Annotation of gforth/engine/io.c, revision 1.30

1.10      anton       1: /* direct key io driver
1.1       anton       2: 
1.25      anton       3:   Copyright (C) 1995,1996,1997,1998,1999,2002,2003,2006 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
                      9:   as published by the Free Software Foundation; either version 2
                     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
                     18:   along with this program; if not, write to the Free Software
1.13      anton      19:   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1       anton      20: 
                     21:   The following is stolen from the readline library for bash
                     22: */
                     23: 
                     24: /*
                     25:    Use -D_POSIX_VERSION for POSIX systems.
                     26: */
                     27: 
                     28: #include "config.h"
1.15      anton      29: #include "forth.h"
1.7       pazsan     30: #include <sys/time.h>
                     31: #include <sys/types.h>
1.1       anton      32: #include <unistd.h>
                     33: 
                     34: #if defined(apollo) || defined(_WIN32)
                     35: #define _POSIX_VERSION
                     36: #endif
                     37: 
1.6       pazsan     38: #if !defined(Solaris) && defined(sun) && defined(__svr4__)
                     39: #define Solaris
                     40: typedef unsigned int uint32_t;
                     41: #endif
                     42: 
1.1       anton      43: #include <stdio.h>
                     44: #include <signal.h>
                     45: #include <string.h>
                     46: #if !defined(apollo) && !defined(MSDOS)
                     47: #include <sys/ioctl.h>
                     48: #endif
                     49: #include <fcntl.h>
                     50: #include <sys/file.h>
                     51: #if defined(Solaris) && !defined(FIONREAD)
                     52: #include <sys/filio.h>
                     53: #endif
                     54: #include <setjmp.h>
                     55: #include "io.h"
                     56: 
                     57: #ifndef MSDOS
                     58: #if defined (__GNUC__)
                     59: #  define alloca __builtin_alloca
                     60: #else
                     61: #  if defined (sparc) || defined (HAVE_ALLOCA_H)
                     62: #    include <alloca.h>
                     63: #  endif
                     64: #endif
                     65: 
                     66: #define NEW_TTY_DRIVER
                     67: #define HAVE_BSD_SIGNALS
                     68: /*
                     69: #ifndef apollo
                     70: #define USE_XON_XOFF
                     71: #endif
                     72: */
                     73: 
                     74: #define HANDLE_SIGNALS
                     75: 
                     76: /* Some USG machines have BSD signal handling (sigblock, sigsetmask, etc.) */
                     77: #if defined (USG) && !defined (hpux)
                     78: #undef HAVE_BSD_SIGNALS
                     79: #endif
                     80: 
                     81: /* System V machines use termio. */
                     82: #if !defined (_POSIX_VERSION)
                     83: #  if defined (USG) || defined (hpux) || defined (Xenix) || defined (sgi) || defined (DGUX) || defined (ultrix) || defined (Solaris) || defined(_WIN32)
                     84: #    undef NEW_TTY_DRIVER
                     85: #    define TERMIO_TTY_DRIVER
                     86: #    include <termio.h>
                     87: #    if !defined (TCOON)
                     88: #      define TCOON 1
                     89: #    endif
                     90: #  endif /* USG || hpux || Xenix || sgi || DUGX || ultrix*/
                     91: #endif /* !_POSIX_VERSION */
                     92: 
                     93: /* Posix systems use termios and the Posix signal functions. */
1.5       pazsan     94: #if defined (_POSIX_VERSION) || defined (NeXT)
1.1       anton      95: #  if !defined (TERMIOS_MISSING)
                     96: #    undef NEW_TTY_DRIVER
                     97: #    define TERMIOS_TTY_DRIVER
                     98: #    include <termios.h>
                     99: #  endif /* !TERMIOS_MISSING */
1.5       pazsan    100: #endif /* _POSIX_VERSION || NeXT */
                    101: 
                    102: #if defined (_POSIX_VERSION)
1.1       anton     103: #  define HAVE_POSIX_SIGNALS
                    104: #  if !defined (O_NDELAY)
                    105: #    define O_NDELAY O_NONBLOCK        /* Posix-style non-blocking i/o */
                    106: #  endif /* O_NDELAY */
                    107: #endif /* _POSIX_VERSION */
                    108: 
                    109: /* Other (BSD) machines use sgtty. */
