Annotation of gforth/engine/io.c, revision 1.32

1.10      anton       1: /* direct key io driver
1.1       anton       2: 
1.31      anton       3:   Copyright (C) 1995,1996,1997,1998,1999,2002,2003,2006,2007 Free Software Foundation, Inc.
1.1       anton       4: 
                      5:   This file is part of Gforth.
                      6: 
                      7:   Gforth is free software; you can redistribute it and/or
                      8:   modify it under the terms of the GNU General Public License
1.32    ! anton       9:   as published by the Free Software Foundation, either version 3
1.1       anton      10:   of the License, or (at your option) any later version.
                     11: 
                     12:   This program is distributed in the hope that it will be useful,
                     13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15:   GNU General Public License for more details.
                     16: 
                     17:   You should have received a copy of the GNU General Public License
1.32    ! anton      18:   along with this program; if not, see http://www.gnu.org/licenses/.
1.1       anton      19: 
                     20:   The following is stolen from the readline library for bash
                     21: */
                     22: 
                     23: /*
                     24:    Use -D_POSIX_VERSION for POSIX systems.
                     25: */
                     26: 
                     27: #include "config.h"
1.15      anton      28: #include "forth.h"
1.7       pazsan     29: #include <sys/time.h>
                     30: #include <sys/types.h>
1.1       anton      31: #include <unistd.h>
                     32: 
                     33: #if defined(apollo) || defined(_WIN32)
                     34: #define _POSIX_VERSION
                     35: #endif
                     36: 
1.6       pazsan     37: #if !defined(Solaris) && defined(sun) && defined(__svr4__)
                     38: #define Solaris
                     39: typedef unsigned int uint32_t;
                     40: #endif
                     41: 
1.1       anton      42: #include <stdio.h>
                     43: #include <signal.h>
                     44: #include <string.h>
                     45: #if !defined(apollo) && !defined(MSDOS)
                     46: #include <sys/ioctl.h>
                     47: #endif
                     48: #include <fcntl.h>
                     49: #include <sys/file.h>
                     50: #if defined(Solaris) && !defined(FIONREAD)
                     51: #include <sys/filio.h>
                     52: #endif
                     53: #include <setjmp.h>
                     54: #include "io.h"
                     55: 
                     56: #ifndef MSDOS
                     57: #if defined (__GNUC__)
                     58: #  define alloca __builtin_alloca
                     59: #else
                     60: #  if defined (sparc) || defined (HAVE_ALLOCA_H)
                     61: #    include <alloca.h>
                     62: #  endif
                     63: #endif
                     64: 
                     65: #define NEW_TTY_DRIVER
                     66: #define HAVE_BSD_SIGNALS
                     67: /*
                     68: #ifndef apollo
                     69: #define USE_XON_XOFF
                     70: #endif
                     71: */
                     72: 
                     73: #define HANDLE_SIGNALS
                     74: 
                     75: /* Some USG machines have BSD signal handling (sigblock, sigsetmask, etc.) */
                     76: #if defined (USG) && !defined (hpux)
                     77: #undef HAVE_BSD_SIGNALS
                     78: #endif
                     79: 
                     80: /* System V machines use termio. */
                     81: #if !defined (_POSIX_VERSION)
                     82: #  if defined (USG) || defined (hpux) || defined (Xenix) || defined (sgi) || defined (DGUX) || defined (ultrix) || defined (Solaris) || defined(_WIN32)
                     83: #    undef NEW_TTY_DRIVER
                     84: #    define TERMIO_TTY_DRIVER
                     85: #    include <termio.h>
                     86: #    if !defined (TCOON)
                     87: #      define TCOON 1
                     88: #    endif
                     89: #  endif /* USG || hpux || Xenix || sgi || DUGX || ultrix*/
                     90: #endif /* !_POSIX_VERSION */
                     91: 
                     92: /* Posix systems use termios and the Posix signal functions. */
1.5       pazsan     93: #if defined (_POSIX_VERSION) || defined (NeXT)
1.1       anton      94: #  if !defined (TERMIOS_MISSING)
                     95: #    undef NEW_TTY_DRIVER
                     96: #    define TERMIOS_TTY_DRIVER
                     97: #    include <termios.h>
                     98: #  endif /* !TERMIOS_MISSING */
1.5       pazsan     99: #endif /* _POSIX_VERSION || NeXT */
