fix mbrtowc test failures on MSVC

[Bruno Haible]

On MSVC 14, the tests test-mbrtowc-w32-3.sh, test-mbrtowc-w32-4.sh,
test-mbrtowc-w32-5.sh fail, because the charset converter behaves a bit
differently than the GNU one.


2017-04-21  Bruno Haible  <br...@clisp.org>

        mbrtowc tests: Fix test failures on MSVC 14.
        * tests/test-mbrtowc-w32.c (test_one_locale): Accept MSVC's conversion
        behaviour for invalid input.

diff --git a/tests/test-mbrtowc-w32.c b/tests/test-mbrtowc-w32.c
index 4dc30b0..70afc87 100644
--- a/tests/test-mbrtowc-w32.c
+++ b/tests/test-mbrtowc-w32.c
@@ -325,14 +325,12 @@ test_one_locale (const char *name, int codepage)
         memset (&state, '\0', sizeof (mbstate_t));
         wc = (wchar_t) 0xBADFACE;
         ret = mbrtowc (&wc, "\377", 1, &state); /* 0xFF */
-        ASSERT (ret == (size_t)-1);
-        ASSERT (errno == EILSEQ);
+        ASSERT ((ret == (size_t)-1 && errno == EILSEQ) || ret == (size_t)-2);
 
         memset (&state, '\0', sizeof (mbstate_t));
         wc = (wchar_t) 0xBADFACE;
         ret = mbrtowc (&wc, "\225\377", 2, &state); /* 0x95 0xFF */
-        ASSERT (ret == (size_t)-1);
-        ASSERT (errno == EILSEQ);
+        ASSERT ((ret == (size_t)-1 && errno == EILSEQ) || (ret == 2 && wc == 
0x30FB));
       }
       return 0;
 
@@ -397,14 +395,12 @@ test_one_locale (const char *name, int codepage)
         memset (&state, '\0', sizeof (mbstate_t));
         wc = (wchar_t) 0xBADFACE;
         ret = mbrtowc (&wc, "\377", 1, &state); /* 0xFF */
-        ASSERT (ret == (size_t)-1);
-        ASSERT (errno == EILSEQ);
+        ASSERT ((ret == (size_t)-1 && errno == EILSEQ) || ret == (size_t)-2);
 
         memset (&state, '\0', sizeof (mbstate_t));
         wc = (wchar_t) 0xBADFACE;
         ret = mbrtowc (&wc, "\225\377", 2, &state); /* 0x95 0xFF */
-        ASSERT (ret == (size_t)-1);
-        ASSERT (errno == EILSEQ);
+        ASSERT ((ret == (size_t)-1 && errno == EILSEQ) || (ret == 2 && wc == 
'?'));
       }
       return 0;
 
@@ -469,14 +465,12 @@ test_one_locale (const char *name, int codepage)
         memset (&state, '\0', sizeof (mbstate_t));
         wc = (wchar_t) 0xBADFACE;
         ret = mbrtowc (&wc, "\377", 1, &state); /* 0xFF */
-        ASSERT (ret == (size_t)-1);
-        ASSERT (errno == EILSEQ);
+        ASSERT ((ret == (size_t)-1 && errno == EILSEQ) || ret == (size_t)-2);
 
         memset (&state, '\0', sizeof (mbstate_t));
         wc = (wchar_t) 0xBADFACE;
         ret = mbrtowc (&wc, "\225\377", 2, &state); /* 0x95 0xFF */
-        ASSERT (ret == (size_t)-1);
-        ASSERT (errno == EILSEQ);
+        ASSERT ((ret == (size_t)-1 && errno == EILSEQ) || (ret == 2 && wc == 
'?'));
       }
       return 0;