osd@hou2d.UUCP (Orlando Sotomayor-Diaz) (07/12/85)
From: Orlando Sotomayor-Diaz (The Moderator) <cbosgd!std-c>
mod.std.c Digest Fri, 12 Jul 85 Volume 8 : Issue 7
Today's Topics:
flag to fopen
note on & operator change (2 msgs)
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Date: Thu, 11 Jul 85 23:13:22 edt
From: decvax!minow (Martin Minow)
Subject: flag to fopen
To: std-c@cbosgd
I'm pretty sure I remember seeing such a flag in the current
Draft Standard:
fd = fopen(filename, "rb"); /* read binary */
fd = fopen(filename, "wb"); /* write binary */
There were a few other new flags. Decus C has had such a flag
for 7 years or so (different letter, however). As noted, it
is slightly painful on stdin/stdout. However, in Decus C,
you can do the following:
char filename[256];
fgetname(filename, stdin); /* get name of file on stdin */
freopen(filename, "rb" stdin); /* and force it to binary */
Martin Minow
decvax!minow
PS: here are the fopen flags (from the April 30 draft):
r open text file for reading
w create text file for writing or truncate
a append; open text file or create for writing at end of file
rb open binary file for reading [also wb, ab]
r+ open text file for update [also w+, a+]
r+b open binary file for update [also w+b, a+b]
------------------------------
Date: 6 Jul 85 05:50:48 CDT (Sat)
From: ihnp4!trwrb!desint!geoff
Subject: note on & operator change
To: trwrb!ihnp4!cbosgd!std-c
In article <567@hou2d.UUCP> elsie!ado writes:
>Date: Wed, 19 Jun 85 19:29:25 EDT
>From: seismo!elsie!ado
>Subject: UNIX/WORLD note on & operator change
>
>...allowing the & operator to be applied to
>arrays will NOT allow time_t to be typedefed to an array, since variables of
>type time_t are returned by standard functions (the function "time" in
>particular)--and functions are not allowed to return arrays. Folks interested
>in seeing the problem concretely can run these two lines:
> typedef int time_t[2];
> extern time_t time();
>through their favorite C compiler.
But it's easy to do this:
typedef struct {int timedat[99];} time_t;
extern time_t time ();
(Obviously this requires a compiler that can return structures from functions,
but I believe this is in the standard too.)
--
Geoff Kuenning
...!ihnp4!trwrb!desint!geoff
------------------------------
Date: Thu, 11 Jul 85 10:28:26 EDT
From: seismo!elsie!ado
Subject: note on & operator change
To: std-c@cbosgd, inhp4!trwrb!desint!geoff
> But it's easy to do this:
> typedef struct {int timedat[99];} time_t;
> extern time_t time ();
Indeed it is easy to do the above. And if the above is done, there's no need
to change the language to allow & to be applied to arrays--a change which, as
my first contribution noted, is insufficient to allow time_t to be typedefed to
an array. So: I'd like to see the committee abandon the notion of allowing
& to be applied to arrays.
--ado
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End of mod.std.c Digest - Fri, 12 Jul 85 09:12:11 EDT
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