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537 lines
10 KiB
C
537 lines
10 KiB
C
/* slutty.c --- Unix Low level terminal (tty) functions for S-Lang */
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/* Copyright (c) 1992, 1995 John E. Davis
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* All rights reserved.
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Perl Artistic License.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <signal.h>
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/* sequent support thanks to Kenneth Lorber <keni@oasys.dt.navy.mil> */
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/* SYSV (SYSV ISC R3.2 v3.0) provided by iain.lea@erlm.siemens.de */
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#if defined (_AIX) && !defined (_ALL_SOURCE)
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# define _ALL_SOURCE /* so NBBY is defined in <sys/types.h> */
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#endif
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <sys/time.h>
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#include <sys/types.h>
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#ifdef SYSV
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# include <fcntl.h>
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# ifndef CRAY
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# include <sys/termio.h>
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# include <sys/stream.h>
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# include <sys/ptem.h>
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# include <sys/tty.h>
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# endif
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#endif
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#ifdef __BEOS__
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/* Prototype for select */
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# include <net/socket.h>
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#endif
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#include <sys/file.h>
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#ifndef sun
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# include <sys/ioctl.h>
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#endif
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#ifdef __QNX__
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# include <sys/select.h>
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#endif
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#include <sys/stat.h>
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#include <errno.h>
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#if defined (_AIX) && !defined (FD_SET)
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# include <sys/select.h> /* for FD_ISSET, FD_SET, FD_ZERO */
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#endif
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#ifndef O_RDWR
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# include <fcntl.h>
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#endif
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#include "slang.h"
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#include "_slang.h"
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int SLang_TT_Read_FD = -1;
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int SLang_TT_Baud_Rate;
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#ifdef HAVE_TERMIOS_H
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# if !defined(HAVE_TCGETATTR) || !defined(HAVE_TCSETATTR)
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# undef HAVE_TERMIOS_H
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# endif
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#endif
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#ifndef HAVE_TERMIOS_H
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# if !defined(CBREAK) && defined(sun)
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# ifndef BSD_COMP
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# define BSD_COMP 1
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# endif
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# include <sys/ioctl.h>
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# endif
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typedef struct
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{
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struct tchars t;
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struct ltchars lt;
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struct sgttyb s;
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}
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TTY_Termio_Type;
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#else
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# include <termios.h>
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typedef struct termios TTY_Termio_Type;
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#endif
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static TTY_Termio_Type Old_TTY;
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#ifdef HAVE_TERMIOS_H
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static struct
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{
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speed_t key;
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int value;
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} Baud_Rates[] =
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{
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{B0, 0},
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{B50, 50},
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{B75, 75},
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{B110, 110},
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{B134, 134},
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{B150, 150},
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{B200, 200},
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{B300, 300},
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{B600, 600},
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{B1200, 1200},
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{B1800, 1800},
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{B2400, 2400},
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{B4800, 4800},
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{B9600, 9600},
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{B19200, 19200},
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{B38400, 38400}
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#ifdef B57600
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, {B57600, 57600}
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#endif
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#ifdef B115200
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, {B115200, 115200}
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#endif
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#ifdef B230400
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, {B230400, 230400}
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#endif
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};
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#endif
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#ifdef HAVE_TERMIOS_H
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# define GET_TERMIOS(fd, x) tcgetattr(fd, x)
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# define SET_TERMIOS(fd, x) tcsetattr(fd, TCSADRAIN, x)
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#else
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# ifdef TCGETS
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# define GET_TERMIOS(fd, x) ioctl(fd, TCGETS, x)
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# define SET_TERMIOS(fd, x) ioctl(fd, TCSETS, x)
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# else
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# define X(x,m) &(((TTY_Termio_Type *)(x))->m)
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# define GET_TERMIOS(fd, x) \
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((ioctl(fd, TIOCGETC, X(x,t)) || \
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ioctl(fd, TIOCGLTC, X(x,lt)) || \
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ioctl(fd, TIOCGETP, X(x,s))) ? -1 : 0)
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# define SET_TERMIOS(fd, x) \
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((ioctl(fd, TIOCSETC, X(x,t)) ||\
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ioctl(fd, TIOCSLTC, X(x,lt)) || \
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ioctl(fd, TIOCSETP, X(x,s))) ? -1 : 0)
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# endif
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#endif
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static int TTY_Inited = 0;
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static int TTY_Open = 0;
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#ifdef ultrix /* Ultrix gets _POSIX_VDISABLE wrong! */
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# define NULL_VALUE -1
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#else
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# ifdef _POSIX_VDISABLE
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# define NULL_VALUE _POSIX_VDISABLE
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# else
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# define NULL_VALUE 255
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# endif
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#endif
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static int
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speed_t2baud_rate (speed_t s)
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{
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int i;
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for (i = 0; i < sizeof (Baud_Rates)/sizeof (Baud_Rates[0]); i++)
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if (Baud_Rates[i].key == s)
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return (Baud_Rates[i].value);
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return 0;
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}
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int SLang_init_tty (int abort_char, int no_flow_control, int opost)
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{
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TTY_Termio_Type newtty;
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SLsig_block_signals ();
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if (TTY_Inited)
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{
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SLsig_unblock_signals ();
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return 0;
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}
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TTY_Open = 0;
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if ((SLang_TT_Read_FD == -1)
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|| (1 != isatty (SLang_TT_Read_FD)))
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{
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#if 0
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#ifdef O_RDWR
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# ifndef __BEOS__ /* I have been told that BEOS will HANG if passed /dev/tty */
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if ((SLang_TT_Read_FD = open("/dev/tty", O_RDWR)) >= 0)
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{
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TTY_Open = 1;
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}
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# endif
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#endif
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#endif /* 0 */
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if (TTY_Open == 0)
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{
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#if 0
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/* In the Midnight Commander we bind stderr sometimes to a pipe. If we
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use stderr for terminal input and call SLang_getkey while stderr is
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bound to a pipe MC will hang completly in SLsys_input_pending.
