ncurses/base/lib_set_term.c

/****************************************************************************
 * Copyright (c) 1998,1999,2000 Free Software Foundation, Inc.              *
 *                                                                          *
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 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
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 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
**	lib_set_term.c
**
**	The routine set_term().
**
*/

#include <curses.priv.h>

#include <term.h>		/* cur_term */
#include <tic.h>

MODULE_ID("$Id: lib_set_term.c,v 1.61 2000/12/10 02:43:27 tom Exp $")

NCURSES_EXPORT(SCREEN *)
set_term(SCREEN * screenp)
{
    SCREEN *oldSP;

    T((T_CALLED("set_term(%p)"), screenp));

    oldSP = SP;
    _nc_set_screen(screenp);

    set_curterm(SP->_term);
    curscr = SP->_curscr;
    newscr = SP->_newscr;
    stdscr = SP->_stdscr;
    COLORS = SP->_color_count;
    COLOR_PAIRS = SP->_pair_count;
    memcpy(acs_map, SP->_acs_map, sizeof(chtype) * ACS_LEN);

    T((T_RETURN("%p"), oldSP));
    return (oldSP);
}

static void
_nc_free_keytry(struct tries *kt)
{
    if (kt != 0) {
	_nc_free_keytry(kt->child);
	_nc_free_keytry(kt->sibling);
	free(kt);
    }
}

/*
 * Free the storage associated with the given SCREEN sp.
 */
NCURSES_EXPORT(void)
delscreen(SCREEN * sp)
{
    SCREEN **scan = &_nc_screen_chain;

    T((T_CALLED("delscreen(%p)"), sp));

    while (*scan) {
	if (*scan == sp) {
	    *scan = sp->_next_screen;
	    break;
	}
	scan = &(*scan)->_next_screen;
    }

    (void) _nc_freewin(sp->_curscr);
    (void) _nc_freewin(sp->_newscr);
    (void) _nc_freewin(sp->_stdscr);
    _nc_free_keytry(sp->_keytry);
    _nc_free_keytry(sp->_key_ok);

    FreeIfNeeded(sp->_color_table);
    FreeIfNeeded(sp->_color_pairs);

    FreeIfNeeded(sp->oldhash);
    FreeIfNeeded(sp->newhash);

    del_curterm(sp->_term);

    /*
     * If the associated output stream has been closed, we can discard the
     * set-buffer.  Limit the error check to EBADF, since fflush may fail
     * for other reasons than trying to operate upon a closed stream.
     */
    if (sp->_ofp != 0
	&& sp->_setbuf != 0
	&& fflush(sp->_ofp) != 0
	&& errno == EBADF) {
	free(sp->_setbuf);
    }

    free(sp);

    /*
     * If this was the current screen, reset everything that the
     * application might try to use (except cur_term, which may have
     * multiple references in different screens).
     */
    if (sp == SP) {
	curscr = 0;
	newscr = 0;
	stdscr = 0;
	COLORS = 0;
	COLOR_PAIRS = 0;
	_nc_set_screen(0);
    }
    returnVoid;
}

static ripoff_t rippedoff[5];
static ripoff_t *rsp = rippedoff;
#define N_RIPS SIZEOF(rippedoff)

static bool
no_mouse_event(SCREEN * sp GCC_UNUSED)
{
    return FALSE;
}

static bool
no_mouse_inline(SCREEN * sp GCC_UNUSED)
{
    return FALSE;
}

static bool
no_mouse_parse(int code GCC_UNUSED)
{
    return TRUE;
}

static void
no_mouse_resume(SCREEN * sp GCC_UNUSED)
{
}

static void
no_mouse_wrap(SCREEN * sp GCC_UNUSED)
{
}

#if NCURSES_EXT_FUNCS && USE_COLORFGBG
static char *
extract_fgbg(char *src, int *result)
{
    char *dst = 0;
    long value = strtol(src, &dst, 0);

    if (dst == 0) {
	dst = src;
    } else if (value >= 0) {
	*result = value % max_colors;
    }
    while (*dst != 0 && *dst != ';')
	dst++;
    if (*dst == ';')
	dst++;
    return dst;
}
#endif

