#ifndef lint
static char *RCSid() { return RCSid("$Id: show.c,v 1.185.2.2 2007/08/26 06:15:51 sfeam Exp $"); }
#endif

/* GNUPLOT - show.c */

/*[
 * Copyright 1986 - 1993, 1998, 2004   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.
]*/


/*
 * 19 September 1992  Lawrence Crowl  (crowl@cs.orst.edu)
 * Added user-specified bases for log scaling.
 */

#include "setshow.h"

#include "alloc.h"
#include "axis.h"
#include "command.h"
#include "contour.h"
#include "datafile.h"
#include "eval.h"
#include "fit.h"
#include "gp_time.h"
#include "graphics.h"
#include "hidden3d.h"
#include "misc.h"
#include "gp_hist.h"
#include "plot2d.h"
#include "plot3d.h"
#include "save.h"
#include "tables.h"
#include "util.h"
#include "term_api.h"
#include "variable.h"
#include "version.h"
#ifdef USE_MOUSE
# include "mouse.h"
#endif
#include "color.h"
#include "pm3d.h"
#include "getcolor.h"
#include <ctype.h>

/******** Local functions ********/

static void show_at __PROTO((void));
static void disp_at __PROTO((struct at_type *, int));
static void show_all __PROTO((void));
static void show_autoscale __PROTO((void));
static void show_bars __PROTO((void));
static void show_border __PROTO((void));
static void show_boxwidth __PROTO((void));
static void show_fillstyle __PROTO((void));
static void show_clip __PROTO((void));
static void show_contour __PROTO((void));
static void show_dgrid3d __PROTO((void));
static void show_label_contours __PROTO((void));
#ifdef GP_MACROS
static void show_macros __PROTO((void));
#endif
static void show_mapping __PROTO((void));
static void show_dummy __PROTO((void));
static void show_format __PROTO((void));
static void show_styles __PROTO((const char *name, enum PLOT_STYLE style));
static void show_style __PROTO((void));
static void show_grid __PROTO((void));
static void show_zeroaxis __PROTO((AXIS_INDEX));
static void show_label __PROTO((int tag));
static void show_keytitle __PROTO((void));
static void show_key __PROTO((void));
static void show_logscale __PROTO((void));
static void show_offsets __PROTO((void));
static void show_margin __PROTO((void));
static void show_output __PROTO((void));
static void show_parametric __PROTO((void));
static void show_pm3d __PROTO((void));
static void show_palette __PROTO((void));
static void show_palette_rgbformulae __PROTO((void));
static void show_palette_fit2rgbformulae __PROTO((void));
static void show_palette_palette __PROTO((void));
static void show_palette_gradient __PROTO((void));
static void show_palette_colornames __PROTO((void));
static void show_colorbox __PROTO((void));
static void show_pointsize __PROTO((void));
static void show_encoding __PROTO((void));
static void show_decimalsign __PROTO((void));
static void show_fit __PROTO((void));
static void show_polar __PROTO((void));
static void show_print __PROTO((void));
static void show_angles __PROTO((void));
static void show_samples __PROTO((void));
static void show_isosamples __PROTO((void));
static void show_view __PROTO((void));
static void show_surface __PROTO((void));
static void show_hidden3d __PROTO((void));
static void show_increment __PROTO((void));
#ifdef EAM_HISTOGRAMS
static void show_histogram __PROTO((void));
#endif
#ifdef GNUPLOT_HISTORY
static void show_historysize __PROTO((void));
#endif
static void show_size __PROTO((void));
static void show_origin __PROTO((void));
static void show_term __PROTO((void));
static void show_tics __PROTO((TBOOLEAN showx, TBOOLEAN showy, TBOOLEAN showz, TBOOLEAN showx2, TBOOLEAN showy2, TBOOLEAN showcb));
static void show_mtics __PROTO((AXIS_INDEX));
static void show_timestamp __PROTO((void));
static void show_range __PROTO((AXIS_INDEX axis));
static void show_xyzlabel __PROTO((const char *name, const char *suffix, text_label * label));
static void show_title __PROTO((void));
static void show_axislabel __PROTO((AXIS_INDEX));
static void show_data_is_timedate __PROTO((AXIS_INDEX));
static void show_timefmt __PROTO((void));
static void show_locale __PROTO((void));
static void show_loadpath __PROTO((void));
static void show_fontpath __PROTO((void));
static void show_zero __PROTO((void));
static void show_datafile __PROTO((void));
#ifdef USE_MOUSE
static void show_mouse __PROTO((void));
#endif
static void show_plot __PROTO((void));
static void show_variables __PROTO((void));

static void show_linestyle __PROTO((int tag));
static void show_arrowstyle __PROTO((int tag));
static void show_arrow __PROTO((int tag));

static void show_ticdef __PROTO((AXIS_INDEX));
static void show_position __PROTO((struct position * pos));
static void show_functions __PROTO((void));

static char *num_to_str __PROTO((double r));

static int var_show_all = 0;

static char *save_locale = NULL;

/* following code segment appears over and over again */

#define SHOW_NUM_OR_TIME(x, axis) SAVE_NUM_OR_TIME(stderr, x, axis)

#define SHOW_ALL_NL { if (!var_show_all) (void) putc('\n',stderr); }

/******* The 'show' command *******/
void
show_command()
{
    /* show at is undocumented/hidden... */
    static char GPFAR showmess[] =
    "valid set options:  [] = choose one, {} means optional\n\n\
\t'all', 'angles', 'arrow', 'autoscale', 'bars', 'border', 'boxwidth', 'clip',\n\
\t'cntrparam', 'colorbox', 'contour', 'datafile', 'decimalsign','dgrid3d',\n\
\t'dummy', 'encoding', 'fit', 'fontpath', 'format', 'functions', 'grid',\n\
\t'hidden', 'isosamples', 'key', 'label', 'loadpath', 'locale', 'logscale',\n\
\t'mapping', 'margin', 'offsets', 'origin', 'output', 'plot',\n\
\t'palette', 'parametric', 'pm3d', 'pointsize', 'polar', 'print', '[rtuv]range',\n\
\t'samples', 'size', 'style', 'terminal', 'tics', 'timestamp',\n\
\t'timefmt', 'title', 'variables', 'version', 'view',\n\
\t'[xyz,cb]{2}label', '[xyz,cb]{2}range', '{m}[xyz,cb]{2}tics',\n\
\t'[xyz,cb]{2}[md]tics', '{[xyz]{2}}zeroaxis', '[xyz,cb]data', 'zero'";

    enum set_id token_found;
    struct value a;
    int tag =0;
    char *error_message = NULL;

    c_token++;

    token_found = lookup_table(&set_tbl[0],c_token);

#ifdef HAVE_LOCALE_H
    /* Report internal values in C locale (dot for decimal sign) */
       save_locale = gp_strdup(setlocale(LC_NUMERIC,NULL));
       setlocale(LC_NUMERIC,"C");
#endif

    /* rationalize c_token advancement stuff a bit: */
    if (token_found != S_INVALID)
	c_token++;

    switch(token_found) {
    case S_ACTIONTABLE:
	show_at();
	break;
    case S_ALL:
	show_all();
	break;
    case S_VERSION:
	show_version(stderr);
	break;
    case S_AUTOSCALE:
	show_autoscale();
	break;
    case S_BARS:
	show_bars();
	break;
    case S_BORDER:
	show_border();
	break;
    case S_BOXWIDTH:
	show_boxwidth();
	break;
    case S_CLIP:
	show_clip();
	break;
    case S_CLABEL:
	/* contour labels are shown with 'show contour' */
    case S_CONTOUR:
    case S_CNTRPARAM:
	show_contour();
	break;
    case S_DGRID3D:
	show_dgrid3d();
	break;
#ifdef GP_MACROS
    case S_MACROS:
	show_macros();
	break;
#endif
    case S_MAPPING:
	show_mapping();
	break;
    case S_DUMMY:
	show_dummy();
	break;
    case S_FORMAT:
	show_format();
	break;
    case S_FUNCTIONS:
	show_functions();
	break;
    case S_GRID:
	show_grid();
	break;
    case S_ZEROAXIS:
	show_zeroaxis(FIRST_X_AXIS);
	show_zeroaxis(FIRST_Y_AXIS);
	show_zeroaxis(FIRST_Z_AXIS);
	break;
    case S_XZEROAXIS:
	show_zeroaxis(FIRST_X_AXIS);
	break;
    case S_YZEROAXIS:
	show_zeroaxis(FIRST_Y_AXIS);
	break;
    case S_X2ZEROAXIS:
	show_zeroaxis(SECOND_X_AXIS);
	break;
    case S_Y2ZEROAXIS:
	show_zeroaxis(SECOND_Y_AXIS);
	break;
    case S_ZZEROAXIS:
	show_zeroaxis(FIRST_Z_AXIS);
	break;

#define CHECK_TAG_GT_ZERO					\
	if (!END_OF_COMMAND) {					\
	    tag = real(const_express(&a));			\
	    if (tag <= 0) {					\
		error_message =  "tag must be > zero";		\
		break;						\
		}						\
	}							\
	(void) putc('\n',stderr);

    case S_LABEL:
	CHECK_TAG_GT_ZERO;
	show_label(tag);
	break;
    case S_ARROW:
	CHECK_TAG_GT_ZERO;
	show_arrow(tag);
	break;
#ifdef BACKWARDS_COMPATIBLE
    case S_LINESTYLE:
	CHECK_TAG_GT_ZERO;
	show_linestyle(tag);
	break;
#else
    case S_LINESTYLE:
	error_message = "keyword 'linestyle' deprecated, use 'show style line'";
	break;
#endif
    case S_KEYTITLE:
	show_keytitle();
	break;
    case S_KEY:
	show_key();
	break;
    case S_LOGSCALE:
	show_logscale();
	break;
    case S_OFFSETS:
	show_offsets();
	break;

    case S_LMARGIN:		/* HBB 20010525: handle like 'show margin' */
    case S_RMARGIN:
    case S_TMARGIN:
    case S_BMARGIN:
    case S_MARGIN:
	show_margin();
	break;

