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extern/stdcxx/4.2.1/tests/regress/18.limits.stdcxx-436.cpp

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+/************************************************************************
+ *
+ * 18.limits.stdcxx-436.cpp - test case from STDCXX-436 issue
+ *
+ * $Id: 18.limits.stdcxx-436.cpp 580483 2007-09-28 20:55:52Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  "License"); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ * 
+ **************************************************************************/
+
+#include <assert.h>  // for assert()
+#include <limits.h>  // for MB_LEN_MAX
+
+// tell Compaq C++ we need the declaration of the POSIX popen() function
+// that's guarded (not declared) in the compiler's pure C++ libc headers
+#undef __PURE_CNAME
+#include <stdio.h>   // for popen(), fscanf(), pclose(), ...
+
+#if defined(_WIN32) || defined(_WIN64)
+#  define popen  _popen
+#  define pclose _pclose
+#endif  // defined(_WIN32) || defined(_WIN64)
+
+int main ()
+{
+    // assumes getconf is in the path. on most unix systems it is in
+    // '/usr/bin' and it doesn't exist on most win32 configurations,
+    // yet somehow this appears to work on windows, but not sure how.
+
+    FILE* f = popen ("getconf MB_LEN_MAX", "r");
+    if (f) {
+
+        int mb_len_max = -1;
+
+        const bool failed = fscanf (f, "%d", &mb_len_max) != 1;
+
+        pclose (f);
+
+        // if getconf isn't available, or getconf doesn't know the limit
+        // the scan will fail, so we must handle both situations.
+        assert (failed || MB_LEN_MAX == mb_len_max);
+    }
+
+    return 0;
+}