/* $OpenBSD: lib_setup.c,v 1.14 2023/10/17 09:52:09 nicm Exp $ */

/****************************************************************************
 * Copyright 2018-2022,2023 Thomas E. Dickey                                *
 * Copyright 1998-2016,2017 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-on                 *
 *     and: Juergen Pfeifer                         2009                    *
 ****************************************************************************/

/*
 * Terminal setup routines common to termcap and terminfo:
 *
 *              use_env(bool)
 *              use_tioctl(bool)
 *              setupterm(char *, int, int *)
 */

#include <curses.priv.h>
#include <tic.h>                /* for MAX_NAME_SIZE */

#if HAVE_LOCALE_H
#include <locale.h>
#endif

MODULE_ID("$Id: lib_setup.c,v 1.14 2023/10/17 09:52:09 nicm Exp $")

/****************************************************************************
 *
 * Terminal size computation
 *
 ****************************************************************************/

#if HAVE_SIZECHANGE
# if !defined(sun) || !TERMIOS
#  if HAVE_SYS_IOCTL_H
#   include <sys/ioctl.h>
#  endif
# endif
#endif

#if NEED_PTEM_H
 /* On SCO, they neglected to define struct winsize in termios.h -- it is only
  * in termio.h and ptem.h (the former conflicts with other definitions).
  */
# include <sys/stream.h>
# include <sys/ptem.h>
#endif

#if HAVE_LANGINFO_CODESET
#include <langinfo.h>
#endif

/*
 * SCO defines TIOCGSIZE and the corresponding struct.  Other systems (SunOS,
 * Solaris, IRIX) define TIOCGWINSZ and struct winsize.
 */
#ifdef TIOCGSIZE
# define IOCTL_WINSIZE TIOCGSIZE
# define STRUCT_WINSIZE struct ttysize
# define WINSIZE_ROWS(n) (int)n.ts_lines
# define WINSIZE_COLS(n) (int)n.ts_cols
#else
# ifdef TIOCGWINSZ
#  define IOCTL_WINSIZE TIOCGWINSZ
#  define STRUCT_WINSIZE struct winsize
#  define WINSIZE_ROWS(n) (int)n.ws_row
#  define WINSIZE_COLS(n) (int)n.ws_col
# endif
#endif

/*
 * Reduce explicit use of "cur_term" global variable.
 */
#undef CUR
#define CUR TerminalType(termp).

/*
 * Wrap global variables in this module.
 */
#if USE_REENTRANT

NCURSES_EXPORT(char *)
NCURSES_PUBLIC_VAR(ttytype) (void)
{
    static char empty[] = "";
    char *result = empty;

#if NCURSES_SP_FUNCS
    if (CURRENT_SCREEN) {
        TERMINAL *termp = TerminalOf(CURRENT_SCREEN);
        if (termp != 0) {
            result = TerminalType(termp).term_names;
        }
    }
#else
    if (cur_term != 0) {
        result = TerminalType(cur_term).term_names;
    }
#endif
    return result;
}

NCURSES_EXPORT(int *)
_nc_ptr_Lines(SCREEN *sp)
{
    return ptrLines(sp);
}

NCURSES_EXPORT(int)
NCURSES_PUBLIC_VAR(LINES) (void)
{
    return *_nc_ptr_Lines(CURRENT_SCREEN);
}

NCURSES_EXPORT(int *)
_nc_ptr_Cols(SCREEN *sp)
{
    return ptrCols(sp);
}

NCURSES_EXPORT(int)
NCURSES_PUBLIC_VAR(COLS) (void)
{
    return *_nc_ptr_Cols(CURRENT_SCREEN);
}

