test-cutils: Cover qemu_strtosz() around range limits

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1487708048-2131-14-git-send-email-armbru@redhat.com>

1 files changed, 59 insertions, 2 deletions

diff --git a/tests/test-cutils.c b/tests/test-cutils.c
index 1773f15..df6c330 100644
--- a/tests/test-cutils.c
+++ b/tests/test-cutils.c
@@ -1371,16 +1371,52 @@ static void test_qemu_strtou64_full_max(void)
 
 static void test_qemu_strtosz_simple(void)
 {
-    const char *str = "12345M";
+    const char *str;
     char *endptr = NULL;
     int64_t res;
 
+    str = "0";
+    res = qemu_strtosz(str, &endptr);
+    g_assert_cmpint(res, ==, 0);
+    g_assert(endptr == str + 1);
+
+    str = "12345M";
     res = qemu_strtosz(str, &endptr);
     g_assert_cmpint(res, ==, 12345 * M_BYTE);
     g_assert(endptr == str + 6);
 
     res = qemu_strtosz(str, NULL);
     g_assert_cmpint(res, ==, 12345 * M_BYTE);
+
+    /* Note: precision is 53 bits since we're parsing with strtod() */
+
+    str = "9007199254740991"; /* 2^53-1 */
+    res = qemu_strtosz_suffix(str, &endptr, QEMU_STRTOSZ_DEFSUFFIX_B);
+    g_assert_cmpint(res, ==, 0x1fffffffffffff);
+    g_assert(endptr == str + 16);
+
+    str = "9007199254740992"; /* 2^53 */
+    res = qemu_strtosz_suffix(str, &endptr, QEMU_STRTOSZ_DEFSUFFIX_B);
+    g_assert_cmpint(res, ==, 0x20000000000000);
+    g_assert(endptr == str + 16);
+
+    str = "9007199254740993"; /* 2^53+1 */
+    res = qemu_strtosz_suffix(str, &endptr, QEMU_STRTOSZ_DEFSUFFIX_B);
+    g_assert_cmpint(res, ==, 0x20000000000000); /* rounded to 53 bits */
+    g_assert(endptr == str + 16);
+
+    str = "9223372036854774784"; /* 0x7ffffffffffffc00 (53 msbs set) */
+    res = qemu_strtosz_suffix(str, &endptr, QEMU_STRTOSZ_DEFSUFFIX_B);
+    g_assert_cmpint(res, ==, 0x7ffffffffffffc00);
+    g_assert(endptr == str + 19);
+
+    str = "9223372036854775295"; /* 0x7ffffffffffffdff */
+    res = qemu_strtosz_suffix(str, &endptr, QEMU_STRTOSZ_DEFSUFFIX_B);
+    g_assert_cmpint(res, ==, 0x7ffffffffffffc00); /* rounded to 53 bits */
+    g_assert(endptr == str + 19);
+
+    /* 0x7ffffffffffffe00..0x7fffffffffffffff get rounded to
+     * 0x8000000000000000, thus -ERANGE; see test_qemu_strtosz_erange() */
 }
 
 static void test_qemu_strtosz_units(void)
@@ -1482,10 +1518,31 @@ static void test_qemu_strtosz_trailing(void)
 
 static void test_qemu_strtosz_erange(void)
 {
-    const char *str = "10E";
+    const char *str;
     char *endptr = NULL;
     int64_t res;
 
+    str = "-1";
+    res = qemu_strtosz(str, &endptr);
+    g_assert_cmpint(res, ==, -ERANGE);
+    g_assert(endptr == str + 2);
+
+    str = "9223372036854775296"; /* 0x7ffffffffffffe00 */
+    res = qemu_strtosz_suffix(str, &endptr, QEMU_STRTOSZ_DEFSUFFIX_B);
+    g_assert_cmpint(res, ==, -ERANGE);
+    g_assert(endptr == str + 19);
+
+    str = "9223372036854775807"; /* 2^63-1 */
+    res = qemu_strtosz_suffix(str, &endptr, QEMU_STRTOSZ_DEFSUFFIX_B);
+    g_assert_cmpint(res, ==, -ERANGE);
+    g_assert(endptr == str + 19);
+
+    str = "9223372036854775808"; /* 2^63 */
+    res = qemu_strtosz_suffix(str, &endptr, QEMU_STRTOSZ_DEFSUFFIX_B);
+    g_assert_cmpint(res, ==, -ERANGE);
+    g_assert(endptr == str + 19);
+
+    str = "10E";
     res = qemu_strtosz(str, &endptr);
     g_assert_cmpint(res, ==, -ERANGE);
     g_assert(endptr == str + 3);