/[LeafOK_CVS]/lbbs/src/io.c
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Revision 1.40 - (hide annotations)
Thu Jun 5 08:36:02 2025 UTC (9 months, 1 week ago) by sysadm
Branch: MAIN
Changes since 1.39: +2 -1 lines
Content type: text/x-csrc 
Listen at both telnet and ssh port
1 sysadm 1.1 /***************************************************************************
2 sysadm 1.14 io.c - description
3     -------------------
4 sysadm 1.20 Copyright : (C) 2004-2025 by Leaflet
5     Email : leaflet@leafok.com
6 sysadm 1.1 ***************************************************************************/
7    
8     /***************************************************************************
9     * *
10     * This program is free software; you can redistribute it and/or modify *
11     * it under the terms of the GNU General Public License as published by *
12 sysadm 1.20 * the Free Software Foundation; either version 3 of the License, or *
13 sysadm 1.1 * (at your option) any later version. *
14     * *
15     ***************************************************************************/
16    
17     #include "io.h"
18 sysadm 1.16 #include "log.h"
19 sysadm 1.1 #include "common.h"
20 sysadm 1.22 #include <errno.h>
21 sysadm 1.1 #include <stdio.h>
22     #include <stdarg.h>
23 sysadm 1.28 #include <string.h>
24 sysadm 1.9 #include <time.h>
25     #include <fcntl.h>
26     #include <unistd.h>
27 sysadm 1.22 #include <sys/select.h>
28 sysadm 1.5 #include <sys/ioctl.h>
29 sysadm 1.29 #include <sys/epoll.h>
30 sysadm 1.39 #include <libssh/libssh.h>
31     #include <libssh/server.h>
32     #include <libssh/callbacks.h>
33 sysadm 1.1
34 sysadm 1.28 static char stdout_buf[BUFSIZ];
35     static int stdout_buf_len = 0;
36 sysadm 1.30 static int stdout_buf_offset = 0;
37 sysadm 1.1
38 sysadm 1.14 int prints(const char *format, ...)
39 sysadm 1.1 {
40 sysadm 1.28 char buf[BUFSIZ];
41 sysadm 1.14 va_list args;
42 sysadm 1.28 int ret;
43 sysadm 1.1
44 sysadm 1.14 va_start(args, format);
45 sysadm 1.28 ret = vsnprintf(buf, sizeof(buf), format, args);
46 sysadm 1.14 va_end(args);
47 sysadm 1.1
48 sysadm 1.30 if (ret > 0)
49 sysadm 1.28 {
50 sysadm 1.30 if (stdout_buf_len + ret > BUFSIZ)
51     {
52     iflush();
53     }
54 sysadm 1.31
55 sysadm 1.30 if (stdout_buf_len + ret <= BUFSIZ)
56     {
57     memcpy(stdout_buf + stdout_buf_len, buf, (size_t)ret);
58     stdout_buf_len += ret;
59     }
60     else
61     {
62     errno = EAGAIN;
63     ret = (BUFSIZ - stdout_buf_len - ret);
64 sysadm 1.35 log_error("Output buffer is full, additional %d is required\n", ret);
65 sysadm 1.30 }
66 sysadm 1.28 }
67 sysadm 1.30
68     return ret;
69     }
70    
71     int outc(char c)
72     {
73     int ret;
74    
75     if (stdout_buf_len + 1 > BUFSIZ)
76 sysadm 1.28 {
77 sysadm 1.30 iflush();
78     }
79    
80     if (stdout_buf_len + 1 <= BUFSIZ)
81     {
82     stdout_buf[stdout_buf_len] = c;
83     stdout_buf_len++;
84     }
85     else
86     {
87     errno = EAGAIN;
88     ret = -1;
89 sysadm 1.28 }
90    
91     return ret;
92 sysadm 1.1 }
93    
94 sysadm 1.14 int iflush()
95 sysadm 1.1 {
96 sysadm 1.28 int flags;
97 sysadm 1.29 struct epoll_event ev, events[MAX_EVENTS];
98     int nfds, epollfd;
99 sysadm 1.30 int retry;
100 sysadm 1.28 int ret = 0;
101    