    case SET_OUTPUT:
	show_output();
	break;
    case S_PARAMETRIC:
	show_parametric();
	break;
    case S_PM3D:
	show_pm3d();
	break;
    case S_PALETTE:
	show_palette();
	break;
    case S_COLORBOX:
	show_colorbox();
	break;
    case S_POINTSIZE:
	show_pointsize();
	break;
    case S_DECIMALSIGN:
	show_decimalsign();
	break;
    case S_ENCODING:
	show_encoding();
	break;
    case S_FIT:
	show_fit();
	break;
    case S_FONTPATH:
	show_fontpath();
	break;
    case S_POLAR:
	show_polar();
	break;
    case S_PRINT:
	show_print();
	break;
    case S_OBJECT:
#ifdef EAM_OBJECTS
	if (almost_equals(c_token,"rect$angle"))
	    c_token++;
	CHECK_TAG_GT_ZERO;
	save_rectangle(stderr,tag);
#endif
	break;
    case S_ANGLES:
	show_angles();
	break;
    case S_SAMPLES:
	show_samples();
	break;
    case S_ISOSAMPLES:
	show_isosamples();
	break;
    case S_VIEW:
	show_view();
	break;
#ifdef BACKWARDS_COMPATIBLE
    case S_DATA:
	/* HBB 20010525: re-implement old 'show data style' command */
	/* FIXME: 'show function style' is gone completely */
	if (almost_equals(c_token, "st$yle")) {
	    show_styles("Data", data_style);
	    c_token++;
	} else
	    error_message = "keyword 'style' expected after 'show data'";
	break;
#else
    case S_DATA:
	error_message = "keyword 'data' deprecated, use 'show style data'";
	break;
#endif
    case S_STYLE:
	show_style();
	break;
    case S_SURFACE:
	show_surface();
	break;
    case S_HIDDEN3D:
	show_hidden3d();
	break;
#ifdef GNUPLOT_HISTORY
    case S_HISTORYSIZE:
	show_historysize();
	break;
#endif
    case S_SIZE:
	show_size();
	break;
    case S_ORIGIN:
	show_origin();
	break;
    case S_TERMINAL:
	show_term();
	break;
    case S_TICS:
    case S_TICSLEVEL:
    case S_TICSCALE:
	show_tics(TRUE, TRUE, TRUE, TRUE, TRUE, TRUE);
	break;
    case S_MXTICS:
	show_mtics(FIRST_X_AXIS);
	break;
    case S_MYTICS:
	show_mtics(FIRST_Y_AXIS);
	break;
    case S_MZTICS:
	show_mtics(FIRST_Z_AXIS);
	break;
    case S_MCBTICS:
	show_mtics(COLOR_AXIS);
	break;
    case S_MX2TICS:
	show_mtics(SECOND_X_AXIS);
	break;
    case S_MY2TICS:
	show_mtics(SECOND_Y_AXIS);
	break;
    case S_TIMESTAMP:
	show_timestamp();
	break;
    case S_RRANGE:
	show_range(R_AXIS);
	break;
    case S_TRANGE:
	show_range(T_AXIS);
	break;
    case S_URANGE:
	show_range(U_AXIS);
	break;
    case S_VRANGE:
	show_range(V_AXIS);
	break;
    case S_XRANGE:
	show_range(FIRST_X_AXIS);
	break;
    case S_YRANGE:
	show_range(FIRST_Y_AXIS);
	break;
    case S_X2RANGE:
	show_range(SECOND_X_AXIS);
	break;
    case S_Y2RANGE:
	show_range(SECOND_Y_AXIS);
	break;
    case S_ZRANGE:
	show_range(FIRST_Z_AXIS);
	break;
    case S_CBRANGE:
	show_range(COLOR_AXIS);
	break;
    case S_TITLE:
	show_title();
	break;
    case S_XLABEL:
	show_axislabel(FIRST_X_AXIS);
	break;
    case S_YLABEL:
	show_axislabel(FIRST_Y_AXIS);
	break;
    case S_ZLABEL:
	show_axislabel(FIRST_Z_AXIS);
	break;
    case S_CBLABEL:
	show_axislabel(COLOR_AXIS);
	break;
    case S_X2LABEL:
	show_axislabel(SECOND_X_AXIS);
	break;
    case S_Y2LABEL:
	show_axislabel(SECOND_Y_AXIS);
	break;
    case S_XDATA:
	show_data_is_timedate(FIRST_X_AXIS);
	break;
    case S_YDATA:
	show_data_is_timedate(FIRST_Y_AXIS);
	break;
    case S_X2DATA:
	show_data_is_timedate(SECOND_X_AXIS);
	break;
    case S_Y2DATA:
	show_data_is_timedate(SECOND_Y_AXIS);
	break;
    case S_ZDATA:
	show_data_is_timedate(FIRST_Z_AXIS);
	break;
    case S_CBDATA:
	show_data_is_timedate(COLOR_AXIS);
	break;
    case S_TIMEFMT:
	show_timefmt();
	break;
    case S_LOCALE:
	show_locale();
	break;
    case S_LOADPATH:
	show_loadpath();
	break;
    case S_ZERO:
	show_zero();
	break;
    case S_DATAFILE:
	show_datafile();
	break;
#ifdef USE_MOUSE
    case S_MOUSE:
	show_mouse();
	break;
#endif
    case S_PLOT:
	show_plot();
#if defined(READLINE) || defined(HAVE_LIBREADLINE)
	if (!END_OF_COMMAND) {
	    if (almost_equals(c_token, "a$dd2history")) {
		c_token++;
		add_history(replot_line);
	    }
	}
#endif
	break;
    case S_VARIABLES:
	show_variables();
	break;
/* FIXME: get rid of S_*DTICS, S_*MTICS cases */
    case S_XTICS:
    case S_XDTICS:
    case S_XMTICS:
	show_tics(TRUE, FALSE, FALSE, TRUE, FALSE, FALSE);
	break;
    case S_YTICS:
    case S_YDTICS:
    case S_YMTICS:
	show_tics(FALSE, TRUE, FALSE, FALSE, TRUE, FALSE);
	break;
    case S_ZTICS:
    case S_ZDTICS:
    case S_ZMTICS:
	show_tics(FALSE, FALSE, TRUE, FALSE, FALSE, FALSE);
	break;
    case S_CBTICS:
    case S_CBDTICS:
    case S_CBMTICS:
	show_tics(FALSE, FALSE, FALSE, FALSE, FALSE, TRUE);
	break;
    case S_X2TICS:
    case S_X2DTICS:
    case S_X2MTICS:
	show_tics(FALSE, FALSE, FALSE, TRUE, FALSE, FALSE);
	break;
    case S_Y2TICS:
    case S_Y2DTICS:
    case S_Y2MTICS:
	show_tics(FALSE, FALSE, FALSE, FALSE, TRUE, FALSE);
	break;

#ifdef BACKWARDS_COMPATIBLE
	/* HBB 20010522: avoid triggering the 'default' parse error
	 * message for these commands --- they don't really exist, and
	 * shouldn't cause that message to appear */
    case S_NOMX2TICS:
    case S_NOMXTICS:
    case S_NOMY2TICS:
    case S_NOMYTICS:
    case S_NOMZTICS:
    case S_NOCBTICS:
    case S_NOMCBTICS:
    case S_NOCBDTICS:
    case S_NOCBMTICS:
    case S_NOX2DTICS:
    case S_NOX2MTICS:
    case S_NOX2TICS:
    case S_NOXDTICS:
    case S_NOXMTICS:
    case S_NOXTICS:
    case S_NOY2DTICS:
    case S_NOY2MTICS:
    case S_NOY2TICS:
    case S_NOYDTICS:
    case S_NOYMTICS:
    case S_NOYTICS:
    case S_NOZDTICS:
    case S_NOZMTICS:
    case S_NOZTICS:
	error_message = "'show' does not accept the 'no...' type of 'set' options";
	break;
#endif /* BACKWARDS_COMPATIBLE */

    case S_MULTIPLOT:
	fprintf(stderr,"multiplot mode is %s\n", multiplot ? "on" : "off");
	break;

    case S_TERMOPTIONS:
	fprintf(stderr,"Terminal options are '%s'\n",
		(term_options && *term_options) ? term_options : "[none]");
	break;

    /* HBB 20010525: 'set commands' that don't have an
     * accompanying 'show' version, for no particular reason: */
    /* --- such case now, all implemented. */

    case S_INVALID:
	error_message = showmess;
	break;
    default:
	error_message = "invalid or deprecated syntax";
	break;
    }

#ifdef HAVE_LOCALE_H
    if (save_locale) {
       setlocale(LC_NUMERIC,save_locale);
       free(save_locale);
       save_locale = NULL;
    }
#endif

    if (error_message)
	int_error(c_token,error_message);

    screen_ok = FALSE;
    (void) putc('\n', stderr);

#undef CHECK_TAG_GT_ZERO
}


/* process 'show actiontable|at' command
 * not documented
 */
static void
show_at()
{
    (void) putc('\n', stderr);
    disp_at(temp_at(), 0);
    c_token++;
}


/* called by show_at(), and recursively by itself */
static void
disp_at(struct at_type *curr_at, int level)
{
    int i, j;
    union argument *arg;

    for (i = 0; i < curr_at->a_count; i++) {
	(void) putc('\t', stderr);
	for (j = 0; j < level; j++)
	    (void) putc(' ', stderr);   /* indent */

	/* print name of instruction */

	fputs(ft[(int) (curr_at->actions[i].index)].f_name, stderr);
	arg = &(curr_at->actions[i].arg);

	/* now print optional argument */

	switch (curr_at->actions[i].index) {
	case PUSH:
	    fprintf(stderr, " %s\n", arg->udv_arg->udv_name);
	    break;
	case PUSHC:
	    (void) putc(' ', stderr);
	    disp_value(stderr, &(arg->v_arg), TRUE);
	    (void) putc('\n', stderr);
	    break;
	case PUSHD1:
	    fprintf(stderr, " %c dummy\n",
	    arg->udf_arg->udf_name[0]);
	    break;
	case PUSHD2:
	    fprintf(stderr, " %c dummy\n",
	    arg->udf_arg->udf_name[1]);
	    break;
	case CALL:
	    fprintf(stderr, " %s", arg->udf_arg->udf_name);
	    if (level < 6) {
		if (arg->udf_arg->at) {
		    (void) putc('\n', stderr);
		    disp_at(arg->udf_arg->at, level + 2);       /* recurse! */
		} else
		    fputs(" (undefined)\n", stderr);
	    } else
		(void) putc('\n', stderr);
	    break;
	case CALLN:
	    fprintf(stderr, " %s", arg->udf_arg->udf_name);
	    if (level < 6) {
		if (arg->udf_arg->at) {
		    (void) putc('\n', stderr);
		    disp_at(arg->udf_arg->at, level + 2);       /* recurse! */
		} else
		    fputs(" (undefined)\n", stderr);
	    } else
		(void) putc('\n', stderr);
	    break;
	case JUMP:
	case JUMPZ:
	case JUMPNZ:
	case JTERN:
	    fprintf(stderr, " +%d\n", arg->j_arg);
	    break;
	case DOLLARS:
	    fprintf(stderr, " %d\n", arg->v_arg.v.int_val);
	    break;
	default:
	    (void) putc('\n', stderr);
	}
    }
}


/* process 'show all' command */
static void
show_all()
{
    var_show_all = 1;

    show_version(stderr);
    show_autoscale();
    show_bars();
    show_border();
    show_boxwidth();
    show_clip();
    show_label_contours();
    show_contour();
    show_dgrid3d();
#ifdef GP_MACROS
    show_macros();
#endif
    show_mapping();
    show_dummy();
    show_format();
    show_style();
    show_grid();
    show_zeroaxis(FIRST_X_AXIS);
    show_zeroaxis(FIRST_Y_AXIS);
    show_zeroaxis(FIRST_Z_AXIS);
    show_label(0);
    show_arrow(0);
    show_keytitle();
    show_key();
    show_logscale();
    show_offsets();
    show_margin();
    show_output();
    show_print();
    show_parametric();
    show_palette();
    show_colorbox();
    show_pm3d();
    show_pointsize();
    show_encoding();
    show_decimalsign();
    show_fit();
    show_polar();
    show_angles();
#ifdef EAM_OBJECTS
    save_rectangle(stderr,0);
#endif
    show_samples();
    show_isosamples();
    show_view();
    show_surface();
    show_hidden3d();
#ifdef GNUPLOT_HISTORY
    show_historysize();
#endif
    show_size();
    show_origin();
    show_term();
    show_tics(TRUE,TRUE,TRUE,TRUE,TRUE,TRUE);
    show_mtics(FIRST_X_AXIS);
    show_mtics(FIRST_Y_AXIS);
    show_mtics(FIRST_Z_AXIS);
    show_mtics(SECOND_X_AXIS);
    show_mtics(SECOND_Y_AXIS);
    show_xyzlabel("", "time", &timelabel);
    if (parametric || polar) {
	if (!is_3d_plot)
	    show_range(T_AXIS);
	else {
	    show_range(U_AXIS);
	    show_range(V_AXIS);
	}
    }
    show_range(FIRST_X_AXIS);
    show_range(FIRST_Y_AXIS);
    show_range(SECOND_X_AXIS);
    show_range(SECOND_Y_AXIS);
    show_range(FIRST_Z_AXIS);
    show_title();
    show_axislabel(FIRST_X_AXIS );
    show_axislabel(FIRST_Y_AXIS );
    show_axislabel(FIRST_Z_AXIS );
    show_axislabel(SECOND_X_AXIS);
    show_axislabel(SECOND_Y_AXIS);
    show_data_is_timedate(FIRST_X_AXIS);
    show_data_is_timedate(FIRST_Y_AXIS);
    show_data_is_timedate(SECOND_X_AXIS);
    show_data_is_timedate(SECOND_Y_AXIS);
    show_data_is_timedate(FIRST_Z_AXIS);
    show_timefmt();
    show_loadpath();
    show_fontpath();
    show_locale();
    show_zero();
    show_datafile();
#ifdef USE_MOUSE
    show_mouse();
#endif
    show_plot();
    show_variables();
    show_functions();

    var_show_all = 0;
}


/* process 'show version' command */
void
show_version(FILE *fp)
{
    /* If printed to a file, we prefix everything with
     * a hash mark to comment out the version information.
     */
    char prefix[6];		/* "#    " */
    char *p = prefix;

    prefix[0] = '#';
    prefix[1] = prefix[2] = prefix[3] = prefix[4] = ' ';
    prefix[5] = NUL;

    /* Construct string of configuration options used to build */
    /* this particular copy of gnuplot. Executed once only.    */
    if (!compile_options) {
	compile_options = gp_alloc(1024,"compile_options");

