Annotation of gforth/engine/io.c, revision 1.36
1.10 anton 1: /* direct key io driver
1.1 anton 2:
1.34 anton 3: Copyright (C) 1995,1996,1997,1998,1999,2002,2003,2006,2007,2008 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:
1.36 ! anton 42: #include <stdlib.h>
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:
1.36 ! anton 621: /* an ungetc() variant where we can know that there is a character waiting:
! 622: gf_ungetc: like ungetc
! 623: gf_regetc: call when reading a char, but does not get the character
! 624: gf_ungottenc: true if there is a char waiting
! 625:
! 626: Implementation: just an array containing all the FILEs with ungotten chars.
! 627: Sequential search for membership checking (there should not be many elements)
! 628: */
! 629:
! 630: static FILE **ungotten_files = NULL;
! 631: static size_t n_ungotten = 0; /* actual number */
! 632: static size_t max_ungotten = 0; /* buffer size */
! 633:
! 634: int gf_ungetc(int c, FILE *stream)
! 635: /* like ungetc, but works with the others */
! 636: {
! 637: if (n_ungotten>=max_ungotten) {
! 638: max_ungotten = max_ungotten*2+1;
! 639: ungotten_files = realloc(ungotten_files, max_ungotten*sizeof(FILE *));
! 640: }
! 641: ungotten_files[n_ungotten++] = stream;
! 642: return ungetc(c, stream);
! 643: }
! 644:
! 645: static long search_ungotten(FILE *stream)
! 646: {
! 647: long i;
! 648: for (i=0; i<n_ungotten; i++)
! 649: if (ungotten_files[i] == stream)
! 650: return i;
! 651: return -1;
! 652: }
! 653:
! 654: void gf_regetc(FILE *stream)
! 655: /* remove STREAM from ungotten_files */
! 656: {
! 657: long i = search_ungotten(stream);
! 658: if (i>=0)
! 659: ungotten_files[i] = ungotten_files[--n_ungotten];
! 660: }
! 661:
! 662: int gf_ungottenc(FILE *stream)
! 663: /* true if stream has been ungotten */
! 664: {
! 665: return search_ungotten(stream)>=0;
! 666: }
! 667:
! 668: long key_avail (FILE *stream)
1.1 anton 669: {
670: int tty = fileno (stream);
1.21 anton 671: fd_set selin;
1.33 anton 672: static struct timeval now = { 0 , 0 };
1.35 pazsan 673: int chars_avail;
1.1 anton 674:
1.22 anton 675: setvbuf(stream, NULL, _IONBF, 0);
1.20 anton 676: if(!terminal_prepped && stream == stdin)
677: prep_terminal();
1.36 ! anton 678: if (gf_ungottenc(stream))
! 679: return 1;
1.1 anton 680:
1.21 anton 681: FD_ZERO(&selin);
682: FD_SET(tty, &selin);
1.35 pazsan 683: chars_avail = select(1, &selin, NULL, NULL, &now);
1.36 ! anton 684: if (chars_avail > 0) {
! 685: /* getc won't block */
! 686: int c = getc(stream);
! 687: if (c==EOF)
! 688: return 0;
! 689: gf_ungetc(c, stream);
! 690: }
1.35 pazsan 691: return (chars_avail == -1) ? 0 : chars_avail;
1.1 anton 692: }
693:
694: /* Get a key from the buffer of characters to be read.
695: Return the key in KEY.
696: Result is KEY if there was a key, or 0 if there wasn't. */
697:
698: /* When compiling and running in the `Posix' environment, Ultrix does
699: not restart system calls, so this needs to do it. */
700:
1.11 anton 701: Cell getkey(FILE * stream)
1.1 anton 702: {
1.11 anton 703: Cell result;
1.1 anton 704: unsigned char c;
705:
1.23 anton 706: setvbuf(stream, NULL, _IONBF, 0);
1.22 anton 707: if(!terminal_prepped && stream == stdin)
1.11 anton 708: prep_terminal();
1.1 anton 709:
1.22 anton 710: result = fread(&c, sizeof(c), 1, stream);
1.30 pazsan 711: return result==0 ? (errno == EINTR ? 12 : 4) : c;
1.1 anton 712: }
713:
1.26 pazsan 714: #ifdef STANDALONE
715: void emit_char(char x)
716: {
717: putc(x, stdout);
718: }
719:
720: void type_chars(char *addr, unsigned int l)
721: {
722: fwrite(addr, l, 1, stdout);
723: }
724: #endif
725:
1.1 anton 726: #ifdef TEST
727:
728: #include <time.h>
729:
730: int timewait=100000;
731:
732: int main()
733: {
734: unsigned char c;
735:
736: prep_terminal();
737:
738: do
739: {
740: int i=0;
741:
742: while(!key_avail(stdin))
743: {
744: printf("%04d",i);
745: fflush(stdout);
746: {
747: struct timeval timeout;
748: timeout.tv_sec=timewait/1000000;
749: timeout.tv_usec=timewait%1000000;
750: (void)select(0,0,0,0,&timeout);
751: }
752: i++;
753: printf("\b\b\b\b");
754: fflush(stdout);
755: }
756: c = getkey(stdin);
757: printf("%02x,",(int)c);
758: fflush(stdout);
759: } while(c != 0x1B);
760:
761: deprep_terminal();
762: puts("");
763: }
764: #endif
765: #endif /* MSDOS */
766:
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