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macro: use unique variable names for math-macros

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Similar to container_of(), we now use unique variable names for the bascic
math macros MAX, MIN, CLAMP, LESS_BY. Furthermore, unit tests are added to
verify they work as expected.

For a rationale, see:
    commit fb835651af
    Author: David Herrmann <dh.herrmann@gmail.com>
    Date:   Fri Aug 22 14:41:37 2014 +0200

        shared: make container_of() use unique variable names
This commit is contained in:
David Herrmann
2014-08-28 14:45:38 +02:00
parent d974ad0524
commit 667a0377fb
2 changed files with 47 additions and 23 deletions
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src/test/test-util.c
+17
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@@ -94,6 +94,23 @@ static void test_max(void) {
assert_cc(MAXSIZE(char[3], uint16_t) == 3);
assert_cc(MAXSIZE(char[3], uint32_t) == 4);
assert_cc(MAXSIZE(char, long) == sizeof(long));
assert_se(MAX(-5, 5) == 5);
assert_se(MAX(5, 5) == 5);
assert_se(MAX(MAX(1, MAX(2, MAX(3, 4))), 5) == 5);
assert_se(MAX(MAX(1, MAX(2, MAX(3, 2))), 1) == 3);
assert_se(MAX(MIN(1, MIN(2, MIN(3, 4))), 5) == 5);
assert_se(MAX(MAX(1, MIN(2, MIN(3, 2))), 1) == 2);
assert_se(LESS_BY(8, 4) == 4);
assert_se(LESS_BY(8, 8) == 0);
assert_se(LESS_BY(4, 8) == 0);
assert_se(LESS_BY(16, LESS_BY(8, 4)) == 12);
assert_se(LESS_BY(4, LESS_BY(8, 4)) == 0);
assert_se(CLAMP(-5, 0, 1) == 0);
assert_se(CLAMP(5, 0, 1) == 1);
assert_se(CLAMP(5, -10, 1) == 1);
assert_se(CLAMP(5, -10, 10) == 5);
assert_se(CLAMP(CLAMP(0, -10, 10), CLAMP(-5, 10, 20), CLAMP(100, -5, 20)) == 10);
}
static void test_container_of(void) {