                    100: 
                    101: #if defined (_POSIX_VERSION)
1.1       anton     102: #  define HAVE_POSIX_SIGNALS
                    103: #  if !defined (O_NDELAY)
                    104: #    define O_NDELAY O_NONBLOCK        /* Posix-style non-blocking i/o */
                    105: #  endif /* O_NDELAY */
                    106: #endif /* _POSIX_VERSION */
                    107: 
                    108: /* Other (BSD) machines use sgtty. */
                    109: #if defined (NEW_TTY_DRIVER)
                    110: #include <sgtty.h>
                    111: #endif
                    112: 
                    113: /* Define _POSIX_VDISABLE if we are not using the `new' tty driver and
                    114:    it is not already defined.  It is used both to determine if a
                    115:    special character is disabled and to disable certain special
                    116:    characters.  Posix systems should set to 0, USG systems to -1. */
                    117: #if !defined (NEW_TTY_DRIVER) && !defined (_POSIX_VDISABLE)
1.5       pazsan    118: #  if defined (_POSIX_VERSION) || defined (NeXT)
1.1       anton     119: #    define _POSIX_VDISABLE 0
                    120: #  else /* !_POSIX_VERSION */
                    121: #    define _POSIX_VDISABLE -1
                    122: #  endif /* !_POSIX_VERSION */
                    123: #endif /* !NEW_TTY_DRIVER && !_POSIX_VDISABLE */
                    124: 
                    125: #include <errno.h>
                    126: /* extern int errno; */
                    127: 
                    128: #if defined (SHELL)
                    129: #  include <posixstat.h>
                    130: #else
                    131: #  include <sys/stat.h>
                    132: #endif /* !SHELL */
                    133: /* #define HACK_TERMCAP_MOTION */
                    134: 
                    135: #if defined (USG) && defined (hpux)
                    136: #  if !defined (USGr3)
                    137: #    define USGr3
                    138: #  endif /* USGr3 */
                    139: #endif /* USG && hpux */
                    140: 
                    141: #if (defined (_POSIX_VERSION) || defined (USGr3)) && !defined(apollo)
                    142: #  include <dirent.h>
                    143: #  define direct dirent
                    144: #  if defined (_POSIX_VERSION)
                    145: #    define D_NAMLEN(d) (strlen ((d)->d_name))
                    146: #  else /* !_POSIX_VERSION */
                    147: #    define D_NAMLEN(d) ((d)->d_reclen)
                    148: #  endif /* !_POSIX_VERSION */
                    149: #else /* !_POSIX_VERSION && !USGr3 */
                    150: #  define D_NAMLEN(d) ((d)->d_namlen)
                    151: #  if !defined (USG)
                    152: #    include <sys/dir.h>
                    153: #  else /* USG */
                    154: #    if defined (Xenix)
                    155: #      include <sys/ndir.h>
                    156: #    else /* !Xenix */
                    157: #      include <ndir.h>
                    158: #    endif /* !Xenix */
                    159: #  endif /* USG */
                    160: #endif /* !POSIX_VERSION && !USGr3 */
                    161: 
                    162: #if defined (USG) && defined (TIOCGWINSZ)
                    163: #  include <sys/stream.h>
                    164: #  if defined (USGr4) || defined (USGr3)
                    165: #    if defined (Symmetry) || defined (_SEQUENT_)
                    166: #      include <sys/pte.h>
                    167: #    else
                    168: #      include <sys/ptem.h>
                    169: #    endif /* !Symmetry || _SEQUENT_ */
                    170: #  endif /* USGr4 */
                    171: #endif /* USG && TIOCGWINSZ */
                    172: 
                    173: #if defined (TERMIOS_TTY_DRIVER)
                    174: static struct termios otio;
                    175: #else
                    176: static struct termio otio;
                    177: #endif /* !TERMIOS_TTY_DRIVER */
                    178: 
                    179: /* Non-zero means echo characters as they are read. */
                    180: int readline_echoing_p = 1;
                    181: 
                    182: /* The character that can generate an EOF.  Really read from
                    183:    the terminal driver... just defaulted here. */
                    184: 
                    185: #ifndef CTRL
                    186: #define CTRL(key)      ((key)-'@')
                    187: #endif
                    188: 
                    189: static int eof_char = CTRL ('D');
                    190: 
                    191: /* **************************************************************** */
                    192: /*                                                                 */
                    193: /*                   Saving and Restoring the TTY                  */
