164 lines
3.8 KiB
C
164 lines
3.8 KiB
C
/* $OpenBSD: term.c,v 1.3 2000/01/12 17:58:08 ho Exp $ */
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/*-
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* Copyright (c) 1999 Marc Espie.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Marc Espie for the OpenBSD
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* Project.
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*
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* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
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* PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Set terminal discipline to non blocking io and such. */
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#include <signal.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/termios.h>
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#include <errno.h>
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#include "mpg123.h"
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#ifdef TERM_CONTROL
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static void sane_tty(void);
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static void suspend(int sig);
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static int run_in_fg(void);
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static void if_fg_sane_tty(void);
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static int may_getchar(void);
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static void set_raw(int);
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static struct termios sanity;
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static struct termios *psanity = NULL;
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static int is_fg;
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#ifdef SIGTSTP
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static void suspend(int sig)
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{
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sane_tty();
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signal(SIGTSTP, SIG_DFL);
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kill(0, SIGTSTP);
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}
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#endif
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static int run_in_fg(void)
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{
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pid_t val;
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/* this should work on every unix */
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if (!isatty(fileno(stdin)) || !isatty(fileno(stdout)))
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return 0;
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val = tcgetpgrp(fileno(stdin));
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if (val == -1) {
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if (errno == ENOTTY)
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return 0;
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else
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return 1;
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}
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if (val == getpgrp())
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return 1;
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else
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return 0;
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}
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/* if_fg_sane_tty():
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* restore tty modes, _only_ if running in foreground
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*/
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static void if_fg_sane_tty(void)
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{
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if (run_in_fg())
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sane_tty();
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}
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static void set_raw(int sig)
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{
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struct termios zap;
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#ifdef SIGTSTP
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signal(SIGTSTP, suspend);
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#endif
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#ifdef SIGCONT
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signal(SIGCONT, set_raw);
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#endif
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if (run_in_fg()) {
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tcgetattr(fileno(stdin), &zap);
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zap.c_cc[VMIN] = 0; /* can't work with old */
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zap.c_cc[VTIME] = 0; /* FreeBSD versions */
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zap.c_lflag &= ~(ICANON|ECHO|ECHONL);
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tcsetattr(fileno(stdin), TCSADRAIN, &zap);
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is_fg = TRUE;
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} else
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is_fg = FALSE;
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}
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/* nonblocking_io():
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* try to setup the keyboard to non blocking io
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*/
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void term_init(void)
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{
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if (!psanity) {
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psanity = &sanity;
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tcgetattr(fileno(stdin), psanity);
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}
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set_raw(0);
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atexit(if_fg_sane_tty);
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}
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/* sane_tty():
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* restores everything to a sane state before returning to shell */
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static void sane_tty(void)
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{
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tcsetattr(fileno(stdin), TCSADRAIN, psanity);
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}
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static int may_getchar(void)
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{
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char buffer;
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if (run_in_fg() && !is_fg)
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set_raw(0);
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if (run_in_fg() && read(fileno(stdin), &buffer, 1))
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return buffer;
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return 0;
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}
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void term_control(void)
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{
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int val = may_getchar();
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if (val == 'b' || val == 'B')
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rd->rewind(rd);
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}
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void term_restore(void)
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{
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}
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#endif
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