/*      $NetBSD: quit.c,v 1.29 2017/11/09 20:27:50 christos 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 <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)quit.c      8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: quit.c,v 1.29 2017/11/09 20:27:50 christos Exp $");
#endif
#endif /* not lint */

#include "rcv.h"
#include "extern.h"
#include "thread.h"
#include "sig.h"

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

/*
 * The "quit" command.
 */
/*ARGSUSED*/
PUBLIC int
quitcmd(void *v __unused)
{
        /*
         * 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;
}

/*
 * 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.
 */
static int
writeback(FILE *res)
{
        struct message *mp;
        int p, c;
        FILE *obuf;

        p = 0;
        if ((obuf = Fopen(mailname, "ref+")) == NULL) {
                warn("%s", mailname);
                return -1;
        }
#ifndef APPEND
        if (res != NULL) {
                while ((c = getc(res)) != EOF)
                        (void)putc(c, obuf);
                (void)fflush(obuf);
                if (ferror(obuf)) {
                        warn("%s", mailname);
                        (void)Fclose(obuf);
                        return -1;
                }
        }
#endif
        for (mp = get_message(1); mp; mp = next_message(mp))
                if ((mp->m_flag & MPRESERVE) || (mp->m_flag & MTOUCH)==0) {
                        p++;
                        if (sendmessage(mp, obuf, NULL, 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
        (void)fflush(obuf);
        if (!ferror(obuf))
                trunc(obuf);    /* XXX or should we truncate? */
        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)
                (void)printf("Held 1 message in %s\n", mailname);
        else
                (void)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.
 */
static void
edstop(jmp_buf jmpbuf)
{
        int gotcha, c;
        struct message *mp;
        FILE *obuf;
        FILE *ibuf;
        FILE *readstat;
        struct stat statb;
        char tempname[PATHSIZE];
        int fd;

        sig_check();
        if (readonly)
                return;

        readstat = NULL;
        if (Tflag != NULL) {
                if ((readstat = Fopen(Tflag, "wef")) == NULL)
                        Tflag = NULL;
        }
        for (mp = get_message(1), gotcha = 0; mp; mp = next_message(mp)) {
                if (mp->m_flag & MNEW) {
                        mp->m_flag &= ~MNEW;
                        mp->m_flag |= MSTATUS;
                }
                if (mp->m_flag & (MMODIFY|MDELETED|MSTATUS))
                        gotcha++;
                if (Tflag != NULL && (mp->m_flag & (MREAD|MDELETED)) != 0) {
                        char *id;

                        if ((id = hfield("article-id", mp)) != NULL)
                                (void)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) {
                (void)snprintf(tempname, sizeof(tempname),
                    "%s/mbox.XXXXXXXXXX", tmpdir);
                if ((fd = mkstemp(tempname)) == -1 ||
                    (obuf = Fdopen(fd, "wef")) == NULL) {
                        warn("%s", tempname);
                        if (fd != -1)
                                (void)close(fd);
                        sig_release();
                        longjmp(jmpbuf, -11);
                }
                if ((ibuf = Fopen(mailname, "ref")) == NULL) {
                        warn("%s", mailname);
                        (void)Fclose(obuf);
                        (void)rm(tempname);
                        sig_release();
                        longjmp(jmpbuf, -1);
                }
                (void)fseek(ibuf, (long)mailsize, 0);
                while ((c = getc(ibuf)) != EOF)
                        (void)putc(c, obuf);
                (void)fflush(obuf);
                if (ferror(obuf)) {
                        warn("%s", tempname);
                        (void)Fclose(obuf);
                        (void)Fclose(ibuf);
                        (void)rm(tempname);
                        sig_release();
                        longjmp(jmpbuf, -1);
                }
                (void)Fclose(ibuf);
                (void)Fclose(obuf);
                if ((ibuf = Fopen(tempname, "ref")) == NULL) {
                        warn("%s", tempname);
                        (void)rm(tempname);
                        sig_release();
                        longjmp(jmpbuf, -1);
                }
                (void)rm(tempname);
        }
        (void)printf("\"%s\" ", mailname);
        (void)fflush(stdout);
        if ((obuf = Fopen(mailname, "ref+")) == NULL) {
                warn("%s", mailname);
                sig_release();
                longjmp(jmpbuf, -1);
        }
        trunc(obuf);
        c = 0;
        for (mp = get_message(1); mp; mp = next_message(mp)) {
                if ((mp->m_flag & MDELETED) != 0)
                        continue;
                c++;
                if (sendmessage(mp, obuf, NULL, NULL, NULL) < 0) {
                        warn("%s", mailname);
                        sig_release();
                        longjmp(jmpbuf, -1);
                }
        }
        gotcha = (c == 0 && ibuf == NULL);
        if (ibuf != NULL) {
                while ((c = getc(ibuf)) != EOF)
                        (void)putc(c, obuf);
                (void)Fclose(ibuf);
        }
        (void)fflush(obuf);
        if (ferror(obuf)) {
                warn("%s", mailname);
                sig_release();
                longjmp(jmpbuf, -1);
        }
        (void)Fclose(obuf);
        if (gotcha) {
                (void)rm(mailname);
                (void)printf("removed\n");
        } else
                (void)printf("complete\n");
        (void)fflush(stdout);