                    110: #if defined (NEW_TTY_DRIVER)
                    111: #include <sgtty.h>
                    112: #endif
                    113: 
                    114: /* Define _POSIX_VDISABLE if we are not using the `new' tty driver and
                    115:    it is not already defined.  It is used both to determine if a
                    116:    special character is disabled and to disable certain special
                    117:    characters.  Posix systems should set to 0, USG systems to -1. */
                    118: #if !defined (NEW_TTY_DRIVER) && !defined (_POSIX_VDISABLE)
1.5       pazsan    119: #  if defined (_POSIX_VERSION) || defined (NeXT)
1.1       anton     120: #    define _POSIX_VDISABLE 0
                    121: #  else /* !_POSIX_VERSION */
                    122: #    define _POSIX_VDISABLE -1
                    123: #  endif /* !_POSIX_VERSION */
                    124: #endif /* !NEW_TTY_DRIVER && !_POSIX_VDISABLE */
                    125: 
                    126: #include <errno.h>
                    127: /* extern int errno; */
                    128: 
                    129: #if defined (SHELL)
                    130: #  include <posixstat.h>
                    131: #else
                    132: #  include <sys/stat.h>
                    133: #endif /* !SHELL */
                    134: /* #define HACK_TERMCAP_MOTION */
                    135: 
                    136: #if defined (USG) && defined (hpux)
                    137: #  if !defined (USGr3)
                    138: #    define USGr3
                    139: #  endif /* USGr3 */
                    140: #endif /* USG && hpux */
                    141: 
                    142: #if (defined (_POSIX_VERSION) || defined (USGr3)) && !defined(apollo)
                    143: #  include <dirent.h>
                    144: #  define direct dirent
                    145: #  if defined (_POSIX_VERSION)
                    146: #    define D_NAMLEN(d) (strlen ((d)->d_name))
                    147: #  else /* !_POSIX_VERSION */
                    148: #    define D_NAMLEN(d) ((d)->d_reclen)
                    149: #  endif /* !_POSIX_VERSION */
                    150: #else /* !_POSIX_VERSION && !USGr3 */
                    151: #  define D_NAMLEN(d) ((d)->d_namlen)
                    152: #  if !defined (USG)
                    153: #    include <sys/dir.h>
                    154: #  else /* USG */
                    155: #    if defined (Xenix)
                    156: #      include <sys/ndir.h>
                    157: #    else /* !Xenix */
                    158: #      include <ndir.h>
                    159: #    endif /* !Xenix */
                    160: #  endif /* USG */
                    161: #endif /* !POSIX_VERSION && !USGr3 */
                    162: 
                    163: #if defined (USG) && defined (TIOCGWINSZ)
                    164: #  include <sys/stream.h>
                    165: #  if defined (USGr4) || defined (USGr3)
                    166: #    if defined (Symmetry) || defined (_SEQUENT_)
                    167: #      include <sys/pte.h>
                    168: #    else
                    169: #      include <sys/ptem.h>
                    170: #    endif /* !Symmetry || _SEQUENT_ */
                    171: #  endif /* USGr4 */
                    172: #endif /* USG && TIOCGWINSZ */
                    173: 
                    174: #if defined (TERMIOS_TTY_DRIVER)
                    175: static struct termios otio;
                    176: #else
                    177: static struct termio otio;
                    178: #endif /* !TERMIOS_TTY_DRIVER */
                    179: 
                    180: /* Non-zero means echo characters as they are read. */
                    181: int readline_echoing_p = 1;
                    182: 
                    183: /* The character that can generate an EOF.  Really read from
                    184:    the terminal driver... just defaulted here. */
                    185: 
                    186: #ifndef CTRL
                    187: #define CTRL(key)      ((key)-'@')
                    188: #endif
                    189: 
                    190: static int eof_char = CTRL ('D');
                    191: 
                    192: /* **************************************************************** */
                    193: /*                                                                 */
                    194: /*                   Saving and Restoring the TTY                  */
                    195: /*                                                                 */
                    196: /* **************************************************************** */
                    197: 
                    198: /* Non-zero means that the terminal is in a prepped state. */
                    199: int terminal_prepped = 0;
