/[LeafOK_CVS]/lbbs/src/io.c
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Revision 1.39 - (hide annotations)
Thu Jun 5 05:24:56 2025 UTC (9 months, 1 week ago) by sysadm
Branch: MAIN
Changes since 1.38: +48 -3 lines
Content type: text/x-csrc 
Add SSH2 support
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     break; // Check whether channel is still open
315     }
316     }
317     else
318     {
319     ret = (int)read(STDIN_FILENO, buf + len, sizeof(buf) - (size_t)len);
320     }
321 sysadm 1.31 if (ret < 0)
322 sysadm 1.29 {
323     if (errno == EAGAIN || errno == EWOULDBLOCK)
324     {
325 sysadm 1.32 out = 0;
326 sysadm 1.31 loop = 0;
327     break;
328 sysadm 1.29 }
329     else if (errno == EINTR)
330     {
331     continue;
332     }
333     else
334     {
335     log_error("read(STDIN) error (%d)\n", errno);
336 sysadm 1.31 loop = 0;
337     break;
338 sysadm 1.29 }
339     }
340 sysadm 1.31 else if (ret == 0) // broken pipe
341 sysadm 1.29 {
342 sysadm 1.31 loop = 0;
343     break;
344     }
345     else
346     {
347     len += ret;
348     continue;
349 sysadm 1.29 }
350 sysadm 1.26 }
351     }
352 sysadm 1.14 }
353    
354     // For debug
355 sysadm 1.33 // for (int j = pos; j < len; j++)
356     // {
357 sysadm 1.38 // log_common("Debug: <--[%u]\n", (buf[j] + 256) % 256);
358 sysadm 1.33 // }
359 sysadm 1.11 }
360 sysadm 1.14
361 sysadm 1.29 fcntl(STDIN_FILENO, F_SETFL, flags);
362    
363 sysadm 1.14 while (pos < len)
364 sysadm 1.11 {
365 sysadm 1.18 unsigned char c = buf[pos++];
366 sysadm 1.5
367 sysadm 1.14 if (c == KEY_CONTROL)
368     {
369     if (in_control == 0)
370     {
371     in_control = 1;
372     i = 0;
373     continue;
374     }
375     }
376 sysadm 1.1
377 sysadm 1.14 if (in_control)
378     {
379     tmp[i++] = c;
380     if (i >= 2)
381     {
382     out = (int)tmp[0] * 256 + tmp[1];
383     in_control = 0;
384     break;
385     }
386     continue;
387     }
388 sysadm 1.6
389 sysadm 1.37 if (c == KEY_ESC)
390 sysadm 1.14 {
391     if (in_esc == 0)
392     {
393     in_esc = 1;
394     in_ascii = 1;
395     i = 0;
396     continue;
397     }
398     else
399     {
400 sysadm 1.37 out = KEY_CSI;
401 sysadm 1.14 in_esc = 0;
402     break;
403     }
404     }
405 sysadm 1.3
406 sysadm 1.14 in_esc = 0;
407 sysadm 1.1
408 sysadm 1.14 if (in_ascii)
409     {
410     tmp[i++] = c;
411 sysadm 1.33 if (i == 2 && (tmp[0] == 79 || tmp[0] == 91))
412 sysadm 1.14 {
413     in_ascii = 0;
414 sysadm 1.33 switch (tmp[1])
415 sysadm 1.14 {
416 sysadm 1.33 case 65:
417 sysadm 1.14 out = KEY_UP;
418     break;
419 sysadm 1.33 case 66:
420 sysadm 1.14 out = KEY_DOWN;
421     break;
422 sysadm 1.33 case 67:
423 sysadm 1.14 out = KEY_RIGHT;
424     break;
425 sysadm 1.33 case 68:
426 sysadm 1.14 out = KEY_LEFT;
427     break;
428 sysadm 1.33 default:
429     in_ascii = 1;
430     }
431     if (!in_ascii)
432     {
433     break;
434     }
435     }
436     if (i == 2 && tmp[0] == 91) // Fterm
437     {
438     in_ascii = 0;
439     switch (tmp[1])
440     {
441     case 86:
442     out = KEY_SHIFT_F1;
443     break;
444     case 90:
445     out = KEY_SHIFT_F2;
446     break;
447     case 97:
448     out = KEY_SHIFT_F3;
449     break;
450     case 98:
451     out = KEY_SHIFT_F4;
452     break;
453     case 99:
454     out = KEY_SHIFT_F5;
455     break;
456     case 100:
457     out = KEY_SHIFT_F6;
458     break;
459     case 101:
460     out = KEY_SHIFT_F7;
461     break;
462     case 102:
463     out = KEY_SHIFT_F8;
464     break;
465     case 103:
466     out = KEY_SHIFT_F9;
467     break;
468     case 104:
469     out = KEY_SHIFT_F10;
