File:  [gforth] / gforth / engine / io.c
Revision 1.32: download - view: text, annotated - select for diffs
Mon Dec 31 18:40:25 2007 UTC (13 years, 8 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright notices for GPL v3

    1: /* direct key io driver
    2: 
    3:   Copyright (C) 1995,1996,1997,1998,1999,2002,2003,2006,2007 Free Software Foundation, Inc.
    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 3
   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, see http://www.gnu.org/licenses/.
   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"
   28: #include "forth.h"
   29: #include <sys/time.h>
   30: #include <sys/types.h>
   31: #include <unistd.h>
   32: 
   33: #if defined(apollo) || defined(_WIN32)
   34: #define _POSIX_VERSION
   35: #endif
   36: 
   37: #if !defined(Solaris) && defined(sun) && defined(__svr4__)
   38: #define Solaris
   39: typedef unsigned int uint32_t;
   40: #endif
   41: 
   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. */
   93: #if defined (_POSIX_VERSION) || defined (NeXT)
   94: #  if !defined (TERMIOS_MISSING)
   95: #    undef NEW_TTY_DRIVER
   96: #    define TERMIOS_TTY_DRIVER
   97: #    include <termios.h>
   98: #  endif /* !TERMIOS_MISSING */
   99: #endif /* _POSIX_VERSION || NeXT */
  100: 
  101: #if defined (_POSIX_VERSION)
  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)
  118: #  if defined (_POSIX_VERSION) || defined (NeXT)
  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: 
  449: #include <locale.h>
  450: 
  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:    
  476:   setlocale(LC_ALL, "");
  477:   setlocale(LC_NUMERIC, "C");
  478: 
  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: 
  620: long key_avail (FILE * stream)
  621: {
  622:   int tty = fileno (stream);
  623:   fd_set selin;
  624:   static struct timespec now = { 0 , 0 };
  625:   int res;
  626: 
  627:   setvbuf(stream, NULL, _IONBF, 0);
  628:   if(!terminal_prepped && stream == stdin)
  629:     prep_terminal();
  630: 
  631:   FD_ZERO(&selin);
  632:   FD_SET(tty, &selin);
  633:   return select(1, &selin, NULL, NULL, &now);
  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: 
  643: Cell getkey(FILE * stream)
  644: {
  645:   Cell result;
  646:   unsigned char c;
  647: 
  648:   setvbuf(stream, NULL, _IONBF, 0);
  649:   if(!terminal_prepped && stream == stdin)
  650:     prep_terminal();
  651: 
  652:   result = fread(&c, sizeof(c), 1, stream);
  653:   return result==0 ? (errno == EINTR ? 12 : 4) : c;
  654: }
  655: 
  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: 
  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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