File: term.c

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#ifndef lint
static char *RCSid = "$Id: term.c,v 1.104 1998/06/18 14:55:19 ddenholm Exp $";
#endif

/* GNUPLOT - term.c */

/*[
 * Copyright 1986 - 1993, 1998   Thomas Williams, Colin Kelley
 *
 * 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 complete modified source code.  Modifications are to
 * be distributed as patches to the released version.  Permission to
 * distribute binaries produced by compiling modified sources is granted,
 * provided you
 *   1. distribute the corresponding source modifications from the
 *    released version in the form of a patch file along with the binaries,
 *   2. add special version identification to distinguish your version
 *    in addition to the base release version number,
 *   3. provide your name and address as the primary contact for the
 *    support of your modified version, and
 *   4. retain our contact information in regard to use of the base
 *    software.
 * Permission to distribute the released version of the source code along
 * with corresponding source modifications in the form of a patch file is
 * granted with same provisions 2 through 4 for binary distributions.
 *
 * This software is provided "as is" without express or implied warranty
 * to the extent permitted by applicable law.
]*/


 /* This module is responsible for looking after the terminal
  * drivers at the lowest level. Only this module (should)
  * know about all the various rules about interpreting
  * the terminal capabilities exported by the terminal
  * drivers in the table.
  *
  * Note that, as far as this module is concerned, a
  * terminal session lasts only until _either_ terminal
  * or output file changes. Before either is changed,
  * the terminal is shut down.
  * 
  * Entry points : (see also term/README)
  *
  * term_set_output() : called when  set output  invoked
  *
  * term_init()  : optional. Prepare the terminal for first
  *                use. It protects itself against subsequent calls.
  *
  * term_start_plot() : called at start of graph output. Calls term_init
  *                     if necessary
  *
  * term_apply_lp_properties() : apply linewidth settings
  *
  * term_end_plot() : called at the end of a plot
  *
  * term_reset() : called during int_error handling, to shut
  *                terminal down cleanly
  *
  * term_start_multiplot() : called by   set multiplot
  *
  * term_end_multiplot() : called by  set nomultiplot
  *
  * term_check_multiplot_okay() : called just before an interactive
  *                        prompt is issued while in multiplot mode,
  *                        to allow terminal to suspend if necessary,
  *                        Raises an error if interactive multiplot
  *                       is not supported.
  */


#include "driver.h" /* gets plot.h, setshow.h, bitmap.h, stdfn.h */

#ifdef _Windows
FILE * open_printer __PROTO((void));  /* in wprinter.c */
void close_printer __PROTO((FILE *outfile));
#ifdef __MSC__
#include <malloc.h>
#else
#include <alloc.h>
#endif /* MSC */
#endif /* _Windows */

#ifdef VMS
/* for a quiet life */
extern sys$crembx();
extern sys$assign();
extern sys$dassgn();
extern sys$qio();
extern sys$qiow();
extern void lib$signal();
extern unsigned int lib$spawn();
#endif /* VMS */

#if 0 /* defined in driver.h */
/* for use by all drivers */
#define sign(x) ((x) >= 0 ? 1 : -1)
#define ABS(x) ((x) >= 0 ? (x) : -(x))
#endif

static TBOOLEAN term_initialised;			/* true if terminal has been initialized */
static TBOOLEAN term_graphics=FALSE;    /* true if terminal is in graphics mode */
static TBOOLEAN term_suspended=FALSE;   /* we have suspended the driver, in multiplot mode */
static TBOOLEAN opened_binary=FALSE;
static TBOOLEAN term_force_init=FALSE;	/* true if require terminal to be initialized */
extern FILE *outfile;
extern char *outstr;
extern float xsize, ysize;

static double term_pointsize; /* internal pointsize for do_point */

static void term_suspend __PROTO((void));
static void term_close_output __PROTO((void));

void do_point __PROTO((unsigned int x, unsigned int y, int number));
void do_pointsize __PROTO((double size));
void line_and_point __PROTO((unsigned int x, unsigned int y, int number));
void do_arrow __PROTO((unsigned int sx, unsigned int sy, unsigned int ex, unsigned int ey, int head));


int null_text_angle __PROTO((int ang));
int null_justify_text __PROTO((enum JUSTIFY just));
int null_scale __PROTO((double x, double y));
static void null_linewidth __PROTO((double s));
int do_scale __PROTO((double x, double y));
void options_null __PROTO((void));
void UNKNOWN_null __PROTO((void));
void MOVE_null __PROTO((unsigned int, unsigned int));
void LINETYPE_null __PROTO((int));
void PUTTEXT_null __PROTO((unsigned int, unsigned int, char *));


#ifdef __ZTC__
char *ztc_init();
/* #undef TGIF */
#endif

#ifdef VMS
char *vms_init();
void vms_reset();
void term_mode_tek();
void term_mode_native();
void term_pasthru();
void term_nopasthru();
void fflush_binary();
#define FOPEN_BINARY(file) fopen(file, "wb", "rfm=fix", "bls=512", "mrs=512")
#else /* VMS */
#define FOPEN_BINARY(file) fopen(file, "wb")
#endif /* VMS */


/* This is needed because the unixplot library only writes to stdout. */
#ifdef UNIXPLOT
static FILE save_stdout;
#endif
static int unixplot=0;

#if defined(MTOS) || defined(ATARI)
int aesid = -1;
#endif

#define NICE_LINE		0
#define POINT_TYPES		6


/* interface to the rest of gnuplot - the rules are getting
 * too complex for the rest of gnuplot to be allowed in
 */

 
#if defined(PIPES)
static TBOOLEAN pipe_open = FALSE;
#endif /* PIPES */


static void term_close_output()
{
	FPRINTF(("term_close_output\n"));
	
	opened_binary = FALSE;
	
	if (!outstr)  /* ie using stdout */
		return;

