can "stdio.h" be OS specific at the kernal level or ? i know what I'm
trying to ask here but not sure how to word it :-)
--
Woodzy http://www.rtdos.com/forum
Nov 14 '05
53  4483 
In article <1110313975.c43 093294dde52595a 6a7a3c877c3a48@ teranews>,
\(ProteanThread \) <sy***@rtdos.co m> wrote:
:so "stdio.h" is not the same not only from compiler to compiler but also
:from OS to OS ?
Different from OS to OS for certain.
On unix-type systems that are supplied with <stdio.h> and so on
as part of the OS, most compiler writers try to work within what
is provided. Unix(tm) OS's have to have ANSI-compliant header
files in order to pass the Unix(tm) conformance tests.
Once you get into Windows and so on, you are dealing more with
competing compilers which might use completely different header files.
--
Warning: potentially contains traces of nuts.
In article <1110314389.d45 27d3074cde45f4a ce6396d62a5df4@ teranews>,
\(ProteanThread \) <sy***@rtdos.co m> wrote:
:ok, few more questions:
:1. what's a tyger?
The old spelling of 'tiger'. On old maps, in places unknown and
potentially dangerous, it was supposedly common to put on the map,
"Beyond here be tygers."
:3. is "stdio.h" always necessary in plain C?
No! The C89 standard says in a footnote,
89. A header is not nessisarily a source file [...]
--
Are we *there* yet??
"Walter Roberson" <ro******@ibd.n rc-cnrc.gc.ca> wrote in message
news:d0******** *@canopus.cc.um anitoba.ca...
And where exactly can that charter be found?
comp.lang.c is a rename of a news.* group. It effectively
predates charters. The corresponding news.* group did have a statement
of purpose, but you will, sad to say, get royally roasted if you
post according to that news.* statement of purpose. :(
I wonder if he means "comp.lang.c.mo derated" ?
"Walter Roberson" <ro******@ibd.n rc-cnrc.gc.ca> wrote in message
news:d0******** @canopus.cc.uma nitoba.ca...
You could, but don't expect the result to be portable.
So in order to keep it portable I'd want to keep my own definitions separate
from the standard library ?
Within the last couple of weeks, there was a thread here in comp.lang.c
to the effect that users are "prohibitte d from trying" to redefine
any routine in the standard library. I was the lone holdout for
the interpretation that the standard didn't actually prohibit you
from trying: it just couldn't promise that anything would work
properly if you did.
Well, aren't there a few well used languages that are either a subset of C
or a variation of C ?
"Jonathan Mcdougall" <jo************ ***@DELyahoo.ca > wrote in message
news:Xn******** *************@w agner.videotron .net...
Both. You have to differentiate between the
interface (standard) and the implementation (by
essence not standard). The interface is specified
by the C standard and the implementation is
specified by the compiler.
ok that makes sense.
There are many scenarios but here`s one: the OS
implements low-level functions. You have a C
compiler targeted for your system and it comes
with a standard library. What 'targeted' means is
that its C library makes system calls to your
kernel's low-level functions. Porting that
library to another platform will probably not
work, because it is inherently platform-specific,
as the compiler is.
so really, i'd want to keep the standard C library definitions intact and
just add my own OS specific functions?
The header should be about the same in all
libraries, because it specifies the interface.
But would I want to make "stdio.h" more specific to my OS / Compiler ?
The standard library *must* be implemented for
your platform! It is mandatory for you to
re-implement a working library or to start one
from scratch.
Any examples?
What do you mean exactly? It is necessary if the
program uses declarations from that header.
But can the header be defined to use only functions that pertain to my OS ?
Yes. For example, Visual C++ adds many extensions
to the C++ language. Just make sure you specify
somewhere what is standard and what is not (and
make sure your standard library's implementation
does not use non-standard feature, as Visual C++
does).
Makes sense (but microsoft usually never follows the rules anyways)
By the way, you should remove comp.lang.c from the
crosspost list since your questions have nothing
to do with it (read its charter).
I plan on only using C (or a subset of C) and Assembler for my OS :-)
"Walter Roberson" <ro******@ibd.n rc-cnrc.gc.ca> wrote in message
news:d0******** **@canopus.cc.u manitoba.ca...
The old spelling of 'tiger'. On old maps, in places unknown and
potentially dangerous, it was supposedly common to put on the map,
"Beyond here be tygers."
lol. now i understand the relevance. :-)
:3. is "stdio.h" always necessary in plain C?
No! The C89 standard says in a footnote,
89. A header is not nessisarily a source file [...]
is C89 the last C standard or most recent definition ?
--
Are we *there* yet??
I wish. :-)
Jonathan Mcdougall wrote: (ProteanThread) wrote:
.... snip ...
ok, few more questions:
1. what's a tyger?
Dunno.
It is closely related to a tigger (spelled with a double guh) and
specifies a striped yet powerful mythical beast that is sometimes
friendly. Cartologists have been known to specify areas where
"Here there be tygers". Cartoonists and illustrators tend to lean
towards tiggers. The C standard stands aloof in the matter and
allows you to redefine both flavors.
--
Chuck F (cb********@yah oo.com) (cb********@wor ldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home .att.net> USE worldnet address!
In article <1110320853.164 b2acfba50312e86 5d1735f8b3c98a@ teranews>,
\(ProteanThread \) <sy***@rtdos.co m> wrote:
:So in order to keep it portable I'd want to keep my own definitions separate
:from the standard library ?
Right. But I'm not sure how you intend to impliment a portable
operating system? I/O is always going to be platform dependant.
:Well, aren't there a few well used languages that are either a subset of C
:or a variation of C ?
Subset? I can't think of any.
Variation? Some people would consider C++, C#, and Java to be
"variations " on C.
If you are trying to find a language that says, "It's okay to
redefine the system library routines," then the only one I can think
of at the moment is Forth. LISP and Scheme too maybe.
--
"No one has the right to destroy another person's belief by
demanding empirical evidence." -- Ann Landers
In article <1110321509.874 f748acd8c835cd7 95a4a9d0a5dfd1@ teranews>,
\(ProteanThread \) <sy***@rtdos.co m> wrote:
:is C89 the last C standard or most recent definition ?
There is a 1999 international C standard. There are, though,
not a great number of compilers built for that standard yet.
--
"I want to make sure [a user] can't get through ... an online
experience without hitting a Microsoft ad"
-- Steve Ballmer [Microsoft Chief Executive]
On Tue, 8 Mar 2005 13:34:09 -0700, in comp.lang.c , "\(ProteanThrea d\)"
<sy***@rtdos.co m> wrote:
"Minti" <im*******@gmai l.com> wrote in message
news:11******* *************** @f14g2000cwb.go oglegroups.com. .. Sorry, could you try to reword your post. I am quite sure many would
like to answer your question.
sorry, what I mean is "stdio.h" compiler dependent or OS dependent?
both.
or can I create my own "stdio.h" lib for my own OS ?
Of course
--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt >
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