                    194: /*                                                                 */
                    195: /* **************************************************************** */
                    196: 
                    197: /* Non-zero means that the terminal is in a prepped state. */
                    198: int terminal_prepped = 0;
                    199: 
                    200: #if defined (NEW_TTY_DRIVER)
                    201: 
                    202: /* Standard flags, including ECHO. */
                    203: static int original_tty_flags = 0;
                    204: 
                    205: /* Local mode flags, like LPASS8. */
                    206: static int local_mode_flags = 0;
                    207: 
                    208: /* Terminal characters.  This has C-s and C-q in it. */
                    209: static struct tchars original_tchars;
                    210: 
                    211: /* Local special characters.  This has the interrupt characters in it. */
                    212: #if defined (TIOCGLTC)
                    213: static struct ltchars original_ltchars;
                    214: #endif
                    215: 
                    216: /* Bind KEY to FUNCTION.  Returns non-zero if KEY is out of range. */
                    217: 
                    218: #if defined (TIOCGETC)
                    219: #if defined (USE_XON_XOFF)
                    220: 
                    221: int
                    222: bind_key (key, function)
                    223:      int key;
                    224:      Function *function;
                    225: {
                    226:   if (key < 0)
                    227:     return (key);
                    228: 
                    229:   if (key > 127 && key < 256)
                    230:     {
                    231:       if (keymap[ESC].type == ISKMAP)
                    232:        {
                    233:          Keymap escmap = (Keymap)keymap[ESC].function;
                    234: 
                    235:          key -= 128;
                    236:          escmap[key].type = ISFUNC;
                    237:          escmap[key].function = function;
                    238:          return (0);
                    239:        }
                    240:       return (key);
                    241:     }
                    242: 
                    243:   keymap[key].type = ISFUNC;
                    244:   keymap[key].function = function;
                    245:  return (0);
                    246: }
                    247: #endif
                    248: #endif
                    249: 
                    250: /* We use this to get and set the tty_flags. */
                    251: static struct sgttyb the_ttybuff;
                    252: 
                    253: #if defined (USE_XON_XOFF)
                    254: /* If the terminal was in xoff state when we got to it, then xon_char
                    255:    contains the character that is supposed to start it again. */
                    256: static int xon_char, xoff_state;
                    257: #endif /* USE_XON_XOFF */
                    258: 
                    259: /* **************************************************************** */
                    260: /*                                                                 */
                    261: /*                     Bogus Flow Control                          */
                    262: /*                                                                 */
                    263: /* **************************************************************** */
                    264: 
                    265: restart_output (count, key)
                    266:      int count, key;
                    267: {
                    268:   int fildes = fileno (stdin);
                    269: #if defined (TIOCSTART)
                    270: #if defined (apollo)
                    271:   ioctl (&fildes, TIOCSTART, 0);
                    272: #else
                    273:   ioctl (fildes, TIOCSTART, 0);
                    274: #endif /* apollo */
                    275: 
                    276: #else
                    277: #  if defined (TERMIOS_TTY_DRIVER)
                    278:         tcflow (fildes, TCOON);
                    279: #  else
                    280: #    if defined (TCXONC)
                    281:         ioctl (fildes, TCXONC, TCOON);
                    282: #    endif /* TCXONC */
                    283: #  endif /* !TERMIOS_TTY_DRIVER */
                    284: #endif /* TIOCSTART */
                    285: }
                    286: 
                    287: /* Put the terminal in CBREAK mode so that we can detect key presses. */
                    288: void prep_terminal ()
                    289: {
                    290:   int tty = fileno (stdin);
                    291: #if defined (HAVE_BSD_SIGNALS)
                    292:   int oldmask;