                    200: 
                    201: #if defined (NEW_TTY_DRIVER)
                    202: 
                    203: /* Standard flags, including ECHO. */
                    204: static int original_tty_flags = 0;
                    205: 
                    206: /* Local mode flags, like LPASS8. */
                    207: static int local_mode_flags = 0;
                    208: 
                    209: /* Terminal characters.  This has C-s and C-q in it. */
                    210: static struct tchars original_tchars;
                    211: 
                    212: /* Local special characters.  This has the interrupt characters in it. */
                    213: #if defined (TIOCGLTC)
                    214: static struct ltchars original_ltchars;
                    215: #endif
                    216: 
                    217: /* Bind KEY to FUNCTION.  Returns non-zero if KEY is out of range. */
                    218: 
                    219: #if defined (TIOCGETC)
                    220: #if defined (USE_XON_XOFF)
                    221: 
                    222: int
                    223: bind_key (key, function)
                    224:      int key;
                    225:      Function *function;
                    226: {
                    227:   if (key < 0)
                    228:     return (key);
                    229: 
                    230:   if (key > 127 && key < 256)
                    231:     {
                    232:       if (keymap[ESC].type == ISKMAP)
                    233:        {
                    234:          Keymap escmap = (Keymap)keymap[ESC].function;
                    235: 
                    236:          key -= 128;
                    237:          escmap[key].type = ISFUNC;
                    238:          escmap[key].function = function;
                    239:          return (0);
                    240:        }
                    241:       return (key);
                    242:     }
                    243: 
                    244:   keymap[key].type = ISFUNC;
                    245:   keymap[key].function = function;
                    246:  return (0);
                    247: }
                    248: #endif
                    249: #endif
                    250: 
                    251: /* We use this to get and set the tty_flags. */
                    252: static struct sgttyb the_ttybuff;
                    253: 
                    254: #if defined (USE_XON_XOFF)
                    255: /* If the terminal was in xoff state when we got to it, then xon_char
                    256:    contains the character that is supposed to start it again. */
                    257: static int xon_char, xoff_state;
                    258: #endif /* USE_XON_XOFF */
                    259: 
                    260: /* **************************************************************** */
                    261: /*                                                                 */
                    262: /*                     Bogus Flow Control                          */
                    263: /*                                                                 */
                    264: /* **************************************************************** */
                    265: 
                    266: restart_output (count, key)
                    267:      int count, key;
                    268: {
                    269:   int fildes = fileno (stdin);
                    270: #if defined (TIOCSTART)
                    271: #if defined (apollo)
                    272:   ioctl (&fildes, TIOCSTART, 0);
                    273: #else
                    274:   ioctl (fildes, TIOCSTART, 0);
                    275: #endif /* apollo */
                    276: 
                    277: #else
                    278: #  if defined (TERMIOS_TTY_DRIVER)
                    279:         tcflow (fildes, TCOON);
                    280: #  else
                    281: #    if defined (TCXONC)
                    282:         ioctl (fildes, TCXONC, TCOON);
                    283: #    endif /* TCXONC */
                    284: #  endif /* !TERMIOS_TTY_DRIVER */
                    285: #endif /* TIOCSTART */
                    286: }
                    287: 
                    288: /* Put the terminal in CBREAK mode so that we can detect key presses. */
                    289: void prep_terminal ()
                    290: {
                    291:   int tty = fileno (stdin);
                    292: #if defined (HAVE_BSD_SIGNALS)
                    293:   int oldmask;
                    294: #endif /* HAVE_BSD_SIGNALS */
                    295: 
                    296:   if (terminal_prepped)
                    297:     return;
                    298: 
                    299:   if (!isatty(tty)) {      /* added by MdG */
