cutils: add functions for IEC and SI prefixes

Extract the knowledge of IEC and SI prefixes out of size_to_str and
freq_to_str, so that it can be reused when printing statistics.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/tests/unit/test-cutils.c b/tests/unit/test-cutils.c
index 98671f1ac3..f5b780f012 100644
--- a/tests/unit/test-cutils.c
+++ b/tests/unit/test-cutils.c
@@ -2450,6 +2450,50 @@ static void test_qemu_strtosz_metric(void)
     g_assert(endptr == str + 7);
 }
 
+static void test_freq_to_str(void)
+{
+    g_assert_cmpstr(freq_to_str(999), ==, "999 Hz");
+    g_assert_cmpstr(freq_to_str(1000), ==, "1 KHz");
+    g_assert_cmpstr(freq_to_str(1010), ==, "1.01 KHz");
+}
+
+static void test_size_to_str(void)
+{
+    g_assert_cmpstr(size_to_str(0), ==, "0 B");
+    g_assert_cmpstr(size_to_str(1), ==, "1 B");
+    g_assert_cmpstr(size_to_str(1016), ==, "0.992 KiB");
+    g_assert_cmpstr(size_to_str(1024), ==, "1 KiB");
+    g_assert_cmpstr(size_to_str(512ull << 20), ==, "512 MiB");
+}
+
+static void test_iec_binary_prefix(void)
+{
+    g_assert_cmpstr(iec_binary_prefix(0), ==, "");
+    g_assert_cmpstr(iec_binary_prefix(10), ==, "Ki");
+    g_assert_cmpstr(iec_binary_prefix(20), ==, "Mi");
+    g_assert_cmpstr(iec_binary_prefix(30), ==, "Gi");
+    g_assert_cmpstr(iec_binary_prefix(40), ==, "Ti");
+    g_assert_cmpstr(iec_binary_prefix(50), ==, "Pi");
+    g_assert_cmpstr(iec_binary_prefix(60), ==, "Ei");
+}
+
+static void test_si_prefix(void)
+{
+    g_assert_cmpstr(si_prefix(-18), ==, "a");
+    g_assert_cmpstr(si_prefix(-15), ==, "f");
+    g_assert_cmpstr(si_prefix(-12), ==, "p");
+    g_assert_cmpstr(si_prefix(-9), ==, "n");
+    g_assert_cmpstr(si_prefix(-6), ==, "u");
+    g_assert_cmpstr(si_prefix(-3), ==, "m");
+    g_assert_cmpstr(si_prefix(0), ==, "");
+    g_assert_cmpstr(si_prefix(3), ==, "K");
+    g_assert_cmpstr(si_prefix(6), ==, "M");
+    g_assert_cmpstr(si_prefix(9), ==, "G");
+    g_assert_cmpstr(si_prefix(12), ==, "T");
+    g_assert_cmpstr(si_prefix(15), ==, "P");
+    g_assert_cmpstr(si_prefix(18), ==, "E");
+}
+
 int main(int argc, char **argv)
 {
     g_test_init(&argc, &argv, NULL);
@@ -2729,5 +2773,13 @@ int main(int argc, char **argv)
     g_test_add_func("/cutils/strtosz/metric",
                     test_qemu_strtosz_metric);
 
+    g_test_add_func("/cutils/size_to_str",
+                    test_size_to_str);
+    g_test_add_func("/cutils/freq_to_str",
+                    test_freq_to_str);
+    g_test_add_func("/cutils/iec_binary_prefix",
+                    test_iec_binary_prefix);
+    g_test_add_func("/cutils/si_prefix",
+                    test_si_prefix);
     return g_test_run();
 }