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>
28 #include <sys/types.h>
46 #define LWP_KEYSTROKE_DELAY 250 /* 250ms. Must be < 1000 */
47 #define LWP_MAXLINELEN 256
50 /* LWP_WaitForKeystroke : Wait until a key has been struck or time (secconds)
51 * runs out and return to caller. The NT version of this function will return
52 * immediately after a key has been pressed (doesn't wait for cr).
54 * seconds: wait for <seconds> seconds before returning. If seconds < 0,
57 * 1: Keyboard input available
58 * 0: seconds elapsed. Timeout.
60 int LWP_WaitForKeystroke(int seconds)
62 time_t startTime, nowTime;
69 twait.tv_usec = LWP_KEYSTROKE_DELAY;
76 /* check if we have a keystroke */
83 /* sleep for LWP_KEYSTROKE_DELAY ms and let other
85 IOMGR_Select(0, 0, 0, 0, &twait);
87 if (seconds > 0) { /* we only worry about elapsed time if
88 * not looping forever (seconds < 0) */
89 /* now check elapsed time */
91 timeleft = seconds - difftime(nowTime, startTime);
99 /* LWP_GetLine() - Waits indefinitely until a newline has been typed
100 * and then returns the line typed.
102 * This is trivial in unix, but requires some processing on NT.
103 * we basically read all chars into a buffer until we hit a newline and
104 * then return it to the user.
106 * n - a whole line has been read.(has n chars)
107 * 0 - buf not big enough.
108 * -1 - line with only EOF
111 int LWP_GetLine(char *linebuf, int len)
117 /* loop until a new line has been entered */
118 while (ch != '\r' && cnt < len-1)
120 LWP_WaitForKeystroke(-1);
123 if ((ch == EOF) && (cnt == 0))
126 if (ch == '\b') {/* print and throw away a backspace */
127 if (!cnt) /* if we are at the start of the line don't bspace */
129 /* print a space to delete char and move cursor back */
139 if (ch == '\r') { /* got a cr. translate to nl */
140 linebuf[cnt-1] = '\n';
145 else { /* buffer too small */
152 /* LWP_WaitForKeystroke(Unix) :Wait until a key has been struck or time (secconds)
153 * runs out and return to caller. The Unix version will actually wait until
154 * a <cr> has been entered before returning.
156 * seconds: wait for <seconds> seconds before returning. If seconds < 0,
159 * 1: Keyboard input available
160 * 0: seconds elapsed. Timeout.
162 int LWP_WaitForKeystroke(int seconds)
166 struct timeval twait;
167 struct timeval *tp = NULL;
169 #ifndef AFS_DJGPP_ENV
170 #ifdef AFS_LINUX20_ENV
171 if (stdin->_IO_read_ptr < stdin->_IO_read_end)
174 #if defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
175 if (stdin->_bf._size > 0)
188 FD_SET(fileno(stdin), &rdfds);
191 twait.tv_sec = seconds;
196 code = IOMGR_Select(1+fileno(stdin), &rdfds, NULL, NULL, tp);
198 return (code == 1) ? 1 : 0;
201 /* LWP_GetLine() - Waits indefinitely until a newline has been typed
202 * and then returns the line typed.
204 * This is trivial in unix, but requires some processing on NT.
205 * we basically read all chars into a buffer until we hit a newline and
206 * then return it to the user.
208 * n - a whole line has been read.(has n chars)
209 * 0 - buf not big enough.
210 * -1 - line with only EOF
213 int LWP_GetLine(char *linebuf, int len)
218 LWP_WaitForKeystroke(-1);
220 s = fgets(linebuf, len, stdin);
221 if (s == NULL) return -1;
223 linelen = strlen(linebuf);
224 if (linebuf[linelen-1] != '\n') /* buffer too small */
230 #endif /* else NT40*/
232 /* LWP_GetResponseKey() - Waits for a specified period of time and
233 * returns a char when one has been typed by the user.
235 * seconds - how long to wait for a key press.
236 * *key - char entered by user
238 * 0 - Time ran out before the user typed a key.
239 * 1 - Valid char is being returned.
242 int LWP_GetResponseKey(int seconds, char *key)
247 return 0; /* need space to store char */
250 fflush(stdin); /* flush all existing data and start anew */
253 rc = LWP_WaitForKeystroke(seconds);
254 if (rc == 0) { /* time ran out */
259 /* now read the char. */
261 *key = getche(); /* get char and echo it to screen */
263 *key = (char ) getchar();