                    300:     terminal_prepped = 1;      /* added by MdG */
                    301:     return;      /* added by MdG */
                    302:   }      /* added by MdG */
                    303:    
                    304:   oldmask = sigblock (sigmask (SIGINT));
                    305: 
                    306:   /* We always get the latest tty values.  Maybe stty changed them. */
                    307:   ioctl (tty, TIOCGETP, &the_ttybuff);
                    308:   original_tty_flags = the_ttybuff.sg_flags;
                    309: 
                    310:   readline_echoing_p = (original_tty_flags & ECHO);
                    311: 
                    312: #if defined (TIOCLGET)
                    313:   ioctl (tty, TIOCLGET, &local_mode_flags);
                    314: #endif
                    315: 
                    316: #if !defined (ANYP)
                    317: #  define ANYP (EVENP | ODDP)
                    318: #endif
                    319: 
                    320:   /* If this terminal doesn't care how the 8th bit is used,
                    321:      then we can use it for the meta-key.  We check by seeing
                    322:      if BOTH odd and even parity are allowed. */
                    323:   if (the_ttybuff.sg_flags & ANYP)
                    324:     {
                    325: #if defined (PASS8)
                    326:       the_ttybuff.sg_flags |= PASS8;
                    327: #endif
                    328: 
                    329:       /* Hack on local mode flags if we can. */
                    330: #if defined (TIOCLGET) && defined (LPASS8)
                    331:       {
                    332:        int flags;
                    333:        flags = local_mode_flags | LPASS8;
                    334:        ioctl (tty, TIOCLSET, &flags);
                    335:       }
                    336: #endif /* TIOCLGET && LPASS8 */
                    337:     }
                    338: 
                    339: #if defined (TIOCGETC)
                    340:   {
                    341:     struct tchars temp;
                    342: 
                    343:     ioctl (tty, TIOCGETC, &original_tchars);
                    344:     temp = original_tchars;
                    345: 
                    346: #if defined (USE_XON_XOFF)
                    347:     /* Get rid of C-s and C-q.
                    348:        We remember the value of startc (C-q) so that if the terminal is in
                    349:        xoff state, the user can xon it by pressing that character. */
                    350:     xon_char = temp.t_startc;
                    351:     temp.t_stopc = -1;
                    352:     temp.t_startc = -1;
                    353: 
                    354:     /* If there is an XON character, bind it to restart the output. */
                    355:     if (xon_char != -1)
                    356:       bind_key (xon_char, restart_output);
                    357: #endif /* USE_XON_XOFF */
                    358: 
                    359:     /* If there is an EOF char, bind eof_char to it. */
                    360:     if (temp.t_eofc != -1)
                    361:       eof_char = temp.t_eofc;
                    362: 
                    363: #if defined (NO_KILL_INTR)
                    364:     /* Get rid of C-\ and C-c. */
                    365:     temp.t_intrc = temp.t_quitc = -1;
                    366: #endif /* NO_KILL_INTR */
                    367: 
                    368:     ioctl (tty, TIOCSETC, &temp);
                    369:   }
                    370: #endif /* TIOCGETC */
                    371: 
                    372: #if defined (TIOCGLTC)
                    373:   {
                    374:     struct ltchars temp;
                    375: 
                    376:     ioctl (tty, TIOCGLTC, &original_ltchars);
                    377:     temp = original_ltchars;
                    378: 
                    379:     /* Make the interrupt keys go away.  Just enough to make people
                    380:        happy. */
                    381:     temp.t_dsuspc = -1;        /* C-y */
                    382:     temp.t_lnextc = -1;        /* C-v */
                    383: 
                    384:     ioctl (tty, TIOCSLTC, &temp);
                    385:   }
                    386: #endif /* TIOCGLTC */
                    387: 
                    388:   the_ttybuff.sg_flags &= ~(ECHO | CRMOD);
                    389:   the_ttybuff.sg_flags |= CBREAK;
                    390:   ioctl (tty, TIOCSETN, &the_ttybuff);
                    391: 
                    392:   terminal_prepped = 1;
                    393: 
                    394: #if defined (HAVE_BSD_SIGNALS)
                    395:   sigsetmask (oldmask);
                    396: #endif
                    397: }
                    398: 
                    399: /* Restore the terminal to its original state. */
