-> On Sun, 04 Oct 1998 03:51:10 +0900,
-> "Niko D. Barli" <[EMAIL PROTECTED]>
-> in message ::: Re: [id-linux] KEYPRESSED/KBHIT() pada GCC ? ::: wrote,
>> Baru ketemu nih caranya mengganti kbhit() pake standard C library,
>> nggak jamin benar 100 %, tapi yang pasti "kelihatannya" jalan.
>> ini contoh programnya.
>>
>> #include <termios.h>
>> #include <unistd.h>
>> #include <stdio.h>
>>
>> /* How to implement if(kbhit()){ do something } */
>>
>> int main(){
>> struct termios old_attr, attr;
>> int c;
>>
>> /* save termios old attribute */
>> if((tcgetattr)(STDIN_FILENO, &old_attr) < 0){
>> exit(-1);
>> }
>>
>> /* set new attribute */
>> attr = old_attr;
>> attr.c_lflag &= ~(ICANON | ECHO); /* no buffering and no echoing */
>> if((tcsetattr)(STDIN_FILENO,TCSAFLUSH,&attr) < 0){
>> exit(-1);
>> }
>>
>> /* get a character */
>> c = getchar();
>> /* and restore it back before leaving */
>> ungetc(c, stdin);
>>
>> /* restore old attributes */
>> if((tcsetattr)(STDIN_FILENO,TCSAFLUSH,&old_attr) < 0){
>> exit(-1);
>> }
>>
>>
>> /* do something here */
>>
>>
>> }
Oops, ada yang kelupaan. Program di atas cuma menunjukkan cara
mematikan fungsi line buffering dari stdin. Untuk meng-emulasi kbhit()
perlu pake select(). (Mungkin ada cara lebih sederhana ?)
program yang benar :
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <termios.h>
#include <unistd.h>
#include <stdio.h>
/* if(kbhit()){ do something } */
int main(){
struct timeval polltime;
fd_set in, inset;
struct termios old_attr, attr;
int c;
/* save termios old attribute */
if((tcgetattr)(STDIN_FILENO, &old_attr) < 0){
exit(-1);
}
/* set new attribute */
attr = old_attr;
attr.c_lflag &= ~(ICANON | ECHO); /* no buffering and no echoing */
if((tcsetattr)(STDIN_FILENO,TCSAFLUSH,&attr) < 0){
exit(-1);
}
FD_ZERO(&in);
FD_SET(STDIN_FILENO, &in);
do{
polltime.tv_sec = 0; /* set time to 0 */
polltime.tv_usec = 0; /* to polling */
inset = in;
/* if(!kbhit()) do something else here. Restore
termios attributes if needed and don't forget to set
it again before calling select */
printf("a!");
}
while(select(1, &inset, NULL, NULL, &polltime) == 0);
/* restore old attributes */
if((tcsetattr)(STDIN_FILENO,TCSAFLUSH,&old_attr) < 0){
exit(-1);
}
/* do something here */
}
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