read CSV data consistently from string or file

[Jerry DeLisle]

On 10/12/18 4:52 PM, Jerry DeLisle wrote:
> On 10/12/18 1:10 PM, Browning, Robert S IV ERDC-RDE-GSL-MS CIV wrote:
>> I am needing to read in a text file that contains numerical data 
>> separated by keywords. Because of the keywords, I need to read each 
>> line in as text first and test if it’s a keyword, and then call the 
>> appropriate subroutine based on the keyword value. Within the 
>> subroutines I also need to read each line as text first so I can stop 
>> the subroutine when the next keyword is found.
>> The numerical data can be in either fixed format or 
>> comma-separated-value (CSV) format. In the CSV data, a zero could be 
>> represented by a pair of commas with no number between them.
>> The issue I have encountered is that the read statement appears to 
>> behave differently when it is reading from a character string than 
>> when it is reading directly from the input file. If I were able to 
>> read directly from the input file, then a simple formatted read 
>> statement does everything I need. But if I am reading from a string, 
>> then things get a bit more complicated.
> 
> Hi Robert,
> 
> This may be a known bug. It sounds familiar. Let me do some checking.
> 
> Fortranners, if I confirm this is the bug I think it is, I think I can 
> squeeze some time to fix it.
> 
> Jerry
> 

I am fairly certain this is PR78351. As far as we can tell the code is 
non-conforming Fortran but the use of comma to terminate a read has been 
around forever and gfortran supported this before.  It was my breakage 
in my endeavors to improve string I/O performance. I feel obligated at 
this point to set it straight.

Jerry