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58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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freopen.cpp
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Changes the file with which a FILE is associated.
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*******************************************************************************/
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#include <errno.h>
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#include <stdio.h>
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#include "fdio.h"
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extern "C" FILE* freopen(const char* path, const char* mode, FILE* fp)
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{
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// If no path is given, simply try to change the mode of the file.
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if ( !path )
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{
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// TODO: Determine whether the file should be closed in case we fail
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// here to change the mode. A quick look at POSIX doesn't mention that
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// it should be closed, so we'll assume it shouldn't!
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if ( !fp->reopen_func )
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return errno = EBADF, (FILE*) NULL;
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if ( !fp->reopen_func(fp->user, mode) )
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return NULL;
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return fp;
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}
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// Uninstall the current backend of the FILE (after flushing) and return the
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// FILE to the default state (like a new object from fnewfile).
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fshutdown(fp);
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// Attempt to open the new path and install that into our FILE object.
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if ( fdio_install_path(fp, path, mode) != 0 )
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{
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fclose(fp);
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return NULL;
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}
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return fp;
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}
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