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49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: LGPL-2.1-or-later
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/**
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* @file
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*
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* Cleanup functions.
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*/
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#ifndef DRGN_CLEANUP_H
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#define DRGN_CLEANUP_H
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#include <stdio.h>
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#include <stdlib.h>
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#define _cleanup_(x) __attribute__((__cleanup__(x)))
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/** Call @c free() when the variable goes out of scope. */
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#define _cleanup_free_ _cleanup_(freep)
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static inline void freep(void *p)
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{
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free(*(void **)p);
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}
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/** Call @c fclose() when the variable goes out of scope. */
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#define _cleanup_fclose_ _cleanup_(fclosep)
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static inline void fclosep(FILE **fp)
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{
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if (*fp)
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fclose(*fp);
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}
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/**
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* Get the value of a pointer variable and reset it to @c NULL.
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*
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* This can be used to avoid freeing a variable declared with @ref
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* _cleanup_free_ or another scope guard that is a no-op for @c NULL.
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*/
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#define no_cleanup_ptr(p) ({ __auto_type __ptr = (p); (p) = NULL; __ptr; })
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/**
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* Return a pointer declared with @ref _cleanup_free_ without freeing it.
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*
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* This can also be used for other scope guards that are a no-op for @c NULL.
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*/
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#define return_ptr(p) return no_cleanup_ptr(p)
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#endif /* DRGN_CLEANUP_H */
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