lbbs/src/io.c

/***************************************************************************
                                                        io.c  -  description
                                                         -------------------
        Copyright            : (C) 2004-2025 by Leaflet
        Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "io.h"
#include "log.h"
#include "common.h"
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <sys/epoll.h>

static char stdout_buf[BUFSIZ];
static int stdout_buf_len = 0;
static int stdout_buf_offset = 0;

int prints(const char *format, ...)
{
        char buf[BUFSIZ];
        va_list args;
        int ret;

        va_start(args, format);
        ret = vsnprintf(buf, sizeof(buf), format, args);
        va_end(args);

        if (ret > 0)
        {
                if (stdout_buf_len + ret > BUFSIZ)
                {
                        iflush();
                }

                if (stdout_buf_len + ret <= BUFSIZ)
                {
                        memcpy(stdout_buf + stdout_buf_len, buf, (size_t)ret);
                        stdout_buf_len += ret;
                }
                else
                {
                        errno = EAGAIN;
                        ret = (BUFSIZ - stdout_buf_len - ret);
                }
        }

        return ret;
}

int outc(char c)
{
        int ret;

        if (stdout_buf_len + 1 > BUFSIZ)
        {
                iflush();
        }

        if (stdout_buf_len + 1 <= BUFSIZ)
        {
                stdout_buf[stdout_buf_len] = c;
                stdout_buf_len++;
        }
        else
        {
                errno = EAGAIN;
                ret = -1;
        }

        return ret;
}

int iflush()
{
        int flags;
        struct epoll_event ev, events[MAX_EVENTS];
        int nfds, epollfd;
        int retry;
        int ret = 0;

        epollfd = epoll_create1(0);
        if (epollfd < 0)
        {
                log_error("epoll_create1() error (%d)\n", errno);
                return -1;
        }

        ev.events = EPOLLOUT;
        ev.data.fd = STDOUT_FILENO;
        if (epoll_ctl(epollfd, EPOLL_CTL_ADD, STDOUT_FILENO, &ev) == -1)
        {
                log_error("epoll_ctl(STDOUT_FILENO) error (%d)\n", errno);
                if (close(epollfd) < 0)
                {
                        log_error("close(epoll) error (%d)\n");
                }
                return -1;
        }

        // Set STDOUT as non-blocking
        flags = fcntl(STDOUT_FILENO, F_GETFL, 0);
        fcntl(STDOUT_FILENO, F_SETFL, flags | O_NONBLOCK);

        // Retry wait / flush for at most 3 times
        retry = 3;
        while (retry > 0 && !SYS_server_exit)
        {
                retry--;

                nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second

                if (nfds < 0)
                {
                        if (errno != EINTR)
                        {
                                log_error("epoll_wait() error (%d)\n", errno);
                                break;
                        }
                        continue;
                }
                else if (nfds == 0) // timeout
                {
                        continue;
                }

                for (int i = 0; i < nfds; i++)
                {
                        if (events[i].data.fd == STDOUT_FILENO)
                        {
                                while (stdout_buf_offset < stdout_buf_len && !SYS_server_exit) // write until complete or error
                                {
                                        ret = (int)write(STDOUT_FILENO, stdout_buf + stdout_buf_offset, (size_t)(stdout_buf_len - stdout_buf_offset));
                                        if (ret < 0)
                                        {
                                                if (errno == EAGAIN || errno == EWOULDBLOCK)
                                                {
                                                        break;
                                                }
                                                else if (errno == EINTR)
                                                {
                                                        continue;
                                                }
                                                else
                                                {
                                                        log_error("write(STDOUT) error (%d)\n", errno);
                                                        retry = 0;
                                                        break;
                                                }
                                        }
                                        else if (ret == 0) // broken pipe
                                        {
                                                retry = 0;
                                                break;
                                        }
                                        else
                                        {
                                                stdout_buf_offset += ret;
                                                if (stdout_buf_offset >= stdout_buf_len) // flush buffer completely
                                                {
                                                        ret = 0;
                                                        stdout_buf_offset = 0;
                                                        stdout_buf_len = 0;
                                                        retry = 0;
                                                        break;
                                                }
                                                continue;
                                        }
                                }
                        }
                }
        }

