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lib_set_term.c

/****************************************************************************
 * Copyright (c) 1998-2002,2003 Free Software Foundation, Inc.              *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * 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    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 *     and: Thomas E. Dickey                        1996-2003               *
 ****************************************************************************/

/*
**    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 1.81 2003/11/15 23:57:01 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;

    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;
    int i;

    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);

    if (sp->_slk != 0) {
      if (sp->_slk->ent != 0) {
          for (i = 0; i < sp->_slk->labcnt; ++i) {
            FreeIfNeeded(sp->_slk->ent[i].ent_text);
            FreeIfNeeded(sp->_slk->ent[i].form_text);
          }
          free(sp->_slk->ent);
      }
      free(sp->_slk);
      sp->_slk = 0;
    }

    _nc_free_keytry(sp->_keytry);
    sp->_keytry = 0;

    _nc_free_keytry(sp->_key_ok);
    sp->_key_ok = 0;

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

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

    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(SP->_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;
    }
    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;
    int i;

    T((T_CALLED("_nc_setupscreen(%d, %d, %p)"), slines, scolumns, output));
    assert(SP == 0);          /* has been reset in newterm() ! */
    if (!_nc_alloc_screen())
      returnCode(ERR);

    SP->_next_screen = _nc_screen_chain;
    _nc_screen_chain = SP;

#ifdef __DJGPP__
    T(("setting output mode to binary"));
    fflush(output);
    setmode(output, O_BINARY);
#endif
    _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

    /*
     * Allow those assumed/default color assumptions to be overridden at
     * runtime:
     */
    if (getenv("NCURSES_ASSUMED_COLORS") != 0) {
      char *p = getenv("NCURSES_ASSUMED_COLORS");
      int fg, bg;
      char sep1, sep2;
      int count = sscanf(p, "%d%c%d%c", &fg, &sep1, &bg, &sep2);
      if (count >= 1) {
          SP->_default_fg = (fg >= 0 && fg < max_colors) ? fg : C_MASK;
          if (count >= 3) {
            SP->_default_bg = (bg >= 0 && bg < max_colors) ? bg : C_MASK;
          }
          TR(TRACE_CHARPUT | TRACE_MOVE,
             ("from environment assumed fg=%d, bg=%d",
            SP->_default_fg,
            SP->_default_bg));
      }
    }
#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");
      TR(TRACE_CHARPUT | TRACE_MOVE, ("decoding COLORFGBG %s", p));
      p = extract_fgbg(p, &(SP->_default_fg));
      p = extract_fgbg(p, &(SP->_default_bg));
      if (*p)                 /* assume rxvt was compiled with xpm support */
          p = extract_fgbg(p, &(SP->_default_bg));
      TR(TRACE_CHARPUT | TRACE_MOVE, ("decoded fg=%d, bg=%d",
                              SP->_default_fg, SP->_default_bg));
      if (SP->_default_fg >= max_colors) {
          if (set_a_foreground != ABSENT_STRING
            && !strcmp(set_a_foreground, "\033[3%p1%dm")) {
            set_a_foreground = "\033[3%?%p1%{8}%>%t9%e%p1%d%;m";
          } else {
            SP->_default_fg %= max_colors;
          }
      }
      if (SP->_default_bg >= max_colors) {
          if (set_a_background != ABSENT_STRING
            && !strcmp(set_a_background, "\033[4%p1%dm")) {
            set_a_background = "\033[4%?%p1%{8}%>%t9%e%p1%d%;m";
          } else {
            SP->_default_bg %= max_colors;
          }
      }
    }
#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
    }

    /* initialize normal acs before wide, since we use mapping in the latter */
    _nc_init_acs();
#if USE_WIDEC_SUPPORT
    _nc_init_wacs();

    SP->_screen_acs_fix = (_nc_unicode_locale() && _nc_locale_breaks_acs());
    {
      char *env = _nc_get_locale();
      SP->_posix_locale = ((env == 0)
                       || !strcmp(env, "C")
                       || !strcmp(env, "POSIX"));
    }
#endif

    _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)
      returnCode(ERR);

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

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

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

    def_shell_mode();
    def_prog_mode();

    for (i = 0, rsp = rippedoff; rsp->line && (i < (int) N_RIPS); rsp++, i++) {
      T(("ripping off line %d at %s", i, rsp->line < 0 ? "bottom" : "top"));
      SP->_rippedoff[i] = rippedoff[i];
      if (rsp->hook) {
          int count = (rsp->line < 0) ? -rsp->line : rsp->line;

          SP->_rippedoff[i].w = newwin(count,
                               scolumns,
                               ((rsp->line < 0)
                                ? SP->_lines_avail - count
                                : 0),
                               0);
          if (SP->_rippedoff[i].w != 0)
            SP->_rippedoff[i].hook(SP->_rippedoff[i].w, scolumns);
          else
            returnCode(ERR);
          if (rsp->line < 0)
            bottom_stolen += count;
          else
            SP->_topstolen += count;
          SP->_lines_avail -= count;
      }
      rsp->line = 0;
    }
    SP->_rip_count = i;
    /* 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)
      returnCode(ERR);
    SP->_stdscr = stdscr;

    returnCode(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))
{
    T((T_CALLED("_nc_ripoffline(%d, %p)"), line, init));

    if (line != 0) {

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

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

    returnCode(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));
}

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