NCURSES_EXPORT(int *)
_nc_ptr_Tabsize(SCREEN *sp)
{
    return ptrTabsize(sp);
}

NCURSES_EXPORT(int)
NCURSES_PUBLIC_VAR(TABSIZE) (void)
{
    return *_nc_ptr_Tabsize(CURRENT_SCREEN);
}
#else
NCURSES_EXPORT_VAR(char) ttytype[NAMESIZE] = "";
NCURSES_EXPORT_VAR(int) LINES = 0;
NCURSES_EXPORT_VAR(int) COLS = 0;
NCURSES_EXPORT_VAR(int) TABSIZE = 8;
#endif

#if NCURSES_EXT_FUNCS
NCURSES_EXPORT(int)
NCURSES_SP_NAME(set_tabsize) (NCURSES_SP_DCLx int value)
{
    int code = OK;
    if (value <= 0) {
        code = ERR;
    } else {
#if USE_REENTRANT
        if (SP_PARM) {
            SP_PARM->_TABSIZE = value;
        } else {
            code = ERR;
        }
#else
        (void) SP_PARM;
        TABSIZE = value;
#endif
    }
    return code;
}

#if NCURSES_SP_FUNCS
NCURSES_EXPORT(int)
set_tabsize(int value)
{
    return NCURSES_SP_NAME(set_tabsize) (CURRENT_SCREEN, value);
}
#endif
#endif /* NCURSES_EXT_FUNCS */

#if USE_SIGWINCH
/*
 * If we have a pending SIGWINCH, set the flag in each screen.
 */
NCURSES_EXPORT(int)
_nc_handle_sigwinch(SCREEN *sp)
{
    SCREEN *scan;

    if (_nc_globals.have_sigwinch) {
        _nc_globals.have_sigwinch = 0;

        for (each_screen(scan)) {
            scan->_sig_winch = TRUE;
        }
    }

    return (sp ? sp->_sig_winch : 0);
}

#endif

NCURSES_EXPORT(void)
NCURSES_SP_NAME(use_env) (NCURSES_SP_DCLx bool f)
{
    START_TRACE();
    T((T_CALLED("use_env(%p,%d)"), (void *) SP_PARM, (int) f));
#if NCURSES_SP_FUNCS
    if (IsPreScreen(SP_PARM)) {
        SP_PARM->_use_env = f;
    }
#else
    _nc_prescreen.use_env = f;
#endif
    returnVoid;
}

NCURSES_EXPORT(void)
NCURSES_SP_NAME(use_tioctl) (NCURSES_SP_DCLx bool f)
{
    START_TRACE();
    T((T_CALLED("use_tioctl(%p,%d)"), (void *) SP_PARM, (int) f));
#if NCURSES_SP_FUNCS
    if (IsPreScreen(SP_PARM)) {
        SP_PARM->use_tioctl = f;
    }
#else
    _nc_prescreen.use_tioctl = f;
#endif
    returnVoid;
}

#if NCURSES_SP_FUNCS
NCURSES_EXPORT(void)
use_env(bool f)
{
    START_TRACE();
    T((T_CALLED("use_env(%d)"), (int) f));
    _nc_prescreen.use_env = f;
    returnVoid;
}

NCURSES_EXPORT(void)
use_tioctl(bool f)
{
    START_TRACE();
    T((T_CALLED("use_tioctl(%d)"), (int) f));
    _nc_prescreen.use_tioctl = f;
    returnVoid;
}
#endif

NCURSES_EXPORT(void)
_nc_get_screensize(SCREEN *sp,
#ifdef USE_TERM_DRIVER
                   TERMINAL *termp,
#endif
                   int *linep, int *colp)
/* Obtain lines/columns values from the environment and/or terminfo entry */
{
#ifdef USE_TERM_DRIVER
    TERMINAL_CONTROL_BLOCK *TCB;
    int my_tabsize;

    assert(termp != 0 && linep != 0 && colp != 0);
    TCB = (TERMINAL_CONTROL_BLOCK *) termp;

    my_tabsize = TCB->info.tabsize;
    TCB->drv->td_size(TCB, linep, colp);

