Date: Wed, 22 Dec 2004 20:08:55 +1100 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: "Greg 'groggy' Lehey" <grog@freebsd.org> Cc: FreeBSD Architecture Mailing List <arch@freebsd.org> Subject: Re: Header files with enums instead of defines? Message-ID: <20041222090855.GO79646@cirb503493.alcatel.com.au> In-Reply-To: <20041222010143.GS53357@wantadilla.lemis.com> References: <20041222010143.GS53357@wantadilla.lemis.com>
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On Wed, 2004-Dec-22 11:31:43 +1030, Greg 'groggy' Lehey wrote:
>Has anybody thought about replacing #defines with enums in header
>files? It would make debugging a whole lot easier. Foe example, I'm
>currently looking at a debug printout which contains:
>
> xerrno = 17,
...
> xerrno = EEXIST,
K&R2 states that errno is an "integer expression" and that the error
values are "macros". I suspect POSIX and newer C standards say something
similar. Also, the enum value name replacement would only occur if xerrno
was of the appropriate enum type - which would make the code non-portable.
An alternative suggestion for you: Write a gdb macro which takes an
int and prints it as an errno. Something like a shorthand version of:
print (enum { EPERM=1, ENOENT=2, ..., EILSEQ=86})xerrno
should work.
You would probably write a [insert scripting language of choice] script
to convert <errno.h> into the appropriate gdb macro.
--
Peter Jeremy
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