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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: cmd1.c,v 1.20 2001/11/20 20:50:00 millert Exp $	*/
/*	$NetBSD: cmd1.c,v 1.9 1997/07/09 05:29:48 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
#if 0
static char sccsid[] = "@(#)cmd1.c	8.2 (Berkeley) 4/20/95";
#else
static char rcsid[] = "$OpenBSD: cmd1.c,v 1.20 2001/11/20 20:50:00 millert Exp $";
#endif
#endif /* not lint */

#include "rcv.h"
#include "extern.h"

/*
 * Mail -- a mail program
 *
 * User commands.
 */

/*
 * Print the current active headings.
 * Don't change dot if invoker didn't give an argument.
 */

static int screen;
static volatile sig_atomic_t gothdrint;

int
headers(v)
	void *v;
{
	int *msgvec = v;
	int n, mesg, flag, size;
	struct message *mp;
	struct sigaction act, oact;
	sigset_t oset;

	size = screensize();
	n = msgvec[0];
	if (n != 0)
		screen = (n-1)/size;
	if (screen < 0)
		screen = 0;
	mp = &message[screen * size];
	if (mp >= &message[msgCount])
		mp = &message[msgCount - size];
	if (mp < &message[0])
		mp = &message[0];
	flag = 0;
	mesg = mp - &message[0];
	if (dot != &message[n-1])
		dot = mp;
	sigemptyset(&act.sa_mask);
	act.sa_flags = SA_RESTART;
	act.sa_handler = hdrint;
	if (sigaction(SIGINT, NULL, &oact) == 0 &&
	    oact.sa_handler != SIG_IGN) {
		(void)sigaction(SIGINT, &act, &oact);
		(void)sigprocmask(SIG_UNBLOCK, &intset, &oset);
	}
	for (gothdrint = 0; !gothdrint && mp < &message[msgCount]; mp++) {
		mesg++;
		if (mp->m_flag & MDELETED)
			continue;
		if (flag++ >= size)
			break;
		printhead(mesg);
	}
	if (gothdrint) {
		fflush(stdout);
		fputs("\nInterrupt\n", stderr);
	}
	if (oact.sa_handler != SIG_IGN) {
		(void)sigprocmask(SIG_SETMASK, &oset, NULL);
		(void)sigaction(SIGINT, &oact, NULL);
	}
	if (flag == 0) {
		puts("No more mail.");
		return(1);
	}
	return(0);
}

/*
 * Scroll to the next/previous screen
 */
int
scroll(v)
	void *v;
{
	char *arg = v;
	int size, maxscreen;
	int cur[1];

	cur[0] = 0;
	size = screensize();
	maxscreen = (msgCount - 1) / size;
	switch (*arg) {
	case 0:
	case '+':
		if (screen >= maxscreen) {
			puts("On last screenful of messages");
			return(0);
		}
		screen++;
		break;

	case '-':
		if (screen <= 0) {
			puts("On first screenful of messages");
			return(0);
		}
		screen--;
		break;

	default:
		printf("Unrecognized scrolling command \"%s\"\n", arg);
		return(1);
	}
	return(headers(cur));
}

/*
 * Compute screen size.
 */
int
screensize()
{
	int s;
	char *cp;

	if ((cp = value("screen")) != NULL && (s = atoi(cp)) > 0)
		return(s);
	return(screenheight - 4);
}

/*
 * Print out the headlines for each message
 * in the passed message list.
 */
int
from(v)
	void *v;
{
	int *msgvec = v;
	int *ip;

	for (ip = msgvec; *ip != NULL; ip++)
		printhead(*ip);
	if (--ip >= msgvec)
		dot = &message[*ip - 1];
	return(0);
}