                    293: #endif /* HAVE_BSD_SIGNALS */
                    294: 
                    295:   if (terminal_prepped)
                    296:     return;
                    297: 
                    298:   if (!isatty(tty)) {      /* added by MdG */
                    299:     terminal_prepped = 1;      /* added by MdG */
                    300:     return;      /* added by MdG */
                    301:   }      /* added by MdG */
                    302:    
                    303:   oldmask = sigblock (sigmask (SIGINT));
                    304: 
                    305:   /* We always get the latest tty values.  Maybe stty changed them. */
                    306:   ioctl (tty, TIOCGETP, &the_ttybuff);
                    307:   original_tty_flags = the_ttybuff.sg_flags;
                    308: 
                    309:   readline_echoing_p = (original_tty_flags & ECHO);
                    310: 
                    311: #if defined (TIOCLGET)
                    312:   ioctl (tty, TIOCLGET, &local_mode_flags);
                    313: #endif
                    314: 
                    315: #if !defined (ANYP)
                    316: #  define ANYP (EVENP | ODDP)
                    317: #endif
                    318: 
                    319:   /* If this terminal doesn't care how the 8th bit is used,
                    320:      then we can use it for the meta-key.  We check by seeing
                    321:      if BOTH odd and even parity are allowed. */
                    322:   if (the_ttybuff.sg_flags & ANYP)
                    323:     {
                    324: #if defined (PASS8)
                    325:       the_ttybuff.sg_flags |= PASS8;
                    326: #endif
                    327: 
                    328:       /* Hack on local mode flags if we can. */
                    329: #if defined (TIOCLGET) && defined (LPASS8)
                    330:       {
                    331:        int flags;
                    332:        flags = local_mode_flags | LPASS8;
                    333:        ioctl (tty, TIOCLSET, &flags);
                    334:       }
                    335: #endif /* TIOCLGET && LPASS8 */
                    336:     }
                    337: 
                    338: #if defined (TIOCGETC)
                    339:   {
                    340:     struct tchars temp;
                    341: 
                    342:     ioctl (tty, TIOCGETC, &original_tchars);
                    343:     temp = original_tchars;
                    344: 
                    345: #if defined (USE_XON_XOFF)
                    346:     /* Get rid of C-s and C-q.
                    347:        We remember the value of startc (C-q) so that if the terminal is in
                    348:        xoff state, the user can xon it by pressing that character. */
                    349:     xon_char = temp.t_startc;
                    350:     temp.t_stopc = -1;
                    351:     temp.t_startc = -1;
                    352: 
                    353:     /* If there is an XON character, bind it to restart the output. */
                    354:     if (xon_char != -1)
                    355:       bind_key (xon_char, restart_output);
                    356: #endif /* USE_XON_XOFF */
                    357: 
                    358:     /* If there is an EOF char, bind eof_char to it. */
                    359:     if (temp.t_eofc != -1)
                    360:       eof_char = temp.t_eofc;
                    361: 
                    362: #if defined (NO_KILL_INTR)
                    363:     /* Get rid of C-\ and C-c. */
                    364:     temp.t_intrc = temp.t_quitc = -1;
                    365: #endif /* NO_KILL_INTR */
                    366: 
                    367:     ioctl (tty, TIOCSETC, &temp);
                    368:   }
                    369: #endif /* TIOCGETC */
                    370: 
                    371: #if defined (TIOCGLTC)
                    372:   {
                    373:     struct ltchars temp;
                    374: 
                    375:     ioctl (tty, TIOCGLTC, &original_ltchars);
                    376:     temp = original_ltchars;
                    377: 
                    378:     /* Make the interrupt keys go away.  Just enough to make people
                    379:        happy. */
                    380:     temp.t_dsuspc = -1;        /* C-y */
                    381:     temp.t_lnextc = -1;        /* C-v */
                    382: 
                    383:     ioctl (tty, TIOCSLTC, &temp);
                    384:   }
                    385: #endif /* TIOCGLTC */
                    386: 
                    387:   the_ttybuff.sg_flags &= ~(ECHO | CRMOD);
                    388:   the_ttybuff.sg_flags |= CBREAK;
                    389:   ioctl (tty, TIOCSETN, &the_ttybuff);
                    390: 
                    391:   terminal_prepped = 1;
                    392: 