NCURSES_EXPORT(int)
_nc_setupscreen
(short slines, short const scolumns, FILE * output)
/* OS-independent screen initializations */
{
    int bottom_stolen = 0;
    size_t i;

    assert(SP == 0);		/* has been reset in newterm() ! */
    if (!_nc_alloc_screen())
	return ERR;

    SP->_next_screen = _nc_screen_chain;
    _nc_screen_chain = SP;

    _nc_set_buffer(output, TRUE);
    SP->_term = cur_term;
    SP->_lines = slines;
    SP->_lines_avail = slines;
    SP->_columns = scolumns;
    SP->_cursrow = -1;
    SP->_curscol = -1;
    SP->_nl = TRUE;
    SP->_raw = FALSE;
    SP->_cbreak = 0;
    SP->_echo = TRUE;
    SP->_fifohead = -1;
    SP->_endwin = TRUE;
    SP->_ofp = output;
    SP->_cursor = -1;		/* cannot know real cursor shape */

#if NCURSES_NO_PADDING
    SP->_no_padding = getenv("NCURSES_NO_PADDING") != 0;
    TR(TRACE_CHARPUT | TRACE_MOVE, ("padding will%s be used",
				    SP->_no_padding ? " not" : ""));
#endif

#if NCURSES_EXT_FUNCS
    SP->_default_color = FALSE;
    SP->_has_sgr_39_49 = FALSE;

    /*
     * Set our assumption of the terminal's default foreground and background
     * colors.  The curs_color man-page states that we can assume that the
     * background is black.  The origin of this assumption appears to be
     * terminals that displayed colored text, but no colored backgrounds, e.g.,
     * the first colored terminals around 1980.  More recent ones with better
     * technology can display not only colored backgrounds, but all
     * combinations.  So a terminal might be something other than "white" on
     * black (green/black looks monochrome too), but black on white or even
     * on ivory.
     *
     * White-on-black is the simplest thing to use for monochrome.  Almost
     * all applications that use color paint both text and background, so
     * the distinction is moot.  But a few do not - which is why we leave this
     * configurable (a better solution is to use assume_default_colors() for
     * the rare applications that do require that sort of appearance, since
     * is appears that more users expect to be able to make a white-on-black
     * or black-on-white display under control of the application than not).
     */
#ifdef USE_ASSUMED_COLOR
    SP->_default_fg = COLOR_WHITE;
    SP->_default_bg = COLOR_BLACK;
#else
    SP->_default_fg = C_MASK;
    SP->_default_bg = C_MASK;
#endif

#if USE_COLORFGBG
    /*
     * If rxvt's $COLORFGBG variable is set, use it to specify the assumed
     * default colors.  Note that rxvt (mis)uses bold colors, equating a bold
     * color to that value plus 8.  We'll only use the non-bold color for now -
     * decide later if it is worth having default attributes as well.
     */
    if (getenv("COLORFGBG") != 0) {
	char *p = getenv("COLORFGBG");
	p = extract_fgbg(p, &(SP->_default_fg));
	p = extract_fgbg(p, &(SP->_default_bg));
    }
#endif
#endif /* NCURSES_EXT_FUNCS */

    SP->_maxclick = DEFAULT_MAXCLICK;
    SP->_mouse_event = no_mouse_event;
    SP->_mouse_inline = no_mouse_inline;
    SP->_mouse_parse = no_mouse_parse;
    SP->_mouse_resume = no_mouse_resume;
    SP->_mouse_wrap = no_mouse_wrap;
    SP->_mouse_fd = -1;

    /* initialize the panel hooks */
    SP->_panelHook.top_panel = (struct panel *) 0;
    SP->_panelHook.bottom_panel = (struct panel *) 0;
    SP->_panelHook.stdscr_pseudo_panel = (struct panel *) 0;

