Article ID: 80237
Article Last Modified on 12/1/2003
APPLIES TO
- Microsoft FORTRAN Compiler 5.0
- Microsoft FORTRAN Compiler 5.1
- Microsoft FORTRAN Compiler 5.0
- Microsoft FORTRAN Compiler 5.1
This article was previously published under Q80237
SYMPTOMS
When the following conditions are met
- Output is placed in a record position that is beyond the number of bytes held by the I/O buffer.
- The FORMAT edit descriptor tabs back to a position that is within the number of bytes held by the I/O buffer.
- Output is written on top of the existing output that is immediately after the I/O buffer boundary.
the initial data that was output prior to the backwards tab will not be overwritten by the new output. This will only occur with output immediately following the I/O buffer boundary.
RESOLUTION
Since it is difficult to determine if a tab operation is going to cross an I/O buffer boundary, it is best to avoid tabbing back behind and overwriting existing output in a record. If the size of the I/O buffer is increased to a larger number, there will be fewer buffer boundaries and the probability of encountering this problem will be decreased.
STATUS
Microsoft has confirmed this to be a bug in the products listed above. This problem was corrected in FORTRAN PowerStation, version 1.0.
MORE INFORMATION
The following code can be used to reproduce the problem:
Sample code
open(1,file='test.dat',blocksize=1024)
write(1,10) '@@@@@@@@@@@@@@',123,456,789
10 format(1024x,a,t1010,3i10)
end
Output (at end of file test.dat):
123 @@@ 789
Additional query words: 5.10 buglist5.10 fixlist1.00
Keywords: kbfix KB80237