                    400: void deprep_terminal ()
                    401: {
                    402:   int tty = fileno (stdin);
                    403: #if defined (HAVE_BSD_SIGNALS)
                    404:   int oldmask;
                    405: #endif
                    406: 
                    407:   if (!terminal_prepped)
                    408:     return;
                    409: 
                    410: /* Added by MdG */
                    411:   if (!isatty(tty)) {
                    412:     terminal_prepped = 0;
                    413:     return;
                    414:   }
                    415:    
                    416:   oldmask = sigblock (sigmask (SIGINT));
                    417: 
                    418:   the_ttybuff.sg_flags = original_tty_flags;
                    419:   ioctl (tty, TIOCSETN, &the_ttybuff);
                    420:   readline_echoing_p = 1;
                    421: 
                    422: #if defined (TIOCLGET)
                    423:   ioctl (tty, TIOCLSET, &local_mode_flags);
                    424: #endif
                    425: 
                    426: #if defined (TIOCSLTC)
                    427:   ioctl (tty, TIOCSLTC, &original_ltchars);
                    428: #endif
                    429: 
                    430: #if defined (TIOCSETC)
                    431:   ioctl (tty, TIOCSETC, &original_tchars);
                    432: #endif
                    433:   terminal_prepped = 0;
                    434: 
                    435: #if defined (HAVE_BSD_SIGNALS)
                    436:   sigsetmask (oldmask);
                    437: #endif
                    438: }
                    439: 
                    440: #else  /* !defined (NEW_TTY_DRIVER) */
                    441: 
                    442: #if !defined (VMIN)
                    443: #define VMIN VEOF
                    444: #endif
                    445: 
                    446: #if !defined (VTIME)
                    447: #define VTIME VEOL
                    448: #endif
                    449: 
1.18      pazsan    450: #include <locale.h>
                    451: 
1.1       anton     452: void prep_terminal ()
                    453: {
                    454:   int tty = fileno (stdin);
                    455: #if defined (TERMIOS_TTY_DRIVER)
                    456:   struct termios tio;
                    457: #else
                    458:   struct termio tio;
                    459: #endif /* !TERMIOS_TTY_DRIVER */
                    460: 
                    461: #if defined (HAVE_POSIX_SIGNALS)
                    462:   sigset_t set, oset;
                    463: #else
                    464: #  if defined (HAVE_BSD_SIGNALS)
                    465:   int oldmask;
                    466: #  endif /* HAVE_BSD_SIGNALS */
                    467: #endif /* !HAVE_POSIX_SIGNALS */
                    468: 
                    469:   if (terminal_prepped)
                    470:     return;
                    471: 
                    472:   if (!isatty(tty))  {     /* added by MdG */
                    473:     terminal_prepped = 1;      /* added by MdG */
                    474:     return;      /* added by MdG */
                    475:   }      /* added by MdG */
                    476:    
1.18      pazsan    477:   setlocale(LC_ALL, "");
1.24      pazsan    478:   setlocale(LC_NUMERIC, "C");
1.18      pazsan    479: 
1.1       anton     480:   /* Try to keep this function from being INTerrupted.  We can do it
                    481:      on POSIX and systems with BSD-like signal handling. */
                    482: #if defined (HAVE_POSIX_SIGNALS)
                    483:   sigemptyset (&set);
                    484:   sigemptyset (&oset);
                    485:   sigaddset (&set, SIGINT);
                    486:   sigprocmask (SIG_BLOCK, &set, &oset);
                    487: #else /* !HAVE_POSIX_SIGNALS */
                    488: #  if defined (HAVE_BSD_SIGNALS)
                    489:   oldmask = sigblock (sigmask (SIGINT));
                    490: #  endif /* HAVE_BSD_SIGNALS */
                    491: #endif /* !HAVE_POSIX_SIGNALS */
                    492: 
                    493: #if defined (TERMIOS_TTY_DRIVER)
                    494:   tcgetattr (tty, &tio);
                    495: #else
                    496:   ioctl (tty, TCGETA, &tio);
                    497: #endif /* !TERMIOS_TTY_DRIVER */
                    498: 
                    499:   otio = tio;
                    500: 
                    501:   readline_echoing_p = (tio.c_lflag & ECHO);
                    502: 
                    503:   tio.c_lflag &= ~(ICANON | ECHO);
                    504: 
                    505:   if (otio.c_cc[VEOF] != _POSIX_VDISABLE)
                    506:     eof_char = otio.c_cc[VEOF];
                    507: 
