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Major signal overhaul.  We no longer longjmp all over the place.
Instead, routines responsible to gathering user input (or in some
cases outputting data) catch the signals and set flags as needed.
Because of this some handlers are install without the SA_RESTART
flag so syscalls are not restarted and we can check the flag.  All
signal handlers are now safe.

This should make the flow of control a bit more grokable but the
code is still ugly.

/*	$OpenBSD: main.c,v 1.15 2001/11/20 20:50:00 millert Exp $	*/
/*	$NetBSD: main.c,v 1.7 1997/05/13 06:15:57 mikel 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 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";
#else
static char rcsid[] = "$OpenBSD: main.c,v 1.15 2001/11/20 20:50:00 millert Exp $";
#endif
#endif /* not lint */

#include "rcv.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include "extern.h"

int	main __P((int, char **));
__dead void usage __P((void));

/*
 * Mail -- a mail program
 *
 * Startup -- interface with user.
 */

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

	/*
	 * Set up a reasonable environment.
	 * Figure out whether we are being run interactively,
	 * start the SIGCHLD catcher, and so forth.
	 */
	(void)signal(SIGCHLD, sigchild);
	(void)signal(SIGPIPE, SIG_IGN);
	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 = NIL;
	cc = NIL;
	bcc = NIL;
	smopts = NIL;
	subject = NULL;
	while ((i = getopt(argc, argv, "INT:b:c:dfins: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 = creat(Tflag, 0600)) < 0)
				err(1, "%s", Tflag);
			(void)close(i);
			break;
		case 'u':
			/*
			 * Next argument is person to pretend to be.
			 */
			if (strlen(optarg) >= MAXLOGNAME)
				errx(1, "username `%s' too long", optarg);
			unsetenv("MAIL");
			myname = optarg;
			uflag = 1;
			break;
		case 'i':
			/*
			 * User wants to ignore interrupts.
			 * Set the variable "ignore"
			 */
			assign("ignore", "");
			break;
		case 'd':
			debug++;
			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]) && (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;
		default:
			usage();
			/*NOTREACHED*/
		}
	}
	for (i = optind; (argv[i]) && (*argv[i] != '-'); i++)
		to = cat(to, nalloc(argv[i], GTO));
	for (; argv[i]; i++)
		smopts = cat(smopts, nalloc(argv[i], 0));
	/*
	 * Check for inconsistent arguments.
	 */
	if (to == NIL && (subject != NULL || cc != NIL || bcc != NIL))
		errx(1, "You must specify direct recipients with -s, -c, or -b");
	if (ef != NULL && to != NIL)
		errx(1, "Cannot give -f and people to send to");
	/*
	 * Block SIGINT except where we install an explicit handler for it.
	 */
	sigemptyset(&intset);
	sigaddset(&intset, SIGINT);
	(void)sigprocmask(SIG_BLOCK, &intset, NULL);
	/*
	 * Initialization.
	 */
	tinit();
	setscreensize();
	input = stdin;
	rcvmode = !to;
	spreserve();
	if (!nosrc)
		load(_PATH_MASTER_RC);
	/*
	 * Expand returns a savestr, but load only uses the file name
	 * for fopen, so it's safe to do this.
	 */
	if ((rc = getenv("MAILRC")) == 0)
		rc = "~/.mailrc";
	load(expand(rc));
	if (!rcvmode) {
		mail(to, cc, bcc, smopts, subject);
		/*
		 * why wait?
		 */
		exit(senderr);
	}
	/*
	 * 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 (value("quiet") == NULL)
		(void)printf("Mail version %s.  Type ? for help.\n",
			version);
	announce();
	(void)fflush(stdout);
	commands();
	(void)ignoresig(SIGHUP, NULL, NULL);
	(void)ignoresig(SIGINT, NULL, NULL);
	(void)ignoresig(SIGQUIT, NULL, NULL);
	quit();
	exit(0);
}

/*
 * 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()
{
	struct termios tbuf;
	struct winsize ws;
	speed_t ospeed;

	if (ioctl(1, TIOCGWINSZ, (char *) &ws) < 0)
		ws.ws_col = ws.ws_row = 0;
	if (tcgetattr(1, &tbuf) < 0)
		ospeed = 9600;
	else
		ospeed = cfgetospeed(&tbuf);
	if (ospeed < B1200)
		screenheight = 9;
	else if (ospeed == 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;
}

__dead void
usage()
{

	fprintf(stderr, "usage: %s [-iInv] [-s subject] [-c cc-addr] "
	    "[-b bcc-addr] to-addr ...\n", __progname);
	fprintf(stderr, "       %*s [- sendmail-options ...]\n",
	    (int)strlen(__progname), "");
	fprintf(stderr, "       %s [-iInNv] -f [name]\n", __progname);
	fprintf(stderr, "       %s [-iInNv] [-u user]\n", __progname);
	exit(1);
}