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- From: Orlando Sotomayor-Diaz (The Moderator) <cbosgd!std-c>
-
-
- mod.std.c Digest Wed, 10 Jul 85 Volume 8 : Issue 5
-
- Today's Topics:
- flag to fopen (2 msgs)
- ----------------------------------------------------------------------
-
- Date: Thu, 4 Jul 85 13:11:14 mst
- From: ihnp4!arizona!wendt (Alan Wendt)
- Subject: flag to fopen
- To: ihnp4!cbosgd!std-c, wendt
-
- > Every C compiler for another operating system has had to implement
- > a flag to fopen where the application programmer specifies whether
- > the file is a text file or a binary file.
-
- I prefer a call which can be made on a file descriptor to do such a
- declaration. This call (ie "texfile(&stdout)") can be embedded inside
- printf and other places and then most applications can run unchanged.
-
- Moreover, this method allows standard input and output to be either
- text or binary, whereas requiring the flag on fopen pretty much
- forces standard I/O files to be text.
-
- Moreover, consider maintaining a program that is to run on CP/M and UNIX.
- If fopen takes unique flags I have to conditionally compile every
- fopen call. With a separate function call I simply define a null
- function for UNIX and I don't have to conditionally compile anything
- except that function (even if printf does no textfile calls).
-
- Alan Wendt
- arizona!wendt
-
- ------------------------------
-
- Date: Tue, 9 Jul 85 15:11:03 edt
- From: mark@cbosgd.ATT.UUCP (Mark Horton)
- Subject: flag to fopen
- To: arizona!wendt@ihnp4.uucp, osd@hou2d.uucp
-
- I was not recommending a particular way of doing it, just pointing
- out the need for the application to communicate to the implementation
- whether the file is text or not. A modifier would probably do OK,
- unless some presentation protocol had to be negotiated at fopen time
- over a network connection. Presumably on UNIX there might be some
- way to communicate this to the raw file descriptor (e.g. an ioctl)
- if the presentation layer is in the kernel (which it may be with
- System V streams.) Your point about stdout assuming text is quite
- valid, I can only observe that that's the way most micro implementations
- seem to handle it today, perhaps they wanted to avoid another function.
- In any case, standardizing the method would be a win.
-
- Mark
-
- ------------------------------
-
- End of mod.std.c Digest - Wed, 10 Jul 85 19:30:10 EDT
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