#if defined(PIPES)
	if ( pipe_open ) {
		(void) pclose(outfile);
		pipe_open = FALSE;
	} else
#endif /* PIPES */
#ifdef _Windows
		if ( stricmp(outstr,"PRN") == 0 )
			close_printer(outfile);
		else
#endif
			(void) fclose(outfile);

	outfile = stdout; /* Don't dup... */
	free(outstr);
	outstr = NULL;
}


/* assigns dest to outstr, so it must be allocated or NULL
 * and it must not be outstr itself !
 */
void term_set_output(dest)
char *dest;
{
	FILE *f;

	FPRINTF(("term_set_output\n"));
	assert(dest == NULL || dest != outstr);

	 if (multiplot) {
 	    fprintf(stderr,"In multiplotmode you can't change the output\n");
 	    return;
 	 }
 	 
		if (term && term_initialised) {
			(*term->reset)();
			term_initialised=FALSE;
		}
		if (dest == NULL) { /* stdout */
 			UP_redirect (4);
			term_close_output();
		} else {

#if defined(PIPES)
			if ( *dest == '|' ) {
#ifdef OS2
			  if ((f = popen(dest+1,"wb")) == (FILE *)NULL)
#else
			  if ((f = popen(dest+1,"w")) == (FILE *)NULL)
#endif
			    os_error("cannot create pipe; output not changed",c_token);
			  else
			    pipe_open = TRUE;
			} else
#endif /* PIPES */

#ifdef _Windows
			if ( outstr && stricmp(outstr,"PRN") == 0) {
				/* we can't call open_printer() while printer is open, so */
				close_printer(outfile);	/* close printer immediately if open */
			    outfile = stdout;	/* and reset output to stdout */
			    free(outstr);
			    outstr = NULL;
			}
			if ( stricmp(dest,"PRN") == 0 ) {
			  if ((f = open_printer()) == (FILE *)NULL)
			    os_error("cannot open printer temporary file; output may have changed",c_token);
			} else
#endif

		{
			if (term && (term->flags & TERM_BINARY))
			{
				f = FOPEN_BINARY(dest);
			}
			else
				f = fopen(dest, "w");
				
			if (f == (FILE *)NULL)
			    os_error("cannot open file; output not changed",c_token);
		}
		term_close_output();
		outfile = f;
		outstr = dest;
		opened_binary = (term && (term->flags & TERM_BINARY));
 		UP_redirect (1);
	}
}

void term_init()
{
	FPRINTF(("term_init()\n"));
	
	if (!term)
		int_error("No terminal defined", NO_CARET);

	/* check if we have opened the output file in the wrong mode
	 * (text/binary), if set term comes after set output
	 * This was originally done in change_term, but that
	 * resulted in output files being truncated
	 */

	if(outstr &&
	   (((term->flags & TERM_BINARY) && !opened_binary) ||
	   ((!(term->flags & TERM_BINARY) && opened_binary)))) {
			/* this is nasty - we cannot just term_set_output(outstr)
			 * since term_set_output will first free outstr and we
			 * end up with an invalid pointer. I think I would
			 * prefer to defer opening output file until first plot.
			 */
			char *temp = gp_alloc(strlen(outstr)+1, "temp file string");
			if (temp) {
				FPRINTF(("term_init : reopening \"%s\" as %s\n",
				   outstr, term->flags & TERM_BINARY ? "binary" : "text"));
				strcpy(temp, outstr);
				term_set_output(temp); /* will free outstr */
			} else
				fprintf(stderr, "Cannot reopen output file in binary");
				/* and carry on, hoping for the best ! */
	}
#ifdef OS2
	else if (!outstr && !interactive && (term->flags & TERM_BINARY) )
	{
		/* binary (eg gif) to stdout in a non-interactive session */
		fflush(stdout); // _fsetmode requires an empty buffer
		_fsetmode(stdout, "b");
	}
#endif


	if (!term_initialised || term_force_init )
	{
		FPRINTF(("- calling term->init()\n"));
		(*term->init)();
		term_initialised = TRUE;
	}
}


void term_start_plot()
{
	FPRINTF(("term_start_plot()\n"));

	if (!term_initialised)
		term_init();
	
	if (!term_graphics) {
		FPRINTF(("- calling term->graphics()\n"));
		(*term->graphics)();
		term_graphics = TRUE;
	} else if (multiplot && term_suspended) {
		if (term->resume) {
			FPRINTF(("- calling term->resume()\n"));
			(*term->resume)();
		}
		term_suspended = FALSE;
	}
}

void term_end_plot()
{
	FPRINTF(("term_end_plot()\n"));

	if (!term_initialised)
		return;
		
	if (!multiplot) {
		FPRINTF(("- calling term->text()\n"));
		(*term->text)();
		term_graphics = FALSE;
	}

#ifdef VMS
	if (opened_binary)
		fflush_binary();
	else
#endif /* VMS */

	(void) fflush(outfile);
}

void term_start_multiplot()
{
	FPRINTF(("term_start_multiplot()\n"));
	if (multiplot)
		term_end_multiplot();

	multiplot = TRUE;
	term_start_plot();
}

void term_end_multiplot()
{
	FPRINTF(("term_end_multiplot()\n"));
	if (!multiplot)
		return;

	if (term_suspended)
	{
		if (term->resume)
			(*term->resume)();
		term_suspended = FALSE;
	}

	multiplot = FALSE;

	term_end_plot();
}

	

static void term_suspend()
{
	FPRINTF(("term_suspend()\n"));
	if (term_initialised && !term_suspended && term->suspend)
	{
		FPRINTF(("- calling term->suspend()\n"));
		(*term->suspend)();
		term_suspended = TRUE;
	}
}

void term_reset()
{
	FPRINTF(("term_reset()\n"));

	if (!term_initialised)
		return;
		
	if (term_suspended)
	{
		if (term->resume)
		{
			FPRINTF(("- calling term->resume()\n"));
			(*term->resume)();
		}
		term_suspended = FALSE;
	}

	if (term_graphics)
	{
		(*term->text)();
		term_graphics = FALSE;
	}

	if (term_initialised)
	{
		(*term->reset)();
		term_initialised = FALSE;
	}
}

void 
term_apply_lp_properties (lp)
struct lp_style_type *lp;
{
	/*  This function passes all the line and point properties to the
	 *  terminal driver and issues the corresponding commands.
	 *
	 *  Alas, sometimes it might be necessary to give some help to
	 *  this function by explicitly issuing additional '(*term)(...)'
	 *  commands.
	 */
	
	if (lp->pointflag) {
		/* change points, too
		 * Currently, there is no 'pointtype' function.  For points
		 * there is a special function also dealing with (x,y) co-
		 * ordinates.
	 	 */
		(*term->pointsize)(lp->p_size);
	}
	
