[klibc] Fix tiny vsnprintf long long formatting

Author: CYFS3

src/klibc/rt_vsnprintf_tiny.c

@@ -109,7 +109,15 @@ static char *print_number(char *buf,
                 num = (rt_uint16_t)-num;
             }
             break;
+#ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
         case 'L':
+            if (num > (~0ULL >> 1))
+            {
+                sign = '-';
+                num = 0ULL - num;
+            }
+            break;
+#endif /* RT_KLIBC_USING_VSNPRINTF_LONGLONG */
         case 'l':
             if ((long)num < 0)
             {
@@ -595,7 +603,14 @@ int rt_vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 
         if (qualifier == 'L')
         {
-            num = va_arg(args, unsigned long long);
+            if (flags & SIGN)
+            {
+                num = (unsigned long long)va_arg(args, long long);
+            }
+            else
+            {
+                num = va_arg(args, unsigned long long);
+            }
         }
         else if (qualifier == 'l')
         {

src/klibc/utest/TC_rt_sprintf.c

@@ -913,10 +913,12 @@ SPRINTF_TEST_CASE(integer_types)
     SPRINTF_CHECK("2147483647", buffer, "%li", 2147483647L);
 #ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
     SPRINTF_CHECK("30", buffer, "%lli", 30LL);
-#ifdef RT_KLIBC_USING_VSNPRINTF_STANDARD
     SPRINTF_CHECK("-9223372036854775807", buffer, "%lli", -9223372036854775807LL);
     SPRINTF_CHECK("9223372036854775807", buffer, "%lli", 9223372036854775807LL);
-#endif /* RT_KLIBC_USING_VSNPRINTF_STANDARD */
+    SPRINTF_CHECK("-2147483648", buffer, "%lld", (long long)(rt_int64_t)-2147483648LL);
+    SPRINTF_CHECK("4294967295", buffer, "%lld", (long long)(rt_int64_t)RT_UINT32_MAX);
+    SPRINTF_CHECK("-9223372036854775808", buffer, "%lld", (long long)(-9223372036854775807LL - 1LL));
+    SPRINTF_CHECK("9223372036854775807", buffer, "%lld", 9223372036854775807LL);
 #endif /* RT_KLIBC_USING_VSNPRINTF_LONGLONG */
     SPRINTF_CHECK("100000", buffer, "%lu", 100000L);
     SPRINTF_CHECK("4294967295", buffer, "%lu", 0xFFFFFFFFL);