File: linux.trm

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/*
 * $Id: linux.trm,v 1.18 1997/04/10 02:34:23 drd Exp $
 *
 */

/* GNUPLOT - linux.trm */
/*
 * Copyright (C) 1993, 1997
 *
 * Permission to use, copy, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted, 
 * provided that the above copyright notice appear in all copies and 
 * that both that copyright notice and this permission notice appear 
 * in supporting documentation.
 *
 * Permission to modify the software is granted, but not the right to
 * distribute the modified code.  Modifications are to be distributed 
 * as patches to released version.
 *
 * This software  is provided "as is" without express or implied warranty.
 *
 * This file is included by ../term.c.
 *
 * This terminal driver supports:
 *  SVGA up to 1024x768x256 for PC's running the Linux Operating System
 *  (also VGA 640x480x16, and SVGA 800x600x256)
 *
 * AUTHOR
 *  Scott Heavner (sdh@po.cwru.edu)
 *  based on original linux.trm by Tommy Frandsen (frandsen@diku.dk)
 *  patched by David J. Liu (liu@molecule.phri.nyu.edu)
 *  to increase perfromance and safety based on the features of SVGALib/GL.
 *  send your comments or suggestions to (pixar!info-gnuplot@sun.com).
 */

/*
 * Compile with Linux SVGAlib 0.95 currently maintained by
 * Harm Hanemaayer (hhanemaa@cs.ruu.nl).
 * supports Trident, Tseng, Cirrus, Oak and generic vga.
 */

#ifndef GOT_DRIVER_H
#include "driver.h"
#endif

#ifdef TERM_REGISTER
register_term(linux)
#endif

#ifdef TERM_PROTO

#define LINUX_VCHAR FNT5X9_VCHAR
#define LINUX_HCHAR FNT5X9_HCHAR
#define LINUX_VTIC 5
#define LINUX_HTIC 5
#define LINUX_XMAX 0 /* These two entries are just place holders. */
#define LINUX_YMAX 0 /* The actual values will be filled in init. */

TERM_PUBLIC void LINUX_options __PROTO((void));
TERM_PUBLIC void LINUX_init __PROTO((void));
TERM_PUBLIC void LINUX_reset __PROTO((void));
TERM_PUBLIC void LINUX_text __PROTO((void));
TERM_PUBLIC void LINUX_graphics __PROTO((void));
TERM_PUBLIC void LINUX_linetype __PROTO((int linetype));
TERM_PUBLIC void LINUX_move __PROTO((unsigned int x,unsigned int y));
TERM_PUBLIC void LINUX_vector __PROTO((unsigned int x,unsigned int y));
TERM_PUBLIC int LINUX_text_angle __PROTO((int ang));
TERM_PUBLIC void LINUX_put_text __PROTO((unsigned int x,unsigned int y,char *str));
TERM_PUBLIC void LINUX_suspend __PROTO((void));
TERM_PUBLIC void LINUX_resume __PROTO((void));

#endif

#ifdef TERM_BODY

#define _STRING_H_
#include <vga.h>

static int linux_vmode = G1024x768x256; /* default mode */
static int vgacolor[] = {7,8,2,3,4,5,9,14,12,15,13,10,11,1,6};
static int graphics_on = FALSE;
vga_modeinfo *modeinfo;
static int linux_startx, linux_starty, linux_lasty;
static int linux_angle;
int LINUX_graphics_allowed;

typedef (*linux_line_func_ptr) __PROTO((int x1, int y1, int x2, int y2));

static void LINUX_putc __PROTO((unsigned int x,unsigned int y,int c,int ang,linux_line_func_ptr line_func));

/* this function is called at the very beginning of main() to initialize
   the vgalib and to revoke suid privileges.
   /dev/console and /dev/tty\d are considered graphic terminals, all other
   don't support the linux terminal */

void LINUX_setup(void)
{
  char line[256];
  FILE *pipe;

  LINUX_graphics_allowed=FALSE;

  if(geteuid()!=0) return; /* if we aren't root, we cannot init graphics */

  if((pipe=popen("/usr/bin/tty","r"))!=NULL) {
    line[0]=0;
    fgets(line,256, pipe);
    pclose(pipe);
    line[strlen(line)-1]='\0';
    if(strcmp(line,"/dev/console")==0 || (strncmp(line, "/dev/tty", 8)==0 &&
       isdigit(line[8])))
      LINUX_graphics_allowed=TRUE;
  }

  if(LINUX_graphics_allowed) {
    vga_init();
  } else {
    /* err - shouldn't we give up root uid whatever happens ?
     * or perhaps vga_init() does it ?
     */
    setuid(getuid());
  }
}