102 sysadm 1.29 epollfd = epoll_create1(0);
103     if (epollfd < 0)
104     {
105     log_error("epoll_create1() error (%d)\n", errno);
106     return -1;
107     }
108    
109     ev.events = EPOLLOUT;
110     ev.data.fd = STDOUT_FILENO;
111     if (epoll_ctl(epollfd, EPOLL_CTL_ADD, STDOUT_FILENO, &ev) == -1)
112     {
113     log_error("epoll_ctl(STDOUT_FILENO) error (%d)\n", errno);
114 sysadm 1.31 if (close(epollfd) < 0)
115     {
116     log_error("close(epoll) error (%d)\n");
117     }
118 sysadm 1.29 return -1;
119     }
120    
121 sysadm 1.28 // Set STDOUT as non-blocking
122     flags = fcntl(STDOUT_FILENO, F_GETFL, 0);
123     fcntl(STDOUT_FILENO, F_SETFL, flags | O_NONBLOCK);
124    
125 sysadm 1.30 // Retry wait / flush for at most 3 times
126     retry = 3;
127     while (retry > 0 && !SYS_server_exit)
128 sysadm 1.28 {
129 sysadm 1.30 retry--;
130    
131 sysadm 1.29 nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
132 sysadm 1.28
133 sysadm 1.29 if (nfds < 0)
134 sysadm 1.28 {
135 sysadm 1.29 if (errno != EINTR)
136     {
137     log_error("epoll_wait() error (%d)\n", errno);
138     break;
139     }
140 sysadm 1.28 continue;
141     }
142 sysadm 1.29 else if (nfds == 0) // timeout
143 sysadm 1.28 {
144 sysadm 1.29 continue;
145 sysadm 1.28 }
146 sysadm 1.29
147     for (int i = 0; i < nfds; i++)
148 sysadm 1.28 {
149 sysadm 1.29 if (events[i].data.fd == STDOUT_FILENO)
150 sysadm 1.28 {
151 sysadm 1.30 while (stdout_buf_offset < stdout_buf_len && !SYS_server_exit) // write until complete or error
152 sysadm 1.28 {
153 sysadm 1.39 if (SSH_v2)
154     {
155     ret = ssh_channel_write(SSH_channel, stdout_buf + stdout_buf_offset, (uint32_t)(stdout_buf_len - stdout_buf_offset));
156     if (ret == SSH_ERROR)
157     {
158     log_error("ssh_channel_write() error: %s\n", ssh_get_error(SSH_session));
159     retry = 0;
160     break;
161     }
162     }
163     else
164     {
165     ret = (int)write(STDOUT_FILENO, stdout_buf + stdout_buf_offset, (size_t)(stdout_buf_len - stdout_buf_offset));
166     }
167 sysadm 1.29 if (ret < 0)
168     {
169     if (errno == EAGAIN || errno == EWOULDBLOCK)
170     {
171     break;
172     }
173     else if (errno == EINTR)
174     {
175     continue;
176     }
177     else
178     {
179     log_error("write(STDOUT) error (%d)\n", errno);
180 sysadm 1.30 retry = 0;
181 sysadm 1.29 break;
182     }
183     }
184     else if (ret == 0) // broken pipe
185     {
186 sysadm 1.30 retry = 0;
187 sysadm 1.29 break;
188     }
189     else
190     {
191     stdout_buf_offset += ret;
192 sysadm 1.30 if (stdout_buf_offset >= stdout_buf_len) // flush buffer completely
193 sysadm 1.29 {
194     ret = 0;
195 sysadm 1.30 stdout_buf_offset = 0;
196 sysadm 1.29 stdout_buf_len = 0;
197 sysadm 1.30 retry = 0;
198 sysadm 1.29 break;
199     }
200     continue;
201     }
202 sysadm 1.28 }
203     }
204     }
205     }
206 sysadm 1.6
207 sysadm 1.28 // Restore STDOUT flags
208     fcntl(STDOUT_FILENO, F_SETFL, flags);
209 sysadm 1.6
210 sysadm 1.31 if (close(epollfd) < 0)
211     {
212     log_error("close(epoll) error (%d)\n");
213     }
214    
215 sysadm 1.28 return ret;
216 sysadm 1.1 }
217    
218 sysadm 1.31 int igetch(int timeout)
219 sysadm 1.1 {
220 sysadm 1.18 // static input buffer
221 sysadm 1.22 static unsigned char buf[LINE_BUFFER_LEN];
