/*-
 * 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
 *
 * Startup -- interface with user.
 */
int     msgCount;
int     rcvmode;
int     sawcom;
char    *Tflag;
int     senderr;
int     edit;
int     readonly;
int     noreset;
int     sourcing;
int     loading;
int     cond;
FILE    *itf;
FILE    *otf;
int     image;
FILE    *input;
char    mailname[PATHSIZE];
char    prevfile[PATHSIZE];
char    *homedir;
char    *myname;
off_t   mailsize;
int     lexnumber;
char    lexstring[STRINGLEN];
int     regretp;
int     regretstack[REGDEP];
char    *string_stack[REGDEP];
int     numberstack[REGDEP];
struct  message *dot;
struct  message *message;
struct  var     *variables[HSHSIZE];
struct  grouphead       *groups[HSHSIZE];
struct  ignoretab       ignore[2];

struct  ignoretab       saveignore[2];

struct  ignoretab       ignoreall[2];
char    **altnames;
int     debug;
int     screenwidth;
int     screenheight;

int     realscreenheight;

jmp_buf srbuf;

static jmp_buf  hdrjmp;

extern const char *version;

int
main(int argc, char *argv[])
{
        int i;
        struct name *to, *cc, *bcc, *smopts;
        char *subject, *replyto;
        char *ef, *rc;
        char nosrc = 0;
        sig_t prevint;

        /*
         * Set up a reasonable environment.
         * Figure out whether we are being run interactively,
         * start the SIGCHLD catcher, and so forth.
         */
        (void)signal(SIGCHLD, sigchild);
        if (isatty(0))
                assign("interactive", "");
        image = -1;
        /*
         * Now, determine how we are being used.
         * We successively pick off - flags.
         * If there is anything left, it is the base of the list
         * of users to mail to.  Argp will be set to point to the
         * first of these users.
         */
        ef = NULL;
        to = NULL;
        cc = NULL;
        bcc = NULL;
        smopts = NULL;
        subject = NULL;
        while ((i = getopt(argc, argv, "FEHINT:b:c:edfins:u:v")) != -1) {
                switch (i) {
                case 'T':
                        /*
                         * Next argument is temp file to write which
                         * articles have been read/deleted for netnews.
                         */
                        Tflag = optarg;
                        if ((i = open(Tflag, O_CREAT | O_TRUNC | O_WRONLY,
                            0600)) < 0)
                                err(1, "%s", Tflag);
                        (void)close(i);
                        break;
                case 'u':
                        /*
                         * Next argument is person to pretend to be.
                         */
                        myname = optarg;
                        unsetenv("MAIL");
                        break;
                case 'i':
                        /*
                         * User wants to ignore interrupts.
                         * Set the variable "ignore"
                         */
                        assign("ignore", "");
                        break;
                case 'd':
                        debug++;
                        break;
                case 'e':
                        /*
                         * User wants to check mail and exit.
                         */
                        assign("checkmode", "");
                        break;
                case 'H':
                        /*
                         * User wants a header summary only.
                         */
                        assign("headersummary", "");
                        break;
                case 'F':
                        /*
                         * User wants to record messages to files
                         * named after first recipient username.
                         */
                        assign("recordrecip", "");
                        break;
                case 's':
                        /*
                         * Give a subject field for sending from
                         * non terminal
                         */
                        subject = optarg;
                        break;
                case 'f':
                        /*
                         * User is specifying file to "edit" with Mail,
                         * as opposed to reading system mailbox.
                         * If no argument is given after -f, we read his
                         * mbox file.
                         *
                         * getopt() can't handle optional arguments, so here
                         * is an ugly hack to get around it.
                         */
                        if ((argv[optind] != NULL) && (argv[optind][0] != '-'))
                                ef = argv[optind++];
                        else
                                ef = "&";
                        break;
                case 'n':
                        /*
                         * User doesn't want to source /usr/lib/Mail.rc
                         */
                        nosrc++;
                        break;
                case 'N':
                        /*
                         * Avoid initial header printing.
                         */
                        assign("noheader", "");
                        break;
                case 'v':
                        /*
                         * Send mailer verbose flag
                         */
                        assign("verbose", "");
                        break;
                case 'I':
                        /*
                         * We're interactive
                         */
                        assign("interactive", "");
                        break;
                case 'c':
                        /*
                         * Get Carbon Copy Recipient list
                         */
                        cc = cat(cc, nalloc(optarg, GCC));
                        break;
                case 'b':
                        /*
                         * Get Blind Carbon Copy Recipient list
                         */
                        bcc = cat(bcc, nalloc(optarg, GBCC));
                        break;
                case 'E':
                        /*
                         * Don't send empty files.
                         */
                        assign("dontsendempty", "");
                        break;
                case '?':
                        fprintf(stderr, "\
Usage: %s [-dEiInv] [-s subject] [-c cc-addr] [-b bcc-addr] [-F] to-addr ...\n\
       %*s [-sendmail-option ...]\n\
       %s [-dEHiInNv] [-F] -f [name]\n\
       %s [-dEHiInNv] [-F] [-u user]\n\
       %s [-d] -e [-f name]\n", __progname, (int)strlen(__progname), "",
                                __progname, __progname, __progname);
                        exit(1);
                }
        }
        for (i = optind; (argv[i] != NULL) && (*argv[i] != '-'); i++)
                to = cat(to, nalloc(argv[i], GTO));
        for (; argv[i] != NULL; i++)
                smopts = cat(smopts, nalloc(argv[i], 0));
        /*
         * Check for inconsistent arguments.
         */
        if (to == NULL && (subject != NULL || cc != NULL || bcc != NULL))
                errx(1, "You must specify direct recipients with -s, -c, or -b.");
        if (ef != NULL && to != NULL)
                errx(1, "Cannot give -f and people to send to.");
        tinit();
        setscreensize();
        input = stdin;
        rcvmode = !to;
        spreserve();
        if (!nosrc) {
                char *s, *path_rc;

