| 1 | /* $OpenBSD: input.c,v 1.12 2005/04/13 02:33:08 deraadt Exp $ */
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| 2 | /* $NetBSD: input.c,v 1.3 1996/02/06 22:47:33 jtc Exp $ */
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| 3 |
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| 4 | /*-
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| 5 | * Copyright (c) 1992, 1993
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| 6 | * The Regents of the University of California. All rights reserved.
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| 7 | *
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| 8 | * This code is derived from software contributed to Berkeley by
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| 9 | * Chris Torek and Darren F. Provine.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without
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| 12 | * modification, are permitted provided that the following conditions
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| 13 | * are met:
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| 14 | * 1. Redistributions of source code must retain the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | * 3. Neither the name of the University nor the names of its contributors
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| 20 | * may be used to endorse or promote products derived from this software
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| 21 | * without specific prior written permission.
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| 22 | *
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 33 | * SUCH DAMAGE.
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| 34 | *
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| 35 | * @(#)input.c 8.1 (Berkeley) 5/31/93
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| 36 | */
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| 37 |
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| 38 | /** @addtogroup top
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| 39 | * @{
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| 40 | */
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| 41 | /** @file
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| 42 | */
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| 43 |
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| 44 | /*
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| 45 | * Top input.
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| 46 | */
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| 47 |
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| 48 | #include <sys/types.h>
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| 49 | #include <sys/time.h>
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| 50 | #include <stdio.h>
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| 51 |
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| 52 | #include <stdlib.h>
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| 53 | #include <errno.h>
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| 54 | #include <unistd.h>
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| 55 | #include <str.h>
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| 56 |
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| 57 | #include "input.h"
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| 58 |
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| 59 | #include <async.h>
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| 60 | #include <vfs/vfs.h>
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| 61 | #include <io/console.h>
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| 62 | #include <ipc/console.h>
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| 63 |
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| 64 | #define USEC_COUNT 1000000
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| 65 |
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| 66 | /* return true iff the given timeval is positive */
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| 67 | #define TV_POS(tv) \
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| 68 | ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))
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| 69 |
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| 70 | /* subtract timeval `sub' from `res' */
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| 71 | #define TV_SUB(res, sub) \
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| 72 | (res)->tv_sec -= (sub)->tv_sec; \
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| 73 | (res)->tv_usec -= (sub)->tv_usec; \
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| 74 | if ((res)->tv_usec < 0) { \
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| 75 | (res)->tv_usec += 1000000; \
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| 76 | (res)->tv_sec--; \
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| 77 | }
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| 78 |
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| 79 | /* We will use a hack here - if lastchar is non-zero, it is
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| 80 | * the last character read. We will somehow simulate the select
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| 81 | * semantics.
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| 82 | */
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| 83 | static aid_t getchar_inprog = 0;
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| 84 | static char lastchar = '\0';
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| 85 |
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| 86 | /*
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| 87 | * Do a `read wait': select for reading from stdin, with timeout *tvp.
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| 88 | * On return, modify *tvp to reflect the amount of time spent waiting.
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| 89 | * It will be positive only if input appeared before the time ran out;
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| 90 | * otherwise it will be zero or perhaps negative.
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| 91 | *
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| 92 | * If tvp is nil, wait forever, but return if select is interrupted.
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| 93 | *
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| 94 | * Return 0 => no input, 1 => can read() from stdin
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| 95 | *
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| 96 | */
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| 97 | int rwait(struct timeval *tvp)
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| 98 | {
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| 99 | struct timeval starttv, endtv, *s;
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| 100 | static ipc_call_t charcall;
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| 101 | sysarg_t rc;
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| 102 |
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| 103 | /*
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| 104 | * Someday, select() will do this for us.
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| 105 | * Just in case that day is now, and no one has
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| 106 | * changed this, we use a temporary.
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| 107 | */
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| 108 | if (tvp) {
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| 109 | (void) gettimeofday(&starttv, NULL);
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| 110 | endtv = *tvp;
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| 111 | s = &endtv;
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| 112 | } else
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| 113 | s = NULL;
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| 114 |
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| 115 | if (!lastchar) {
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| 116 | again:
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| 117 | if (!getchar_inprog) {
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| 118 | getchar_inprog = async_send_0(fphone(stdin),
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| 119 | CONSOLE_GET_EVENT, &charcall);
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| 120 | }
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| 121 |
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| 122 | if (!s)
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| 123 | async_wait_for(getchar_inprog, &rc);
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| 124 | else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {
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| 125 | tvp->tv_sec = 0;
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| 126 | tvp->tv_usec = 0;
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| 127 | return (0);
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| 128 | }
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| 129 |
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| 130 | getchar_inprog = 0;
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| 131 | if (rc) {
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| 132 | printf("End of file, bug?\n");
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| 133 | exit(1);
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| 134 | }
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| 135 |
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| 136 | if (IPC_GET_ARG1(charcall) == KEY_RELEASE)
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| 137 | goto again;
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| 138 |
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| 139 | lastchar = IPC_GET_ARG4(charcall);
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| 140 | }
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| 141 |
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| 142 | if (tvp) {
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| 143 | /* since there is input, we may not have timed out */
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| 144 | (void) gettimeofday(&endtv, NULL);
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| 145 | TV_SUB(&endtv, &starttv);
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| 146 | TV_SUB(tvp, &endtv); /* adjust *tvp by elapsed time */
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| 147 | }
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| 148 |
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| 149 | return 1;
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| 150 | }
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| 151 |
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| 152 | /*
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| 153 | * `sleep' for the current turn time (using select).
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| 154 | * Eat any input that might be available.
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| 155 | */
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| 156 | void tsleep(unsigned int sec)
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| 157 | {
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| 158 | struct timeval tv;
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| 159 |
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| 160 | tv.tv_sec = 0;
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| 161 | tv.tv_usec = sec * USEC_COUNT;
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| 162 | while (TV_POS(&tv))
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| 163 | if (rwait(&tv)) {
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| 164 | lastchar = '\0';
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| 165 | } else
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| 166 | break;
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| 167 | }
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| 168 |
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| 169 | /*
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| 170 | * getchar with timeout.
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| 171 | */
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| 172 | int tgetchar(unsigned int sec)
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| 173 | {
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| 174 | static struct timeval timeleft;
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| 175 | char c;
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| 176 |
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| 177 | /*
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| 178 | * Reset timeleft to USEC_COUNT whenever it is not positive.
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| 179 | * In any case, wait to see if there is any input. If so,
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| 180 | * take it, and update timeleft so that the next call to
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| 181 | * tgetchar() will not wait as long. If there is no input,
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| 182 | * make timeleft zero or negative, and return -1.
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| 183 | *
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| 184 | * Most of the hard work is done by rwait().
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| 185 | */
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| 186 | if (!TV_POS(&timeleft)) {
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| 187 | timeleft.tv_sec = 0;
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| 188 | timeleft.tv_usec = sec * USEC_COUNT;
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| 189 | }
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| 190 |
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| 191 | if (!rwait(&timeleft))
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| 192 | return -1;
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| 193 |
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| 194 | c = lastchar;
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| 195 | lastchar = '\0';
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| 196 | return ((int) (unsigned char) c);
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| 197 | }
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| 198 |
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| 199 | /** @}
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| 200 | */
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