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sys: util: Add COND_CASE_1 macro
Add a switch/case like variant of the COND_CODE_1 macro where the first flag that equals 1 has its value expanded, with a default fallback. Signed-off-by: Pieter De Gendt <[email protected]>
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‎include/zephyr/sys/util_internal.h‎

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@@ -71,6 +71,66 @@
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/* Used to remove brackets from around a single argument. */
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#define __DEBRACKET(...) __VA_ARGS__
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/* Used by COND_CASE_1(); supports up to 16 flag/value pairs */
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#define Z_COND_CASE_1(...) \
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Z_COND_CASE_1_SELECT(NUM_VA_ARGS_LESS_1(__VA_ARGS__), __VA_ARGS__)
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#define Z_COND_CASE_1_SELECT(count_minus_one, ...) \
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UTIL_CAT(Z_COND_CASE_1_LEVEL_, count_minus_one)(__VA_ARGS__)
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#define Z_COND_CASE_1_LEVEL_0(_default) __DEBRACKET _default
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#define Z_COND_CASE_1_LEVEL_1(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_2(flag0, value0, _default) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (__DEBRACKET _default))
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#define Z_COND_CASE_1_LEVEL_3(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_4(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_2(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_5(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_6(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_4(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_7(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_8(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_6(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_9(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_10(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_8(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_11(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_12(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_10(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_13(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_14(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_12(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_15(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_16(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_14(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_17(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_18(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_16(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_19(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_20(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_18(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_21(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_22(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_20(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_23(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_24(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_22(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_25(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_26(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_24(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_27(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_28(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_26(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_29(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_30(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_28(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_31(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_LEVEL_32(flag0, value0, ...) \
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Z_COND_CODE_1(flag0, (__DEBRACKET value0), (Z_COND_CASE_1_LEVEL_30(__VA_ARGS__)))
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#define Z_COND_CASE_1_LEVEL_33(...) Z_COND_SWITCH_REQUIRES_FLAG_VALUE_PAIRS
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#define Z_COND_CASE_1_REQUIRES_FLAG_VALUE_PAIRS Z_COND_CASE_1_REQUIRES_FLAG_VALUE_PAIRS
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/* Used by IS_EMPTY() */
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/* reference: https://gustedt.wordpress.com/2010/06/08/detect-empty-macro-arguments/ */
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#define Z_HAS_COMMA(...) \

‎include/zephyr/sys/util_macro.h‎

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@@ -219,6 +219,31 @@ extern "C" {
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#define COND_CODE_0(_flag, _if_0_code, _else_code) \
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Z_COND_CODE_0(_flag, _if_0_code, _else_code)
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/**
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* @brief Evaluate a list of COND_CODE_1-style cases.
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*
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* Each case consists of a flag and a value wrapped in parentheses. The
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* arguments are processed from left to right until a flag expands to the
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* literal 1, in which case the corresponding value is expanded. If no flags
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* expand to 1, the last argument (which must also be wrapped in parentheses)
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* is used as the default value. Supplying only the default argument is also
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* supported.
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*
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* Example:
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*
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* int foo = COND_CASE_1(CONFIG_SOME_BOOL, (handle_a()),
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* CONFIG_SOME_OTHER_BOOL, (handle_b()),
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* (handle_default()));
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*
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* Supports up to 16 flag/value pairs before the default.
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*
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* @param ... Flag/value pairs followed by the default value. Each value must
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* be provided in parentheses to avoid comma handling issues.
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* @see COND_CODE_1()
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*/
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#define COND_CASE_1(...) \
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Z_COND_CASE_1(__VA_ARGS__)
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/**
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* @brief Insert code if @p _flag is defined and equals 1.
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*

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