	/*  _first_ set the line width, _then_ set the line type !
	 *
	 *  The linetype might depend on the linewidth in some terminals.
	 */
	(*term->linewidth)(lp->l_width);
	(*term->linetype)(lp->l_type);
}



void term_check_multiplot_okay(interactive)
TBOOLEAN interactive;
{
	FPRINTF(("term_multiplot_okay(%d)\n", interactive));

	if (!term_initialised)
		return; /* they've not started yet */
	
  	/* make sure that it is safe to issue an interactive prompt
  	 * it is safe if
  	 *   it is not an interactive read, or
  	 *   the terminal supports interactive multiplot, or
  	 *   we are not writing to stdout and terminal doesn't refuse multiplot outright
  	 */
  	if ( !interactive || (term->flags & TERM_CAN_MULTIPLOT) ||
  	          ((outfile!=stdout) && !(term->flags & TERM_CANNOT_MULTIPLOT) )
      )
   {
   	/* it's okay to use multiplot here, but suspend first */
		term_suspend();
		return;
   }

   /* uh oh : they're not allowed to be in multiplot here */
   
	term_end_multiplot();

    /* at this point we know that it is interactive and that the
     * terminal can either only do multiplot when writing to
     * to a file, or it does not do multiplot at all
     */

	if (term->flags & TERM_CANNOT_MULTIPLOT)
		int_error("This terminal does not support multiplot", NO_CARET);
	else
		int_error("Must set output to a file or put all multiplot commands on one input line", NO_CARET);
}

void do_point(x,y,number)
unsigned int x,y;
int number;
{
register int htic,vtic;
register struct termentry *t = term;

     if (number < 0) {		/* do dot */
	    (*t->move)(x,y);
	    (*t->vector)(x,y);
	    return;
	}

	number %= POINT_TYPES;
	htic = (term_pointsize*t->h_tic/2);	/* should be in term_tbl[] in later version */
	vtic = (term_pointsize*t->v_tic/2);	

	switch(number) {
		case 0: /* do diamond */ 
				(*t->move)(x-htic,y);
				(*t->vector)(x,y-vtic);
				(*t->vector)(x+htic,y);
				(*t->vector)(x,y+vtic);
				(*t->vector)(x-htic,y);
				(*t->move)(x,y);
				(*t->vector)(x,y);
				break;
		case 1: /* do plus */ 
				(*t->move)(x-htic,y);
				(*t->vector)(x-htic,y);
				(*t->vector)(x+htic,y);
				(*t->move)(x,y-vtic);
				(*t->vector)(x,y-vtic);
				(*t->vector)(x,y+vtic);
				break;
		case 2: /* do box */ 
				(*t->move)(x-htic,y-vtic);
				(*t->vector)(x-htic,y-vtic);
				(*t->vector)(x+htic,y-vtic);
				(*t->vector)(x+htic,y+vtic);
				(*t->vector)(x-htic,y+vtic);
				(*t->vector)(x-htic,y-vtic);
				(*t->move)(x,y);
				(*t->vector)(x,y);
				break;
		case 3: /* do X */ 
				(*t->move)(x-htic,y-vtic);
				(*t->vector)(x-htic,y-vtic);
				(*t->vector)(x+htic,y+vtic);
				(*t->move)(x-htic,y+vtic);
				(*t->vector)(x-htic,y+vtic);
				(*t->vector)(x+htic,y-vtic);
				break;
		case 4: /* do triangle */ 
				(*t->move)(x,y+(4*vtic/3));
				(*t->vector)(x-(4*htic/3),y-(2*vtic/3));
				(*t->vector)(x+(4*htic/3),y-(2*vtic/3));
				(*t->vector)(x,y+(4*vtic/3));
				(*t->move)(x,y);
				(*t->vector)(x,y);
				break;
		case 5: /* do star */ 
				(*t->move)(x-htic,y);
				(*t->vector)(x-htic,y);
				(*t->vector)(x+htic,y);
				(*t->move)(x,y-vtic);
				(*t->vector)(x,y-vtic);
				(*t->vector)(x,y+vtic);
				(*t->move)(x-htic,y-vtic);
				(*t->vector)(x-htic,y-vtic);
				(*t->vector)(x+htic,y+vtic);
				(*t->move)(x-htic,y+vtic);
				(*t->vector)(x-htic,y+vtic);
				(*t->vector)(x+htic,y-vtic);
				break;
	}
}

void do_pointsize(size)
double size;
{
	term_pointsize = (size >= 0 ? size : 1);
}


/*
 * general point routine
 */
void line_and_point(x,y,number)
unsigned int x,y;
int number;
{
	/* temporary(?) kludge to allow terminals with bad linetypes 
		to make nice marks */

	(*term->linetype)(NICE_LINE);
	do_point(x,y,number);
}

/* 
 * general arrow routine
 *
 * I set the angle between the arrowhead and the line 15 degree.
 * The length of arrowhead varies depending on the line length 
 * within the the range [0.3*(the-tic-length), 2*(the-tic-length)].
 * No head is printed if the arrow length is zero.
 *
 *            Yasu-hiro Yamazaki(hiro@rainbow.physics.utoronto.ca)
 *            Jul 1, 1993
 */

#define COS15 (0.96593)         /* cos of 15 degree */
#define SIN15 (0.25882)         /* sin of 15 degree */