        // Restore STDOUT flags
        fcntl(STDOUT_FILENO, F_SETFL, flags);

        if (close(epollfd) < 0)
        {
                log_error("close(epoll) error (%d)\n");
        }

        return ret;
}

int igetch(int timeout)
{
        // static input buffer
        static unsigned char buf[LINE_BUFFER_LEN];
        static int len = 0;
        static int pos = 0;

        struct epoll_event ev, events[MAX_EVENTS];
        int nfds, epollfd;
        int ret;
        int loop;

        unsigned char tmp[LINE_BUFFER_LEN];
        int out = KEY_NULL;
        int in_esc = 0;
        int in_ascii = 0;
        int in_control = 0;
        int i = 0;
        int flags;

        epollfd = epoll_create1(0);
        if (epollfd < 0)
        {
                log_error("epoll_create1() error (%d)\n", errno);
                return -1;
        }

        ev.events = EPOLLIN;
        ev.data.fd = STDIN_FILENO;
        if (epoll_ctl(epollfd, EPOLL_CTL_ADD, STDIN_FILENO, &ev) == -1)
        {
                log_error("epoll_ctl(STDIN_FILENO) error (%d)\n", errno);

                if (close(epollfd) < 0)
                {
                        log_error("close(epoll) error (%d)\n");
                }
                return -1;
        }

        flags = fcntl(STDIN_FILENO, F_GETFL, 0);
        fcntl(STDIN_FILENO, F_SETFL, flags | O_NONBLOCK);

        loop = 1;

        while (loop && pos >= len && !SYS_server_exit)
        {
                len = 0;
                pos = 0;

                nfds = epoll_wait(epollfd, events, MAX_EVENTS, timeout);

                if (nfds < 0)
                {
                        if (errno != EINTR)
                        {
                                log_error("epoll_wait() error (%d)\n", errno);
                                break;
                        }
                        continue;
                }
                else if (nfds == 0) // timeout
                {
                        out = KEY_TIMEOUT;
                        break;
                }

                for (int i = 0; i < nfds; i++)
                {
                        if (events[i].data.fd == STDIN_FILENO)
                        {
                                while (len < sizeof(buf) && !SYS_server_exit) // read until complete or error
                                {
                                        ret = (int)read(STDIN_FILENO, buf + len, sizeof(buf) - (size_t)len);
                                        if (ret < 0)
                                        {
                                                if (errno == EAGAIN || errno == EWOULDBLOCK)
                                                {
                                                        loop = 0;
                                                        break;
                                                }
                                                else if (errno == EINTR)
                                                {
                                                        continue;
                                                }
                                                else
                                                {
                                                        log_error("read(STDIN) error (%d)\n", errno);
                                                        loop = 0;
                                                        break;
                                                }
                                        }
                                        else if (ret == 0) // broken pipe
                                        {
                                                loop = 0;
                                                break;
                                        }
                                        else
                                        {
                                                len += ret;
                                                continue;
                                        }
                                }
                        }
                }

                // For debug
                // for (j = 0; j < len; j++)
                //   log_std ("<--[%u]\n", (buf[j] + 256) % 256);
        }

        fcntl(STDIN_FILENO, F_SETFL, flags);

        while (pos < len)
        {
                unsigned char c = buf[pos++];

                if (c == KEY_CONTROL)
                {
                        if (in_control == 0)
                        {
                                in_control = 1;
                                i = 0;
                                continue;
                        }
                }

                if (in_control)
                {
                        tmp[i++] = c;
                        if (i >= 2)
                        {
                                out = (int)tmp[0] * 256 + tmp[1];
                                in_control = 0;
                                break;
                        }
                        continue;
                }

