NetBSD/lib/libcurses/tty.c

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/* $NetBSD: tty.c,v 1.8 1997/09/12 21:08:26 phil Exp $ */
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/*-
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* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* 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.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)tty.c 8.5 (Berkeley) 8/13/94";
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#else
__RCSID("$NetBSD: tty.c,v 1.8 1997/09/12 21:08:26 phil Exp $");
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#endif
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#endif /* not lint */
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#include <stdlib.h>
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#include <termios.h>
#include <unistd.h>
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#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;
int __endwin;
static struct termios cbreakt, rawt, *curt;
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static int useraw;
#ifndef OXTABS
#ifdef XTABS /* SMI uses XTABS. */
#define OXTABS XTABS
#else
#define OXTABS 0
#endif
#endif
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/*
* 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;
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/*
* 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;
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rawt = cbreakt;
rawt.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|INLCR|IGNCR|ICRNL|IXON);
rawt.c_oflag &= ~OPOST;
rawt.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
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/*
* 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);
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}
int
raw()
{
useraw = __pfast = __rawmode = 1;
curt = &rawt;
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
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}
int
noraw()
{
useraw = __pfast = __rawmode = 0;
curt = &__baset;
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
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}
int
cbreak()
{
__rawmode = 1;
curt = useraw ? &rawt : &cbreakt;
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
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}
int
nocbreak()
{
__rawmode = 0;
curt = useraw ? &rawt : &__baset;
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
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}
int
echo()
{
rawt.c_lflag |= ECHO;
cbreakt.c_lflag |= ECHO;
__baset.c_lflag |= ECHO;
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__echoit = 1;
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
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}
int
noecho()
{
rawt.c_lflag &= ~ECHO;
cbreakt.c_lflag &= ~ECHO;
__baset.c_lflag &= ~ECHO;
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__echoit = 0;
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
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}
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;
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__pfast = __rawmode;
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
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}
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;
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__pfast = 1;
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
}
void
__startwin()
{
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static char *stdbuf;
static size_t len;
(void)fflush(stdout);
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/*
* 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);
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}
int
endwin()
{
__endwin = 1;
return __stopwin();
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}
/*
* 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()
{
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return (tcgetattr(STDIN_FILENO, &savedtty) ? ERR : OK);
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}
int
resetty()
{
return (tcsetattr(STDIN_FILENO, __tcaction ?
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TCSASOFT | TCSADRAIN : TCSADRAIN, &savedtty) ? ERR : OK);
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}