done:
        sig_release();
        sig_check();
}

/*
 * 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.
 */
PUBLIC void
quit(jmp_buf jmpbuf)
{
        int mcount, p, modify, autohold, anystat, holdbit, nohold;
        _Bool append;
        FILE *ibuf, *obuf, *fbuf, *rbuf, *readstat, *abuf;
        struct message *mp;
        int c, fd;
        struct stat minfo;
        const char *mbox;
        char tempname[PATHSIZE];

#ifdef __GNUC__         /* XXX gcc -Wuninitialized */
        ibuf = NULL;
        readstat = NULL;
#endif
        /*
         * If we are read only, we can't do anything,
         * so just return quickly.
         */
        if (readonly)
                return;

#ifdef THREAD_SUPPORT
        (void)showtagscmd(NULL);        /* make sure we see tagged messages */
        (void)unthreadcmd(NULL);
#endif
        /*
         * If editing (not reading system mail box), then do the work
         * in edstop()
         */
        if (edit) {
                edstop(jmpbuf);
                return;
        }

        /*
         * 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, "ref");
        if (fbuf == NULL)
                goto newmail;
        if (flock(fileno(fbuf), LOCK_EX) == -1) {
nolock:
                warn("Unable to lock mailbox");
                (void)Fclose(fbuf);
                return;
        }
        if (dot_lock(mailname, 1, stdout, ".") == -1)
                goto nolock;
        rbuf = NULL;
        if (fstat(fileno(fbuf), &minfo) >= 0 && minfo.st_size > mailsize) {
                (void)printf("New mail has arrived.\n");
                (void)snprintf(tempname, sizeof(tempname),
                    "%s/mail.RqXXXXXXXXXX", tmpdir);
                if ((fd = mkstemp(tempname)) == -1 ||
                    (rbuf = Fdopen(fd, "wef")) == NULL) {
                        if (fd != -1)
                                (void)close(fd);
                        goto newmail;
                }
#ifdef APPEND
                (void)fseek(fbuf, (long)mailsize, 0);
                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)fflush(rbuf);
                if (ferror(rbuf)) {
                        warn("%s", tempname);
                        (void)Fclose(rbuf);
                        (void)Fclose(fbuf);
                        dot_unlock(mailname);
                        return;
                }
                (void)Fclose(rbuf);
                if ((rbuf = Fopen(tempname, "ref")) == NULL)
                        goto newmail;
                (void)rm(tempname);
        }

        /*
         * Adjust the message flags in each message.
         */

        anystat = 0;
        autohold = value(ENAME_HOLD) != NULL;
        holdbit = autohold ? MPRESERVE : MBOX;
        nohold = MBOX|MSAVED|MDELETED|MPRESERVE;
        if (value(ENAME_KEEPSAVE) != NULL)
                nohold &= ~MSAVED;
        for (mp = get_message(1); mp; mp = next_message(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, "wef")) == NULL)
                        Tflag = NULL;
        }
        for (c = 0, p = 0, mp = get_message(1); mp; mp = next_message(mp)) {
                if (mp->m_flag & MBOX)
                        c++;
                if (mp->m_flag & MPRESERVE)
                        p++;
                if (mp->m_flag & MMODIFY)
                        modify++;
                if (Tflag != NULL && (mp->m_flag & (MREAD|MDELETED)) != 0) {
                        char *id;