#define HEAD_LONG_LIMIT  (2.0)  /* long  limit of arrowhead length */
#define HEAD_SHORT_LIMIT (0.3)  /* short limit of arrowhead length */
                                /* their units are the "tic" length */ 

#define HEAD_COEFF  (0.3)       /* default value of head/line length ratio */

void do_arrow(sx, sy, ex, ey, head)
	unsigned int sx,sy;			/* start point */
	unsigned int ex, ey;			/* end point (point of arrowhead) */
	TBOOLEAN head;
{
    register struct termentry *t = term;
    float len_tic = ((double) (t->h_tic + t->v_tic) )/2.0;
                                       /* average of tic sizes */
    double dx = (double)sx - (double)ex;
    double dy = (double)sy - (double)ey;     /* (dx,dy) : vector from end to start */
    double len_arrow = sqrt( dx*dx + dy*dy );

    /* draw the line for the arrow. That's easy. */
    (*t->move)(sx, sy);
    (*t->vector)(ex, ey);

    if (head && len_arrow != 0.0) { /* no head for arrows whih length=0 */
      /* now calc the head_coeff */
      double  coeff_shortest = len_tic*HEAD_SHORT_LIMIT/len_arrow;
      double  coeff_longest  = len_tic*HEAD_LONG_LIMIT/len_arrow;
      double  head_coeff = GPMAX( coeff_shortest, 
                                GPMIN( HEAD_COEFF, coeff_longest) );
    /* now draw the arrow head. */
    /* we put the arrowhead marks at 15 degrees to line */
      int x,y;			/* one endpoint */

      x = (int)( ex + ( COS15*dx - SIN15*dy) * head_coeff );
      y = (int)( ey + ( SIN15*dx + COS15*dy) * head_coeff );
      (*t->move)(x,y);
      (*t->vector)(ex,ey);

      x = (int)( ex + ( COS15*dx + SIN15*dy) * head_coeff );
      y = (int)( ey + (-SIN15*dx + COS15*dy) * head_coeff );
     (*t->vector)(x,y);
    }
}

#if 0 /* oiginal routine */
#define ROOT2 (1.41421)		/* sqrt of 2 */

void org_do_arrow(sx, sy, ex, ey, head)
	int sx,sy;			/* start point */
	int ex, ey;			/* end point (point of arrowhead) */
	TBOOLEAN head;
{
    register struct termentry *t = term;
    int len = (t->h_tic + t->v_tic)/2; /* arrowhead size = avg of tic sizes */

    /* draw the line for the arrow. That's easy. */
    (*t->move)(sx, sy);
    (*t->vector)(ex, ey);

    if (head) {
    /* now draw the arrow head. */
    /* we put the arrowhead marks at 45 degrees to line */
       if (sx == ex) {
	   /* vertical line, special case */
	      int delta = ((float)len / ROOT2 + 0.5);
	      if (sy < ey)
		      delta = -delta;	/* up arrow goes the other way */
	      (*t->move)(ex - delta, ey + delta);
	      (*t->vector)(ex,ey);
	      (*t->vector)(ex + delta, ey + delta);
       } else {
	      int dx = sx - ex;
	      int dy = sy - ey;
	      double coeff = len / sqrt(2.0*((double)dx*(double)dx 
				   + (double)dy*(double)dy));
	      int x,y;			/* one endpoint */

	      x = (int)( ex + (dx + dy) * coeff );
	      y = (int)( ey + (dy - dx) * coeff );
	      (*t->move)(x,y);
	      (*t->vector)(ex,ey);

	      x = (int)( ex + (dx - dy) * coeff );
	      y = (int)( ey + (dy + dx) * coeff );
	      (*t->vector)(x,y);
       }
    }
}
#endif /* original routine */


#define TERM_PROTO
#define TERM_BODY
#define TERM_PUBLIC static

#include "term.h"

#undef TERM_PROTO
#undef TERM_BODY
#undef TERM_PUBLIC


/* Dummy functions for unavailable features */
/* return success if they asked for default - this simplifies code
 * where param is passed as a param. Client can first pass it here,
 * and only if it fails do they have to see what was trying to be done
 */

/* change angle of text.  0 is horizontal left to right.
* 1 is vertical bottom to top (90 deg rotate)  
*/
int null_text_angle(ang)
int ang;
{
return (ang==0);
}

/* change justification of text.  
 * modes are LEFT (flush left), CENTRE (centred), RIGHT (flush right)
 */
int null_justify_text(just)
enum JUSTIFY just;
{
return (just==LEFT);
}


/* Change scale of plot.
 * Parameters are x,y scaling factors for this plot.
 * Some terminals (eg latex) need to do scaling themselves.
 */
int null_scale(x,y)
double x;
double y;
{
return FALSE ;	/* can't be done */
}

int do_scale(x,y)
double x;
double y;
{
return TRUE ;	/* can be done */
}

void options_null()
{
	term_options[0] = '\0';	/* we have no options */
}

void UNKNOWN_null()
{
}

void MOVE_null(x,y)
unsigned int x,y;
{
}

void LINETYPE_null(t)
int t;
{
}

void PUTTEXT_null(x,y,s)
unsigned int x,y;
char *s;
{
}


int set_font_null(s)
char *s;
{
  return FALSE;
}

static void null_linewidth(s)
double s;
{
}


/* cast to get rid of useless warnings about UNKNOWN_null */
typedef void (*void_fp) __PROTO((void));


/* setup the magic macros to compile in the right parts of the
 * terminal drivers included by term.h
 */
 
#define TERM_TABLE
#define TERM_TABLE_START(x) ,{
#define TERM_TABLE_END(x)   }


/*
 * term_tbl[] contains an entry for each terminal.  "unknown" must be the
 *   first, since term is initialized to 0.
 */
struct termentry term_tbl[] = {
    {"unknown", "Unknown terminal type - not a plotting device",
	  100, 100, 1, 1,
	  1, 1, options_null, UNKNOWN_null, UNKNOWN_null, 
	  UNKNOWN_null, null_scale, UNKNOWN_null, MOVE_null, MOVE_null, 
	  LINETYPE_null, PUTTEXT_null}

