| 50,6 → 50,7 |
|---|
| #include "tetris.h" |
| |
| #include <async.h> |
| #include "../console/console.h" |
| |
| /* return true iff the given timeval is positive */ |
| #define TV_POS(tv) \ |
| 64,7 → 65,12 |
|---|
| (res)->tv_sec--; \ |
| } |
| |
| /* We will use a hack here - if lastchar is non-zero, it is |
| * the last character read. We will somehow simulate the select |
| * semantics. |
| */ |
| static aid_t getchar_inprog = 0; |
| static char lastchar = '\0'; |
| |
| /* |
| * Do a `read wait': select for reading from stdin, with timeout *tvp. |
| 75,12 → 81,14 |
|---|
| * If tvp is nil, wait forever, but return if select is interrupted. |
| * |
| * Return 0 => no input, 1 => can read() from stdin |
| * |
| */ |
| int |
| rwait(struct timeval *tvp) |
| { |
| struct timeval starttv, endtv, *s; |
| fd_set fds; |
| static ipc_call_t charcall; |
| int rc; |
| |
| #define NILTZ ((struct timezone *)0) |
| |
| 96,22 → 104,19 |
|---|
| } else |
| s = NULL; |
| again: |
| FD_ZERO(&fds); |
| FD_SET(STDIN_FILENO, &fds); |
| switch (select(STDIN_FILENO + 1, &fds, (fd_set *)0, (fd_set *)0, s)) { |
| |
| case -1: |
| if (tvp == 0) |
| return (-1); |
| if (errno == EINTR) |
| goto again; |
| stop("select failed, help"); |
| /* NOTREACHED */ |
| |
| case 0: /* timed out */ |
| tvp->tv_sec = 0; |
| tvp->tv_usec = 0; |
| return (0); |
| if (!lastchar) { |
| if (!getchar_inprog) |
| getchar_inprog = async_send_2(1,CONSOLE_GETCHAR,0,0,&charcall); |
| if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) { |
| tvp->tv_sec = 0; |
| tvp->tv_usec = 0; |
| return (0); |
| } |
| getchar_inprog = 0; |
| if (rc) { |
| stop("end of file, help"); |
| } |
| lastchar = IPC_GET_ARG1(charcall); |
| } |
| if (tvp) { |
| /* since there is input, we may not have timed out */ |
| 135,7 → 140,9 |
|---|
| tv.tv_sec = 0; |
| tv.tv_usec = fallrate; |
| while (TV_POS(&tv)) |
| if (rwait(&tv) && read(STDIN_FILENO, &c, 1) != 1) |
| if (rwait(&tv)) { |
| lastchar = '\0'; |
| } else |
| break; |
| } |
| |
| 164,7 → 171,7 |
|---|
| } |
| if (!rwait(&timeleft)) |
| return (-1); |
| if (read(STDIN_FILENO, &c, 1) != 1) |
| stop("end of file, help"); |
| c = lastchar; |
| lastchar = '\0'; |
| return ((int)(unsigned char)c); |
| } |