#if USE_REENTRANT
    if (sp != 0) {
        sp->_TABSIZE = my_tabsize;
    }
#else
    (void) sp;
    TABSIZE = my_tabsize;
#endif
    T(("TABSIZE = %d", my_tabsize));
#else /* !USE_TERM_DRIVER */
    TERMINAL *termp = cur_term;
    int my_tabsize;
    bool useEnv = _nc_prescreen.use_env;
    bool useTioctl = _nc_prescreen.use_tioctl;

#ifdef EXP_WIN32_DRIVER
    /* If we are here, then Windows console is used in terminfo mode.
       We need to figure out the size using the console API
     */
    _nc_console_size(linep, colp);
    T(("screen size: winconsole lines = %d columns = %d", *linep, *colp));
#else
    /* figure out the size of the screen */
    T(("screen size: terminfo lines = %d columns = %d", lines, columns));

    *linep = (int) lines;
    *colp = (int) columns;
#endif

#if NCURSES_SP_FUNCS
    if (sp) {
        useEnv = sp->_use_env;
        useTioctl = sp->use_tioctl;
    }
#endif

    if (useEnv || useTioctl) {
#ifdef __EMX__
        {
            int screendata[2];
            _scrsize(screendata);
            *colp = screendata[0];
            *linep = ((sp != 0 && sp->_filtered)
                      ? 1
                      : screendata[1]);
            T(("EMX screen size: environment LINES = %d COLUMNS = %d",
               *linep, *colp));
        }
#endif
#if HAVE_SIZECHANGE
        /* try asking the OS */
        if (NC_ISATTY(cur_term->Filedes)) {
            STRUCT_WINSIZE size;

            errno = 0;
            do {
                if (ioctl(cur_term->Filedes, IOCTL_WINSIZE, &size) >= 0) {
                    *linep = ((sp != 0 && sp->_filtered)
                              ? 1
                              : WINSIZE_ROWS(size));
                    *colp = WINSIZE_COLS(size);
                    T(("SYS screen size: environment LINES = %d COLUMNS = %d",
                       *linep, *colp));
                    break;
                }
            } while
                (errno == EINTR);
        }
#endif /* HAVE_SIZECHANGE */

        if (useEnv) {
            int value;

            if (useTioctl) {
                /*
                 * If environment variables are used, update them.
                 */
                if ((sp == 0 || !sp->_filtered) && _nc_getenv_num("LINES") > 0) {
                    _nc_setenv_num("LINES", *linep);
                }
                if (_nc_getenv_num("COLUMNS") > 0) {
                    _nc_setenv_num("COLUMNS", *colp);
                }
            }

            /*
             * Finally, look for environment variables.
             *
             * Solaris lets users override either dimension with an environment
             * variable.
             */
            if ((value = _nc_getenv_num("LINES")) > 0) {
                *linep = value;
                T(("screen size: environment LINES = %d", *linep));
            }
            if ((value = _nc_getenv_num("COLUMNS")) > 0) {
                *colp = value;
                T(("screen size: environment COLUMNS = %d", *colp));
            }
        }

        /* if we can't get dynamic info about the size, use static */
        if (*linep <= 0) {
            *linep = (int) lines;
        }
        if (*colp <= 0) {
            *colp = (int) columns;
        }

        /* the ultimate fallback, assume fixed 24x80 size */
        if (*linep <= 0) {
            *linep = 24;
        }
        if (*colp <= 0) {
            *colp = 80;
        }

        /*
         * Put the derived values back in the screen-size caps, so
         * tigetnum() and tgetnum() will do the right thing.
         */
        lines = (NCURSES_INT2) (*linep);
        columns = (NCURSES_INT2) (*colp);
#if NCURSES_EXT_NUMBERS
#define OldNumber(termp,name) \
        (termp)->type.Numbers[(&name - (termp)->type2.Numbers)]
        OldNumber(termp, lines) = (short) (*linep);
        OldNumber(termp, columns) = (short) (*colp);
#endif
    }

