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time-util: rename usec_sub() to usec_sub_signed() and add usec_sub_unsigned()

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Quite often we just want to subtract two normal usec_t values, hence
provide an implementation for that.
This commit is contained in:
Lennart Poettering
2017-06-22 20:51:06 +02:00
parent 8825742c44
commit 54d8ef14d8
4 changed files with 49 additions and 23 deletions
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src/test/test-time.c
+33 -11
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@@ -195,16 +195,37 @@ static void test_usec_add(void) {
assert_se(usec_add(USEC_INFINITY, 2) == USEC_INFINITY);
}
static void test_usec_sub(void) {
assert_se(usec_sub(0, 0) == 0);
assert_se(usec_sub(4, 1) == 3);
assert_se(usec_sub(4, 4) == 0);
assert_se(usec_sub(4, 5) == 0);
assert_se(usec_sub(USEC_INFINITY-3, -3) == USEC_INFINITY);
assert_se(usec_sub(USEC_INFINITY-3, -3) == USEC_INFINITY);
assert_se(usec_sub(USEC_INFINITY-3, -4) == USEC_INFINITY);
assert_se(usec_sub(USEC_INFINITY-3, -5) == USEC_INFINITY);
assert_se(usec_sub(USEC_INFINITY, 5) == USEC_INFINITY);
static void test_usec_sub_unsigned(void) {
assert_se(usec_sub_unsigned(0, 0) == 0);
assert_se(usec_sub_unsigned(0, 2) == 0);
assert_se(usec_sub_unsigned(0, USEC_INFINITY) == 0);
assert_se(usec_sub_unsigned(1, 0) == 1);
assert_se(usec_sub_unsigned(1, 1) == 0);
assert_se(usec_sub_unsigned(1, 2) == 0);
assert_se(usec_sub_unsigned(1, 3) == 0);
assert_se(usec_sub_unsigned(1, USEC_INFINITY) == 0);
assert_se(usec_sub_unsigned(USEC_INFINITY-1, 0) == USEC_INFINITY-1);
assert_se(usec_sub_unsigned(USEC_INFINITY-1, 1) == USEC_INFINITY-2);
assert_se(usec_sub_unsigned(USEC_INFINITY-1, 2) == USEC_INFINITY-3);
assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY-2) == 1);
assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY-1) == 0);
assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY) == 0);
assert_se(usec_sub_unsigned(USEC_INFINITY, 0) == USEC_INFINITY);
assert_se(usec_sub_unsigned(USEC_INFINITY, 1) == USEC_INFINITY);
assert_se(usec_sub_unsigned(USEC_INFINITY, 2) == USEC_INFINITY);
assert_se(usec_sub_unsigned(USEC_INFINITY, USEC_INFINITY) == USEC_INFINITY);
}
static void test_usec_sub_signed(void) {
assert_se(usec_sub_signed(0, 0) == 0);
assert_se(usec_sub_signed(4, 1) == 3);
assert_se(usec_sub_signed(4, 4) == 0);
assert_se(usec_sub_signed(4, 5) == 0);
assert_se(usec_sub_signed(USEC_INFINITY-3, -3) == USEC_INFINITY);
assert_se(usec_sub_signed(USEC_INFINITY-3, -3) == USEC_INFINITY);
assert_se(usec_sub_signed(USEC_INFINITY-3, -4) == USEC_INFINITY);
assert_se(usec_sub_signed(USEC_INFINITY-3, -5) == USEC_INFINITY);
assert_se(usec_sub_signed(USEC_INFINITY, 5) == USEC_INFINITY);
}
static void test_format_timestamp(void) {
@@ -322,7 +343,8 @@ int main(int argc, char *argv[]) {
test_timezone_is_valid();
test_get_timezones();
test_usec_add();
test_usec_sub();
test_usec_sub_signed();
test_usec_sub_unsigned();
test_format_timestamp();
test_format_timestamp_utc();
test_dual_timestamp_deserialize();