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Q106527: FIX: Error in /FILE$INFO/ in FLIB.FI and FLIB.FD

Article: Q106527
Product(s): Microsoft Fortran Compiler
Version(s): 1.0
Operating System(s): 
Keyword(s): 
Last Modified: 24-MAR-2000

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The information in this article applies to:

- Microsoft FORTRAN PowerStation for MS-DOS, version 1.0 
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SYMPTOMS
========

Data corruption may occur after a call to GETFILEINFOQQ due to the NAME field of
/FILE$INFO/ in FLIB.FI and FLIB.FD being declared character*13 instead of
character*255. In some cases the following error:

  run-time error F6316: array already allocated

may be produced.

CAUSE
=====

Page 313 of the FORTRAN PowerStation "Language Guide" shows the structure of
/FILE$INFO/, which is used to return information about the file that matches the
search criteria. The NAME (of file) field is declared as character*255. However,
the NAME field is declared only as character*13 in FLIB.FD and FLIB.FI.
Therefore, using /FILE$INFO/ from FLIB.FD with GETFILEINFOQQ will cause data
corruption because the character*13 field overflows.

RESOLUTION
==========

In F32\INCLUDE\FLIB.FI and F32\INCLUDE\FLIB.FD change

  CHARACTER*13 NAME ! Filename

to the following:

  " CHARACTER*255 NAME ! Filename " (without the quotation marks)

STATUS
======

Microsoft has confirmed this to be a problem in FORTRAN PowerStation version
1.0. This problem was corrected in FORTRAN PowerStation version 1.0a.

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

To demonstrate the problem (before making the above correction):

1. In the Visual Workbench (VWB), build F32\SAMPLES\RUNTIME\RUNTIME.FOR with the
  project in debug mode.

2. Set a breakpoint on line 166:

        length = GETFILEINFOQQ(files, info, handle)

3. "GO" (F5), and then enter "*.FOR" (without the quotation marks) in the "F32
  DEBUG" window.

4. Open the Locals window (choose Locals from the Windows menu). Note the values
  of some integers such as IMIN (should be zero).

5. Single step (F10). Note that IMIN now equals 8224 (hexadecimal 2020).

6. In F32\INCLUDE\FLIB.FI and F32\INCLUDE\FLIB.FD, change NAME from CHARACTER*13
  to CHARACTER*255.

7 Repeat steps 1-5. This time IMIN will remain zero.

Additional query words: 1.00 kbdocerr

======================================================================
Keywords          :  
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword3 kbFORTRANPower100DOS
Version           : :1.0
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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