    T(("screen size is %dx%d", *linep, *colp));

    if (VALID_NUMERIC(init_tabs))
        my_tabsize = (int) init_tabs;
    else
        my_tabsize = 8;

#if USE_REENTRANT
    if (sp != 0)
        sp->_TABSIZE = my_tabsize;
#else
    TABSIZE = my_tabsize;
#endif
    T(("TABSIZE = %d", TABSIZE));
#endif /* USE_TERM_DRIVER */
}

#if USE_SIZECHANGE
NCURSES_EXPORT(void)
_nc_update_screensize(SCREEN *sp)
{
    int new_lines;
    int new_cols;

#ifdef USE_TERM_DRIVER
    int old_lines;
    int old_cols;

    assert(sp != 0);

    CallDriver_2(sp, td_getsize, &old_lines, &old_cols);

#else
    TERMINAL *termp = cur_term;
    int old_lines = lines;
    int old_cols = columns;
#endif

    if (sp != 0) {
        TINFO_GET_SIZE(sp, sp->_term, &new_lines, &new_cols);
        /*
         * See is_term_resized() and resizeterm().
         * We're doing it this way because those functions belong to the upper
         * ncurses library, while this resides in the lower terminfo library.
         */
        if (sp->_resize != 0) {
            if ((new_lines != old_lines) || (new_cols != old_cols)) {
                sp->_resize(NCURSES_SP_ARGx new_lines, new_cols);
            } else if (sp->_sig_winch && (sp->_ungetch != 0)) {
                sp->_ungetch(SP_PARM, KEY_RESIZE);      /* so application can know this */
            }
            sp->_sig_winch = FALSE;
        }
    }
}
#endif /* USE_SIZECHANGE */

/****************************************************************************
 *
 * Terminal setup
 *
 ****************************************************************************/

#if NCURSES_USE_DATABASE || NCURSES_USE_TERMCAP
/*
 * Return 1 if entry found, 0 if not found, -1 if database not accessible,
 * just like tgetent().
 */
int
_nc_setup_tinfo(const char *const tn, TERMTYPE2 *const tp)
{
    char filename[PATH_MAX];
    int status = _nc_read_entry2(tn, filename, tp);

    /*
     * If we have an entry, force all of the cancelled strings to null
     * pointers so we don't have to test them in the rest of the library.
     * (The terminfo compiler bypasses this logic, since it must know if
     * a string is cancelled, for merging entries).
     */
    if (status == TGETENT_YES) {
        unsigned n;
        for_each_boolean(n, tp) {
            if (!VALID_BOOLEAN(tp->Booleans[n]))
                tp->Booleans[n] = FALSE;
        }
        for_each_string(n, tp) {
            if (tp->Strings[n] == CANCELLED_STRING)
                tp->Strings[n] = ABSENT_STRING;
        }
    }
    return (status);
}
#endif

/*
**      Take the real command character out of the CC environment variable
**      and substitute it in for the prototype given in 'command_character'.
*/
void
_nc_tinfo_cmdch(TERMINAL *termp, int proto)
{
    char *tmp;

    /*
     * Only use the character if the string is a single character,
     * since it is fairly common for developers to set the C compiler
     * name as an environment variable - using the same symbol.
     */
    if ((tmp = getenv("CC")) != 0 && strlen(tmp) == 1) {
        unsigned i;
        char CC = *tmp;

        for_each_string(i, &(termp->type)) {
            for (tmp = termp->type.Strings[i]; tmp && *tmp; tmp++) {
                if (UChar(*tmp) == proto)
                    *tmp = CC;
            }
        }
    }
}

/*
 * Find the locale which is in effect.
 */
NCURSES_EXPORT(char *)
_nc_get_locale(void)
{
    char *env;
#if HAVE_LOCALE_H
    /*
     * This is preferable to using getenv() since it ensures that we are using
     * the locale which was actually initialized by the application.
     */
    env = setlocale(LC_CTYPE, 0);
#else
    if (((env = getenv("LANG")) != 0 && *env != '\0')
        || ((env = getenv("LC_CTYPE")) != 0 && *env != '\0')
        || ((env = getenv("LC_ALL")) != 0 && *env != '\0')) {
        ;
    }
#endif
    T(("_nc_get_locale %s", _nc_visbuf(env)));
    return env;
}