TERM_PUBLIC void LINUX_options()
{
	if(!LINUX_graphics_allowed) {
		int_error("Linux terminal driver not available", NO_CARET);
	}

	fprintf (stderr, "%s\n",vga_getmodename(linux_vmode)) ;
}

TERM_PUBLIC void LINUX_init()
{
/* vga_init () has been moved to immediately after main () for security */
	if (vga_getdefaultmode()!=-1) linux_vmode=vga_getdefaultmode();
	/* get the default mode from GSVGAMODE, if available */
	if (!vga_hasmode(linux_vmode)) linux_vmode = G640x480x16;
	/* test default mode first */
	if (!vga_hasmode(linux_vmode)) {
		fprintf (stderr,"Error, unable to initiate graphics.\n") ;
		return;
	} /* this mode is the bottom line */
	modeinfo = vga_getmodeinfo(linux_vmode);
	term->xmax = modeinfo->width;
	term->ymax = modeinfo->height;
	linux_lasty = modeinfo->height-1;
}

TERM_PUBLIC void LINUX_reset()
{
	if (graphics_on) {
		vga_setmode(TEXT);
		graphics_on = FALSE;
	}
}

TERM_PUBLIC void LINUX_text()
{
	if (graphics_on) {
		vga_getch();
		vga_setmode(TEXT);
		graphics_on = FALSE;
	}
}

TERM_PUBLIC void LINUX_graphics()
{
	if (!graphics_on) {
		vga_setmode(linux_vmode);
		graphics_on = TRUE;
	}
}

TERM_PUBLIC void LINUX_suspend()
{
	vga_flip();
}

TERM_PUBLIC void LINUX_resume()
{
	vga_flip();
}

TERM_PUBLIC void LINUX_linetype(linetype)
int linetype;
{
	if (linetype >= 13)
		linetype %= 13;
	vga_setcolor(vgacolor[linetype+2]);
}

TERM_PUBLIC void LINUX_move(x,y)
unsigned int x;
unsigned int y;
{
	linux_startx = x;
	linux_starty = y;
}

TERM_PUBLIC void LINUX_vector(x,y)
unsigned int x;
unsigned int y;
{
	vga_drawline(linux_startx,linux_lasty-linux_starty,x,linux_lasty-y); 
	linux_startx = x;
	linux_starty = y;
}

TERM_PUBLIC int LINUX_text_angle(ang)
int ang;
{
	linux_angle=ang;
	return TRUE;
}

static void LINUX_putc(x,y,c,ang,line_func)
unsigned int x,y;
int c;
int ang;
linux_line_func_ptr line_func;
{
int i, j, k;
unsigned int pixelon;
	i = (int)(c) - 32;
	for (j=0; j<FNT5X9_VBITS; j++) {
		for (k=0; k<FNT5X9_HBITS; k++) {
			pixelon = (((unsigned int)(fnt5x9[i][j])) >> k & 1);
			if (pixelon) {
				switch(ang) {
					case 0 : (*line_func)(x+k+1,y-j,x+k+1,y-j);
							break;
					case 1 : (*line_func)(x-j,y-k-1,x-j,y-k-1);
							break;
				}
			}
		}
	}
}

TERM_PUBLIC void LINUX_put_text(x,y,str)
unsigned int x, y;
char *str;
{
int i;
	switch(linux_angle) {
		case 0 : y -= LINUX_VCHAR/2;
				break;
		case 1 : x += LINUX_VCHAR/2;
				break;
	}
	for (i=0;str[i];i++) {
		LINUX_putc(x,linux_lasty-y,str[i],linux_angle,vga_drawline); 
		switch(linux_angle) {
			case 0 : x+=LINUX_HCHAR ;
					break;
			case 1 : y+=LINUX_HCHAR ;
					break;
		}
	}
}

#endif

#ifdef TERM_TABLE
TERM_TABLE_START(linux_driver)
    "linux", "Linux PC with (s)vgalib", 
           LINUX_XMAX, LINUX_YMAX, LINUX_VCHAR, LINUX_HCHAR,
           LINUX_VTIC, LINUX_HTIC, LINUX_options, LINUX_init, LINUX_reset,
           LINUX_text, null_scale, LINUX_graphics, LINUX_move, LINUX_vector,
           LINUX_linetype, LINUX_put_text, LINUX_text_angle,
           null_justify_text, do_point, do_arrow, set_font_null,
           0, /* pointsize */
           TERM_CAN_MULTIPLOT, LINUX_suspend, LINUX_resume
TERM_TABLE_END(linux_driver)

#undef LAST_TERM
#define LAST_TERM linux_driver
#endif

#ifdef TERM_HELP
START_HELP(linux)
"1 linux",
"?set terminal linux",
"?set term linux",
"?terminal linux",
"?term linux",
"?linux",
" The `linux` driver has no additional options to specify.  It looks at the",
" environment variable GSVGAMODE for the default mode; if not set, it uses",
" 1024x768x256 as default mode or, if that is not possible, 640x480x16",
" (standard VGA)."
END_HELP(linux)
#endif