222 sysadm 1.31 static int len = 0;
223 sysadm 1.18 static int pos = 0;
224    
225 sysadm 1.29 struct epoll_event ev, events[MAX_EVENTS];
226     int nfds, epollfd;
227 sysadm 1.31 int ret;
228     int loop;
229 sysadm 1.21
230 sysadm 1.22 unsigned char tmp[LINE_BUFFER_LEN];
231 sysadm 1.31 int out = KEY_NULL;
232 sysadm 1.18 int in_esc = 0;
233     int in_ascii = 0;
234     int in_control = 0;
235     int i = 0;
236 sysadm 1.26 int flags;
237 sysadm 1.1
238 sysadm 1.29 epollfd = epoll_create1(0);
239     if (epollfd < 0)
240     {
241     log_error("epoll_create1() error (%d)\n", errno);
242     return -1;
243     }
244    
245     ev.events = EPOLLIN;
246     ev.data.fd = STDIN_FILENO;
247     if (epoll_ctl(epollfd, EPOLL_CTL_ADD, STDIN_FILENO, &ev) == -1)
248 sysadm 1.14 {
249 sysadm 1.29 log_error("epoll_ctl(STDIN_FILENO) error (%d)\n", errno);
250 sysadm 1.31
251     if (close(epollfd) < 0)
252     {
253     log_error("close(epoll) error (%d)\n");
254     }
255 sysadm 1.29 return -1;
256     }
257 sysadm 1.9
258 sysadm 1.29 flags = fcntl(STDIN_FILENO, F_GETFL, 0);
259     fcntl(STDIN_FILENO, F_SETFL, flags | O_NONBLOCK);
260 sysadm 1.9
261 sysadm 1.31 loop = 1;
262    
263     while (loop && pos >= len && !SYS_server_exit)
264 sysadm 1.29 {
265 sysadm 1.31 len = 0;
266     pos = 0;
267    
268 sysadm 1.39 if (SSH_v2 && ssh_channel_is_closed(SSH_channel))
269     {
270     log_error("SSH channel is closed\n");
271     loop = 0;
272     break;
273     }
274    
275 sysadm 1.31 nfds = epoll_wait(epollfd, events, MAX_EVENTS, timeout);
276 sysadm 1.9
277 sysadm 1.29 if (nfds < 0)
278 sysadm 1.14 {
279 sysadm 1.21 if (errno != EINTR)
280     {
281 sysadm 1.29 log_error("epoll_wait() error (%d)\n", errno);
282 sysadm 1.31 break;
283 sysadm 1.21 }
284     continue;
285 sysadm 1.14 }
286 sysadm 1.31 else if (nfds == 0) // timeout
287 sysadm 1.14 {
288 sysadm 1.31 out = KEY_TIMEOUT;
289     break;
290 sysadm 1.14 }
291 sysadm 1.21
292 sysadm 1.29 for (int i = 0; i < nfds; i++)
293 sysadm 1.14 {
294 sysadm 1.29 if (events[i].data.fd == STDIN_FILENO)
295 sysadm 1.26 {
296 sysadm 1.31 while (len < sizeof(buf) && !SYS_server_exit) // read until complete or error
297 sysadm 1.26 {
298 sysadm 1.39 if (SSH_v2)
299     {
300     ret = ssh_channel_read_nonblocking(SSH_channel, buf + len, sizeof(buf) - (uint32_t)len, 0);
301     if (ret == SSH_ERROR)
302     {
303     log_error("ssh_channel_read_nonblocking() error: %s\n", ssh_get_error(SSH_session));
304     loop = 0;
305     break;
306     }
307     else if (ret == SSH_EOF)
308     {
309     loop = 0;
310     break;
311     }
312     else if (ret == 0)
313     {
314 sysadm 1.40 out = 0;
315 sysadm 1.39 break; // Check whether channel is still open
316     }
317     }
318     else
319     {
320     ret = (int)read(STDIN_FILENO, buf + len, sizeof(buf) - (size_t)len);
321     }
322 sysadm 1.31 if (ret < 0)
323 sysadm 1.29 {
324     if (errno == EAGAIN || errno == EWOULDBLOCK)
325     {
326 sysadm 1.32 out = 0;
327 sysadm 1.31 loop = 0;
328     break;
329 sysadm 1.29 }
330     else if (errno == EINTR)
331     {
332     continue;
333     }
334     else
335     {
336     log_error("read(STDIN) error (%d)\n", errno);
337 sysadm 1.31 loop = 0;
338     break;
339 sysadm 1.29 }
340     }
341 sysadm 1.31 else if (ret == 0) // broken pipe