	{
	    /* The following code could be a lot simpler if
	     * it wasn't for Borland's broken compiler ...
	     */
	    const char * rdline =
#ifdef READLINE
		"+"
#else
		"-"
#endif
		"READLINE  ";

	    const char *gnu_rdline =
#ifdef HAVE_LIBREADLINE
		"+"
#else
		"-"
#endif
		"LIBREADLINE  "
#ifdef GNUPLOT_HISTORY
		"+"
#else
		"-"
#endif
		"HISTORY  "
		"";

	    const char *libgd =
#ifdef HAVE_LIBGD
# ifdef HAVE_GD_PNG
		"+GD_PNG  "
# endif
# ifdef HAVE_GD_JPEG
		"+GD_JPEG  "
# endif
# ifdef HAVE_GD_TTF
		"+GD_TTF  "
# endif
# ifdef HAVE_GD_GIF
		"+GD_GIF  "
# endif
# ifdef GIF_ANIMATION
		"+ANIMATION  "
# endif
#else
		"-LIBGD  "
#endif
		"";

	    const char *linuxvga =
#ifdef LINUXVGA
		"+LINUXVGA  "
#endif
		"";

	    const char *compatibility =
#ifdef BACKWARDS_COMPATIBLE
		"+BACKWARDS_COMPATIBILITY  "
#else
		"-BACKWARDS_COMPATIBILITY  "
#endif
		"";

	    const char *binary_files =
#ifdef BINARY_DATA_FILE
		"+BINARY_DATA  "
#endif
		"";

	    const char *nocwdrc =
#ifdef NOCWDRC
		"+"
#else
		"-"
#endif
		"NOCWDRC  ";

	    const char *x11 =
#ifdef X11
		"+X11  "
#endif
#ifdef BINARY_X11_POLYGON
		"+X11_POLYGON  "
#endif
#ifdef USE_X11_MULTIBYTE
		"+MULTIBYTE  "
#endif
		"";

	    const char *use_mouse =
#ifdef USE_MOUSE
		"+USE_MOUSE  "
#endif
		"";

	    const char *unixplot =
#ifdef UNIXPLOT
		"+UNIXPLOT  "
#endif
		"";

	    const char *gnugraph =
#ifdef GNUGRAPH
		"+GNUGRAPH  "
#endif
		"";

	    const char *hiddenline =
#ifdef HIDDEN3D_QUADTREE
		"+HIDDEN3D_QUADTREE  "
#else
# ifdef HIDDEN3D_GRIDBOX
		"+HIDDEN3D_GRIDBOX  "
# endif
#endif
		"";

	    const char *plotoptions=
#ifdef EAM_DATASTRINGS
		"+DATASTRINGS  "
#endif
#ifdef EAM_HISTOGRAMS
		"+HISTOGRAMS  "
#endif
#ifdef EAM_OBJECTS
		"+OBJECTS  "
#endif
#ifdef GP_STRING_VARS
		"+STRINGVARS  "
#endif
#ifdef GP_MACROS
		"+MACROS  "
#endif
# ifdef THIN_PLATE_SPLINES_GRID
		"+THIN_SPLINES  "
# endif
#ifdef WITH_IMAGE
		"+IMAGE  "
#endif
	    "";

	    sprintf(compile_options, "\
%s%s%s%s\n\
%s%s\n\
%s%s%s%s%s%s\n%s\n",
		    rdline, gnu_rdline, compatibility, binary_files,
		    libgd, linuxvga,
		    nocwdrc, x11, use_mouse, unixplot, gnugraph, hiddenline,
		    plotoptions);
	}

	compile_options = gp_realloc(compile_options, strlen(compile_options)+1, "compile_options");
    }

    /* The only effect of fp == NULL is to load the compile_options string */
    if (fp == NULL)
	return;
	
    if (fp == stderr) {
	/* No hash mark - let p point to the trailing '\0' */
	p += sizeof(prefix) - 1;
    } else {
#ifdef BINDIR
# ifdef X11
	fprintf(fp, "#!%s/gnuplot -persist\n#\n", BINDIR);
#  else
	fprintf(fp, "#!%s/gnuplot\n#\n", BINDIR);
# endif				/* not X11 */
#endif /* BINDIR */
    }

    fprintf(fp, "%s\n\
%s\t%s\n\
%s\tVersion %s patchlevel %s\n\
%s\tlast modified %s\n\
%s\tSystem: %s %s\n\
%s\n\
%s\t%s\n\
%s\tThomas Williams, Colin Kelley and many others\n\
%s\n\
%s\tType `help` to access the on-line reference manual.\n\
%s\tThe gnuplot FAQ is available from %s\n\
%s\n\
%s\tSend bug reports and suggestions to <%s>\n\
%s\n",
	    p,			/* empty line */
	    p, PROGRAM,
	    p, gnuplot_version, gnuplot_patchlevel,
	    p, gnuplot_date,
	    p, os_name, os_rel,
	    p,			/* empty line */
	    p, gnuplot_copyright,
	    p,			/* authors */
	    p,			/* empty line */
	    p,			/* Type `help` */
	    p, faq_location,
	    p,			/* empty line */
	    p, bug_email,
	    p);			/* empty line */


    /* show version long */
    if (almost_equals(c_token, "l$ong")) {
	char *helpfile = NULL;

	c_token++;
	fprintf(stderr, "Compile options:\n%s\n", compile_options);

	if ((helpfile = getenv("GNUHELP")) == NULL) {
#if defined(ATARI) || defined(MTOS)
	    if ((helpfile = user_gnuplotpath) == NULL) {
		helpfile = HELPFILE;
	    }
#else
	    helpfile = HELPFILE;
#endif
	}

#ifdef X11
	{
	    char *driverdir = getenv("GNUPLOT_DRIVER_DIR");

	    if (driverdir == NULL)
		driverdir = X11_DRIVER_DIR;
	    fprintf(stderr, "\
DRIVER_DIR     = \"%s\"\n", driverdir);
	}
#endif

#ifdef GNUPLOT_PS_DIR
	{
	   fprintf(stderr, "GNUPLOT_PS_DIR = \"%s\"\n", GNUPLOT_PS_DIR);
	}
#endif

	fprintf(stderr, "HELPFILE       = \"%s\"\n", helpfile);
#if 0
	/* These are redundant. We just printed them 5 lines ago. */
	fprintf(stderr, "CONTACT        = <%s>\n", bug_email);
	fprintf(stderr, "HELPMAIL       = <%s>\n", help_email);
#endif

    }
}


/* process 'show autoscale' command */
static void
show_autoscale()
{
    SHOW_ALL_NL;

#define SHOW_AUTOSCALE(axis) {						      \
	t_autoscale ascale = axis_array[axis].set_autoscale;		      \
									      \
	fprintf(stderr, "\t%s: %s%s%s%s%s, ",				      \
		axis_defaults[axis].name,				      \
		(ascale & AUTOSCALE_BOTH) ? "ON" : "OFF",		      \
		((ascale & AUTOSCALE_BOTH) == AUTOSCALE_MIN) ? " (min)" : "", \
		((ascale & AUTOSCALE_BOTH) == AUTOSCALE_MAX) ? " (max)" : "", \
		(ascale & AUTOSCALE_FIXMIN) ? " (fixmin)" : "",		      \
		(ascale & AUTOSCALE_FIXMAX) ? " (fixmax)" : "");	      \
    }

    fputs("\tautoscaling is ", stderr);
    if (parametric) {
	if (is_3d_plot) {
	    SHOW_AUTOSCALE(T_AXIS);
	} else {
	    SHOW_AUTOSCALE(U_AXIS);
	    SHOW_AUTOSCALE(V_AXIS);
	}
    }

    if (polar) {
	SHOW_AUTOSCALE(R_AXIS)
    }

    SHOW_AUTOSCALE(FIRST_X_AXIS );
    SHOW_AUTOSCALE(FIRST_Y_AXIS );
    fputs("\n\t               ", stderr);
    SHOW_AUTOSCALE(SECOND_X_AXIS);
    SHOW_AUTOSCALE(SECOND_Y_AXIS);
    fputs("\n\t               ", stderr);
    SHOW_AUTOSCALE(FIRST_Z_AXIS );
    SHOW_AUTOSCALE(COLOR_AXIS);
#undef SHOW_AUTOSCALE

}


/* process 'show bars' command */
static void
show_bars()
{
    SHOW_ALL_NL;

    /* I really like this: "terrorbars" ;-) */
    if (bar_size > 0.0)
	fprintf(stderr, "\terrorbars are plotted with bars of size %f\n",
		bar_size);
    else
	fputs("\terrors are plotted without bars\n", stderr);
}


/* process 'show border' command */
static void
show_border()
{
    SHOW_ALL_NL;

    if (!draw_border)
	fprintf(stderr, "\tborder is not drawn\n");
    else {
	fprintf(stderr, "\tborder %d is drawn in %s of the plot elements with\n\t ",
	    draw_border, border_layer == 0 ? "back" : "front");
	save_linetype(stderr, &border_lp, FALSE);
	fputc('\n',stderr);
    }
}


/* process 'show boxwidth' command */
static void
show_boxwidth()
{
    SHOW_ALL_NL;

    if (boxwidth < 0.0)
	fputs("\tboxwidth is auto\n", stderr);
    else {
	fprintf(stderr, "\tboxwidth is %g %s\n", boxwidth,
		(boxwidth_is_absolute) ? "absolute" : "relative");
    }
}


/* process 'show fillstyle' command */
static void
show_fillstyle()
{
    SHOW_ALL_NL;

    switch(default_fillstyle.fillstyle) {
    case FS_SOLID:
        fprintf(stderr,
	    "\tFill style is solid colour with density %f",
	    default_fillstyle.filldensity/100.0);
        break;
    case FS_PATTERN:
        fprintf(stderr,
	    "\tFill style uses patterns starting at %d",
	    default_fillstyle.fillpattern);
        break;
    default:
        fprintf(stderr, "\tFill style is empty");
    }
    switch(default_fillstyle.border_linetype) {
    case LT_NODRAW:
	fprintf(stderr," with no border\n");
	break;
    case LT_UNDEFINED:
	fprintf(stderr," with border\n");
	break;
    default:
	fprintf(stderr," with border linetype %d\n",default_fillstyle.border_linetype+1);
	break;
    }
}


/* process 'show clip' command */
static void
show_clip()
{
    SHOW_ALL_NL;

    fprintf(stderr, "\tpoint clip is %s\n", (clip_points) ? "ON" : "OFF");

    if (clip_lines1)
	fputs("\tdrawing and clipping lines between inrange and outrange points\n", stderr);
    else
	fputs("\tnot drawing lines between inrange and outrange points\n", stderr);

    if (clip_lines2)
	fputs("\tdrawing and clipping lines between two outrange points\n", stderr);
    else
	fputs("\tnot drawing lines between two outrange points\n", stderr);
}


/* process 'show cntrparam|contour' commands */
static void
show_contour()
{
    SHOW_ALL_NL;

    fprintf(stderr, "\tcontour for surfaces are %s",
	    (draw_contour) ? "drawn" : "not drawn\n");

    if (draw_contour) {
	fprintf(stderr, " in %d levels on ", contour_levels);
	switch (draw_contour) {
	case CONTOUR_BASE:
	    fputs("grid base\n", stderr);
	    break;
	case CONTOUR_SRF:
	    fputs("surface\n", stderr);
	    break;
	case CONTOUR_BOTH:
	    fputs("grid base and surface\n", stderr);
	    break;
	case CONTOUR_NONE:
	    /* should not happen --- be easy: don't complain... */
	    break;
	}
	switch (contour_kind) {
	case CONTOUR_KIND_LINEAR:
	    fputs("\t\tas linear segments\n", stderr);
	    break;
	case CONTOUR_KIND_CUBIC_SPL:
	    fprintf(stderr, "\t\tas cubic spline interpolation segments with %d pts\n", contour_pts);
	    break;
	case CONTOUR_KIND_BSPLINE:
	    fprintf(stderr, "\t\tas bspline approximation segments of order %d with %d pts\n", contour_order, contour_pts);
	    break;
	}
	switch (contour_levels_kind) {
	case LEVELS_AUTO:
	    fprintf(stderr, "\t\tapprox. %d automatic levels\n", contour_levels);
	    break;
	case LEVELS_DISCRETE:
	    {
		int i;
		fprintf(stderr, "\t\t%d discrete levels at ", contour_levels);
		fprintf(stderr, "%g", contour_levels_list[0]);
		for (i = 1; i < contour_levels; i++)
		    fprintf(stderr, ",%g ", contour_levels_list[i]);
		putc('\n', stderr);
		break;
	    }
	case LEVELS_INCREMENTAL:
	    fprintf(stderr, "\t\t%d incremental levels starting at %g, step %g, end %g\n", contour_levels, contour_levels_list[0],
		    contour_levels_list[1],
		    contour_levels_list[0] + (contour_levels - 1) * contour_levels_list[1]);
	    /* contour-levels counts both ends */
	    break;
	}
	/* fprintf(stderr,"\t\tcontour line types are %s\n", label_contours ? "varied" : "all the same"); */
	show_label_contours();
    }
}


