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macro: introduce FOREACH_ARRAY() macro

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The pattern that runs all array element is quite common.
But, sometimes, the number of element may be in a signed integer, or the
array may be NULL.
This commit is contained in:
Yu Watanabe
2023-03-05 14:56:15 +09:00
parent 9200e520ad
commit 5716c27e1f
2 changed files with 57 additions and 0 deletions
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7
src/basic/macro.h
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@@ -297,6 +297,13 @@ static inline int __coverity_check_and_return__(int condition) {
p != (typeof(p)) POINTER_MAX; \
p = *(++_l))
#define _FOREACH_ARRAY(i, array, num, m, s) \
for (typeof(num) m = (num); m > 0; m = 0) \
for (typeof(array[0]) *s = (array), *i = s; s && i < s + m; i++)
#define FOREACH_ARRAY(i, array, num) \
_FOREACH_ARRAY(i, array, num, UNIQ_T(m, UNIQ), UNIQ_T(s, UNIQ))
#define DEFINE_TRIVIAL_DESTRUCTOR(name, type, func) \
static inline void name(type *p) { \
func(p); \

50
src/test/test-macro.c
View File

@@ -584,4 +584,54 @@ TEST(ALIGNED) {
#endif
}
TEST(FOREACH_ARRAY) {
int a[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int b[10] = { 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 };
int x, n;
x = n = 0;
FOREACH_ARRAY(i, a, 10) {
x += *i;
n++;
}
assert_se(x == 45);
assert_se(n == 10);
x = n = 0;
FOREACH_ARRAY(i, a, 10)
FOREACH_ARRAY(j, b, 10) {
x += (*i) * (*j);
n++;
}
assert_se(x == 45 * 45);
assert_se(n == 10 * 10);
x = n = 0;
FOREACH_ARRAY(i, a, 5)
FOREACH_ARRAY(j, b, 5) {
x += (*i) * (*j);
n++;
}
assert_se(x == 10 * 35);
assert_se(n == 5 * 5);
x = n = 0;
FOREACH_ARRAY(i, a, 0)
FOREACH_ARRAY(j, b, 0) {
x += (*i) * (*j);
n++;
}
assert_se(x == 0);
assert_se(n == 0);
x = n = 0;
FOREACH_ARRAY(i, a, -1)
FOREACH_ARRAY(j, b, -1) {
x += (*i) * (*j);
n++;
}
assert_se(x == 0);
assert_se(n == 0);
}
DEFINE_TEST_MAIN(LOG_INFO);