470     break;
471     case 107:
472     out = KEY_CTRL_F1;
473     break;
474     case 108:
475     out = KEY_CTRL_F2;
476     break;
477     case 109:
478     out = KEY_CTRL_F3;
479     break;
480     case 112:
481     out = KEY_CTRL_F6;
482     break;
483     case 113:
484     out = KEY_CTRL_F7;
485     break;
486     case 114:
487     out = KEY_CTRL_F8;
488     break;
489     case 115:
490     out = KEY_CTRL_F9;
491     break;
492     case 116:
493     out = KEY_CTRL_F10;
494     break;
495     default:
496     in_ascii = 1;
497     }
498     if (!in_ascii)
499     {
500     break;
501     }
502     }
503     if (i == 2 && tmp[0] == 79) // Xterm
504     {
505     in_ascii = 0;
506     switch (tmp[1])
507     {
508     case 80:
509     out = KEY_F1;
510     break;
511     case 81:
512     out = KEY_F2;
513     break;
514     case 82:
515     out = KEY_F3;
516     break;
517     case 83:
518     out = KEY_F4;
519     break;
520     default:
521     in_ascii = 1;
522     }
523     if (!in_ascii)
524     {
525     break;
526 sysadm 1.14 }
527     }
528     if (i == 3 && tmp[0] == 91 && tmp[2] == 126)
529     {
530     in_ascii = 0;
531     switch (tmp[1])
532     {
533     case 49:
534     out = KEY_HOME;
535     break;
536     case 51:
537     out = KEY_DEL;
538     break;
539     case 52:
540     out = KEY_END;
541     break;
542     case 53:
543     out = KEY_PGUP;
544     break;
545     case 54:
546     out = KEY_PGDN;
547     break;
548 sysadm 1.33 default:
549     in_ascii = 1;
550     }
551     if (!in_ascii)
552     {
553     break;
554     }
555     }
556 sysadm 1.39 if (i == 4 && tmp[0] == 91 && tmp[1] == 49 && tmp[3] == 126) // Fterm
557 sysadm 1.33 {
558     in_ascii = 0;
559     switch (tmp[2])
560     {
561     case 49:
562     out = KEY_F1;
563     break;
564     case 50:
565     out = KEY_F2;
566     break;
567     case 51:
568     out = KEY_F3;
569     break;
570     case 52:
571     out = KEY_F4;
572     break;
573     case 53:
574     out = KEY_F5;
575     break;
576     case 55:
577     out = KEY_F6;
578     break;
579     case 56:
580     out = KEY_F7;
581     break;
582     case 57:
583     out = KEY_F8;
584     break;
585     default:
586     in_ascii = 1;
587     }
588     if (!in_ascii)
589     {
590     break;
591     }
592     }
593     if (i == 4 && tmp[0] == 91 && tmp[1] == 50 && tmp[3] == 126) // Fterm
594     {
595     in_ascii = 0;
596     switch (tmp[2])
597     {
598     case 48:
599     out = KEY_F9;
600     break;
601     case 49:
602     out = KEY_F10;
603     break;
604     case 50:
605     out = KEY_F11; // Fterm
606     break;
607     case 51:
608     out = KEY_F11; // Xterm
609     break;
610     case 52:
611     out = KEY_F12; // Xterm
612     break;
613     default:
614     in_ascii = 1;
615     }
616     if (!in_ascii)
617     {
618     break;
619     }
620     }
621     if (i == 5 && tmp[0] == 91 && tmp[1] == 49 && tmp[2] == 59 && tmp[3] == 53) // Xterm
622     {
623     in_ascii = 0;
624     switch (tmp[4])
625     {
626     case 80:
627     out = KEY_CTRL_F1;
628     break;
629     case 81:
630     out = KEY_CTRL_F2;
631     break;
632     case 82:
633     out = KEY_CTRL_F3;
634     break;
635     default:
636     in_ascii = 1;
637     }
638     if (!in_ascii)
639     {
640     break;
641     }
642     }
643     if (i == 6 && tmp[0] == 91 && tmp[1] == 49 && tmp[3] == 59 && tmp[4] == 53 && tmp[5] == 126) // Xterm
644     {
645     in_ascii = 0;
646     switch (tmp[2])
647     {
648     case 53:
649     out = KEY_CTRL_F5;
650     break;
651     case 55:
652     out = KEY_CTRL_F6;
653     break;
654     case 56:
