_CODE_ACCESS int fgetc(register FILE *_fp)
{
int retval = EOF;
/*------------------------------------------------------------------------*/
/* The current thread in a multi-threaded application must protect access */
/* to __TI_LOCK_FILE_TBL shared resources (_ftable[], _ft_end, and */
/* _tmpnams[]). In this case, _ftable[] may be updated, so we must ensure */
/* that the local copy of _ftable[] is flushed to shared memory before */
/* leaving the critical section (invalidated if it is not modified). */
/*------------------------------------------------------------------------*/
__TI_resource_lock(__TI_LOCK_FILE_TBL);
/*------------------------------------------------------------------------*/
/* Make sure that it is OK to read from this stream. */
/*------------------------------------------------------------------------*/
if (!_rd_ok(_fp)) goto fgetc_exit;
/*------------------------------------------------------------------------*/
/* For non-buffered streams, call the lowlevel READ function. */
/*------------------------------------------------------------------------*/
if (_BUFFMODE(_fp) == _IONBF)
{
int errchk;
char result;
if (_STCHK(_fp, _UNGETC))
{
_UNSET(_fp, _UNGETC);
retval = (int)*(_fp->pos++);
goto fgetc_exit;
}
errchk = read(_fp->fd, &result, 1);
if (errchk <= 0)
{
_SET(_fp, (errchk == 0) ? _STATEOF : _STATERR);
goto fgetc_exit;
}
retval = (int)result;
goto fgetc_exit;
}
/*------------------------------------------------------------------------*/
/* If the buffer has been entirely read, or is empty, call _BUFF_READ to */
/* fill the buffer. */
/*------------------------------------------------------------------------*/
if (_fp->pos == _fp->buff_stop) _buff_read(_fp);
/*------------------------------------------------------------------------*/
/* If the buffer read was unsuccessful, return an EOF. Otherwise, clear */
/* the _UNGETC flag in the stream, and return the next character. */
/*------------------------------------------------------------------------*/
if (_STCHK(_fp, (_STATERR | _STATEOF))) goto fgetc_exit;
_UNSET(_fp, _UNGETC);
retval = *(_fp->pos++);
fgetc_exit:
__TI_data_synch_WBINV(&_ftable, sizeof(_ftable));
__TI_resource_unlock(__TI_LOCK_FILE_TBL);
return (retval);
}
_CODE_ACCESS size_t fread(void *_ptr, size_t _size, size_t _count, FILE *_fp)
{
/*------------------------------------------------------------------------*/
/* Local variables */
/*------------------------------------------------------------------------*/
unsigned char *fpos = (unsigned char *)_ptr;
size_t num_left = _size * _count,
num_read = 0,
num_to_read = 0;
/*------------------------------------------------------------------------*/
/* The current thread in a multi-threaded application must protect access */
/* to __TI_LOCK_FILE_TBL shared resources (_ftable[], _ft_end, and */
/* _tmpnams[]). In this case, _ftable[] may be updated, so we must ensure */
/* that the local copy of _ftable[] is flushed to shared memory before */
/* leaving the critical section (invalidated if it is not modified). */
/*------------------------------------------------------------------------*/
__TI_resource_lock(__TI_LOCK_FILE_TBL);
/*------------------------------------------------------------------------*/
/* Make sure that the file is readable. */
/*------------------------------------------------------------------------*/
if (!_rd_ok(_fp) || _size == 0 || _count == 0)
{
__TI_data_synch_INV(&_ftable, sizeof(_ftable));
__TI_resource_unlock(__TI_LOCK_FILE_TBL);
return (0);
}
/*------------------------------------------------------------------------*/
/* If the stream is non-buffered, call the lowlevel READ function. */
/*------------------------------------------------------------------------*/
if (_BUFFMODE(_fp) == _IONBF)
{
int num_read = 0;
while (num_left > 0)
{
int read_return;
if (_STCHK(_fp, _UNGETC))
{
*fpos = *(_fp->pos++);
_UNSET(_fp, _UNGETC);
read_return = 1;
}
else
read_return = (size_t)(read(_fp->fd,
(char *)fpos + num_read, num_left));
if (read_return < 0)
{
_SET(_fp, _STATERR);
break;
}
else if (read_return == 0)
{
_SET(_fp, _STATEOF);
break;
}
else
{
num_read += read_return;
num_left -= read_return;
}
}
__TI_data_synch_WBINV(&_ftable, sizeof(_ftable));
__TI_resource_unlock(__TI_LOCK_FILE_TBL);
return (num_read / _size);
}
while (num_left > 0)
{
/*---------------------------------------------------------------------*/
/* If the buffer has been completely read, fill it up. Exit the loop */
/* if an I/O error occurs, or the end of the file is reached. */
/*---------------------------------------------------------------------*/
if(_fp->pos == _fp->buff_stop) _buff_read(_fp);
if(_STCHK(_fp, (_STATERR | _STATEOF))) break;
/*---------------------------------------------------------------------*/
/* Determine how many characters can fit in the buffer, and read them */
/* in. */
/*---------------------------------------------------------------------*/
num_to_read = (num_left < (_fp->buff_stop - _fp->pos)) ?
num_left : (_fp->buff_stop - _fp->pos);
memcpy(fpos, _fp->pos, num_to_read);
/*---------------------------------------------------------------------*/
/* Update pointers and counters. */
/*---------------------------------------------------------------------*/
fpos += num_to_read;
_fp->pos += num_to_read;
num_read += num_to_read;
num_left -= num_to_read;
}
/*------------------------------------------------------------------------*/
/* Clear the _UNGETC flag in the stream, and return the number of blocks */
/* read. */
/*------------------------------------------------------------------------*/
_UNSET(_fp, _UNGETC);
__TI_data_synch_WBINV(&_ftable, sizeof(_ftable));
__TI_resource_unlock(__TI_LOCK_FILE_TBL);
return (num_read / _size);
}