342 sysadm 1.29 {
343 sysadm 1.31 loop = 0;
344     break;
345     }
346     else
347     {
348     len += ret;
349     continue;
350 sysadm 1.29 }
351 sysadm 1.26 }
352     }
353 sysadm 1.14 }
354    
355     // For debug
356 sysadm 1.33 // for (int j = pos; j < len; j++)
357     // {
358 sysadm 1.38 // log_common("Debug: <--[%u]\n", (buf[j] + 256) % 256);
359 sysadm 1.33 // }
360 sysadm 1.11 }
361 sysadm 1.14
362 sysadm 1.29 fcntl(STDIN_FILENO, F_SETFL, flags);
363    
364 sysadm 1.14 while (pos < len)
365 sysadm 1.11 {
366 sysadm 1.18 unsigned char c = buf[pos++];
367 sysadm 1.5
368 sysadm 1.14 if (c == KEY_CONTROL)
369     {
370     if (in_control == 0)
371     {
372     in_control = 1;
373     i = 0;
374     continue;
375     }
376     }
377 sysadm 1.1
378 sysadm 1.14 if (in_control)
379     {
380     tmp[i++] = c;
381     if (i >= 2)
382     {
383     out = (int)tmp[0] * 256 + tmp[1];
384     in_control = 0;
385     break;
386     }
387     continue;
388     }
389 sysadm 1.6
390 sysadm 1.37 if (c == KEY_ESC)
391 sysadm 1.14 {
392     if (in_esc == 0)
393     {
394     in_esc = 1;
395     in_ascii = 1;
396     i = 0;
397     continue;
398     }
399     else
400     {
401 sysadm 1.37 out = KEY_CSI;
402 sysadm 1.14 in_esc = 0;
403     break;
404     }
405     }
406 sysadm 1.3
407 sysadm 1.14 in_esc = 0;
408 sysadm 1.1
409 sysadm 1.14 if (in_ascii)
410     {
411     tmp[i++] = c;
412 sysadm 1.33 if (i == 2 && (tmp[0] == 79 || tmp[0] == 91))
413 sysadm 1.14 {
414     in_ascii = 0;
415 sysadm 1.33 switch (tmp[1])
416 sysadm 1.14 {
417 sysadm 1.33 case 65:
418 sysadm 1.14 out = KEY_UP;
419     break;
420 sysadm 1.33 case 66:
421 sysadm 1.14 out = KEY_DOWN;
422     break;
423 sysadm 1.33 case 67:
424 sysadm 1.14 out = KEY_RIGHT;
425     break;
426 sysadm 1.33 case 68:
427 sysadm 1.14 out = KEY_LEFT;
428     break;
429 sysadm 1.33 default:
430     in_ascii = 1;
431     }
432     if (!in_ascii)
433     {
434     break;
435     }
436     }
437     if (i == 2 && tmp[0] == 91) // Fterm
438     {
439     in_ascii = 0;
440     switch (tmp[1])
441     {
442     case 86:
443     out = KEY_SHIFT_F1;
444     break;
445     case 90:
446     out = KEY_SHIFT_F2;
447     break;
448     case 97:
449     out = KEY_SHIFT_F3;
450     break;
451     case 98:
452     out = KEY_SHIFT_F4;
453     break;
454     case 99:
455     out = KEY_SHIFT_F5;
456     break;
457     case 100:
458     out = KEY_SHIFT_F6;
459     break;
460     case 101:
461     out = KEY_SHIFT_F7;
462     break;
463     case 102:
464     out = KEY_SHIFT_F8;
465     break;
466     case 103:
467     out = KEY_SHIFT_F9;
468     break;
469     case 104:
470     out = KEY_SHIFT_F10;
471     break;
472     case 107:
473     out = KEY_CTRL_F1;
474     break;
475     case 108:
476     out = KEY_CTRL_F2;
477     break;
478     case 109:
479     out = KEY_CTRL_F3;
480     break;
481     case 112:
482     out = KEY_CTRL_F6;
483     break;
484     case 113:
485     out = KEY_CTRL_F7;
486     break;
487     case 114:
488     out = KEY_CTRL_F8;
489     break;
490     case 115:
491     out = KEY_CTRL_F9;
492     break;
493     case 116:
494     out = KEY_CTRL_F10;
495     break;
496     default:
497     in_ascii = 1;
498     }
499     if (!in_ascii)
500     {
501     break;
502     }
503     }
