2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * LWP_WaitForKeystroke - wait indefinitely or for a specified number of
12 * seconds for keyboard input.
14 * If seconds < 0, LWP_WaitForKeystroke will wait indefinitely.
15 * If seconds == 0, LWP_WaitForKeystroke will just determine if data is now
17 * Otherwise, wait "seconds" for data.
19 * Return 1 if data available.
22 #include <afsconfig.h>
23 #include <afs/param.h>
27 #include <sys/types.h>
39 #define LWP_KEYSTROKE_DELAY 250 /* 250ms. Must be < 1000 */
40 #define LWP_MAXLINELEN 256
43 /* LWP_WaitForKeystroke : Wait until a key has been struck or time (secconds)
44 * runs out and return to caller. The NT version of this function will return
45 * immediately after a key has been pressed (doesn't wait for cr).
47 * seconds: wait for <seconds> seconds before returning. If seconds < 0,
50 * 1: Keyboard input available
51 * 0: seconds elapsed. Timeout.
54 LWP_WaitForKeystroke(int seconds)
56 time_t startTime, nowTime;
63 twait.tv_usec = LWP_KEYSTROKE_DELAY;
69 /* check if we have a keystroke */
76 /* sleep for LWP_KEYSTROKE_DELAY ms and let other
78 IOMGR_Select(0, 0, 0, 0, &twait);
80 if (seconds > 0) { /* we only worry about elapsed time if
81 * not looping forever (seconds < 0) */
82 /* now check elapsed time */
84 timeleft = seconds - difftime(nowTime, startTime);
92 /* LWP_GetLine() - Waits indefinitely until a newline has been typed
93 * and then returns the line typed.
95 * This is trivial in unix, but requires some processing on NT.
96 * we basically read all chars into a buffer until we hit a newline and
97 * then return it to the user.
99 * n - a whole line has been read.(has n chars)
100 * 0 - buf not big enough.
101 * -1 - line with only EOF
105 LWP_GetLine(char *linebuf, int len)
111 /* loop until a new line has been entered */
112 while (ch != '\r' && cnt < len - 1) {
113 LWP_WaitForKeystroke(-1);
116 if ((ch == EOF) && (cnt == 0))
119 if (ch == '\b') { /* print and throw away a backspace */
120 if (!cnt) /* if we are at the start of the line don't bspace */
122 /* print a space to delete char and move cursor back */
131 if (ch == '\r') { /* got a cr. translate to nl */
132 linebuf[cnt - 1] = '\n';
136 } else { /* buffer too small */
143 /* LWP_WaitForKeystroke(Unix) :Wait until a key has been struck or time (secconds)
144 * runs out and return to caller. The Unix version will actually wait until
145 * a <cr> has been entered before returning.
147 * seconds: wait for <seconds> seconds before returning. If seconds < 0,
150 * 1: Keyboard input available
151 * 0: seconds elapsed. Timeout.
154 LWP_WaitForKeystroke(int seconds)
158 struct timeval twait;
159 struct timeval *tp = NULL;
161 #ifdef AFS_LINUX20_ENV
162 if (stdin->_IO_read_ptr < stdin->_IO_read_end)
165 #if defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
166 #if defined(AFS_DFBSD_ENV)
168 unsigned char *_base;
173 struct __FILE_public pub;
174 struct appx_sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
176 struct APPX_FILE *appx_stdin = (struct APPX_FILE *) stdin;
177 if (appx_stdin->_bf._size > 0)
180 if (stdin->_bf._size > 0)
190 FD_SET(fileno(stdin), &rdfds);
193 twait.tv_sec = seconds;
198 code = IOMGR_Select(1 + fileno(stdin), &rdfds, NULL, NULL, tp);
200 return (code == 1) ? 1 : 0;
203 /* LWP_GetLine() - Waits indefinitely until a newline has been typed
204 * and then returns the line typed.
206 * This is trivial in unix, but requires some processing on NT.
207 * we basically read all chars into a buffer until we hit a newline and
208 * then return it to the user.
210 * n - a whole line has been read.(has n chars)
211 * 0 - buf not big enough.
212 * -1 - line with only EOF
216 LWP_GetLine(char *linebuf, int len)
221 LWP_WaitForKeystroke(-1);
223 s = fgets(linebuf, len, stdin);
227 linelen = strlen(linebuf);
228 if (linebuf[linelen - 1] != '\n') /* buffer too small */
234 #endif /* else NT40 */
236 /* LWP_GetResponseKey() - Waits for a specified period of time and
237 * returns a char when one has been typed by the user.
239 * seconds - how long to wait for a key press.
240 * *key - char entered by user
242 * 0 - Time ran out before the user typed a key.
243 * 1 - Valid char is being returned.
247 LWP_GetResponseKey(int seconds, char *key)
252 return 0; /* need space to store char */
255 fflush(stdin); /* flush all existing data and start anew */
258 rc = LWP_WaitForKeystroke(seconds);
259 if (rc == 0) { /* time ran out */
264 /* now read the char. */
266 *key = getche(); /* get char and echo it to screen */
268 *key = (char)getchar();