util-mem.h

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Author : Pierre Le Marre
Date : 2023-11-21 08:46:06
Hash : dbc187cf
Message : utils: Steal `steal` from libei Add excerpt of `util-mem.h` from libei defining the macro `steal`, in order to improve memory management and the code semantics. See: https://gitlab.freedesktop.org/libinput/libei/-/blob/38132d6fc5905e2d4361325fdded29a0dff990d6/src/util-mem.h#L92

src/util-mem.h

/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2020 Red Hat, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#pragma once

#include "config.h"
#include <stdlib.h>

static inline void*
_steal(void *ptr) {
    void **original = (void**)ptr;
    void *swapped = *original;
    *original = NULL;
    return swapped;
}

/**
 * Resets the pointer content and resets the data to NULL.
 */
#ifdef _WIN32
#define steal(ptr_) \
    _steal(ptr_)
#else
#define steal(ptr_) \
    (__typeof__(*ptr_))_steal(ptr_)
#endif

kc3-lang/libxkbcommon/src/util-mem.h

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kc3-lang/libxkbcommon /src/util-mem.h