Macro to indicate directories in filenames

[raphfrk]

I was wondering if there is a standard macro that will evaluate to the
directory separator character in the OS that the compiler is
targeting.

For example, in UNIX, it would be / while in windows it would be \

A filename could then be built up using

sprintf( filename , "directory%sfil ename", MACRO );

Alternatively, is there a clean way to do it ?

[Ian Collins]

Re: Macro to indicate directories in filenames

raphfrk wrote:

I was wondering if there is a standard macro that will evaluate to the
directory separator character in the OS that the compiler is
targeting.
>
For example, in UNIX, it would be / while in windows it would be \
>
A filename could then be built up using
>
sprintf( filename , "directory%sfil ename", MACRO );
>
Alternatively, is there a clean way to do it ?

Yes, use '/', windows compilers accept both forms.

--
Ian Collins.

[Richard Heathfield]

Re: Macro to indicate directories in filenames

raphfrk said:

I was wondering if there is a standard macro that will evaluate to the
directory separator character in the OS that the compiler is
targeting.

There isn't, for the very simple reason that the Standard doesn't
acknowledge the existence of directories. (Some systems really, truly,
honestly don't have them. They have other ways of organising files.)

For example, in UNIX, it would be / while in windows it would be \
>
A filename could then be built up using
>
sprintf( filename , "directory%sfil ename", MACRO );
>
Alternatively, is there a clean way to do it ?

If your targets are Windows and Unix, just use the / separator - it works
fine on both. (It doesn't actually work on the Windows command line for
ordinary "DOS"-style commands, but it works just fine within a C program.)

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[raphfrk]

Re: Macro to indicate directories in filenames

On Mar 28, 10:59 pm, Richard Heathfield <r...@see.sig.i nvalidwrote:

Alternatively, is there a clean way to do it ?

>
If your targets are Windows and Unix, just use the / separator

cool, thanks

[Mark McIntyre]

Re: Macro to indicate directories in filenames

raphfrk wrote:

I was wondering if there is a standard macro that will evaluate to the
directory separator character in the OS that the compiler is
targeting.

Not possible. Consider that VMS uses the form

server::disk:[000000.dir1.dir 2]filename.ext;ve rsion

and other OSen use even more amusing variants.

For windows and *nix, as others have pointed out, "/" is fine, windows
only pretends not to like /.

--
Mark McIntyre

CLC FAQ <http://c-faq.com/>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt >

[Eric Sosman]

Re: Macro to indicate directories in filenames

raphfrk wrote:

I was wondering if there is a standard macro that will evaluate to the
directory separator character in the OS that the compiler is
targeting.
>
For example, in UNIX, it would be / while in windows it would be \
>
A filename could then be built up using
>
sprintf( filename , "directory%sfil ename", MACRO );
>
Alternatively, is there a clean way to do it ?

Anything that can produce

SYS$DISK:<rootd ir.>[topdir.director y]filename.ext;-1

suffices.

--
Eric Sosman
esosman@ieee-dot-org.invalid

[Joe Wright]

Re: Macro to indicate directories in filenames

Mark McIntyre wrote:

raphfrk wrote:

>I was wondering if there is a standard macro that will evaluate to the
>directory separator character in the OS that the compiler is
>targeting.

>
Not possible. Consider that VMS uses the form
>
server::disk:[000000.dir1.dir 2]filename.ext;ve rsion
>
and other OSen use even more amusing variants.
>
For windows and *nix, as others have pointed out, "/" is fine, windows
only pretends not to like /.
>

It is the Windows command processors, command.com and cmd.exe which
demand '\' separators. The OS as far back as MSDOS 2.0 I think, is quite
happy with the '/' separator.

--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---

[Keith Thompson]

Re: Macro to indicate directories in filenames

Ian Collins <ian-news@hotmail.co mwrites:

raphfrk wrote:

>I was wondering if there is a standard macro that will evaluate to the
>directory separator character in the OS that the compiler is
>targeting.
>>
>For example, in UNIX, it would be / while in windows it would be \
>>
>A filename could then be built up using
>>
>sprintf( filename , "directory%sfil ename", MACRO );
>>
>Alternativel y, is there a clean way to do it ?

>
Yes, use '/', windows compilers accept both forms.

<OT>
If you're using it to open a file, it's probably ok. If you intend to
display it to a user, possibly a Windows user who's not aware of this
particular hidden feature of Windows, you might want to consider
going to some extra effort to use '\\'.
</OT>

--
Keith Thompson (The_Other_Keit h) <kst-u@mib.org>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[Antoninus Twink]

Re: Macro to indicate directories in filenames

On 29 Mar 2008 at 0:29, Joe Wright wrote:

Mark McIntyre wrote:

>raphfrk wrote:

>>I was wondering if there is a standard macro that will evaluate to the
>>directory separator character in the OS that the compiler is
>>targeting.

>>
>Not possible. Consider that VMS uses the form
>>
> server::disk:[000000.dir1.dir 2]filename.ext;ve rsion
>>
>and other OSen use even more amusing variants.
>>
>For windows and *nix, as others have pointed out, "/" is fine, windows
>only pretends not to like /.
>>

It is the Windows command processors, command.com and cmd.exe which
demand '\' separators. The OS as far back as MSDOS 2.0 I think, is quite
happy with the '/' separator.

That must be useful for CBF then - I think he's upgraded to MSDOS 2.0
now, hasn't he?