655     out = KEY_CTRL_F7;
656     break;
657     case 57:
658     out = KEY_CTRL_F8;
659     break;
660     default:
661     in_ascii = 1;
662     }
663     if (!in_ascii)
664     {
665     break;
666     }
667     }
668     if (i == 6 && tmp[0] == 91 && tmp[1] == 50 && tmp[3] == 59 && tmp[4] == 53 && tmp[5] == 126) // Xterm
669     {
670     in_ascii = 0;
671     switch (tmp[2])
672     {
673     case 48:
674     out = KEY_CTRL_F9;
675     break;
676     case 49:
677     out = KEY_CTRL_F10;
678     break;
679     case 51:
680     out = KEY_CTRL_F11;
681     break;
682     case 52:
683     out = KEY_CTRL_F12;
684     break;
685     default:
686     in_ascii = 1;
687     }
688     if (!in_ascii)
689     {
690     break;
691     }
692     }
693     if (i == 5 && tmp[0] == 91 && tmp[1] == 49 && tmp[2] == 59 && tmp[3] == 50) // Xterm
694     {
695     in_ascii = 0;
696     switch (tmp[4])
697     {
698     case 80:
699     out = KEY_SHIFT_F1;
700     break;
701     case 81:
702     out = KEY_SHIFT_F2;
703     break;
704     case 82:
705     out = KEY_SHIFT_F3;
706     break;
707     case 83:
708     out = KEY_SHIFT_F4;
709     break;
710     default:
711     in_ascii = 1;
712     }
713     if (!in_ascii)
714     {
715     break;
716 sysadm 1.14 }
717 sysadm 1.33 }
718     if (i == 6 && tmp[0] == 91 && tmp[1] == 49 && tmp[3] == 59 && tmp[4] == 50 && tmp[5] == 126) // Xterm
719     {
720     in_ascii = 0;
721     switch (tmp[2])
722     {
723     case 53:
724     out = KEY_SHIFT_F5;
725     break;
726     case 55:
727     out = KEY_SHIFT_F6;
728     break;
729     case 56:
730     out = KEY_SHIFT_F7;
731     break;
732     case 57:
733     out = KEY_SHIFT_F8;
734     break;
735     default:
736     in_ascii = 1;
737     }
738     if (!in_ascii)
739     {
740     break;
741     }
742     }
743     if (i == 6 && tmp[0] == 91 && tmp[1] == 50 && tmp[3] == 59 && tmp[4] == 50 && tmp[5] == 126) // Xterm
744     {
745     in_ascii = 0;
746     switch (tmp[2])
747     {
748     case 48:
749     out = KEY_SHIFT_F9;
750     break;
751     case 49:
752     out = KEY_SHIFT_F10;
753     break;
754     case 51:
755     out = KEY_SHIFT_F11;
756     break;
757     case 52:
758     out = KEY_SHIFT_F12;
759     break;
760     default:
761     in_ascii = 1;
762     }
763     if (!in_ascii)
764     {
765     break;
766     }
767     }
768    
769     if (c == 'm')
770     {
771     in_ascii = 0;
772 sysadm 1.14 }
773     continue;
774     }
775 sysadm 1.1
776 sysadm 1.14 out = ((int)c + 256) % 256;
777     break;
778 sysadm 1.1 }
779    
780 sysadm 1.31 if (close(epollfd) < 0)
781     {
782     log_error("close(epoll) error (%d)\n");
783     }
784    
785 sysadm 1.36 // For ESC key
786     if (out == 0 && in_esc)
787     {
788     out = KEY_ESC;
789     }
790    
791 sysadm 1.33 // for debug
792 sysadm 1.34 // if (out != KEY_TIMEOUT && out != KEY_NULL)
793     // {
794 sysadm 1.38 // log_common ("Debug: -->[0x %x]\n", out);
795 sysadm 1.34 // }
796 sysadm 1.33
797 sysadm 1.14 return out;
798 sysadm 1.1 }
799 sysadm 1.5
800 sysadm 1.31 int igetch_t(int sec)
801 sysadm 1.9 {
802 sysadm 1.14 int ch;
803     time_t t_begin = time(0);
804 sysadm 1.10
805 sysadm 1.14 do
806     {
807 sysadm 1.31 ch = igetch(100);
808 sysadm 1.25 } while (!SYS_server_exit && ch == KEY_TIMEOUT && (time(0) - t_begin < sec));
809 sysadm 1.9
810 sysadm 1.14 return ch;
811 sysadm 1.9 }
812 sysadm 1.31
813     void igetch_reset()
814     {
815     int ch;
816     do
817     {
818     ch = igetch(0);
819     } while (ch != KEY_NULL && ch != KEY_TIMEOUT);
820     }
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