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NOTE: There's an independent fix for this problem in src/slint.c for
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the case that the Midnight Commander is linked against a shared slang
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library compiled from different sources.
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*/
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SLang_TT_Read_FD = fileno (stderr);
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if (1 != isatty (SLang_TT_Read_FD))
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#endif
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{
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SLang_TT_Read_FD = fileno (stdin);
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if (1 != isatty (SLang_TT_Read_FD))
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{
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fprintf (stderr, "Failed to open terminal.");
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return -1;
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}
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}
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}
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}
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SLang_Abort_Char = abort_char;
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/* Some systems may not permit signals to be blocked. As a result, the
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* return code must be checked.
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*/
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while (-1 == GET_TERMIOS(SLang_TT_Read_FD, &Old_TTY))
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{
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if (errno != EINTR)
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{
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SLsig_unblock_signals ();
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return -1;
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}
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}
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while (-1 == GET_TERMIOS(SLang_TT_Read_FD, &newtty))
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{
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if (errno != EINTR)
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{
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SLsig_unblock_signals ();
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return -1;
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}
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}
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#ifndef HAVE_TERMIOS_H
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newtty.s.sg_flags &= ~(ECHO);
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newtty.s.sg_flags &= ~(CRMOD);
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/* if (Flow_Control == 0) newtty.s.sg_flags &= ~IXON; */
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newtty.t.t_eofc = 1;
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if (abort_char == -1) SLang_Abort_Char = newtty.t.t_intrc;
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newtty.t.t_intrc = SLang_Abort_Char; /* ^G */
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newtty.t.t_quitc = 255;
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newtty.lt.t_suspc = 255; /* to ignore ^Z */
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newtty.lt.t_dsuspc = 255; /* to ignore ^Y */
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newtty.lt.t_lnextc = 255;
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newtty.s.sg_flags |= CBREAK; /* do I want cbreak or raw????? */
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#else
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/* get baud rate */
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/* [not only QNX related !?!]
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* ECHO(0x08) is a c_lflag bit, it means here PARMRK(0x08) in c_iflag!!!
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*/
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/*newtty.c_iflag &= ~(ECHO | INLCR | ICRNL);*/
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newtty.c_iflag &= ~(INLCR | ICRNL);
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#ifdef ISTRIP
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/* newtty.c_iflag &= ~ISTRIP; */
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#endif
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if (opost == 0) newtty.c_oflag &= ~OPOST;
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if (SLang_TT_Baud_Rate == 0)
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{
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/* Note: if this generates an compiler error, simply remove
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the statement */
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#ifdef HAVE_CFGETOSPEED
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SLang_TT_Baud_Rate = cfgetospeed (&newtty);
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#endif
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SLang_TT_Baud_Rate = speed_t2baud_rate (SLang_TT_Baud_Rate);
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}
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if (no_flow_control) newtty.c_iflag &= ~IXON; else newtty.c_iflag |= IXON;
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newtty.c_cc[VMIN] = 1;
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newtty.c_cc[VTIME] = 0;
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newtty.c_cc[VEOF] = 1;
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newtty.c_lflag = ISIG | NOFLSH;
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if (abort_char == -1) SLang_Abort_Char = newtty.c_cc[VINTR];
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newtty.c_cc[VINTR] = SLang_Abort_Char; /* ^G */
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newtty.c_cc[VQUIT] = NULL_VALUE;
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newtty.c_cc[VSUSP] = NULL_VALUE; /* to ignore ^Z */
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#ifdef VSWTCH
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newtty.c_cc[VSWTCH] = NULL_VALUE; /* to ignore who knows what */
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#endif
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#endif /* NOT HAVE_TERMIOS_H */
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while (-1 == SET_TERMIOS(SLang_TT_Read_FD, &newtty))
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{
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if (errno != EINTR)
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{
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SLsig_unblock_signals ();
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return -1;
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}
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}
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TTY_Inited = 1;
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SLsig_unblock_signals ();
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return 0;
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}
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void SLtty_set_suspend_state (int mode)
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{
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TTY_Termio_Type newtty;
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SLsig_block_signals ();
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if (TTY_Inited == 0)
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{
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SLsig_unblock_signals ();
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return;
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}
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while ((-1 == GET_TERMIOS (SLang_TT_Read_FD, &newtty))
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&& (errno == EINTR))
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;
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#ifndef HAVE_TERMIOS_H
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if (mode == 0) newtty.lt.t_suspc = 255;
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else newtty.lt.t_suspc = Old_TTY.lt.t_suspc;
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#else
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if (mode == 0) newtty.c_cc[VSUSP] = NULL_VALUE;
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else newtty.c_cc[VSUSP] = Old_TTY.c_cc[VSUSP];
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#endif
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while ((-1 == SET_TERMIOS (SLang_TT_Read_FD, &newtty))
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&& (errno == EINTR))
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;
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SLsig_unblock_signals ();
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}
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void SLang_reset_tty (void)
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{
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SLsig_block_signals ();
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if (TTY_Inited == 0)
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{
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SLsig_unblock_signals ();
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return;
