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111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/*
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* $Id: stdio_get_file_descriptor.c,v 1.5 2006-01-08 12:04:24 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDIO_HEADERS_H
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#include "stdio_headers.h"
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#endif /* _STDIO_HEADERS_H */
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/****************************************************************************/
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enum resolution_mode_t
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{
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resolution_mode_exact, /* Return the descriptor exactly as it is. */
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resolution_mode_alias /* Resolve the descriptor's alias, if necessary. */
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};
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/****************************************************************************/
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STATIC struct fd *
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get_file_descriptor(int file_descriptor,enum resolution_mode_t resolution_mode)
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{
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struct fd * result = NULL;
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struct fd * fd;
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__stdio_lock();
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if(file_descriptor < 0 || file_descriptor >= __num_fd)
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{
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SHOWMSG("invalid file descriptor");
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goto out;
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}
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fd = __fd[file_descriptor];
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if(fd == NULL)
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{
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SHOWMSG("invalid file descriptor");
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goto out;
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}
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if(FLAG_IS_CLEAR(fd->fd_Flags,FDF_IN_USE))
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{
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SHOWMSG("this descriptor is not even in use");
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goto out;
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}
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/* Move up to the original file, if this is an alias. */
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if(resolution_mode == resolution_mode_alias && fd->fd_Original != NULL)
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fd = fd->fd_Original;
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result = fd;
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out:
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__stdio_unlock();
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return(result);
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}
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/****************************************************************************/
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struct fd *
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__get_file_descriptor(int file_descriptor)
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{
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struct fd * result;
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result = get_file_descriptor(file_descriptor,resolution_mode_alias);
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return(result);
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}
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/****************************************************************************/
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struct fd *
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__get_file_descriptor_dont_resolve(int file_descriptor)
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{
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struct fd * result;
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result = get_file_descriptor(file_descriptor,resolution_mode_exact);
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return(result);
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}
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