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term.c
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term.c
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#ifndef lint
static char *RCSid = "$Id: term.c,v 1.19 1998/12/09 15:25:32 lhecking 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 "plot.h"
#include "bitmap.h"
#include "setshow.h"
#include "driver.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 */
/* true if terminal has been initialized */
static TBOOLEAN term_initialised;
/* true if terminal is in graphics mode */
static TBOOLEAN term_graphics = FALSE;
/* we have suspended the driver, in multiplot mode */
static TBOOLEAN term_suspended = FALSE;
/* true if? */
static TBOOLEAN opened_binary = FALSE;
/* true if require terminal to be initialized */
static TBOOLEAN term_force_init = FALSE;
extern FILE *gpoutfile;
extern char *outstr;
extern float xsize, ysize;
/* internal pointsize for do_point */
static double term_pointsize;
static void term_suspend __PROTO((void));
static void term_close_output __PROTO((void));
static void null_linewidth __PROTO((double));
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));
#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. */
#if defined(UNIXPLOT) || defined(GNUGRAPH)
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
#ifndef DEFAULTTERM
# define DEFAULTTERM NULL
#endif
/* 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((stderr, "term_close_output\n"));
opened_binary = FALSE;
if (!outstr) /* ie using stdout */
return;
#if defined(PIPES)
if (pipe_open) {
(void) pclose(gpoutfile);
pipe_open = FALSE;
} else
#endif /* PIPES */
#ifdef _Windows
if (stricmp(outstr, "PRN") == 0)
close_printer(gpoutfile);
else
#endif
(void) fclose(gpoutfile);
gpoutfile = stdout; /* Don't dup... */
free(outstr);
outstr = NULL;
}
#ifdef OS2
# define POPEN_MODE ("wb")
#else
# define POPEN_MODE ("w")
#endif
/* 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((stderr, "term_set_output\n"));
assert(dest == NULL || dest != outstr);
if (multiplot) {
fputs("In multiplotmode you can't change the output\n", stderr);
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 == '|') {
if ((f = popen(dest + 1, POPEN_MODE)) == (FILE *) NULL)
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(gpoutfile); /* close printer immediately if open */
gpoutfile = 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();
gpoutfile = f;
outstr = dest;
opened_binary = (term && (term->flags & TERM_BINARY));
UP_redirect(1);
}
}
void term_init()
{
FPRINTF((stderr, "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((stderr, "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
fputs("Cannot reopen output file in binary", stderr);
/* 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((stderr, "- calling term->init()\n"));
(*term->init) ();
term_initialised = TRUE;
}
}
void term_start_plot()
{
FPRINTF((stderr, "term_start_plot()\n"));
if (!term_initialised)
term_init();
if (!term_graphics) {
FPRINTF((stderr, "- calling term->graphics()\n"));
(*term->graphics) ();
term_graphics = TRUE;
} else if (multiplot && term_suspended) {
if (term->resume) {
FPRINTF((stderr, "- calling term->resume()\n"));
(*term->resume) ();
}
term_suspended = FALSE;
}
}
void term_end_plot()
{
FPRINTF((stderr, "term_end_plot()\n"));
if (!term_initialised)
return;
if (!multiplot) {
FPRINTF((stderr, "- calling term->text()\n"));
(*term->text) ();
term_graphics = FALSE;
}
#ifdef VMS
if (opened_binary)
fflush_binary();
else
#endif /* VMS */
(void) fflush(gpoutfile);
}
void term_start_multiplot()
{
FPRINTF((stderr, "term_start_multiplot()\n"));
if (multiplot)
term_end_multiplot();
multiplot = TRUE;
term_start_plot();
}
void term_end_multiplot()
{
FPRINTF((stderr, "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((stderr, "term_suspend()\n"));
if (term_initialised && !term_suspended && term->suspend) {
FPRINTF((stderr, "- calling term->suspend()\n"));
(*term->suspend) ();
term_suspended = TRUE;
}
}
void term_reset()
{
FPRINTF((stderr, "term_reset()\n"));
if (!term_initialised)
return;
if (term_suspended) {
if (term->resume) {
FPRINTF((stderr, "- 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(f_interactive)
TBOOLEAN f_interactive;
{
FPRINTF((stderr, "term_multiplot_okay(%d)\n", f_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 (!f_interactive || (term->flags & TERM_CAN_MULTIPLOT) ||
((gpoutfile != 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;
/* should be in term_tbl[] in later version */
htic = (term_pointsize * t->h_tic / 2);
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 */
/* (dx,dy) : vector from end to start */
double dx = (double) sx - (double) ex;
double dy = (double) sy - (double) ey;
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);
/* no head for arrows whih length = 0
* or, to be more specific, length < DBL_EPSILON,
* because len_arrow will almost always be != 0
*/
if (head && fabs(len_arrow) >= DBL_EPSILON) {
/* 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;
char line_buffer[BUFSIZ];
StartOutput();
sprintf(line_buffer,"\nAvailable terminal types:\n");
OutLine(line_buffer);
for (i = 0; i < TERMCOUNT; i++) {
sprintf(line_buffer," %15s %s\n",
term_tbl[i].name, term_tbl[i].description);
OutLine(line_buffer);
}
EndOutput();
}
/* set_term: get terminal number from name on command line
* will change 'term' variable if successful
*/
struct termentry *
set_term(c_token_arg)
int c_token_arg;
{
register struct termentry *t = NULL;
char *input_name;
if (!token[c_token_arg].is_token)
int_error("terminal name expected", c_token_arg);
input_name = input_line + token[c_token_arg].start_index;
t = change_term(input_name, token[c_token_arg].length);
if (!t)
int_error("unknown or ambiguous terminal type; type just 'set terminal' for a list",
c_token_arg);
/* 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)
fputs("Warning : scale interface is not null_scale - may not work with multiplot\n", stderr);
/* 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()
{
char *term_name = DEFAULTTERM;
#if (defined(__TURBOC__) && defined(MSDOS) && !defined(_Windows)) || defined(NEXT) || defined(SUN) || defined(X11)
char *env_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
env_term = getenv("TERM");
if (term_name == (char *) NULL
&& env_term != (char *) NULL && strcmp(term, "next") == 0)
term_name = "next";
#endif /* NeXT */
#ifdef SUN
env_term = getenv("TERM"); /* try $TERM */
if (term_name == (char *) NULL
&& env_term != (char *) NULL && strcmp(env_term, "sun") == 0)
term_name = "sun";
#endif /* SUN */
#ifdef _Windows
term_name = "win";
#endif /* _Windows */
#ifdef GPR
/* find out whether stdout is a DM pad. See term/gpr.trm */
if (gpr_isa_pad())
term_name = "gpr";
#else
# ifdef APOLLO
/* find out whether stdout is a DM pad. See term/apollo.trm */
if (apollo_isa_pad())
term_name = "apollo";
# endif /* APOLLO */
#endif /* GPR */
#ifdef X11
env_term = getenv("TERM"); /* try $TERM */
if (term_name == (char *) NULL
&& env_term != (char *) NULL && strcmp(env_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";