e18651243e
While I didn't plan another upgrade, This version incorporate fixes from kevans@ so let's upgrade to it
106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/****************************************************************************
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* Copyright 2020 Thomas E. Dickey *
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* Copyright 2016,2017 Free Software Foundation, Inc. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the *
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* "Software"), to deal in the Software without restriction, including *
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* without limitation the rights to use, copy, modify, merge, publish, *
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* distribute, distribute with modifications, sublicense, and/or sell *
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* copies of the Software, and to permit persons to whom the Software is *
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* furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included *
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* in all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Except as contained in this notice, the name(s) of the above copyright *
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* holders shall not be used in advertising or otherwise to promote the *
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* sale, use or other dealings in this Software without prior written *
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* authorization. *
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****************************************************************************/
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/****************************************************************************
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* Author: Thomas E. Dickey *
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****************************************************************************/
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#define USE_LIBTINFO
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#include <tty_settings.h>
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#include <fcntl.h>
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MODULE_ID("$Id: tty_settings.c,v 1.6 2020/02/02 23:34:34 tom Exp $")
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static int my_fd;
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static TTY original_settings;
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static bool can_restore = FALSE;
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static void
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failed(const char *msg)
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{
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int code = errno;
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(void) fprintf(stderr, "%s: %s: %s\n", _nc_progname, msg, strerror(code));
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restore_tty_settings();
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(void) fprintf(stderr, "\n");
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ExitProgram(ErrSystem(code));
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/* NOTREACHED */
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}
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static bool
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get_tty_settings(int fd, TTY * tty_settings)
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{
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bool success = TRUE;
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my_fd = fd;
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if (fd < 0 || GET_TTY(my_fd, tty_settings) < 0) {
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success = FALSE;
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}
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return success;
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}
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/*
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* Open a file descriptor on the current terminal, to obtain its settings.
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* stderr is less likely to be redirected than stdout; try that first.
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*/
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int
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save_tty_settings(TTY * tty_settings, bool need_tty)
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{
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if (!get_tty_settings(STDERR_FILENO, tty_settings) &&
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!get_tty_settings(STDOUT_FILENO, tty_settings) &&
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!get_tty_settings(STDIN_FILENO, tty_settings) &&
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!get_tty_settings(open("/dev/tty", O_RDWR), tty_settings)) {
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if (need_tty) {
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failed("terminal attributes");
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} else {
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my_fd = fileno(stdout);
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}
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} else {
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can_restore = TRUE;
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original_settings = *tty_settings;
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}
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return my_fd;
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}
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void
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restore_tty_settings(void)
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{
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if (can_restore)
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SET_TTY(my_fd, &original_settings);
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}
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/* Set the modes if they've changed. */
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void
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update_tty_settings(TTY * old_settings, TTY * new_settings)
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{
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if (memcmp(new_settings, old_settings, sizeof(TTY))) {
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SET_TTY(my_fd, new_settings);
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}
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}
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