    /*
     * If we've no magic cookie support, we suppress attributes that xmc
     * would affect, i.e., the attributes that affect the rendition of a
     * space.  Note that this impacts the alternate character set mapping
     * as well.
     */
    if (magic_cookie_glitch > 0) {

	SP->_xmc_triggers = termattrs() & (
					      A_ALTCHARSET |
					      A_BLINK |
					      A_BOLD |
					      A_REVERSE |
					      A_STANDOUT |
					      A_UNDERLINE
	    );
	SP->_xmc_suppress = SP->_xmc_triggers & (chtype) ~ (A_BOLD);

	T(("magic cookie attributes %s", _traceattr(SP->_xmc_suppress)));
#if USE_XMC_SUPPORT
	/*
	 * To keep this simple, suppress all of the optimization hooks
	 * except for clear_screen and the cursor addressing.
	 */
	clr_eol = 0;
	clr_eos = 0;
	set_attributes = 0;
#else
	magic_cookie_glitch = ABSENT_NUMERIC;
	acs_chars = 0;
#endif
    }
    _nc_init_acs();
    memcpy(SP->_acs_map, acs_map, sizeof(chtype) * ACS_LEN);

    _nc_idcok = TRUE;
    _nc_idlok = FALSE;

    _nc_windows = 0;		/* no windows yet */

    SP->oldhash = 0;
    SP->newhash = 0;

    T(("creating newscr"));
    if ((newscr = newwin(slines, scolumns, 0, 0)) == 0)
	return ERR;

    T(("creating curscr"));
    if ((curscr = newwin(slines, scolumns, 0, 0)) == 0)
	return ERR;

    SP->_newscr = newscr;
    SP->_curscr = curscr;
#if USE_SIZECHANGE
    SP->_resize = resizeterm;
#endif

    newscr->_clear = TRUE;
    curscr->_clear = FALSE;

    for (i = 0, rsp = rippedoff; rsp->line && (i < N_RIPS); rsp++, i++) {
	if (rsp->hook) {
	    WINDOW *w;
	    int count = (rsp->line < 0) ? -rsp->line : rsp->line;

	    if (rsp->line < 0) {
		w = newwin(count, scolumns, SP->_lines_avail - count, 0);
		if (w) {
		    rsp->w = w;
		    rsp->hook(w, scolumns);
		    bottom_stolen += count;
		} else
		    return ERR;
	    } else {
		w = newwin(count, scolumns, 0, 0);
		if (w) {
		    rsp->w = w;
		    rsp->hook(w, scolumns);
		    SP->_topstolen += count;
		} else
		    return ERR;
	    }
	    SP->_lines_avail -= count;
	}
	rsp->line = 0;
    }
    /* reset the stack */
    rsp = rippedoff;

    T(("creating stdscr"));
    assert((SP->_lines_avail + SP->_topstolen + bottom_stolen) == slines);
    if ((stdscr = newwin(LINES = SP->_lines_avail, scolumns, 0, 0)) == 0)
	return ERR;
    SP->_stdscr = stdscr;

    def_shell_mode();
    def_prog_mode();

    return OK;
}

/* The internal implementation interprets line as the number of
   lines to rip off from the top or bottom.
   */
NCURSES_EXPORT(int)
_nc_ripoffline(int line, int (*init) (WINDOW *, int))
{
    if (line == 0)
	return (OK);

    if (rsp >= rippedoff + N_RIPS)
	return (ERR);

    rsp->line = line;
    rsp->hook = init;
    rsp->w = 0;
    rsp++;

    return (OK);
}

NCURSES_EXPORT(int)
ripoffline(int line, int (*init) (WINDOW *, int))
{
    T((T_CALLED("ripoffline(%d,%p)"), line, init));

    if (line == 0)
	returnCode(OK);

    returnCode(_nc_ripoffline((line < 0) ? -1 : 1, init));
}