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34
 *
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 *
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 *  @(#)input.c 8.1 (Berkeley) 5/31/93
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 *  @(#)input.c 8.1 (Berkeley) 5/31/93
36
 */
36
 */
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37
 
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/** @addtogroup tetris
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/** @addtogroup tetris
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 * @{
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 * @{
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 */
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 */
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/** @file
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/** @file
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 */
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 */
43
 
43
 
44
/*
44
/*
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#include "input.h"
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#include "input.h"
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#include "tetris.h"
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#include "tetris.h"
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58
 
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#include <async.h>
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#include <async.h>
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#include <vfs/vfs.h>
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#include <io/console.h>
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#include <ipc/console.h>
62
#include <ipc/console.h>
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#include <console.h>
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#include <kbd/kbd.h>
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63
 
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/* return true iff the given timeval is positive */
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/* return true iff the given timeval is positive */
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#define TV_POS(tv) \
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#define TV_POS(tv) \
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    ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))
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    ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))
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 * If tvp is nil, wait forever, but return if select is interrupted.
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 * If tvp is nil, wait forever, but return if select is interrupted.
91
 *
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 *
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 * Return 0 => no input, 1 => can read() from stdin
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 * Return 0 => no input, 1 => can read() from stdin
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 *
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 *
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 */
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 */
95
int
-
 
96
rwait(struct timeval *tvp)
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int rwait(struct timeval *tvp)
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{
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{
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    struct timeval starttv, endtv, *s;
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    struct timeval starttv, endtv, *s;
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    static ipc_call_t charcall;
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    static ipc_call_t charcall;
100
    ipcarg_t rc;
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    ipcarg_t rc;
101
    int cons_phone;
-
 
102
 
100
   
103
    /*
101
    /*
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     * Someday, select() will do this for us.
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     * Someday, select() will do this for us.
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     * Just in case that day is now, and no one has
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     * Just in case that day is now, and no one has
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     * changed this, we use a temporary.
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     * changed this, we use a temporary.
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     */
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     */
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        (void) gettimeofday(&starttv, NULL);
107
        (void) gettimeofday(&starttv, NULL);
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        endtv = *tvp;
108
        endtv = *tvp;
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        s = &endtv;
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        s = &endtv;
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    } else
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    } else
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        s = NULL;
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        s = NULL;
114
 
112
   
115
    if (!lastchar) {
113
    if (!lastchar) {
116
again:
114
again:
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        if (!getchar_inprog) {
115
        if (!getchar_inprog) {
118
            cons_phone = console_open(true);
-
 
119
            getchar_inprog = async_send_2(cons_phone,
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            getchar_inprog = async_send_0(fphone(stdin),
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                CONSOLE_GETKEY, 0, 0, &charcall);
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                CONSOLE_GET_EVENT, &charcall);
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        }
118
        }
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122
        if (!s)
120
        if (!s)
123
            async_wait_for(getchar_inprog, &rc);
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            async_wait_for(getchar_inprog, &rc);
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        else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {
122
        else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {
125
            tvp->tv_sec = 0;
123
            tvp->tv_sec = 0;
126
            tvp->tv_usec = 0;
124
            tvp->tv_usec = 0;
127
            return (0);
125
            return (0);
128
        }
126
        }
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127
       
129
        getchar_inprog = 0;
128
        getchar_inprog = 0;
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        if (rc) {
129
        if (rc)
131
            stop("end of file, help");
130
            stop("end of file, help");
132
        }
131
       
133
        if (IPC_GET_ARG1(charcall) == KE_RELEASE)
132
        if (IPC_GET_ARG1(charcall) == KEY_RELEASE)
134
            goto again;
133
            goto again;
135
 
134
       
136
        lastchar = IPC_GET_ARG4(charcall);
135
        lastchar = IPC_GET_ARG4(charcall);
137
    }
136
    }
-
 
137
   
138
    if (tvp) {
138
    if (tvp) {
139
        /* since there is input, we may not have timed out */
139
        /* since there is input, we may not have timed out */
140
        (void) gettimeofday(&endtv, NULL);
140
        (void) gettimeofday(&endtv, NULL);
141
        TV_SUB(&endtv, &starttv);
141
        TV_SUB(&endtv, &starttv);
142
        TV_SUB(tvp, &endtv);    /* adjust *tvp by elapsed time */
142
        TV_SUB(tvp, &endtv);  /* adjust *tvp by elapsed time */
143
    }
143
    }
-
 
144
   
144
    return (1);
145
    return 1;
145
}
146
}
146
 
147
 
147
/*
148
/*
148
 * `sleep' for the current turn time (using select).
149
 * `sleep' for the current turn time (using select).
149
 * Eat any input that might be available.
150
 * Eat any input that might be available.
150
 */
151
 */
151
void
-
 
152
tsleep(void)
152
void tsleep(void)
153
{
153
{
154
    struct timeval tv;
154
    struct timeval tv;
155
 
155
   
156
    tv.tv_sec = 0;
156
    tv.tv_sec = 0;
157
    tv.tv_usec = fallrate;
157
    tv.tv_usec = fallrate;
158
    while (TV_POS(&tv))
158
    while (TV_POS(&tv))
159
        if (rwait(&tv)) {
159
        if (rwait(&tv)) {
160
            lastchar = '\0';
160
            lastchar = '\0';
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163
}
163
}
164
 
164
 
165
/*
165
/*
166
 * getchar with timeout.
166
 * getchar with timeout.
167
 */
167
 */
168
int
-
 
169
tgetchar(void)
168
int tgetchar(void)
170
{
169
{
171
    static struct timeval timeleft;
170
    static struct timeval timeleft;
172
    char c;
171
    char c;
173
 
172
   
174
    /*
173
    /*
175
     * Reset timeleft to fallrate whenever it is not positive.
174
     * Reset timeleft to fallrate whenever it is not positive.
176
     * In any case, wait to see if there is any input.  If so,
175
     * In any case, wait to see if there is any input.  If so,
177
     * take it, and update timeleft so that the next call to
176
     * take it, and update timeleft so that the next call to
178
     * tgetchar() will not wait as long.  If there is no input,
177
     * tgetchar() will not wait as long.  If there is no input,
179
     * make timeleft zero or negative, and return -1.
178
     * make timeleft zero or negative, and return -1.
180
     *
179
     *
181
     * Most of the hard work is done by rwait().
180
     * Most of the hard work is done by rwait().
182
     */
181
     */
183
    if (!TV_POS(&timeleft)) {
182
    if (!TV_POS(&timeleft)) {
184
        faster();   /* go faster */
183
        faster();  /* go faster */
185
        timeleft.tv_sec = 0;
184
        timeleft.tv_sec = 0;
186
        timeleft.tv_usec = fallrate;
185
        timeleft.tv_usec = fallrate;
187
    }
186
    }
-
 
187
   
188
    if (!rwait(&timeleft))
188
    if (!rwait(&timeleft))
189
        return (-1);
189
        return -1;
-
 
190
   
190
    c = lastchar;
191
    c = lastchar;
191
    lastchar = '\0';
192
    lastchar = '\0';
192
    return ((int)(unsigned char)c);
193
    return ((int) (unsigned char) c);
193
}
194
}
194
 
195
 
195
/** @}
196
/** @}
196
 */
197
 */
197
 
-