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Add SerGetBuf() to know if there is available character in serial line buffer, correct serial_keypressed according serial_getchar which is returning 0 if no available character

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Laurent Vivier 2005-08-31 23:32:43 +00:00
parent b1f8a617ce
commit 4e4ab9a082
1 changed files with 26 additions and 4 deletions
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30
second/serial.c
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@ -241,22 +241,44 @@ ssize_t write(int fd, const void *buf, size_t count)
}
#ifdef USE_CLI
static OSErr SerGetBuf(short refNum, long *count)
{
int res;
CntrlParam param;
param.ioCompletion = 0;
param.ioVRefNum = 0;
param.ioCRefNum = refNum;
param.csCode = kSERDInputCount;
res = PBStatusSync((ParmBlkPtr)&param);
*count = *(long*)&param.csParam;
return res;
}
ssize_t read(int fd, void *buf, size_t count)
{
int res;
ParamBlockRec param;
long available;
res = SerGetBuf(fd, &available);
if ( (res != noErr) || (available == 0) )
return 0;
param.ioCompletion = 0;
param.ioVRefNum = 0;
param.ioRefNum = fd;
param.ioBuffer = (u_int32_t)buf;
param.ioReqCount= count;
param.ioReqCount= count > available ? available : count;
param.ioPosMode = fsAtMark;
param.ioPosOffset = 0;
res = PBReadSync(&param);
if (res != noErr)
return 0;
return param.ioActCount;
}
#endif
@ -418,12 +440,12 @@ int serial_getchar(void)
return c;
}
return -1;
return 0;
}
int serial_keypressed()
{
if (serial_getchar() != -1)
if (serial_getchar() != 0)
return 1;
return 0;