/*
 * Check if we are running in a UTF-8 locale.
 */
NCURSES_EXPORT(int)
_nc_unicode_locale(void)
{
    int result = 0;
#if defined(_NC_WINDOWS) && USE_WIDEC_SUPPORT
    result = 1;
#elif HAVE_LANGINFO_CODESET
    char *env = nl_langinfo(CODESET);
    result = !strcmp(env, "UTF-8");
    T(("_nc_unicode_locale(%s) ->%d", env, result));
#else
    char *env = _nc_get_locale();
    if (env != 0) {
        if (strstr(env, ".UTF-8") != 0) {
            result = 1;
            T(("_nc_unicode_locale(%s) ->%d", env, result));
        }
    }
#endif
    return result;
}

#define CONTROL_N(s) ((s) != 0 && strstr(s, "\016") != 0)
#define CONTROL_O(s) ((s) != 0 && strstr(s, "\017") != 0)

/*
 * Check for known broken cases where a UTF-8 locale breaks the alternate
 * character set.
 */
NCURSES_EXPORT(int)
_nc_locale_breaks_acs(TERMINAL *termp)
{
    const char *env_name = "NCURSES_NO_UTF8_ACS";
    const char *env;
    int value;
    int result = 0;

    T((T_CALLED("_nc_locale_breaks_acs:%d"), result));
    if (getenv(env_name) != 0) {
        result = _nc_getenv_num(env_name);
    } else if ((value = tigetnum("U8")) >= 0) {
        result = value;         /* use extension feature */
    } else if ((env = getenv("TERM")) != 0) {
        if (strstr(env, "linux")) {
            result = 1;         /* always broken */
        } else if (strstr(env, "screen") != 0
                   && ((env = getenv("TERMCAP")) != 0
                       && strstr(env, "screen") != 0)
                   && strstr(env, "hhII00") != 0) {
            if (CONTROL_N(enter_alt_charset_mode) ||
                CONTROL_O(enter_alt_charset_mode) ||
                CONTROL_N(set_attributes) ||
                CONTROL_O(set_attributes)) {
                result = 1;
            }
        }
    }
    returnCode(result);
}

NCURSES_EXPORT(int)
TINFO_SETUP_TERM(TERMINAL **tp,
                 const char *tname,
                 int Filedes,
                 int *errret,
                 int reuse)
{
#ifdef USE_TERM_DRIVER
    TERMINAL_CONTROL_BLOCK *TCB = 0;
#endif
    TERMINAL *termp;
    SCREEN *sp = 0;
    char *myname;
    int code = ERR;

    START_TRACE();

#ifdef USE_TERM_DRIVER
    T((T_CALLED("_nc_setupterm_ex(%p,%s,%d,%p)"),
       (void *) tp, _nc_visbuf(tname), Filedes, (void *) errret));

    if (tp == 0) {
        ret_error0(TGETENT_ERR,
                   "Invalid parameter, internal error.\n");
    } else
        termp = *tp;
#else
    termp = cur_term;
    T((T_CALLED("setupterm(%s,%d,%p)"), _nc_visbuf(tname), Filedes, (void *) errret));
#endif

    if (tname == 0) {
        tname = getenv("TERM");
#if defined(EXP_WIN32_DRIVER)
        if (!VALID_TERM_ENV(tname, NO_TERMINAL)) {
            T(("Failure with TERM=%s", NonNull(tname)));
            ret_error0(TGETENT_ERR, "TERM environment variable not set.\n");
        }
#elif defined(USE_TERM_DRIVER)
        if (!NonEmpty(tname))
            tname = "unknown";
#else
        if (!NonEmpty(tname)) {
            T(("Failure with TERM=%s", NonNull(tname)));
            ret_error0(TGETENT_ERR, "TERM environment variable not set.\n");
        }
#endif
    }
    myname = strdup(tname);
    if (myname == NULL || strlen(myname) > MAX_NAME_SIZE) {
        ret_error(TGETENT_ERR,
                  "TERM environment must be 1..%d characters.\n",
                  MAX_NAME_SIZE,
                  free(myname));
    }

