Fix format specifiers in test cases on Win32

Some of the test suites use fprintf with format specifiers
that are not supported on Win32 and are not fixed by gnulib.

The mingw32 compiler also has trouble detecting ssize_t
correctly, complaining that 'ssize_t' does not match
'signed size_t' (which it expects for %zd). Force the
cast to size_t to avoid this problem

* tests/testutils.c, tests/testutils.h: Fix printf
  annotation on virTestResult. Use virVasprintf
  instead of vfprintf
* tests/virhashtest.c: Use VIR_WARN instead of fprintf(stderr).
  Cast to size_t to avoid mingw32 compiler bug
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

tests/testutils.c

@@ -72,7 +72,7 @@ virtTestCountAverage(double *items, int nitems)
     return (double) (sum / nitems);
 }
 
-ATTRIBUTE_FMT_PRINTF(3,4)
+
 void virtTestResult(const char *name, int ret, const char *msg, ...)
 {
     va_list vargs;
@@ -89,7 +89,11 @@ void virtTestResult(const char *name, int ret, const char *msg, ...)
         else {
             fprintf(stderr, "FAILED\n");
             if (msg) {
-                vfprintf(stderr, msg, vargs);
+                char *str;
+                if (virVasprintf(&str, msg, vargs) == 0) {
+                    fprintf(stderr, "%s", str);
+                    VIR_FREE(str);
+                }
             }
         }
     } else {

tests/testutils.h

@@ -23,7 +23,8 @@ extern char *abs_srcdir;
 double virtTestCountAverage(double *items,
                             int nitems);
 
-void virtTestResult(const char *name, int ret, const char *msg, ...);
+void virtTestResult(const char *name, int ret, const char *msg, ...)
+    ATTRIBUTE_FMT_PRINTF(3,4);
 int virtTestRun(const char *title,
                 int nloops,
                 int (*body)(const void *data),

tests/virhashtest.c

@@ -10,11 +10,17 @@
 #include "virhashdata.h"
 #include "testutils.h"
 #include "memory.h"
+#include "util.h"
+#include "logging.h"
 
 
 #define testError(...)                                          \
     do {                                                        \
-        fprintf(stderr, __VA_ARGS__);                           \
+        char *str;                                              \
+        if (virAsprintf(&str, __VA_ARGS__) == 0) {              \
+            fprintf(stderr, "%s", str);                         \
+            VIR_FREE(str);                                      \
+        }                                                       \
         /* Pad to line up with test name ... in virTestRun */   \
         fprintf(stderr, "%74s", "... ");                        \
     } while (0)
@@ -40,16 +46,16 @@ testHashInit(int size)
         }
 
         if (virHashTableSize(hash) != oldsize && virTestGetDebug()) {
-            fprintf(stderr, "\nhash grown from %zd to %zd",
-                    oldsize, virHashTableSize(hash));
+            VIR_WARN("hash grown from %zd to %zd",
+                     (size_t)oldsize, (size_t)virHashTableSize(hash));
         }
     }
 
     for (i = 0; i < ARRAY_CARDINALITY(uuids); i++) {
         if (!virHashLookup(hash, uuids[i])) {
             if (virTestGetVerbose()) {
-                fprintf(stderr, "\nentry \"%s\" could not be found\n",
-                        uuids[i]);
+                VIR_WARN("\nentry \"%s\" could not be found\n",
+                         uuids[i]);
             }
             virHashFree(hash);
             return NULL;
@@ -75,15 +81,15 @@ testHashCheckCount(virHashTablePtr hash, size_t count)
     ssize_t iter_count = 0;
 
     if (virHashSize(hash) != count) {
-        testError("\nhash contains %zd instead of %zu elements\n",
-                  virHashSize(hash), count);
+        testError("\nhash contains %zu instead of %zu elements\n",
+                  (size_t)virHashSize(hash), count);
         return -1;
     }
 
     iter_count = virHashForEach(hash, testHashCheckForEachCount, NULL);
     if (count != iter_count) {
-        testError("\nhash claims to have %zu elements but iteration finds %zd\n",
-                  count, iter_count);
+        testError("\nhash claims to have %zu elements but iteration finds %zu\n",
+                  count, (size_t)iter_count);
         return -1;
     }