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