50 lines
1.8 KiB
C++
50 lines
1.8 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
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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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stdio/fresetfile.cpp
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After a FILE has been shut down, returns all fields to their default state.
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*******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// Note: This function preserves a few parts of the fields - this means that if
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// you are using this to reset a fresh FILE object, you should memset it
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// to zeroes first to avoid problems.
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extern "C" void fresetfile(FILE* fp)
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{
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FILE* prev = fp->prev;
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FILE* next = fp->next;
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unsigned char* keep_buffer = fp->buffer;
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void* free_user = fp->free_user;
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void (*free_func)(void*, FILE*) = fp->free_func;
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int kept_flags = fp->flags & (_FILE_REGISTERED | 0);
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memset(fp, 0, sizeof(*fp));
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fp->buffer = keep_buffer;
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fp->file_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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fp->flags = kept_flags;
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fp->buffer_mode = -1;
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fp->free_user = free_user;
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fp->free_func = free_func;
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fp->prev = prev;
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fp->next = next;
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}
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