| /**************************************************************************** |
| * Copyright 2020,2021 Thomas E. Dickey * |
| * Copyright 2016,2017 Free Software Foundation, Inc. * |
| * * |
| * Permission is hereby granted, free of charge, to any person obtaining a * |
| * copy of this software and associated documentation files (the * |
| * "Software"), to deal in the Software without restriction, including * |
| * without limitation the rights to use, copy, modify, merge, publish, * |
| * distribute, distribute with modifications, sublicense, and/or sell * |
| * copies of the Software, and to permit persons to whom the Software is * |
| * furnished to do so, subject to the following conditions: * |
| * * |
| * The above copyright notice and this permission notice shall be included * |
| * in all copies or substantial portions of the Software. * |
| * * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * |
| * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * |
| * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * |
| * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * |
| * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * |
| * * |
| * Except as contained in this notice, the name(s) of the above copyright * |
| * holders shall not be used in advertising or otherwise to promote the * |
| * sale, use or other dealings in this Software without prior written * |
| * authorization. * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Author: Thomas E. Dickey * |
| ****************************************************************************/ |
| |
| #define USE_LIBTINFO |
| #include <tty_settings.h> |
| |
| #include <fcntl.h> |
| |
| MODULE_ID("$Id: tty_settings.c,v 1.7 2021/10/08 23:53:32 tom Exp $") |
| |
| static int my_fd; |
| static TTY original_settings; |
| static bool can_restore = FALSE; |
| |
| static void |
| failed(const char *msg) |
| { |
| int code = errno; |
| |
| (void) fprintf(stderr, "%s: %s: %s\n", _nc_progname, msg, strerror(code)); |
| restore_tty_settings(); |
| (void) fprintf(stderr, "\n"); |
| ExitProgram(ErrSystem(code)); |
| /* NOTREACHED */ |
| } |
| |
| static bool |
| get_tty_settings(int fd, TTY * tty_settings) |
| { |
| bool success = TRUE; |
| my_fd = fd; |
| if (fd < 0 || GET_TTY(my_fd, tty_settings) < 0) { |
| success = FALSE; |
| } |
| return success; |
| } |
| |
| /* |
| * Open a file descriptor on the current terminal, to obtain its settings. |
| * stderr is less likely to be redirected than stdout; try that first. |
| */ |
| int |
| save_tty_settings(TTY * tty_settings, bool need_tty) |
| { |
| if (!get_tty_settings(STDERR_FILENO, tty_settings) && |
| !get_tty_settings(STDOUT_FILENO, tty_settings) && |
| !get_tty_settings(STDIN_FILENO, tty_settings)) { |
| if (need_tty) { |
| int fd = open("/dev/tty", O_RDWR); |
| if (!get_tty_settings(fd, tty_settings)) { |
| failed("terminal attributes"); |
| } |
| } else { |
| my_fd = fileno(stdout); |
| } |
| } else { |
| can_restore = TRUE; |
| original_settings = *tty_settings; |
| } |
| return my_fd; |
| } |
| |
| void |
| restore_tty_settings(void) |
| { |
| if (can_restore) |
| SET_TTY(my_fd, &original_settings); |
| } |
| |
| /* Set the modes if they've changed. */ |
| void |
| update_tty_settings(TTY * old_settings, TTY * new_settings) |
| { |
| if (memcmp(new_settings, old_settings, sizeof(TTY))) { |
| SET_TTY(my_fd, new_settings); |
| } |
| } |