/*
 * Print out the header of a specific message.
 * This is a slight improvement to the standard one.
 */
void
printhead(mesg)
	int mesg;
{
	struct message *mp;
	char headline[LINESIZE], wcount[LINESIZE], *subjline, dispc, curind;
	char pbuf[BUFSIZ];
	struct headline hl;
	int subjlen;
	char *name;
	char *to, *from;
	struct name *np;
	char **ap;

	mp = &message[mesg-1];
	(void)readline(setinput(mp), headline, LINESIZE, NULL);
	if ((subjline = hfield("subject", mp)) == NULL)
		subjline = hfield("subj", mp);
	/*
	 * Bletch!
	 */
	curind = dot == mp ? '>' : ' ';
	dispc = ' ';
	if (mp->m_flag & MSAVED)
		dispc = '*';
	if (mp->m_flag & MPRESERVE)
		dispc = 'P';
	if ((mp->m_flag & (MREAD|MNEW)) == MNEW)
		dispc = 'N';
	if ((mp->m_flag & (MREAD|MNEW)) == 0)
		dispc = 'U';
	if (mp->m_flag & MBOX)
		dispc = 'M';
	parse(headline, &hl, pbuf);
	(void)snprintf(wcount, sizeof(wcount), "%4d/%-5d", mp->m_lines,
	    mp->m_size);
	subjlen = screenwidth - 44 - strlen(wcount);
	from = nameof(mp, 0);
	to = skin(hfield("to", mp));
	np = extract(from, GTO);
	np = delname(np, myname);
	if (altnames)
		for (ap = altnames; *ap; ap++)
			np = delname(np, *ap);
	if (np)
		/* not from me */
		name = value("show-rcpt") != NULL && to ? to : from;
	else
		/* from me - show TO */
		name = value("showto") != NULL && to ? to : from;
	if (subjline == NULL || subjlen < 0) { /* pretty pathetic */
		subjline="";
		subjlen=0;
	}
	if (name == to)
		printf("%c%c%3d TO %-14.14s  %16.16s %s %.*s\n",
			curind, dispc, mesg, name, hl.l_date, wcount,
			subjlen, subjline);
	else
		printf("%c%c%3d %-17.17s  %16.16s %s %.*s\n",
			curind, dispc, mesg, name, hl.l_date, wcount,
			subjlen, subjline);
}

/*
 * Print out the value of dot.
 */
int
pdot(v)
	void *v;
{
	printf("%d\n", (int)(dot - &message[0] + 1));
	return(0);
}

/*
 * Print out all the possible commands.
 */
int
pcmdlist(v)
	void *v;
{
	extern const struct cmd cmdtab[];
	const struct cmd *cp;
	int cc;

	puts("Commands are:");
	for (cc = 0, cp = cmdtab; cp->c_name != NULL; cp++) {
		cc += strlen(cp->c_name) + 2;
		if (cc > 72) {
			putchar('\n');
			cc = strlen(cp->c_name) + 2;
		}
		if ((cp+1)->c_name != NULL)
			printf("%s, ", cp->c_name);
		else
			puts(cp->c_name);
	}
	return(0);
}

/*
 * Pipe message to command
 */
int
pipeit(ml, sl)
	void *ml, *sl;
{
	int  *msgvec = ml;
	char *cmd    = sl;

	return(type1(msgvec, cmd, 0, 0));
}

/*
 * Paginate messages, honor ignored fields.
 */
int
more(v)
	void *v;
{
	int *msgvec = v;
	return(type1(msgvec, NULL, 1, 1));
}

/*
 * Paginate messages, even printing ignored fields.
 */
int
More(v)
	void *v;
{
	int *msgvec = v;

	return(type1(msgvec, NULL, 0, 1));
}

/*
 * Type out messages, honor ignored fields.
 */
int
type(v)
	void *v;
{
	int *msgvec = v;

	return(type1(msgvec, NULL, 1, 0));
}

/*
 * Type out messages, even printing ignored fields.
 */
int
Type(v)
	void *v;
{
	int *msgvec = v;

	return(type1(msgvec, NULL, 0, 0));
}

/*
 * Type out the messages requested.
 */
int
type1(msgvec, cmd, doign, page)
	int *msgvec;
	char *cmd;
	int doign, page;
{
	int nlines, *ip, restoreterm;
	struct message *mp;
	struct termios tbuf;
	char *cp;
	FILE *obuf;

	obuf = stdout;
	restoreterm = 0;