/* called by show_contour() */
static void
show_label_contours()
{
    if (label_contours)
	fprintf(stderr, "\tcontour line types are varied & labeled with format '%s'\n", contour_format);
    else
	fputs("\tcontour line types are all the same\n", stderr);
}


/* process 'show dgrid3d' command */
static void
show_dgrid3d()
{
    SHOW_ALL_NL;

    if (dgrid3d)
	fprintf(stderr, "\
\tdata grid3d is enabled for mesh of size %dx%d, norm=%d\n",
		dgrid3d_row_fineness,
		dgrid3d_col_fineness,
		dgrid3d_norm_value);
    else
	fputs("\tdata grid3d is disabled\n", stderr);
}

#ifdef GP_MACROS
/* process 'show macros' command */
static void
show_macros()
{
    SHOW_ALL_NL;
    fprintf(stderr,"\tcommand line macros will %sbe expanded\n",
	expand_macros ? "" : "not ");
}
#endif

/* process 'show mapping' command */
static void
show_mapping()
{
    SHOW_ALL_NL;

    fputs("\tmapping for 3-d data is ", stderr);

    switch (mapping3d) {
    case MAP3D_CARTESIAN:
	fputs("cartesian\n", stderr);
	break;
    case MAP3D_SPHERICAL:
	fputs("spherical\n", stderr);
	break;
    case MAP3D_CYLINDRICAL:
	fputs("cylindrical\n", stderr);
	break;
    }
}


/* process 'show dummy' command */
static void
show_dummy()
{
    SHOW_ALL_NL;

    fprintf(stderr, "\tdummy variables are \"%s\" and \"%s\"\n",
	    set_dummy_var[0], set_dummy_var[1]);
}


/* process 'show format' command */
static void
show_format()
{
    SHOW_ALL_NL;

    fprintf(stderr, "\ttic format is:\n");
#define SHOW_FORMAT(_axis)						\
    fprintf(stderr, "\t  %s-axis: \"%s\"\n", axis_defaults[_axis].name,	\
	    conv_text(axis_array[_axis].formatstring));
    SHOW_FORMAT(FIRST_X_AXIS );
    SHOW_FORMAT(FIRST_Y_AXIS );
    SHOW_FORMAT(SECOND_X_AXIS);
    SHOW_FORMAT(SECOND_Y_AXIS);
    SHOW_FORMAT(FIRST_Z_AXIS );
    SHOW_FORMAT(COLOR_AXIS);
#undef SHOW_FORMAT
}


/* process 'show style' sommand */
static void
show_style()
{
    struct value a;
    int tag = 0;

#define CHECK_TAG_GT_ZERO					\
	if (!END_OF_COMMAND) {					\
	    tag = real(const_express(&a));			\
	    if (tag <= 0)					\
		int_error(c_token,"tag must be > zero");	\
	}

    switch(lookup_table(&show_style_tbl[0],c_token)){
    case SHOW_STYLE_DATA:
	SHOW_ALL_NL;
	show_styles("Data",data_style);
	c_token++;
	break;
    case SHOW_STYLE_FUNCTION:
	SHOW_ALL_NL;
	show_styles("Functions", func_style);
	c_token++;
	break;
    case SHOW_STYLE_LINE:
	c_token++;
	CHECK_TAG_GT_ZERO;
	show_linestyle(tag);
	break;
    case SHOW_STYLE_FILLING:
	show_fillstyle();
	c_token++;
	break;
    case SHOW_STYLE_INCREMENT:
	show_increment();
	c_token++;
	break;
#ifdef EAM_HISTOGRAMS
    case SHOW_STYLE_HISTOGRAM:
	show_histogram();
	c_token++;
	break;
#endif
    case SHOW_STYLE_ARROW:
	c_token++;
	CHECK_TAG_GT_ZERO;
	show_arrowstyle(tag);
	break;
    default:
	/* show all styles */
	show_styles("Data",data_style);
	show_styles("Functions", func_style);
	show_linestyle(0);
	show_fillstyle();
	show_increment();
#ifdef EAM_HISTOGRAMS
	show_histogram();
#endif
	show_arrowstyle(0);
#ifdef EAM_OBJECTS
	/* Fall through (FIXME: this is ugly) */
    case SHOW_STYLE_RECTANGLE:
	fprintf(stderr, "\tRectangle style is %s, fill color ",
		default_rectangle.layer > 0 ? "front" : 
		default_rectangle.layer < 0 ? "behind" : "back");
	if (default_rectangle.lp_properties.use_palette)
	    save_pm3dcolor(stderr, &default_rectangle.lp_properties.pm3d_color);
	else if (default_rectangle.lp_properties.l_type == LT_BACKGROUND)
	    fprintf(stderr, "background");
	else
	    fprintf(stderr, "lt %d",default_rectangle.lp_properties.l_type+1);
	fprintf(stderr, ", lw %.1f ", default_rectangle.lp_properties.l_width);
	fprintf(stderr, ", fillstyle");
	save_fillstyle(stderr, &default_rectangle.fillstyle);
	c_token++;
#endif
	break;
    }
#undef CHECK_TAG_GT_ZERO
}

/* called by show_data() and show_func() */
static void
show_styles(const char *name, enum PLOT_STYLE style)
{
    fprintf(stderr, "\t%s are plotted with ", name);
    save_data_func_style(stderr, name, style);
}


/* called by show_func() */
static void
show_functions()
{
    struct udft_entry *udf = first_udf;

    fputs("\n\tUser-Defined Functions:\n", stderr);

    while (udf) {
	if (udf->definition)
	    fprintf(stderr, "\t%s\n", udf->definition);
	else
	    fprintf(stderr, "\t%s is undefined\n", udf->udf_name);
	udf = udf->next_udf;
    }
}


/* process 'show grid' command */
static void
show_grid()
{
    SHOW_ALL_NL;

    if (! some_grid_selected()) {
	fputs("\tgrid is OFF\n", stderr);
	return;
    }

#if 0
    /* Old method of accessing grid choices */
    fprintf(stderr, "\t%s grid drawn at%s%s%s%s%s%s%s%s%s%s%s%s tics\n",
	    (polar_grid_angle != 0) ? "Polar" : "Rectangular",
	    grid_selection & GRID_X ? " x" : "",
	    grid_selection & GRID_Y ? " y" : "",
	    grid_selection & GRID_Z ? " z" : "",
	    grid_selection & GRID_X2 ? " x2" : "",
	    grid_selection & GRID_Y2 ? " y2" : "",
	    grid_selection & GRID_MX ? " mx" : "",
	    grid_selection & GRID_MY ? " my" : "",
	    grid_selection & GRID_MZ ? " mz" : "",
	    grid_selection & GRID_MX2 ? " mx2" : "",
	    grid_selection & GRID_MY2 ? " my2" : "",
	    grid_selection & GRID_CB ? " cb" : "",
	    grid_selection & GRID_MCB ? " mcb" : ""
	    );
#else
    /* HBB 20010806: new storage method for grid options: */
    fprintf(stderr, "\t%s grid drawn at",
	    (polar_grid_angle != 0) ? "Polar" : "Rectangular");
#define SHOW_GRID(axis)						\
    if (axis_array[axis].gridmajor)				\
	fprintf(stderr, " %s", axis_defaults[axis].name);	\
    if (axis_array[axis].gridminor)				\
	fprintf(stderr, " m%s", axis_defaults[axis].name);
    SHOW_GRID(FIRST_X_AXIS );
    SHOW_GRID(FIRST_Y_AXIS );
    SHOW_GRID(SECOND_X_AXIS);
    SHOW_GRID(SECOND_Y_AXIS);
    SHOW_GRID(FIRST_Z_AXIS );
    SHOW_GRID(COLOR_AXIS);
#undef SHOW_GRID
    fputs(" tics\n", stderr);
#endif /* 0/1 */

    fprintf(stderr, "\tMajor grid drawn with");
    save_linetype(stderr, &(grid_lp), FALSE);
    fprintf(stderr, "\n\tMinor grid drawn with");
    save_linetype(stderr, &(mgrid_lp), FALSE);
    fputc('\n', stderr);
    if (polar_grid_angle)
	fprintf(stderr, "\tGrid radii drawn every %f %s\n",
		polar_grid_angle / ang2rad,
		(ang2rad == 1.0) ? "radians" : "degrees");

    fprintf(stderr, "\tGrid drawn at %s\n", (grid_layer==-1) ? "default layer" : ((grid_layer==0) ? "back" : "front"));
}


/* process 'show {x|y|z}zeroaxis' command */
static void
show_zeroaxis(AXIS_INDEX axis)
{
    SHOW_ALL_NL;

    if (axis_array[axis].zeroaxis.l_type > LT_NODRAW) {
	fprintf(stderr, "\t%szeroaxis is drawn with", axis_defaults[axis].name);
	save_linetype(stderr, &(axis_array[axis].zeroaxis), FALSE);
	fputc('\n',stderr);
    } else
	fprintf(stderr, "\t%szeroaxis is OFF\n", axis_defaults[axis].name);

    if ((axis / SECOND_AXES) == 0) {
	/* this is a 'first' axis. To output secondary axis, call self
	 * recursively: */
	show_zeroaxis(axis + SECOND_AXES);
    }
}

/* Show label number <tag> (0 means show all) */
static void
show_label(int tag)
{
    struct text_label *this_label;
    TBOOLEAN showed = FALSE;

    for (this_label = first_label; this_label != NULL;
	 this_label = this_label->next) {
	if (tag == 0 || tag == this_label->tag) {
	    showed = TRUE;
	    fprintf(stderr, "\tlabel %d \"%s\" at ",
		    this_label->tag,
		    (this_label->text==NULL) ? "" : conv_text(this_label->text));
	    show_position(&this_label->place);
	    switch (this_label->pos) {
	    case LEFT:{
		    fputs(" left", stderr);
		    break;
		}
	    case CENTRE:{
		    fputs(" centre", stderr);
		    break;
		}
	    case RIGHT:{
		    fputs(" right", stderr);
		    break;
		}
	    }
	    if (this_label->rotate)
	    	fprintf(stderr, " rotated by %d degrees (if possible)", this_label->rotate);
	    else
	    	fprintf(stderr, " not rotated");
	    fprintf(stderr, " %s ", this_label->layer ? "front" : "back");
	    if (this_label->font != NULL)
		fprintf(stderr, " font \"%s\"", this_label->font);
	    if (this_label->textcolor.type)
		save_textcolor(stderr, &this_label->textcolor);
	    if (this_label->noenhanced)
		fprintf(stderr, " noenhanced");
	    if (this_label->lp_properties.pointflag == 0)
		fprintf(stderr, " nopoint");
	    else {
		fprintf(stderr, " point with color of");
		save_linetype(stderr, &(this_label->lp_properties), TRUE);
		show_position(&this_label->offset);
	    }

	    /* Entry font added by DJL */
	    fputc('\n', stderr);
	}
    }
    if (tag > 0 && !showed)
	int_error(c_token, "label not found");
}


/* Show arrow number <tag> (0 means show all) */
static void
show_arrow(int tag)
{
    struct arrow_def *this_arrow;
    TBOOLEAN showed = FALSE;

    for (this_arrow = first_arrow; this_arrow != NULL;
	 this_arrow = this_arrow->next) {
	if (tag == 0 || tag == this_arrow->tag) {
	    showed = TRUE;
	    fprintf(stderr, "\tarrow %d, %s %s %s",
		    this_arrow->tag,
		    arrow_head_names[this_arrow->arrow_properties.head],
		    ( (this_arrow->arrow_properties.head_filled==2) ? "filled" :
		      ( (this_arrow->arrow_properties.head_filled==1) ? "empty" :
			"nofilled" )),
		    this_arrow->arrow_properties.layer ? "front" : "back");
	    save_linetype(stderr, &(this_arrow->arrow_properties.lp_properties), FALSE);
	    fprintf(stderr, "\n\t  from ");
	    show_position(&this_arrow->start);
	    fputs(this_arrow->relative ? " rto " : " to ", stderr);
	    show_position(&this_arrow->end);
	    if (this_arrow->arrow_properties.head_length > 0) {
		static char *msg[] =
		{"(first x axis) ", "(second x axis) ", "(graph units) ", "(screen units) "};
		fprintf(stderr,"\n\t  arrow head: length %s%g, angle %g deg",
		   this_arrow->arrow_properties.head_lengthunit == first_axes ? "" : msg[this_arrow->arrow_properties.head_lengthunit],
		   this_arrow->arrow_properties.head_length,
                   this_arrow->arrow_properties.head_angle);
		if (this_arrow->arrow_properties.head_filled!=0)
		    fprintf(stderr,", backangle %g deg",
			    this_arrow->arrow_properties.head_backangle);
	    }
	    putc('\n', stderr);
	}
    }
    if (tag > 0 && !showed)
	int_error(c_token, "arrow not found");
}


