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/**************************************************************************
**************************************************************************
** **
** termstate.c terminal state functions **
** =========== **
** **
** Purpose: Provides functions to simplifify management of some **
** terminal states. **
** **
** Author: Garrett D'Amore <garrett@sciences.sdsu.edu> **
** **
** Copyright: 1994, Garrett E. D'Amore **
** **
** NO WARRANTY: This program is provided entirely without warranty. **
** The user assumes full responsibility for the use of **
** this program, and agrees to indemnify the author and **
** the copyright holder from any damage or loss that **
** may result from the use of or inability to use this **
** program. In simple language: YOU USE THIS PROGRAM **
** AT YOUR OWN RISK! **
** **
** Warning: None. **
** **
** Restrictions: None. **
** **
** Algorithm: None. **
** **
** References: None. **
** **
** File formats: None. **
** **
** Rev. History: June 4, 1994 Garrett D'Amore **
** -- Initial coding. **
** **
** Notes: None. **
** **
**************************************************************************
**************************************************************************/
/* >>>>>>>>>> Headers <<<<<<<<<< */
#include <errno.h>
#if defined (SGTTY)
#include <sgtty.h>
#elif defined (SYSV_TERMIO)
#include <termio.h>
#else /* POSIX_TERMIOS */
#include <termios.h>
#endif
#include <unistd.h>
#include "termstate.h"
/* >>>>>>>>>> Functions <<<<<<<<<< */
/***************************************
*
* save_termstate Save terminal state.
*
* Purpose Saves the terminal state so that we can restore
* it later.
*
* Parameters fd: filedescriptor to save
* state: pointer to area to save state at
*
* Returns zero on success,
* non-zero on failure.
*
*/
int save_termstate (int fd, termstate *state)
{
if (!isatty (fd)) return (ENOTTY);
#if defined (SGTTY)
return (gtty (fd, state));
#elif defined (SYSV_TERMIO)
return (ioctl (fd, TCGETA, state));
#else /* POSIX_TERMIOS */
return (tcgetattr (fd, state));
#endif
}
/***************************************
*
* restore_termstate Restore terminal state.
*
* Purpose Restores a terminal state saved with
* save_termstate.
*
* Parameters fd: file descriptor associated with terminal
* state: previously saved termstate
*
* Returns zero on success,
* non-zero on error.
*
*/
int restore_termstate (int fd, termstate *state)
{
if (!isatty (fd)) return (ENOTTY);
#if defined (SGTTY)
return (stty (fd, state));
#elif defined (SYSV_TERMIO)
return (ioctl (fd, TCSETAW, state));
#else /* POSIX_TERMIOS */
return (tcsetattr (fd, TCSADRAIN, state));
#endif
}
/***************************************
*
* raw_termstate Sets a termstate to raw mode.
*
* Purpose Modifies a termstate structure so that
* it has no ouput postprocessing.
*
* Parameters state: terminal state structure to modify
*
* Returns None.
*
*/
void raw_termstate (termstate *state)
{
#ifdef SGTTY
state->sg_flags |= RAW;
#else /* SYSV_TERMIO || POSIX_TERMIOS */
state->c_oflag |= OPOST;
#endif
return;
}
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