    T(("your terminal name is %s", myname));

    /*
     * Allow output redirection.  This is what SVr3 does.  If stdout is
     * directed to a file, screen updates go to standard error.
     */
    if (Filedes == STDOUT_FILENO && !NC_ISATTY(Filedes))
        Filedes = STDERR_FILENO;
#if defined(EXP_WIN32_DRIVER)
    if (Filedes != STDERR_FILENO && NC_ISATTY(Filedes))
        _setmode(Filedes, _O_BINARY);
#endif

    /*
     * Check if we have already initialized to use this terminal.  If so, we
     * do not need to re-read the terminfo entry, or obtain TTY settings.
     *
     * This is an improvement on SVr4 curses.  If an application mixes curses
     * and termcap calls, it may call both initscr and tgetent.  This is not
     * really a good thing to do, but can happen if someone tries using ncurses
     * with the readline library.  The problem we are fixing is that when
     * tgetent calls setupterm, the resulting Ottyb struct in cur_term is
     * zeroed.  A subsequent call to endwin uses the zeroed terminal settings
     * rather than the ones saved in initscr.  So we check if cur_term appears
     * to contain terminal settings for the same output file as our current
     * call - and copy those terminal settings.  (SVr4 curses does not do this,
     * however applications that are working around the problem will still work
     * properly with this feature).
     */
    if (reuse
        && (termp != 0)
        && termp->Filedes == Filedes
        && termp->_termname != 0
        && !strcmp(termp->_termname, myname)
        && _nc_name_match(TerminalType(termp).term_names, myname, "|")) {
        T(("reusing existing terminal information and mode-settings"));
        code = OK;
#ifdef USE_TERM_DRIVER
        TCB = (TERMINAL_CONTROL_BLOCK *) termp;
#endif
    } else {
#ifdef USE_TERM_DRIVER
        TERMINAL_CONTROL_BLOCK *my_tcb;
        termp = 0;
        if ((my_tcb = typeCalloc(TERMINAL_CONTROL_BLOCK, 1)) != 0)
            termp = &(my_tcb->term);
#else
        int status;

        termp = typeCalloc(TERMINAL, 1);
#endif
        if (termp == 0) {
            ret_error1(TGETENT_ERR,
                       "Not enough memory to create terminal structure.\n",
                       myname, free(myname));
        }
        ++_nc_globals.terminal_count;
#if HAVE_SYSCONF
        {
            long limit;
#ifdef LINE_MAX
            limit = LINE_MAX;
#else
            limit = _nc_globals.getstr_limit;
#endif
#ifdef _SC_LINE_MAX
            if (limit < sysconf(_SC_LINE_MAX))
                limit = sysconf(_SC_LINE_MAX);
#endif
            if (_nc_globals.getstr_limit < (int) limit)
                _nc_globals.getstr_limit = (int) limit;
        }
#endif /* HAVE_SYSCONF */
        T(("using %d for getstr limit", _nc_globals.getstr_limit));

#ifdef USE_TERM_DRIVER
        INIT_TERM_DRIVER();
        /*
         * _nc_get_driver() will call td_CanHandle() for each driver, and win_driver
         * needs file descriptor to do the test, so set it before calling.
         */
        termp->Filedes = (short) Filedes;
        TCB = (TERMINAL_CONTROL_BLOCK *) termp;
        code = _nc_globals.term_driver(TCB, myname, errret);
        if (code == OK) {
            termp->_termname = strdup(myname);
        } else {
            ret_error1(errret ? *errret : TGETENT_ERR,
                       "Could not find any driver to handle terminal.\n",
                       myname, free(myname));
        }
#else
#if NCURSES_USE_DATABASE || NCURSES_USE_TERMCAP
        status = _nc_setup_tinfo(myname, &TerminalType(termp));
        T(("_nc_setup_tinfo returns %d", status));
#else
        T(("no database available"));
        status = TGETENT_NO;
#endif