                    508: #if defined (USE_XON_XOFF)
                    509: #if defined (IXANY)
                    510:   tio.c_iflag &= ~(IXON | IXOFF | IXANY);
                    511: #else
                    512:   /* `strict' Posix systems do not define IXANY. */
                    513:   tio.c_iflag &= ~(IXON | IXOFF);
                    514: #endif /* IXANY */
                    515: #endif /* USE_XON_XOFF */
                    516: 
                    517:   /* Only turn this off if we are using all 8 bits. */
                    518:   if ((tio.c_cflag & CSIZE) == CS8)
                    519:     tio.c_iflag &= ~(ISTRIP | INPCK);
                    520: 
                    521:   /* Make sure we differentiate between CR and NL on input. */
                    522:   tio.c_iflag &= ~(ICRNL | INLCR);
                    523: 
                    524: #if !defined (HANDLE_SIGNALS)
                    525:   tio.c_lflag &= ~ISIG;
                    526: #else
                    527:   tio.c_lflag |= ISIG;
                    528: #endif
                    529: 
                    530:   tio.c_cc[VMIN] = 1;
                    531:   tio.c_cc[VTIME] = 0;
                    532: 
                    533:   /* Turn off characters that we need on Posix systems with job control,
                    534:      just to be sure.  This includes ^Y and ^V.  This should not really
                    535:      be necessary.  */
                    536: #if defined (TERMIOS_TTY_DRIVER) && defined (_POSIX_JOB_CONTROL)
                    537: 
                    538: #if defined (VLNEXT)
                    539:   tio.c_cc[VLNEXT] = _POSIX_VDISABLE;
                    540: #endif
                    541: 
                    542: #if defined (VDSUSP)
                    543:   tio.c_cc[VDSUSP] = _POSIX_VDISABLE;
                    544: #endif
                    545: 
                    546: #endif /* POSIX && JOB_CONTROL */
                    547: 
                    548: #if defined (TERMIOS_TTY_DRIVER)
                    549:   tcsetattr (tty, TCSADRAIN, &tio);
                    550:   tcflow (tty, TCOON);         /* Simulate a ^Q. */
                    551: #else
                    552:   ioctl (tty, TCSETAW, &tio);
                    553:   ioctl (tty, TCXONC, 1);      /* Simulate a ^Q. */
                    554: #endif /* !TERMIOS_TTY_DRIVER */
                    555: 
                    556:   terminal_prepped = 1;
                    557: 
                    558: #if defined (HAVE_POSIX_SIGNALS)
                    559:   sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
                    560: #else
                    561: #  if defined (HAVE_BSD_SIGNALS)
                    562:   sigsetmask (oldmask);
                    563: #  endif /* HAVE_BSD_SIGNALS */
                    564: #endif /* !HAVE_POSIX_SIGNALS */
                    565: }
                    566: 
                    567: void deprep_terminal ()
                    568: {
                    569:   int tty = fileno (stdin);
                    570: 
                    571:   /* Try to keep this function from being INTerrupted.  We can do it
                    572:      on POSIX and systems with BSD-like signal handling. */
                    573: #if defined (HAVE_POSIX_SIGNALS)
                    574:   sigset_t set, oset;
                    575: #else /* !HAVE_POSIX_SIGNALS */
                    576: #  if defined (HAVE_BSD_SIGNALS)
                    577:   int oldmask;
                    578: #  endif /* HAVE_BSD_SIGNALS */
                    579: #endif /* !HAVE_POSIX_SIGNALS */
                    580: 
                    581:   if (!terminal_prepped)
                    582:     return;
                    583: 
                    584: /* Added by MdG */
                    585:   if (!isatty(tty)) {
                    586:     terminal_prepped = 0;
                    587:     return;
                    588:   }
                    589: 
                    590: #if defined (HAVE_POSIX_SIGNALS)
                    591:   sigemptyset (&set);
                    592:   sigemptyset (&oset);
                    593:   sigaddset (&set, SIGINT);
                    594:   sigprocmask (SIG_BLOCK, &set, &oset);
                    595: #else /* !HAVE_POSIX_SIGNALS */
                    596: #  if defined (HAVE_BSD_SIGNALS)
                    597:   oldmask = sigblock (sigmask (SIGINT));
                    598: #  endif /* HAVE_BSD_SIGNALS */
                    599: #endif /* !HAVE_POSIX_SIGNALS */
                    600: 
                    601: #if defined (TERMIOS_TTY_DRIVER)
                    602:   tcsetattr (tty, TCSADRAIN, &otio);
                    603:   tcflow (tty, TCOON);         /* Simulate a ^Q. */
                    604: #else /* TERMIOS_TTY_DRIVER */
                    605:   ioctl (tty, TCSETAW, &otio);
