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Annotation of src/usr.bin/tic/tty_settings.c, Revision 1.1

1.1     ! nicm        1: /****************************************************************************
        !             2:  * Copyright 2020,2021 Thomas E. Dickey                                     *
        !             3:  * Copyright 2016,2017 Free Software Foundation, Inc.                       *
        !             4:  *                                                                          *
        !             5:  * Permission is hereby granted, free of charge, to any person obtaining a  *
        !             6:  * copy of this software and associated documentation files (the            *
        !             7:  * "Software"), to deal in the Software without restriction, including      *
        !             8:  * without limitation the rights to use, copy, modify, merge, publish,      *
        !             9:  * distribute, distribute with modifications, sublicense, and/or sell       *
        !            10:  * copies of the Software, and to permit persons to whom the Software is    *
        !            11:  * furnished to do so, subject to the following conditions:                 *
        !            12:  *                                                                          *
        !            13:  * The above copyright notice and this permission notice shall be included  *
        !            14:  * in all copies or substantial portions of the Software.                   *
        !            15:  *                                                                          *
        !            16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
        !            17:  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
        !            18:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
        !            19:  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
        !            20:  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
        !            21:  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
        !            22:  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
        !            23:  *                                                                          *
        !            24:  * Except as contained in this notice, the name(s) of the above copyright   *
        !            25:  * holders shall not be used in advertising or otherwise to promote the     *
        !            26:  * sale, use or other dealings in this Software without prior written       *
        !            27:  * authorization.                                                           *
        !            28:  ****************************************************************************/
        !            29:
        !            30: /****************************************************************************
        !            31:  *  Author: Thomas E. Dickey                                                *
        !            32:  ****************************************************************************/
        !            33:
        !            34: #define USE_LIBTINFO
        !            35: #include <tty_settings.h>
        !            36:
        !            37: #include <fcntl.h>
        !            38:
        !            39: MODULE_ID("$Id: tty_settings.c,v 1.7 2021/10/08 23:53:32 tom Exp $")
        !            40:
        !            41: static int my_fd;
        !            42: static TTY original_settings;
        !            43: static bool can_restore = FALSE;
        !            44:
        !            45: static void
        !            46: failed(const char *msg)
        !            47: {
        !            48:     int code = errno;
        !            49:
        !            50:     (void) fprintf(stderr, "%s: %s: %s\n", _nc_progname, msg, strerror(code));
        !            51:     restore_tty_settings();
        !            52:     (void) fprintf(stderr, "\n");
        !            53:     ExitProgram(ErrSystem(code));
        !            54:     /* NOTREACHED */
        !            55: }
        !            56:
        !            57: static bool
        !            58: get_tty_settings(int fd, TTY * tty_settings)
        !            59: {
        !            60:     bool success = TRUE;
        !            61:     my_fd = fd;
        !            62:     if (fd < 0 || GET_TTY(my_fd, tty_settings) < 0) {
        !            63:        success = FALSE;
        !            64:     }
        !            65:     return success;
        !            66: }
        !            67:
        !            68: /*
        !            69:  * Open a file descriptor on the current terminal, to obtain its settings.
        !            70:  * stderr is less likely to be redirected than stdout; try that first.
        !            71:  */
        !            72: int
        !            73: save_tty_settings(TTY * tty_settings, bool need_tty)
        !            74: {
        !            75:     if (!get_tty_settings(STDERR_FILENO, tty_settings) &&
        !            76:        !get_tty_settings(STDOUT_FILENO, tty_settings) &&
        !            77:        !get_tty_settings(STDIN_FILENO, tty_settings)) {
        !            78:        if (need_tty) {
        !            79:            int fd = open("/dev/tty", O_RDWR);
        !            80:            if (!get_tty_settings(fd, tty_settings)) {
        !            81:                failed("terminal attributes");
        !            82:            }
        !            83:        } else {
        !            84:            my_fd = fileno(stdout);
        !            85:        }
        !            86:     } else {
        !            87:        can_restore = TRUE;
        !            88:        original_settings = *tty_settings;
        !            89:     }
        !            90:     return my_fd;
        !            91: }
        !            92:
        !            93: void
        !            94: restore_tty_settings(void)
        !            95: {
        !            96:     if (can_restore)
        !            97:        SET_TTY(my_fd, &original_settings);
        !            98: }
        !            99:
        !           100: /* Set the modes if they've changed. */
        !           101: void
        !           102: update_tty_settings(TTY * old_settings, TTY * new_settings)
        !           103: {
        !           104:     if (memcmp(new_settings, old_settings, sizeof(TTY))) {
        !           105:        SET_TTY(my_fd, new_settings);
        !           106:     }
        !           107: }