[ruby/resolv] Fix warnings on cygwin

ruby/resolv@075e76f997

Author: nobu

ext/win32/resolv/resolv.c

@@ -21,7 +21,7 @@ w32error_make_error(DWORD e)
                        FORMAT_MESSAGE_IGNORE_INSERTS, &source, e,
                        MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
                        buffer, sizeof(buffer), NULL)) {
-        snprintf(buffer, sizeof(buffer), "Unknown Error %u", (unsigned long)e);
+        snprintf(buffer, sizeof(buffer), "Unknown Error %lu", (unsigned long)e);
     }
     p = buffer;
     while ((p = strpbrk(p, "\r\n")) != NULL) {
@@ -149,7 +149,6 @@ reg_each_key(VALUE self)
 {
     WCHAR wname[256];
     HKEY hkey = DATA_PTR(self);
-    rb_encoding *utf8 = rb_utf8_encoding();
     VALUE k = TypedData_Wrap_Struct(CLASS_OF(self), &hkey_type, NULL);
     DWORD i, e, n;
     for (i = 0; n = numberof(wname), (e = RegEnumKeyExW(hkey, i, wname, &n, NULL, NULL, NULL, NULL)) == ERROR_SUCCESS; i++) {
@@ -187,20 +186,20 @@ reg_value(VALUE self, VALUE name)
       case REG_DWORD: case REG_DWORD_BIG_ENDIAN:
         {
             DWORD d;
-            if (size != sizeof(d)) rb_raise(rb_eRuntimeError, "invalid size returned: %lu", size);
+            if (size != sizeof(d)) rb_raise(rb_eRuntimeError, "invalid size returned: %lu", (unsigned long)size);
             w32error_check(RegGetValueW(hkey, NULL, wname, RRF_RT_REG_DWORD, &type, &d, &size));
             if (type == REG_DWORD_BIG_ENDIAN) d = swap_dw(d);
             return ULONG2NUM(d);
         }
       case REG_QWORD:
         {
             QWORD q;
-            if (size != sizeof(q)) rb_raise(rb_eRuntimeError, "invalid size returned: %lu", size);
+            if (size != sizeof(q)) rb_raise(rb_eRuntimeError, "invalid size returned: %lu", (unsigned long)size);
             w32error_check(RegGetValueW(hkey, NULL, wname, RRF_RT_REG_QWORD, &type, &q, &size));
             return ULL2NUM(q);
         }
       case REG_SZ: case REG_MULTI_SZ: case REG_EXPAND_SZ:
-        if (size % sizeof(WCHAR)) rb_raise(rb_eRuntimeError, "invalid size returned: %lu", size);
+        if (size % sizeof(WCHAR)) rb_raise(rb_eRuntimeError, "invalid size returned: %lu", (unsigned long)size);
         buffer = ALLOCV_N(char, value_buffer, size);
         break;
       default:
@@ -211,7 +210,6 @@ reg_value(VALUE self, VALUE name)
     switch (type) {
       case REG_MULTI_SZ: {
         const WCHAR *w = (WCHAR *)buffer;
-        rb_encoding *utf8 = rb_utf8_encoding();
         result = rb_ary_new();
         size /= sizeof(WCHAR);
         size -= 1;