    ,{"table", "Dump ASCII table of X Y [Z] values to output",
	  100, 100, 1, 1,
	  1, 1, options_null, UNKNOWN_null, UNKNOWN_null, 
	  UNKNOWN_null, null_scale, UNKNOWN_null, MOVE_null, MOVE_null,
	  LINETYPE_null, PUTTEXT_null}

#include "term.h"

};

#define TERMCOUNT (sizeof(term_tbl)/sizeof(struct termentry))


void list_terms()
{
register int i;

	fprintf(stderr,"\nAvailable terminal types:\n");
	for (i = 0; i < TERMCOUNT; i++)
		fprintf(stderr,"  %15s  %s\n",
			   term_tbl[i].name, term_tbl[i].description);
	(void) putc('\n',stderr);
}


/* set_term: get terminal number from name on command line */
/* will change 'term' variable if successful */
struct termentry *
set_term(c_token)
int c_token;
{
    register struct termentry *t=NULL;
    char *input_name;

    if (!token[c_token].is_token)
	 int_error("terminal name expected",c_token);
    input_name = input_line + token[c_token].start_index;
    t = change_term(input_name, token[c_token].length);
    if (!t)
	 int_error("unknown or ambiguous terminal type; type just 'set terminal' for a list",
			 c_token);

    /* otherwise the type was changed */

    return(t);
}

/* change_term: get terminal number from name and set terminal type */
/* returns NULL for unknown or ambiguous, otherwise is terminal driver pointer */
struct termentry *
change_term(name, length)
	char *name;
	int length;
{
    int i;
    struct termentry *t=NULL;

    for (i = 0; i < TERMCOUNT; i++) {
	   if (!strncmp(name,term_tbl[i].name,length)) {
		  if (t)
		    return(NULL);	/* ambiguous */
		  t = term_tbl+i;
	   }
    }

    if (!t)			/* unknown */
	 return(NULL);

    /* Success: set terminal type now */

    term = t;
    term_initialised = FALSE;
    name = term->name;

    if (term->scale != null_scale)
    	fprintf(stderr, "Warning : scale interface is not null_scale - may not work with multiplot\n");

    /* check that optional fields are initialised to something */
    if (term->text_angle==0)
    	term->text_angle = null_text_angle;
    if (term->justify_text==0)
    	term->justify_text=null_justify_text;
    if (term->point==0)
    	term->point = do_point;
    if (term->arrow==0)
    	term->arrow = do_arrow;
    if (term->set_font==0)
    	term->set_font = set_font_null;
    if (term->pointsize==0)
    	term->pointsize = do_pointsize;
    if (term->linewidth==0)
    	term->linewidth = null_linewidth;

    /* Special handling for unixplot term type */
    if (!strncmp("unixplot",name,8)) {
	   UP_redirect (2);  /* Redirect actual stdout for unixplots */
    } else if (unixplot) {
	   UP_redirect (3);  /* Put stdout back together again. */
    }

    if (interactive)
	 fprintf(stderr, "Terminal type set to '%s'\n", name);

    return(t);
}

/*
   Routine to detect what terminal is being used (or do anything else
   that would be nice).  One anticipated (or allowed for) side effect
   is that the global ``term'' may be set. 
   The environment variable GNUTERM is checked first; if that does
   not exist, then the terminal hardware is checked, if possible, 
   and finally, we can check $TERM for some kinds of terminals.
   A default can be set with -DDEFAULTTERM=myterm in the Makefile
   or #define DEFAULTTERM myterm in term.h
*/
/* thanks to osupyr!alden (Dave Alden) for the original GNUTERM code */
void init_terminal()
{
#ifdef DEFAULTTERM
	char *term_name = DEFAULTTERM;
#else
    char *term_name = NULL;
#endif /* DEFAULTTERM */
#if (defined(__TURBOC__) && defined(MSDOS) && !defined(_Windows)) || defined(NEXT) || defined(SUN) || defined(X11)
    char *term = NULL;		/* from TERM environment var */
#endif
#ifdef X11
    char *display = NULL;
#endif
    char *gnuterm = NULL;

    /* GNUTERM environment variable is primary */
    gnuterm = getenv("GNUTERM");
    if (gnuterm != (char *)NULL) {
	 term_name = gnuterm;
    }
    else {
	   
#ifdef __ZTC__
	  term_name = ztc_init();
#endif

#ifdef VMS
	   term_name = vms_init();
#endif /* VMS */

#ifdef NEXT
	term = getenv("TERM");
	if (term_name == (char *)NULL
		&& term != (char *)NULL && strcmp(term,"next") == 0)
	      term_name = "next";
#endif /* NeXT */
	   
#ifdef SUN
	   term = getenv("TERM");	/* try $TERM */
	   if (term_name == (char *)NULL
		  && term != (char *)NULL && strcmp(term, "sun") == 0)
		term_name = "sun";
#endif /* sun */

#ifdef _Windows
		term_name = "win";
#endif /* _Windows */

#ifdef GPR
   if (gpr_isa_pad()) term_name = "gpr";       /* find out whether stdout is a DM pad. See term/gpr.trm */
#else
#ifdef APOLLO
   if (apollo_isa_pad()) term_name = "apollo"; /* find out whether stdout is a DM pad. See term/apollo.trm */
#endif /* APOLLO */
#endif /* GPR    */

#ifdef X11
	   term = getenv("TERM");	/* try $TERM */
	   if (term_name == (char *)NULL
		  && term != (char *)NULL && strcmp(term, "xterm") == 0)
		term_name = "x11";
	   display = getenv("DISPLAY");
	   if (term_name == (char *)NULL && display != (char *)NULL)
		term_name = "x11";
	   if (X11_Display)
		term_name = "x11";
#endif /* x11 */

#ifdef AMIGA
	   term_name = "amiga";
#endif

#if defined(ATARI) || defined(MTOS)
	   term_name = "atari";
#endif

#ifdef UNIXPC
           if (iswind() == 0) {
              term_name = "unixpc";
           }
#endif /* unixpc */

