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/**
* Copyright (c) 2007-2012, Timothy Stack
*
* 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.
* * 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.
* * Neither the name of Timothy Stack 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.
*
* @file termios_guard.hh
*/
#ifndef termios_guard_hh
#define termios_guard_hh
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
/**
* RAII class that saves the current termios for a tty and then restores them
* during destruction.
*/
class guard_termios {
public:
/**
* Store the TTY termios settings in this object.
*
* @param fd The tty file descriptor.
*/
guard_termios(const int fd) : gt_fd(fd)
{
memset(&this->gt_termios, 0, sizeof(this->gt_termios));
if (isatty(this->gt_fd)
&& tcgetattr(this->gt_fd, &this->gt_termios) == -1) {
perror("tcgetattr");
}
}
/**
* Restore the TTY termios settings that were captured when this object was
* instantiated.
*/
~guard_termios()
{
if (isatty(this->gt_fd)
&& tcsetattr(this->gt_fd, TCSANOW, &this->gt_termios) == -1)
{
perror("tcsetattr");
}
}
const struct termios* get_termios() const { return &this->gt_termios; }
private:
const int gt_fd;
struct termios gt_termios;
};
#endif
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