                if (c == ESC_KEY)
                {
                        if (in_esc == 0)
                        {
                                in_esc = 1;
                                in_ascii = 1;
                                i = 0;
                                continue;
                        }
                        else
                        {
                                out = ESC_KEY;
                                in_esc = 0;
                                break;
                        }
                }

                in_esc = 0;

                if (in_ascii)
                {
                        tmp[i++] = c;
                        if (c == 'm')
                        {
                                in_ascii = 0;
                                continue;
                        }
                        if (i == 2 && c >= 'A' && c <= 'D')
                        {
                                in_ascii = 0;
                                switch (c)
                                {
                                case 'A':
                                        out = KEY_UP;
                                        break;
                                case 'B':
                                        out = KEY_DOWN;
                                        break;
                                case 'C':
                                        out = KEY_RIGHT;
                                        break;
                                case 'D':
                                        out = KEY_LEFT;
                                        break;
                                }
                                break;
                        }
                        if (i == 3 && tmp[0] == 91 && tmp[2] == 126)
                        {
                                in_ascii = 0;
                                switch (tmp[1])
                                {
                                case 49:
                                        out = KEY_HOME;
                                        break;
                                case 51:
                                        out = KEY_DEL;
                                        break;
                                case 52:
                                        out = KEY_END;
                                        break;
                                case 53:
                                        out = KEY_PGUP;
                                        break;
                                case 54:
                                        out = KEY_PGDN;
                                        break;
                                }
                                break;
                        }
                        continue;
                }

                out = ((int)c + 256) % 256;
                break;
        }

        // for debug
        // log_std ("-->[%u]\n", out);

        if (close(epollfd) < 0)
        {
                log_error("close(epoll) error (%d)\n");
        }

        return out;
}

int igetch_t(int sec)
{
        int ch;
        time_t t_begin = time(0);

        do
        {
                ch = igetch(100);
        } while (!SYS_server_exit && ch == KEY_TIMEOUT && (time(0) - t_begin < sec));