504     if (i == 2 && tmp[0] == 79) // Xterm
505     {
506     in_ascii = 0;
507     switch (tmp[1])
508     {
509     case 80:
510     out = KEY_F1;
511     break;
512     case 81:
513     out = KEY_F2;
514     break;
515     case 82:
516     out = KEY_F3;
517     break;
518     case 83:
519     out = KEY_F4;
520     break;
521     default:
522     in_ascii = 1;
523     }
524     if (!in_ascii)
525     {
526     break;
527 sysadm 1.14 }
528     }
529     if (i == 3 && tmp[0] == 91 && tmp[2] == 126)
530     {
531     in_ascii = 0;
532     switch (tmp[1])
533     {
534     case 49:
535     out = KEY_HOME;
536     break;
537     case 51:
538     out = KEY_DEL;
539     break;
540     case 52:
541     out = KEY_END;
542     break;
543     case 53:
544     out = KEY_PGUP;
545     break;
546     case 54:
547     out = KEY_PGDN;
548     break;
549 sysadm 1.33 default:
550     in_ascii = 1;
551     }
552     if (!in_ascii)
553     {
554     break;
555     }
556     }
557 sysadm 1.39 if (i == 4 && tmp[0] == 91 && tmp[1] == 49 && tmp[3] == 126) // Fterm
558 sysadm 1.33 {
559     in_ascii = 0;
560     switch (tmp[2])
561     {
562     case 49:
563     out = KEY_F1;
564     break;
565     case 50:
566     out = KEY_F2;
567     break;
568     case 51:
569     out = KEY_F3;
570     break;
571     case 52:
572     out = KEY_F4;
573     break;
574     case 53:
575     out = KEY_F5;
576     break;
577     case 55:
578     out = KEY_F6;
579     break;
580     case 56:
581     out = KEY_F7;
582     break;
583     case 57:
584     out = KEY_F8;
585     break;
586     default:
587     in_ascii = 1;
588     }
589     if (!in_ascii)
590     {
591     break;
592     }
593     }
594     if (i == 4 && tmp[0] == 91 && tmp[1] == 50 && tmp[3] == 126) // Fterm
595     {
596     in_ascii = 0;
597     switch (tmp[2])
598     {
599     case 48:
600     out = KEY_F9;
601     break;
602     case 49:
603     out = KEY_F10;
604     break;
605     case 50:
606     out = KEY_F11; // Fterm
607     break;
608     case 51:
609     out = KEY_F11; // Xterm
610     break;
611     case 52:
612     out = KEY_F12; // Xterm
613     break;
614     default:
615     in_ascii = 1;
616     }
617     if (!in_ascii)
618     {
619     break;
620     }
621     }
622     if (i == 5 && tmp[0] == 91 && tmp[1] == 49 && tmp[2] == 59 && tmp[3] == 53) // Xterm
623     {
624     in_ascii = 0;
625     switch (tmp[4])
626     {
627     case 80:
628     out = KEY_CTRL_F1;
629     break;
630     case 81:
631     out = KEY_CTRL_F2;
632     break;
633     case 82:
634     out = KEY_CTRL_F3;
635     break;
636     default:
637     in_ascii = 1;
638     }
639     if (!in_ascii)
640     {
641     break;
642     }
643     }
644     if (i == 6 && tmp[0] == 91 && tmp[1] == 49 && tmp[3] == 59 && tmp[4] == 53 && tmp[5] == 126) // Xterm
645     {
646     in_ascii = 0;
647     switch (tmp[2])
648     {
649     case 53:
650     out = KEY_CTRL_F5;
651     break;
652     case 55:
653     out = KEY_CTRL_F6;
654     break;
655     case 56:
656     out = KEY_CTRL_F7;
657     break;
658     case 57:
659     out = KEY_CTRL_F8;
660     break;
661     default:
662     in_ascii = 1;
663     }
664     if (!in_ascii)
665     {
666     break;
667     }
668     }
669     if (i == 6 && tmp[0] == 91 && tmp[1] == 50 && tmp[3] == 59 && tmp[4] == 53 && tmp[5] == 126) // Xterm
