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tty.c

/*-
 * Copyright (c) 1992, 1993, 1994
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)tty.c   8.6 (Berkeley) 1/10/95";
#endif /* not lint */

#include <stdlib.h>
#include <termios.h>
#include <unistd.h>

#include "curses.h"

/*
 * In general, curses should leave tty hardware settings alone (speed, parity,
 * word size).  This is most easily done in BSD by using TCSASOFT on all
 * tcsetattr calls.  On other systems, it would be better to get and restore
 * those attributes at each change, or at least when stopped and restarted.
 * See also the comments in getterm().
 */
#ifdef TCSASOFT
int __tcaction = 1;                 /* Ignore hardware settings. */
#else
int __tcaction = 0;
#endif

struct termios __orig_termios, __baset;
static struct termios cbreakt, rawt, *curt;
static int useraw;

#ifndef     OXTABS
#ifdef      XTABS             /* SMI uses XTABS. */
#define     OXTABS      XTABS
#else
#define     OXTABS      0
#endif
#endif

/*
 * gettmode --
 *    Do terminal type initialization.
 */
int
gettmode()
{
      useraw = 0;
      
      if (tcgetattr(STDIN_FILENO, &__orig_termios))
            return (ERR);

      __baset = __orig_termios;
      __baset.c_oflag &= ~OXTABS;

      GT = 0;           /* historical. was used before we wired OXTABS off */
      NONL = (__baset.c_oflag & ONLCR) == 0;

      /*
       * XXX
       * System V and SMI systems overload VMIN and VTIME, such that
       * VMIN is the same as the VEOF element, and VTIME is the same
       * as the VEOL element.  This means that, if VEOF was ^D, the
       * default VMIN is 4.  Majorly stupid.
       */
      cbreakt = __baset;
      cbreakt.c_lflag &= ~ICANON;
      cbreakt.c_cc[VMIN] = 1;
      cbreakt.c_cc[VTIME] = 0;

      rawt = cbreakt;
      rawt.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|INLCR|IGNCR|ICRNL|IXON);
      rawt.c_oflag &= ~OPOST;
      rawt.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);

      /*
       * In general, curses should leave hardware-related settings alone.
       * This includes parity and word size.  Older versions set the tty
       * to 8 bits, no parity in raw(), but this is considered to be an
       * artifact of the old tty interface.  If it's desired to change
       * parity and word size, the TCSASOFT bit has to be removed from the
       * calls that switch to/from "raw" mode.
       */
      if (!__tcaction) {
            rawt.c_iflag &= ~ISTRIP;
            rawt.c_cflag &= ~(CSIZE|PARENB);
            rawt.c_cflag |= CS8;
      }

      curt = &__baset;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}

int
raw()
{
      useraw = __pfast = __rawmode = 1;
      curt = &rawt;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}

int
noraw()
{
      useraw = __pfast = __rawmode = 0;
      curt = &__baset;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}

int
cbreak()
{

      __rawmode = 1;
      curt = useraw ? &rawt : &cbreakt;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}

int
nocbreak()
{

      __rawmode = 0;
      curt = useraw ? &rawt : &__baset;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}
      
int
echo()
{
      rawt.c_lflag |= ECHO;
      cbreakt.c_lflag |= ECHO;
      __baset.c_lflag |= ECHO;
      
      __echoit = 1;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}

int
noecho()
{
      rawt.c_lflag &= ~ECHO;
      cbreakt.c_lflag &= ~ECHO;
      __baset.c_lflag &= ~ECHO;
      
      __echoit = 0;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}

int
nl()
{
      rawt.c_iflag |= ICRNL;
      rawt.c_oflag |= ONLCR;
      cbreakt.c_iflag |= ICRNL;
      cbreakt.c_oflag |= ONLCR;
      __baset.c_iflag |= ICRNL;
      __baset.c_oflag |= ONLCR;

      __pfast = __rawmode;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}

int
nonl()
{
      rawt.c_iflag &= ~ICRNL;
      rawt.c_oflag &= ~ONLCR;
      cbreakt.c_iflag &= ~ICRNL;
      cbreakt.c_oflag &= ~ONLCR;
      __baset.c_iflag &= ~ICRNL;
      __baset.c_oflag &= ~ONLCR;

      __pfast = 1;
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}

void
__startwin()
{
      static char *stdbuf;
      static size_t len;

      (void)fflush(stdout);

      /*
       * Some C libraries default to a 1K buffer when talking to a tty.
       * With a larger screen, especially across a network, we'd like
       * to get it to all flush in a single write.  Make it twice as big
       * as just the characters (so that we have room for cursor motions
       * and standout information) but no more than 8K.
       */
      if (stdbuf == NULL) {
            if ((len = LINES * COLS * 2) > 8192)
                  len = 8192;
            if ((stdbuf = malloc(len)) == NULL)
                  len = 0;
      }
      (void)setvbuf(stdout, stdbuf, _IOFBF, len);

      tputs(TI, 0, __cputchar);
      tputs(VS, 0, __cputchar);
}

int
endwin()
{
      __restore_stophandler();

      if (curscr != NULL) {
            if (curscr->flags & __WSTANDOUT) {
                  tputs(SE, 0, __cputchar);
                  curscr->flags &= ~__WSTANDOUT;
            }
            __mvcur(curscr->cury, curscr->curx, curscr->maxy - 1, 0, 0);
      }

      (void)tputs(VE, 0, __cputchar);
      (void)tputs(TE, 0, __cputchar);
      (void)fflush(stdout);
      (void)setvbuf(stdout, NULL, _IOLBF, 0);

      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, &__orig_termios) ? ERR : OK);
}

/*
 * The following routines, savetty and resetty are completely useless and
 * are left in only as stubs.  If people actually use them they will almost
 * certainly screw up the state of the world.
 */
static struct termios savedtty;
int
savetty()
{
      return (tcgetattr(STDIN_FILENO, &savedtty) ? ERR : OK);
}

int
resetty()
{
      return (tcsetattr(STDIN_FILENO, __tcaction ?
          TCSASOFT | TCSADRAIN : TCSADRAIN, &savedtty) ? ERR : OK);
}

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