/* q_get returns a pointer to the buffer where data is read or NULL if
* buffer is empty.
*/
static Byte *q_get(int sockfd, QTYPE *queue) {
int emptySpace = EmptySpace(*queue);
if (emptySpace < RXQSIZE) {
/*
Retrieve data from buffer
If the number of characters in the receive buffer is below certain
level, then send XON.
Increment front index and check for wraparound.
*/
if ( ( emptySpace >= maxLowerLimit ) && ( x == 0 ) ) {
char state[1];
printf("Buffer < maximum lowerlimit. Mengirim XON.\n");
sprintf(state, "%c",(char) XON);
if (sendto(sockfd, state, 1, 0, (struct sockaddr *)&targetAddr, addrLen)==-1) {
perror("sendto");
}
x = 1;
sleep(5);
return NULL;
} else {
consumed[0] = Del(queue);
while ( !(consumed[0] >= 32 || consumed[0] == 13 || consumed[0] == 10) && EmptySpace(*queue) > 0 ) {
consumed[0] = Del(queue);
}
return consumed;
}
} else {
/* Nothing in the queue */
return NULL;
}
}
void DrawMaze (int height, int width, int **Maze, int ascii)
{
int i, j;
printf("newpath 100 200 moveto\n");
printf("%d 0 rlineto 0 %d rlineto \n", width*TILESIZE, height*TILESIZE);
printf("-%d 0 rlineto 0 -%d rlineto \n", width*TILESIZE, height*TILESIZE);
printf("stroke closepath\n\nnewpath\n 100 %d moveto\n", 200+height*TILESIZE);
for(i=0;i<width;i++){
for(j=0; j<height;j++){
if(!ascii){printf("%% ");}
printf("%d ",Maze[i][j]);
}
printf("\n");
}
for(i=0;i<width;i++){
for(j=0; j<height;j++){
if(!ascii){
switch(Maze[i][j]){
case RIGHTWALL:
Rightwall(i+j);
break;
case LEFTWALL:
Leftwall(i+j);
break;
case UPWALL:
Upwall(i+j);
break;
case DOWNWALL:
Downwall(i+j);
break;
default:
EmptySpace(i+j);
break;
}
}
}
printf("\t%%New level\n\t %d -%d rmoveto\n",-width*TILESIZE,TILESIZE);
}
printf("closepath stroke showpage");
return;
}
static Byte *rcvchar(int sockfd, QTYPE* queue) {
/*
Read a character from socket and put it to the receive buffer.
If the number of characters in the receive buffer is above certain
level, then send XOFF and set a flag.
Return a buffer value.
*/
int emptySpace = EmptySpace(*queue);
if (emptySpace <= minUpperLimit) {
char state[1];
printf("Buffer > minimum upperlimit. Mengirim XOFF.\n");
sprintf(state, "%c",(char) XOFF);
if (sendto(sockfd, state, 1, 0, (struct sockaddr *)&targetAddr, addrLen) == -1) {
perror("sendto");
}
x = 0;
sleep(5);
return NULL;
} else {
recvLen = recvfrom(sockfd, buf, 1, 0, (struct sockaddr *)&targetAddr, &addrLen);
if ( buf[0] != 26 ) {
Add(queue, buf[0]);
}
return buf;
}
}
