amiga-clib2/library/termios_tcgetattr.c

/*
 * $Id: termios_tcgetattr.c,v 1.1 2005-06-04 10:46:21 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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	_TERMIOS_HEADERS_H
#include "termios_headers.h"
#endif /* _TERMIOS_HEADERS_H */

/****************************************************************************/

static const cc_t def_console_cc[NCCS]=
{
	3,		/* VINTR	= ETX */
	28,		/* VQUIT	= FS  */
	127,	/* VERASE 	= DEL */
	24,		/* VKILL	= DC4 */
	4,		/* VEOF		= EOT */
	1,		/* VMIN		= Minimum number of characters in a non-canonical read. */
	0,		/* VEOL		= NUL */
	0,		/* VTIME	= Timout in deciseconds for a non-canonical read. */
	17,		/* VSTART	= DC1 */
	19,		/* VSTOP	= DC3 */
	26,		/* VSUSP	= SUB */
	23		/* VWERASE	= ETB */
};

/******************************************************************/

static struct termios *
get_console_termios(struct fd *fd)
{
	struct termios *tios;

	/* Create a new, fresh termios. TODO: Actually query some values,
	   e.g. ICANON and ECHO should not be set for RAW consoles. */
	tios = malloc(sizeof(*tios));
	if(tios == NULL)
	{
		__set_errno(ENOMEM);
		goto out;
	}

	memset(tios,0,sizeof(*tios));

	/* Set up the initial termios state. */
	tios->c_iflag = 0;
	tios->c_oflag = 0;
	tios->c_cflag = CS8|CLOCAL;

	if(FLAG_IS_SET(fd->fd_Flags,FDF_READ))
		SET_FLAG(tios->c_cflag,CREAD);

	tios->c_lflag = ISIG|ICANON|ECHO;

	memcpy(tios->c_cc,def_console_cc,NCCS);

	tios->c_ispeed = B9600;	/* A default as good as any? */
	tios->c_ospeed = B9600;

	tios->type = TIOST_CONSOLE;
	tios->flags = 0;

	/* Change the hook. */
	fd->fd_Action = __termios_console_hook;
	fd->fd_Aux = tios;

	SET_FLAG(fd->fd_Flags,FDF_TERMIOS);

 out:

	return(tios);
}

/******************************************************************/

struct termios *
__get_termios(struct fd *fd)
{
	struct termios *tios = NULL;

	if(FLAG_IS_SET(fd->fd_Flags,FDF_IS_SOCKET)) /* Network socket. Remote terminal? */
	{
		__set_errno(ENODEV);
		goto out;
	}

	if(FLAG_IS_CLEAR(fd->fd_Flags,FDF_IS_INTERACTIVE))
	{
		__set_errno(ENOTTY);
		goto out;
	}

	if(FLAG_IS_SET(fd->fd_Flags,FDF_TERMIOS))
		tios = fd->fd_Aux;
	else
		tios = get_console_termios(fd);

 out:

	return(tios);
}

/******************************************************************/

int
tcgetattr(int file_descriptor,struct termios *user_tios)
{
	int result = ERROR;
	struct fd *fd;
	struct termios *tios;

	if(user_tios == NULL)
	{
		__set_errno(EFAULT);
		goto out;
	}

	fd = __get_file_descriptor(file_descriptor);
	if(fd == NULL)
	{
		__set_errno(EBADF);
		goto out;
	}

	if(FLAG_IS_SET(fd->fd_Flags,FDF_TERMIOS))
	{
		assert(fd->fd_Aux != NULL);

		memcpy(user_tios,fd->fd_Aux,sizeof(struct termios));
	}
	else
	{
		tios = __get_termios(fd);
		if(tios == NULL)
			goto out;

		memcpy(user_tios,tios,sizeof(struct termios));
	}

	result = OK;

out:

	return(result);
}