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 <afs/param.h>
23 #include <afsconfig.h>
28 #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.
53 int LWP_WaitForKeystroke(int seconds)
55 time_t startTime, nowTime;
62 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.
103 int LWP_GetLine(char *linebuf, int len)
109 /* loop until a new line has been entered */
110 while (ch != '\r' && cnt < len-1)
112 LWP_WaitForKeystroke(-1);
114 if (ch == '\b') {/* print and throw away a backspace */
115 if (!cnt) /* if we are at the start of the line don't bspace */
117 /* print a space to delete char and move cursor back */
127 if (ch == '\r') { /* got a cr. translate to nl */
128 linebuf[cnt-1] = '\n';
133 else { /* buffer too small */
140 /* LWP_WaitForKeystroke(Unix) :Wait until a key has been struck or time (secconds)
141 * runs out and return to caller. The Unix version will actually wait until
142 * a <cr> has been entered before returning.
144 * seconds: wait for <seconds> seconds before returning. If seconds < 0,
147 * 1: Keyboard input available
148 * 0: seconds elapsed. Timeout.
150 int LWP_WaitForKeystroke(int seconds)
154 struct timeval twait;
155 struct timeval *tp = NULL;
157 #ifndef AFS_DJGPP_ENV
158 #ifdef AFS_LINUX20_ENV
159 if (stdin->_IO_read_ptr < stdin->_IO_read_end)
162 #if defined(AFS_DARWIN_ENV) || defined(AFS_FBSD_ENV)
163 if (stdin->_bf._size > 0)
176 FD_SET(fileno(stdin), &rdfds);
179 twait.tv_sec = seconds;
184 code = IOMGR_Select(1+fileno(stdin), &rdfds, NULL, NULL, tp);
186 return (code == 1) ? 1 : 0;
189 /* LWP_GetLine() - Waits indefinitely until a newline has been typed
190 * and then returns the line typed.
192 * This is trivial in unix, but requires some processing on NT.
193 * we basically read all chars into a buffer until we hit a newline and
194 * then return it to the user.
196 * n - a whole line has been read.(has n chars)
197 * 0 - buf not big enough.
200 int LWP_GetLine(char *linebuf, int len)
204 LWP_WaitForKeystroke(-1);
206 fgets(linebuf, len, stdin);
207 linelen = strlen(linebuf);
208 if (linebuf[linelen-1] != '\n') /* buffer too small */
214 #endif /* else NT40*/
216 /* LWP_GetResponseKey() - Waits for a specified period of time and
217 * returns a char when one has been typed by the user.
219 * seconds - how long to wait for a key press.
220 * *key - char entered by user
222 * 0 - Time ran out before the user typed a key.
223 * 1 - Valid char is being returned.
226 int LWP_GetResponseKey(int seconds, char *key)
231 return 0; /* need space to store char */
234 fflush(stdin); /* flush all existing data and start anew */
237 rc = LWP_WaitForKeystroke(seconds);
238 if (rc == 0) { /* time ran out */
243 /* now read the char. */
245 *key = getche(); /* get char and echo it to screen */