670     {
671     in_ascii = 0;
672     switch (tmp[2])
673     {
674     case 48:
675     out = KEY_CTRL_F9;
676     break;
677     case 49:
678     out = KEY_CTRL_F10;
679     break;
680     case 51:
681     out = KEY_CTRL_F11;
682     break;
683     case 52:
684     out = KEY_CTRL_F12;
685     break;
686     default:
687     in_ascii = 1;
688     }
689     if (!in_ascii)
690     {
691     break;
692     }
693     }
694     if (i == 5 && tmp[0] == 91 && tmp[1] == 49 && tmp[2] == 59 && tmp[3] == 50) // Xterm
695     {
696     in_ascii = 0;
697     switch (tmp[4])
698     {
699     case 80:
700     out = KEY_SHIFT_F1;
701     break;
702     case 81:
703     out = KEY_SHIFT_F2;
704     break;
705     case 82:
706     out = KEY_SHIFT_F3;
707     break;
708     case 83:
709     out = KEY_SHIFT_F4;
710     break;
711     default:
712     in_ascii = 1;
713     }
714     if (!in_ascii)
715     {
716     break;
717 sysadm 1.14 }
718 sysadm 1.33 }
719     if (i == 6 && tmp[0] == 91 && tmp[1] == 49 && tmp[3] == 59 && tmp[4] == 50 && tmp[5] == 126) // Xterm
720     {
721     in_ascii = 0;
722     switch (tmp[2])
723     {
724     case 53:
725     out = KEY_SHIFT_F5;
726     break;
727     case 55:
728     out = KEY_SHIFT_F6;
729     break;
730     case 56:
731     out = KEY_SHIFT_F7;
732     break;
733     case 57:
734     out = KEY_SHIFT_F8;
735     break;
736     default:
737     in_ascii = 1;
738     }
739     if (!in_ascii)
740     {
741     break;
742     }
743     }
744     if (i == 6 && tmp[0] == 91 && tmp[1] == 50 && tmp[3] == 59 && tmp[4] == 50 && tmp[5] == 126) // Xterm
745     {
746     in_ascii = 0;
747     switch (tmp[2])
748     {
749     case 48:
750     out = KEY_SHIFT_F9;
751     break;
752     case 49:
753     out = KEY_SHIFT_F10;
754     break;
755     case 51:
756     out = KEY_SHIFT_F11;
757     break;
758     case 52:
759     out = KEY_SHIFT_F12;
760     break;
761     default:
762     in_ascii = 1;
763     }
764     if (!in_ascii)
765     {
766     break;
767     }
768     }
769    
770     if (c == 'm')
771     {
772     in_ascii = 0;
773 sysadm 1.14 }
774     continue;
775     }
776 sysadm 1.1
777 sysadm 1.14 out = ((int)c + 256) % 256;
778     break;
779 sysadm 1.1 }
780    
781 sysadm 1.31 if (close(epollfd) < 0)
782     {
783     log_error("close(epoll) error (%d)\n");
784     }
785    
786 sysadm 1.36 // For ESC key
787     if (out == 0 && in_esc)
788     {
789     out = KEY_ESC;
790     }
791    
792 sysadm 1.33 // for debug
793 sysadm 1.34 // if (out != KEY_TIMEOUT && out != KEY_NULL)
794     // {
795 sysadm 1.40 // log_common("Debug: -->[0x %x]\n", out);
796 sysadm 1.34 // }
797 sysadm 1.33
798 sysadm 1.14 return out;
799 sysadm 1.1 }
800 sysadm 1.5
801 sysadm 1.31 int igetch_t(int sec)
802 sysadm 1.9 {
803 sysadm 1.14 int ch;
804     time_t t_begin = time(0);
805 sysadm 1.10
806 sysadm 1.14 do
807     {
808 sysadm 1.31 ch = igetch(100);
809 sysadm 1.25 } while (!SYS_server_exit && ch == KEY_TIMEOUT && (time(0) - t_begin < sec));
810 sysadm 1.9
811 sysadm 1.14 return ch;
812 sysadm 1.9 }
813 sysadm 1.31
814     void igetch_reset()
815     {
816     int ch;
817     do
818     {
819     ch = igetch(0);
820     } while (ch != KEY_NULL && ch != KEY_TIMEOUT);
821     }
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