}
	}
	if (Tflag != NULL)
		(void)Fclose(readstat);
	if (!gotcha || Tflag != NULL)
		goto done;
	ibuf = NULL;
	if (stat(mailname, &statb) >= 0 && statb.st_size > mailsize) {
		int fd;

		(void)snprintf(tempname, sizeof(tempname), "%s/mbox.XXXXXXXXXX",
		    tmpdir);
		if ((fd = mkstemp(tempname)) == -1 ||
		    (obuf = Fdopen(fd, "w")) == NULL) {
			warn("%s", tempname);
			if (fd != -1)
				close(fd);
			relsesigs();
			return(-1);
		}
		if ((ibuf = Fopen(mailname, "r")) == NULL) {
			warn("%s", mailname);
			(void)Fclose(obuf);
			(void)rm(tempname);
			relsesigs();
			return(-1);
		}
		fseek(ibuf, (long)mailsize, SEEK_SET);
		while ((c = getc(ibuf)) != EOF)
			(void)putc(c, obuf);
		(void)Fclose(ibuf);
		(void)Fclose(obuf);
		if ((ibuf = Fopen(tempname, "r")) == NULL) {
			warn("%s", tempname);
			(void)rm(tempname);
			relsesigs();
			return(-1);
		}
		(void)rm(tempname);
	}
	printf("\"%s\" ", mailname);
	fflush(stdout);
	if ((obuf = Fopen(mailname, "r+")) == NULL) {
		warn("%s", mailname);
		relsesigs();
		return(-1);
	}
	trunc(obuf);
	c = 0;
	for (mp = &message[0]; mp < &message[msgCount]; mp++) {
		if ((mp->m_flag & MDELETED) != 0)
			continue;
		c++;
		if (sendmessage(mp, obuf, NULL, NULL) < 0) {
			warn("%s", mailname);
			relsesigs();
			return(-1);
		}
	}
	gotcha = (c == 0 && ibuf == NULL);
	if (ibuf != NULL) {
		while ((c = getc(ibuf)) != EOF)
			(void)putc(c, obuf);
		(void)Fclose(ibuf);
	}
	fflush(obuf);
	if (ferror(obuf)) {
		warn("%s", mailname);
		relsesigs();
		return(-1);
	}
	(void)Fclose(obuf);
	if (gotcha) {
		(void)rm(mailname);
		puts("removed");
	} else
		puts("complete");
	fflush(stdout);

done:
	relsesigs();
	return(0);
}