45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* stdio/fresetfile.c
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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 <pthread.h>
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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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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_mutex_t) 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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