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Merge pull request #17142 from benpicco/index_of

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core/include/kernel_defines.h: add index_of() macro
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benpicco 2021-11-05 23:19:37 +01:00 committed by GitHub
commit 321918ce02
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2 changed files with 20 additions and 0 deletions
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10
core/include/kernel_defines.h
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@ -63,6 +63,16 @@ extern "C" {
((TYPE *) ((char *) (PTR) - offsetof(TYPE, MEMBER)))
#endif
/**
* @def index_of(ARRAY, ELEMENT)
* @brief Returns the index of a pointer to an array element.
* @param[in] ARRAY an array
* @param[in] ELEMENT pointer to an array element
* @return Index of the element in the array
*/
#define index_of(ARRAY, ELEMENT) (((uintptr_t)(ELEMENT) - (uintptr_t)(ARRAY)) / sizeof(*(ELEMENT)))
/**
* @def NORETURN
* @brief The *NORETURN* keyword tells the compiler to assume that the function

10
tests/unittests/tests-kernel_defines/tests-kernel_defines.c
View File

@ -46,10 +46,20 @@ static void test_kernel_version(void)
#endif
}
static void test_index_of(void)
{
unsigned foo[8];
uint8_t bar[32];
TEST_ASSERT_EQUAL_INT(5, index_of(foo, &foo[5]));
TEST_ASSERT_EQUAL_INT(17, index_of(bar, &bar[17]));
}
Test *tests_kernel_defines_tests(void)
{
EMB_UNIT_TESTFIXTURES(fixtures) {
new_TestFixture(test_kernel_version),
new_TestFixture(test_index_of),
};
EMB_UNIT_TESTCALLER(kernel_defines_tests, NULL, NULL, fixtures);