/* process 'show keytitle' command */
static void
show_keytitle()
{
    legend_key *key = &keyT;
    SHOW_ALL_NL;

    fprintf(stderr, "\tkeytitle is \"%s\"\n", conv_text(key->title));
}


/* process 'show key' command */
static void
show_key()
{
    legend_key *key = &keyT;

    SHOW_ALL_NL;

    if (!(key->visible)) {
	fputs("\
\tkey is OFF\n", stderr);
	return;
    }

    switch (key->region) {
    case GPKEY_AUTO_INTERIOR_LRTBC:
    case GPKEY_AUTO_EXTERIOR_LRTBC:
    case GPKEY_AUTO_EXTERIOR_MARGIN: {
	fputs("\tkey is ON, position: ", stderr);
	if (!(key->region == GPKEY_AUTO_EXTERIOR_MARGIN && (key->margin == GPKEY_TMARGIN || key->margin == GPKEY_BMARGIN))) {
	    if (key->vpos == JUST_TOP)
		fputs("top", stderr);
	    else if (key->vpos == JUST_BOT)
		fputs("bottom", stderr);
	    else
		fputs("center", stderr);
	}
	if (!(key->region == GPKEY_AUTO_EXTERIOR_MARGIN && (key->margin == GPKEY_LMARGIN || key->margin == GPKEY_RMARGIN))) {
	    if (key->hpos == LEFT)
		fputs(" left", stderr);
	    else if (key->hpos == RIGHT)
		fputs(" right", stderr);
	    else if (key->vpos != JUST_CENTRE) /* Don't print "center" twice. */
		fputs(" center", stderr);
	}
	if (key->stack_dir == GPKEY_VERTICAL) {
	    fputs(" vertical", stderr);
	} else {
	    fputs(" horizontal", stderr);
	}
	if (key->region == GPKEY_AUTO_INTERIOR_LRTBC)
	    fputs(" inside", stderr);
	else if (key->region == GPKEY_AUTO_EXTERIOR_LRTBC)
	    fputs(" outside", stderr);
	else {
	    switch (key->margin) {
	    case GPKEY_TMARGIN:
		fputs(" tmargin", stderr);
		break;
	    case GPKEY_BMARGIN:
		fputs(" bmargin", stderr);
		break;
	    case GPKEY_LMARGIN:
		fputs(" lmargin", stderr);
		break;
	    case GPKEY_RMARGIN:
		fputs(" rmargin", stderr);
		break;
	    }
	}
	fputs("\n", stderr);
	break;
    }
    case GPKEY_USER_PLACEMENT:
	fputs("\tkey is at ", stderr);
	show_position(&key->user_pos);
	putc('\n', stderr);
	break;
    }

    fprintf(stderr, "\
\tkey is %s justified, %sreversed, %sinverted, %senhanced and ",
	    key->just == GPKEY_LEFT ? "left" : "right",
	    key->reverse ? "" : "not ",
	    key->invert ? "" : "not ",
	    key->enhanced ? "" : "not ");
    if (key->box.l_type > LT_NODRAW) {
	fprintf(stderr, "boxed\n\twith ");
	save_linetype(stderr, &(key->box), FALSE);
	fputc('\n', stderr);
    } else
	fprintf(stderr, "not boxed\n");

    fprintf(stderr, "\
\tsample length is %g characters\n\
\tvertical spacing is %g characters\n\
\twidth adjustment is %g characters\n\
\theight adjustment is %g characters\n\
\tcurves are%s automatically titled %s\n\
\tkey title is \"%s\"\n",
	    key->swidth,
	    key->vert_factor,
	    key->width_fix,
	    key->height_fix,
	    key->auto_titles ? "" : " not",
	    key->auto_titles == FILENAME_KEYTITLES ? "with filename" :
	    key->auto_titles == COLUMNHEAD_KEYTITLES
	    ? "with column header" : "",
	    key->title);
}


static void
show_position(struct position *pos)
{
    static const char *msg[] = { "(first axes) ", "(second axes) ",
				 "(graph units) ", "(screen units) ",
				 "(character units) "};
 
    assert(first_axes == 0 && second_axes == 1 && graph == 2 && screen == 3 &&
	   character == 4);

    fprintf(stderr, "(%s%g, %s%g, %s%g)",
	    pos->scalex == first_axes ? "" : msg[pos->scalex], pos->x,
	    pos->scaley == pos->scalex ? "" : msg[pos->scaley], pos->y,
	    pos->scalez == pos->scaley ? "" : msg[pos->scalez], pos->z);

}


/* process 'show logscale' command */
static void
show_logscale()
{
    int count = 0;

    SHOW_ALL_NL;

#define SHOW_LOG(axis)							\
    {									\
	if (axis_array[axis].log) 					\
	    fprintf(stderr, "%s %s (base %g)",				\
		    !count++ ? "\tlogscaling" : " and",			\
		    axis_defaults[axis].name,axis_array[axis].base);	\
    }
    SHOW_LOG(FIRST_X_AXIS );
    SHOW_LOG(FIRST_Y_AXIS );
    SHOW_LOG(FIRST_Z_AXIS );
    SHOW_LOG(SECOND_X_AXIS);
    SHOW_LOG(SECOND_Y_AXIS);
    SHOW_LOG(COLOR_AXIS );
#undef SHOW_LOG

    if (count == 0)
	fputs("\tno logscaling\n", stderr);
    else if (count == 1)
	fputs(" only\n", stderr);
    else
	putc('\n', stderr);
}


/* process 'show offsets' command */
static void
show_offsets()
{
    SHOW_ALL_NL;

    fprintf(stderr, "\toffsets are %g, %g, %g, %g\n", loff, roff, toff, boff);
}


/* process 'show margin' command */
static void
show_margin()
{
    SHOW_ALL_NL;

    if (lmargin >= 0)
	fprintf(stderr, "\tlmargin is set to %g\n", lmargin);
    else
	fputs("\tlmargin is computed automatically\n", stderr);
    if (bmargin >= 0)
	fprintf(stderr, "\tbmargin is set to %g\n", bmargin);
    else
	fputs("\tbmargin is computed automatically\n", stderr);
    if (rmargin >= 0)
	fprintf(stderr, "\trmargin is set to %g\n", rmargin);
    else
	fputs("\trmargin is computed automatically\n", stderr);
    if (tmargin >= 0)
	fprintf(stderr, "\ttmargin is set to %g\n", tmargin);
    else
	fputs("\ttmargin is computed automatically\n", stderr);
}


/* process 'show output' command */
static void
show_output()
{
    SHOW_ALL_NL;

    if (outstr)
	fprintf(stderr, "\toutput is sent to '%s'\n", outstr);
    else
	fputs("\toutput is sent to STDOUT\n", stderr);
}


/* process 'show print' command */
static void
show_print()
{
    SHOW_ALL_NL;

    fprintf(stderr, "\tprint output is sent to '%s'\n", print_show_output());
}


/* process 'show parametric' command */
static void
show_parametric()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tparametric is %s\n", (parametric) ? "ON" : "OFF");
}


static void
show_palette_rgbformulae()
{
    int i;
    fprintf(stderr,"\t  * there are %i available rgb color mapping formulae:",
	    sm_palette.colorFormulae);
    /* print the description of the color formulae */
    i = 0;
    while ( *(ps_math_color_formulae[2*i]) ) {
	if (i % 3 == 0)
	    fputs("\n\t    ", stderr);
	fprintf(stderr, "%2i: %-15s",i,ps_math_color_formulae[2*i+1]);
	i++;
    }
    fputs("\n", stderr);
    fputs("\t  * negative numbers mean inverted=negative colour component\n",
	    stderr);
    fprintf(stderr,
	    "\t  * thus the ranges in `set pm3d rgbformulae' are -%i..%i\n",
	    sm_palette.colorFormulae-1,sm_palette.colorFormulae-1);
    ++c_token;
}


static void
show_palette_fit2rgbformulae()
{
#define rgb_distance(r,g,b) ((r)*(r) + (g)*(g) + (b)*(b))
    int pts = 32; /* resolution: nb of points in the discrete raster for comparisons */
    int i, p, ir, ig, ib;
    int rMin=0, gMin=0, bMin=0;
    int maxFormula = sm_palette.colorFormulae - 1; /* max formula number */
    double gray, dist, distMin;
    rgb_color *currRGB;
    int *formulaeSeq;
    double **formulae;
    ++c_token;
    if (sm_palette.colorMode == SMPAL_COLOR_MODE_RGB && sm_palette.cmodel == C_MODEL_RGB) {
	fprintf(stderr, "\tCurrent palette is\n\t    set palette rgbformulae %i,%i,%i\n", sm_palette.formulaR, sm_palette.formulaG, sm_palette.formulaB);
	return;
    }
    /* allocate and fill R, G, B values rastered on pts points */
    currRGB = (rgb_color*)gp_alloc(pts * sizeof(rgb_color), "RGB pts");
    for (p = 0; p < pts; p++) {
	gray = (double)p / (pts - 1);
	rgb1_from_gray(gray, &(currRGB[p]));
    }
    /* organize sequence of rgb formulae */
    formulaeSeq = gp_alloc((2*maxFormula+1) * sizeof(int), "formulaeSeq");
    for (i = 0; i <= maxFormula; i++)
	formulaeSeq[i] = i;
    for (i = 1; i <= maxFormula; i++)
	formulaeSeq[maxFormula+i] = -i;
    /* allocate and fill all +-formulae on the interval of given number of points */
    formulae = gp_alloc((2*maxFormula+1) * sizeof(double*), "formulae");
    for (i = 0; i < 2*maxFormula+1; i++) {
	formulae[i] = gp_alloc(pts * sizeof(double), "formulae pts");
	for (p = 0; p < pts; p++) {
	    double gray = (double)p / (pts - 1);
	    formulae[i][p] = GetColorValueFromFormula(formulaeSeq[i], gray);
	}
    }
    /* Now go over all rastered formulae, compare them to the current one, and
       find the minimal distance.
     */
    distMin = VERYLARGE;
    for (ir = 0; ir <	 2*maxFormula+1; ir++) {
	for (ig = 0; ig < 2*maxFormula+1; ig++) {
	    for (ib = 0; ib < 2*maxFormula+1; ib++) {
		dist = 0; /* calculate distance of the two rgb profiles */
		for (p = 0; p < pts; p++) {
		double tmp = rgb_distance(
			    currRGB[p].r - formulae[ir][p],
			    currRGB[p].g - formulae[ig][p],
			    currRGB[p].b - formulae[ib][p] );
		    dist += tmp;
		}
		if (dist < distMin) {
		    distMin = dist;
		    rMin = formulaeSeq[ir];
		    gMin = formulaeSeq[ig];
		    bMin = formulaeSeq[ib];
		}
	    }
	}
    }
    fprintf(stderr, "\tThe best match of the current palette corresponds to\n\t    set palette rgbformulae %i,%i,%i\n", rMin, gMin, bMin);
#undef rgb_distance
    for (i = 0; i < 2*maxFormula+1; i++)
	free(formulae[i]);
    free(formulae);
    free(formulaeSeq);
    free(currRGB);
}


static void
show_palette_palette()
{
    int colors, i;
    struct value a;
    double gray;
    rgb_color rgb1;
    rgb255_color rgb255;
    int how = 0; /* How to print table: 0: default large; 1: rgb 0..1; 2: integers 0..255 */
    FILE *f;

    c_token++;
    if (END_OF_COMMAND)
	int_error(c_token,"palette size required");
    colors = (int) real(const_express(&a));
    if (colors<2) colors = 128;
    if (!END_OF_COMMAND) {
	if (almost_equals(c_token, "f$loat")) /* option: print r,g,b floats 0..1 values */
	    how = 1;
	else if (almost_equals(c_token, "i$nt")) /* option: print only integer 0..255 values */
	    how = 2;
    else
	    int_error(c_token, "expecting no option or int or float");
	c_token++;
    }

    i = (print_out==NULL || print_out==stderr || print_out==stdout);
    f = (print_out) ? print_out : stderr;
    fprintf(stderr, "%s palette with %i discrete colors",
	    (sm_palette.colorMode == SMPAL_COLOR_MODE_GRAY) ? "Gray" : "Color", colors);
    if (!i)
	fprintf(stderr," saved to \"%s\".", print_out_name);
    else
	fprintf(stderr, ".\n");

    for (i = 0; i < colors; i++) {
	/* colours equidistantly from [0,1]  */
	gray = (double)i / (colors - 1);
	if (sm_palette.positive == SMPAL_NEGATIVE)
	    gray = 1 - gray;
	rgb1_from_gray(gray, &rgb1);
	rgb255_from_rgb1(rgb1, &rgb255);

	switch (how) {
	    case 1:
		fprintf(f, "%0.4f\t%0.4f\t%0.4f\n", rgb1.r, rgb1.g, rgb1.b);
		break;
	    case 2:
		fprintf(f, "%i\t%i\t%i\n", (int)rgb255.r, (int)rgb255.g, (int)rgb255.b);
		break;
	    default:
		fprintf(f,
    		    "%3i. gray=%0.4f, (r,g,b)=(%0.4f,%0.4f,%0.4f), #%02x%02x%02x = %3i %3i %3i\n",
    		    i, gray, rgb1.r, rgb1.g, rgb1.b,
    		    (int)rgb255.r, (int)rgb255.g, (int)rgb255.b,
    		    (int)rgb255.r, (int)rgb255.g, (int)rgb255.b );
	}
    }
}


static void
show_palette_gradient()
{
    int i;
    double gray,r,g,b;