                    393: #if defined (HAVE_BSD_SIGNALS)
                    394:   sigsetmask (oldmask);
                    395: #endif
                    396: }
                    397: 
                    398: /* Restore the terminal to its original state. */
                    399: void deprep_terminal ()
                    400: {
                    401:   int tty = fileno (stdin);
                    402: #if defined (HAVE_BSD_SIGNALS)
                    403:   int oldmask;
                    404: #endif
                    405: 
                    406:   if (!terminal_prepped)
                    407:     return;
                    408: 
                    409: /* Added by MdG */
                    410:   if (!isatty(tty)) {
                    411:     terminal_prepped = 0;
                    412:     return;
                    413:   }
                    414:    
                    415:   oldmask = sigblock (sigmask (SIGINT));
                    416: 
                    417:   the_ttybuff.sg_flags = original_tty_flags;
                    418:   ioctl (tty, TIOCSETN, &the_ttybuff);
                    419:   readline_echoing_p = 1;
                    420: 
                    421: #if defined (TIOCLGET)
                    422:   ioctl (tty, TIOCLSET, &local_mode_flags);
                    423: #endif
                    424: 
                    425: #if defined (TIOCSLTC)
                    426:   ioctl (tty, TIOCSLTC, &original_ltchars);
                    427: #endif
                    428: 
                    429: #if defined (TIOCSETC)
                    430:   ioctl (tty, TIOCSETC, &original_tchars);
                    431: #endif
                    432:   terminal_prepped = 0;
                    433: 
                    434: #if defined (HAVE_BSD_SIGNALS)
                    435:   sigsetmask (oldmask);
                    436: #endif
                    437: }
                    438: 
                    439: #else  /* !defined (NEW_TTY_DRIVER) */
                    440: 
                    441: #if !defined (VMIN)
                    442: #define VMIN VEOF
                    443: #endif
                    444: 
                    445: #if !defined (VTIME)
                    446: #define VTIME VEOL
                    447: #endif
                    448: 
1.18      pazsan    449: #include <locale.h>
                    450: 
1.1       anton     451: void prep_terminal ()
                    452: {
                    453:   int tty = fileno (stdin);
                    454: #if defined (TERMIOS_TTY_DRIVER)
                    455:   struct termios tio;
                    456: #else
                    457:   struct termio tio;
                    458: #endif /* !TERMIOS_TTY_DRIVER */
                    459: 
                    460: #if defined (HAVE_POSIX_SIGNALS)
                    461:   sigset_t set, oset;
                    462: #else
                    463: #  if defined (HAVE_BSD_SIGNALS)
                    464:   int oldmask;
                    465: #  endif /* HAVE_BSD_SIGNALS */
                    466: #endif /* !HAVE_POSIX_SIGNALS */
                    467: 
                    468:   if (terminal_prepped)
                    469:     return;
                    470: 
                    471:   if (!isatty(tty))  {     /* added by MdG */
                    472:     terminal_prepped = 1;      /* added by MdG */
                    473:     return;      /* added by MdG */
                    474:   }      /* added by MdG */
                    475:    
1.18      pazsan    476:   setlocale(LC_ALL, "");
1.24      pazsan    477:   setlocale(LC_NUMERIC, "C");
1.18      pazsan    478: 
1.1       anton     479:   /* Try to keep this function from being INTerrupted.  We can do it
                    480:      on POSIX and systems with BSD-like signal handling. */
                    481: #if defined (HAVE_POSIX_SIGNALS)
                    482:   sigemptyset (&set);
                    483:   sigemptyset (&oset);
                    484:   sigaddset (&set, SIGINT);
                    485:   sigprocmask (SIG_BLOCK, &set, &oset);
                    486: #else /* !HAVE_POSIX_SIGNALS */
                    487: #  if defined (HAVE_BSD_SIGNALS)
                    488:   oldmask = sigblock (sigmask (SIGINT));
                    489: #  endif /* HAVE_BSD_SIGNALS */
                    490: #endif /* !HAVE_POSIX_SIGNALS */
                    491: 
                    492: #if defined (TERMIOS_TTY_DRIVER)
                    493:   tcgetattr (tty, &tio);
                    494: #else
                    495:   ioctl (tty, TCGETA, &tio);
                    496: #endif /* !TERMIOS_TTY_DRIVER */
                    497: 
                    498:   otio = tio;
                    499: 
                    500:   readline_echoing_p = (tio.c_lflag & ECHO);
                    501: 
                    502:   tio.c_lflag &= ~(ICANON | ECHO);
                    503: 
