Q171543: FIX: _getmbp CRT Function Does Not Return Correct Value

Article: Q171543
Product(s): Microsoft C Compiler
Version(s): WINNT:5.0sp1,5.0sp2,97,97sp1,97sp2
Operating System(s): 
Keyword(s): kbCRT kbVC500bug kbVS97bug kbVS97sp1bug kbVS97sp1fix kbVS97sp2bug kbVS97sp2fix
Last Modified: 17-JUL-2001

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The information in this article applies to:

- The C Run-Time (CRT), included with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0sp1 
   - Microsoft Visual C++, 32-bit Professional Edition, version 5.0sp1 
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0sp2 
   - Microsoft Visual C++, 32-bit Professional Edition, version 5.0sp2 
   - Microsoft Visual Studio versions 97, 97sp1, 97sp2 
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SYMPTOMS
========

The C Run-time (CRT) Library function _getmbcp is supposed to return 0 if a
single-byte code page is in use. However, this is not true with the CRT Library
shipped with Visual C++ 5.0 in Visual Studio 97 Service Pack 1 and Service Pack
2. The function returns the current code page value irrespective of whether it
is a single byte or multi byte code page. This behavior breaks existing programs
that were using this call primarily to query whether a single-byte code page is
active.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This bug has been fixed in Visual Studio 97 Service
Pack 3.

For additional information about , please click the article number(s) below to
view the article(s) in the Microsoft Knowledge Base:

  Q170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

MORE INFORMATION
================

The following sample program demonstrates the bug:

  //sample.cpp
  /* Compiler options: none */ 
  #include <mbctype.h>
  #include <stdio.h>

  main()
  {
    printf("The return value from _getmbcp is= %d \n", _getmbcp());
    return 0;
  }

Additional query words:

======================================================================
Keywords          : kbCRT kbVC500bug kbVS97bug kbVS97sp1bug kbVS97sp1fix kbVS97sp2bug kbVS97sp2fix 
Technology        : kbVCsearch kbAudDeveloper kbCRT
Version           : WINNT:5.0sp1,5.0sp2,97,97sp1,97sp2
Issue type        : kbbug
Solution Type     : kbfix

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