lib_setup.c

ncurses 库 可能有用酒用 没用就算了 我觉得还可以用

/****************************************************************************
 * Copyright (c) 1998-2004,2005 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 <[e-mail]> 1992,1995               *
 *     and: Eric S. Raymond <[e-mail]>                         *
 *     and: Thomas E. Dickey 1996-2003                                      *
 ****************************************************************************/

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

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

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

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

#include <term.h>		/* lines, columns, cur_term */

MODULE_ID("$Id: lib_setup.c,v 1.88 2005/03/12 19:41:45 tom 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's 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

NCURSES_EXPORT_VAR(char) ttytype[NAMESIZE] = "";
NCURSES_EXPORT_VAR(int) LINES = 0;
NCURSES_EXPORT_VAR(int) COLS = 0;
NCURSES_EXPORT_VAR(int) TABSIZE = 0;

static int _use_env = TRUE;

NCURSES_EXPORT(void)
use_env(bool f)
{
    T((T_CALLED("use_env()")));
    _use_env = f;
    returnVoid;
}

static void
_nc_get_screensize(int *linep, int *colp)
/* Obtain lines/columns values from the environment and/or terminfo entry */
{
    /* figure out the size of the screen */
    T(("screen size: terminfo lines = %d columns = %d", lines, columns));

    if (!_use_env) {
	*linep = (int) lines;
	*colp = (int) columns;
    } else {			/* usually want to query LINES and COLUMNS from environment */
	int value;

	*linep = *colp = 0;

	/* first, look for environment variables */
	if ((value = _nc_getenv_num("LINES")) > 0) {
	    *linep = value;
	}
	if ((value = _nc_getenv_num("COLUMNS")) > 0) {
	    *colp = value;
	}
	T(("screen size: environment LINES = %d COLUMNS = %d", *linep, *colp));

#ifdef __EMX__
	if (*linep <= 0 || *colp <= 0) {
	    int screendata[2];
	    _scrsize(screendata);
	    *colp = screendata[0];
	    *linep = screendata[1];
	    T(("EMX screen size: environment LINES = %d COLUMNS = %d",
	       *linep, *colp));
	}
#endif
#if HAVE_SIZECHANGE
	/* if that didn't work, maybe we can try asking the OS */
	if (*linep <= 0 || *colp <= 0) {
	    if (isatty(cur_term->Filedes)) {
		STRUCT_WINSIZE size;

		errno = 0;
		do {
		    if (ioctl(cur_term->Filedes, IOCTL_WINSIZE, &size) < 0
			&& errno != EINTR)
			goto failure;
		} while
		    (errno == EINTR);

		/*
		 * Solaris lets users override either dimension with an
		 * environment variable.
		 */
		if (*linep <= 0)
		    *linep = WINSIZE_ROWS(size);
		if (*colp <= 0)
		    *colp = WINSIZE_COLS(size);
	    }
	    /* FALLTHRU */
	  failure:;
	}
#endif /* HAVE_SIZECHANGE */

	/* 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 = (short) (*linep);
	columns = (short) (*colp);
    }

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

    if (VALID_NUMERIC(init_tabs))
	TABSIZE = (int) init_tabs;
    else
	TABSIZE = 8;
    T(("TABSIZE = %d", TABSIZE));
}

#if USE_SIZECHANGE
NCURSES_EXPORT(void)
_nc_update_screensize(void)
{
    int old_lines = lines;
    int new_lines;
    int old_cols = columns;
    int new_cols;

    _nc_get_screensize(&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 != 0
	&& SP->_resize != 0) {
	if ((new_lines != old_lines) || (new_cols != old_cols))
	    SP->_resize(new_lines, new_cols);
	SP->_sig_winch = FALSE;
    }
}
#endif

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

#define ret_error(code, fmt, arg)	if (errret) {\
					    *errret = code;\
					    returnCode(ERR);\
					} else {\
					    fprintf(stderr, fmt, arg);\
					    exit(EXIT_FAILURE);\
					}

#define ret_error0(code, msg)		if (errret) {\
					    *errret = code;\
					    returnCode(ERR);\
					} else {\
					    fprintf(stderr, msg);\
					    exit(EXIT_FAILURE);\
					}

#if USE_DATABASE || USE_TERMCAP
static int
grab_entry(const char *const tn, TERMTYPE *const tp)
/* return 1 if entry found, 0 if not found, -1 if database not accessible */
{
#if USE_DATABASE
    char filename[PATH_MAX];
#endif
    int status;

    /*
     * $TERM shouldn't contain pathname delimiters.
     */
    if (strchr(tn, '/'))
	return 0;

#if USE_DATABASE
    if ((status = _nc_read_entry(tn, filename, tp)) != 1) {

#if !PURE_TERMINFO
	/*
	 * Try falling back on the termcap file.
	 * Note:  allowing this call links the entire terminfo/termcap
	 * compiler into the startup code.  It's preferable to build a