/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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"

/*
 * Mail -- a mail program
 *
 * Perform message editing functions.
 */

/*
 * Edit a message list.
 */
int
editor(void *msgvec)
{

        return (edit1(msgvec, 'e'));
}

/*
 * Invoke the visual editor on a message list.
 */
int
visual(void *msgvec)
{

        return (edit1(msgvec, 'v'));
}

/*
 * Edit a message by writing the message into a funnily-named file
 * (which should not exist) and forking an editor on it.
 * We get the editor from the stuff above.
 */
int
edit1(int *msgvec, int type)
{
        int c, i;
        FILE *fp;
        struct message *mp;
        off_t size;

        /*
         * Deal with each message to be edited . . .
         */
        for (i = 0; i < msgCount && msgvec[i]; i++) {
                sig_t sigint;

                if (i > 0) {
                        char buf[100];
                        char *p;

                        printf("Edit message %d [ynq]? ", msgvec[i]);
                        if (fgets(buf, sizeof(buf), stdin) == NULL)
                                break;
                        for (p = buf; *p == ' ' || *p == '\t'; p++)
                                ;
                        if (*p == 'q')
                                break;
                        if (*p == 'n')
                                continue;
                }
                dot = mp = &message[msgvec[i] - 1];
                touch(mp);
                sigint = signal(SIGINT, SIG_IGN);
                fp = run_editor(setinput(mp), mp->m_size, type, readonly);
                if (fp != NULL) {
                        (void)fseeko(otf, (off_t)0, SEEK_END);
                        size = ftello(otf);
                        mp->m_block = blockof(size);
                        mp->m_offset = boffsetof(size);
                        mp->m_size = (long)fsize(fp);
                        mp->m_lines = 0;
                        mp->m_flag |= MODIFY;
                        rewind(fp);
                        while ((c = getc(fp)) != EOF) {
                                if (c == '\n')
                                        mp->m_lines++;
                                if (putc(c, otf) == EOF)
                                        break;
                        }
                        if (ferror(otf))
                                warnx("/tmp");
                        (void)Fclose(fp);
                }
                (void)signal(SIGINT, sigint);
        }
        return (0);
}

/*
 * Run an editor on the file at "fpp" of "size" bytes,
 * and return a new file pointer.
 * Signals must be handled by the caller.
 * "Type" is 'e' for _PATH_EX, 'v' for _PATH_VI.
 */
FILE *
run_editor(FILE *fp, off_t size, int type, int readonly)
{
        FILE *nf = NULL;
        int t;
        time_t modtime;
        char *edit, tempname[PATHSIZE];
        struct stat statb;

        (void)snprintf(tempname, sizeof(tempname),
            "%s/mail.ReXXXXXXXXXX", tmpdir);
        if ((t = mkstemp(tempname)) == -1 ||
            (nf = Fdopen(t, "w")) == NULL) {
                warn("%s", tempname);
                goto out;
        }
        if (readonly && fchmod(t, 0400) == -1) {
                warn("%s", tempname);
                (void)rm(tempname);
                goto out;
        }
        if (size >= 0)
                while (--size >= 0 && (t = getc(fp)) != EOF)
                        (void)putc(t, nf);
        else
                while ((t = getc(fp)) != EOF)
                        (void)putc(t, nf);
        (void)fflush(nf);
        if (fstat(fileno(nf), &statb) < 0)
                modtime = 0;
        else
                modtime = statb.st_mtime;
        if (ferror(nf)) {
                (void)Fclose(nf);
                warnx("%s", tempname);
                (void)rm(tempname);
                nf = NULL;
                goto out;
        }
        if (Fclose(nf) < 0) {
                warn("%s", tempname);
                (void)rm(tempname);
                nf = NULL;
                goto out;
        }
        nf = NULL;
        if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
                edit = type == 'e' ? _PATH_EX : _PATH_VI;
        if (run_command(edit, 0, -1, -1, tempname, NULL) < 0) {
                (void)rm(tempname);
                goto out;
        }
        /*
         * If in read only mode or file unchanged, just remove the editor
         * temporary and return.
         */
        if (readonly) {
                (void)rm(tempname);
                goto out;
        }
        if (stat(tempname, &statb) < 0) {
                warn("%s", tempname);
                goto out;
        }
        if (modtime == statb.st_mtime) {
                (void)rm(tempname);
                goto out;
        }
        /*
         * Now switch to new file.
         */
        if ((nf = Fopen(tempname, "a+")) == NULL) {
                warn("%s", tempname);
                (void)rm(tempname);
                goto out;
        }
        (void)rm(tempname);
out:
        return (nf);
}