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// Copyright 2012 Intel Corporation
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// - Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// - Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <stddef.h>
#define container_of(ptr, type, member) ({ \
const __typeof__(((type *)0)->member ) *__mptr = (ptr); \
(type*)((void*)__mptr - offsetof(type, member)); \
})
/// @brief Safe downcast using container_of().
///
/// If given a null pointer, return null.
#define DEFINE_CONTAINER_CAST_FUNC(func_name, \
container_type, \
member_type, \
member) \
\
static inline container_type* \
func_name(member_type *member##_self) \
{ \
if (member##_self) \
return container_of(member##_self, container_type, member); \
else \
return 0; \
}
/// @brief Wrapper around malloc() that emits error if allocation fails.
void*
wcore_malloc(size_t size);
/// @brief Wrapper around calloc() that emits error if allocation fails.
///
/// This has the signature of malloc(), not calloc(), because calloc is too
/// easy to use incorrectly.
void*
wcore_calloc(size_t size);
/// @brief Create one of `union waffle_native_*`.
///
/// The example below allocates n_dpy and n_dpy->glx, then sets both
/// variables.
///
/// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~{.c}
/// union waffle_native_display *n_dpy;
/// WCORE_CREATE_NATIVE_UNION(n_dpy, glx);
/// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
///
#define WCORE_CREATE_NATIVE_UNION(union_var, union_member) \
do { \
union_var = wcore_malloc(sizeof(*union_var) + \
sizeof(*union_var->union_member)); \
if (union_var) \
union_var->union_member = (void*) (union_var + 1); \
} while (0)
const char*
wcore_enum_to_string(int32_t e);
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