                    504:   if (otio.c_cc[VEOF] != _POSIX_VDISABLE)
                    505:     eof_char = otio.c_cc[VEOF];
                    506: 
                    507: #if defined (USE_XON_XOFF)
                    508: #if defined (IXANY)
                    509:   tio.c_iflag &= ~(IXON | IXOFF | IXANY);
                    510: #else
                    511:   /* `strict' Posix systems do not define IXANY. */
                    512:   tio.c_iflag &= ~(IXON | IXOFF);
                    513: #endif /* IXANY */
                    514: #endif /* USE_XON_XOFF */
                    515: 
                    516:   /* Only turn this off if we are using all 8 bits. */
                    517:   if ((tio.c_cflag & CSIZE) == CS8)
                    518:     tio.c_iflag &= ~(ISTRIP | INPCK);
                    519: 
                    520:   /* Make sure we differentiate between CR and NL on input. */
                    521:   tio.c_iflag &= ~(ICRNL | INLCR);
                    522: 
                    523: #if !defined (HANDLE_SIGNALS)
                    524:   tio.c_lflag &= ~ISIG;
                    525: #else
                    526:   tio.c_lflag |= ISIG;
                    527: #endif
                    528: 
                    529:   tio.c_cc[VMIN] = 1;
                    530:   tio.c_cc[VTIME] = 0;
                    531: 
                    532:   /* Turn off characters that we need on Posix systems with job control,
                    533:      just to be sure.  This includes ^Y and ^V.  This should not really
                    534:      be necessary.  */
                    535: #if defined (TERMIOS_TTY_DRIVER) && defined (_POSIX_JOB_CONTROL)
                    536: 
                    537: #if defined (VLNEXT)
                    538:   tio.c_cc[VLNEXT] = _POSIX_VDISABLE;
                    539: #endif
                    540: 
                    541: #if defined (VDSUSP)
                    542:   tio.c_cc[VDSUSP] = _POSIX_VDISABLE;
                    543: #endif
                    544: 
                    545: #endif /* POSIX && JOB_CONTROL */
                    546: 
                    547: #if defined (TERMIOS_TTY_DRIVER)
                    548:   tcsetattr (tty, TCSADRAIN, &tio);
                    549:   tcflow (tty, TCOON);         /* Simulate a ^Q. */
                    550: #else
                    551:   ioctl (tty, TCSETAW, &tio);
                    552:   ioctl (tty, TCXONC, 1);      /* Simulate a ^Q. */
                    553: #endif /* !TERMIOS_TTY_DRIVER */
                    554: 
                    555:   terminal_prepped = 1;
                    556: 
                    557: #if defined (HAVE_POSIX_SIGNALS)
                    558:   sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
                    559: #else
                    560: #  if defined (HAVE_BSD_SIGNALS)
                    561:   sigsetmask (oldmask);
                    562: #  endif /* HAVE_BSD_SIGNALS */
                    563: #endif /* !HAVE_POSIX_SIGNALS */
                    564: }
                    565: 
                    566: void deprep_terminal ()
                    567: {
                    568:   int tty = fileno (stdin);
                    569: 
                    570:   /* Try to keep this function from being INTerrupted.  We can do it
                    571:      on POSIX and systems with BSD-like signal handling. */
                    572: #if defined (HAVE_POSIX_SIGNALS)
                    573:   sigset_t set, oset;
                    574: #else /* !HAVE_POSIX_SIGNALS */
                    575: #  if defined (HAVE_BSD_SIGNALS)
                    576:   int oldmask;
                    577: #  endif /* HAVE_BSD_SIGNALS */
                    578: #endif /* !HAVE_POSIX_SIGNALS */
                    579: 
                    580:   if (!terminal_prepped)
                    581:     return;
                    582: 
                    583: /* Added by MdG */
                    584:   if (!isatty(tty)) {
                    585:     terminal_prepped = 0;
                    586:     return;
                    587:   }
                    588: 
                    589: #if defined (HAVE_POSIX_SIGNALS)
                    590:   sigemptyset (&set);
                    591:   sigemptyset (&oset);
                    592:   sigaddset (&set, SIGINT);
                    593:   sigprocmask (SIG_BLOCK, &set, &oset);
                    594: #else /* !HAVE_POSIX_SIGNALS */
                    595: #  if defined (HAVE_BSD_SIGNALS)
                    596:   oldmask = sigblock (sigmask (SIGINT));
                    597: #  endif /* HAVE_BSD_SIGNALS */
                    598: #endif /* !HAVE_POSIX_SIGNALS */
                    599: 
                    600: #if defined (TERMIOS_TTY_DRIVER)
                    601:   tcsetattr (tty, TCSADRAIN, &otio);
                    602:   tcflow (tty, TCOON);         /* Simulate a ^Q. */
                    603: #else /* TERMIOS_TTY_DRIVER */