	/*
	 * start a pipe if needed.
	 */
	if (cmd) {
		restoreterm = (tcgetattr(fileno(stdin), &tbuf) == 0);
		obuf = Popen(cmd, "w");
		if (obuf == NULL) {
			warn("%s", cmd);
			obuf = stdout;
		}
	} else if (value("interactive") != NULL &&
	         (page || (cp = value("crt")) != NULL)) {
		nlines = 0;
		if (!page) {
			for (ip = msgvec; *ip && ip-msgvec < msgCount; ip++)
				nlines += message[*ip - 1].m_lines;
		}
		if (page || nlines > (*cp ? atoi(cp) : realscreenheight)) {
			restoreterm = (tcgetattr(fileno(stdin), &tbuf) == 0);
			obuf = Popen(value("PAGER"), "w");
			if (obuf == NULL) {
				warn("%s", cp);
				obuf = stdout;
			}
		}
	}

	/*
	 * send messages to the output.
	 */
	for (ip = msgvec; *ip && ip - msgvec < msgCount; ip++) {
		mp = &message[*ip - 1];
		touch(mp);
		dot = mp;
		if (cmd == NULL && value("quiet") == NULL)
			fprintf(obuf, "Message %d:\n", *ip);
		if (sendmessage(mp, obuf, doign ? ignore : 0, NULL) == -1)
			break;
	}

	if (obuf != stdout) {
		(void)Pclose(obuf);
		if (restoreterm)
			(void)tcsetattr(fileno(stdin), TCSADRAIN, &tbuf);
	}
	return(0);
}

/*
 * Print the top so many lines of each desired message.
 * The number of lines is taken from the variable "toplines"
 * and defaults to 5.
 */
int
top(v)
	void *v;
{
	int *msgvec = v;
	int *ip;
	struct message *mp;
	int c, topl, lines, lineb;
	char *valtop, linebuf[LINESIZE];
	FILE *ibuf;

	topl = 5;
	valtop = value("toplines");
	if (valtop != NULL) {
		topl = atoi(valtop);
		if (topl < 0 || topl > 10000)
			topl = 5;
	}
	lineb = 1;
	for (ip = msgvec; *ip && ip-msgvec < msgCount; ip++) {
		mp = &message[*ip - 1];
		touch(mp);
		dot = mp;
		if (value("quiet") == NULL)
			printf("Message %d:\n", *ip);
		ibuf = setinput(mp);
		c = mp->m_lines;
		if (!lineb)
			putchar('\n');
		for (lines = 0; lines < c && lines <= topl; lines++) {
			if (readline(ibuf, linebuf, sizeof(linebuf), NULL) < 0)
				break;
			puts(linebuf);
			lineb = blankline(linebuf);
		}
	}
	return(0);
}

/*
 * Touch all the given messages so that they will
 * get mboxed.
 */
int
stouch(v)
	void *v;
{
	int *msgvec = v;
	int *ip;

	for (ip = msgvec; *ip != 0; ip++) {
		dot = &message[*ip-1];
		dot->m_flag |= MTOUCH;
		dot->m_flag &= ~MPRESERVE;
	}
	return(0);
}

/*
 * Make sure all passed messages get mboxed.
 */
int
mboxit(v)
	void *v;
{
	int *msgvec = v;
	int *ip;

	for (ip = msgvec; *ip != 0; ip++) {
		dot = &message[*ip-1];
		dot->m_flag |= MTOUCH|MBOX;
		dot->m_flag &= ~MPRESERVE;
	}
	return(0);
}

/*
 * List the folders the user currently has.
 */
int
folders(v)
	void *v;
{
	char *files = (char *)v;
	char dirname[PATHSIZE];
	char cmd[BUFSIZ];

	if (getfold(dirname, sizeof(dirname)) < 0) {
		strcpy(dirname, "$HOME");
	}

	snprintf(cmd, sizeof(cmd), "cd %s; %s %s", dirname, value("LISTER"),
		files && *files ? files : "");

	(void)run_command(value("SHELL"), 0, -1, -1, "-c", cmd, NULL);
	return(0);
}

/*
 * Update the mail file with any new messages that have
 * come in since we started reading mail.
 */
int
inc(v)
	void *v;
{
	int nmsg, mdot;

	nmsg = incfile();

	if (nmsg == 0) {
		puts("No new mail.");
	} else if (nmsg > 0) {
		mdot = newfileinfo(msgCount - nmsg);
		dot = &message[mdot - 1];
	} else {
		puts("\"inc\" command failed...");
	}

	return(0);
}

/*
 * User hit ^C while printing the headers.
 */
void
hdrint(s)
	int s;
{

	gothdrint = 1;
}