tests: skip test with broken fmemopen under sanitizers

fmemopen(2) is broken with address and memory sanitizer, see
google/sanitizers#627 and
google/sanitizers#628.

Author: cgzones

tests/empty_string.c

@@ -25,19 +25,30 @@ int main(void)
 	fail_unless(strcmp(cfg_getstr(cfg, "string"), "") == 0);
 	f = fmemopen(buf, sizeof(buf), "w+");
 	fail_unless(f != NULL);
-	cfg_print(cfg, f);
+	fail_unless(cfg_print(cfg, f) == CFG_SUCCESS);
 	cfg_free(cfg);
 
+#if defined(__has_feature)
+# if __has_feature(address_sanitizer) || __has_feature(memory_sanitizer)
+	/* Skip check since fmemopen(2) is broken with sanitizers, see
+	 *   https://github.com/google/sanitizers/issues/627
+	 *   https://github.com/google/sanitizers/issues/628
+	 */
+# else
 	/*
 	 * try to reload the generated temporary config file to check
 	 * that the default is indeed overridden by an empty string
 	 */
 	cfg = cfg_init(opts, 0);
-	fseek(f, 0L, SEEK_SET);
+	fail_unless(cfg != NULL);
+	fail_unless(fseek(f, 0L, SEEK_SET) == 0);
 	fail_unless(cfg_parse_fp(cfg, f) == CFG_SUCCESS);
-	fclose(f);
 	fail_unless(strcmp(cfg_getstr(cfg, "string"), "") == 0);
 	cfg_free(cfg);
+# endif
+#endif
+
+	fclose(f);
 
 	return 0;
 }

tests/print_filter.c

@@ -39,23 +39,32 @@ int main(void)
 	cfg_set_print_filter_func(cfg, no_foo);
 	f = fmemopen(buf, sizeof(buf), "w+");
 	fail_unless(f != NULL);
-	cfg_print(cfg, f);
+	fail_unless(cfg_print(cfg, f) == CFG_SUCCESS);
 	fclose(f);
 
+#if defined(__has_feature)
+# if __has_feature(memory_sanitizer)
+	/* Skip check since fmemopen(2) is broken with sanitizers, see
+	 *   https://github.com/google/sanitizers/issues/627
+	 *   https://github.com/google/sanitizers/issues/628
+	 */
+# else
 	fprintf(stderr, "no_foo filter:\n%s", buf);
 	fail_unless(strstr(buf, "foo-") == NULL);
 	fail_unless(strstr(buf, "bar-") != NULL);
 
 	cfg_set_print_filter_func(cfg, no_bar);
 	f = fmemopen(buf, sizeof(buf), "w+");
 	fail_unless(f != NULL);
-	cfg_print(cfg, f);
+	fail_unless(cfg_print(cfg, f) == CFG_SUCCESS);
 	fclose(f);
 
 	fprintf(stderr, "----\n");
 	fprintf(stderr, "no_bar filter:\n%s", buf);
 	fail_unless(strstr(buf, "foo-") != NULL);
 	fail_unless(strstr(buf, "bar-") == NULL);
+# endif
+#endif
 
 	cfg_free(cfg);