        /* try fallback list if entry on disk */
        if (status != TGETENT_YES) {
            const TERMTYPE2 *fallback = _nc_fallback2(myname);

            if (fallback) {
                T(("found fallback entry"));
                _nc_copy_termtype2(&(TerminalType(termp)), fallback);
                status = TGETENT_YES;
            }
        }

        if (status != TGETENT_YES) {
            del_curterm(termp);
            if (status == TGETENT_ERR) {
                free(myname);
                ret_error0(status, "terminals database is inaccessible\n");
            } else if (status == TGETENT_NO) {
                ret_error1(status, "unknown terminal type.\n",
                           myname, free(myname));
            } else {
                free(myname);
                ret_error0(status, "unexpected return-code\n");
            }
        }
#if NCURSES_EXT_NUMBERS
        _nc_export_termtype2(&termp->type, &TerminalType(termp));
#endif
#if !USE_REENTRANT
        save_ttytype(termp);
#endif

        termp->Filedes = (short) Filedes;
        termp->_termname = strdup(myname);

        set_curterm(termp);

        if (command_character)
            _nc_tinfo_cmdch(termp, UChar(*command_character));

        /*
         * If an application calls setupterm() rather than initscr() or
         * newterm(), we will not have the def_prog_mode() call in
         * _nc_setupscreen().  Do it now anyway, so we can initialize the
         * baudrate.  Also get the shell-mode so that erasechar() works.
         */
        if (NC_ISATTY(Filedes)) {
            NCURSES_SP_NAME(def_shell_mode) (NCURSES_SP_ARG);
            NCURSES_SP_NAME(def_prog_mode) (NCURSES_SP_ARG);
            NCURSES_SP_NAME(baudrate) (NCURSES_SP_ARG);
        }
        code = OK;
#endif
    }

#ifdef USE_TERM_DRIVER
    *tp = termp;
    NCURSES_SP_NAME(set_curterm) (sp, termp);
    TCB->drv->td_init(TCB);
#else
    sp = SP;
#endif

    /*
     * We should always check the screensize, just in case.
     */
    TINFO_GET_SIZE(sp, termp, ptrLines(sp), ptrCols(sp));

    if (errret)
        *errret = TGETENT_YES;

#ifndef USE_TERM_DRIVER
    if (generic_type) {
        /*
         * BSD 4.3's termcap contains mis-typed "gn" for wy99.  Do a sanity
         * check before giving up.
         */
        if ((VALID_STRING(cursor_address)
             || (VALID_STRING(cursor_down) && VALID_STRING(cursor_home)))
            && VALID_STRING(clear_screen)) {
            ret_error1(TGETENT_YES, "terminal is not really generic.\n",
                       myname, free(myname));
        } else {
            del_curterm(termp);
            ret_error1(TGETENT_NO, "I need something more specific.\n",
                       myname, free(myname));
        }
    } else if (hard_copy) {
        ret_error1(TGETENT_YES, "I can't handle hardcopy terminals.\n",
                   myname, free(myname));
    }
#endif
    free(myname);
    returnCode(code);
}

#ifdef USE_PTHREADS
/*
 * Returns a non-null pointer unless a new screen should be allocated because
 * no match was found in the pre-screen cache.
 */
NCURSES_EXPORT(SCREEN *)
_nc_find_prescr(void)
{
    SCREEN *result = 0;
    PRESCREEN_LIST *p;
    pthread_t id = GetThreadID();
    for (p = _nc_prescreen.allocated; p != 0; p = p->next) {
        if (p->id == id) {
            result = p->sp;
            break;
        }
    }
    return result;
}