                    606:   ioctl (tty, TCXONC, 1);      /* Simulate a ^Q. */
                    607: #endif /* !TERMIOS_TTY_DRIVER */
                    608: 
                    609:   terminal_prepped = 0;
                    610: 
                    611: #if defined (HAVE_POSIX_SIGNALS)
                    612:   sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
                    613: #else /* !HAVE_POSIX_SIGNALS */
                    614: #  if defined (HAVE_BSD_SIGNALS)
                    615:   sigsetmask (oldmask);
                    616: #  endif /* HAVE_BSD_SIGNALS */
                    617: #endif /* !HAVE_POSIX_SIGNALS */
                    618: }
                    619: #endif  /* NEW_TTY_DRIVER */
                    620: 
1.7       pazsan    621: long key_avail (FILE * stream)
1.1       anton     622: {
                    623:   int tty = fileno (stream);
1.21      anton     624:   fd_set selin;
1.28      pazsan    625:   static struct timespec now = { 0 , 0 };
1.21      anton     626:   int res;
1.1       anton     627: 
1.22      anton     628:   setvbuf(stream, NULL, _IONBF, 0);
1.20      anton     629:   if(!terminal_prepped && stream == stdin)
                    630:     prep_terminal();
1.1       anton     631: 
1.21      anton     632:   FD_ZERO(&selin);
                    633:   FD_SET(tty, &selin);
1.28      pazsan    634:   return select(1, &selin, NULL, NULL, &now);
1.1       anton     635: }
                    636: 
                    637: /* Get a key from the buffer of characters to be read.
                    638:    Return the key in KEY.
                    639:    Result is KEY if there was a key, or 0 if there wasn't. */
                    640: 
                    641: /* When compiling and running in the `Posix' environment, Ultrix does
                    642:    not restart system calls, so this needs to do it. */
                    643: 
1.11      anton     644: Cell getkey(FILE * stream)
1.1       anton     645: {
1.11      anton     646:   Cell result;
1.1       anton     647:   unsigned char c;
                    648: 
1.23      anton     649:   setvbuf(stream, NULL, _IONBF, 0);
1.22      anton     650:   if(!terminal_prepped && stream == stdin)
1.11      anton     651:     prep_terminal();
1.1       anton     652: 
1.22      anton     653:   result = fread(&c, sizeof(c), 1, stream);
1.30    ! pazsan    654:   return result==0 ? (errno == EINTR ? 12 : 4) : c;
1.1       anton     655: }
                    656: 
1.26      pazsan    657: #ifdef STANDALONE
                    658: void emit_char(char x)
                    659: {
                    660:   putc(x, stdout);
                    661: }
                    662: 
                    663: void type_chars(char *addr, unsigned int l)
                    664: {
                    665:   fwrite(addr, l, 1, stdout);
                    666: }
                    667: #endif
                    668: 
1.1       anton     669: #ifdef TEST
                    670: 
                    671: #include <time.h>
                    672: 
                    673: int timewait=100000;
                    674: 
                    675: int main()
                    676: {
                    677:        unsigned char c;
                    678: 
                    679:        prep_terminal();
                    680: 
                    681:        do
                    682:        {
                    683:                int i=0;
                    684: 
                    685:                while(!key_avail(stdin))
                    686:                {
                    687:                        printf("%04d",i);
                    688:                        fflush(stdout);
                    689:                        {
                    690:                                struct timeval timeout;
                    691:                                timeout.tv_sec=timewait/1000000;
                    692:                                timeout.tv_usec=timewait%1000000;
                    693:                                (void)select(0,0,0,0,&timeout);
                    694:                        }
                    695:                        i++;
                    696:                        printf("\b\b\b\b");
                    697:                        fflush(stdout);
                    698:                }
                    699:                c = getkey(stdin);
                    700:                printf("%02x,",(int)c);
                    701:                fflush(stdout);
                    702:        }       while(c != 0x1B);
                    703: 
                    704:        deprep_terminal();
                    705:        puts("");
                    706: }
                    707: #endif
                    708: #endif /* MSDOS */
                    709: 

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