                    604:   ioctl (tty, TCSETAW, &otio);
                    605:   ioctl (tty, TCXONC, 1);      /* Simulate a ^Q. */
                    606: #endif /* !TERMIOS_TTY_DRIVER */
                    607: 
                    608:   terminal_prepped = 0;
                    609: 
                    610: #if defined (HAVE_POSIX_SIGNALS)
                    611:   sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
                    612: #else /* !HAVE_POSIX_SIGNALS */
                    613: #  if defined (HAVE_BSD_SIGNALS)
                    614:   sigsetmask (oldmask);
                    615: #  endif /* HAVE_BSD_SIGNALS */
                    616: #endif /* !HAVE_POSIX_SIGNALS */
                    617: }
                    618: #endif  /* NEW_TTY_DRIVER */
                    619: 
1.7       pazsan    620: long key_avail (FILE * stream)
1.1       anton     621: {
                    622:   int tty = fileno (stream);
1.21      anton     623:   fd_set selin;
1.28      pazsan    624:   static struct timespec now = { 0 , 0 };
1.21      anton     625:   int res;
1.1       anton     626: 
1.22      anton     627:   setvbuf(stream, NULL, _IONBF, 0);
1.20      anton     628:   if(!terminal_prepped && stream == stdin)
                    629:     prep_terminal();
1.1       anton     630: 
1.21      anton     631:   FD_ZERO(&selin);
                    632:   FD_SET(tty, &selin);
1.28      pazsan    633:   return select(1, &selin, NULL, NULL, &now);
1.1       anton     634: }
                    635: 
                    636: /* Get a key from the buffer of characters to be read.
                    637:    Return the key in KEY.
                    638:    Result is KEY if there was a key, or 0 if there wasn't. */
                    639: 
                    640: /* When compiling and running in the `Posix' environment, Ultrix does
                    641:    not restart system calls, so this needs to do it. */
                    642: 
1.11      anton     643: Cell getkey(FILE * stream)
1.1       anton     644: {
1.11      anton     645:   Cell result;
1.1       anton     646:   unsigned char c;
                    647: 
1.23      anton     648:   setvbuf(stream, NULL, _IONBF, 0);
1.22      anton     649:   if(!terminal_prepped && stream == stdin)
1.11      anton     650:     prep_terminal();
1.1       anton     651: 
1.22      anton     652:   result = fread(&c, sizeof(c), 1, stream);
1.30      pazsan    653:   return result==0 ? (errno == EINTR ? 12 : 4) : c;
1.1       anton     654: }
                    655: 
1.26      pazsan    656: #ifdef STANDALONE
                    657: void emit_char(char x)
                    658: {
                    659:   putc(x, stdout);
                    660: }
                    661: 
                    662: void type_chars(char *addr, unsigned int l)
                    663: {
                    664:   fwrite(addr, l, 1, stdout);
                    665: }
                    666: #endif
                    667: 
1.1       anton     668: #ifdef TEST
                    669: 
                    670: #include <time.h>
                    671: 
                    672: int timewait=100000;
                    673: 
                    674: int main()
                    675: {
                    676:        unsigned char c;
                    677: 
                    678:        prep_terminal();
                    679: 
                    680:        do
                    681:        {
                    682:                int i=0;
                    683: 
                    684:                while(!key_avail(stdin))
                    685:                {
                    686:                        printf("%04d",i);
                    687:                        fflush(stdout);
                    688:                        {
                    689:                                struct timeval timeout;
                    690:                                timeout.tv_sec=timewait/1000000;
                    691:                                timeout.tv_usec=timewait%1000000;
                    692:                                (void)select(0,0,0,0,&timeout);
                    693:                        }
                    694:                        i++;
                    695:                        printf("\b\b\b\b");
                    696:                        fflush(stdout);
                    697:                }
                    698:                c = getkey(stdin);
                    699:                printf("%02x,",(int)c);
                    700:                fflush(stdout);
                    701:        }       while(c != 0x1B);
                    702: 
                    703:        deprep_terminal();
                    704:        puts("");
                    705: }
                    706: #endif
                    707: #endif /* MSDOS */
                    708: 

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