    ++c_token;
    if (sm_palette.colorMode != SMPAL_COLOR_MODE_GRADIENT) {
        fputs( "\tcolor mapping *not* done by defined gradient.\n", stderr );
	return;
    }

    for( i=0; i<sm_palette.gradient_num; ++i ) {
        gray = sm_palette.gradient[i].pos;
        r = sm_palette.gradient[i].col.r;
        g = sm_palette.gradient[i].col.g;
        b = sm_palette.gradient[i].col.b;
        fprintf(stderr,
 "%3i. gray=%0.4f, (r,g,b)=(%0.4f,%0.4f,%0.4f), #%02x%02x%02x = %3i %3i %3i\n",
		i, gray, r,g,b,
                (int)(255*r+.5),(int)(255*g+.5),(int)(255*b+.5),
                (int)(255*r+.5),(int)(255*g+.5),(int)(255*b+.5) );
	}
}


static void
show_palette_colornames()
{
    const struct gen_table *tbl = pm3d_color_names_tbl;
    int i=0;
    fputs( "\tList of known color names:", stderr );
    while (tbl->key) {
#if 0
	/* Print only color names, table with 4 columns */
	if (i%4 == 0) fputs( "\n  ", stderr );
	fprintf( stderr, "%-18s ", tbl->key );
#else
	/* Print color names and their rgb values, table with 1 column */
	int r = ((tbl->value >> 16 ) & 255);
	int g = ((tbl->value >> 8 ) & 255);
	int b = (tbl->value & 255);

	fprintf( stderr, "\n  %-18s ", tbl->key );
	fprintf(stderr, "#%02x%02x%02x = %3i %3i %3i", r,g,b, r,g,b);
#endif
	++tbl;
	++i;
    }
    fputs( "\n", stderr );
    ++c_token;
}


static void
show_palette()
{
    /* no option given, i.e. "show palette" */
    if (END_OF_COMMAND) {
	fprintf(stderr,"\tpalette is %s\n",
	    sm_palette.colorMode == SMPAL_COLOR_MODE_GRAY ? "GRAY" : "COLOR");

	switch( sm_palette.colorMode ) {
	  case SMPAL_COLOR_MODE_GRAY: break;
	  case SMPAL_COLOR_MODE_RGB:
	    fprintf(stderr,"\trgb color mapping by rgbformulae are %i,%i,%i\n",
		    sm_palette.formulaR, sm_palette.formulaG,
		    sm_palette.formulaB);
	    break;
	  case SMPAL_COLOR_MODE_GRADIENT:
	    fputs( "\tcolor mapping by defined gradient\n", stderr );
	    break;
	  case SMPAL_COLOR_MODE_FUNCTIONS:
	    fputs("\tcolor maping is done by user defined functions\n",stderr);
	    if (sm_palette.Afunc.at && sm_palette.Afunc.definition)
	        fprintf( stderr, "\t  A-formula: %s\n",
			 sm_palette.Afunc.definition);
	    if (sm_palette.Bfunc.at && sm_palette.Bfunc.definition)
	        fprintf( stderr, "\t  B-formula: %s\n",
			 sm_palette.Bfunc.definition);
	    if (sm_palette.Cfunc.at && sm_palette.Cfunc.definition)
	        fprintf( stderr, "\t  C-formula: %s\n",
			 sm_palette.Cfunc.definition);
	    break;
	  default:
	    fprintf( stderr, "%s:%d oops: Unknown color mode '%c'.\n",
		     __FILE__, __LINE__, (char)(sm_palette.colorMode) );
	}
	fprintf(stderr,"\tfigure is %s\n",
	    sm_palette.positive == SMPAL_POSITIVE ? "POSITIVE" : "NEGATIVE");
	fprintf( stderr,
           "\tall color formulae ARE%s written into output postscript file\n",
		 sm_palette.ps_allcF == 0 ? " NOT" : "");
	fputs("\tallocating ", stderr);
	if (sm_palette.use_maxcolors)
	    fprintf(stderr,"MAX %i",sm_palette.use_maxcolors);
	else
	    fputs("ALL remaining", stderr);
	fputs(" color positions for discrete palette terminals\n", stderr);
	fputs( "\tColor-Model: ", stderr );
	switch( sm_palette.cmodel ) {
	case C_MODEL_RGB: fputs( "RGB\n", stderr ); break;
	case C_MODEL_HSV: fputs( "HSV\n", stderr ); break;
	case C_MODEL_CMY: fputs( "CMY\n", stderr ); break;
	case C_MODEL_YIQ: fputs( "YIQ\n", stderr ); break;
	case C_MODEL_XYZ: fputs( "XYZ\n", stderr ); break;
	default:
	  fprintf( stderr, "%s:%d ooops: Unknown color mode '%c'.\n",
		   __FILE__, __LINE__, (char)(sm_palette.cmodel) );
	}
	fprintf(stderr,"\tgamma is %.4g\n", sm_palette.gamma );
	return;
    }

    if (almost_equals(c_token, "pal$ette")) {
        /* 'show palette palette <n>' */
        show_palette_palette();
	return;
    }
    else if (almost_equals(c_token, "gra$dient")) {
        /* 'show palette gradient' */
        show_palette_gradient();
	return;
    }
    else if (almost_equals(c_token, "rgbfor$mulae" )) {
        /* 'show palette rgbformulae' */
        show_palette_rgbformulae();
	return;
    }
    else if (almost_equals(c_token, "color$names" )) {
        /* 'show palette colornames' */
        show_palette_colornames();
	return;
    }
    else if (almost_equals(c_token, "fit2rgb$formulae" )) {
        /* 'show palette fit2rgbformulae' */
	show_palette_fit2rgbformulae();
	return;
    }
    else { /* wrong option to "show palette" */
        int_error( c_token, "Required 'show palette' or 'show palette gradient' or\n\t 'show palette palette <n>' or 'show palette rgbformulae' or\n\t 'show palette colornames'.");
    }
}


static void
show_colorbox()
{
    c_token++;
    if (color_box.border) {
	fputs("\tcolor box with border, ", stderr);
	if (color_box.border_lt_tag >= 0)
	    fprintf(stderr,"line type %d is ", color_box.border_lt_tag);
	else
	    fputs("DEFAULT line type is ", stderr);
    } else {
	fputs("\tcolor box without border is ", stderr);
    }
    switch (color_box.where) {
	case SMCOLOR_BOX_NO:
	    fputs("NOT drawn\n", stderr);
	    break;
	case SMCOLOR_BOX_DEFAULT:
	    fputs("drawn at DEFAULT position\n", stderr);
	    break;
	case SMCOLOR_BOX_USER:
	    fputs("drawn at USER position: ", stderr);
	    show_position(&color_box.origin);
	    fputs("\n\t          size: ", stderr);
	    show_position(&color_box.size);
	    fputs("\n", stderr);
	    break;
	default: /* should *never* happen */
	    int_error(NO_CARET, "Argh !");
    }
    fprintf(stderr,"\tcolor gradient is %s in the color box\n",
	color_box.rotation == 'v' ? "VERTICAL" : "HORIZONTAL");
}


static void
show_pm3d()
{
    c_token++;
    fprintf(stderr,"\tpm3d style is %s\n", PM3D_IMPLICIT == pm3d.implicit ? "implicit (pm3d draw for all surfaces)" : "explicit (draw pm3d surface according to style)");
    fputs("\tpm3d plotted at ", stderr);
    { int i=0;
	for ( ; pm3d.where[i]; i++ ) {
	    if (i>0) fputs(", then ", stderr);
	    switch (pm3d.where[i]) {
		case PM3D_AT_BASE: fputs("BOTTOM", stderr); break;
		case PM3D_AT_SURFACE: fputs("SURFACE", stderr); break;
		case PM3D_AT_TOP: fputs("TOP", stderr); break;
	    }
	}
	fputs("\n", stderr);
    }
    if (pm3d.direction == PM3D_DEPTH) {
	fprintf(stderr,"\ttrue depth ordering\n");
    } else if (pm3d.direction != PM3D_SCANS_AUTOMATIC) {
	fprintf(stderr,"\ttaking scans in %s direction\n",
	    pm3d.direction == PM3D_SCANS_FORWARD ? "FORWARD" : "BACKWARD");
    } else {
	fputs("\ttaking scans direction automatically\n", stderr);
    }
    fputs("\tsubsequent scans with different nb of pts are ", stderr);
    if (pm3d.flush == PM3D_FLUSH_CENTER) fputs("CENTERED\n", stderr);
    else fprintf(stderr,"flushed from %s\n",
	pm3d.flush == PM3D_FLUSH_BEGIN ? "BEGIN" : "END");
    fprintf(stderr,"\tflushing triangles are %sdrawn\n",
	pm3d.ftriangles ? "" : "not ");
    fputs("\tclipping: ", stderr);
    if (pm3d.clip == PM3D_CLIP_1IN)
	fputs("at least 1 point of the quadrangle in x,y ranges\n", stderr);
    else
	fputs( "all 4 points of the quadrangle in x,y ranges\n", stderr);
    if (pm3d.hidden3d_tag) {
	fprintf(stderr,"\tpm3d-hidden3d is on an will use linestyle %d\n",
	    pm3d.hidden3d_tag);
    } else {
	fputs("\tpm3d-hidden3d is off\n", stderr);
    }
#if PM3D_HAVE_SOLID
    if (pm3d.solid) {
	fputs("\tborders, tics and labels may be hidden by the surface\n", stderr);
    } else {
	fputs("\tsurface is transparent for borders, tics and labels\n", stderr);
    }
#endif
    fprintf(stderr,"\tsteps for bilinear interpolation: %d,%d\n",
	 pm3d.interp_i, pm3d.interp_j);
    fprintf(stderr,"\tquadrangle color according to ");
    switch (pm3d.which_corner_color) {
	case PM3D_WHICHCORNER_MEAN: fputs("averaged 4 corners\n", stderr); break;
	case PM3D_WHICHCORNER_GEOMEAN: fputs("geometrical mean of 4 corners\n", stderr); break;
	case PM3D_WHICHCORNER_MEDIAN: fputs("median of 4 corners\n", stderr); break;
	case PM3D_WHICHCORNER_MIN: fputs("minimum of 4 corners\n", stderr); break;
	case PM3D_WHICHCORNER_MAX: fputs("maximum of 4 corners\n", stderr); break;
	default: fprintf(stderr, "corner %i\n", pm3d.which_corner_color - PM3D_WHICHCORNER_C1 + 1);
    }
}


/* process 'show pointsize' command */
static void
show_pointsize()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tpointsize is %g\n", pointsize);
}


/* process 'show encoding' command */
static void
show_encoding()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tencoding is %s\n", encoding_names[encoding]);
}


/* process 'show decimalsign' command */
static void
show_decimalsign()
{
    SHOW_ALL_NL;
#ifdef HAVE_LOCALE_H
    if (save_locale) {
	setlocale(LC_NUMERIC,save_locale);
	fprintf(stderr, "\tdecimalsign for input is  %s \n", localeconv()->decimal_point);
    }
#endif
    if (decimalsign!=NULL)
        fprintf(stderr, "\tdecimalsign for output is %s \n", decimalsign);
    else
        fprintf(stderr, "\tdecimalsign for output has default value (normally '.')\n");
}


/* process 'show fit' command */
static void
show_fit()
{
    SHOW_ALL_NL;