#ifdef CGI
	   if (getenv("CGIDISP") || getenv("CGIPRNT"))
	     term_name = "cgi";
#endif /*CGI */

#ifdef DJGPP
		term_name = "svga";
#endif

#ifdef GRASS
        term_name = "grass";
#endif

#ifdef OS2
           if (_osmode==OS2_MODE) term_name = "pm" ; else term_name = "emxvga";
#endif /*OS2 */           

/* set linux terminal only if LINUX_setup was successfull, if we are on X11
   LINUX_setup has failed, also if we are logged in by network */
#ifdef LINUXVGA
	   if(LINUX_graphics_allowed)
	     term_name = "linux";
#endif /* LINUXVGA */
    }

    /* We have a name, try to set term type */
    if (term_name != NULL && *term_name != '\0') {
	   if (change_term(term_name, (int)strlen(term_name)))
	   	return;
		fprintf(stderr, "Unknown or ambiguous terminal name '%s'\n", term_name);
    }
    change_term("unknown", 7);
}


#if defined(__ZTC__)
char *
ztc_init()
{
  int g_mode;
  char *term_name = NULL;

	g_mode = fg_init();

		  switch (g_mode){
			case FG_NULL	  :  fprintf(stderr,"Graphics card not detected or not supported.\n");
								 exit(1);
			case FG_HERCFULL  :  term_name = "hercules";
								 break;
			case FG_EGAMONO   :  term_name = "egamono";
								 break;
			case FG_EGAECD	  :  term_name = "egalib";
								 break;
			case FG_VGA11	  :  term_name = "vgamono";
								 break;
			case FG_VGA12	  :  term_name = "vgalib";
								 break;
			case FG_VESA6A	  :  term_name = "svgalib";
								 break;
			case FG_VESA5	  :  term_name = "ssvgalib";
								 break;
			}
		fg_term();
  return(term_name);
}
#endif /* __ZTC__ */


/*
	This is always defined so we don't have to have command.c know if it
	is there or not.
*/
#ifndef UNIXPLOT
void UP_redirect(caller) int caller; 
{
	caller = caller;	/* to stop Turbo C complaining 
						 * about caller not being used */
}
#else
void UP_redirect (caller)
int caller;
/*
	Unixplot can't really write to outfile--it wants to write to stdout.
	This is normally ok, but the original design of gnuplot gives us
	little choice.  Originally users of unixplot had to anticipate
	their needs and redirect all I/O to a file...  Not very gnuplot-like.

	caller:  1 - called from SET OUTPUT "FOO.OUT"
			 2 - called from SET TERM UNIXPLOT
			 3 - called from SET TERM other
			 4 - called from SET OUTPUT
*/
{
	switch (caller) {
	case 1:
	/* Don't save, just replace stdout w/outfile (save was already done). */
		if (unixplot)
			*(stdout) = *(outfile);  /* Copy FILE structure */
	break;
	case 2:
		if (!unixplot) {
			fflush(stdout);
			save_stdout = *(stdout);
			*(stdout) = *(outfile);  /* Copy FILE structure */
			unixplot = 1;
		}
	break;
	case 3:
	/* New terminal in use--put stdout back to original. */
		/* closepl(); */  /* This is called by the term. */
		fflush(stdout);
		*(stdout) = save_stdout;  /* Copy FILE structure */
		unixplot = 0;
	break;
	case 4:
	/*  User really wants to go to normal output... */
		if (unixplot) {
			fflush(stdout);
			*(stdout) = save_stdout;  /* Copy FILE structure */
		}
	break;
	}
}
#endif


/* test terminal by drawing border and text */
/* called from command test */
void test_term()
{
	register struct termentry *t = term;
	char *str;
	int x,y, xl,yl, i;
	unsigned int xmax, ymax;
	char label[MAX_ID_LEN];
	int key_entry_height;
	int p_width;

	term_start_plot();
	screen_ok = FALSE;
	xmax = (unsigned int)(t->xmax * xsize);
	ymax = (unsigned int)(t->ymax * ysize);

	p_width = pointsize * (t->h_tic);
	key_entry_height = pointsize * (t->v_tic) * 1.25;
	if (key_entry_height < (t->v_char) )
		key_entry_height = (t->v_char);

