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51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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* Copyright (c) 2011-2014, Wind River Systems, Inc.
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* Copyright (c) 2020, Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Misc utilities
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*
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* Repetitive or obscure helper macros needed by sys/util.h.
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*/
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#ifndef ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_
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#define ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_
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/* IS_ENABLED() helpers */
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/* This is called from IS_ENABLED(), and sticks on a "_XXXX" prefix,
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* it will now be "_XXXX1" if config_macro is "1", or just "_XXXX" if it's
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* undefined.
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* ENABLED: Z_IS_ENABLED2(_XXXX1)
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* DISABLED Z_IS_ENABLED2(_XXXX)
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*/
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#define Z_IS_ENABLED1(config_macro) Z_IS_ENABLED2(_XXXX##config_macro)
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/* Here's the core trick, we map "_XXXX1" to "_YYYY," (i.e. a string
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* with a trailing comma), so it has the effect of making this a
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* two-argument tuple to the preprocessor only in the case where the
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* value is defined to "1"
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* ENABLED: _YYYY, <--- note comma!
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* DISABLED: _XXXX
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*/
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#define _XXXX1 _YYYY,
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/* Then we append an extra argument to fool the gcc preprocessor into
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* accepting it as a varargs macro.
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* arg1 arg2 arg3
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* ENABLED: Z_IS_ENABLED3(_YYYY, 1, 0)
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* DISABLED Z_IS_ENABLED3(_XXXX 1, 0)
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*/
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#define Z_IS_ENABLED2(one_or_two_args) Z_IS_ENABLED3(one_or_two_args 1, 0)
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/* And our second argument is thus now cooked to be 1 in the case
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* where the value is defined to 1, and 0 if not:
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*/
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#define Z_IS_ENABLED3(ignore_this, val, ...) val
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#endif /* ZEPHYR_INCLUDE_SYS_UTIL_INTERNAL_H_ */
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