#ifdef GP_FIT_ERRVARS
    fprintf(stderr, "\
\tfit will%s place parameter errors in variables\n",
	    fit_errorvariables ? "" : " not");
#endif /* GP_FIT_ERRVARS */

    if (fitlogfile != NULL) {
        fprintf(stderr, "\
\tlog-file for fits is was set by the user to be \n\
\t'%s'\n", fitlogfile);
    } else {
	char *logfile = getfitlogfile();

	if (logfile) {
	    fprintf(stderr, "\
\tlog-file for fits is unchanged from the environment default of\n\
\t'%s'\n", logfile);
	    free(logfile);
	}
    }
}


/* process 'show polar' command */
static void
show_polar()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tpolar is %s\n", (polar) ? "ON" : "OFF");
}


/* process 'show angles' command */
static void
show_angles()
{
    SHOW_ALL_NL;

    fputs("\tAngles are in ", stderr);
    if (ang2rad == 1) {
	fputs("radians\n", stderr);
    } else {
	fputs("degrees\n", stderr);
    }
}


/* process 'show samples' command */
static void
show_samples()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tsampling rate is %d, %d\n", samples_1, samples_2);
}


/* process 'show isosamples' command */
static void
show_isosamples()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tiso sampling rate is %d, %d\n",
	    iso_samples_1, iso_samples_2);
}


/* process 'show view' command */
static void
show_view()
{
    SHOW_ALL_NL;
    fputs("\tview is ", stderr);
    if (splot_map == TRUE) {
	fputs("map\n", stderr);
	return;
    }
    fprintf(stderr, "%g rot_x, %g rot_z, %g scale, %g scale_z\n",
		surface_rot_x, surface_rot_z, surface_scale, surface_zscale);
}


/* process 'show surface' command */
static void
show_surface()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tsurface is %sdrawn\n", draw_surface ? "" : "not ");
}


/* process 'show hidden3d' command */
static void
show_hidden3d()
{
    SHOW_ALL_NL;

#ifdef LITE
    printf(" Hidden Line Removal Not Supported in LITE version\n");
#else
    fprintf(stderr, "\thidden surface is %s\n",
	    hidden3d ? "removed" : "drawn");
    show_hidden3doptions();
#endif /* LITE */
}

static void
show_increment()
{
    fprintf(stderr,"\tPlot lines increment over ");
    if (prefer_line_styles)
	fprintf(stderr, "user-defined line styles rather than default line types\n");
    else
	fprintf(stderr, "default linetypes\n");
}

#ifdef EAM_HISTOGRAMS
static void
show_histogram()
{
    if (histogram_opts.type == HT_CLUSTERED)
	fprintf(stderr, "\tHistogram style is clustered with gap %d ", 
		histogram_opts.gap);
    else if (histogram_opts.type == HT_ERRORBARS)
	fprintf(stderr, "\tHistogram style is errorbars with gap %d lw %g ",
		histogram_opts.gap, histogram_opts.bar_lw);
    else if (histogram_opts.type == HT_STACKED_IN_LAYERS)
	fprintf(stderr, "\tHistogram style is rowstacked ");
    else if (histogram_opts.type == HT_STACKED_IN_TOWERS)
	fprintf(stderr, "\tHistogram style is columnstacked ");
    fprintf(stderr, " title offset ");
    show_position(&histogram_opts.title.offset);
    if (histogram_opts.title.textcolor.type == TC_LT)
	fprintf(stderr," textcolor lt %d", histogram_opts.title.textcolor.lt+1); 
    fprintf(stderr, "\n");
}
#endif

#ifdef GNUPLOT_HISTORY
/* process 'show historysize' command */
static void
show_historysize()
{
    if (gnuplot_history_size >= 0) {
	fprintf(stderr, "\thistory size: %ld\n", gnuplot_history_size);
    } else {
	fprintf(stderr, "\thistory will not be truncated.\n");
    }
}
#endif


/* process 'show size' command */
static void
show_size()
{
    SHOW_ALL_NL;

    fprintf(stderr, "\tsize is scaled by %g,%g\n", xsize, ysize);
    if (aspect_ratio > 0)
	fprintf(stderr, "\tTry to set aspect ratio to %g:1.0\n", aspect_ratio);
    else if (aspect_ratio == 0)
	fputs("\tNo attempt to control aspect ratio\n", stderr);
    else
	fprintf(stderr, "\tTry to set LOCKED aspect ratio to %g:1.0\n",
		-aspect_ratio);
}


/* process 'show origin' command */
static void
show_origin()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\torigin is set to %g,%g\n", xoffset, yoffset);
}


/* process 'show term' command */
static void
show_term()
{
    SHOW_ALL_NL;

    if (term)
	fprintf(stderr, "   terminal type is %s %s\n",
		term->name, term_options);
    else
	fputs("\tterminal type is unknown\n", stderr);
}


/* process 'show tics|[xyzx2y2cb]tics' commands */
static void
show_tics(
    TBOOLEAN showx, TBOOLEAN showy, TBOOLEAN showz,
    TBOOLEAN showx2, TBOOLEAN showy2,
    TBOOLEAN showcb)
{
    SHOW_ALL_NL;

    if (xyplane.absolute)
	fprintf(stderr, "xyplane intercepts z axis at %g\n", xyplane.xyplane_z);
    else
	fprintf(stderr, "xyplane ticslevel is %g\n", xyplane.ticslevel);

    if (showx)
	show_ticdef(FIRST_X_AXIS);
    if (showx2)
	show_ticdef(SECOND_X_AXIS);
    if (showy)
	show_ticdef(FIRST_Y_AXIS);
    if (showy2)
	show_ticdef(SECOND_Y_AXIS);
    if (showz)
	show_ticdef(FIRST_Z_AXIS);
    if (showcb)
	show_ticdef(COLOR_AXIS);
    screen_ok = FALSE;
}


/* process 'show m[xyzx2y2cb]tics' commands */
static void
show_mtics(AXIS_INDEX axis)
{
    switch (axis_array[axis].minitics) {
    case MINI_OFF:
	fprintf(stderr, "\tminor %stics are off\n", axis_defaults[axis].name);
	break;
    case MINI_DEFAULT:
	fprintf(stderr, "\
\tminor %stics are off for linear scales\n\
\tminor %stics are computed automatically for log scales\n", axis_defaults[axis].name, axis_defaults[axis].name);
	break;
    case MINI_AUTO:
	fprintf(stderr, "\tminor %stics are computed automatically\n", axis_defaults[axis].name);
	break;
    case MINI_USER:
	fprintf(stderr, "\
\tminor %stics are drawn with %d subintervals between major xtic marks\n",
		axis_defaults[axis].name, (int) axis_array[axis].mtic_freq);
	break;
    default:
	int_error(NO_CARET, "Unknown minitic type in show_mtics()");
    }
}


/* process 'show timestamp' command */
static void
show_timestamp()
{
    SHOW_ALL_NL;
    show_xyzlabel("", "time", &timelabel);
    fprintf(stderr, "\twritten in %s corner\n",
	    (timelabel_bottom ? "bottom" : "top"));
    if (timelabel_rotate)
	fputs("\trotated if the terminal allows it\n\t", stderr);
    else
	fputs("\tnot rotated\n\t", stderr);
}


/* process 'show [xyzx2y2rtuv]range' commands */
static void
show_range(AXIS_INDEX axis)
{
    SHOW_ALL_NL;
    if (axis_array[axis].is_timedata)
	fprintf(stderr, "\tset %sdata time\n", axis_defaults[axis].name);
    fprintf(stderr,"\t");
    save_range(stderr, axis);
}


/* called by the functions below */
static void
show_xyzlabel(const char *name, const char *suffix, text_label *label)
{
    if (label) {
	fprintf(stderr, "\t%s%s is \"%s\", offset at ", name, suffix,
	    label->text ? conv_text(label->text) : "");
	show_position(&label->offset);
    } else
	return;

    if (label->font)
	fprintf(stderr, ", using font \"%s\"", conv_text(label->font));

    if (label->rotate)
	fprintf(stderr, ", rotated by %d degrees", label->rotate);

    if (label->textcolor.type)
	save_textcolor(stderr, &label->textcolor);

    if (label->noenhanced)
	fprintf(stderr," noenhanced");

    putc('\n', stderr);
}


/* process 'show title' command */
static void
show_title()
{
    SHOW_ALL_NL;
    show_xyzlabel("","title", &title);
}


/* process 'show {x|y|z|x2|y2}label' command */
static void
show_axislabel(AXIS_INDEX axis)
{
    SHOW_ALL_NL;
    show_xyzlabel(axis_defaults[axis].name, "label", &axis_array[axis].label);
}


/* process 'show [xyzx2y2]data' commands */
static void
show_data_is_timedate(AXIS_INDEX axis)
{
    SHOW_ALL_NL;
    fprintf(stderr, "\t%s is set to %s\n", axis_defaults[axis].name,
	    axis_array[axis].is_timedata ? "time" : "numerical");
}


/* process 'show timefmt' command */
static void
show_timefmt()
{
    int axis;

    SHOW_ALL_NL;

    if ((axis = lookup_table(axisname_tbl, c_token)) >= 0) {
	c_token++;
	fprintf(stderr, "\tread format for time on %s axis is \"%s\"\n",
		axis_defaults[axis].name,
		conv_text(axis_array[axis].timefmt));
    } else {
        /* show all currently active time axes' formats: */
	for (axis = 0; axis<AXIS_ARRAY_SIZE; axis++)
	    if (axis_array[axis].is_timedata)
		fprintf(stderr,
			"\tread format for time on %s axis is \"%s\"\n",
			axis_defaults[axis].name,
			conv_text(axis_array[axis].timefmt));
    }
}


/* process 'show locale' command */
static void
show_locale()
{
    SHOW_ALL_NL;
    locale_handler(ACTION_SHOW,NULL);
#ifdef HAVE_LOCALE_H
    /* We reset LC_NUMERIC locale explicitly to C, so we must undo it here */
    fprintf(stderr, "\tLC_NUMERIC is %s\n", setlocale(LC_NUMERIC,save_locale));
#endif
}


/* process 'show loadpath' command */
static void
show_loadpath()
{
    SHOW_ALL_NL;
    loadpath_handler(ACTION_SHOW,NULL);
}


/* process 'show fontpath' command */
static void
show_fontpath()
{
    SHOW_ALL_NL;
    fontpath_handler(ACTION_SHOW,NULL);
}


/* process 'show zero' command */
static void
show_zero()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tzero is %g\n", zero);
}


/* process 'show datafile' command */
static void
show_datafile()
{
    SHOW_ALL_NL;

    if (END_OF_COMMAND || almost_equals(c_token,"miss$ing")) {
	if (missing_val == NULL)
	    fputs("\tNo missing data string set for datafile\n", stderr);
	else
	    fprintf(stderr, "\t\"%s\" in datafile is interpreted as missing value\n",
		missing_val);
    }
    if (END_OF_COMMAND || almost_equals(c_token,"sep$arator")) {
	if (df_separator != '\0')
	    fprintf(stderr, "\tdatafile fields separated by \"%c\"\n", df_separator);
	else
	    fprintf(stderr, "\tdatafile fields separated by whitespace\n");
    }
    if (END_OF_COMMAND || almost_equals(c_token,"com$ments")) {
	fprintf(stderr, "\tComments chars are \"%s\"\n", df_commentschars);
    }
    if (df_fortran_constants)
	fputs("\tdatafile parsing will accept Fortran D or Q constants\n",stderr);
#if BINARY_DATA_FILE
    if (END_OF_COMMAND || almost_equals(c_token,"bin$ary")) {
	if (!END_OF_COMMAND)
	    c_token++;
	if (END_OF_COMMAND) {
	    /* 'show datafile binary' */
	    df_show_binary(stderr);
	    fputc('\n',stderr);
	}
	if (END_OF_COMMAND || almost_equals(c_token, "datas$izes"))
	    /* 'show datafile binary datasizes' */
	    df_show_datasizes(stderr);
	if (END_OF_COMMAND)
	    fputc('\n',stderr);
	if (END_OF_COMMAND || almost_equals(c_token, "filet$ypes"))
	    /* 'show datafile binary filetypes' */
	    df_show_filetypes(stderr);
    }
#endif
    if (!END_OF_COMMAND)
	c_token++;
}