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}
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while ((-1 == SET_TERMIOS(SLang_TT_Read_FD, &Old_TTY))
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&& (errno == EINTR))
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;
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if (TTY_Open)
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{
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while ((-1 == close (SLang_TT_Read_FD))
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&& (errno == EINTR))
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;
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TTY_Open = 0;
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SLang_TT_Read_FD = -1;
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}
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TTY_Inited = 0;
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SLsig_unblock_signals ();
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}
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static void default_sigint (int sig)
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{
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sig = errno; /* use parameter */
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SLKeyBoard_Quit = 1;
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if (SLang_Ignore_User_Abort == 0) SLang_Error = USER_BREAK;
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SLsignal_intr (SIGINT, default_sigint);
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errno = sig;
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}
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void SLang_set_abort_signal (void (*hand)(int))
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{
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int save_errno = errno;
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if (hand == NULL) hand = default_sigint;
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SLsignal_intr (SIGINT, hand);
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errno = save_errno;
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}
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#ifndef FD_SET
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#define FD_SET(fd, tthis) *(tthis) = 1 << (fd)
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#define FD_ZERO(tthis) *(tthis) = 0
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#define FD_ISSET(fd, tthis) (*(tthis) & (1 << fd))
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typedef int fd_set;
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#endif
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static fd_set Read_FD_Set;
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/* HACK: If > 0, use 1/10 seconds. If < 0, use 1/1000 seconds */
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int SLsys_input_pending(int tsecs)
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{
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struct timeval wait;
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long usecs, secs;
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if (TTY_Inited == 0) return -1;
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if (tsecs >= 0)
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{
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secs = tsecs / 10;
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usecs = (tsecs % 10) * 100000;
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}
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else
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{
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tsecs = -tsecs;
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secs = tsecs / 1000;
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usecs = (tsecs % 1000) * 1000;
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}
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wait.tv_sec = secs;
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wait.tv_usec = usecs;
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FD_ZERO(&Read_FD_Set);
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FD_SET(SLang_TT_Read_FD, &Read_FD_Set);
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return select(SLang_TT_Read_FD + 1, &Read_FD_Set, NULL, NULL, &wait);
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}
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int (*SLang_getkey_intr_hook) (void);
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static int handle_interrupt (void)
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{
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if (SLang_getkey_intr_hook != NULL)
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{
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int save_tty_fd = SLang_TT_Read_FD;
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if (-1 == (*SLang_getkey_intr_hook) ())
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return -1;
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if (save_tty_fd != SLang_TT_Read_FD)
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return -1;
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}
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return 0;
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}
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unsigned int SLsys_getkey (void)
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{
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unsigned char c;
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if (TTY_Inited == 0)
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{
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int ic = fgetc (stdin);
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if (ic == EOF) return SLANG_GETKEY_ERROR;
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return (unsigned int) ic;
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}
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while (1)
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{
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int ret;
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if (SLKeyBoard_Quit)
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return SLang_Abort_Char;
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if (0 == (ret = SLsys_input_pending (100)))
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continue;
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if (ret != -1)
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break;
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if (SLKeyBoard_Quit)
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return SLang_Abort_Char;
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if (errno == EINTR)
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{
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if (-1 == handle_interrupt ())
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return SLANG_GETKEY_ERROR;
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continue;
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}
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break; /* let read handle it */
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}
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while (-1 == read(SLang_TT_Read_FD, (char *) &c, 1))
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{
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if (errno == EINTR)
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{
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if (-1 == handle_interrupt ())
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return SLANG_GETKEY_ERROR;
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if (SLKeyBoard_Quit)
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return SLang_Abort_Char;
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continue;
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}
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#ifdef EAGAIN
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if (errno == EAGAIN)
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{
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sleep (1);
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continue;
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}
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#endif
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#ifdef EWOULDBLOCK
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if (errno == EWOULDBLOCK)
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{
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sleep (1);
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continue;
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}
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#endif
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#ifdef EIO
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if (errno == EIO)
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{
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SLang_exit_error ("SLsys_getkey: EIO error.");
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}
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#endif
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return SLANG_GETKEY_ERROR;
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}
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return((unsigned int) c);
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}
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