/*      $NetBSD: edit.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[] = "@(#)edit.c      8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: edit.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"

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

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

        (void)snprintf(tempname, sizeof(tempname),
            "%s/mail.ReXXXXXXXXXX", tmpdir);
        if ((t = mkstemp(tempname)) == -1) {
                warn("%s", tempname);
                goto out;
        }
        if (readonlyflag && fchmod(t, 0400) == -1) {
                (void)close(t);
                warn("%s", tempname);
                (void)unlink(tempname);
                goto out;
        }
        if ((nf = Fdopen(t, "wef")) == NULL) {
                (void)close(t);
                warn("%s", tempname);
                (void)unlink(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 (ferror(nf)) {
                (void)Fclose(nf);
                warn("%s", tempname);
                (void)unlink(tempname);
                nf = NULL;
                goto out;
        }
        if (fstat(fileno(nf), &statb) < 0)
                modtime = 0;
        else
                modtime = statb.st_mtime;
        if (Fclose(nf) < 0) {
                warn("%s", tempname);
                (void)unlink(tempname);
                nf = NULL;
                goto out;
        }
        nf = NULL;
        editcmd = value(editortype == 'e' ? ENAME_EDITOR : ENAME_VISUAL);
        if (editcmd == NULL)
                editcmd = editortype == 'e' ? _PATH_EX : _PATH_VI;
        if (run_command(editcmd, NULL, 0, -1, tempname, NULL) < 0) {
                (void)unlink(tempname);
                goto out;
        }
        /*
         * If in read only mode or file unchanged, just remove the editor
         * temporary and return.
         */
        if (readonlyflag) {
                (void)unlink(tempname);
                goto out;
        }
        if (stat(tempname, &statb) < 0) {
                warn("%s", tempname);
                goto out;
        }
        if (modtime == statb.st_mtime) {
                (void)unlink(tempname);
                goto out;
        }
        /*
         * Now switch to new file.
         */
        if ((nf = Fopen(tempname, "aef+")) == NULL) {
                warn("%s", tempname);
                (void)unlink(tempname);
                goto out;
        }
        (void)unlink(tempname);
out:
        return nf;
}

/*
 * 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.
 */
static int
edit1(int *msgvec, int editortype)
{
        int c;
        int i;
        int msgCount;
        FILE *fp;
        struct message *mp;
        off_t size;

        /*
         * Deal with each message to be edited . . .
         */
        msgCount = get_msgCount();
        for (i = 0; i < msgCount && msgvec[i]; i++) {
                sigset_t oset;
                struct sigaction osa;

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

                        (void)printf("Edit message %d [ynq]? ", msgvec[i]);
                        if (fgets(buf, (int)sizeof(buf), stdin) == NULL)
                                break;
                        p = skip_WSP(buf);
                        if (*p == 'q')
                                break;
                        if (*p == 'n')
                                continue;
                }
                dot = mp = get_message(msgvec[i]);
                touch(mp);
                sig_check();
                (void)sig_ignore(SIGINT, &osa, &oset);
                fp = run_editor(setinput(mp), mp->m_size, editortype,
                                readonly);
                if (fp != NULL) {
                        (void)fseek(otf, 0L, 2);
                        size = ftell(otf);
                        mp->m_block = blockof(size);
                        mp->m_offset = blkoffsetof(size);
                        mp->m_size = fsize(fp);
                        mp->m_lines = 0;
                        mp->m_blines = 0;
                        mp->m_flag |= MMODIFY;
                        rewind(fp);
                        while ((c = getc(fp)) != EOF) {
                                /*
                                 * XXX. if you edit a message, we treat
                                 * header lines as body lines in the recount.
                                 * This is because the original message copy
                                 * and the edit reread use different code to
                                 * count the lines, and this one here is
                                 * simple-minded.
                                 */
                                if (c == '\n') {
                                        mp->m_lines++;
                                        mp->m_blines++;
                                }
                                if (putc(c, otf) == EOF)
                                        break;
                        }
                        if (ferror(otf))
                                warn("/tmp");
                        (void)Fclose(fp);
                }
                (void)sig_restore(SIGINT, &osa, &oset);
                sig_check();
        }
        return 0;
}

/*
 * Edit a message list.
 */
PUBLIC int
editor(void *v)
{
        int *msgvec = v;

        return edit1(msgvec, 'e');
}

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

        return edit1(msgvec, 'v');
}