/*-
 * 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.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c	8.2 (Berkeley) 4/20/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#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;
}