        return ch;
}

void igetch_reset()
{
        int ch;
        do
        {
                ch = igetch(0);
        } while (ch != KEY_NULL && ch != KEY_TIMEOUT);
}
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	1.1
31	sysadm	1.28	static char stdout_buf[BUFSIZ];
32			static int stdout_buf_len = 0;
33	sysadm	1.30	static int stdout_buf_offset = 0;
34	sysadm	1.1
35	sysadm	1.14	int prints(const char *format, ...)
36	sysadm	1.1	{
37	sysadm	1.28	char buf[BUFSIZ];
38	sysadm	1.14	va_list args;
39	sysadm	1.28	int ret;
40	sysadm	1.1
41	sysadm	1.14	va_start(args, format);
42	sysadm	1.28	ret = vsnprintf(buf, sizeof(buf), format, args);
43	sysadm	1.14	va_end(args);
44	sysadm	1.1
45	sysadm	1.30	if (ret > 0)
46	sysadm	1.28	{
47	sysadm	1.30	if (stdout_buf_len + ret > BUFSIZ)
48			{
49			iflush();
50			}
51	sysadm	1.31
52	sysadm	1.30	if (stdout_buf_len + ret <= BUFSIZ)
53			{
54			memcpy(stdout_buf + stdout_buf_len, buf, (size_t)ret);
55			stdout_buf_len += ret;
56			}
57			else
58			{
59			errno = EAGAIN;
60			ret = (BUFSIZ - stdout_buf_len - ret);
61			}
62	sysadm	1.28	}
63	sysadm	1.30
64			return ret;
65			}
66
67			int outc(char c)
68			{
69			int ret;
70
71			if (stdout_buf_len + 1 > BUFSIZ)
72	sysadm	1.28	{
73	sysadm	1.30	iflush();
74			}
75
76			if (stdout_buf_len + 1 <= BUFSIZ)
77			{
78			stdout_buf[stdout_buf_len] = c;
79			stdout_buf_len++;
80			}
81			else
82			{
83			errno = EAGAIN;
84			ret = -1;
85	sysadm	1.28	}
86
87			return ret;
88	sysadm	1.1	}
89
90	sysadm	1.14	int iflush()
91	sysadm	1.1	{
92	sysadm	1.28	int flags;
93	sysadm	1.29	struct epoll_event ev, events[MAX_EVENTS];
94			int nfds, epollfd;
95	sysadm	1.30	int retry;
96	sysadm	1.28	int ret = 0;
97
98	sysadm	1.29	epollfd = epoll_create1(0);
99			if (epollfd < 0)
100			{
101			log_error("epoll_create1() error (%d)\n", errno);
102			return -1;
103			}
104
105			ev.events = EPOLLOUT;
106			ev.data.fd = STDOUT_FILENO;
107			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, STDOUT_FILENO, &ev) == -1)
108			{
109			log_error("epoll_ctl(STDOUT_FILENO) error (%d)\n", errno);
110	sysadm	1.31	if (close(epollfd) < 0)
111			{
112			log_error("close(epoll) error (%d)\n");
113			}
114	sysadm	1.29	return -1;
115			}
116
117	sysadm	1.28	// Set STDOUT as non-blocking
118			flags = fcntl(STDOUT_FILENO, F_GETFL, 0);
119			fcntl(STDOUT_FILENO, F_SETFL, flags \| O_NONBLOCK);
120
121	sysadm	1.30	// Retry wait / flush for at most 3 times
122			retry = 3;
123			while (retry > 0 && !SYS_server_exit)
124	sysadm	1.28	{
125	sysadm	1.30	retry--;
126
127	sysadm	1.29	nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
128	sysadm	1.28
129	sysadm	1.29	if (nfds < 0)
130	sysadm	1.28	{
131	sysadm	1.29	if (errno != EINTR)
132			{
133			log_error("epoll_wait() error (%d)\n", errno);
134			break;
135			}
136	sysadm	1.28	continue;
137			}
138	sysadm	1.29	else if (nfds == 0) // timeout
139	sysadm	1.28	{
140	sysadm	1.29	continue;
141	sysadm	1.28	}
142	sysadm	1.29
143			for (int i = 0; i < nfds; i++)
144	sysadm	1.28	{
145	sysadm	1.29	if (events[i].data.fd == STDOUT_FILENO)
146	sysadm	1.28	{
147	sysadm	1.30	while (stdout_buf_offset < stdout_buf_len && !SYS_server_exit) // write until complete or error
148	sysadm	1.28	{
149	sysadm	1.29	ret = (int)write(STDOUT_FILENO, stdout_buf + stdout_buf_offset, (size_t)(stdout_buf_len - stdout_buf_offset));