	/* border linetype */
	(*t->linetype)(-2);
	(*t->move)(0,0);
	(*t->vector)(xmax-1,0);
	(*t->vector)(xmax-1,ymax-1);
	(*t->vector)(0,ymax-1);
	(*t->vector)(0,0);
	(void) (*t->justify_text)(LEFT);
	(*t->put_text)(t->h_char*5,ymax-t->v_char*3,"Terminal Test");
	/* axis linetype */
	(*t->linetype)(-1);
	(*t->move)(xmax/2,0);
	(*t->vector)(xmax/2,ymax-1);
	(*t->move)(0,ymax/2);
	(*t->vector)(xmax-1,ymax/2);
	/* test width and height of characters */
	(*t->linetype)(-2);
	(*t->move)(  xmax/2-t->h_char*10,ymax/2+t->v_char/2);
	(*t->vector)(xmax/2+t->h_char*10,ymax/2+t->v_char/2);
	(*t->vector)(xmax/2+t->h_char*10,ymax/2-t->v_char/2);
	(*t->vector)(xmax/2-t->h_char*10,ymax/2-t->v_char/2);
	(*t->vector)(xmax/2-t->h_char*10,ymax/2+t->v_char/2);
	(*t->put_text)(xmax/2-t->h_char*10,ymax/2,
		"12345678901234567890");
	/* test justification */
	(void) (*t->justify_text)(LEFT);
	(*t->put_text)(xmax/2,ymax/2+t->v_char*6,"left justified");
	str = "centre+d text";
	if ((*t->justify_text)(CENTRE))
		(*t->put_text)(xmax/2,
				ymax/2+t->v_char*5,str);
	else
		(*t->put_text)(xmax/2-strlen(str)*t->h_char/2,
				ymax/2+t->v_char*5,str);
	str = "right justified";
	if ((*t->justify_text)(RIGHT))
		(*t->put_text)(xmax/2,
				ymax/2+t->v_char*4,str);
	else
		(*t->put_text)(xmax/2-strlen(str)*t->h_char,
				ymax/2+t->v_char*4,str);
	/* test text angle */
	str = "rotated ce+ntred text";
	if ((*t->text_angle)(1)) {
		if ((*t->justify_text)(CENTRE))
			(*t->put_text)(t->v_char,
				ymax/2,str);
		else
			(*t->put_text)(t->v_char,
				ymax/2-strlen(str)*t->h_char/2,str);
	}
	else {
	    (void) (*t->justify_text)(LEFT);
	    (*t->put_text)(t->h_char*2,ymax/2-t->v_char*2,"Can't rotate text");
	}
	(void) (*t->justify_text)(LEFT);
	(void) (*t->text_angle)(0);
	/* test tic size */
	(*t->move)( (unsigned int) (xmax/2+t->h_tic*(1+ticscale)) , (unsigned) 0);
	(*t->vector)( (unsigned int)(xmax/2+t->h_tic*(1+ticscale)),(unsigned int)(ticscale*t->v_tic));
	(*t->move)((unsigned int)(xmax/2),(unsigned int)(t->v_tic*(1+ticscale)));
	(*t->vector)((unsigned int)(xmax/2+ticscale*t->h_tic),(unsigned int)(t->v_tic*(1+ticscale)));
	(*t->put_text)((unsigned int)(xmax/2-10*t->h_char), (unsigned int)(t->v_tic*2+t->v_char/2),"test tics");

	/* test line and point types */
	x = xmax - t->h_char*6 - p_width;
	y = ymax - key_entry_height;
    (*t->pointsize)(pointsize);
	for ( i = -2; y > key_entry_height; i++ ) {
		(*t->linetype)(i);
		/*	(void) sprintf(label,"%d",i);  Jorgen Lippert
		lippert@risoe.dk */
		(void) sprintf(label,"%d",i+1);
		if ((*t->justify_text)(RIGHT))
			(*t->put_text)(x,y,label);
		else
			(*t->put_text)(x-strlen(label)*t->h_char,y,label);
		(*t->move)(x+t->h_char,y);
		(*t->vector)(x+t->h_char*4,y);
		if ( i >= -1 )
			(*t->point)(x+t->h_char*5+p_width/2,y,i);
		y -= key_entry_height;
	}
	/* test some arrows */
	(*t->linewidth)(1.0);
	(*t->linetype)(0);
	x = xmax/4;
	y = ymax/4;
	xl = t->h_tic*5;
	yl = t->v_tic*5;
	(*t->arrow)(x,y,x+xl,y,TRUE);
	(*t->arrow)(x,y,x+xl/2,y+yl,TRUE);
	(*t->arrow)(x,y,x,y+yl,TRUE);
	(*t->arrow)(x,y,x-xl/2,y+yl,FALSE);
	(*t->arrow)(x,y,x-xl,y,TRUE);
	(*t->arrow)(x,y,x-xl,y-yl,TRUE);
	(*t->arrow)(x,y,x,y-yl,TRUE);
	(*t->arrow)(x,y,x+xl,y-yl,TRUE);

	term_end_plot();
}

#if 0
#if defined(MSDOS)||defined(g)||defined(MTOS)||defined(OS2)||defined(_Windows)||defined(DOS386)
/* output for some terminal types must be binary to stop non Unix computers
   changing \n to \r\n. 
   If the output is not STDOUT, the following code reopens outfile 
   with binary mode. */
void
reopen_binary()
{
	if (outstr) {
		(void) fclose(outfile);
#ifdef _Windows
		if ( !stricmp(outstr,"PRN") )
			(void) strcpy(filename,win_prntmp);	/* use temp file for windows */
#endif
		if ( (outfile = fopen(filename,"wb")) == (FILE *)NULL ) {
			if ( (outfile = fopen(filename,"w")) == (FILE *)NULL ) {
				os_error("cannot reopen file with binary type; output unknown",
					NO_CARET);
			} 
			else {
	os_error("cannot reopen file with binary type; output reset to ascii", 
					NO_CARET);
			}
		}
#if defined(__TURBOC__) && defined(MSDOS)
#ifndef _Windows
		if ( !stricmp(outstr,"PRN") )
		{
		/* Put the printer into binary mode. */
		union REGS regs;
			regs.h.ah = 0x44;	/* ioctl */
			regs.h.al = 0;		/* get device info */
			regs.x.bx = fileno(outfile);
			intdos(&regs, &regs);
			regs.h.dl |= 0x20;	/* binary (no ^Z intervention) */
			regs.h.dh = 0;
			regs.h.ah = 0x44;	/* ioctl */
			regs.h.al = 1;		/* set device info */
			intdos(&regs, &regs);
		}
#endif
#endif
	}
}
#endif
#endif /* 0 */

#ifdef VMS
/* these are needed to modify terminal characteristics */
#include <descrip.h>
#include <iodef.h>
#include <ttdef.h>
#include <tt2def.h>
#include <dcdef.h>
#include <ssdef.h>
#include <stat.h>
#include <fab.h>
#ifndef TT2$M_DECCRT3         /* VT300 not defined as of VAXC v2.4 */
#define TT2$M_DECCRT3 0X80000000
#endif 
static unsigned short   chan;
static int  old_char_buf[3], cur_char_buf[3];
$DESCRIPTOR(sysoutput_desc,"SYS$OUTPUT");

char *vms_init()
/*
 *  Look first for decw$display (decterms do regis)
 *  Determine if we have a regis terminal
 * and save terminal characteristics
*/
{
   /* Save terminal characteristics in old_char_buf and
   initialise cur_char_buf to current settings. */
   int i;
   if (getenv("DECW$DISPLAY"))
   	return("x11");
   atexit(vms_reset);
   sys$assign(&sysoutput_desc,&chan,0,0);
   sys$qiow(0,chan,IO$_SENSEMODE,0,0,0,old_char_buf,12,0,0,0,0);
   for (i = 0 ; i < 3 ; ++i) cur_char_buf[i] = old_char_buf[i];
   sys$dassgn(chan);

