Annotation of gforth/engine/io.c, revision 1.19
1.10 anton 1: /* direct key io driver
1.1 anton 2:
1.17 anton 3: Copyright (C) 1995,1996,1997,1998,1999,2002,2003 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, "");
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:
620: /* If a character is available to be read, then read it
621: and stuff it into IBUFFER. Otherwise, just return. */
1.19 ! anton 622: long pending = -1L;
! 623: /* !! This is a bug: if key_avail(file1) is followed by getkey(file2),
! 624: the getkey(file2) can return the character from file1. - anton */
1.1 anton 625:
1.19 ! anton 626: /* Moreover, key_avail and getkey bypass the buffering of the FILE *,
! 627: leading to unpleasant effects if KEY-FILE and KEY?-FILE are mixed
! 628: with READ-FILE and READ-LINE */
1.1 anton 629:
1.7 pazsan 630: long key_avail (FILE * stream)
1.1 anton 631: {
632: int tty = fileno (stream);
1.4 pazsan 633: int chars_avail = pending;
1.1 anton 634: int result;
635:
636: if(!terminal_prepped) prep_terminal();
637:
1.14 anton 638: #if defined(FIONREAD) && !defined(_WIN32)
1.19 ! anton 639: /* !! What is the point of this part? it does not affect
! 640: chars_avail, and "result" is never used - anton */
1.7 pazsan 641: if(isatty (tty)) {
642: result = ioctl (tty, FIONREAD, &chars_avail);
643: }
1.1 anton 644: #else
645: {
1.7 pazsan 646: fd_set selin;
647: static int now[2] = { 0 , 0 };
648: int res;
649:
650: FD_ZERO(&selin);
651: FD_SET(tty, &selin);
652: chars_avail=select(1, &selin, NULL, NULL, now);
1.1 anton 653: }
654: #endif
1.7 pazsan 655:
656: if(chars_avail == -1L) {
657: unsigned char inchar;
658:
659: fcntl(tty, F_SETFL, O_NDELAY);
660: result = read(tty, &inchar, sizeof(char));
661: if(result == sizeof(char)) {
662: chars_avail = 1;
663: pending = (long)inchar;
664: } else {
665: chars_avail = 0;
1.1 anton 666: }
1.7 pazsan 667: fcntl(tty, F_SETFL, 0);
668: }
1.1 anton 669:
670: return chars_avail;
671: }
672:
673: /* Get a key from the buffer of characters to be read.
674: Return the key in KEY.
675: Result is KEY if there was a key, or 0 if there wasn't. */
676:
677: /* When compiling and running in the `Posix' environment, Ultrix does
678: not restart system calls, so this needs to do it. */
679:
1.11 anton 680: Cell getkey(FILE * stream)
1.1 anton 681: {
1.11 anton 682: Cell result;
1.1 anton 683: unsigned char c;
684:
1.11 anton 685: if(!terminal_prepped)
686: prep_terminal();
1.1 anton 687:
688: while (pending < 0)
689: {
690: result = read (fileno (stream), &c, sizeof (char));
691:
692: if (result == sizeof (char))
693: return /* (c == 0x7F ? 0x08 :*/ c /*)*/;
694:
695: /* If zero characters are returned, then the file that we are
696: reading from is empty! Return EOF in that case. */
697: if (result == 0)
1.9 pazsan 698: return (EOF);
1.1 anton 699:
700: /* If the error that we received was SIGINT, then try again,
701: this is simply an interrupted system call to read ().
702: Otherwise, some error ocurred, also signifying EOF. */
703: if (errno != EINTR)
704: return (EOF);
705: }
706:
1.11 anton 707: /* otherwise there is a character pending;
708: return it and delete pending char */
709: result = (Cell) pending;
1.1 anton 710: pending = -1L;
711:
712: return result;
713: }
714:
715: #ifdef TEST
716:
717: #include <time.h>
718:
719: int timewait=100000;
720:
721: int main()
722: {
723: unsigned char c;
724:
725: prep_terminal();
726:
727: do
728: {
729: int i=0;
730:
731: while(!key_avail(stdin))
732: {
733: printf("%04d",i);
734: fflush(stdout);
735: {
736: struct timeval timeout;
737: timeout.tv_sec=timewait/1000000;
738: timeout.tv_usec=timewait%1000000;
739: (void)select(0,0,0,0,&timeout);
740: }
741: i++;
742: printf("\b\b\b\b");
743: fflush(stdout);
744: }
745: c = getkey(stdin);
746: printf("%02x,",(int)c);
747: fflush(stdout);
748: } while(c != 0x1B);
749:
750: deprep_terminal();
751: puts("");
752: }
753: #endif
754: #endif /* MSDOS */
755:
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