/* Copyright (C) 1989, 1992, 1993 Aladdin Enterprises.  All rights reserved.

This file is part of Ghostscript.

Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.  Refer
to the Ghostscript General Public License for full details.

Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License.  A copy of this license is supposed to have been
given to you along with Ghostscript so you can know your rights and
responsibilities.  It should be in a file named COPYING.  Among other
things, the copyright notice and this notice must be preserved on all
copies.  */

/* gdevsco.c - 17Jul91 - wb - based on gdevpcfb.c */
/* 31Jul91 - Rick Calder rick@rick.att.com - ifdefs for AT&T UNIX 4.0 2.1 */
/* 13Sep91 - wb - modify for gs24b2 */
/*  9Mar92 - wb - modify for gs24b4 */
/* generate SCO Xenix/Unix style memory mapped ioctl output */
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gxdevice.h"
#include "gdevpcfb.h"
#include <signal.h>

#ifdef M_XENIX
#include <sys/console.h>		/* SCO Xenix and SCO UNIX */
#else
#include <sys/kd.h>			/* AT&T SVR4 */
#endif

#ifndef CONSIO
#include <sys/machdep.h>		/* Xenix needs this also */
#endif

private int console_fd = -1;	/* file descriptor of console */
fb_ptr fb_addr;			/* address of frame buffer for unix */
private int cur_mode = -1;	/* current video mode */

/* open the console */
/* possible files to open:
 * /dev/console = current system console
 * /dev/vga = vga monitor
 * /dev/tty = current terminal
 */
private void
open_console()
{
	char *dev;
	char *getenv();
	if (console_fd != -1) return;
	dev = getenv("GSDEVICE");
	if (dev == NULL || *dev == '\0')
		dev = "/dev/tty";
	console_fd = open(dev, 0);
	if (console_fd == -1) {
		ega_close((gx_device *)NULL);
		eprintf1("unable to map display '%s'\n", dev);
		perror("open_console");
		exit(1);
	}
}

/* Output to a port */
void
outportb(uint port, byte data)
{
	int i;
	struct port_io_arg pio;

	if (console_fd == -1) open_console();
	pio.args[0].dir = OUT_ON_PORT;
	pio.args[0].port = port;
	pio.args[0].data = data;
	pio.args[1].port = 0;
	pio.args[2].port = 0;
	pio.args[3].port = 0;
	i = ioctl(console_fd, CONSIO, (long)(&pio));
	if (i == -1) {
		ega_close((gx_device *)NULL);
		eprintf("error setting device register\n");
		perror("outportb");
		exit(1);
	}
}

/* Output to 2 consecutive ports */
void
outport2(uint port, byte index, byte data)
{
	int i;
	struct port_io_arg pio;

	if (console_fd == -1) open_console();
	pio.args[0].dir = OUT_ON_PORT;
	pio.args[0].port = port;
	pio.args[0].data = index;
	pio.args[1].dir = OUT_ON_PORT;
	pio.args[1].port = port + 1;
	pio.args[1].data = data;
	pio.args[2].port = 0;
	pio.args[3].port = 0;
	i = ioctl(console_fd, CONSIO, (long)(&pio));
	if (i == -1) {
		ega_close((gx_device *)NULL);
		eprintf("error setting device register\n");
		perror("outport2");
		exit(1);
	}
}

/* interrupt signal handler */
/*  restore the video mode and exit */
private void
ega_int_handler(int sig)
{
	ega_close((gx_device *)NULL);
	eprintf("GS exiting...\n");
	exit(1);
}

/*
 * FIXME to make this work, the SIGCONT handler must restore the
 * the video state, including all the registers.
 * For now, I made the SIGSTOP handler exit just call the SIGINT handler
 */

#ifdef	SIGTSTP
/* user tried to stop us.  restore video and stop */
private void
ega_tstp_handler(int sig)
{
#if 1
	ega_int_handler(sig);
#else
	/* Preferable, but sco does not restore the monitor corretly */
	signal(SIGTSTP, ega_tstp_handler);
	ega_close((gx_device *)NULL);
	eprintf("GS stopping...\n");
	signal(SIGSTOP,SIG_DFL);
	kill(getpid(), SIGSTOP);
#endif
}
#endif	/* SIGTSTP */

#ifdef	SIGCONT
/* we were unstopped.  reopen video */
private void
ega_cont_handler(int sig)
{
#if 1
	ega_int_handler(sig);
#else
	signal(SIGCONT, ega_cont_handler);
	ega_set_mode(cur_mode);
#endif
}
#endif	/* SIGCONT */

/* ------ Internal routines ------ */

/* Catch signals so we can restore the video mode on exit. */
void
ega_set_signals(gx_device *dev)
{	signal(SIGINT, ega_int_handler);
	signal(SIGTERM, ega_int_handler);
#ifdef	SIGTSTP
	signal(SIGTSTP, ega_tstp_handler);
#endif
#ifdef	SIGCONT
	signal(SIGCONT, ega_cont_handler);
#endif
}

/* Read the device mode */
int
ega_get_mode(void)
{	int mode;
	open_console();
	mode = ioctl(console_fd, CONS_CURRENT, 0L);
	if (mode == -1) {
		ega_close((gx_device *)NULL);
		eprintf("unable to get current console mode\n");
		perror("ega_get_mode");
		exit(1);
	}
	if (mode == M_ENH_CG640 || mode == M_CG640x350) return(0x10);
	if (mode == M_VGA12) return(0x12);
	return(0x03);
}

/* Set the device mode */
void
ega_set_mode(int mode)
{	int i, mode1;
	open_console();
	cur_mode = mode;
	mode1 = -1;
	if (mode == 0x10) mode = SW_ENH_CG640;
	else if (mode == 0x12) mode = SW_VGA12;
	else if (mode == 0x03) { mode = SW_VGA80x25; mode1 = SW_ENHC80x25; }
	else {
		eprintf1("can not set to video mode %d\n", mode);
		exit(1);
	}
	i = ioctl(console_fd, mode, 0L);
	if (i == -1 && mode1 != -1)
		i = ioctl(console_fd, mode1, 0L);
	if (i == -1) {
		ega_close((gx_device *)NULL);
		eprintf("unable to set console mode\n");
		perror("ega_set_mode");
		exit(1);
	}
	i = ioctl(console_fd, MAPCONS, 0L);
	if (i == -1) {
		ega_close((gx_device *)NULL);
		eprintf("unable to map console adaptor's display memory\n");
		perror("ega_set_mode");
		exit(1);
	}
	fb_addr = (fb_ptr) (i);
}