150			if (ret < 0)
151			{
152			if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
153			{
154			break;
155			}
156			else if (errno == EINTR)
157			{
158			continue;
159			}
160			else
161			{
162			log_error("write(STDOUT) error (%d)\n", errno);
163	sysadm	1.30	retry = 0;
164	sysadm	1.29	break;
165			}
166			}
167			else if (ret == 0) // broken pipe
168			{
169	sysadm	1.30	retry = 0;
170	sysadm	1.29	break;
171			}
172			else
173			{
174			stdout_buf_offset += ret;
175	sysadm	1.30	if (stdout_buf_offset >= stdout_buf_len) // flush buffer completely
176	sysadm	1.29	{
177			ret = 0;
178	sysadm	1.30	stdout_buf_offset = 0;
179	sysadm	1.29	stdout_buf_len = 0;
180	sysadm	1.30	retry = 0;
181	sysadm	1.29	break;
182			}
183			continue;
184			}
185	sysadm	1.28	}
186			}
187			}
188			}
189	sysadm	1.6
190	sysadm	1.28	// Restore STDOUT flags
191			fcntl(STDOUT_FILENO, F_SETFL, flags);
192	sysadm	1.6
193	sysadm	1.31	if (close(epollfd) < 0)
194			{
195			log_error("close(epoll) error (%d)\n");
196			}
197
198	sysadm	1.28	return ret;
199	sysadm	1.1	}
200
201	sysadm	1.31	int igetch(int timeout)
202	sysadm	1.1	{
203	sysadm	1.18	// static input buffer
204	sysadm	1.22	static unsigned char buf[LINE_BUFFER_LEN];
205	sysadm	1.31	static int len = 0;
206	sysadm	1.18	static int pos = 0;
207
208	sysadm	1.29	struct epoll_event ev, events[MAX_EVENTS];
209			int nfds, epollfd;
210	sysadm	1.31	int ret;
211			int loop;
212	sysadm	1.21
213	sysadm	1.22	unsigned char tmp[LINE_BUFFER_LEN];
214	sysadm	1.31	int out = KEY_NULL;
215	sysadm	1.18	int in_esc = 0;
216			int in_ascii = 0;
217			int in_control = 0;
218			int i = 0;
219	sysadm	1.26	int flags;
220	sysadm	1.1
221	sysadm	1.29	epollfd = epoll_create1(0);
222			if (epollfd < 0)
223			{
224			log_error("epoll_create1() error (%d)\n", errno);
225			return -1;
226			}
227
228			ev.events = EPOLLIN;
229			ev.data.fd = STDIN_FILENO;
230			if (epoll_ctl(epollfd, EPOLL_CTL_ADD, STDIN_FILENO, &ev) == -1)
231	sysadm	1.14	{
232	sysadm	1.29	log_error("epoll_ctl(STDIN_FILENO) error (%d)\n", errno);
233	sysadm	1.31
234			if (close(epollfd) < 0)
235			{
236			log_error("close(epoll) error (%d)\n");
237			}
238	sysadm	1.29	return -1;
239			}
240	sysadm	1.9
241	sysadm	1.29	flags = fcntl(STDIN_FILENO, F_GETFL, 0);
242			fcntl(STDIN_FILENO, F_SETFL, flags \| O_NONBLOCK);
243	sysadm	1.9
244	sysadm	1.31	loop = 1;
245
246			while (loop && pos >= len && !SYS_server_exit)
247	sysadm	1.29	{
248	sysadm	1.31	len = 0;
249			pos = 0;
250
251			nfds = epoll_wait(epollfd, events, MAX_EVENTS, timeout);
252	sysadm	1.9
253	sysadm	1.29	if (nfds < 0)
254	sysadm	1.14	{
255	sysadm	1.21	if (errno != EINTR)
256			{
257	sysadm	1.29	log_error("epoll_wait() error (%d)\n", errno);
258	sysadm	1.31	break;
259	sysadm	1.21	}
260			continue;
261	sysadm	1.14	}
262	sysadm	1.31	else if (nfds == 0) // timeout
263	sysadm	1.14	{
264	sysadm	1.31	out = KEY_TIMEOUT;
265			break;
266	sysadm	1.14	}
267	sysadm	1.21
268	sysadm	1.29	for (int i = 0; i < nfds; i++)
269	sysadm	1.14	{
270	sysadm	1.29	if (events[i].data.fd == STDIN_FILENO)
271	sysadm	1.26	{
272	sysadm	1.31	while (len < sizeof(buf) && !SYS_server_exit) // read until complete or error
273	sysadm	1.26	{
274	sysadm	1.31	ret = (int)read(STDIN_FILENO, buf + len, sizeof(buf) - (size_t)len);
275			if (ret < 0)