#ifdef USE_MOUSE
/* process 'show mouse' command */
static void
show_mouse()
{
    SHOW_ALL_NL;
    if (mouse_setting.on) {
	fprintf(stderr, "\tmouse is on\n");
	if (mouse_setting.annotate_zoom_box) {
	    fprintf(stderr, "\tzoom coordinates will be drawn\n");
	} else {
	    fprintf(stderr, "\tno zoom coordinates will be drawn\n");
	}
	if (mouse_setting.polardistance) {
	    fprintf(stderr, "\tdistance to ruler will be show in polar coordinates\n");
	} else {
	    fprintf(stderr, "\tno polar distance to ruler will be shown\n");
	}
	if (mouse_setting.doubleclick > 0) {
	    fprintf(stderr, "\tdouble click resolution is %d ms\n",
		mouse_setting.doubleclick);
	} else {
	    fprintf(stderr, "\tdouble click resolution is off\n");
	}
	fprintf(stderr, "\tformatting numbers with \"%s\"\n",
	    mouse_setting.fmt);
	fprintf(stderr, "\tformat for Button 1 is %d\n", (int) clipboard_mode);
	if (clipboard_alt_string) {
	    fprintf(stderr, "\talternative format for Button 1 is '%s'\n",
		clipboard_alt_string);
	}
	fprintf(stderr, "\tformat for Button 2 is %d\n", (int) mouse_mode);
	if (mouse_alt_string) {
	    fprintf(stderr, "\talternative format for Button 2 is '%s'\n",
		mouse_alt_string);
	}
	if (mouse_setting.label) {
	    fprintf(stderr, "\tButton 2 draws labes with options \"%s\"\n",
		mouse_setting.labelopts);
	} else {
	    fprintf(stderr, "\tdrawing temporary annotation on Button 2\n");
	}
	fprintf(stderr, "\tzoomjump is %s\n",
	    mouse_setting.warp_pointer ? "on" : "off");
	fprintf(stderr, "\tcommunication commands will %sbe shown\n",
	    mouse_setting.verbose ? "" : "not ");
    } else {
	fprintf(stderr, "\tmouse is off\n");
    }
}
#endif

/* process 'show plot' command */
static void
show_plot()
{
    SHOW_ALL_NL;
    fprintf(stderr, "\tlast plot command was: %s\n", replot_line);
}


/* process 'show variables' command */
static void
show_variables()
{
    struct udvt_entry *udv = first_udv;
    int len;
    int show_gpval = 0;

    SHOW_ALL_NL;

    if (!END_OF_COMMAND) {
	if (almost_equals(c_token, "all"))
	    show_gpval = 1;
	else 
	    int_error(c_token, "Required no option or 'all'");
	c_token++;
    }

    if (show_gpval)
	fputs("\n\tAll available variables:\n", stderr);
    else
	fputs("\n\tUser and default variables:\n", stderr);

    while (udv) {
	len = strcspn(udv->udv_name, " ");
	if (!show_gpval && !strncmp(udv->udv_name,"GPVAL_",6)) { /* skip GPVAL_ variables */
	    udv = udv->next_udv;
	    continue;
	}
	if (udv->udv_undef) {
	    FPRINTF((stderr, "\t%-*s is undefined\n", len, udv->udv_name));
	} else {
	    fprintf(stderr, "\t%-*s ", len, udv->udv_name);
	    fputs("= ", stderr);
	    disp_value(stderr, &(udv->udv_value), TRUE);
	    (void) putc('\n', stderr);
	}
	udv = udv->next_udv;
    }
}


/* Show line style number <tag> (0 means show all) */
static void
show_linestyle(int tag)
{
    struct linestyle_def *this_linestyle;
    TBOOLEAN showed = FALSE;

    for (this_linestyle = first_linestyle; this_linestyle != NULL;
	 this_linestyle = this_linestyle->next) {
	if (tag == 0 || tag == this_linestyle->tag) {
	    showed = TRUE;
	    fprintf(stderr, "\tlinestyle %d, ", this_linestyle->tag);
	    save_linetype(stderr, &(this_linestyle->lp_properties), TRUE);
	    fputc('\n', stderr);
	}
    }
    if (tag > 0 && !showed)
	int_error(c_token, "linestyle not found");
}


/* Show arrow style number <tag> (0 means show all) */
static void
show_arrowstyle(int tag)
{
    struct arrowstyle_def *this_arrowstyle;
    TBOOLEAN showed = FALSE;

    for (this_arrowstyle = first_arrowstyle; this_arrowstyle != NULL;
	 this_arrowstyle = this_arrowstyle->next) {
	if (tag == 0 || tag == this_arrowstyle->tag) {
	    showed = TRUE;
	    fprintf(stderr, "\tarrowstyle %d, ", this_arrowstyle->tag);
	    fflush(stderr);

	    fprintf(stderr, "\t %s %s",
		    this_arrowstyle->arrow_properties.head ?
		    (this_arrowstyle->arrow_properties.head==2 ?
		     " both heads " : " one head ") : " nohead",
		    this_arrowstyle->arrow_properties.layer ? "front" : "back");
	    save_linetype(stderr, &(this_arrowstyle->arrow_properties.lp_properties), FALSE);
	    fputc('\n', stderr);

	    if (this_arrowstyle->arrow_properties.head > 0) {
		fprintf(stderr, "\t  arrow heads: %s, ",
		  ( (this_arrowstyle->arrow_properties.head_filled==2) ? "filled" :
		    ( (this_arrowstyle->arrow_properties.head_filled==1) ? "empty" :
		      "nofilled" )));
		if (this_arrowstyle->arrow_properties.head_length > 0) {
		    static char *msg[] =
			{"(first x axis) ", "(second x axis) ",
			 "(graph units) ", "(screen units) ",
			 "(character units) "};
		    fprintf(stderr," length %s%g, angle %g deg",
			    this_arrowstyle->arrow_properties.head_lengthunit == first_axes ? "" : msg[this_arrowstyle->arrow_properties.head_lengthunit],
			    this_arrowstyle->arrow_properties.head_length,
			    this_arrowstyle->arrow_properties.head_angle);
		    if (this_arrowstyle->arrow_properties.head_filled!=0)
			fprintf(stderr,", backangle %g deg",
				this_arrowstyle->arrow_properties.head_backangle);
		    fprintf(stderr,"\n");
		}
		else
		    fprintf(stderr," (default length and angles)\n");
	    }
	}
    }
    if (tag > 0 && !showed)
	int_error(c_token, "arrowstyle not found");
}


/* called by show_tics */
static void
show_ticdef(AXIS_INDEX axis)
{
    struct ticmark *t;

    const char *ticfmt = conv_text(axis_array[axis].formatstring);

    fprintf(stderr, "\t%s-axis tics are %s, \
\tmajor ticscale is %g and minor ticscale is %g\n",
	    axis_defaults[axis].name,
	    (axis_array[axis].tic_in ? "IN" : "OUT"),
	    axis_array[axis].ticscale, axis_array[axis].miniticscale);

    fprintf(stderr, "\t%s-axis tics:\t", axis_defaults[axis].name);
    switch (axis_array[axis].ticmode & TICS_MASK) {
    case NO_TICS:
	fputs("OFF\n", stderr);
	return;
    case TICS_ON_AXIS:
	fputs("on axis", stderr);
	if (axis_array[axis].ticmode & TICS_MIRROR)
	    fprintf(stderr, " and mirrored %s", (axis_array[axis].tic_in ? "OUT" : "IN"));
	break;
    case TICS_ON_BORDER:
	fputs("on border", stderr);
	if (axis_array[axis].ticmode & TICS_MIRROR)
	    fputs(" and mirrored on opposite border", stderr);
	break;
    }

    fprintf(stderr, "\n\t  labels are format \"%s\"", ticfmt);
    if (axis_array[axis].tic_rotate) {
	fprintf(stderr," rotated");
	fprintf(stderr," by %d",axis_array[axis].tic_rotate);
	fputs(" in 2D mode, terminal permitting,\n\t", stderr);
    } else
	fputs(" and are not rotated,\n\t", stderr);
    fputs("    offset ",stderr);
    show_position(&axis_array[axis].ticdef.offset);
    fputs("\n\t",stderr);

    switch (axis_array[axis].ticdef.type) {
    case TIC_COMPUTED:{
	    fputs("  intervals computed automatically\n", stderr);
	    break;
	}
    case TIC_MONTH:{
	    fputs("  Months computed automatically\n", stderr);
	    break;
	}
    case TIC_DAY:{
	    fputs("  Days computed automatically\n", stderr);
	    break;
	}
    case TIC_SERIES:{
	    fputs("  series", stderr);
	    if (axis_array[axis].ticdef.def.series.start != -VERYLARGE) {
		fputs(" from ", stderr);
		SHOW_NUM_OR_TIME(axis_array[axis].ticdef.def.series.start, axis);
	    }
	    fprintf(stderr, " by %g%s", axis_array[axis].ticdef.def.series.incr,
		    axis_array[axis].is_timedata ? " secs" : "");
	    if (axis_array[axis].ticdef.def.series.end != VERYLARGE) {
		fputs(" until ", stderr);
		SHOW_NUM_OR_TIME(axis_array[axis].ticdef.def.series.end, axis);
	    }
	    putc('\n', stderr);
	    break;
	}
    case TIC_USER:{
	    fputs("  no auto-generated tics\n", stderr);
	    break;
	}
    default:{
	    int_error(NO_CARET, "unknown ticdef type in show_ticdef()");
	    /* NOTREACHED */
	}
    }

    if (axis_array[axis].ticdef.def.user) {
	fputs("\t  explicit list (", stderr);
	for (t = axis_array[axis].ticdef.def.user; t != NULL; t = t->next) {
	    if (t->label)
		fprintf(stderr, "\"%s\" ", conv_text(t->label));
	    SHOW_NUM_OR_TIME(t->position, axis);
	    if (t->level)
		fprintf(stderr," %d",t->level);
	    if (t->next)
		fputs(", ", stderr);
	}
	fputs(")\n", stderr);
    }

    if (axis_array[axis].ticdef.textcolor.type != TC_DEFAULT) {
        fputs("\t ", stderr);
	save_textcolor(stderr, &axis_array[axis].ticdef.textcolor);
        fputs("\n", stderr);
    }

    if (axis_array[axis].ticdef.font && *axis_array[axis].ticdef.font) {
        fprintf(stderr,"\t  font \"%s\"\n", axis_array[axis].ticdef.font);
    }
}

/* Display a value in human-readable form. */
void
disp_value(FILE *fp, struct value *val, TBOOLEAN need_quotes)
{
    switch (val->type) {
    case INTGR:
	fprintf(fp, "%d", val->v.int_val);
	break;
    case CMPLX:
#ifdef HAVE_ISNAN
	if (isnan(val->v.cmplx_val.real))
	    fprintf(fp, "NaN");
	else
#endif
	if (val->v.cmplx_val.imag != 0.0)
	    fprintf(fp, "{%s, %s}",
		    num_to_str(val->v.cmplx_val.real),
		    num_to_str(val->v.cmplx_val.imag));
	else
	    fprintf(fp, "%s",
		    num_to_str(val->v.cmplx_val.real));
	break;
#ifdef GP_STRING_VARS
    case STRING:
    	if (val->v.string_val) {
	    if (need_quotes)
		fprintf(fp, "\"%s\"", conv_text(val->v.string_val));
	    else
		fprintf(fp, "%s", val->v.string_val);
	}
	break;
#endif
    default:
	int_error(NO_CARET, "unknown type in disp_value()");
    }
}

/* Helper for disp_value(): display a single number in decimal
 * format. Rotates through 4 buffers 's[j]', and returns pointers to
 * them, to avoid execution ordering problems if this function is
 * called more than once between sequence points. */
static char *
num_to_str(double r)
{
    static int i = 0;
    static char s[4][25];
    int j = i++;

    if (i > 3)
	i = 0;

    sprintf(s[j], "%.15g", r);
    if (strchr(s[j], '.') == NULL &&
#ifdef HAVE_LOCALE_H
	strchr(s[j], ',') == NULL &&
#endif
	strchr(s[j], 'e') == NULL &&
	strchr(s[j], 'E') == NULL)
	strcat(s[j], ".0");

    return s[j];
}


/* convert unprintable characters as \okt, tab as \t, newline \n .. */
char *
conv_text(const char *t)
{
    static char *r = NULL, *s;

    if (t==NULL) return NULL;

    /* is this enough? */
    r = gp_realloc(r, 4 * (strlen(t) + 1), "conv_text buffer");

    s = r;

    while (*t != NUL) {
	switch (*t) {
	case '\t':
	    *s++ = '\\';
	    *s++ = 't';
	    break;
	case '\n':
	    *s++ = '\\';
	    *s++ = 'n';
	    break;
#ifndef OSK
	case '\r':
	    *s++ = '\\';
	    *s++ = 'r';
	    break;
#endif
	case '"':
	case '\\':
	    *s++ = '\\';
	    *s++ = *t;
	    break;

	default:{
		if (isprint((unsigned char)*t))
		    *s++ = *t;
		else {
		    *s++ = '\\';
		    sprintf(s, "%03o", (unsigned char)*t);
		    while (*s != NUL)
			s++;
		}
	    }
	    break;
	}
	t++;
    }
    *s = NUL;
    return r;
}