diff options
Diffstat (limited to 'progs/tty_settings.c')
| -rw-r--r-- | progs/tty_settings.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/progs/tty_settings.c b/progs/tty_settings.c new file mode 100644 index 0000000..274de9f --- /dev/null +++ b/progs/tty_settings.c @@ -0,0 +1,105 @@ +/**************************************************************************** + * Copyright 2020 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 1.6 2020/02/02 23:34:34 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) && + !get_tty_settings(open("/dev/tty", O_RDWR), tty_settings)) { + if (need_tty) { + 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); + } +} |