276	sysadm	1.29	{
277			if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
278			{
279	sysadm	1.31	loop = 0;
280			break;
281	sysadm	1.29	}
282			else if (errno == EINTR)
283			{
284			continue;
285			}
286			else
287			{
288			log_error("read(STDIN) error (%d)\n", errno);
289	sysadm	1.31	loop = 0;
290			break;
291	sysadm	1.29	}
292			}
293	sysadm	1.31	else if (ret == 0) // broken pipe
294	sysadm	1.29	{
295	sysadm	1.31	loop = 0;
296			break;
297			}
298			else
299			{
300			len += ret;
301			continue;
302	sysadm	1.29	}
303	sysadm	1.26	}
304			}
305	sysadm	1.14	}
306
307			// For debug
308			// for (j = 0; j < len; j++)
309			// log_std ("<--[%u]\n", (buf[j] + 256) % 256);
310	sysadm	1.11	}
311	sysadm	1.14
312	sysadm	1.29	fcntl(STDIN_FILENO, F_SETFL, flags);
313
314	sysadm	1.14	while (pos < len)
315	sysadm	1.11	{
316	sysadm	1.18	unsigned char c = buf[pos++];
317	sysadm	1.5
318	sysadm	1.14	if (c == KEY_CONTROL)
319			{
320			if (in_control == 0)
321			{
322			in_control = 1;
323			i = 0;
324			continue;
325			}
326			}
327	sysadm	1.1
328	sysadm	1.14	if (in_control)
329			{
330			tmp[i++] = c;
331			if (i >= 2)
332			{
333			out = (int)tmp[0] * 256 + tmp[1];
334			in_control = 0;
335			break;
336			}
337			continue;
338			}
339	sysadm	1.6
340	sysadm	1.14	if (c == ESC_KEY)
341			{
342			if (in_esc == 0)
343			{
344			in_esc = 1;
345			in_ascii = 1;
346			i = 0;
347			continue;
348			}
349			else
350			{
351			out = ESC_KEY;
352			in_esc = 0;
353			break;
354			}
355			}
356	sysadm	1.3
357	sysadm	1.14	in_esc = 0;
358	sysadm	1.1
359	sysadm	1.14	if (in_ascii)
360			{
361			tmp[i++] = c;
362			if (c == 'm')
363			{
364			in_ascii = 0;
365			continue;
366			}
367			if (i == 2 && c >= 'A' && c <= 'D')
368			{
369			in_ascii = 0;
370			switch (c)
371			{
372			case 'A':
373			out = KEY_UP;
374			break;
375			case 'B':
376			out = KEY_DOWN;
377			break;
378			case 'C':
379			out = KEY_RIGHT;
380			break;
381			case 'D':
382			out = KEY_LEFT;
383			break;
384			}
385			break;
386			}
387			if (i == 3 && tmp[0] == 91 && tmp[2] == 126)
388			{
389			in_ascii = 0;
390			switch (tmp[1])
391			{
392			case 49:
393			out = KEY_HOME;
394			break;
395			case 51:
396			out = KEY_DEL;
397			break;
398			case 52:
399			out = KEY_END;
400			break;
401			case 53:
402			out = KEY_PGUP;
403			break;
404			case 54:
405			out = KEY_PGDN;
406			break;
407			}
408			break;
409			}
410			continue;
411			}
412	sysadm	1.1
413	sysadm	1.14	out = ((int)c + 256) % 256;
414			break;
415	sysadm	1.1	}
416
417	sysadm	1.14	// for debug
418			// log_std ("-->[%u]\n", out);
419	sysadm	1.1
420	sysadm	1.31	if (close(epollfd) < 0)
421			{
422			log_error("close(epoll) error (%d)\n");
423			}
424
425	sysadm	1.14	return out;
426	sysadm	1.1	}
427	sysadm	1.5
428	sysadm	1.31	int igetch_t(int sec)
429	sysadm	1.9	{
430	sysadm	1.14	int ch;
431			time_t t_begin = time(0);
432	sysadm	1.10
433	sysadm	1.14	do
434			{
435	sysadm	1.31	ch = igetch(100);
436	sysadm	1.25	} while (!SYS_server_exit && ch == KEY_TIMEOUT && (time(0) - t_begin < sec));
437	sysadm	1.9
438	sysadm	1.14	return ch;
439	sysadm	1.9	}
440	sysadm	1.31
441			void igetch_reset()
442			{
443			int ch;
444			do
445			{
446			ch = igetch(0);
447			} while (ch != KEY_NULL && ch != KEY_TIMEOUT);
448			}
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