                        if ((id = hfield("article-id", mp)) != NULL)
                                (void)fprintf(readstat, "%s\n", id);
                }
        }
        if (Tflag != NULL)
                (void)Fclose(readstat);
        if (p == get_msgCount() && !modify && !anystat) {
                (void)printf("Held %d message%s in %s\n",
                        p, p == 1 ? "" : "s", mailname);
                (void)Fclose(fbuf);
                dot_unlock(mailname);
                return;
        }
        if (c == 0) {
                if (p != 0) {
                        (void)writeback(rbuf);
                        (void)Fclose(fbuf);
                        dot_unlock(mailname);
                        return;
                }
                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;
        append = value(ENAME_APPEND) != NULL;
        if (!append) {
                (void)snprintf(tempname, sizeof(tempname),
                    "%s/mail.RmXXXXXXXXXX", tmpdir);
                if ((fd = mkstemp(tempname)) == -1 ||
                    (obuf = Fdopen(fd, "wef")) == NULL) {
                        warn("%s", tempname);
                        if (fd != -1)
                                (void)close(fd);
                        (void)Fclose(fbuf);
                        dot_unlock(mailname);
                        return;
                }
                if ((ibuf = Fopen(tempname, "ref")) == NULL) {
                        warn("%s", tempname);
                        (void)rm(tempname);
                        (void)Fclose(obuf);
                        (void)Fclose(fbuf);
                        dot_unlock(mailname);
                        return;
                }
                (void)rm(tempname);
                if ((abuf = Fopen(mbox, "ref")) != 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);
                        dot_unlock(mailname);
                        return;
                }
                (void)Fclose(obuf);
                if ((fd = creat(mbox, 0600)) != -1)
                        (void)close(fd);
                if ((obuf = Fopen(mbox, "ref+")) == NULL) {
                        warn("%s", mbox);
                        (void)Fclose(ibuf);
                        (void)Fclose(fbuf);
                        dot_unlock(mailname);
                        return;
                }
        }
        else {
                if ((obuf = Fopen(mbox, "aef")) == NULL) {
                        warn("%s", mbox);
                        (void)Fclose(fbuf);
                        dot_unlock(mailname);
                        return;
                }
                (void)fchmod(fileno(obuf), 0600);
        }
        for (mp = get_message(1); mp; mp = next_message(mp))
                if (mp->m_flag & MBOX)
                        if (sendmessage(mp, obuf, saveignore, NULL, NULL) < 0) {
                                warn("%s", mbox);
                                if (!append)
                                        (void)Fclose(ibuf);
                                (void)Fclose(obuf);
                                (void)Fclose(fbuf);
                                dot_unlock(mailname);
                                return;
                        }

        /*
         * 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 (!append) {
                rewind(ibuf);
                c = getc(ibuf);
                while (c != EOF) {
                        (void)putc(c, obuf);
                        if (ferror(obuf))
                                break;
                        c = getc(ibuf);
                }
                (void)Fclose(ibuf);
        }
        (void)fflush(obuf);
        if (!ferror(obuf))
                trunc(obuf);    /* XXX or should we truncate? */
        if (ferror(obuf)) {
                warn("%s", mbox);
                (void)Fclose(obuf);
                (void)Fclose(fbuf);
                dot_unlock(mailname);
                return;
        }
        (void)Fclose(obuf);
        if (mcount == 1)
                (void)printf("Saved 1 message in mbox\n");
        else
                (void)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) {
                (void)writeback(rbuf);
                (void)Fclose(fbuf);
                dot_unlock(mailname);
                return;
        }

        /*
         * Finally, remove his /var/mail file.
         * If new mail has arrived, copy it back.
         */

cream:
        if (rbuf != NULL) {
                abuf = Fopen(mailname, "ref+");
                if (abuf == NULL)
                        goto newmail;
                while ((c = getc(rbuf)) != EOF)
                        (void)putc(c, abuf);
                (void)fflush(abuf);
                if (ferror(abuf)) {
                        warn("%s", mailname);
                        (void)Fclose(abuf);
                        (void)Fclose(fbuf);
                        dot_unlock(mailname);
                        return;
                }
                (void)Fclose(rbuf);
                trunc(abuf);
                (void)Fclose(abuf);
                alter(mailname);
                (void)Fclose(fbuf);
                dot_unlock(mailname);
                return;
        }
        demail();
        (void)Fclose(fbuf);
        dot_unlock(mailname);
        return;

newmail:
        (void)printf("Thou hast new mail.\n");
        if (fbuf != NULL) {
                (void)Fclose(fbuf);
                dot_unlock(mailname);
        }
}