void __purgefp( void )
{
__stream_link *next;
_AccessIOB();
while( _RWD_cstream != NULL ) {
next = _RWD_cstream->next;
lib_free( _RWD_cstream );
_RWD_cstream = next;
}
_ReleaseIOB();
}
_WCRTLINK int fclose( FILE *fp )
{
__stream_link *link;
_AccessIOB();
for( link = _RWD_ostream; link != NULL; link = link->next ) {
if( link->stream == fp ) {
_ReleaseIOB();
return( __shutdown_stream( fp, 1 ) );
}
}
_ReleaseIOB();
return( -1 ); /* file not open */
}
FILE *__allocfp( void )
{
FILE *end;
FILE *fp;
__stream_link *link;
unsigned flags;
_AccessIOB();
/* Try and take one off the recently closed list */
link = _RWD_cstream;
if( link != NULL ) {
_RWD_cstream = link->next;
fp = link->stream;
flags = fp->_flag;
goto got_one;
}
/* See if there is a static FILE structure available. */
end = &_RWD_iob[_NFILES];
for( fp = _RWD_iob; fp < end; ++fp ) {
if( (fp->_flag & (_READ | _WRITE)) == 0 ) {
link = lib_malloc( sizeof( __stream_link ) );
if( link == NULL )
goto no_mem;
flags = 0;
goto got_one;
}
}
/* Allocate a new dynamic structure */
link = lib_malloc( sizeof( __stream_link ) + sizeof( FILE ) );
if( link == NULL )
goto no_mem;
fp = (FILE *)(link + 1);
flags = _DYNAMIC;
got_one:
memset( fp, 0, sizeof( *fp ) );
fp->_flag = flags;
link->stream = fp;
link->stream->_link = link; /* point back to link structure */
link->next = _RWD_ostream;
_RWD_ostream = link;
_ReleaseIOB();
return( fp );
no_mem:
_RWD_errno = ENOMEM;
_ReleaseIOB();
return( NULL ); /* no free slots */
}
static FILE *close_file( FILE *fp )
{
__stream_link * link;
__stream_link **owner;
_AccessIOB();
/* See if the file pointer is a currently open file. */
link = _RWD_ostream;
for( ;; ) {
if( link == NULL ) break;
if( link->stream == fp ) {
if( fp->_flag & (_READ|_WRITE) ) {
__doclose( fp, 1 );
}
_ReleaseIOB();
return( fp );
}
link = link->next;
}
/*
It's not on the list of open files, so check the list of
recently closed ones.
*/
owner = &_RWD_cstream;
for( ;; ) {
link = *owner;
if( link == NULL ) break;
if( link->stream == fp ) {
/* remove from closed list and put on open */
*owner = link->next;
link->next = _RWD_ostream;
_RWD_ostream = link;
_ReleaseIOB();
return( fp );
}
owner = &link->next;
}
/* We ain't seen that file pointer ever. Leave things be. */
__set_errno( EBADF );
_ReleaseIOB();
return( NULL );
}
int __flushall( int mask )
{
__stream_link *link;
FILE *fp;
int number_of_open_files;
_AccessIOB();
number_of_open_files = 0;
for( link = _RWD_ostream; link != NULL; link = link->next ) {
fp = link->stream;
if( fp->_flag & mask ) { /* if file is a candidate */
++number_of_open_files;
if( fp->_flag & _DIRTY ) {
__flush( fp );
}
}
}
_ReleaseIOB();
return( number_of_open_files );
}
void __freefp( FILE * fp )
{
__stream_link **owner;
__stream_link *link;
_AccessIOB();
owner = &_RWD_ostream;
for( ;; ) {
link = *owner;
if( link == NULL )
return;
if( link->stream == fp )
break;
owner = &link->next;
}
fp->_flag |= _READ | _WRITE;
(*owner) = link->next;
link->next = _RWD_cstream;
_RWD_cstream = link;
_ReleaseIOB();
}