   /* Test if terminal is regis */
   if ((cur_char_buf[2] & TT2$M_REGIS) == TT2$M_REGIS) return("regis");
   return(NULL);
}

void
vms_reset()
/* set terminal to original state */
{
   int i;
   sys$assign(&sysoutput_desc,&chan,0,0);
   sys$qiow(0,chan,IO$_SETMODE,0,0,0,old_char_buf,12,0,0,0,0);
   for (i = 0 ; i < 3 ; ++i) cur_char_buf[i] = old_char_buf[i];
   sys$dassgn(chan);
}

void
term_mode_tek()
/* set terminal mode to tektronix */
{
   long status;
   if (outfile != stdout) return; /* don't modify if not stdout */
   sys$assign(&sysoutput_desc,&chan,0,0);
   cur_char_buf[0] = 0x004A0000 | DC$_TERM | (TT$_TEK401X<<8);
   cur_char_buf[1] = (cur_char_buf[1] & 0x00FFFFFF) | 0x18000000;

   cur_char_buf[1] &= ~TT$M_CRFILL;
   cur_char_buf[1] &= ~TT$M_ESCAPE;
   cur_char_buf[1] &= ~TT$M_HALFDUP;
   cur_char_buf[1] &= ~TT$M_LFFILL;
   cur_char_buf[1] &= ~TT$M_MECHFORM;
   cur_char_buf[1] &= ~TT$M_NOBRDCST;
   cur_char_buf[1] &= ~TT$M_NOECHO;
   cur_char_buf[1] &= ~TT$M_READSYNC;
   cur_char_buf[1] &= ~TT$M_REMOTE;
   cur_char_buf[1] |= TT$M_LOWER;
   cur_char_buf[1] |= TT$M_TTSYNC;
   cur_char_buf[1] |= TT$M_WRAP;
   cur_char_buf[1] &= ~TT$M_EIGHTBIT;
   cur_char_buf[1] &= ~TT$M_MECHTAB;
   cur_char_buf[1] &= ~TT$M_SCOPE;
   cur_char_buf[1] |= TT$M_HOSTSYNC;

   cur_char_buf[2] &= ~TT2$M_APP_KEYPAD;
   cur_char_buf[2] &= ~TT2$M_BLOCK;
   cur_char_buf[2] &= ~TT2$M_DECCRT3;
   cur_char_buf[2] &= ~TT2$M_LOCALECHO;
   cur_char_buf[2] &= ~TT2$M_PASTHRU;
   cur_char_buf[2] &= ~TT2$M_REGIS;
   cur_char_buf[2] &= ~TT2$M_SIXEL;
   cur_char_buf[2] |= TT2$M_BRDCSTMBX;
   cur_char_buf[2] |= TT2$M_EDITING;
   cur_char_buf[2] |= TT2$M_INSERT;
   cur_char_buf[2] |= TT2$M_PRINTER;
   cur_char_buf[2] &= ~TT2$M_ANSICRT;
   cur_char_buf[2] &= ~TT2$M_AVO;
   cur_char_buf[2] &= ~TT2$M_DECCRT;
   cur_char_buf[2] &= ~TT2$M_DECCRT2;
   cur_char_buf[2] &= ~TT2$M_DRCS;
   cur_char_buf[2] &= ~TT2$M_EDIT;
   cur_char_buf[2] |= TT2$M_FALLBACK;

   status = sys$qiow(0,chan,IO$_SETMODE,0,0,0,cur_char_buf,12,0,0,0,0);
   if (status == SS$_BADPARAM) {
      /* terminal fallback utility not installed on system */
      cur_char_buf[2] &= ~TT2$M_FALLBACK;
      sys$qiow(0,chan,IO$_SETMODE,0,0,0,cur_char_buf,12,0,0,0,0);
   }
   else {
      if (status != SS$_NORMAL)
         lib$signal(status,0,0);
   }
   sys$dassgn(chan);
}

void
term_mode_native()
/* set terminal mode back to native */
{
   int i;
   if (outfile != stdout) return; /* don't modify if not stdout */
   sys$assign(&sysoutput_desc,&chan,0,0);
   sys$qiow(0,chan,IO$_SETMODE,0,0,0,old_char_buf,12,0,0,0,0);
   for (i = 0 ; i < 3 ; ++i) cur_char_buf[i] = old_char_buf[i];
   sys$dassgn(chan);
}

void
term_pasthru()
/* set terminal mode pasthru */
{
   if (outfile != stdout) return; /* don't modify if not stdout */
   sys$assign(&sysoutput_desc,&chan,0,0);
   cur_char_buf[2] |= TT2$M_PASTHRU;
   sys$qiow(0,chan,IO$_SETMODE,0,0,0,cur_char_buf,12,0,0,0,0);
   sys$dassgn(chan);
}

void
term_nopasthru()
/* set terminal mode nopasthru */
{
   if (outfile != stdout) return; /* don't modify if not stdout */
   sys$assign(&sysoutput_desc,&chan,0,0);
   cur_char_buf[2] &= ~TT2$M_PASTHRU;
   sys$qiow(0,chan,IO$_SETMODE,0,0,0,cur_char_buf,12,0,0,0,0);
   sys$dassgn(chan);
}

void
fflush_binary()
{
   typedef short int INT16;     /* signed 16-bit integers */
   register INT16 k;            /* loop index */
   if (outfile != stdout) {
       /* Stupid VMS fflush() raises error and loses last data block
          unless it is full for a fixed-length record binary file.
          Pad it here with NULL characters. */
       for (k = (INT16)((*outfile)->_cnt); k > 0; --k)
          putc('\0',outfile);
       fflush(outfile);
   }
}
#endif /* VMS */