/*
 * Tells ncurses to forget that this thread was associated with the pre-screen
 * cache.  It does not modify the pre-screen cache itself, since that is used
 * for creating new screens.
 */
NCURSES_EXPORT(void)
_nc_forget_prescr(void)
{
    PRESCREEN_LIST *p, *q;
    pthread_t id = GetThreadID();
    _nc_lock_global(screen);
    for (p = _nc_prescreen.allocated, q = 0; p != 0; q = p, p = p->next) {
        if (p->id == id) {
            if (q) {
                q->next = p->next;
            } else {
                _nc_prescreen.allocated = p->next;
            }
            free(p);
            break;
        }
    }
    _nc_unlock_global(screen);
}
#endif /* USE_PTHREADS */

#if NCURSES_SP_FUNCS
/*
 * In case of handling multiple screens, we need to have a screen before
 * initialization in _nc_setupscreen takes place.  This is to extend the
 * substitute for some of the stuff in _nc_prescreen, especially for slk and
 * ripoff handling which should be done per screen.
 */
NCURSES_EXPORT(SCREEN *)
new_prescr(void)
{
    SCREEN *sp;

    START_TRACE();
    T((T_CALLED("new_prescr()")));

    _nc_lock_global(screen);
    if ((sp = _nc_find_prescr()) == 0) {
        sp = _nc_alloc_screen_sp();
        T(("_nc_alloc_screen_sp %p", (void *) sp));
        if (sp != 0) {
#ifdef USE_PTHREADS
            PRESCREEN_LIST *p = typeCalloc(PRESCREEN_LIST, 1);
            if (p != 0) {
                p->id = GetThreadID();
                p->sp = sp;
                p->next = _nc_prescreen.allocated;
                _nc_prescreen.allocated = p;
            }
#else
            _nc_prescreen.allocated = sp;
#endif
            sp->rsp = sp->rippedoff;
            sp->_filtered = _nc_prescreen.filter_mode;
            sp->_use_env = _nc_prescreen.use_env;
#if NCURSES_NO_PADDING
            sp->_no_padding = _nc_prescreen._no_padding;
#endif
            sp->slk_format = 0;
            sp->_slk = 0;
            sp->_prescreen = TRUE;
            SP_PRE_INIT(sp);
#if USE_REENTRANT
            sp->_TABSIZE = _nc_prescreen._TABSIZE;
            sp->_ESCDELAY = _nc_prescreen._ESCDELAY;
#endif
        }
    } else {
        T(("_nc_alloc_screen_sp %p (reuse)", (void *) sp));
    }
    _nc_unlock_global(screen);
    returnSP(sp);
}
#endif

#ifdef USE_TERM_DRIVER
/*
 * This entrypoint is called from tgetent() to allow a special case of reusing
 * the same TERMINAL data (see comment).
 */
NCURSES_EXPORT(int)
_nc_setupterm(const char *tname,
              int Filedes,
              int *errret,
              int reuse)
{
    int rc = ERR;
    TERMINAL *termp = 0;

    _nc_init_pthreads();
    _nc_lock_global(prescreen);
    START_TRACE();
    if (TINFO_SETUP_TERM(&termp, tname, Filedes, errret, reuse) == OK) {
        _nc_forget_prescr();
        if (NCURSES_SP_NAME(set_curterm) (CURRENT_SCREEN_PRE, termp) != 0) {
            rc = OK;
        }
    }
    _nc_unlock_global(prescreen);

    return rc;
}
#endif

/*
 *      setupterm(termname, Filedes, errret)
 *
 *      Find and read the appropriate object file for the terminal
 *      Make cur_term point to the structure.
 */
NCURSES_EXPORT(int)
setupterm(const char *tname, int Filedes, int *errret)
{
    START_TRACE();
    return _nc_setupterm(tname, Filedes, errret, FALSE);
}