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macro: add a macro to test whether a value is in a specified list
Introduce IN_SET() macro to nicely check whether a value a is one of a few listed values. This makes writing this: if (a == 1 || a == 7 || a == 8 || a == 9) nicer, by allowing this: if (IN_SET(a, 1, 7, 8, 9)) This is particularly useful for state machine enums.
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@ -285,4 +285,17 @@ do { \
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#define SET_FLAG(v, flag, b) \
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(v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
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#define IN_SET(x, ...) ({ \
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typeof(x) _x = (x); \
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unsigned _i; \
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bool _found = false; \
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for (_i = 0; _i < sizeof((typeof(_x)[]) { __VA_ARGS__ })/sizeof(typeof(_x)); _i++) \
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if (((typeof(_x)[]) { __VA_ARGS__ })[_i] == _x) { \
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_found = true; \
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break; \
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} \
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_found; \
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})
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#include "log.h"
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@ -568,6 +568,16 @@ static void test_get_files_in_directory(void) {
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assert_se(get_files_in_directory(".", NULL) >= 0);
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}
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static void test_in_set(void) {
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assert_se(IN_SET(1, 1));
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assert_se(IN_SET(1, 1, 2, 3, 4));
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assert_se(IN_SET(2, 1, 2, 3, 4));
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assert_se(IN_SET(3, 1, 2, 3, 4));
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assert_se(IN_SET(4, 1, 2, 3, 4));
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assert_se(!IN_SET(0, 1));
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assert_se(!IN_SET(0, 1, 2, 3, 4));
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}
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int main(int argc, char *argv[]) {
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test_streq_ptr();
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test_first_word();
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@ -604,6 +614,7 @@ int main(int argc, char *argv[]) {
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test_split_pair();
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test_fstab_node_to_udev_node();
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test_get_files_in_directory();
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test_in_set();
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return 0;
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}
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