                if ((path_rc = malloc(sizeof(_PATH_MASTER_RC))) == NULL)
                        err(1, "malloc(path_rc) failed");

                strcpy(path_rc, _PATH_MASTER_RC);
                while ((s = strsep(&path_rc, ":")) != NULL)
                        if (*s != '\0')
                                load(s);
        }
        /*
         * Expand returns a savestr, but load only uses the file name
         * for fopen, so it's safe to do this.
         */
        if ((rc = getenv("MAILRC")) == NULL)
                rc = "~/.mailrc";
        load(expand(rc));

        replyto = value("REPLYTO");
        if (!rcvmode) {
                mail(to, cc, bcc, smopts, subject, replyto);
                /*
                 * why wait?
                 */
                exit(senderr);
        }

        if(value("checkmode") != NULL) {
                if (ef == NULL)
                        ef = "%";
                if (setfile(ef) <= 0)
                        /* Either an error has occurred, or no mail */
                        exit(1);
                else
                        exit(0);
                /* NOTREACHED */
        }

        /*
         * Ok, we are reading mail.
         * Decide whether we are editing a mailbox or reading
         * the system mailbox, and open up the right stuff.
         */
        if (ef == NULL)
                ef = "%";
        if (setfile(ef) < 0)
                exit(1);                /* error already reported */
        if (setjmp(hdrjmp) == 0) {
                if ((prevint = signal(SIGINT, SIG_IGN)) != SIG_IGN)
                        (void)signal(SIGINT, hdrstop);
                if (value("quiet") == NULL)
                        printf("Mail version %s.  Type ? for help.\n",
                                version);
                announce();
                (void)fflush(stdout);
                (void)signal(SIGINT, prevint);
        }

        /* If we were in header summary mode, it's time to exit. */
        if (value("headersummary") != NULL)
                exit(0);

        commands();
        (void)signal(SIGHUP, SIG_IGN);
        (void)signal(SIGINT, SIG_IGN);
        (void)signal(SIGQUIT, SIG_IGN);
        quit();
        exit(0);
}

/*
 * Interrupt printing of the headers.
 */
/*ARGSUSED*/
void
hdrstop(int signo __unused)
{

        (void)fflush(stdout);
        fprintf(stderr, "\nInterrupt\n");
        longjmp(hdrjmp, 1);
}

/*
 * Compute what the screen size for printing headers should be.
 * We use the following algorithm for the height:
 *      If baud rate < 1200, use  9
 *      If baud rate = 1200, use 14
 *      If baud rate > 1200, use 24 or ws_row
 * Width is either 80 or ws_col;
 */
void
setscreensize(void)
{
        struct termios tbuf;
        struct winsize ws;
        speed_t speed;

        if (ioctl(1, TIOCGWINSZ, (char *)&ws) < 0)
                ws.ws_col = ws.ws_row = 0;
        if (tcgetattr(1, &tbuf) < 0)
                speed = B9600;
        else
                speed = cfgetospeed(&tbuf);
        if (speed < B1200)
                screenheight = 9;
        else if (speed == B1200)
                screenheight = 14;
        else if (ws.ws_row != 0)
                screenheight = ws.ws_row;
        else
                screenheight = 24;
        if ((realscreenheight = ws.ws_row) == 0)
                realscreenheight = 24;
        if ((screenwidth = ws.ws_col) == 0)
                screenwidth = 80;
}