int fgetc_button(Stream *stream) {
if (stream->device_instance == BUTTON_SW1) {
if (sw1In()) {
/* wait until button released before checking if pushed again */
while(sw1In()) { ; }
return 1;
}
return 0;
}
if (stream->device_instance == BUTTON_SW2) {
if (sw2In()) {
/* wait until button released before checking if pushed again */
while(sw2In()) { ; }
return 1;
}
return 0;
}
return INVALID_BUTTON;
}
/*
* Implements read interface.
* Parameters:
* o void *fp - stream to read.
* o char* buff - character read into buff.
* Return : Number of bytes read
*/
int btn_read(void *fp,char* buff)
{
struct btn_stream* stream = (struct btn_stream*)fp;
int result = 0;
switch(stream->minor)
{
case ONE:
result = sw1In();
break;
case TWO:
result = sw2In();
break;
default:
return 0;
}
*buff = (result > 0) ? '1' : '0';
return 1;
}