Bulat Ziganshin wrote:
Simon, are you remember problem with using hTell+hSeek on handles open in text (not binary) mode on Windows? afair, you was finished with the decision to use NoBuffering for text files on Windows?
Not quite - buffering is still used on text files, *unless* the file is opened in ReadWriteMode, in which case we force the buffering to NoBuffering. This is because when used with buffering, ReadWriteMode may need to seek internally. I believe hTell/hSeek will work properly on an output file (hTell forces a flush on Windows). They probably don't work properly with a ReadMode text file.
but this solution is very inefficient. i now thought about dealing with the same problem in my lib and found that there is another solution - prohibit using of hTell/hSeek on files open in text mode (on Unix, too?). i think this is better - one should either open file in binary mode and use random access or open file in text mode and read/write it sequentially. what you think about it?
also, i will be glad to hear comments from other haskellers
The single combination of (hTell + buffering + read mode + text translation) should be disallowed, but I think all other variants can be supported. Cheers, Simon