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lib_newterm.c

/****************************************************************************
 * Copyright (c) 1998-2001,2002 Free Software Foundation, Inc.              *
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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
**    lib_newterm.c
**
**    The newterm() function.
**
*/

#include <curses.priv.h>

#if SVR4_TERMIO && !defined(_POSIX_SOURCE)
#define _POSIX_SOURCE
#endif

#include <term.h>       /* clear_screen, cup & friends, cur_term */
#include <tic.h>

MODULE_ID("$Id: lib_newterm.c,v 1.57 2002/10/20 00:10:56 Philippe.Blain Exp $")

#ifndef ONLCR                 /* Allows compilation under the QNX 4.2 OS */
#define ONLCR 0
#endif

/*
 * SVr4/XSI Curses specify that hardware echo is turned off in initscr, and not
 * restored during the curses session.  The library simulates echo in software.
 * (The behavior is unspecified if the application enables hardware echo).
 *
 * The newterm function also initializes terminal settings, and since initscr
 * is supposed to behave as if it calls newterm, we do it here.
 */
static inline int
_nc_initscr(void)
{
    int result = ERR;

    /* for extended XPG4 conformance requires cbreak() at this point */
    /* (SVr4 curses does this anyway) */
    if (cbreak() == OK) {
      TTY buf;

      buf = cur_term->Nttyb;
#ifdef TERMIOS
      buf.c_lflag &= ~(ECHO | ECHONL);
      buf.c_iflag &= ~(ICRNL | INLCR | IGNCR);
      buf.c_oflag &= ~(ONLCR);
#else
      buf.sg_flags &= ~(ECHO | CRMOD);
#endif
      if ((result = _nc_set_tty_mode(&buf)) == OK)
          cur_term->Nttyb = buf;
    }
    return result;
}

/*
 * filter() has to be called before either initscr() or newterm(), so there is
 * apparently no way to make this flag apply to some terminals and not others,
 * aside from possibly delaying a filter() call until some terminals have been
 * initialized.
 */
static int filter_mode = FALSE;

NCURSES_EXPORT(void)
filter(void)
{
    T((T_CALLED("filter")));
    filter_mode = TRUE;
    returnVoid;
}

NCURSES_EXPORT(SCREEN *)
newterm(NCURSES_CONST char *name, FILE * ofp, FILE * ifp)
{
    int errret;
    int slk_format = _nc_slk_format;
    SCREEN *current;

    START_TRACE();
    T((T_CALLED("newterm(\"%s\",%p,%p)"), name, ofp, ifp));

    /* this loads the capability entry, then sets LINES and COLS */
    if (setupterm(name, fileno(ofp), &errret) == ERR)
      returnSP(0);

    /* implement filter mode */
    if (filter_mode) {
      LINES = 1;

      clear_screen = 0;
      cursor_down = parm_down_cursor = 0;
      cursor_address = 0;
      cursor_up = parm_up_cursor = 0;
      row_address = 0;

      cursor_home = carriage_return;
    }

    /* If we must simulate soft labels, grab off the line to be used.
       We assume that we must simulate, if it is none of the standard
       formats (4-4  or 3-2-3) for which there may be some hardware
       support. */
    if (num_labels <= 0 || !SLK_STDFMT(slk_format))
      if (slk_format) {
          if (ERR == _nc_ripoffline(-SLK_LINES(slk_format),
                              _nc_slk_initialize))
            returnSP(0);
      }
    /* this actually allocates the screen structure, and saves the
     * original terminal settings.
     */
    current = SP;
    _nc_set_screen(0);
    if (_nc_setupscreen(LINES, COLS, ofp) == ERR) {
      _nc_set_screen(current);
      returnSP(0);
    }

    /* if the terminal type has real soft labels, set those up */
    if (slk_format && num_labels > 0 && SLK_STDFMT(slk_format))
      _nc_slk_initialize(stdscr, COLS);

    SP->_ifd = fileno(ifp);
    typeahead(fileno(ifp));
#ifdef TERMIOS
    SP->_use_meta = ((cur_term->Ottyb.c_cflag & CSIZE) == CS8 &&
                 !(cur_term->Ottyb.c_iflag & ISTRIP));
#else
    SP->_use_meta = FALSE;
#endif
    SP->_endwin = FALSE;

    /* Check whether we can optimize scrolling under dumb terminals in case
     * we do not have any of these capabilities, scrolling optimization
     * will be useless.
     */
    SP->_scrolling = ((scroll_forward && scroll_reverse) ||
                  ((parm_rindex || parm_insert_line || insert_line) &&
                   (parm_index || parm_delete_line || delete_line)));

    baudrate();               /* sets a field in the SP structure */

    SP->_keytry = 0;

    /*
     * Check for mismatched graphic-rendition capabilities.  Most SVr4
     * terminfo trees contain entries that have rmul or rmso equated to
     * sgr0 (Solaris curses copes with those entries).  We do this only for
     * curses, since many termcap applications assume that smso/rmso and
     * smul/rmul are paired, and will not function properly if we remove
     * rmso or rmul.  Curses applications shouldn't be looking at this
     * detail.
     */
#define SGR0_TEST(mode) (mode != 0) && (exit_attribute_mode == 0 || strcmp(mode, exit_attribute_mode))
    SP->_use_rmso = SGR0_TEST(exit_standout_mode);
    SP->_use_rmul = SGR0_TEST(exit_underline_mode);

    /* compute movement costs so we can do better move optimization */
    _nc_mvcur_init();

    /* initialize terminal to a sane state */
    _nc_screen_init();

    /* Initialize the terminal line settings. */
    _nc_initscr();

    _nc_signal_handler(TRUE);

    returnSP(SP);
}

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