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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include "chess.h"
#include "data.h"
/* last modified 11/19/98 */
/*
*******************************************************************************
* *
* DGTInit() fork()'s a process to handle the DGT chessboard, and then sets *
* up a pipe to communicate with it. *
* *
*******************************************************************************
*/
#if defined(DGT)
void DGTDelayTime(int ms)
{
int oldt, newt;
oldt = ReadClock(elapsed);
do {
newt = ReadClock(elapsed);
} while (newt - ms / 10 < oldt);
}
void DGTInit(int nargs, char *args[])
{
/*
************************************************************
* *
* fork() to spawn a new process, then execve() to execute *
* dgt instead of the cloned copy of crafty created by the *
* fork() call. *
* *
************************************************************
*/
char dgt[] = { "dgt" };
char *argv[5] = { 0, 0, 0, 0, 0 }, *env[2];
int tp[2], fp[2];
char device[] = { "/dev/ttyS0" }, setup[] = {
"lw"};
printf("Executing DGT driver.\n");
argv[0] = dgt;
if (nargs > 1)
argv[1] = args[1];
else
argv[1] = device;
if (nargs > 2)
argv[2] = args[2];
else
argv[2] = setup;
if (nargs > 3)
argv[3] = args[3];
env[0] = dgt;
env[1] = 0;
signal(SIGPIPE, SIG_IGN);
pipe(tp);
pipe(fp);
to_dgt = tp[1];
from_dgt = fp[0];
/*
**************************************************
* *
* child process has to force stdin, stdout and *
* stderr to use the two pipes we just created. *
* *
**************************************************
*/
if (fork() == 0) {
dup2(tp[0], 0);
dup2(fp[1], 1);
close(tp[0]);
close(tp[1]);
close(fp[0]);
close(fp[1]);
dup2(1, fileno(stderr));
execve("dgt", argv, env);
printf("ERROR: unable to execute dgt driver!\n");
exit(1);
}
close(tp[0]);
close(fp[1]);
write(to_dgt, "reset\n", 6);
DGTDelayTime(200);
write(to_dgt, "set\n", 4);
DGTDelayTime(300);
write(to_dgt, "update\n", 7);
DGT_active = 1;
}
/* last modified 11/19/98 */
/*
*******************************************************************************
* *
* DGTRead() reads data from the tty port connected to the DGT electronic *
* chess board and handles all data from that device. *
* *
*******************************************************************************
*/
void DGTRead()
{
static char buffer[512];
char temp[512];
static int bytes = 0;
char *last;
bytes = read(from_dgt, buffer + bytes, 256);
buffer[bytes] = 0;
last = strchr(buffer, '\n');
while (last) {
if (last)
*last = 0;
bytes -= strlen(buffer) + 1;
if (!strncmp(buffer, "move", 4)) {
strcpy(cmd_buffer + strlen(cmd_buffer), buffer + 5);
strcpy(cmd_buffer + strlen(cmd_buffer), "\n");
}
if (!strncmp(buffer, "command", 7)) {
strcpy(cmd_buffer + strlen(cmd_buffer), buffer + 8);
strcpy(cmd_buffer + strlen(cmd_buffer), "\n");
} else if (!strncmp(buffer, "info", 4))
Print(128, "DGT: %s\n", buffer + 4);
strcpy(temp, last + 1);
strcpy(buffer, temp);
last = strchr(buffer, '\n');
}
}
/* last modified 11/20/98 */
/*
*******************************************************************************
* *
* DGTCheckInput() checks to determine if input from the DGT board arrived. *
* *
*******************************************************************************
*/
int DGTCheckInput(void)
{
fd_set readfds;
struct timeval tv;
int data;
FD_ZERO(&readfds);
FD_SET(from_dgt, &readfds);
tv.tv_sec = 0;
tv.tv_usec = 0;
(void) select(32, &readfds, 0, 0, &tv);
data = FD_ISSET(from_dgt, &readfds);
return (data);
}
#endif
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